WO2017101264A1 - Procédé et système de recherche de canal pour terminal de télévision - Google Patents

Procédé et système de recherche de canal pour terminal de télévision Download PDF

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Publication number
WO2017101264A1
WO2017101264A1 PCT/CN2016/084490 CN2016084490W WO2017101264A1 WO 2017101264 A1 WO2017101264 A1 WO 2017101264A1 CN 2016084490 W CN2016084490 W CN 2016084490W WO 2017101264 A1 WO2017101264 A1 WO 2017101264A1
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WO
WIPO (PCT)
Prior art keywords
frequency
television terminal
band
sub
image carrier
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PCT/CN2016/084490
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English (en)
Chinese (zh)
Inventor
范存源
吴有肇
Original Assignee
深圳Tcl数字技术有限公司
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Publication of WO2017101264A1 publication Critical patent/WO2017101264A1/fr

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Classifications

    • 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 MPEG packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • 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 MPEG packets from an IP network
    • 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

Definitions

  • the present invention relates to the field of television search technology, and in particular, to a television terminal search method and system.
  • TV terminals such as LCD TVs
  • television terminals have gradually appeared as essential household appliances in every home. People generally need to control the TV terminal to search and save the channel in order to watch the TV program through the TV terminal.
  • the current search principle of the TV terminal on the market is based on time domain analysis, and the frequency point on the full frequency band of the received RF signal. Performing analysis and demodulation one by one, wasting a lot of time to analyze and demodulate frequency points that are not image carrier frequencies (ie, non-image carrier frequency points), causing the TV terminal to take a full frequency band frequency search station takes a long time, Leading to the inefficiency of TV terminal search.
  • the main object of the present invention is to provide a television terminal search method and system, which aims to solve the technical problem of low efficiency of searching for existing television terminals.
  • the present invention provides a television terminal search method, and the television terminal search method includes:
  • the frequency point at which the signal strength of each of the image carrier frequency preset trimming bandwidth ranges is maximized is set as the channel carrier frequency point.
  • the step of performing spectrum analysis on the radio frequency signals in the sub-band interval one by one, and obtaining the image carrier frequency points in the spectrogram of each of the sub-band intervals includes:
  • the potential frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum
  • the potential frequency point is set as an image carrier frequency point to obtain an image carrier frequency point in the spectrogram of each of the sub-band sections.
  • the step of dividing the frequency band interval into sub-band intervals in which the signal bandwidth is a preset bandwidth and continuously distributed includes:
  • the RF signal of the preset bandwidth is outputted one by one to divide the frequency band section into subband sections of a preset bandwidth and continuously distributed.
  • the invention also provides a television terminal searching method, and the television terminal searching method comprises:
  • the search frequency is searched according to each of the image carrier frequency points, and the carrier frequency point confirmed by the search station is set as the channel carrier frequency point.
  • the step of searching for the carrier frequency point according to each of the image carrier frequency points, and setting the carrier frequency point confirmed by the search station to the channel carrier frequency point comprises:
  • the frequency point at which the signal strength of each of the image carrier frequency preset trimming bandwidth ranges is maximized is set as the channel carrier frequency point.
  • the step of acquiring a frequency band interval of the radio frequency signal received by the television terminal when detecting the search instruction includes:
  • the corresponding frequency band interval is obtained, and the frequency band interval is used as the frequency band interval of the radio frequency signal currently received by the television terminal.
  • the step of performing spectrum analysis on the radio frequency signals in the sub-band interval one by one, and obtaining the image carrier frequency points in the spectrogram of each of the sub-band intervals includes:
  • the potential frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum
  • the potential frequency point is set as an image carrier frequency point to obtain an image carrier frequency point in the spectrogram of each of the sub-band sections.
  • the step of dividing the frequency band interval into sub-band intervals in which the signal bandwidth is a preset bandwidth and continuously distributed includes:
  • the RF signal of the preset bandwidth is outputted one by one to divide the frequency band section into subband sections of a preset bandwidth and continuously distributed.
  • the present invention further provides a television terminal search system, the television terminal search system comprising:
  • the interval obtaining module is configured to acquire a frequency band interval of the radio frequency signal received by the television terminal when detecting the search instruction;
