CN111314752B - Low-noise down converter and signal processing method - Google Patents

Low-noise down converter and signal processing method Download PDF

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Publication number
CN111314752B
CN111314752B CN202010138548.8A CN202010138548A CN111314752B CN 111314752 B CN111314752 B CN 111314752B CN 202010138548 A CN202010138548 A CN 202010138548A CN 111314752 B CN111314752 B CN 111314752B
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China
Prior art keywords
down converter
signal
low
frequency band
noise down
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CN111314752A (en
Inventor
莫英强
陈锦鹏
孙功宪
高峰
许祥滨
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Shenzhen Beidou Wanfang Information Technology Co ltd
Techtotop Microelectronics Co Ltd
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Shenzhen Beidou Wanfang Information Technology Co ltd
Techtotop Microelectronics Co Ltd
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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
    • H04N21/41—Structure of client; Structure of client peripherals
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • 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
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The embodiment of the application is suitable for the technical field of signal processing, and provides a low-noise down converter and a signal processing method, wherein the low-noise down converter comprises: the positioning unit is used for receiving positioning signals transmitted by the positioning satellites and identifying whether the low-noise down converter is positioned in a preset area or not according to the positioning signals; the first feed source is used for receiving a first satellite signal transmitted by a first direct broadcast satellite when the low-noise down converter is located in a preset area; the first local oscillation unit is used for mixing the first satellite signals to obtain first intermediate frequency signals belonging to a preset first frequency band; the second feed source is used for receiving a second satellite signal transmitted by a second direct broadcast satellite; the second local oscillation unit is used for mixing the second satellite signals to obtain second intermediate frequency signals belonging to a preset second frequency band. By adopting the method, the supervision of the received television program signals can be realized from the terminal side.

Description

Low-noise down converter and signal processing method
The application claims priority of Chinese application patent application with application date of 2019, 12, 27, application number of 201911377406.0 and name of 'a low noise down converter and a signal processing method'.
Technical Field
The application belongs to the technical field of signal processing, and particularly relates to a low-noise down converter and a signal processing method.
Background
The Low Noise Block (LNB), i.e. the tuner, has the function of amplifying and down-converting the satellite signal transmitted by the feed source, and converting the high frequency signal to an intermediate frequency, so as to facilitate the transmission of the coaxial cable and the demodulation and operation of the satellite receiver.
In certain special areas, regulatory authorities need to limit the area where television programs fall to prevent some unauthorized television programs from being broadcast in that area. However, due to the broadcasting and open characteristics of satellite television signals, the technical difficulty and cost of monitoring television programs in a certain area at a satellite end are high.
Disclosure of Invention
In view of this, the embodiment of the application provides a low-noise down converter and a signal processing method, so as to solve the problem of high difficulty in monitoring television programs in partial areas in the prior art.
A first aspect of an embodiment of the present application provides a low noise down converter, including:
the positioning unit is used for receiving positioning signals transmitted by positioning satellites and identifying whether the low-noise down converter is positioned in a preset area or not according to the positioning signals;
the first feed source is electrically connected with the positioning unit and is used for receiving a first satellite signal transmitted by a first direct broadcast satellite when the low-noise down converter is positioned in a preset area;
the first local oscillator unit is electrically connected with the first feed source and is used for mixing the first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band;
the second feed source is electrically connected with the positioning unit and is independently configured with the first feed source and is used for receiving a second satellite signal transmitted by a second direct broadcast satellite;
and the second local oscillation unit is electrically connected with the second feed source and is used for mixing the second satellite signals to obtain second intermediate frequency signals belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped.
A second aspect of an embodiment of the present application provides a signal processing method, applied to a low noise down converter, including:
the positioning unit of the low-noise down converter is controlled to receive positioning signals transmitted by positioning satellites;
identifying whether the low-noise down converter is located in a preset area according to the positioning signal;
if the low-noise down converter is located in a preset area, a first feed source of the low-noise down converter is controlled to receive a first satellite signal transmitted by a first direct broadcast satellite, the first satellite signal is mixed, and a first intermediate frequency signal belonging to a preset first frequency band is output;
and controlling a second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mixing the second satellite signal, and outputting a second intermediate frequency signal belonging to a preset second frequency band, wherein the first frequency band and the second frequency band are not overlapped.
A third aspect of an embodiment of the present application provides a signal processing apparatus applied to a low noise down converter, the signal processing apparatus including:
the positioning signal receiving module is used for controlling the positioning unit of the low-noise down converter to receive positioning signals transmitted by positioning satellites;
the region identification module is used for identifying whether the low-noise down converter is positioned in a preset region or not according to the positioning signal;
the first frequency mixing module is used for controlling a first feed source of the low-noise down converter to receive a first satellite signal transmitted by a first direct broadcast satellite and mixing the first satellite signal if the low-noise down converter is located in a preset area, and outputting a first intermediate frequency signal belonging to a preset first frequency band;
the second frequency mixing module is used for controlling the second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mixing the second satellite signal and outputting a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other.
A fourth aspect of the embodiments of the present application provides a low noise down converter, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the low noise down converter being the low noise down converter according to the first aspect, the processor implementing the signal processing method according to the second aspect when executing the computer program.
