WO2011114881A1 - Digital broadcast reception device provided with function of displaying multiple screens - Google Patents

Digital broadcast reception device provided with function of displaying multiple screens Download PDF

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Publication number
WO2011114881A1
WO2011114881A1 PCT/JP2011/054720 JP2011054720W WO2011114881A1 WO 2011114881 A1 WO2011114881 A1 WO 2011114881A1 JP 2011054720 W JP2011054720 W JP 2011054720W WO 2011114881 A1 WO2011114881 A1 WO 2011114881A1
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WO
WIPO (PCT)
Prior art keywords
digital broadcast
display
video
unit
broadcast signal
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PCT/JP2011/054720
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French (fr)
Japanese (ja)
Inventor
博 下山田
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シャープ株式会社
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Publication of WO2011114881A1 publication Critical patent/WO2011114881A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H04N21/4314—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for fitting data in a restricted space on the screen, e.g. EPG data in a rectangular grid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H04N21/4316—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/440263—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the spatial resolution, e.g. for displaying on a connected PDA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications

Definitions

  • the present invention relates to a digital broadcast receiving apparatus having a function of displaying a plurality of screens.
  • Patent Document 1 discloses a display device having such a two-screen display function.
  • This display device detects the presence or absence of a synchronization signal of each video signal input from a first receiving system (also referred to as an input system) and a second receiving system, and inputs each from both the first and second receiving systems.
  • a first receiving system also referred to as an input system
  • a second receiving system inputs each from both the first and second receiving systems.
  • the synchronization signal of the video signal is detected, the video of the video signal input from both receiving systems is displayed on two screens on one display panel.
  • the video of the video signal input from the reception system detecting the synchronization signal is displayed on one display panel.
  • One screen is displayed.
  • VHF band analog television frequency band
  • ISDB-Tmm VHF-H band
  • ISDB-T Integrated Services Digital Broadcasting
  • Tsb VHF-L band
  • Patent Document 1 describes that the display device automatically switches between the two-screen display and the one-screen display by detecting the synchronization signal of the video signal. .
  • the location where the synchronization signal of the video signal can be received and the location where the synchronization signal cannot be received are frequently moved. Switching between the two-screen display and the one-screen display is frequently performed, which may cause discomfort to the viewing user.
  • ISDB-T two types of video images broadcast in different broadcasting systems
  • ISDB-Tsb two types of video images broadcast in different broadcasting systems
  • the broadcasting format ISDB- This is a case where the Tsb moving image becomes a still image and the state continues. Unlike a moving image, the user only has to view this still image for a certain period of time, and there is little need for continuous viewing. Even in such a case, the two-screen display is continued.
  • the present invention has been made in view of such a situation, and is provided with a multi-screen display function for displaying a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of receiving systems on a single display unit.
  • a broadcast receiving apparatus when an image is not visible or there is no information to be viewed, a digital broadcast receiving apparatus that selects a video to be displayed based on the broadcast content and the reception quality of a digital broadcast signal and appropriately performs screen switching processing The purpose is to provide.
  • the first technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit.
  • a digital broadcast receiver characterized by controlling a display area.
  • the second technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit.
  • a display control unit, and a detection unit that detects presence / absence of a video signal in the digital broadcast signal being received based on a table in which the presence / absence information of the video signal included in the digital broadcast signal is recorded, and the display control unit
  • the digital broadcast receiving apparatus is characterized in that the number of images displayed on the display unit and the display area are controlled by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detecting unit.
  • the detection unit further determines whether the video of the digital broadcast signal is a moving image, caption information, or a still image (including / not including caption).
  • the display control unit detects that the video of the video signal included in the digital broadcast signal being received is the subtitle information or the still image for a certain period of time. After the elapse of time, the video display processing of the subtitle information or the still image is stopped, and the video of the moving image being displayed is enlarged and displayed on the display unit.
  • the detection unit further stores the video signal of the still image in a memory, and the video signal of the still image stored in the memory
  • the display control unit when the detection unit detects a difference in the video signal of the still image, displays the enlarged image in a reduced size and performs still image display processing. It is characterized by restarting.
  • a fifth technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit.
  • a display control unit, and a detection unit that detects a reception quality value of the digital broadcast signal being received based on any one of the CN value, RSSI value, bit error rate, and the like of the received digital broadcast signal,
  • the display control unit controls a display number and a display area of video on the display unit based on a reception quality value of a digital broadcast signal being received detected by the detection unit. It is.
  • the digital broadcast signal receiving device includes a memory for storing the reception quality value of the digital broadcast signal with a time interval, and the detection unit is stored in the memory.
  • the average value of the reception quality values is the reception quality value of the digital broadcast signal.
  • a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on one display unit, when an image is not visible or information to be viewed is present. If there is no such information (the state where new information cannot be obtained even if the user continues to view the screen), the display of such a screen can be terminated.
  • the CN value C / N value: Carrier to Since a video to be displayed is selected based on information indicating the reception quality of a digital broadcast signal such as “Noise ratio” and the screen switching process is appropriately performed, the user can view the optimal video.
  • FIG. 1 is a functional block diagram of a digital broadcast receiving apparatus according to the present invention.
  • the digital broadcast receiver 1 is mounted on a mobile phone 2.
  • the mobile phone 2 is an example, and for example, the digital broadcast receiving device 1 may be mounted on a portable electronic device or a vehicle-mounted electronic device.
  • the digital broadcast receiver 1 includes an antenna X101, an antenna Y102, an antenna switching unit 103, a tuner X104, a tuner Y105, a multimedia decoder X106, a multimedia decoder Y107, a display control unit 108, an audio switching unit 109, a broadcast reception control unit 110, A timer 111 and a memory 112 are provided.
  • the antenna X101 is an antenna used for ISDB-Tsb broadcast reception, for example, and is composed of a broadcast wave receiving earphone antenna that can be attached to and detached from the digital broadcast receiving apparatus 1.
  • the antenna Y102 is, for example, an antenna used for ISDB-T (one-segment) broadcast reception, and is composed of a built-in antenna built in the digital broadcast receiving apparatus 1.
  • the antenna switching unit 103 selects whether the digital broadcast signal output to the tuner X104 or the tuner Y105 is acquired from the antenna X101 or the antenna Y102, and uses it according to the selection result. Switch the antenna.
  • the tuner X104 demodulates a digital broadcast signal transmitted by both the ISDB-T and ISDB-Tsb broadcast systems to obtain a TS (Transport Stream). Then, this TS is output to the multimedia decoder X106. Similarly to the tuner X104, the tuner Y105 outputs TS to the multimedia decoder Y107.
  • the multimedia decoder X106 decodes TS included in the digital broadcast signal transmitted by both the ISDB-T and ISDB-Tsb broadcasting systems, and obtains a video signal / audio signal from the TS output from the tuner X104. Then, this video signal is output to the display control unit 108, and this audio signal is output to the audio switching unit 109.
  • the multimedia decoder Y107 also obtains a video signal / audio signal from the TS, outputs this video signal to the display control unit 108, and outputs this audio signal to the audio switching unit 109.
  • the display control unit 108 based on the control of the broadcast reception control unit 110, performs a one-screen display process for displaying the video signal input from the multimedia decoder X106 or Y107, and the video input from the multimedia decoder X106 and Y107.
  • a two-screen display process for displaying the video of the signal is executed.
  • the display control unit 108 enlarges the display area of each video by 4/3 times, and displays the video of the video signal input from the multimedia decoder X106 on the left side of the display unit 202.
  • the video of the video signal input from the multimedia decoder Y107 is displayed on the right side of the display unit 202.
  • the display control unit 108 controls the display number and display area of the video on the display unit 202 by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detection unit 110a of the broadcast reception control unit 110 described later. To do. Details of this control process will be described later.
  • the audio switching unit 109 selects one of the audio signals input from the multimedia decoder X106 and the multimedia decoder Y107 under the control of the broadcast reception control unit 110, and outputs the selected audio signal to the speaker 208.
  • the broadcast reception control unit 110 controls various processes related to the digital broadcast signal reception process. For example, the broadcast reception control unit 110 controls the antenna switching unit 103 to execute control for switching the antennas X101 and Y102 connected to the tuners X104 and Y105. The broadcast reception control unit 110 also performs operation control of the tuners X104 and Y105 and the multimedia decoders X106 and Y107. In particular, the broadcast reception control unit 110 instructs the multimedia decoders X106 and Y107 to specify PID (Packet IDentity) of PSI (Program Specific Information) / SI (Service Information) to be analyzed, and the packet output by the multimedia decoder Build and analyze sections from
  • PID Packet IDentity
  • PSI Program Specific Information
  • SI Service Information
  • the broadcast reception control unit 110 causes the display control unit 108 to perform a display screen switching process from a one-screen display to a two-screen display, which will be described later, or a display screen switching process from a two-screen display to a one-screen display (hereinafter referred to as “display screen switching process”). , Abbreviated as display screen switching processing).
  • the broadcast reception control unit 110 gives an instruction regarding the enlargement / reduction ratio, display / non-display, and display position of the video that the display control unit 108 controls to display.
  • the detecting unit 110a detects the presence / absence of a video signal in the digital broadcast signal being received based on a table in which the presence / absence information of the video signal included in the digital broadcast signal is recorded.
  • This table is, for example, a PMT.
  • the PMT is a table included in the number of programs in the MPEG2TS of the digital broadcast signal, and is configured as an MPEG2 section.
  • the PMT a program number used for program identification, additional information on the program, and information on ES (Elementary Stream) belonging to the program are recorded. That is, the PMT records PIDs such as video and audio included in the program together with a number called a PMT stream format type.
  • the detection unit 110a can detect the presence / absence of the video ES in the TS, that is, the presence / absence of the video signal in the digital broadcast signal, by referring to the number called the PMT stream format type.
  • the detection unit 110a is a determination unit that determines whether information such as a new image can be obtained from a digital broadcast signal being received based on a table in which presence / absence information of a video signal is recorded.
  • the display control unit 108 controls the display number and display area of the video on the display unit 202 by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detection unit 110a. For example, when the detection unit 110a detects a digital broadcast signal without a video signal from the digital broadcast signals being received, the display control unit 108 displays a plurality of videos on the display unit 202. The video display processing corresponding to the digital broadcast signal that does not exist is stopped, and the video corresponding to the digital broadcast signal including the video signal is enlarged and displayed on the display unit 202.
  • the timer 111 supplies timer resources necessary for broadcast reception processing by the broadcast reception control unit 110.
  • the present invention exemplifies a case where two-screen display is continued for a certain period of time or when it is necessary to acquire information from the tuner every certain period of time. This is realized by setting a desired value for.
  • the memory 112 is a storage unit that stores various control information and the like.
  • the mobile phone 2 includes a key input unit 201, a display unit 202, an antenna Z203, a radio unit 204, a communication function control unit 205, a voice decoding unit 206, a voice encoding unit 207, a speaker 208, and a microphone 209.
  • the key input unit 201 includes operation keys, detects a user's key operation, and outputs the detection result to the broadcast reception control unit 110.
  • the display unit 202 is configured by a liquid crystal panel or the like, and displays a video signal image, an operation screen, and the like included in the digital broadcast signal.
  • the antenna Z 203 is an antenna for mobile phone communication, and the wireless unit 204 executes various wireless communication processes related to mobile phone communication, and outputs a received voice signal to the communication function control unit 205.
  • the communication function control unit 205 controls various communication processes related to the mobile phone communication process.
  • the communication function control unit 205 outputs the audio signal input from the radio unit 204 to the audio decoding unit 206 and outputs the audio signal input from the audio encoding unit 207 to the radio unit 204.
  • the audio decoding unit 206 decodes the received audio signal input from the communication function control unit 205 and outputs it to the speaker 208.
  • the audio encoding unit 207 encodes an audio signal input from the microphone 209 during a call and outputs the encoded audio signal to the communication function control unit 205.
  • the display screen switching process executed in the digital broadcast receiving apparatus 1 will be described with reference to the flowchart of FIG.
  • a series of processing composed of digital broadcast signal reception processing and demodulation processing by the tuner X104 and multimedia decoder X106, and various processing for video signals and audio signals included in the demodulated digital broadcast signals.
  • This system is called the first receiving system, and is composed of digital broadcast signal reception processing and demodulation processing by the tuner Y105 and multimedia decoder Y107, and various processing for video signals and audio signals included in the demodulated digital broadcast signals.
  • a series of processing systems are referred to as a second receiving system.
  • the user uses the digital broadcast receiving device 1 to view the video (also referred to as service) corresponding to the digital broadcast signal transmitted by the ISDB-T (One Seg) system in the first reception system, and receive the second reception.
  • video also referred to as service
  • ISDB-T One Seg
  • a video corresponding to a digital broadcast signal transmitted by the ISDB-Tsb system is being watched.
  • the present invention is not limited to the combination of the broadcast formats, and for example, a digital broadcast signal transmitted by the ISDB-Tsb method may be received by the first reception system.
