CN107786892A - A kind of method, apparatus and readable storage medium storing program for executing for broadcasting DTV - Google Patents
A kind of method, apparatus and readable storage medium storing program for executing for broadcasting DTV Download PDFInfo
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- CN107786892A CN107786892A CN201711038507.6A CN201711038507A CN107786892A CN 107786892 A CN107786892 A CN 107786892A CN 201711038507 A CN201711038507 A CN 201711038507A CN 107786892 A CN107786892 A CN 107786892A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 70
- 230000000052 comparative effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000032798 delamination Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000284 extract Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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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
- H04N21/44—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
-
- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
-
- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention discloses a kind of method, apparatus and readable storage medium storing program for executing for broadcasting DTV.The present invention receives the current television signal that wireless transmission end is transmitted by two-way stratum；The signal intensity of the current television signal is detected, obtains signal strength detection result；The signal strength scale of the current television signal is determined according to the signal strength detection result, video resolution rank corresponding with the signal strength scale is extracted from the current television signal according to the signal strength scale, resolution video corresponding with the video resolution rank is obtained according to the video resolution rank to realize that DTV plays, the present invention is under the same program that DTV needs broadcast, suitable resolution ratio can be automatically switched to according to the signal strength scale of current television signal, and then solve the problems, such as satellite pot TV signal is weak in inclement weather or even can not play.
Description
Technical field
The present invention relates to TV technology, more particularly to a kind of method, apparatus and readable storage for broadcasting DTV
Medium.
Background technology
Satellite pot can be used in places such as hotel, scientific research institution, schools, can also be widely applied to rural area popularization numeral
In the national policy such as TV Rural areas.
Satellite pot is a metal parabola, satellite-signal can be reflexed to positioned at satellite antenna focal point feed and
In tuner, the small-signal transmitted by satellite is collected, carries out the rating of TV.In general, satellite pot bore is bigger, program
Signal it is stronger, the quality of reception is higher.But require that satellite pot bore is the smaller the better in view of factor, users such as cost, installations, from
And the limited strength for receiving the signal that satellite transmits occurs.
However, when run into the cloudy day or rain, the extreme weather such as snow when, it is original faint due to very thick cloud cover
Signal can exponentially weaken, the TV signal interim card for causing user to receive, or even signal can not be watched completely.
The content of the invention
It is a primary object of the present invention to provide a kind of method, apparatus and readable storage medium storing program for executing for broadcasting DTV, purport
Solving the problems, such as current satellite pot, TV signal is weak in inclement weather or even can not broadcast DTV.
To achieve the above object, the present invention provides a kind of method for broadcasting DTV, the described method comprises the following steps：
Receive the current television signal that DTV wireless transmission end is transmitted by two-way stratum, the current television signal
Including the second TV signal in the first TV signal in the first transmission stratum and the second transmission stratum, the second transmission stratum
Band be wider than it is described first transmission stratum bandwidth；
The signal intensity of second TV signal is detected, to determine the signal intensity of second TV signal
Value；
The signal strength scale of the current television signal is determined according to the signal strength values of second TV signal；
Extracted according to the signal strength scale from first TV signal or second TV signal with it is described
Video resolution rank corresponding to signal strength scale, obtained and the video resolution level according to the video resolution rank
Not corresponding resolution video with realize DTV play.
Preferably, the signal strength values according to second TV signal determine the signal of the current television signal
Strength grade, specifically include：
By the signal strength values of second TV signal compared with preset signal strength threshold value, according to comparative result
Determine the signal strength scale of the current television signal.