A fifth aspect of an embodiment of the present application provides a computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor of the low noise down converter according to the first aspect to implement the signal processing method according to the second aspect.
A sixth aspect of an embodiment of the present application provides a computer program product for causing a low noise down converter as defined in the first aspect above to perform the signal processing method as defined in the second aspect above when the computer program product is run on the low noise down converter.
Compared with the prior art, the embodiment of the application has the following advantages:
according to the embodiment of the application, the positioning unit is added in the tuner with the plurality of feeds and is used for positioning the position of the tuner, the plurality of feeds are controlled to respectively receive signals transmitted by different direct broadcast satellites only when the position is judged to be in the preset area, and then the intermediate frequency signals meeting the receiving frequency range requirements of the preset set top box can be output through mixing the signals received by the feeds by using different local oscillator units.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic circuit diagram of a low noise down converter according to one embodiment of the present application;
fig. 2 is a schematic diagram of an application scenario of a low noise down converter according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a frequency band division according to an embodiment of the present application;
FIG. 4 is a flow chart illustrating steps of a signal processing method according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an overall architecture of a signal processing method according to an embodiment of the application
FIG. 6 is a schematic diagram of a signal processing apparatus according to one embodiment of the present application;
fig. 7 is a schematic diagram of a low noise down converter in accordance with an embodiment of the application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In some special areas, the broadcasting of satellite television programs is also affected by national relations, geographic locations, urban and rural differences and other factors, so that certain use restrictions exist. For example, in a specific area where the current relationship is complex, satellite television programs in country a are not allowed to be played in country B. However, due to the characteristics of satellite television broadcasting and openness, in the range of the coverage area of the satellite signal, after receiving the satellite television signal, the conventional satellite television receiver can demodulate the television broadcasting through the equipment such as a set top box and the like, so that normal broadcasting is realized.
In order to solve the above problems, the core concept of the present application is that a positioning unit is added in a tuner for receiving a satellite live broadcast signal, the position of the tuner is identified by the positioning unit, if the position belongs to an area where a television program or a broadcast program signal is allowed to be received, a feed source of the tuner is controlled to receive the satellite live broadcast signal, and after the satellite live broadcast signal is processed, a corresponding program is demodulated by a set top box; if the position is not in the area which allows receiving television programs or broadcast program signals, the control tuner does not receive satellite live broadcast signals or does not process the received signals, and the supervision of the satellite live broadcast signals is realized from the terminal side.
The technical scheme of the application is described below through specific examples.
Referring to fig. 1, a schematic circuit structure of a low noise down converter according to an embodiment of the present application may specifically include a positioning unit, a first feed source electrically connected to the positioning unit, a first local oscillator unit electrically connected to the first feed source, a second feed source electrically connected to the positioning unit and configured independently of the first feed source, and a second local oscillator unit electrically connected to the second feed source.
In the embodiment of the application, the positioning unit can be used for receiving the positioning signal transmitted by the positioning satellite and identifying whether the tuner is positioned in the preset area according to the positioning signal. The preset area may refer to an area that allows normal reception of a direct broadcast satellite signal.
In a specific implementation, the information of the preset area may be stored in the tuner in advance by means of an electronic fence. For example, for each area that allows normal reception of direct broadcast satellite signals, latitude and longitude and boundary information of those areas may be stored in the tuner. After the positioning unit receives the positioning signal, the current position information can be obtained by analyzing the positioning signal. Comparing the current position information with the electronic fence information, and if the electronic fence information contains the current position information, judging that the high frequency is positioned in a preset area which allows normal reception of the direct broadcast satellite signal; if the current position information is not contained in the electronic fence information, it can be determined that the position does not allow the reception of the direct broadcast satellite signal.
In this embodiment, the tuner may further include a power control unit, where the power control unit may control the positioning unit to power on and control the first feed source and the second feed source to maintain a power-off state when the tuner is powered on. When the tuner is electrified, the power supply of the positioning unit is firstly switched on, so that the positioning unit can receive the positioning signal and analyze the current position information, and if the current position information belongs to the range of the preset area, the tuner is allowed to normally receive the satellite live broadcast signal. At this time, the power supply control unit can control the first feed source and the second feed source to work in a power-on mode. Of course, when the first feed source and the second feed source are powered on to work, the power supply control unit may disconnect the power supply of the positioning unit, or may keep the positioning unit in the powered on working state, which is not limited in this embodiment.
On the other hand, if the current position information does not belong to the preset area range, it indicates that the tuner is not allowed to receive the satellite live broadcast signal. At this time, the power control unit may control the first feed source and the second feed source to maintain a power-off state.
In this embodiment, multiple feeds in the tuner may receive signals of different direct broadcast satellites respectively. The signals transmitted by different direct broadcast satellites can include both vertical signals and horizontal signals.