  • the interval division module divides the frequency band interval into subband sections that are preset bandwidths and are continuously distributed;
  • a spectrum analysis module performing spectrum analysis on the radio frequency signals in the sub-band interval one by one, and acquiring image carrier frequency points in the spectrogram of each of the sub-band intervals;
  • the channel setting module is configured to perform searching according to each of the image carrier frequency points, and set a frequency point confirmed by the search station as a channel carrier frequency point.
  • the channel setting module comprises:
  • a fine adjustment unit configured to demodulate all frequency points in a preset fine adjustment bandwidth range of each of the image carrier frequency points by using a preset fine adjustment step size
  • a setting unit configured to set a frequency point of the signal intensity of each of the image carrier frequency preset trimming bandwidth ranges to be a channel carrier frequency point.
  • the interval obtaining module includes:
  • a first acquiring unit configured to acquire country information corresponding to a current location where the television terminal is located when detecting a search instruction
  • the second acquiring unit is configured to obtain a corresponding frequency band interval according to the acquired national information, and use the frequency band interval as a frequency band interval of the radio frequency signal currently received by the television terminal.
  • the spectrum analysis module comprises:
  • a first analyzing unit configured to perform spectrum analysis on the radio frequency signals in the sub-band interval one by one, when a frequency point in the sub-band interval has a signal spectrum, and the frequency point is used as a potential frequency point;
  • a second analyzing unit configured to: if a frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum, set the potential frequency point to an image carrier frequency point to obtain a frequency spectrum of each of the sub-band intervals The image carrier frequency in the image.
  • the interval division module comprises:
  • a filtering unit configured to filter a radio frequency signal received by the television terminal by using a band pass filter
  • a partitioning unit configured to output a preset bandwidth radio frequency signal one by one to divide the frequency band section into a preset bandwidth and a continuously distributed sub-band section.
  • the invention obtains the frequency band interval of the radio frequency signal received by the television terminal when detecting the search instruction, and then divides the frequency band interval into the preset bandwidth and the continuously distributed sub-band interval; and performs spectrum on the radio frequency signals of the sub-band interval one by one. Analysis, obtaining image carrier frequency points in the spectrogram of each sub-band interval; finally searching for each image carrier frequency point, The frequency point confirmed by the search station is set as the channel carrier frequency point, thereby performing spectrum analysis on the sub-band interval of the preset bandwidth, and quickly acquiring the image carrier frequency point therein and setting the image carrier frequency point to the channel carrier frequency. Points, to avoid analysis and demodulation of each frequency point in the frequency band interval, saving the time for the television terminal to search, and improving the efficiency of the television terminal search.
  • FIG. 1 is a schematic flow chart of a first embodiment of a television terminal searching method according to the present invention
  • FIG. 2 is a second embodiment of a television terminal searching method according to the present invention, which performs searching according to each image carrier frequency point, A detailed flow diagram of the step of setting the frequency point confirmed by the search station to the channel carrier frequency point;
  • FIG. 3 is a schematic flowchart of the steps of obtaining a frequency band interval of a radio frequency signal received by a television terminal when detecting a search command in the third embodiment of the television terminal searching method according to the present invention
  • FIG. 4 is a schematic flowchart of a step of performing spectrum analysis on radio frequency signals of sub-band sections one by one in the fourth embodiment of the television terminal searching method of the present invention, and acquiring image carrier frequency points in the spectrogram of each sub-band interval;
  • FIG. 5 is a schematic flowchart of a step of dividing a frequency band section into a preset bandwidth and continuously distributing sub-band sections in the fifth embodiment of the television terminal searching method according to the present invention
  • FIG. 6 is a schematic diagram of functional modules of a first embodiment of a television terminal search system according to the present invention.
  • FIG. 7 is a schematic diagram of a refinement function module of a channel setting module in a second embodiment of the television terminal search system of the present invention.
  • FIG. 8 is a schematic diagram of a refinement function module of a section acquisition module in a third embodiment of the television terminal search system of the present invention.
  • FIG. 9 is a schematic diagram of a refinement function module of a spectrum analysis module in a fourth embodiment of the television terminal search system of the present invention.