Preferably, first TV signal includes the first video resolution rank, the preset signal strength threshold value bag
The first preset signal strength threshold value and the second preset signal strength threshold value are included, the second preset signal strength threshold value is more than described
First preset signal strength threshold value；
Correspondingly, the signal strength values by second TV signal are compared with preset signal strength threshold value,
The signal strength scale of the current television signal is determined according to comparative result, is further comprised：
By the signal strength values of second TV signal compared with preset signal strength threshold value, in the described second electricity
When being less than the first preset signal strength threshold value depending on the signal strength values of signal, judge that the signal of the current television signal is strong
Degree grade is the first signal strength scale；
Correspondingly, it is described according to the signal strength scale from first TV signal or second TV signal
Extraction video resolution rank corresponding with the signal strength scale, obtains according to the video resolution rank and is regarded with described
Resolution video corresponding to frequency resolution levels is specifically included with realizing that DTV plays：
Extracted and first signal strength scale pair from the first TV signal according to first signal strength scale
The the first video resolution rank answered, obtained and the first video resolution rank according to the first video resolution rank
Corresponding resolution video with realize DTV play.
Preferably, it is characterised in that the signal strength scale also includes secondary signal strength grade, the secondary signal
Strength grade is more than first signal strength scale；
Second TV signal includes the second video resolution rank, corresponding to the second video resolution rank
Resolution ratio is more than the resolution ratio corresponding to the first video resolution rank；
Correspondingly, it is described to be chosen and first signal from the first TV signal according to first signal strength scale
First video resolution rank corresponding to strength grade, obtained and first video according to the first video resolution rank
After resolution video corresponding to resolution levels is to realize that DTV plays, methods described also includes：
When the signal strength values for detecting second TV signal are more than the second preset signal strength threshold value, sentence
The signal strength scale of fixed second TV signal is secondary signal strength grade；
Chosen according to the secondary signal strength grade from second TV signal with the secondary signal intensity etc.
Second video resolution rank corresponding to level, obtained and second video resolution according to the second video resolution rank
Resolution video corresponding to rank is to continue to play out the DTV.
Preferably, the first TV signal in the first transmission stratum is passed by QPSK modulation system
It is defeated.
In addition, to achieve the above object, the present invention also provides a kind of device for broadcasting DTV, described device includes：
Memory, processor and the broadcast DTV program that is stored on the memory and can run on the processor, institute
State and broadcast the step of DTV program is arranged for carrying out broadcast DTV method as described above.
In addition, to achieve the above object, the present invention also provides a kind of computer-readable recording medium, described computer-readable
It is stored with storage medium and broadcasts DTV program, the broadcast DTV program realizes as above institute when being executed by processor
The step of method for the broadcast DTV stated.
The current television signal that the present invention transmits wirelessly end and transmitted by two-way stratum by receiving DTV first, its
In, current television signal includes the second TV signal in the first TV signal and the second transmission stratum in the first transmission stratum,
The band of the second transmission stratum is wider than the bandwidth of the first transmission stratum, that is, utilizes the hierarchical modulation principle of DTV
Ensure the TV signal of strong antijamming capability all the way in current television signal in bad weather be present；Then to the described second electricity
Signal intensity depending on signal is detected, to determine the signal strength values of second TV signal；Further according to the described second electricity
Signal strength values depending on signal determine the signal strength scale of the current television signal；Finally according to the signal strength scale
Video resolution corresponding with the signal strength scale is extracted from first TV signal or second TV signal
Rank, to realize that DTV plays.The present invention, can be according to TV under the same program that DTV needs broadcast
The signal strength scale of signal automatically switches to suitable resolution ratio, and then solves satellite pot TV signal in inclement weather
It is weak or even the problem of can not play.
Brief description of the drawings
Fig. 1 is a kind of structure of the device of the broadcast DTV for the hardware running environment that scheme of the embodiment of the present invention is related to
Schematic diagram；
Fig. 2 is a kind of schematic flow sheet for the method first embodiment for broadcasting DTV of the present invention；
Fig. 3 is a kind of schematic flow sheet for the method second embodiment for broadcasting DTV of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Reference picture 1, Fig. 1 are a kind of dress of the broadcast DTV for the hardware running environment that scheme of the embodiment of the present invention is related to
The structural representation put.
As shown in figure 1, the device for broadcasting DTV can include：Processor 1001, such as CPU, communication bus
1002nd, DTV interface 1003, network interface 1004, memory 1005.Wherein, communication bus 1002 is used to realize these groups
Connection communication between part.DTV interface 1003 is used to connect television set.Network interface 1004 can optionally include mark
Wireline interface, the wave point (such as WI-FI interfaces) of standard.Memory 1005 can be high-speed RAM memory.It is described to broadcast numeral
The device characterization of TV is digital television receiving terminal, and described device can be digital television receiver.