  • the service being viewed in the first receiving system is referred to as service 1
  • service being viewed in the second receiving system is referred to as service 2.
  • the display control unit 108 of the digital broadcast receiving apparatus 1 displays two videos corresponding to two digital broadcast signals input from the first reception system and the second reception system on the display unit 202. .
  • step S1 the detection unit 110a monitors the PMT included in the digital broadcast signal input from the first reception system and the second reception system.
  • the case where the video signal is no longer included in the ISDB-Tsb format digital broadcast signal input from the second receiving system will be described as an example.
  • information indicating that there is no video signal in the digital broadcast signal is newly recorded in the PMT included in the digital broadcast signal input from the second receiving system, and the PMT is updated.
  • the broadcast reception control unit 110 receives PMT packets from the multimedia decoders X106 and Y107. Then, the broadcast reception control unit 110 builds and analyzes the PMT section of the PMT packet. Based on the PMT analyzed by the broadcast reception control unit 110, the detection unit 110a detects the presence / absence of a video signal in a digital broadcast signal including the PMT (step S3).
  • step S3 detects that there is no video signal in the digital broadcast signal including the PMT (step S3 / detects a digital broadcast signal without a video signal), whether or not the display control unit 108 is executing a two-screen display process. Is determined (step S4).
  • the display control unit 108 stops the video display processing corresponding to the digital broadcast signal having no video signal (step S5), and converts the digital broadcast signal having the video signal.
  • the corresponding video is enlarged and displayed on the display unit 202 (step S6). That is, the display control unit 108 controls the display number of the video on the display unit 202 to 1 and enlarges the display area of the video to be displayed.
  • step S7 / YES the broadcast reception control unit 110 ends all the processes.
  • step S7 / NO the process returns to step S1.
  • the detection unit 110a detects that the digital broadcast signal that has lost the video signal has the video signal again. Then (step S3 / detecting a digital broadcast signal having a video signal), the detection unit 110a determines whether or not the display control unit 108 is executing a two-screen display process (step S8).
  • the display control unit 108 enlarges the video (step S6).
  • the service 1) is reduced and displayed (step S9), and the display processing of the video (service 2) corresponding to the digital broadcast signal having the video signal is started (step S10). That is, the display control unit 108 controls the display number of the video on the display unit 202 to 2 and controls the video display area so that two videos are displayed in the display unit 202.
  • the PMT update of service 1 (ISDB-T (one seg)) is not mentioned, but in the case of one seg, the video component is unlikely to disappear, so this case is ignored.
  • the digital broadcast signal received by the first reception system and the second reception system is the ISDB-Tsb system
  • the broadcast reception control unit 110 instructs the display control unit 108 to stop video display corresponding to both digital broadcast signals.
  • the display unit 202 is an LCD, the backlight can be turned off, and excessive power consumption can be suppressed.
  • the broadcast reception control unit 110 controls the audio switching unit 109 based on an instruction given by the user through the key input unit 201, and which audio of the service 1 or service 2 is presented to the user. decide.
  • the video signal disappears, and for example, by stopping the video display processing of the digital broadcast signal including only the audio signal, the video of the digital broadcast signal having the video signal can be enlarged and displayed. Can be comfortably viewed.
  • the detection unit 110a further includes a function of detecting whether the video of the digital broadcast signal is a moving image or caption information / still image (including / not including caption).
  • This subtitle is a character supermarket composed of character information such as news and program information.
  • the still image may include not only a still image such as a landscape image or a person image (not including subtitles) but also a subtitle (including subtitles).
  • Various methods can be adopted as a method for detecting whether the image is a moving image or a still image. The detection of caption information will be described later.
  • the detection unit 110a refers to the description content of the video decoding control descriptor of the PMT.
  • still_picture_flag described in the PMT video decode control descriptor is 1.
  • the detection unit 110a may notify the broadcast reception control unit 110 that the multimedia decoders X106 and Y107 analyze the format and data content of the input video data and that the broadcast reception control unit 110 is a still image.
  • the detection unit 110a stores, in a memory within the multimedia decoders X106 and Y107, each pixel data of a still image video signal obtained as a result of video decoding, for example, 320 ⁇ 180 bitmap data, for a predetermined time (several seconds to several seconds). 10 seconds) and remember. And the detection part 110a may detect the difference of the pixel data of the two bitmap data memorize
  • This detection unit 110a determines whether or not information such as a new image can be obtained from the digital broadcast signal being received, whether the video of the digital broadcast signal is a moving image, caption information / still image (including / not including caption) It is a judgment part which judges by detecting.
  • the display control unit 108 displays a plurality of videos on the display unit 202 for a certain period of time. After the elapse of time, the video display processing of the still image is stopped and the video of the moving image is enlarged and displayed on the display unit 202.
  • This fixed time is a time sufficient for a user to obtain information from a still image for several seconds to several tens of seconds. In this case, the video display processing of the still image is stopped, and the reception of the digital broadcast signal is continued.
  • steps S11 to S17 are the same as those of steps S1 to S7 of FIG. 2, and in the flowchart of FIG. 4, the processes of steps S22 and S23 are the same as steps S9 and S9 of FIG. Since it is the same as S10, its description is omitted.
  • the detection unit 110a detects that the PMT has been updated (step S12 / YES), and further detects that there is a video signal in the digital broadcast signal including the PMT (step S13 / digital broadcast signal having the video signal). It is determined whether or not the video of the video signal is a still image (step S18).
  • step S18 / YES the detection unit 110a determines whether two screens are being displayed (step S19). If two screens are being displayed (step S19 / YES), the display control unit 108 stops the still image display process after a predetermined time has elapsed (step S20), and proceeds to step S16.
  • step S21 determines whether or not two screens are being displayed.
  • step S21 / YES determines whether or not two screens are being displayed.
  • step S17 determines whether or not two screens are being displayed.
  • the still image display processing is stopped, and the moving image is displayed in an enlarged manner, thereby providing a better viewing environment for the user.
  • the display control unit 108 may restart the still image display process based on a key operation from the user while the still image display process is stopped. It goes without saying that the above processing can also be applied to the case of two-screen display of a moving image and a still image from the beginning.
  • the digital broadcast receiving apparatus 1 displays the contents of the updated still image.
  • the detection unit 110a further has a function of detecting whether or not a still image has been updated.
  • the detection unit 110a obtains a 320 ⁇ 180 bitmap obtained as a result of video decoding in the memory in the multimedia decoders X106 and Y107.
  • Each pixel data of the data is stored after a certain time, and the difference between the pixel data of two bitmap data stored after a certain time is detected, and if there is a difference, the still image is updated. There is a way to judge.
  • the display control unit 108 displays the enlarged video in a reduced size and restarts the still image video display process. .
  • FIG. 5 is a flowchart for explaining such display screen switching processing.
  • the detection unit 110a monitors whether a still image whose display is stopped has been updated. When it is detected that the still image has been updated (step S32 / YES), it is next determined whether or not two screens are being displayed (step S33).
  • the display control unit 108 displays the displayed video image.
  • the reduced image is displayed (step S34), and the still image display process is started (step S35).
  • the display control unit 108 stops the still image display processing after a predetermined time has elapsed (step S36), and enlarges and displays the moving image being displayed (step S37).
  • the digital broadcast signal including the still image video signal may newly include subtitle information (also referred to as text super) such as extraordinary news.
  • subtitle information also referred to as text super
  • the digital broadcast receiving apparatus 1 displays the content of the subtitle information.
  • the detection unit 110a further has a function of detecting whether or not caption information is included in the digital broadcast signal being received.
  • a method for detecting whether or not caption information is included in the digital broadcast signal being received for example, there is a method for detecting a caption ES included in the digital broadcast signal.
  • the display control unit 108 displays the enlarged video in a reduced size. At the same time, the subtitle information included in the digital broadcast signal is displayed. When there is no change in the caption information, the display control unit 108 shifts to a one-screen display after a predetermined time has elapsed.
  • the presence or absence of a video signal in a digital broadcast signal may be detected by referring to data in a broadcast TS other than the PMT, such as an EIT (Event Information Table) in which program information is described, as well as the PMT.
  • EIT Event Information Table
  • the detection unit 110a determines that there is no video signal in the received digital broadcast signal.
  • Example 2 When reception is bad, a digital broadcast receiving apparatus that executes display screen switching processing based on the reception quality value of a digital broadcast signal being received will be described.
  • This digital broadcast receiving apparatus includes functional blocks having the same configuration as the functional block diagram described in FIG.
  • the tuner X104 and the tuner Y105 described in FIG. 1 output a CN value indicating the reception quality value of the received digital broadcast signal to the broadcast reception control unit 110.
  • information indicating the reception quality value there are an RSSI value (Received Signal Strength: Received Signal Strength Indicator), a bit error rate, and the like.
  • the detection unit 110a of the broadcast reception control unit 110 detects the reception quality value of the digital broadcast signal being received based on this CN value.
  • the detection unit 110a is a determination unit that determines whether information such as a new image can be obtained from the digital broadcast signal being received by detecting the reception quality value of the digital broadcast signal being received.
  • the display control unit 108 controls the display number and display area of the video on the display unit 202 based on the reception quality value of the digital broadcast signal being received detected by the detection unit 110a.
  • the detection unit 110a stores the CN value of the digital broadcast signal input from the tuner X104 in the memory 112 with a time interval. Similarly, the detection unit 110a stores the CN value of the digital broadcast signal input from the tuner Y105 in the memory 112 with a time interval. The time interval is set to several hundreds of milliseconds, and the detection unit 110a executes a storage process for the memory 112 based on the timer resource supplied from the timer 111.
  • the detection unit 110a calculates an average value (also referred to as a moving average value) of the CN value of the digital broadcast signal input from the tuner X104 stored in the memory 112, and whether the average value is less than a predetermined value (threshold value). Determine whether.
  • a predetermined value threshold value
  • the display control unit 108 cannot display the video of the digital broadcast signal because the digital broadcast signal input from the tuner X104 does not satisfy the predetermined reception quality. If there is, the video display processing of this digital broadcast signal is stopped.
  • the detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner Y105 stored in the memory 112, and determines whether the average value is less than a predetermined value. When the average value of the CN values is less than the predetermined value, the display control unit 108 does not satisfy the predetermined reception quality of the digital broadcast signal input from the tuner Y 105, and the video of the digital broadcast signal cannot be displayed. If there is, the video display processing of this digital broadcast signal is stopped.
  • the display screen switching process can be executed based on, for example, a display screen switching table shown in FIG.
  • the display screen switching table 50 has a display state column 51 and a determination result column 52.
  • the display state column 51 records a screen display state indicating whether one screen is currently displayed, two screens are displayed, or not displayed. For example, when one screen is being displayed, the video signal (service 1) included in the digital broadcast signal input from the tuner X104 is displayed, and the video signal included in the digital broadcast signal input from the tuner Y105 (service 1). It is recorded that service 2) is hidden.
  • the display screen switching table 50 is stored in the memory 112, for example.
  • the reception quality value of the digital broadcast signal input from the tuner X104 is not less than a predetermined value / less than the predetermined value, and the video (service 1) of this digital broadcast signal can be displayed / cannot be displayed.
  • the reception quality value of the digital broadcast signal input from tuner Y105 is not less than a predetermined value / below the predetermined value, and the video (service 2) of this digital broadcast signal can be displayed / cannot be displayed. It is recorded.
  • the detection unit 110a detects that the service 1 cannot be displayed and the service 2 can be displayed.
  • the unit 108 executes the one-screen display in which the service 1 video is hidden and the service 2 video is enlarged and displayed as shown in the screen switching process (5).
  • FIG. 7 is a flowchart for explaining the display screen switching process based on the reception quality value.
  • the detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner X104, and determines whether the average value is less than a predetermined value (step S41). In addition, the detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner Y105, and determines whether the average value is less than a predetermined value (step S42).
  • step S43 the display control part 108 performs a display screen switching process based on the determination result of the detection part 110a, and the display screen switching table 50 (step S43). Thereafter, when the input of both digital broadcast signals input from the first reception system and the second reception system is stopped (step S44 / YES), the broadcast reception control unit 110 ends all the processes. When the input of the digital broadcast signal is continued (step S44 / NO), the process returns to step S41.
  • the predetermined value (threshold value) that is referred to when determining whether or not the video of the digital broadcast signal can be displayed can be freely adjusted.
  • a threshold value that is referred to when determining whether a digital broadcast signal image can be displayed or cannot be displayed that is, a display screen switch from a two-screen display to a one-screen display.
  • Threshold value that is referred to in processing and threshold value that is referred to when determining whether or not a digital broadcast signal image can be displayed when the current display state is one screen, that is, from one screen display to two screens By changing the threshold value referred to in the display screen switching process to display, it is possible to further prevent the display screen switching process from occurring frequently.
  • the threshold value referred to when shifting from the one-screen display to the two-screen display is made larger than the threshold value referred when shifting from the two-screen display to the one-screen display.