Fig. 2 is a schematic diagram of an application scenario of the low noise down converter of the present embodiment. The positioning unit arranged in the tuner can analyze the current position information by receiving signals of a plurality of positioning satellites. When the current position belongs to a preset area, the feed sources of the tuner can respectively receive live broadcast signals of different live broadcast satellites, and after the live broadcast signals carrying television programs or broadcast programs are transmitted to the set top box by the tuner, the live broadcast signals can be played in playing equipment such as a television through demodulation processing of the set top box.
For easy understanding, this embodiment is described by taking the example that the tuner includes two independently configured feeds, i.e., a first feed and a second feed. Of course, it should be understood by those skilled in the art that, according to the solution provided in this embodiment, the number of feeds configured in the tuner may include more feeds, and this embodiment does not limit the number of feeds in the tuner.
In general, in order to fully utilize limited bandwidth resources, a repeater transmits two beams simultaneously, and the two beams are mutually perpendicular to each other and are not mutually interfered. The mutual vertical propagation modes can be divided into linear polarization (vertical and horizontal propagation) and circular polarization (left-handed and right-handed propagation), and the frequency bands are 10.7GHz to 12.75GHz, and the bandwidth is 2.05GHz. Therefore, the bandwidth of one direct broadcast satellite is 4.1GHz in total, and the bandwidth of the two direct broadcast satellites is 8.2GHz in total, regardless of the linear polarization or circular polarization propagation mode. The intermediate frequency band (namely the output frequency band of the tuner) received by the set top box is 950MHz to 2150MHz, the bandwidth is only 1.2GHz, and the 8.5GHz bandwidth received by the tuner is far greater than the 1.2GHz bandwidth receivable by the set top box.
Therefore, in order to enable the two feed sources of the tuner to simultaneously receive the live broadcast signals transmitted by the two live broadcast satellites, the live broadcast signals respectively received by the two feed sources are required to be mixed with different local oscillators to obtain different intermediate frequencies, and the received intermediate frequencies must fall into the receivable frequency band of the set top box.
In this embodiment, after the first satellite signal received by the first feed source is amplified, filtered, and the like, the first satellite signal may be mixed with the electromagnetic wave generated by the first local oscillator unit, so as to obtain a first intermediate frequency signal belonging to the first frequency band.
The first frequency band can be determined according to actual needs. Generally, the first frequency band should be within the range of frequency bands receivable by the set top box, i.e., 950MHz to 2150 MHz. On the other hand, in order to ensure that the second satellite signal received by the second feed source can be located in the frequency range after being processed, and the second satellite signal do not interfere with each other, the 950MHz to 2150MHz range can be divided, so that the first frequency range and the second frequency range are divided into a certain section located in the first frequency range and the second frequency range.
Fig. 3 is a schematic diagram of frequency division according to the present embodiment. According to the division of fig. 3, the first frequency band may be set to a range of 950MHz to 1950MHz, and the second frequency band may be set to a range of 2010MHz to 2150 MHz.
Of course, the above-mentioned frequency range values that can be received by the set-top box are merely an example of this embodiment, and according to the practical situation of the frequency range that can be received by the set-top box, those skilled in the art can flexibly determine specific values of the first frequency range and the second frequency range based on the scheme provided by this embodiment, which is not limited in this embodiment.
After the first frequency range is determined, various parameters of the first local oscillator unit can be set correspondingly, so as to mix the first intermediate frequency signal.
In this embodiment, the tuner further includes a first filter, which is electrically connected to the first local oscillator unit, and may be configured to filter the first intermediate frequency signal, and output the filtered first intermediate frequency signal. That is, the first filter may be a filter matched with the first frequency band, and the intermediate frequency signal of the first frequency band can be ensured to be output by the filtering of the first filter.
In this embodiment, the second local oscillator unit for mixing the second satellite signal may include a plurality of second local oscillator units. As shown in fig. 1, the second local oscillation units include 4 LO1, LO2, LO3 and LO4, and each second local oscillation unit is configured to correspond to one mixing frequency band respectively, and is configured to mix a second satellite signal belonging to the corresponding mixing frequency band, so as to obtain a second intermediate frequency signal belonging to a preset second frequency band.
In a specific implementation, only one of the 4 second local oscillation units can be powered on to work, the other 3 second local oscillation units are in a power-off and non-working state, and the second satellite signals of 10.7GHz to 11.23GHz can be divided into 4 sections through the 4 different local oscillation units and output through a second filter with the bandwidth of 2010MHz to 2150 MHz.
As shown in table one, the table is an example table of the correspondence between the second local oscillation unit and the corresponding mixing frequency band in this embodiment. Each local oscillator unit is configured to correspond to one frequency mixing band, and can output a second intermediate frequency signal belonging to the range of 2010MHz to 2150MHz after frequency mixing processing.
Table one:
second local oscillation unit Mixing frequency band Second intermediate frequency signal
LO1 10.700-10.840GHz 2010-2150MHz
LO2 10.830-10.970GHz 2010-2150MHz
LO3 10.960-11.100GHz 2010-2150MHz
LO4 11.090-11.230GHz 2010-2150MHz
The specific control of which second local oscillation unit works can be determined according to the instruction of the set top box. The set top box sends a control instruction to the tuner, and the tuner determines which local oscillator unit is selected to be electrified to work according to different instructions. The control instruction may be an instruction based on the digital satellite television receiver control protocol diseqc 1.1.