It will be understood by those skilled in the art that the described device structure shown in Fig. 1 is not formed broadcasts numeral to described
The restriction of the device of TV, it can include than illustrating more or less parts, either combine some parts or different portions
Part is arranged.
As shown in figure 1, operating system, network communication module, DTV interface can be included in the memory 1005
Module and broadcast DTV program.
In the device shown in Fig. 1, DTV interface 1003 is mainly used in connecting television set, and data are carried out with television set
Communication；Described device calls the broadcast DTV program stored in memory 1005 by processor 1001, and performs following
Operation：
Receive the current television signal that DTV wireless transmission end is transmitted by two-way stratum, the current television signal
Including the second TV signal in the first TV signal in the first transmission stratum and the second transmission stratum, the second transmission stratum
Band be wider than it is described first transmission stratum bandwidth；
The signal intensity of second TV signal is detected, to determine the signal intensity of second TV signal
Value；
The signal strength scale of the current television signal is determined according to the signal strength values of second TV signal；
Extracted according to the signal strength scale from first TV signal or second TV signal with it is described
Video resolution rank corresponding to signal strength scale, obtained and the video resolution level according to the video resolution rank
Not corresponding resolution video with realize DTV play.
Further, described device can call the broadcast DTV journey stored in memory 1005 by processor 1001
Sequence, also perform following operate：
By the signal strength values of second TV signal compared with preset signal strength threshold value, according to comparative result
Determine the signal strength scale of the current television signal.
Further, described device can call the broadcast DTV journey stored in memory 1005 by processor 1001
Sequence, also perform following operate：
By the signal strength values of second TV signal compared with preset signal strength threshold value, in the described second electricity
When being less than the first preset signal strength threshold value depending on the signal strength values of signal, judge that the signal of the current television signal is strong
Degree grade is the first signal strength scale；
Correspondingly, described device can call the broadcast DTV journey stored in memory 1005 by processor 1001
Sequence, also perform following operate：
Extracted and first signal strength scale pair from the first TV signal according to first signal strength scale
The the first video resolution rank answered, obtained and the first video resolution rank according to the first video resolution rank
Corresponding resolution video with realize DTV play.
Further, described device can call the broadcast DTV journey stored in memory 1005 by processor 1001
Sequence, also perform following operate：
When the signal strength values for detecting second TV signal are more than the second preset signal strength threshold value, sentence
The signal strength scale of fixed second TV signal is secondary signal strength grade；
Chosen according to the secondary signal strength grade from second TV signal with the secondary signal intensity etc.
Second video resolution rank corresponding to level, obtained and second video resolution according to the second video resolution rank
Resolution video corresponding to rank is to continue to play out the DTV.
The current television signal that the present embodiment transmits wirelessly end and transmitted by two-way stratum by receiving DTV first,
Wherein, current television signal includes the second TV letter in the first TV signal and the second transmission stratum in the first transmission stratum
Number, the band of the second transmission stratum is wider than the bandwidth of the first transmission stratum, that is, utilizes the hierarchical modulation of DTV
Principle ensures the TV signal that strong antijamming capability all the way in current television signal in bad weather be present；Then to described
The signal intensity of two TV signals is detected, to determine the signal strength values of second TV signal；Further according to described
The signal strength values of two TV signals determine the signal strength scale of the current television signal；Finally according to the signal intensity
Grade extracts video corresponding with the signal strength scale point from first TV signal or second TV signal
Resolution rank, to realize that DTV plays.The present embodiment, can be according to working as in the case where DTV needs the same program that broadcasts
The signal strength scale of preceding TV signal automatically switches to suitable resolution ratio, and then it is electric in inclement weather to solve satellite pot
It is weak or even the problem of can not play depending on signal.