  • This threshold value can be, for example, a bit error rate capable of error correction when receiving a digital broadcast signal. Further, this threshold value may be set to a value smaller than the bit error rate to allow a state in which block noise is mixed in the display image. Further, the detection unit 110a may calculate an average value from the CN values stored in the memory 112 in the past few seconds. Thus, the average value of the reception quality values is calculated in order to suppress the influence when the CN value temporarily decreases or increases temporarily due to the movement of the user.
  • the display control unit 108 corresponds to the digital broadcast signal when the detection unit 110a detects a digital broadcast signal having no video signal from among the digital broadcast signals input from three or more reception systems.
  • the video display is stopped and the video corresponding to the digital broadcast signal having the video signal is enlarged and displayed. The same applies when the display screen switching process is executed based on the reception quality value.
  • FIG. 1 An application example for a receiving device having a receiving function of ISDB-T (One Seg) and ISDB-Tsb is shown.
  • a receiving device having a receiving function of ISDB-T (One Seg) and ISDB-Tsb For example, terrestrial digital broadcasting, BS digital broadcasting, and CS broadcasting can be received. You may apply the display screen switching process of this invention demonstrated in Example 1, 2 with respect to the receiver provided with the multiple screen display function.
  • DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver, 101 ... Antenna X, 102 ... Antenna Y, 103 ... Antenna switching part, 104 ... Tuner X, 105 ... Tuner Y, 106 ... Multimedia decoder X, 107 ... Multimedia decoder Y, 108 ... Display Control unit 109 ... Audio switching unit 110 110 Broadcast reception control unit 110a ... Detection unit 111 ... Timer 112 ... Memory 2 ... Cellular phone 201 ... Key input unit 202 ... Display unit 203 ... Antenna Z 204: wireless unit, 205: communication function control unit, 206: speech decoding unit, 207: speech encoding unit, 208: speaker, 209: microphone.

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Abstract

Provided is a digital broadcast reception device wherein when an image cannot be seen or there is no information that has to be seen, video to be displayed is selected on the basis of broadcast contents and the reception qualities of digital broadcast signals, and screen switching processing is accurately performed. A detection unit (110a) detects the presence or absence of a video signal in a digital broadcast signal that is being received on the basis of a PMT included in the digital broadcast signal. A display control unit (108) controls the number of displays and display region of video on a display unit (202) according to the detection of the presence or absence of the video signal in the digital broadcast signal that is being received by the detection unit (110a). For example, when the detection unit (110a) detects a digital broadcast signal with no video signal from among digital broadcast signals that are being received, the display control unit (108) stops video display processing corresponding to the digital broadcast signal with no video signal and enlarges and displays video corresponding to a digital broadcast signal with a video signal on the display unit (202) when multiple pieces of video are displayed on the display unit (202).

Description

複数画面表示機能を備えたデジタル放送受信装置Digital broadcast receiver with multi-screen display function
　本発明は、複数画面を表示する機能を備えたデジタル放送受信装置に関する。 The present invention relates to a digital broadcast receiving apparatus having a function of displaying a plurality of screens.
　従来から、２つの映像を１つの表示パネルに同時表示する２画面表示機能を備えた表示装置が提案されている。特許文献１には、このような２画面表示機能を備えた表示装置が開示されている。
　この表示装置は、第１受信系統（入力系統とも言う）、第２受信系統から入力される各映像信号の同期信号の有無を検知し、第１および第２受信系統の両者から入力される各映像信号の同期信号を検知した場合、両者の受信系統から入力される映像信号の映像を１つの表示パネルに２画面表示する。また、第１または第２受信系統の何れか１つの受信系統から入力される映像信号の同期信号を検知した場合、同期信号を検知した受信系統から入力される映像信号の映像を１つの表示パネルに１画面表示する。 Conventionally, a display device having a two-screen display function for simultaneously displaying two images on one display panel has been proposed. Patent Document 1 discloses a display device having such a two-screen display function.
This display device detects the presence or absence of a synchronization signal of each video signal input from a first receiving system (also referred to as an input system) and a second receiving system, and inputs each from both the first and second receiving systems. When the synchronization signal of the video signal is detected, the video of the video signal input from both receiving systems is displayed on two screens on one display panel. In addition, when a synchronization signal of a video signal input from any one of the first or second reception systems is detected, the video of the video signal input from the reception system detecting the synchronization signal is displayed on one display panel. One screen is displayed.
　ところで、２０１１年７月に現在のアナログテレビジョン放送が停止され、アナログテレビジョン用の周波数帯（ＶＨＦ帯）に新たに割り当てられるマルチメディア放送が開始される予定である。このようなマルチメディア放送を受信するため、携帯端末に、現在搭載されているISDB（Integrated Services Digital Broadcasting）-T（ワンセグ・ＵＨＦ帯)に加え、ISDB-Tmm(ＶＨＦ－Ｈ帯)、ISDB-Tsb(ＶＨＦ－Ｌ帯)のマルチメディア放送受信機能が搭載されることが予想される。 By the way, the current analog television broadcasting is stopped in July 2011, and multimedia broadcasting newly allocated to the analog television frequency band (VHF band) is scheduled to start. In order to receive such multimedia broadcasting, ISDB-Tmm (VHF-H band), ISDB- in addition to ISDB (Integrated Services Digital Broadcasting) -T (One Seg / UHF band) currently installed in mobile terminals. It is expected that a multimedia broadcast receiving function of Tsb (VHF-L band) will be installed.
　これらの放送方式は共通点が多いので、携帯端末に、ユーザーが放送方式を意識しないユーザーインターフェースが設けられる可能性が大きい。また、ISDB-TsbやISDB-Tmmではダウンロードサービスも導入されるので、リアルタイム放送を視聴しながら、ダウンロードを行うユースケースを考え、ダブルチューナー搭載の受信端末が主流になる可能性がある。 Since these broadcasting systems have a lot in common, there is a high possibility that a user interface is provided on the mobile terminal so that the user is not aware of the broadcasting system. In addition, ISDB-Tsb and ISDB-Tmm will also introduce a download service, so there is a possibility that receiving terminals equipped with double tuners will become mainstream, considering the use case of downloading while watching real-time broadcasting.
特開２００１－３４６１２１号公報JP 2001-346121 A
　しかし、上述した従来技術では、２画面で表示している場合、片方の画面において画像が見えない場合、または見るべき情報がない場合でも２画面表示が続いてしまう。即ち、その画面を見続けても新たな情報が得られない状態になっていても、その画面表示が続いてしまう。 However, in the above-described conventional technology, when displaying on two screens, even when an image is not visible on one screen or when there is no information to be viewed, the two-screen display continues. That is, even if the screen is continuously viewed, the screen display continues even if new information cannot be obtained.
　片方の画面において画像が見えない場合、または見るべき情報がない場合（その画面を見続けても新たな情報が得られない状態）とは、例えば、映像がない、静止画が続いている、受信状態が悪い場合などである。 When an image is not visible on one screen, or when there is no information to be viewed (a state where new information cannot be obtained even if the screen is continuously viewed), for example, there is no video, a still image continues, This is the case when the reception status is poor.
　ここで、受信状態が悪い場合について、特許文献１には、表示装置が、映像信号の同期信号を検知することにより、２画面表示と１画面表示の切り替えを自動で行うことが記載されている。しかし、特許文献１の発明では、携帯端末を利用して２画面表示されている２つの映像を視聴している際に、映像信号の同期信号を受信できる場所とできない場所とを頻繁に移動すると、２画面表示と１画面表示の切り替えが頻繁に行われ、視聴中のユーザーに不快感を与える恐れがある。 Here, in the case where the reception state is bad, Patent Document 1 describes that the display device automatically switches between the two-screen display and the one-screen display by detecting the synchronization signal of the video signal. . However, in the invention of Patent Document 1, when two videos displayed on two screens are viewed using a mobile terminal, the location where the synchronization signal of the video signal can be received and the location where the synchronization signal cannot be received are frequently moved. Switching between the two-screen display and the one-screen display is frequently performed, which may cause discomfort to the viewing user.
　また、静止画が続いている場合とは、別々の放送方式（ISDB-T，ISDB-Tsb）で放送される２種類の動画映像を２画面表示している間に、例えば、放送形式ISDB-Tsbの動画映像が静止画になり、その状態が継続している場合である。ユーザーは、動画と異なりこの静止画を一定時間視聴すればよく、継続的に視聴する必要性は少ないが、このような場合であっても、２画面表示が継続される。 In addition, when still images are continuing, while two types of video images broadcast in different broadcasting systems (ISDB-T, ISDB-Tsb) are displayed on two screens, for example, the broadcasting format ISDB- This is a case where the Tsb moving image becomes a still image and the state continues. Unlike a moving image, the user only has to view this still image for a certain period of time, and there is little need for continuous viewing. Even in such a case, the two-screen display is continued.
　本発明は、かかる実情に鑑みてなされたものであり、複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示する複数画面表示機能を備えたデジタル放送受信装置において、画像が見えない場合、または見るべき情報がない場合に放送内容やデジタル放送信号の受信品質に基づいて表示する映像を選択し画面の切り替え処理を適確に行うデジタル放送受信装置を提供することを目的とする。 The present invention has been made in view of such a situation, and is provided with a multi-screen display function for displaying a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of receiving systems on a single display unit. In a broadcast receiving apparatus, when an image is not visible or there is no information to be viewed, a digital broadcast receiving apparatus that selects a video to be displayed based on the broadcast content and the reception quality of a digital broadcast signal and appropriately performs screen switching processing The purpose is to provide.
　第１の技術手段は、複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、前記表示部に表示する表示映像を制御する表示制御部と、受信中のデジタル放送信号から新たな情報が得られるかどうかを判断する判断部を備え、前記表示制御部は、前記判断部による判断により、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置である。 The first technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit. A display control unit, and a determination unit that determines whether new information can be obtained from the digital broadcast signal being received, wherein the display control unit determines the number of images displayed on the display unit based on the determination by the determination unit. And a digital broadcast receiver characterized by controlling a display area.
　第２の技術手段は、複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、前記表示部に表示する表示映像を制御する表示制御部と、デジタル放送信号に含まれる、映像信号の有無情報が記録されたテーブルに基づき、受信中のデジタル放送信号における映像信号の有無を検知する検知部を備え、前記表示制御部は、前記検知部による受信中のデジタル放送信号における映像信号の有無の検知により、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置である。 The second technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit. A display control unit, and a detection unit that detects presence / absence of a video signal in the digital broadcast signal being received based on a table in which the presence / absence information of the video signal included in the digital broadcast signal is recorded, and the display control unit The digital broadcast receiving apparatus is characterized in that the number of images displayed on the display unit and the display area are controlled by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detecting unit.
　第３の技術手段は、第２の技術手段のデジタル放送受信装置において、前記検知部は、更に、デジタル放送信号の映像が動画か、字幕情報か、静止画（字幕を含む／又は含まない）かを検知する機能を有し、前記表示制御部は、前記検知部が、受信中のデジタル放送信号に含まれる映像信号の映像が前記字幕情報または前記静止画であることを検知すると、一定時間経過後に、当該字幕情報又は当該静止画の映像表示処理を停止すると共に、表示している動画の映像を前記表示部に拡大表示することを特徴とするものである。 According to a third technical means, in the digital broadcast receiving apparatus according to the second technical means, the detection unit further determines whether the video of the digital broadcast signal is a moving image, caption information, or a still image (including / not including caption). And the display control unit detects that the video of the video signal included in the digital broadcast signal being received is the subtitle information or the still image for a certain period of time. After the elapse of time, the video display processing of the subtitle information or the still image is stopped, and the video of the moving image being displayed is enlarged and displayed on the display unit.
　第４の技術手段は、第３の技術手段のデジタル放送受信装置において、前記検知部は、更に、前記静止画の映像信号をメモリに記憶し、前記メモリに記憶された前記静止画の映像信号の差分を検知する機能を備え、前記表示制御部は、前記検知部が、前記静止画の映像信号の差分を検知すると、拡大表示中の映像を縮小表示すると共に、静止画の映像表示処理を再開することを特徴とするものである。 According to a fourth technical means, in the digital broadcast receiving apparatus according to the third technical means, the detection unit further stores the video signal of the still image in a memory, and the video signal of the still image stored in the memory The display control unit, when the detection unit detects a difference in the video signal of the still image, displays the enlarged image in a reduced size and performs still image display processing. It is characterized by restarting.
　第５の技術手段は、複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、前記表示部に表示する表示映像を制御する表示制御部と、受信したデジタル放送信号のＣＮ値、ＲＳＳＩ値、ビットエラーレート等の中の何れかの値に基づき、受信中のデジタル放送信号の受信品質値を検知する検知部を備え、前記表示制御部は、前記検知部が検知した受信中のデジタル放送信号の受信品質値に基づき、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置である。 A fifth technical means controls a display video displayed on the display unit in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on a single display unit. A display control unit, and a detection unit that detects a reception quality value of the digital broadcast signal being received based on any one of the CN value, RSSI value, bit error rate, and the like of the received digital broadcast signal, The display control unit controls a display number and a display area of video on the display unit based on a reception quality value of a digital broadcast signal being received detected by the detection unit. It is.