In this embodiment, a second filter electrically connected to the second local oscillation unit may be used to filter the second intermediate frequency signal, and output a filtered second intermediate frequency signal, where the second filter is a filter matched with the second frequency band. That is, the signal belonging to the range of 2010MHz to 2150MHz is output after the filtering by the second filter.
For a tuner including a plurality of feeds, for example, in addition to the first feed and the second feed, a certain tuner includes a third feed for receiving a third satellite signal transmitted by a third direct broadcast satellite. Similarly, a third intermediate frequency signal belonging to a preset third frequency band can be obtained by mixing a third satellite signal through a third local oscillator unit electrically connected with a third feed source, so long as the third frequency band is ensured to be positioned in the receiving frequency band range of the set top box and is not overlapped with the first frequency band and the second frequency band.
Of course, only some of the constituent units of the tuner are described in the above description, and in practical applications, the tuner may further include other processing units. For example, for satellite signals received by the first feed source and the second feed source, an RF (Radio Frequency) amplifier may be used to amplify the satellite signals, and then an image rejection filter may be used to filter the satellite signals and then transmit the satellite signals to a corresponding local oscillator unit for mixing; in addition, for the second intermediate frequency signal outputted by mixing with the second local oscillation unit, before the second intermediate frequency signal is inputted to the second filter for filtering, an IF (Intermediate Frequency, intermediate frequency suppression) amplifier may be used for processing, and so on. As for the complete circuit structure of the tuner of the present embodiment, reference may be made to fig. 1, and this embodiment will not be repeated.
In the embodiment of the application, the positioning unit is added in the tuner with the plurality of feeds and is used for positioning the position of the tuner, the plurality of feeds are controlled to respectively receive signals transmitted by different direct broadcast satellites only when the position is judged to belong to a preset area, and then the intermediate frequency signals meeting the requirement of a preset set top box receiving frequency band can be output by mixing the signals received by the feeds through different local oscillator units.
Referring to fig. 4, a schematic step flow diagram of a signal processing method according to an embodiment of the present application may specifically include the following steps:
s401, controlling a positioning unit of the low-noise down converter to receive positioning signals transmitted by positioning satellites;
it should be noted that the method can be applied to a low noise down converter, i.e. a tuner. The signal processing method described in this embodiment may be implemented in the tuner of the foregoing embodiment, and the description of the foregoing embodiment may be referred to for the specific structure of the tuner, which is not repeated in this embodiment.
In order to achieve proper management of television program content in different areas, so that unauthorized television program content cannot be broadcast in the managed area, the embodiment may first determine whether the tuner is located in an area where satellite live broadcast signals are allowed to be received before receiving signals transmitted by a live broadcast satellite through the tuner.
In a specific implementation, a positioning signal emitted by a positioning satellite can be received through a positioning unit and used for identifying an area where the tuner is located.
It should be noted that the positioning unit may be integrated with the tuner so that the positioning unit is an integral part of the tuner; alternatively, the positioning unit may be separately provided in the form of a positioning device, and then the positioning unit is electrically connected to the tuner, which is not limited in this embodiment.
S402, identifying whether the low-noise down converter is located in a preset area according to the positioning signal;
after receiving the positioning signal, the positioning unit can obtain the position information corresponding to the positioning signal by decoding the positioning signal, and determine the current position of the tuner, thereby judging whether the position is in the range capable of receiving the satellite live broadcast signal.
If the current position is within the range capable of receiving the satellite live broadcast signals, the tuner may execute S403 to control each feed source to respectively receive satellite signals transmitted by the live broadcast satellites.
In a specific implementation, after the position information is obtained by parsing, the position information can be compared with preset electronic fence information. If the preset electronic fence information contains the position information, the tuner can be judged to be positioned in a preset area; otherwise, it is determined that it is not in the preset area.
S403, controlling a first feed source of the low-noise down converter to receive a first satellite signal transmitted by a first direct broadcast satellite, mixing the first satellite signal, and outputting a first intermediate frequency signal belonging to a preset first frequency band;
in this embodiment, when it is determined that the tuner is in a preset area capable of receiving satellite signals transmitted by a direct broadcast satellite, the power supply control unit may control each feed source of the tuner to work in a powered mode, so that each feed source receives satellite direct broadcast signals transmitted by different direct broadcast satellites. For example, a first satellite signal transmitted by a first direct broadcast satellite is received via a first feed, a second satellite signal transmitted by a second direct broadcast satellite is received via a second feed, and so on.
Of course, the tuner in this embodiment may further include a third feed source, a fourth feed source, and the like, where satellite signals transmitted by the third direct broadcast satellite and the fourth direct broadcast satellite are received through the third feed source and the fourth feed source, and the number of feed sources in the tuner is not limited in this embodiment.
In this embodiment, when different feeds are controlled to respectively receive satellite signals transmitted by a plurality of direct broadcast satellites, in order to ensure that the received signals do not interfere with each other and can be normally played in a television after being demodulated by a set top box, the frequency band corresponding to each feed can be determined first. That is, the frequency band of the intermediate frequency signal output by the signal received by each feed after the mixing process is first determined. Typically, the frequency band should fall within the range of frequency bands that the set top box can receive, i.e., the 950MHz to 2150MHz range.