Based on above-mentioned hardware configuration, a kind of embodiment of the method for broadcasting DTV of the present invention is proposed.Reference picture 2, Fig. 2 are
A kind of schematic flow sheet of the first embodiment for the method for broadcasting DTV of the present invention.
S10：Receive the current television signal that DTV wireless transmission end is transmitted by two-way stratum, the TV
Signal includes the second TV signal in the first TV signal and the second transmission stratum in the first transmission stratum, second transmission
The band of stratum is wider than the bandwidth of the first transmission stratum；
It should be noted that the executive agent of the method for the present embodiment can be said apparatus (i.e. digital television receiving terminal)
Processor.
The DTV wireless transmission end can be that DTV propagates relay station or carrier server, certainly, also
There can be the equipment of similar functions for other, the present embodiment is not any limitation as to this.
It will be appreciated that the present embodiment can use layering two-way by using existing DTV hierarchical modulation technology
Transmission stratum is transmitted, so as to realize transmission of the TV signal in different estate.Digital television receiver can receive number
The current television signal that word tv wireless transmitting terminal is transmitted by two-way stratum.Wherein, the two-way stratum is divided into the first transmission
Stratum and the second transmission stratum, the first transmission stratum described in the present embodiment are referred to as low order layer, the second transmission stratum letter
Referred to as high-level, wherein, the high-level band is wider than the bandwidth of the low order layer.Utilize the hierarchical modulation of DTV
Technology, current television signal is transmitted by layering, and the data of the code stream of different estate transmission are different, Ke Yili
Solve as the code stream of two physical network transmissions, i.e., high-level transmitted data on network speed is big but is easily interfered, and low order
The transmitted data on network speed of layer is small but be not readily susceptible to disturb, and two networks have collectively constituted current code stream (or TV
Signal), ensure the transmission of TV signal using differential network.
In the specific implementation, for example according to Integrated Services Digital Broadcasting ISDB specifications, (had altogether in the case of ISDB specifications
13 reception frequency ranges, i.e. 13Segment), the TV signal (i.e. described second TV signal) in high-level uses 64QAM
(Quadrature Amplitude Modulation, phase quadrature amplitude modulation) mode is modulated, entered using 12Segment
Row transmission, due to 64QAM modulation systems have transmission rate it is very high (in a 6MHz channel, highest can be supported 64QAM
28Mbps hardware circuit solution), and then can ensure that high-level is passed using main bandwidth at daily (when weather environment is normal)
Defeated TV signal, including DTV play HD video (corresponding the second video resolution rank hereinafter) data；
TV signal (i.e. described first TV signal) in low order layer uses QPSK (Quadrature Phase Shift
Keyin, QPSK) mode is modulated, is transmitted using 1Segment, it is have the advantages of QPSK modulation systems
There is the advantages of modulation efficiency is high, strong antijamming capability, first TV signal is also can guarantee that when bad weather
Signal quality；Low order layer only takes up fraction bandwidth, and the first TV signal in low order layer includes the most base that DTV plays
This played data, and the present embodiment increases low clear video in the most basic played data of low order layer and (corresponded to hereinafter
The first video resolution rank) data and voice data.
S20：The signal intensity of second TV signal is detected, to determine the signal of second TV signal
Intensity level；
It will be appreciated that according to Shannon's theorems (the more big then transfer rate of bandwidth is higher, at the same signal to noise ratio lead also can be higher) can
Know, TV signal (i.e. described second TV signal) transfer rate of high-level (the i.e. second transmission stratum) is high, but anti-interference energy
Power is poor, and the bandwidth of low order layer (i.e. first transmission stratum) is small but strong antijamming capability, therefore judges the power of current television signal
Only need to detect big high-level second TV signal in broadband.