　第６の技術手段は、第５の技術手段のデジタル放送受信装置において、デジタル放送信号の受信品質値を、時間間隔を置いて記憶するメモリを備え、前記検知部は、前記メモリに記憶された受信品質値の平均値を、デジタル放送信号の受信品質値とすることを特徴とするものである。 According to a sixth technical means, in the digital broadcast receiving apparatus according to the fifth technical means, the digital broadcast signal receiving device includes a memory for storing the reception quality value of the digital broadcast signal with a time interval, and the detection unit is stored in the memory. The average value of the reception quality values is the reception quality value of the digital broadcast signal.
　本発明によれば、複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、画像が見えない場合、または見るべき情報がない場合（その画面を見続けても新たな情報が得られない状態）にそのような画面の表示を終わらせることができる。
　即ち、映像がない場合や静止画が続いている場合は、放送内容を示すＰＭＴ（Program Map Table）等から得られる情報により、受信状態が悪い場合は、ＣＮ値（Ｃ／Ｎ値：Carrier to Noise ratioとも言う）等のデジタル放送信号の受信品質を示す情報に基づいて表示する映像を選択し画面の切り替え処理を適確に行うので、ユーザーは、最適な映像を視聴することができる。 According to the present invention, in a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on one display unit, when an image is not visible or information to be viewed is present. If there is no such information (the state where new information cannot be obtained even if the user continues to view the screen), the display of such a screen can be terminated.
In other words, when there is no video or when a still image continues, the CN value (C / N value: Carrier to Since a video to be displayed is selected based on information indicating the reception quality of a digital broadcast signal such as “Noise ratio” and the screen switching process is appropriately performed, the user can view the optimal video.
本発明に係るデジタル放送受信装置の機能ブロック図であるIt is a functional block diagram of the digital broadcast receiver according to the present invention. ＰＭＴに基づく表示画面切り替え処理を説明するフロー図である。It is a flowchart explaining the display screen switching process based on PMT. 静止画の映像表示停止処理、動画の映像拡大表示処理を説明するフロー図である。It is a flowchart explaining the video display stop process of a still image, and the video expansion display process of a moving image. 静止画の映像表示停止処理、動画の映像拡大表示処理を説明するフロー図である。It is a flowchart explaining the video display stop process of a still image, and the video expansion display process of a moving image. 静止画の映像表示再開処理、動画の映像縮小表示処理を説明するフロー図である。It is a flowchart explaining the video display restart process of a still image, and the video reduction display process of a moving image. 表示画面切り替えテーブルを説明する図である。It is a figure explaining a display screen switching table. 受信品質値に基づく表示画面切り替え処理を説明するフロー図である。It is a flowchart explaining the display screen switching process based on a reception quality value.
　（実施例１）
（映像がない場合）
　図１は、本発明に係るデジタル放送受信装置の機能ブロック図である。デジタル放送受信装置１は、携帯電話機２に搭載されている。なお、携帯電話機２は、一例であり、例えば、デジタル放送受信装置１は、携帯型の電子機器や車載型の電子機器に搭載されていてもよい。 Example 1
(If there is no video)
FIG. 1 is a functional block diagram of a digital broadcast receiving apparatus according to the present invention. The digital broadcast receiver 1 is mounted on a mobile phone 2. The mobile phone 2 is an example, and for example, the digital broadcast receiving device 1 may be mounted on a portable electronic device or a vehicle-mounted electronic device.
　デジタル放送受信装置１は、アンテナＸ１０１、アンテナＹ１０２、アンテナ切替部１０３、チューナーＸ１０４、チューナーＹ１０５、マルチメディアデコーダＸ１０６、マルチメディアデコーダＹ１０７、表示制御部１０８、音声切替部１０９、放送受信制御部１１０、タイマ１１１、メモリ１１２を備える。 The digital broadcast receiver 1 includes an antenna X101, an antenna Y102, an antenna switching unit 103, a tuner X104, a tuner Y105, a multimedia decoder X106, a multimedia decoder Y107, a display control unit 108, an audio switching unit 109, a broadcast reception control unit 110, A timer 111 and a memory 112 are provided.
　アンテナＸ１０１は、例えば、ISDB-Tsb放送受信に用いられるアンテナで、デジタル放送受信装置１に対して着脱可能な放送波受信用イヤホンアンテナから構成される。
　アンテナＹ１０２は、例えば、ISDB-T（ワンセグ）放送受信に用いられるアンテナで、デジタル放送受信装置１に内蔵されている内蔵アンテナから構成される。 The antenna X101 is an antenna used for ISDB-Tsb broadcast reception, for example, and is composed of a broadcast wave receiving earphone antenna that can be attached to and detached from the digital broadcast receiving apparatus 1.
The antenna Y102 is, for example, an antenna used for ISDB-T (one-segment) broadcast reception, and is composed of a built-in antenna built in the digital broadcast receiving apparatus 1.
　アンテナ切替部１０３は、放送受信制御部１１０の制御に基づき、チューナーＸ１０４、チューナーＹ１０５に出力するデジタル放送信号を、アンテナＸ１０１、アンテナＹ１０２のどちらから取得するか選択し、選択結果に応じて使用するアンテナを切り替える。 Based on the control of the broadcast reception control unit 110, the antenna switching unit 103 selects whether the digital broadcast signal output to the tuner X104 or the tuner Y105 is acquired from the antenna X101 or the antenna Y102, and uses it according to the selection result. Switch the antenna.
　チューナーＸ１０４、は、ISDB-T、ISDB-Tsbの両放送方式で送信されるデジタル放送信号を復調してＴＳ（Transport Stream）を得る。そして、このＴＳをマルチメディアデコーダＸ１０６に出力する。
　チューナーＹ１０５もチューナーＸ１０４と同じく、ＴＳをマルチメディアデコーダＹ１０７に出力する。 The tuner X104 demodulates a digital broadcast signal transmitted by both the ISDB-T and ISDB-Tsb broadcast systems to obtain a TS (Transport Stream). Then, this TS is output to the multimedia decoder X106.
Similarly to the tuner X104, the tuner Y105 outputs TS to the multimedia decoder Y107.
　マルチメディアデコーダＸ１０６は、ISDB-T、ISDB-Tsbの両放送方式で送信されるデジタル放送信号に含まれるＴＳをデコードし、チューナーＸ１０４が出力したＴＳから映像信号・音声信号を得る。そして、この映像信号を表示制御部１０８に出力し、この音声信号を音声切替部１０９に出力する。 The multimedia decoder X106 decodes TS included in the digital broadcast signal transmitted by both the ISDB-T and ISDB-Tsb broadcasting systems, and obtains a video signal / audio signal from the TS output from the tuner X104. Then, this video signal is output to the display control unit 108, and this audio signal is output to the audio switching unit 109.
　マルチメディアデコーダＹ１０７もマルチメディアデコーダＸ１０６と同じく、ＴＳから映像信号・音声信号を得て、この映像信号を表示制御部１０８に出力し、この音声信号を音声切替部１０９に出力する。 Similarly to the multimedia decoder X106, the multimedia decoder Y107 also obtains a video signal / audio signal from the TS, outputs this video signal to the display control unit 108, and outputs this audio signal to the audio switching unit 109.
　表示制御部１０８は、放送受信制御部１１０の制御に基づき、マルチメディアデコーダＸ１０６またはＹ１０７から入力される映像信号の映像を表示する１画面表示処理や、マルチメディアデコーダＸ１０６およびＹ１０７から入力される映像信号の映像を表示する２画面表示処理を実行する。 The display control unit 108, based on the control of the broadcast reception control unit 110, performs a one-screen display process for displaying the video signal input from the multimedia decoder X106 or Y107, and the video input from the multimedia decoder X106 and Y107. A two-screen display process for displaying the video of the signal is executed.
　例えば、表示部２０２の解像度が、FWVGA（８５４×４８０ピクセル）の場合であって、マルチメディアデコーダＸ１０６およびＹ１０７から入力されるデジタル放送信号に含まれる映像信号に対応する映像が、どちらもQVGA１６：９（３２０×１８０ピクセル）の場合、表示制御部１０８は、各映像の表示領域を、４／３倍に拡大して、マルチメディアデコーダＸ１０６から入力される映像信号の映像を表示部２０２の左側に表示し、マルチメディアデコーダＹ１０７から入力される映像信号の映像を表示部２０２の右側に表示する。 For example, when the resolution of the display unit 202 is FWVGA (854 × 480 pixels), the video corresponding to the video signal included in the digital broadcast signal input from the multimedia decoders X106 and Y107 is both QVGA16: In the case of 9 (320 × 180 pixels), the display control unit 108 enlarges the display area of each video by 4/3 times, and displays the video of the video signal input from the multimedia decoder X106 on the left side of the display unit 202. The video of the video signal input from the multimedia decoder Y107 is displayed on the right side of the display unit 202.
　また、表示制御部１０８は、後述する放送受信制御部１１０の検知部１１０ａによる受信中のデジタル放送信号における映像信号の有無の検知により、表示部２０２における映像の表示数、および、表示領域を制御する。なお、この制御処理の詳細については後述する。 Further, the display control unit 108 controls the display number and display area of the video on the display unit 202 by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detection unit 110a of the broadcast reception control unit 110 described later. To do. Details of this control process will be described later.
　音声切替部１０９は、放送受信制御部１１０の制御により、マルチメディアデコーダＸ１０６、マルチメディアデコーダＹ１０７から入力される音声信号のどちらかを選択し、選択した音声信号をスピーカ２０８に出力する。 The audio switching unit 109 selects one of the audio signals input from the multimedia decoder X106 and the multimedia decoder Y107 under the control of the broadcast reception control unit 110, and outputs the selected audio signal to the speaker 208.
　放送受信制御部１１０は、デジタル放送信号の受信処理に係る各種処理を制御する。例えば、放送受信制御部１１０は、アンテナ切替部１０３を制御し、チューナーＸ１０４、Ｙ１０５に接続するアンテナＸ１０１、Ｙ１０２を切り替える制御を実行する。また、放送受信制御部１１０は、チューナーＸ１０４、Ｙ１０５、マルチメディアデコーダＸ１０６、Ｙ１０７の動作制御を実行する。特に、放送受信制御部１１０は、マルチメディアデコーダＸ１０６、Ｙ１０７に対して解析対象のＰＳＩ(Program Specific Information)／ＳＩ(Service Information)のＰＩＤ(Packet IDentity)を指示し、マルチメディアデコーダが出力するパケットからセクションを構築、解析する。 The broadcast reception control unit 110 controls various processes related to the digital broadcast signal reception process. For example, the broadcast reception control unit 110 controls the antenna switching unit 103 to execute control for switching the antennas X101 and Y102 connected to the tuners X104 and Y105. The broadcast reception control unit 110 also performs operation control of the tuners X104 and Y105 and the multimedia decoders X106 and Y107. In particular, the broadcast reception control unit 110 instructs the multimedia decoders X106 and Y107 to specify PID (Packet IDentity) of PSI (Program Specific Information) / SI (Service Information) to be analyzed, and the packet output by the multimedia decoder Build and analyze sections from
　他にも、放送受信制御部１１０は、表示制御部１０８に対して、後述する１画面表示から２画面表示への表示画面切り替え処理または２画面表示から１画面表示への表示画面切り替え処理（以下、表示画面切り替え処理と略記する）の実行を指示する。具体的には、放送受信制御部１１０は、表示制御部１０８が表示制御する映像の拡大率や縮小率、表示・非表示、表示位置について指示する。 In addition, the broadcast reception control unit 110 causes the display control unit 108 to perform a display screen switching process from a one-screen display to a two-screen display, which will be described later, or a display screen switching process from a two-screen display to a one-screen display (hereinafter referred to as “display screen switching process”). , Abbreviated as display screen switching processing). Specifically, the broadcast reception control unit 110 gives an instruction regarding the enlargement / reduction ratio, display / non-display, and display position of the video that the display control unit 108 controls to display.
　検知部１１０ａは、デジタル放送信号に含まれる、映像信号の有無情報が記録されたテーブルに基づき、受信中のデジタル放送信号における映像信号の有無を検知する。このテーブルは、例えば、ＰＭＴである。ＰＭＴは、デジタル放送信号のＭＰＥＧ２ＴＳ中に、プログラムの数だけ含まれるテーブルであり、ＭＰＥＧ２セクションとして構成される。 The detecting unit 110a detects the presence / absence of a video signal in the digital broadcast signal being received based on a table in which the presence / absence information of the video signal included in the digital broadcast signal is recorded. This table is, for example, a PMT. The PMT is a table included in the number of programs in the MPEG2TS of the digital broadcast signal, and is configured as an MPEG2 section.