As an example of the present embodiment, the first frequency band may be set to the range of 950MHz to 1950MHz, and the second frequency band may be set to the range of 2010MHz to 2150 MHz. Of course, the above frequency band division is merely an example, and a specific division manner can be selected by a person skilled in the art according to actual needs, which is not limited in this embodiment.
In this embodiment, after the first feed source receives the first direct broadcast satellite signal, the first feed source may mix the first direct broadcast satellite signal, so that the first intermediate frequency signal output after mixing meets the set frequency band range requirement. That is, after mixing the first satellite signal, the output first intermediate frequency signal should be in the range of 950MHz to 1950 MHz.
In a specific implementation, a first local oscillator unit may be used to mix a first satellite signal to obtain a first intermediate frequency signal. In order to ensure that the output first intermediate frequency signals all belong to the first frequency band range, a first filter can be further adopted to filter the first intermediate frequency signals, the filtered first intermediate frequency signals are output, and signals of non-first frequency bands are filtered.
S404, controlling a second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mixing the second satellite signal, and outputting a second intermediate frequency signal belonging to a preset second frequency band, wherein the first frequency band and the second frequency band are not overlapped.
Similarly, for the second feed to receive the second satellite signal, after mixing it, the output second intermediate frequency signal should lie in the range 2010MHz to 2150 MHz.
In a specific implementation, a second local oscillation unit is first adopted to mix a second satellite signal to obtain a second intermediate frequency signal, then a second filter is continuously adopted to filter the second intermediate frequency signal, the filtered second intermediate frequency signal is output, and signals of a non-second frequency band are filtered.
In the embodiment of the application, since the second local oscillation units include a plurality of second local oscillation units, when the second local oscillation units are adopted to mix the second intermediate frequency signals, the target mixing frequency band corresponding to the second target local oscillation units can be determined first, the second target local oscillation units can be any one of the plurality of second local oscillation units, and then the second intermediate frequency signals are obtained when the second target local oscillation units are adopted to mix the second satellite signals belonging to the target mixing frequency band.
For example, if the second target local oscillator unit is determined to be LO2, it can be seen from table one that the corresponding target mixing frequency band is 10.830-10.970GHz, and at this time, the mixing processing can be selectively performed on the received second satellite signal belonging to the frequency band 10.830-10.970GHz, so as to output the intermediate frequency signal belonging to the range from 2010MHz to 2150 MHz.
The second target local oscillator unit may be determined according to a diseqc1.1 instruction sent by the set top box. In general, a diseqc1.1 based instruction may include 8 instructions S1-S8. As shown in table two, an example of the correspondence between a control instruction and the second local oscillation unit in this embodiment is shown.
And (II) table:
in the embodiment of the application, the positioning signals transmitted by the positioning satellites are received, whether the tuner is positioned in a preset live broadcast signal receiving range is determined according to the positioning signals, and only when the tuner is positioned in the live broadcast signal receiving range, the feeds are controlled to respectively receive signals transmitted by different live broadcast satellites, and intermediate frequency signals in the corresponding live broadcast signal receiving frequency range are obtained by mixing the signals. The embodiment identifies the position of the tuner by receiving the positioning signal transmitted by the positioning satellite, solves the problem that part of unauthorized areas randomly receive satellite live broadcast signals, ensures that television programs can only be broadcast in authorized areas in a landing mode, and reduces the supervision difficulty of a supervision mechanism on the areas where the television programs can be in the landing.
It should be noted that, the sequence number of each step in the above embodiment does not mean the sequence of execution sequence, and the execution sequence of each process should be determined by its function and internal logic, and should not limit the implementation process of the embodiment of the present application in any way.
For ease of understanding, the signal processing method of the present application will be described with reference to a specific example.
Fig. 5 is a schematic diagram of the overall architecture of a signal processing method according to the present embodiment. According to the architecture shown in fig. 5, the signal processing method of the present application may include the following processes:
1. the LNB (tuner) is powered on, at which time the default positioning unit GNSS (not shown) is powered on simultaneously, while the various feeds of the LNB are powered off. The GNSS receives the positioning signals transmitted by the positioning satellites through the antennas of the GNSS, obtains the current position information after processing, and transmits the current position information to the LNB for recognition.
2. The LNB compares the position information with electronic fence information preset in the LNB, and judges whether the current position is in the allowable receiving range of the television live broadcast signal. If the current position is in the allowable receiving range, controlling each feed source to work in a power-on mode, allowing each feed source to receive signals transmitted by a direct broadcast satellite, and enabling the GNSS units to synchronously perform power-off non-work processing; if the LNB is out of the allowable receiving range, the GNSS unit keeps the power-on state, and each feed source of the LNB keeps the power-off state.