S30：By the signal strength values of second TV signal compared with preset signal strength threshold value, described
When the signal strength values of two TV signals are less than the first preset signal strength threshold value, the letter of the current television signal is judged
Number strength grade is the first signal strength scale；
It will be appreciated that the present embodiment can the setting signal intensity threshold in the Default Value of described device in advance, will
The signal strength detection result of current television signal compared with preset signal strength threshold value,
Wherein, the preset signal strength threshold value includes the first preset signal strength threshold value and the second preset signal strength threshold
Value, the second preset signal strength threshold value are more than the first preset signal strength threshold value；
The signal strength scale of the current television signal is determined according to comparative result, the present embodiment can define at least two
Kind signal strength scale：Including the first signal strength scale, sign television signal status is weak signal state；Secondary signal intensity
Grade, sign television signal status are normal signal state, that is to say, that the secondary signal strength grade is more than described first
Signal strength scale.Correspondingly, the present embodiment can also define the 3rd signal strength scale (it is used to characterize television signal status
For no signal condition), the 4th signal strength scale (it is superpower signal condition that it, which is used to characterize television signal status) etc., this reality
Example is applied herein not to repeat.By pre-setting threshold value, current television signal intensity is judged, and then work as basis in subsequent step
The step of signal strength scale of preceding TV signal automatically switches to suitable resolution ratio is prepared.
, such as can in the specific implementation, preset signal strength threshold value can be set by TV producer according to equipment own situation
To set the first preset signal strength threshold value as 17db, the second preset signal strength threshold value is 17.5db, can also be by two
Individual preset signal strength threshold value suitably widens, for example can also be 19db by the second preset signal strength threshold value；Here need
To illustrate that the second preset signal strength threshold value should be more than the first preset signal strength threshold value, could so to work as
Preceding TV signal intensity carries out being cut automatically according to current television signal strength grade in subsequent step S40 again after reaching stable state
The correlation technique link of suitable resolution ratio is changed to, to ensure the accuracy finally operated, is in current television signal intensity
The problem of being not in frequent switching different resolution during critical value.
When run into the cloudy day or rain, the extreme weather such as snow when, if detecting (high-level) second TV signal
Signal intensity is less than 17db, then the signal intensity for showing current television signal is weak signal, i.e., digital television receiver receives
TV signal become weak signal state from original signal normal condition, perform step S40；Certainly, if detecting (high-order
Layer) signal intensity of the second TV signal is not less than 17db, that is, it is constantly in more than the first preset signal strength threshold value
Or in more than the second preset signal strength threshold value, then played out according to normal DTV program, it is not necessary to perform
Step S40.
S40：Extracted according to first signal strength scale from the first TV signal with first signal intensity etc.
First video resolution rank corresponding to level, obtained and first video resolution according to the first video resolution rank
Resolution video corresponding to rank with realize DTV play.
It will be appreciated that video resolution rank can be divided into the first video resolution rank and the second video resolution level
Not, the first video resolution rank is characterized as low clear video described in the present embodiment, and the second video resolution rank is then
It is characterized as HD video.It is the first signal strength scale (i.e. weak signal) according to (detecting) current signal strength, from described
Low clear video (i.e. the first video resolution rank) corresponding with the weak signal is extracted in current television signal, and prosthomere will be worked as
Mesh is realized according to low clear video and played.
It should be noted that the current television signal in the step S10 can be regarded as TV transmission stream
(Transport Stream, abbreviation TS flow), it is a kind of code stream of Moving Picture Experts Group-2, and TS is flowed by one or multi-channel program set
Into per pass program is combined with each other by one or more primary flows and some other streams, including video flowing, audio stream, program are special
Different information flow (PSI) and other packets.Wherein, PSI table has 4 types：Program Association Table (PAT), Program Map Table
(PMT), network information table (NIT) and conditional access table (CAT)；Above-mentioned Program Association Table (PAT), program map in the present embodiment
Table (PMT), network information table (NIT) and conditional access table (CAT) are in low order layer (the i.e. first transmission stratum).
In the specific implementation, DTV wireless transmission end transmission current television signal in, in the second TV signal
HD video be normal video data, and the low clear video data in the first TV signal is then by increasing by one in PMT
Individual Delamination Transmission descriptor, when digital television receiving terminal, which is checked in PMT, the Delamination Transmission descriptor be present, DTV
Receiving terminal can be found according to the Delamination Transmission descriptor corresponding to suitable video resolution rank (low clear or high definition)
Resolution ratio realizes that DTV plays.