　ＰＭＴには、プログラムの識別に用いられるプログラムナンバー、プログラムの付加情報、プログラムに属するＥＳ（Elementary Stream）に関する情報が記録されている。すなわち、ＰＭＴには、ＰＭＴのストリーム形式種別と呼ばれる番号と共にプログラムに含まれる映像や音声等のＰＩＤが記録されている。
　検知部１１０ａは、このＰＭＴのストリーム形式種別と呼ばれる番号を参照することにより、ＴＳにおける映像ＥＳの有無、つまり、デジタル放送信号における映像信号の有無を検知することができる。
　この検知部１１０ａは、受信中のデジタル放送信号から新たな画像などの情報が得られるかどうかを、映像信号の有無情報が記録されたテーブルに基づき判断する判断部である。 In the PMT, a program number used for program identification, additional information on the program, and information on ES (Elementary Stream) belonging to the program are recorded. That is, the PMT records PIDs such as video and audio included in the program together with a number called a PMT stream format type.
The detection unit 110a can detect the presence / absence of the video ES in the TS, that is, the presence / absence of the video signal in the digital broadcast signal, by referring to the number called the PMT stream format type.
The detection unit 110a is a determination unit that determines whether information such as a new image can be obtained from a digital broadcast signal being received based on a table in which presence / absence information of a video signal is recorded.
　表示制御部１０８は、検知部１１０ａによる受信中のデジタル放送信号における映像信号の有無の検知により、表示部２０２における映像の表示数、および、表示領域を制御する。
　例えば、検知部１１０ａが、受信中のデジタル放送信号の中から映像信号が無いデジタル放送信号を検知すると、表示制御部１０８は、表示部２０２に複数の映像を表示している場合、映像信号が無いデジタル放送信号に対応する映像表示処理を停止すると共に、映像信号を有するデジタル放送信号に対応する映像を表示部２０２に拡大表示する。 The display control unit 108 controls the display number and display area of the video on the display unit 202 by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detection unit 110a.
For example, when the detection unit 110a detects a digital broadcast signal without a video signal from the digital broadcast signals being received, the display control unit 108 displays a plurality of videos on the display unit 202. The video display processing corresponding to the digital broadcast signal that does not exist is stopped, and the video corresponding to the digital broadcast signal including the video signal is enlarged and displayed on the display unit 202.
　タイマ１１１は、放送受信制御部１１０が、放送受信処理に必要なタイマ資源を供給する。本発明においては、２画面表示を一定時間継続したり、チューナーからの情報を一定時間毎に取得する際に必要となる場合を例示するが、これらの時間計測は、放送受信制御部１１０がタイマに対して所望の値を設定することで実現する。
　メモリ１１２は、各種制御情報等を記憶する記憶部である。 The timer 111 supplies timer resources necessary for broadcast reception processing by the broadcast reception control unit 110. The present invention exemplifies a case where two-screen display is continued for a certain period of time or when it is necessary to acquire information from the tuner every certain period of time. This is realized by setting a desired value for.
The memory 112 is a storage unit that stores various control information and the like.
　次に、携帯電話機２の機能ブロックについて説明する。
　携帯電話機２は、キー入力部２０１、表示部２０２、アンテナＺ２０３、無線部２０４、通信機能制御部２０５、音声復号部２０６、音声符号化部２０７、スピーカ２０８、マイク２０９を備える。 Next, functional blocks of the mobile phone 2 will be described.
The mobile phone 2 includes a key input unit 201, a display unit 202, an antenna Z203, a radio unit 204, a communication function control unit 205, a voice decoding unit 206, a voice encoding unit 207, a speaker 208, and a microphone 209.
　キー入力部２０１は、操作用キーから構成され、ユーザーのキー操作を検知し、検知結果を放送受信制御部１１０に出力する。
　表示部２０２は、液晶パネル等から構成され、デジタル放送信号に含まれる映像信号の映像や操作用画面等を表示する。 The key input unit 201 includes operation keys, detects a user's key operation, and outputs the detection result to the broadcast reception control unit 110.
The display unit 202 is configured by a liquid crystal panel or the like, and displays a video signal image, an operation screen, and the like included in the digital broadcast signal.
　アンテナＺ２０３は、携帯電話通信用アンテナで、無線部２０４は、携帯電話通信に関する各種無線通信処理を実行し、受信音声信号を通信機能制御部２０５に出力する。
　通信機能制御部２０５は、携帯電話通信処理に関する各種通信処理を制御する。また、通信機能制御部２０５は、無線部２０４から入力される音声信号を音声復号部２０６に出力し、音声符号化部２０７から入力される音声信号を無線部２０４に出力する。 The antenna Z 203 is an antenna for mobile phone communication, and the wireless unit 204 executes various wireless communication processes related to mobile phone communication, and outputs a received voice signal to the communication function control unit 205.
The communication function control unit 205 controls various communication processes related to the mobile phone communication process. In addition, the communication function control unit 205 outputs the audio signal input from the radio unit 204 to the audio decoding unit 206 and outputs the audio signal input from the audio encoding unit 207 to the radio unit 204.
　音声復号部２０６は、通信機能制御部２０５から入力される受信音声信号を復号して、スピーカ２０８に出力する。
　音声符号化部２０７は、通話時にマイク２０９から入力される音声信号を符号化して、通信機能制御部２０５に出力する。 The audio decoding unit 206 decodes the received audio signal input from the communication function control unit 205 and outputs it to the speaker 208.
The audio encoding unit 207 encodes an audio signal input from the microphone 209 during a call and outputs the encoded audio signal to the communication function control unit 205.
　本発明に係るデジタル放送受信装置１において実行される表示画面切り替え処理について、図２のフロー図を用いて説明する。
　以下の説明では、チューナーＸ１０４、マルチメディアデコーダＸ１０６による、デジタル放送信号の受信処理、復調処理、更に、復調されたデジタル放送信号に含まれる映像信号・音声信号に対する各種処理から構成される一連の処理系を第１受信系統と呼び、チューナーＹ１０５、マルチメディアデコーダＹ１０７による、デジタル放送信号の受信処理、復調処理、更に、復調されたデジタル放送信号に含まれる映像信号・音声信号に対する各種処理から構成される一連の処理系を第２受信系統と呼ぶ。 The display screen switching process executed in the digital broadcast receiving apparatus 1 according to the present invention will be described with reference to the flowchart of FIG.
In the following description, a series of processing composed of digital broadcast signal reception processing and demodulation processing by the tuner X104 and multimedia decoder X106, and various processing for video signals and audio signals included in the demodulated digital broadcast signals. This system is called the first receiving system, and is composed of digital broadcast signal reception processing and demodulation processing by the tuner Y105 and multimedia decoder Y107, and various processing for video signals and audio signals included in the demodulated digital broadcast signals. A series of processing systems are referred to as a second receiving system.
　また、ユーザーは、デジタル放送受信装置１を利用して、第１受信系統でISDB-T（ワンセグ）方式で送信されるデジタル放送信号に対応する映像（サービスとも言う）を視聴中、第２受信系統でISDB-Tsb方式で送信されるデジタル放送信号に対応する映像を視聴中であるとする。なお、上記放送形式の組み合わせに限定されるものではなく、例えば、第１受信系統でISDB-Tsb方式で送信されるデジタル放送信号を受信してもよい。
　ここでは、第１受信系統で視聴中のサービスをサービス１、第２受信系統で視聴中のサービスをサービス２とする。 In addition, the user uses the digital broadcast receiving device 1 to view the video (also referred to as service) corresponding to the digital broadcast signal transmitted by the ISDB-T (One Seg) system in the first reception system, and receive the second reception. Assume that a video corresponding to a digital broadcast signal transmitted by the ISDB-Tsb system is being watched. Note that the present invention is not limited to the combination of the broadcast formats, and for example, a digital broadcast signal transmitted by the ISDB-Tsb method may be received by the first reception system.
Here, the service being viewed in the first receiving system is referred to as service 1, and the service being viewed in the second receiving system is referred to as service 2.
　この状態におけるデジタル放送受信装置１の表示制御部１０８は、第１受信系統、第２受信系統のそれぞれから入力される２つのデジタル放送信号に対応する２つの映像を表示部２０２に表示している。 In this state, the display control unit 108 of the digital broadcast receiving apparatus 1 displays two videos corresponding to two digital broadcast signals input from the first reception system and the second reception system on the display unit 202. .
　ステップＳ１で、検知部１１０ａは、第１受信系統、第２受信系統から入力されるデジタル放送信号に含まれるＰＭＴを監視する。以下の説明では、第２受信系統から入力されるISDB-Tsb形式のデジタル放送信号に映像信号が含まれなくなった場合を例示して説明する。このとき、第２受信系統から入力されるデジタル放送信号に含まれるＰＭＴには、デジタル放送信号に映像信号が無いという情報が新たに記録され、前記ＰＭＴが更新されている。 In step S1, the detection unit 110a monitors the PMT included in the digital broadcast signal input from the first reception system and the second reception system. In the following description, the case where the video signal is no longer included in the ISDB-Tsb format digital broadcast signal input from the second receiving system will be described as an example. At this time, information indicating that there is no video signal in the digital broadcast signal is newly recorded in the PMT included in the digital broadcast signal input from the second receiving system, and the PMT is updated.
　検知部１１０ａが、前記ＰＭＴが更新されたことを検知した場合（ステップＳ２／ＹＥＳ）、放送受信制御部１１０は、マルチメディアデコーダＸ１０６、Ｙ１０７からＰＭＴのパケットを受信する。そして、放送受信制御部１１０は、ＰＭＴパケットのＰＭＴセクションを構築し解析を行う。検知部１１０ａは、放送受信制御部１１０が解析したＰＭＴに基づき、このＰＭＴを含むデジタル放送信号における映像信号の有無を検知する（ステップＳ３）。 When the detection unit 110a detects that the PMT has been updated (step S2 / YES), the broadcast reception control unit 110 receives PMT packets from the multimedia decoders X106 and Y107. Then, the broadcast reception control unit 110 builds and analyzes the PMT section of the PMT packet. Based on the PMT analyzed by the broadcast reception control unit 110, the detection unit 110a detects the presence / absence of a video signal in a digital broadcast signal including the PMT (step S3).
　検知部１１０ａが、前記ＰＭＴを含むデジタル放送信号に映像信号が無いことを検知すると（ステップＳ３／映像信号が無いデジタル放送信号を検知）、表示制御部１０８が２画面表示処理を実行中か否かを判定する（ステップＳ４）。 When the detection unit 110a detects that there is no video signal in the digital broadcast signal including the PMT (step S3 / detects a digital broadcast signal without a video signal), whether or not the display control unit 108 is executing a two-screen display process. Is determined (step S4).
　ここでは、２画面表示中なので（ステップＳ４／ＹＥＳ）、表示制御部１０８は、映像信号が無いデジタル放送信号に対応する映像表示処理を停止し（ステップＳ５）、映像信号を有するデジタル放送信号に対応する映像を表示部２０２に拡大表示する（ステップＳ６）。即ち、表示制御部１０８は、表示部２０２における映像の表示数を１に制御し、表示する映像の表示領域を拡大制御する。 Here, since two screens are being displayed (step S4 / YES), the display control unit 108 stops the video display processing corresponding to the digital broadcast signal having no video signal (step S5), and converts the digital broadcast signal having the video signal. The corresponding video is enlarged and displayed on the display unit 202 (step S6). That is, the display control unit 108 controls the display number of the video on the display unit 202 to 1 and enlarges the display area of the video to be displayed.
　その後、第１受信系統、第２受信系統から入力される両デジタル放送信号の入力が停止した場合には（ステップＳ７／ＹＥＳ）、放送受信制御部１１０は、全処理を終了する。デジタル放送信号の入力が継続している場合には（ステップＳ７／ＮＯ）、ステップＳ１に戻る。 Thereafter, when the input of both digital broadcast signals input from the first reception system and the second reception system is stopped (step S7 / YES), the broadcast reception control unit 110 ends all the processes. When the input of the digital broadcast signal is continued (step S7 / NO), the process returns to step S1.
　上記のステップＳ５，Ｓ６の処理を終了し、１画面表示を実行している場合において、検知部１１０ａが、映像信号が無くなったデジタル放送信号が、再び映像信号を有するようになったことを検知すると（ステップＳ３／映像信号が有るデジタル放送信号を検知）、検知部１１０ａは、表示制御部１０８が２画面表示処理を実行中か否かを判定する（ステップＳ８）。 When the processing in steps S5 and S6 is finished and one-screen display is being executed, the detection unit 110a detects that the digital broadcast signal that has lost the video signal has the video signal again. Then (step S3 / detecting a digital broadcast signal having a video signal), the detection unit 110a determines whether or not the display control unit 108 is executing a two-screen display process (step S8).