3. When the current position is in the allowable receiving range, the two feed sources LNB_A and LNB_B of the LNB respectively receive signals transmitted by different satellites, and different local oscillator units are adopted for mixing, so that intermediate frequency signals in the receiving frequency range of the STB (set top box) are output. Specifically, the LNB_A controls to switch to receive different frequency bands through different DiSEqC1.1 instructions sent by the STB; and LNB_B sends 13V and 18V voltage and 0K and 22KHz pulse signals through STB to control switching and receiving of different frequency bands. The voltage of 13V or 18V (2 is selected 1), the pulse signal of 0KHz or 22KHz (2 is selected 1), and the different DiSEqC1.1 instruction signals (multi-selected 1) are respectively switched without mutual influence.
Referring to fig. 6, a schematic diagram of a signal processing apparatus according to an embodiment of the present application, which may be applied to a low noise down converter, may specifically include the following modules:
a positioning signal receiving module 601, configured to control a positioning unit of the low noise down converter to receive a positioning signal transmitted by a positioning satellite;
the region identification module 602 is configured to identify whether the low noise down converter is located in a preset region according to the positioning signal;
the first mixing module 603 is configured to control a first feed source of the low-noise down-converter to receive a first satellite signal transmitted by a first direct broadcast satellite, mix the first satellite signal, and output a first intermediate frequency signal belonging to a preset first frequency band if the low-noise down-converter is located in a preset area;
and the second mixing module 604 is configured to control the second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mix the second satellite signal, and output a second intermediate frequency signal belonging to a preset second frequency band, where the first frequency band and the second frequency band are not overlapped with each other.
In the embodiment of the present application, the area identifying module 602 may specifically include the following sub-modules:
the positioning signal decoding submodule is used for decoding the positioning signal to obtain position information corresponding to the positioning signal;
the position information identification sub-module is used for judging that the low-noise down converter is positioned in a preset area if the preset electronic fence information contains the position information; otherwise, the low-noise down converter is judged not to be in the preset area.
In the embodiment of the present application, the first mixing module 603 may specifically include the following sub-modules:
the first frequency mixing sub-module is used for mixing the first satellite signal by adopting a first local oscillator unit of the low-noise down converter to obtain a first intermediate frequency signal;
and the first filtering sub-module is used for filtering the first intermediate frequency signal by adopting a first filter of the low-noise down converter and outputting the filtered first intermediate frequency signal, and the first filter is a filter matched with the first frequency band.
In the embodiment of the present application, the second mixing module 604 may specifically include the following sub-modules:
the second mixing sub-module is used for mixing the second satellite signal by adopting a second local oscillator unit of the low-noise down converter to obtain a second intermediate frequency signal;
and the second filtering sub-module is used for filtering the second intermediate frequency signal by adopting a second filter of the low-noise down converter and outputting the filtered second intermediate frequency signal, and the second filter is a filter matched with the second frequency band.
In the embodiment of the present application, the second local oscillation unit may include a plurality of second local oscillation units, and the second mixing submodule may specifically include the following units:
the frequency mixing frequency band determining unit is used for determining a target frequency mixing frequency band corresponding to a second target local oscillator unit, wherein the second target local oscillator unit is any one of a plurality of second local oscillator units;
and the satellite signal mixing unit is used for mixing the second satellite signals belonging to the target mixing frequency band by adopting the second target local oscillation unit to obtain the second intermediate frequency signal.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference should be made to the description of the method embodiments.
Referring to fig. 7, a schematic diagram of a low noise down converter is shown, in accordance with one embodiment of the present application. As shown in fig. 7, the low noise down converter 700 of the present embodiment includes: a processor 710, a memory 720 and a computer program 721 stored in the memory 720 and executable on the processor 710. The processor 710, when executing the computer program 721, implements the steps of the various embodiments of the signal processing method described above, such as steps S401 to S404 shown in fig. 4. Alternatively, the processor 710 may perform the functions of the modules/units of the apparatus embodiments described above, such as the functions of the modules 601-604 of fig. 6, when executing the computer program 721.
Illustratively, the computer program 721 may be partitioned into one or more modules/units that are stored in the memory 720 and executed by the processor 710 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing particular functions that may be used to describe the execution of the computer program 721 in the low noise down converter 700. For example, the computer program 721 may be divided into a positioning signal receiving module, a region identifying module, a first mixing module and a second mixing module, each of which specifically functions as follows:
the positioning signal receiving module is used for controlling the positioning unit of the low-noise down converter to receive positioning signals transmitted by positioning satellites;
the region identification module is used for identifying whether the low-noise down converter is positioned in a preset region or not according to the positioning signal;
the first frequency mixing module is used for controlling a first feed source of the low-noise down converter to receive a first satellite signal transmitted by a first direct broadcast satellite and mixing the first satellite signal if the low-noise down converter is located in a preset area, and outputting a first intermediate frequency signal belonging to a preset first frequency band;
the second frequency mixing module is used for controlling the second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mixing the second satellite signal and outputting a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other.
The low noise down converter 700 may include, but is not limited to, a processor 710, a memory 720. It will be appreciated by those skilled in the art that fig. 7 is merely an example of a low noise down converter 700 and is not meant to be limiting as to the low noise down converter 700, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the low noise down converter 700 may further include input and output devices, network access devices, buses, etc.