In the present embodiment, DTV wireless transmission end can set a layering for some television channels in PMT in advance
Descriptor layer_transmit_descriptor is transmitted, its structure design is as follows：
Above-mentioned code is meant that：
descriptor_tag：The mark of the Delamination Transmission descriptor is represented, is fixed as 0xC0；
descriptor_length：Represent the length of the descriptor；
layer_type：The level where current video (in addition to audio) to be played is represented, when layer_type is set
For 0 when, represent that the video to be played is located at low order layer；When layer_type is arranged to 1, the video position to be played is represented
In high-level.
reserved_future_use：Represent reserved bit.
reference_PID：Represent the PID (Packet of another stratum's video corresponding to the current video to be played
Identifier, identification code).If layer_type is 0 (low order layer), reference_PID is high-level corresponding sound
The PID of video；If layer_type is 1 (high-level), reference_PID is the PID of the corresponding audio frequency and video of low order layer.
In the case of bad weather, when the TV signal that digital television receiver receives is from original normal shape of signal
When state becomes weak signal state (weak signal corresponds to first signal strength scale), digital television receiver, which can detect, works as
Whether the PID for the video that (to be located at low order layer) in the PMT of preceding TV signal (i.e. current TS stream) currently playing is corresponding above-mentioned point
Layer transmission descriptor, is now 1 (high-level), i.e. institute by detecting the layer_type that can be obtained in the Delamination Transmission descriptor
State Delamination Transmission descriptor and be characterized as current television signal and weak signal is become by normal signal intensity；Accordingly, due to layer_
Type is 1, then reference_PID is the PID of low clear video (i.e. the first video resolution rank) corresponding to low price layer, finally
Current video to be played is switched to low clear video corresponding to the reference_PID, you can realize satellite pot in severe day
Conductance causes to remain able to broadcast (low clear video) digital television program in the case that TV signal is weak.
The current television signal that the present embodiment transmits wirelessly end and transmitted by two-way stratum by receiving DTV first,
Wherein, current television signal includes the second TV letter in the first TV signal and the second transmission stratum in the first transmission stratum
Number, the band of the second transmission stratum is wider than the bandwidth of the first transmission stratum, that is, utilizes the hierarchical modulation of DTV
Principle ensures the TV signal that strong antijamming capability all the way in current television signal in bad weather be present；Then to described
The signal intensity of two TV signals is detected, to determine the signal strength values of second TV signal；Again by described second
The signal strength values of TV signal are compared with preset signal strength threshold value, in the signal strength values of second TV signal
During less than the first preset signal strength threshold value, the signal strength scale for judging the current television signal is first signal intensity etc.
Level；Finally extracted according to first signal strength scale from the first TV signal corresponding with first signal strength scale
The first video resolution rank, according to the first video resolution rank obtain with the first video resolution rank pair
The resolution video answered with realize DTV play.The present embodiment is being worked as under the same program that DTV needs broadcast
The state of preceding TV signal automatically switches to suitable low clear video to realize that DTV plays when being weak signal state, and then
Solving the problems, such as satellite pot, TV signal is weak in inclement weather or even can not play.
Further, as shown in figure 3, proposing that the present invention is a kind of based on the inventive method first embodiment broadcasts DTV
Method second embodiment, in the present embodiment, methods described also includes after the step S40：
S50：It is more than the second preset signal strength threshold value in the signal strength values for detecting second TV signal
When, the signal strength scale for judging second TV signal is secondary signal strength grade；
It will be understood that, it is known that the second preset signal strength threshold value is greater than the first preset signal strength threshold value, only
Have when the signal strength values for detecting second TV signal are more than the second preset signal strength threshold value, just perform institute
State judge the signal strength scale of second TV signal for secondary signal strength grade the step of, avoid believing in TV
When number intensity is in critical value it is possible that the problem of frequent switching different resolution, with ensure the accuracy that finally operates and
Validity.
S60：Chosen according to the secondary signal strength grade from second TV signal strong with the secondary signal
The second video resolution rank corresponding to grade is spent, is obtained and second video point according to the second video resolution rank
Resolution video corresponding to resolution rank is to continue to play out the DTV.