　前述の例では、サービス１の映像のみが表示部２０２に表示されている状態、即ち、１画面表示中なので（ステップＳ８／ＮＯ）、表示制御部１０８は、ステップＳ６において拡大表示された映像（サービス１）を縮小表示し（ステップＳ９）、映像信号を有するデジタル放送信号に対応する映像（サービス２）の表示処理を開始する（ステップＳ１０）。即ち、表示制御部１０８は、表示部２０２における映像の表示数を２に制御し、２つの映像が表示部２０２内に表示されるように映像の表示領域を制御する。 In the above example, since only the video of service 1 is displayed on the display unit 202, that is, one screen is being displayed (step S8 / NO), the display control unit 108 enlarges the video (step S6). The service 1) is reduced and displayed (step S9), and the display processing of the video (service 2) corresponding to the digital broadcast signal having the video signal is started (step S10). That is, the display control unit 108 controls the display number of the video on the display unit 202 to 2 and controls the video display area so that two videos are displayed in the display unit 202.
　なお、上記の説明ではサービス１（ISDB-T（ワンセグ））のＰＭＴ更新には触れていないが、ワンセグの場合、映像コンポーネントの消失可能性が低いので、このケースを無視している。
　第１受信系統および第２受信系統で受信したデジタル放送信号がISDB-Tsb方式である場合において、第１受信系統および第２受信系統で受信したデジタル放送信号に映像信号が含まれなくなると（サービス１、サービス２とも、映像コンポーネントがない状態）、放送受信制御部１１０は、表示制御部１０８に対し、双方のデジタル放送信号に対応する映像表示を停止するように指示する。表示部２０２がＬＣＤである場合には、バックライトの消灯を行うことも可能となり、余分な電力消費を抑えることができる。 In the above description, the PMT update of service 1 (ISDB-T (one seg)) is not mentioned, but in the case of one seg, the video component is unlikely to disappear, so this case is ignored.
When the digital broadcast signal received by the first reception system and the second reception system is the ISDB-Tsb system, if the digital broadcast signal received by the first reception system and the second reception system does not include a video signal (service 1 and service 2 have no video component), the broadcast reception control unit 110 instructs the display control unit 108 to stop video display corresponding to both digital broadcast signals. When the display unit 202 is an LCD, the backlight can be turned off, and excessive power consumption can be suppressed.
　音声を切り替える場合、キー入力部２０１を介して行うユーザーによる指示に基づいて、放送受信制御部１１０が、音声切替部１０９を制御し、サービス１、サービス２のどちらの音声をユーザーに提示するか決定する。 When switching audio, the broadcast reception control unit 110 controls the audio switching unit 109 based on an instruction given by the user through the key input unit 201, and which audio of the service 1 or service 2 is presented to the user. decide.
　このように、映像信号が無くなり、例えば音声信号のみが含まれるデジタル放送信号の映像表示処理を停止することで、映像信号を有するデジタル放送信号の映像を拡大表示することができるので、ユーザーは映像を快適に視聴することができる。 In this way, the video signal disappears, and for example, by stopping the video display processing of the digital broadcast signal including only the audio signal, the video of the digital broadcast signal having the video signal can be enlarged and displayed. Can be comfortably viewed.
　（実施例１のバリエーション１）
（静止画が続く場合）
　実施例１のバリエーション１として、２画面表示において共に動画を視聴中に、動画および静止画の２画面表示に切り替わった場合における、本発明の表示画面切り替え処理について説明する。 (Variation 1 of Example 1)
(If still images continue)
As a variation 1 of the first embodiment, a display screen switching process according to the present invention will be described in the case of switching to a two-screen display of a moving image and a still image while viewing both moving images in two-screen display.
　この表示画面切り替え処理を実現するために、検知部１１０ａは、更に、デジタル放送信号の映像が動画か、字幕情報・静止画（字幕を含む／又は含まない）かを検知する機能を備える。この字幕とは、例えば、ニュース、番組情報等の文字情報からなる文字スーパーである。
　ここで、静止画には、単なる風景画や人物画のような静止画だけでなく（字幕を含まない）、字幕が含まれることもある（字幕を含む）。動画か静止画かを検知する方法としては、様々な方法を採用することができる。なお、字幕情報の検知については、後述する。 In order to realize the display screen switching process, the detection unit 110a further includes a function of detecting whether the video of the digital broadcast signal is a moving image or caption information / still image (including / not including caption). This subtitle is a character supermarket composed of character information such as news and program information.
Here, the still image may include not only a still image such as a landscape image or a person image (not including subtitles) but also a subtitle (including subtitles). Various methods can be adopted as a method for detecting whether the image is a moving image or a still image. The detection of caption information will be described later.
　例えば、検知部１１０ａは、ＰＭＴのビデオデコードコントロール記述子の記載内容を参照する。デジタル放送信号に含まれる映像信号の映像が静止画の場合、ＰＭＴのビデオデコードコントロール記述子に記載されているstill_picture_flagが１となる。他にも、検知部１１０ａは、マルチメディアデコーダＸ１０６、Ｙ１０７が入力映像データのフォーマット、データ内容を解析して放送受信制御部１１０に静止画であることを通知してもよい。また、検知部１１０ａは、マルチメディアデコーダＸ１０６、Ｙ１０７内のメモリに映像デコードの結果得られる静止画の映像信号、例えば、３２０×１８０のビットマップデータの各ピクセルデータを、一定時間（数秒から数十秒）をおいて記憶する。そして、検知部１１０ａは、一定時間を置いて記憶されている２つのビットマップデータのピクセルデータの差分を検出し、差分が無い場合は静止画と判断してもよい。
　この検知部１１０ａは、受信中のデジタル放送信号から新たな画像などの情報が得られるかどうかを、デジタル放送信号の映像が動画か、字幕情報・静止画（字幕を含む／又は含まない）かを検知することにより判断する判断部である。 For example, the detection unit 110a refers to the description content of the video decoding control descriptor of the PMT. When the video of the video signal included in the digital broadcast signal is a still image, still_picture_flag described in the PMT video decode control descriptor is 1. In addition, the detection unit 110a may notify the broadcast reception control unit 110 that the multimedia decoders X106 and Y107 analyze the format and data content of the input video data and that the broadcast reception control unit 110 is a still image. In addition, the detection unit 110a stores, in a memory within the multimedia decoders X106 and Y107, each pixel data of a still image video signal obtained as a result of video decoding, for example, 320 × 180 bitmap data, for a predetermined time (several seconds to several seconds). 10 seconds) and remember. And the detection part 110a may detect the difference of the pixel data of the two bitmap data memorize | stored after fixed time, and when there is no difference, you may judge that it is a still image.
This detection unit 110a determines whether or not information such as a new image can be obtained from the digital broadcast signal being received, whether the video of the digital broadcast signal is a moving image, caption information / still image (including / not including caption) It is a judgment part which judges by detecting.
　表示制御部１０８は、検知部１１０ａが、受信中のデジタル放送信号に含まれる映像信号の映像が静止画であることを検知すると、表示部２０２に複数の映像を表示している場合、一定時間経過後に、静止画の映像表示処理を停止すると共に、動画の映像を表示部２０２に拡大表示する。この一定時間とは、数秒から数十秒、ユーザーが静止画から情報を得るのに十分な時間である。なお、この場合、静止画の映像表示処理を停止しているのであって、デジタル放送信号の受信は継続している。 When the detection unit 110a detects that the video signal included in the digital broadcast signal being received is a still image, the display control unit 108 displays a plurality of videos on the display unit 202 for a certain period of time. After the elapse of time, the video display processing of the still image is stopped and the video of the moving image is enlarged and displayed on the display unit 202. This fixed time is a time sufficient for a user to obtain information from a still image for several seconds to several tens of seconds. In this case, the video display processing of the still image is stopped, and the reception of the digital broadcast signal is continued.
　図３、図４は、このような表示画面切り替え処理を説明するフロー図である。
　図３のフロー図において、ステップＳ１１～ステップＳ１７の処理は、図２のステップＳ１～ステップＳ７と同じであり、図４のフロー図において、ステップＳ２２，Ｓ２３の処理は、図２のステップＳ９，Ｓ１０と同じなのでその説明を省略する。 3 and 4 are flowcharts for explaining such display screen switching processing.
In the flowchart of FIG. 3, the processes of steps S11 to S17 are the same as those of steps S1 to S7 of FIG. 2, and in the flowchart of FIG. 4, the processes of steps S22 and S23 are the same as steps S9 and S9 of FIG. Since it is the same as S10, its description is omitted.
　検知部１１０ａは、ＰＭＴが更新されたことを検知し（ステップＳ１２／ＹＥＳ）、更に、このＰＭＴを含むデジタル放送信号に映像信号が有ることを検知すると（ステップＳ１３／映像信号が有るデジタル放送信号を検知）、この映像信号の映像が静止画か否かを判定する（ステップＳ１８）。 The detection unit 110a detects that the PMT has been updated (step S12 / YES), and further detects that there is a video signal in the digital broadcast signal including the PMT (step S13 / digital broadcast signal having the video signal). It is determined whether or not the video of the video signal is a still image (step S18).
　静止画の場合（ステップＳ１８／ＹＥＳ）、検知部１１０ａは、２画面表示中か否かを判定する（ステップＳ１９）。
　２画面表示中の場合（ステップＳ１９／ＹＥＳ）、表示制御部１０８は、一定時間経過後、静止画の表示処理を停止し（ステップＳ２０）、ステップＳ１６に移る。 In the case of a still image (step S18 / YES), the detection unit 110a determines whether two screens are being displayed (step S19).
If two screens are being displayed (step S19 / YES), the display control unit 108 stops the still image display process after a predetermined time has elapsed (step S20), and proceeds to step S16.
　静止画でない場合（ステップＳ１８／ＮＯ）、検知部１１０ａは、２画面表示中か否かを判定する（ステップＳ２１）。
　２画面表示中の場合（ステップＳ２１／ＹＥＳ）、ステップＳ１７に移る。２画面表示中でない場合（ステップＳ２１／ＮＯ）、ステップＳ２２に移る。 When the image is not a still image (step S18 / NO), the detection unit 110a determines whether or not two screens are being displayed (step S21).
When two screens are being displayed (step S21 / YES), the process proceeds to step S17. When the two screens are not being displayed (step S21 / NO), the process proceeds to step S22.
　このように、静止画を一定時間表示した後、この静止画の表示処理を停止し、動画を拡大表示することで、ユーザーに対してよりよい視聴環境を提供できる。このとき、静止画は、一定時間表示されるので、ユーザーがこの静止画を見逃す可能性を極力低くすることができる。
　なお、表示制御部１０８は、静止画の表示処理を停止している間に、ユーザーからのキー操作に基づき、この静止画の表示処理を再開してもよい。
　上記の処理は、初めから動画と静止画の２画面表示の場合にも適用できることは言うまでもない。 Thus, after displaying a still image for a certain period of time, the still image display processing is stopped, and the moving image is displayed in an enlarged manner, thereby providing a better viewing environment for the user. At this time, since the still image is displayed for a certain period of time, the possibility that the user misses the still image can be minimized.
The display control unit 108 may restart the still image display process based on a key operation from the user while the still image display process is stopped.
It goes without saying that the above processing can also be applied to the case of two-screen display of a moving image and a still image from the beginning.
　ところで、静止画の表示処理を停止している間に、この静止画の内容が更新されることがあり、ユーザーは、更新された静止画の内容を知る必要がある。特に、静止画に字幕が含まれている場合において、字幕の内容が更新された場合には、ユーザーは、更新された字幕の内容を知る必要がある。そこで、本発明に係るデジタル放送受信装置１は、更新後の静止画の内容を表示する。 Incidentally, while still image display processing is stopped, the content of this still image may be updated, and the user needs to know the updated content of the still image. In particular, when subtitles are included in a still image, if the subtitle content is updated, the user needs to know the updated subtitle content. Therefore, the digital broadcast receiving apparatus 1 according to the present invention displays the contents of the updated still image.
　この表示処理を実現するために、検知部１１０ａは、更に、静止画が更新されたか否かを検知する機能を備える。なお、この静止画が更新されたか否かを検知する方法としては、前述したように、検知部１１０ａが、マルチメディアデコーダＸ１０６、Ｙ１０７内のメモリに映像デコードの結果得られる３２０×１８０のビットマップデータの各ピクセルデータを、一定時間をおいて記憶し、一定時間を置いて記憶されている２つのビットマップデータのピクセルデータの差分を検知し、差分が有る場合は、静止画が更新されたと判断する方法がある。 In order to realize this display processing, the detection unit 110a further has a function of detecting whether or not a still image has been updated. As a method for detecting whether or not this still image has been updated, as described above, the detection unit 110a obtains a 320 × 180 bitmap obtained as a result of video decoding in the memory in the multimedia decoders X106 and Y107. Each pixel data of the data is stored after a certain time, and the difference between the pixel data of two bitmap data stored after a certain time is detected, and if there is a difference, the still image is updated. There is a way to judge.
　表示制御部１０８は、検知部１１０ａが、映像表示処理を停止している静止画が更新されたことを検知すると、拡大表示中の映像を縮小表示すると共に、静止画の映像表示処理を再開する。 When the detection unit 110a detects that the still image for which the video display process has been stopped has been updated, the display control unit 108 displays the enlarged video in a reduced size and restarts the still image video display process. .