The processor 710 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 720 may be an internal storage unit of the low noise down converter 700, such as a hard disk or a memory of the low noise down converter 700. The memory 720 may also be an external storage device of the low noise down converter 700, such as a plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card) or the like, which are provided on the low noise down converter 700. Further, the memory 720 may also include both internal storage units and external storage devices of the low noise down converter 700. The memory 720 is used to store the computer program 721 and other programs and data required by the low noise down converter 700. The memory 720 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the application also discloses a computer program product which, when being run on the low-noise down converter described in the previous embodiment, causes the low-noise down converter to execute the signal processing method described in the previous method embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto. Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (9)

1. A low noise down converter, comprising:
the positioning unit is used for receiving positioning signals transmitted by positioning satellites and identifying whether the low-noise down converter is positioned in a preset area or not according to the positioning signals;
the first feed source is electrically connected with the positioning unit and is used for receiving a first satellite signal transmitted by a first direct broadcast satellite when the low-noise down converter is positioned in a preset area;
the first local oscillator unit is electrically connected with the first feed source and is used for mixing the first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band;
the second feed source is electrically connected with the positioning unit and is independently configured with the first feed source and is used for receiving a second satellite signal transmitted by a second direct broadcast satellite; the method comprises the steps of,
the second local oscillation unit is electrically connected with the second feed source and is used for mixing the second satellite signals to obtain second intermediate frequency signals belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped; wherein the first frequency band is 950MHz to 1950MHz, and the second frequency band is 2010MHz to 2150MHz;
the power supply control unit is used for controlling the positioning unit to work in a power-on mode and controlling the first feed source and the second feed source to keep a power-off state when the low-noise down converter is powered on; and the first feed source and the second feed source are controlled to be electrified to work when the low-noise down converter is judged to be located in a preset area.
2. The low noise down converter of claim 1, further comprising:
the first filter is electrically connected with the first local oscillation unit and is used for filtering a first intermediate frequency signal and outputting the filtered first intermediate frequency signal, and the first filter is a filter matched with the first frequency band;
and the second filter is electrically connected with the second local oscillation unit and is used for filtering the second intermediate frequency signal and outputting the filtered second intermediate frequency signal, and the second filter is a filter matched with the second frequency band.
3. The low noise down converter of claim 2, wherein the second local oscillator units include a plurality of second local oscillator units, and the plurality of second local oscillator units are configured to correspond to one mixing frequency band respectively, and are configured to mix the second satellite signals belonging to the corresponding mixing frequency band, so as to obtain the second intermediate frequency signals belonging to the preset second frequency band.
4. A signal processing method for use in a low noise down converter, the signal processing method comprising:
the positioning unit of the low-noise down converter is controlled to receive positioning signals transmitted by positioning satellites;
identifying whether the low-noise down converter is located in a preset area according to the positioning signal;
if the low-noise down converter is located in a preset area, a first feed source of the low-noise down converter is controlled to receive a first satellite signal transmitted by a first direct broadcast satellite, the first satellite signal is mixed, and a first intermediate frequency signal belonging to a preset first frequency band is output;
controlling a second feed source of the low-noise down converter to receive a second satellite signal transmitted by a second direct broadcast satellite, mixing the second satellite signal, and outputting a second intermediate frequency signal belonging to a preset second frequency band, wherein the first frequency band and the second frequency band are not overlapped; wherein the first frequency band is 950MHz to 1950MHz, and the second frequency band is 2010MHz to 2150MHz;
the method further comprises the steps of:
when the low-noise down converter is electrified, the positioning unit is controlled to work in an electrified mode, and the first feed source and the second feed source are controlled to keep an outage state; and controlling the first feed source and the second feed source to be electrified to work when the low-noise down converter is judged to be located in a preset area.
5. The signal processing method according to claim 4, wherein the identifying whether the low noise down converter is located in a preset area according to the positioning signal comprises:
decoding the positioning signal to obtain position information corresponding to the positioning signal;
if the preset electronic fence information contains the position information, judging that the low-noise down converter is positioned in a preset area; otherwise, the low-noise down converter is judged not to be in the preset area.
6. The signal processing method according to claim 4, wherein said mixing the first satellite signal to output a first intermediate frequency signal belonging to a preset first frequency band, comprises:
mixing the first satellite signal by adopting a first local oscillator unit of the low-noise down converter to obtain a first intermediate frequency signal;
and filtering the first intermediate frequency signal by adopting a first filter of the low-noise down converter, and outputting the filtered first intermediate frequency signal, wherein the first filter is a filter matched with the first frequency band.
7. The signal processing method according to any one of claims 4 to 6, wherein said mixing the second satellite signal to output a second intermediate frequency signal belonging to a preset second frequency band includes:
mixing the second satellite signal by adopting a second local oscillator unit of the low-noise down converter to obtain a second intermediate frequency signal;
and filtering the second intermediate frequency signal by adopting a second filter of the low-noise down converter, and outputting the filtered second intermediate frequency signal, wherein the second filter is a filter matched with the second frequency band.