It will be appreciated that after actual program is realized into broadcasting according to low clear video, the TV letter is being detected
Number signal intensity when being more than 17.5db (i.e. described second preset signal strength threshold value), then show the signal of current television signal
Intensity is normal signal (secondary signal strength grade), i.e., the TV signal that digital television receiver receives is again from later weak
Signal condition becomes normal signal state, is now normal signal state according to current television signal, from the TV
HD video (the second video resolution rank) corresponding with the normal signal is extracted in signal, and by actual program according to height
Clear video continues to play, so can in fact now due to when weather improvement TV signal intensity returns to normal, can automatically by
Low clear video is switched to HD video, and user need not remove Switch Video resolution levels manually, be brought greatly to user
It is convenient, further increase the experience of user.
In addition, the embodiment of the present invention also proposes a kind of computer-readable recording medium, the computer-readable recording medium
On be stored with the program for broadcasting DTV, the program for broadcasting DTV realizes following operation when being executed by processor：
Receive the current television signal that DTV wireless transmission end is transmitted by two-way stratum, the current television signal
Including the second TV signal in the first TV signal in the first transmission stratum and the second transmission stratum, the second transmission stratum
Band be wider than it is described first transmission stratum bandwidth；
The signal intensity of second TV signal is detected, to determine the signal intensity of second TV signal
Value；
The signal strength scale of the current television signal is determined according to the signal strength values of second TV signal；
Extracted according to the signal strength scale from first TV signal or second TV signal with it is described
Video resolution rank corresponding to signal strength scale, obtained and the video resolution level according to the video resolution rank
Not corresponding resolution video with realize DTV play.
Further, following operation is also realized when the program for broadcasting DTV is executed by processor：
By the signal strength values of second TV signal compared with preset signal strength threshold value, according to comparative result
Determine the signal strength scale of the current television signal.
Further, following operation is also realized when the program for broadcasting DTV is executed by processor：
By the signal strength values of second TV signal compared with preset signal strength threshold value, in the described second electricity
When being less than the first preset signal strength threshold value depending on the signal strength values of signal, judge that the signal of the current television signal is strong
Degree grade is the first signal strength scale.
Correspondingly, following operation is also realized when the program for broadcasting DTV is executed by processor：
Extracted and first signal strength scale pair from the first TV signal according to first signal strength scale
The the first video resolution rank answered, obtained and the first video resolution rank according to the first video resolution rank
Corresponding resolution video with realize DTV play.
Further, following operation is also realized when the program for broadcasting DTV is executed by processor：
When the signal strength values for detecting second TV signal are more than the second preset signal strength threshold value, sentence
The signal strength scale of fixed second TV signal is secondary signal strength grade；
Chosen according to the secondary signal strength grade from second TV signal with the secondary signal intensity etc.
Second video resolution rank corresponding to level, obtained and second video resolution according to the second video resolution rank
Resolution video corresponding to rank is to continue to play out the DTV.
The current television signal that the present embodiment transmits wirelessly end and transmitted by two-way stratum by receiving DTV first,
Wherein, current television signal includes the second TV letter in the first TV signal and the second transmission stratum in the first transmission stratum
Number, the band of the second transmission stratum is wider than the bandwidth of the first transmission stratum, that is, utilizes the hierarchical modulation of DTV
Principle ensures the TV signal that strong antijamming capability all the way in current television signal in bad weather be present；Then to described
The signal intensity of two TV signals is detected, to determine the signal strength values of second TV signal；Further according to described
The signal strength values of two TV signals determine the signal strength scale of the current television signal；Finally according to the signal intensity
Grade extracts video corresponding with the signal strength scale point from first TV signal or second TV signal
Resolution rank, to realize that DTV plays.The present embodiment, can be according to working as in the case where DTV needs the same program that broadcasts
The signal strength scale of preceding TV signal automatically switches to suitable resolution ratio, and then it is electric in inclement weather to solve satellite pot
It is weak or even the problem of can not play depending on signal.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements not only include those key elements, and
And also include the other element being not expressly set out, or also include for this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Other identical element also be present in the process of key element, method, article or system.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, computer, clothes
Be engaged in device, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (7)
- A kind of 1. method for broadcasting DTV, it is characterised in that methods described includes：The current television signal that DTV wireless transmission end is transmitted by two-way stratum is received, the current television signal includes Second TV signal in the first TV signal and the second transmission stratum in first transmission stratum, the band of the second transmission stratum It is wider than the bandwidth of the first transmission stratum；The signal intensity of second TV signal is detected, to determine the signal strength values of second TV signal；The signal strength scale of the current television signal is determined according to the signal strength values of second TV signal；Extracted and the signal from first TV signal or second TV signal according to the signal strength scale Video resolution rank corresponding to strength grade, obtained and the video resolution rank pair according to the video resolution rank The resolution video answered with realize DTV play.