　図５は、このような表示画面切り替え処理を説明するフロー図である。
　以下の説明では、図３、図４のフロー図で説明したように、静止画の表示処理を停止し動画の映像のみが表示されている状態であるとする。
　ステップＳ３１において、検知部１１０ａは、表示停止中の静止画が更新されたか否かを監視する。静止画が更新されたことを検知すると（ステップＳ３２／ＹＥＳ）、次に、２画面表示中か否かを判定する（ステップＳ３３）。 FIG. 5 is a flowchart for explaining such display screen switching processing.
In the following description, as described with reference to the flowcharts of FIGS. 3 and 4, it is assumed that the still image display process is stopped and only the video image is displayed.
In step S31, the detection unit 110a monitors whether a still image whose display is stopped has been updated. When it is detected that the still image has been updated (step S32 / YES), it is next determined whether or not two screens are being displayed (step S33).
　前述の例では、静止画の映像表示を停止し動画の映像のみが表示されている状態、即ち、１画面表示中なので（ステップ３３／ＮＯ）、表示制御部１０８は、表示中の動画映像を縮小表示し（ステップＳ３４）、静止画の表示処理を開始する（ステップＳ３５）。そして、表示制御部１０８は、一定時間経過後、静止画の表示処理を停止し（ステップＳ３６）、表示中の動画の映像を拡大表示する（ステップＳ３７）。 In the above-described example, since the still image video display is stopped and only the video image is displayed, that is, since one screen is being displayed (step 33 / NO), the display control unit 108 displays the displayed video image. The reduced image is displayed (step S34), and the still image display process is started (step S35). Then, the display control unit 108 stops the still image display processing after a predetermined time has elapsed (step S36), and enlarges and displays the moving image being displayed (step S37).
　（実施例１のバリエーション２）
　ところで、静止画の表示処理を停止している間に、この静止画の映像信号を含むデジタル放送信号に、新たに臨時ニュース等の字幕情報（文字スーパーとも言う）が含まれることがある。このように、新たに字幕情報を含むデジタル放送信号を受信すると、ユーザーはこの字幕情報を知る必要があるので、本発明に係るデジタル放送受信装置１は、字幕情報の内容を表示する。 (Variation 2 of Example 1)
By the way, while the still image display processing is stopped, the digital broadcast signal including the still image video signal may newly include subtitle information (also referred to as text super) such as extraordinary news. As described above, when a digital broadcast signal including subtitle information is newly received, the user needs to know the subtitle information. Therefore, the digital broadcast receiving apparatus 1 according to the present invention displays the content of the subtitle information.
　この字幕情報の表示処理を実現するために、検知部１１０ａは、更に、受信中のデジタル放送信号に字幕情報が含まれているか否かを検知する機能を備える。なお、受信中のデジタル放送信号に字幕情報が含まれているか否かを検知する方法としては、例えば、デジタル放送信号に含まれる字幕ＥＳを検知する方法がある。 In order to realize the display processing of the caption information, the detection unit 110a further has a function of detecting whether or not caption information is included in the digital broadcast signal being received. As a method for detecting whether or not caption information is included in the digital broadcast signal being received, for example, there is a method for detecting a caption ES included in the digital broadcast signal.
　表示制御部１０８は、検知部１１０ａが、映像表示処理を停止している静止画の映像信号を含むデジタル放送信号に字幕情報が含まれていることを検知すると、拡大表示中の映像を縮小表示すると共に、このデジタル放送信号に含まれる字幕情報を表示する。字幕情報に変化がない場合には、表示制御部１０８は、一定時間経過後に１画面表示に移行する。 When the detection unit 110a detects that the subtitle information is included in the digital broadcast signal including the video signal of the still image for which the video display process has been stopped, the display control unit 108 displays the enlarged video in a reduced size. At the same time, the subtitle information included in the digital broadcast signal is displayed. When there is no change in the caption information, the display control unit 108 shifts to a one-screen display after a predetermined time has elapsed.
　（実施例１のバリエーション３）
　ＰＭＴだけでなく、番組情報が記載されるＥＩＴ(Event Information Table)等のＰＭＴ以外の放送ＴＳ中のデータを参照して、デジタル放送信号における映像信号の有無を検知してもよい。この場合、検知部１１０ａは、ＥＩＴの番組情報を参照し映像がない放送であることを示す文字列等の情報を検知した場合、受信中のデジタル放送信号に映像信号が無いと判定する。
　このように、ＰＭＴやＥＩＴ等のＰＳＩ／ＳＩ情報に基づき、表示画面切り替え処理を実行することで、番組放送時間単位での切り替えが可能になり、ユーザーの利便性が増す。 (Variation 3 of Example 1)
The presence or absence of a video signal in a digital broadcast signal may be detected by referring to data in a broadcast TS other than the PMT, such as an EIT (Event Information Table) in which program information is described, as well as the PMT. In this case, when detecting information such as a character string indicating that the broadcast has no video by referring to the EIT program information, the detection unit 110a determines that there is no video signal in the received digital broadcast signal.
Thus, by executing the display screen switching process based on PSI / SI information such as PMT and EIT, switching in units of program broadcast time becomes possible, and the convenience for the user increases.
　（実施例２）
（受信状態が悪い場合）
　実施例２では、受信中のデジタル放送信号の受信品質値に基づき、表示画面切り替え処理を実行するデジタル放送受信装置について説明する。このデジタル放送受信装置は、図１で説明した機能ブロック図と同構成の機能ブロックを備える。 (Example 2)
(When reception is bad)
In the second embodiment, a digital broadcast receiving apparatus that executes display screen switching processing based on the reception quality value of a digital broadcast signal being received will be described. This digital broadcast receiving apparatus includes functional blocks having the same configuration as the functional block diagram described in FIG.
　図１で説明したチューナーＸ１０４、チューナーＹ１０５は、受信したデジタル放送信号の受信品質値を示すＣＮ値を放送受信制御部１１０に出力する。他にも、受信品質値を示す情報として、ＲＳＳＩ値（受信信号強度：Received Signal Strength Indicator）、ビットエラーレート等がある。 The tuner X104 and the tuner Y105 described in FIG. 1 output a CN value indicating the reception quality value of the received digital broadcast signal to the broadcast reception control unit 110. In addition, as information indicating the reception quality value, there are an RSSI value (Received Signal Strength: Received Signal Strength Indicator), a bit error rate, and the like.
　放送受信制御部１１０の検知部１１０ａは、このＣＮ値に基づき、受信中のデジタル放送信号の受信品質値を検知する。
　この検知部１１０ａは、受信中のデジタル放送信号から新たな画像などの情報が得られるかどうかを、受信中のデジタル放送信号の受信品質値を検知することにより判断する判断部である。
　表示制御部１０８は、検知部１１０ａが検知した受信中のデジタル放送信号の受信品質値に基づき、表示部２０２における映像の表示数、および、表示領域を制御する。 The detection unit 110a of the broadcast reception control unit 110 detects the reception quality value of the digital broadcast signal being received based on this CN value.
The detection unit 110a is a determination unit that determines whether information such as a new image can be obtained from the digital broadcast signal being received by detecting the reception quality value of the digital broadcast signal being received.
The display control unit 108 controls the display number and display area of the video on the display unit 202 based on the reception quality value of the digital broadcast signal being received detected by the detection unit 110a.
　上記処理について具体的に説明する。検知部１１０ａは、チューナーＸ１０４から入力されるデジタル放送信号のＣＮ値を、時間間隔をおいてメモリ１１２に記憶する。同じく、検知部１１０ａは、チューナーＹ１０５から入力されるデジタル放送信号のＣＮ値を、時間間隔をおいてメモリ１１２に記憶する。
　この時間間隔は、数１００ｍｓに設定され、検知部１１０ａは、タイマ１１１から供給されるタイマ資源に基づき、メモリ１１２に対する記憶処理を実行する。 The above process will be specifically described. The detection unit 110a stores the CN value of the digital broadcast signal input from the tuner X104 in the memory 112 with a time interval. Similarly, the detection unit 110a stores the CN value of the digital broadcast signal input from the tuner Y105 in the memory 112 with a time interval.
The time interval is set to several hundreds of milliseconds, and the detection unit 110a executes a storage process for the memory 112 based on the timer resource supplied from the timer 111.
　そして、検知部１１０ａは、メモリ１１２に記憶されたチューナーＸ１０４から入力されるデジタル放送信号のＣＮ値の平均値（移動平均値とも言う）を算出し、平均値が所定値（閾値）未満か否かを判定する。そして、ＣＮ値の平均値が所定値未満の場合、表示制御部１０８は、チューナーＸ１０４から入力されるデジタル放送信号は、所定の受信品質を満たさず、このデジタル放送信号の映像は表示不可能であるとして、このデジタル放送信号の映像表示処理を停止する。 Then, the detection unit 110a calculates an average value (also referred to as a moving average value) of the CN value of the digital broadcast signal input from the tuner X104 stored in the memory 112, and whether the average value is less than a predetermined value (threshold value). Determine whether. When the average value of the CN values is less than the predetermined value, the display control unit 108 cannot display the video of the digital broadcast signal because the digital broadcast signal input from the tuner X104 does not satisfy the predetermined reception quality. If there is, the video display processing of this digital broadcast signal is stopped.
　同じく、検知部１１０ａは、メモリ１１２に記憶されたチューナーＹ１０５から入力されるデジタル放送信号のＣＮ値の平均値を算出し、平均値が所定値未満か否かを判定する。そして、ＣＮ値の平均値が所定値未満の場合、表示制御部１０８は、チューナーＹ１０５から入力されるデジタル放送信号は、所定の受信品質を満たさず、このデジタル放送信号の映像は表示不可能であるとして、このデジタル放送信号の映像表示処理を停止する。 Similarly, the detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner Y105 stored in the memory 112, and determines whether the average value is less than a predetermined value. When the average value of the CN values is less than the predetermined value, the display control unit 108 does not satisfy the predetermined reception quality of the digital broadcast signal input from the tuner Y 105, and the video of the digital broadcast signal cannot be displayed. If there is, the video display processing of this digital broadcast signal is stopped.
　上記表示画面切り替え処理は、例えば、図６に示す表示画面切り替えテーブルに基づいて実行することができる。
　表示画面切り替えテーブル５０は、表示状態欄５１、判定結果欄５２を有する。
　表示状態欄５１は、現時点において１画面表示中か、２画面表示中か、非表示かを示す画面表示状態が記録されている。例えば、１画面表示中の場合、チューナーＸ１０４から入力されるデジタル放送信号に含まれる映像信号の映像（サービス１）を表示し、チューナーＹ１０５から入力されるデジタル放送信号に含まれる映像信号の映像（サービス２）が非表示であることが記録されている。表示画面切り替えテーブル５０は、例えば、メモリ１１２に記憶されている。 The display screen switching process can be executed based on, for example, a display screen switching table shown in FIG.
The display screen switching table 50 has a display state column 51 and a determination result column 52.
The display state column 51 records a screen display state indicating whether one screen is currently displayed, two screens are displayed, or not displayed. For example, when one screen is being displayed, the video signal (service 1) included in the digital broadcast signal input from the tuner X104 is displayed, and the video signal included in the digital broadcast signal input from the tuner Y105 (service 1). It is recorded that service 2) is hidden. The display screen switching table 50 is stored in the memory 112, for example.
　判定結果欄５２は、チューナーＸ１０４から入力されるデジタル放送信号の受信品質値が、所定値以上／所定値未満であり、このデジタル放送信号の映像（サービス１）が表示可能／表示不可能であること、同じく、チューナーＹ１０５から入力されるデジタル放送信号の受信品質値が、所定値以上／所定値未満であり、このデジタル放送信号の映像（サービス２）が表示可能／表示不可能であることが記録されている。 In the determination result column 52, the reception quality value of the digital broadcast signal input from the tuner X104 is not less than a predetermined value / less than the predetermined value, and the video (service 1) of this digital broadcast signal can be displayed / cannot be displayed. Similarly, the reception quality value of the digital broadcast signal input from tuner Y105 is not less than a predetermined value / below the predetermined value, and the video (service 2) of this digital broadcast signal can be displayed / cannot be displayed. It is recorded.
　例えば、現時点で、サービス１が表示中、サービス２が非表示である場合において、検知部１１０ａが、サービス１が表示不可能になり、サービス２が表示可能になったことを検知すると、表示制御部１０８は、画面切替処理（５）に示す、サービス１映像を非表示、サービス２映像を拡大表示する１画面表示を実行する。 For example, when the service 1 is currently displayed and the service 2 is not displayed, the detection unit 110a detects that the service 1 cannot be displayed and the service 2 can be displayed. The unit 108 executes the one-screen display in which the service 1 video is hidden and the service 2 video is enlarged and displayed as shown in the screen switching process (5).