8. The signal processing method of claim 7, wherein the second local oscillator unit includes a plurality of second local oscillator units, and the second local oscillator unit using the low noise down converter mixes the second satellite signal to obtain a second intermediate frequency signal, comprising:
determining a target frequency mixing band corresponding to a second target local oscillator unit, wherein the second target local oscillator unit is any one of a plurality of second local oscillator units;
and mixing a second satellite signal belonging to the target mixing frequency band by adopting the second target local oscillator unit to obtain the second intermediate frequency signal.
9. A low noise down converter comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the low noise down converter is a low noise down converter according to any one of claims 1 to 4, the processor implementing a signal processing method according to any one of claims 4 to 8 when executing the computer program.
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Publication number Priority date Publication date Assignee Title
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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201365249Y (en) * 2009-02-18 2009-12-16 深圳翔成电子科技有限公司 KU band binary multi-output satellite low noise block
CN202077025U (en) * 2011-05-23 2011-12-14 深圳翔成电子科技有限公司 KU band tuner using single cable for transmission
CN203206224U (en) * 2013-04-25 2013-09-18 成都国恒空间技术工程有限公司 Portable satellite receiver fast satellite aligning circuit
CN104412527A (en) * 2012-07-02 2015-03-11 全球因瓦科马公司 Digital data processing apparatus and method
CN204305192U (en) * 2014-11-26 2015-04-29 珠海迈科智能科技股份有限公司 A kind of tuner and satellite signal receiving system
CN105611333A (en) * 2015-12-28 2016-05-25 北京中传数广技术有限公司 Satellite live broadcast system and method in support of longitude and latitude authorization
CN105657509A (en) * 2016-01-26 2016-06-08 泰斗微电子科技有限公司 LNB (Low Noise Amplifier) module for receiving satellite television signal and corresponding satellite television set top box
CN105657300A (en) * 2016-03-18 2016-06-08 珠海迈科智能科技股份有限公司 Satellite tuner circuit and satellite tuner
CN106060678A (en) * 2016-02-18 2016-10-26 泰斗微电子科技有限公司 Direct-broadcast satellite television broadcast receiving system LNB (Low Noise Block) module and satellite television set top box
CN106412467A (en) * 2016-08-26 2017-02-15 李燕如 Low-pass filter, LNB module and signal processing method
CN107623867A (en) * 2016-07-13 2018-01-23 络达科技股份有限公司 Have the top box of digital machine of positioning function and apply its satellite television receiving system
CN109991626A (en) * 2019-04-30 2019-07-09 电子科技大学中山学院 Beidou tuner and Beidou satellite receiver positioning and butt-joint device
CN212115548U (en) * 2019-12-27 2020-12-08 深圳市北斗万方信息技术有限公司 Low-noise down converter and signal processing system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009267619A (en) * 2008-04-23 2009-11-12 Sharp Corp Multi-feed horn, low noise block downconverter provided with the same, and antenna apparatus
US9470795B2 (en) * 2013-09-17 2016-10-18 Accord Software & Systems Pvt Ltd. Time to first fix optimization in a satellite navigation receiver

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201365249Y (en) * 2009-02-18 2009-12-16 深圳翔成电子科技有限公司 KU band binary multi-output satellite low noise block
CN202077025U (en) * 2011-05-23 2011-12-14 深圳翔成电子科技有限公司 KU band tuner using single cable for transmission
CN104412527A (en) * 2012-07-02 2015-03-11 全球因瓦科马公司 Digital data processing apparatus and method
CN203206224U (en) * 2013-04-25 2013-09-18 成都国恒空间技术工程有限公司 Portable satellite receiver fast satellite aligning circuit
CN204305192U (en) * 2014-11-26 2015-04-29 珠海迈科智能科技股份有限公司 A kind of tuner and satellite signal receiving system
CN105611333A (en) * 2015-12-28 2016-05-25 北京中传数广技术有限公司 Satellite live broadcast system and method in support of longitude and latitude authorization
CN105657509A (en) * 2016-01-26 2016-06-08 泰斗微电子科技有限公司 LNB (Low Noise Amplifier) module for receiving satellite television signal and corresponding satellite television set top box
CN106060678A (en) * 2016-02-18 2016-10-26 泰斗微电子科技有限公司 Direct-broadcast satellite television broadcast receiving system LNB (Low Noise Block) module and satellite television set top box
CN105657300A (en) * 2016-03-18 2016-06-08 珠海迈科智能科技股份有限公司 Satellite tuner circuit and satellite tuner
CN107623867A (en) * 2016-07-13 2018-01-23 络达科技股份有限公司 Have the top box of digital machine of positioning function and apply its satellite television receiving system
CN106412467A (en) * 2016-08-26 2017-02-15 李燕如 Low-pass filter, LNB module and signal processing method
CN109991626A (en) * 2019-04-30 2019-07-09 电子科技大学中山学院 Beidou tuner and Beidou satellite receiver positioning and butt-joint device
CN212115548U (en) * 2019-12-27 2020-12-08 深圳市北斗万方信息技术有限公司 Low-noise down converter and signal processing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
卫星接收天线三大参数准确定位方法――直角三角形法;杨秀坤;杨秀玲;;有线电视技术(第02期);全文 *

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