- 2. the method as described in claim 1, it is characterised in that the signal strength values according to second TV signal are true The signal strength scale of the fixed current television signal, is specifically included：By the signal strength values of second TV signal compared with preset signal strength threshold value, determined according to comparative result The signal strength scale of the current television signal.
- 3. method as claimed in claim 2, it is characterised in that first TV signal includes the first video resolution level Not, the preset signal strength threshold value includes the first preset signal strength threshold value and the second preset signal strength threshold value, and described Two preset signal strength threshold values are more than the first preset signal strength threshold value；Correspondingly, the signal strength values by second TV signal are compared with preset signal strength threshold value, according to Comparative result determines the signal strength scale of the current television signal, further comprises：By the signal strength values of second TV signal compared with preset signal strength threshold value, believe in second TV Number signal strength values when being less than the first preset signal strength threshold value, judge signal intensity of the current television signal etc. Level is the first signal strength scale；Correspondingly, it is described to be extracted according to the signal strength scale from first TV signal or second TV signal Video resolution rank corresponding with the signal strength scale, obtained and the video point according to the video resolution rank Resolution video corresponding to resolution rank is specifically included with realizing that DTV plays：Extracted according to first signal strength scale from the first TV signal corresponding with first signal strength scale First video resolution rank, obtained according to the first video resolution rank corresponding with the first video resolution rank Resolution video with realize DTV play.
- 4. method as claimed in claim 3, it is characterised in that characterized in that, the signal strength scale also includes second Signal strength scale, the secondary signal strength grade are more than first signal strength scale；Second TV signal includes the second video resolution rank, the resolution corresponding to the second video resolution rank Rate is more than the resolution ratio corresponding to the first video resolution rank；Correspondingly, it is described to be chosen and first signal intensity from the first TV signal according to first signal strength scale First video resolution rank corresponding to grade, obtained according to the first video resolution rank and differentiated with first video After resolution video corresponding to rate rank is to realize that DTV plays, methods described also includes：When the signal strength values for detecting second TV signal are more than the second preset signal strength threshold value, institute is judged The signal strength scale for stating the second TV signal is secondary signal strength grade；Chosen and the secondary signal strength grade pair from second TV signal according to the secondary signal strength grade The the second video resolution rank answered, obtained and the second video resolution rank according to the second video resolution rank Corresponding resolution video is to continue to play out the DTV.
- 5. the method as described in claim any one of 1-4, it is characterised in that the first TV letter in the first transmission stratum Number it is transmitted by QPSK modulation system.
- 6. a kind of device for broadcasting DTV, it is characterised in that described device includes：Memory, processor and it is stored in institute The broadcast DTV program stated on memory and can run on the processor, the broadcast DTV program are configured to The step of realizing the broadcast DTV method as any one of claim 1 to 5.
- 7. a kind of computer-readable recording medium, it is characterised in that broadcast number is stored with the computer-readable recording medium Word tv program, the broadcast DTV program are realized as any one of claim 1 to 5 when being executed by processor The step of broadcasting the method for DTV.
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| WO2022242362A1 (en) * | 2021-05-19 | 2022-11-24 | Oppo广东移动通信有限公司 | Image data sending method, image data receiving method, terminal, chip, and storage medium |
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