　図７は、受信品質値に基づく表示画面切り替え処理を説明するフロー図である。
　検知部１１０ａは、チューナーＸ１０４から入力されるデジタル放送信号のＣＮ値の平均値を算出し、平均値が所定値未満か否かを判定する（ステップＳ４１）。また、検知部１１０ａは、チューナーＹ１０５から入力されるデジタル放送信号のＣＮ値の平均値を算出し、平均値が所定値未満か否かを判定する（ステップＳ４２）。 FIG. 7 is a flowchart for explaining the display screen switching process based on the reception quality value.
The detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner X104, and determines whether the average value is less than a predetermined value (step S41). In addition, the detection unit 110a calculates the average value of the CN values of the digital broadcast signal input from the tuner Y105, and determines whether the average value is less than a predetermined value (step S42).
　そして、表示制御部１０８は、検知部１１０ａの判定結果と表示画面切り替えテーブル５０に基づき、表示画面切り替え処理を実行する（ステップＳ４３）。
　その後、第１受信系統、第２受信系統から入力される両デジタル放送信号の入力が停止した場合には（ステップＳ４４／ＹＥＳ）、放送受信制御部１１０は、全処理を終了する。デジタル放送信号の入力が継続している場合には（ステップＳ４４／ＮＯ）、ステップＳ４１に戻る。 And the display control part 108 performs a display screen switching process based on the determination result of the detection part 110a, and the display screen switching table 50 (step S43).
Thereafter, when the input of both digital broadcast signals input from the first reception system and the second reception system is stopped (step S44 / YES), the broadcast reception control unit 110 ends all the processes. When the input of the digital broadcast signal is continued (step S44 / NO), the process returns to step S41.
　このようにすることで、ユーザーの移動により放送波の受信状況が刻々と変化する移動体端末における受信状況の変化を、表示画面切り替え処理にリアルタイムに反映させることができる。また、チューナーから得られる受信品質値の移動平均により、表示画面切り替え処理を実行するか否かを判断することで、表示画面の切り替え処理が頻発することを防止できる。 By doing this, it is possible to reflect in real time changes in the reception status at the mobile terminal, where the reception status of the broadcast wave changes every moment as the user moves. Further, it is possible to prevent frequent display screen switching processing by determining whether or not to execute display screen switching processing based on a moving average of reception quality values obtained from a tuner.
　なお、デジタル放送信号の映像が表示可能／表示不可能かを判定する際に参照される所定値（閾値）を自由に調整することができる。例えば、現時点の表示状態が２画面の場合において、デジタル放送信号の映像が表示可能／表示不可能かを判定する際に参照される閾値、即ち、２画面表示から１画面表示への表示画面切り替え処理において参照される閾値と、現時点の表示状態が１画面の場合において、デジタル放送信号の映像が表示可能／表示不可能かを判定する際に参照される閾値、即ち、１画面表示から２画面表示への表示画面切り替え処理において参照される閾値を異ならせることで、表示画面の切り替え処理が頻発することをさらに防止することもできる。例えば、２画面表示から１画面表示への移行時に参照される閾値より、１画面表示から２画面表示への移行時に参照される閾値を大きくする。 It should be noted that the predetermined value (threshold value) that is referred to when determining whether or not the video of the digital broadcast signal can be displayed can be freely adjusted. For example, when the current display state is two screens, a threshold value that is referred to when determining whether a digital broadcast signal image can be displayed or cannot be displayed, that is, a display screen switch from a two-screen display to a one-screen display. Threshold value that is referred to in processing and threshold value that is referred to when determining whether or not a digital broadcast signal image can be displayed when the current display state is one screen, that is, from one screen display to two screens By changing the threshold value referred to in the display screen switching process to display, it is possible to further prevent the display screen switching process from occurring frequently. For example, the threshold value referred to when shifting from the one-screen display to the two-screen display is made larger than the threshold value referred when shifting from the two-screen display to the one-screen display.
　この閾値は、例えば、デジタル放送信号受信時の誤り訂正可能なビット誤り率とすることができる。また、この閾値をビット誤り率よりも小さい値にして、表示画像にブロックノイズが混入する状態を許容してもよい。
　また、検知部１１０ａは、過去数秒間にメモリ１１２に記憶したＣＮ値から平均値を算出してもよい。このように、受信品質値の平均値を算出するのは、ユーザーの移動によりＣＮ値が一時的に急激に低下したり上昇したりする場合の影響を抑えるためである。 This threshold value can be, for example, a bit error rate capable of error correction when receiving a digital broadcast signal. Further, this threshold value may be set to a value smaller than the bit error rate to allow a state in which block noise is mixed in the display image.
Further, the detection unit 110a may calculate an average value from the CN values stored in the memory 112 in the past few seconds. Thus, the average value of the reception quality values is calculated in order to suppress the influence when the CN value temporarily decreases or increases temporarily due to the movement of the user.
　（実施例１、２のバリエーション１）
　本発明の表示画面切り替え処理を、３つ以上の受信系統を備えたデジタル放送受信装置に適用することも可能である。この場合、表示制御部１０８は、検知部１１０ａが、３つ以上の受信系統から入力されるデジタル放送信号の中から映像信号を有さないデジタル放送信号を検知した場合、このデジタル放送信号に対応する映像表示を中止し、映像信号を有するデジタル放送信号に対応する映像を拡大表示する。受信品質値に基づき表示画面切り替え処理を実行する場合も同様である。 (Variation 1 of Examples 1 and 2)
It is also possible to apply the display screen switching process of the present invention to a digital broadcast receiving apparatus provided with three or more receiving systems. In this case, the display control unit 108 corresponds to the digital broadcast signal when the detection unit 110a detects a digital broadcast signal having no video signal from among the digital broadcast signals input from three or more reception systems. The video display is stopped and the video corresponding to the digital broadcast signal having the video signal is enlarged and displayed. The same applies when the display screen switching process is executed based on the reception quality value.
　（実施例１、２のバリエーション２）
　実施例１、２ではISDB-T（ワンセグ），ISDB-Tsb方式の受信機能を備えた受信装置に対する適用例を示したが、例えば、地上デジタル放送、ＢＳデジタル放送、ＣＳ放送を受信可能で、複数画面表示機能を備えた受信装置に対して、実施例１、２で説明した本発明の表示画面切り替え処理を適用してもよい。 (Variation 2 of Examples 1 and 2)
In the first and second embodiments, an application example for a receiving device having a receiving function of ISDB-T (One Seg) and ISDB-Tsb is shown. For example, terrestrial digital broadcasting, BS digital broadcasting, and CS broadcasting can be received. You may apply the display screen switching process of this invention demonstrated in Example 1, 2 with respect to the receiver provided with the multiple screen display function.
１…デジタル放送受信装置、１０１…アンテナＸ、１０２…アンテナＹ、１０３…アンテナ切替部、１０４…チューナーＸ、１０５…チューナーＹ、１０６…マルチメディアデコーダＸ、１０７…マルチメディアデコーダＹ、１０８…表示制御部、１０９…音声切替部、１１０…放送受信制御部、１１０ａ…検知部、１１１…タイマ、１１２…メモリ、２…携帯電話機、２０１…キー入力部、２０２…表示部、２０３…アンテナＺ、２０４…無線部、２０５…通信機能制御部、２０６…音声復号部、２０７…音声符号化部、２０８…スピーカ、２０９…マイク。 DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver, 101 ... Antenna X, 102 ... Antenna Y, 103 ... Antenna switching part, 104 ... Tuner X, 105 ... Tuner Y, 106 ... Multimedia decoder X, 107 ... Multimedia decoder Y, 108 ... Display Control unit 109 ... Audio switching unit 110 110 Broadcast reception control unit 110a ... Detection unit 111 ... Timer 112 ... Memory 2 ... Cellular phone 201 ... Key input unit 202 ... Display unit 203 ... Antenna Z 204: wireless unit, 205: communication function control unit, 206: speech decoding unit, 207: speech encoding unit, 208: speaker, 209: microphone.

Claims (6)

  1. 　複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、
    　前記表示部に表示する表示映像を制御する表示制御部と、
    　受信中のデジタル放送信号から新たな情報が得られるかどうかを判断する判断部を備え、
    　前記表示制御部は、前記判断部による判断により、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置。     In a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on one display unit,
    A display control unit for controlling a display image displayed on the display unit;
    A determination unit for determining whether new information can be obtained from the digital broadcast signal being received;
    The display control unit controls a display number and a display area of an image on the display unit based on a determination by the determination unit.
  2. 　複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、
    　前記表示部に表示する表示映像を制御する表示制御部と、
    　デジタル放送信号に含まれる、映像信号の有無情報が記録されたテーブルに基づき、受信中のデジタル放送信号における映像信号の有無を検知する検知部を備え、
    　前記表示制御部は、前記検知部による受信中のデジタル放送信号における映像信号の有無の検知により、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置。     In a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on one display unit,
    A display control unit for controlling a display image displayed on the display unit;
    Based on a table in which the presence / absence information of a video signal included in the digital broadcast signal is recorded, the detection unit detects the presence / absence of the video signal in the received digital broadcast signal
    The display control unit controls the display number and display area of video on the display unit by detecting the presence or absence of a video signal in the digital broadcast signal being received by the detection unit. .
  3. 　前記検知部は、更に、デジタル放送信号の映像が動画か、字幕情報か、静止画（字幕を含む／又は含まない）かを検知する機能を有し、
    　前記表示制御部は、前記検知部が、受信中のデジタル放送信号に含まれる映像信号の映像が前記字幕情報又は前記静止画であることを検知すると、一定時間経過後に、当該字幕情報又は当該静止画の映像表示処理を停止すると共に、表示している動画の映像を前記表示部に拡大表示することを特徴とする請求項２に記載のデジタル放送受信装置。     The detection unit further has a function of detecting whether the video of the digital broadcast signal is a moving image, subtitle information, or a still image (including / not including subtitles),
    When the detection unit detects that the video of the video signal included in the digital broadcast signal being received is the caption information or the still image, the display control unit detects the caption information or the still image after a predetermined time has elapsed. The digital broadcast receiving apparatus according to claim 2, wherein the video display processing of the image is stopped and the video of the moving image being displayed is enlarged and displayed on the display unit.
  4. 　前記検知部は、更に、前記静止画の映像信号をメモリに記憶し、前記メモリに記憶された前記静止画の映像信号の差分を検知する機能を備え、
    　前記表示制御部は、前記検知部が、前記静止画の映像信号の差分を検知すると、拡大表示中の映像を縮小表示すると共に、静止画の映像表示処理を再開することを特徴とする請求項３に記載のデジタル放送受信装置。     The detection unit further includes a function of storing a video signal of the still image in a memory and detecting a difference between the video signals of the still image stored in the memory,
    The display control unit, when the detection unit detects a difference in the video signal of the still image, displays the enlarged image in a reduced size and restarts the still image video display process. 3. The digital broadcast receiving apparatus according to 3.
  5. 　複数の受信系統から入力される複数のデジタル放送信号に対応する複数の映像を１つの表示部に表示するデジタル放送受信装置において、
    　前記表示部に表示する表示映像を制御する表示制御部と、
    　受信したデジタル放送信号のＣＮ値、ＲＳＳＩ値、ビットエラーレート等の中の何れかの値に基づき、受信中のデジタル放送信号の受信品質値を検知する検知部を備え、
    　前記表示制御部は、前記検知部が検知した受信中のデジタル放送信号の受信品質値に基づき、前記表示部における映像の表示数、および、表示領域を制御することを特徴とするデジタル放送受信装置。     In a digital broadcast receiving apparatus that displays a plurality of videos corresponding to a plurality of digital broadcast signals input from a plurality of reception systems on one display unit,
    A display control unit for controlling a display image displayed on the display unit;
    A detection unit that detects the reception quality value of the digital broadcast signal being received based on any one of the CN value, RSSI value, bit error rate, etc. of the received digital broadcast signal,
    The display control unit controls a display number and a display area of video on the display unit based on a reception quality value of a digital broadcast signal being received detected by the detection unit. .
  6. 　デジタル放送信号の受信品質値を、時間間隔を置いて記憶するメモリを備え、
    　前記検知部は、前記メモリに記憶された受信品質値の平均値を、デジタル放送信号の受信品質値とすることを特徴とする請求項５に記載のデジタル放送受信装置。
          It has a memory to store the reception quality value of the digital broadcast signal at time intervals,
    6. The digital broadcast receiving apparatus according to claim 5, wherein the detection unit uses an average value of reception quality values stored in the memory as a reception quality value of a digital broadcast signal.
PCT/JP2011/054720 2010-03-17 2011-03-02 Digital broadcast reception device provided with function of displaying multiple screens WO2011114881A1 (en)

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JPH03121528A (en) * 1989-10-04 1991-05-23 Nec Corp Power source control system for image display device
JPH0591487A (en) * 1991-09-25 1993-04-09 Casio Comput Co Ltd Broadcasting receiver
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JPH09326987A (en) * 1996-06-07 1997-12-16 Sanyo Electric Co Ltd Digital broadcast receiver
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