  • FIG. 10 is a schematic diagram of a refinement function module of the section division module in the fifth embodiment of the television terminal search system of the present invention.
  • the present invention provides a television terminal search method.
  • the television terminal search method includes:
  • Step S10 when detecting a search command, acquiring a frequency band interval of the radio frequency signal received by the television terminal;
  • the television terminal When the user performs a search operation on the television terminal, for example, the user presses the search button of the remote controller, the television terminal generates a search command.
  • the television terminal search system detects whether the television terminal generates a search command in real time. When detecting the search command, it indicates that the user needs the television terminal to search for the station. At this time, the frequency band of the radio frequency signal received by the television terminal is obtained, that is, the radio frequency signal input end.
  • the frequency band of the radio frequency signal input to the television terminal for example, the frequency band of the full domestic frequency band in China is 43 MHz to 866 MHz.
  • Step S20 dividing the frequency band interval into a preset bandwidth and continuously distributing the sub-band intervals
  • the frequency band interval of the radio frequency signal input to the television terminal is segmented for the purpose of facilitating spectrum analysis of the radio frequency signal, because the bandwidth of one channel of the PAL-D/K system is specified to be 8 MHz, and the preset bandwidth can be set here. It is 40MHz, which is equivalent to having 5 channel bandwidths that can be analyzed in the spectrum analysis module at the same time.
  • the sub-band sections with the band-band interval is the preset bandwidth and continuously distributed are completed by the band-pass filter.
  • the frequency band interval is divided into four sub-band intervals of continuous distribution, which are: 49.75 MHz to 89.75 MHz, 89.75 MHz to 129.75 MHz, 129.75 MHz to 169.75 MHz, 169.75 MHz to 209.75 MHz.
  • the preset bandwidth can be an integer multiple of the channel bandwidth. It can be understood that the division of the frequency band interval can be correspondingly changed according to the difference of the television system.
  • Step S30 performing spectrum analysis on the radio frequency signals in the sub-band interval one by one, and acquiring image carrier frequency points in the spectrogram of each sub-band interval;
  • the Fourier transform of the RF signals (ie, complex time history waveforms) of each sub-channel interval is decomposed into several single harmonic components to obtain signals.
  • the frequency structure and each harmonic and phase information and according to the information, obtain image carrier frequency points in the spectrogram of each sub-band interval. For example, first, the frequency point having the spectrum signal on the spectrogram is used as the potential frequency point, and then if the frequency point of the preset frequency interval (the frequency interval of the sound carrier frequency) is also provided with the spectrum signal, the potential frequency is also used. The point is used as the image carrier frequency point.
  • image carrier frequencies can be stored centrally in the list of frequency points.
  • step S40 the search is performed according to each image carrier frequency point, and the frequency point confirmed by the search station is set as the channel carrier frequency point.
  • the frequency band interval near the image carrier frequency point in each sub-band interval is searched, and the carrier frequency point confirmed by the search station is set as the channel carrier frequency point, that is, the user switches to the channel carrier frequency point by controlling the television terminal. You can watch the corresponding TV show.
  • the frequency band interval of the radio frequency signal received by the television terminal is obtained; then the frequency band interval is divided into the preset bandwidth and the continuously distributed sub-band interval; and the sub-band interval is performed one by one.
  • the radio frequency signal is subjected to spectrum analysis to obtain image carrier frequency points in the spectrogram of each sub-band interval; finally, the search is performed according to each image carrier frequency point.
  • the carrier frequency point confirmed by the search station is set as the channel carrier frequency point, thereby performing spectrum analysis on the sub-band interval of the preset bandwidth in turn, quickly obtaining the image carrier frequency point therein and setting the image carrier frequency point as the channel
  • the frequency point avoids the analysis and demodulation of each frequency point in the frequency band interval, which saves the time for the television terminal to search for the station and improves the efficiency of the television terminal searching for the station.
  • step S40 includes:
  • Step S41 demodulating all frequency points in the preset trimming bandwidth range for each image carrier frequency point by using a preset fine adjustment step size
  • Step S42 setting a frequency point with the highest signal intensity in the preset fine-tuning bandwidth range of each image carrier frequency point as a channel carrier frequency point.
  • each channel number of the TV channel table and the corresponding image carrier frequency are one-to-one correspondence and fixed (for example, the image carrier frequency of channel 1 of the PAL-D/K system is 49.75 MHz), and due to the television terminal Due to factors such as hardware differences and spectrum analysis errors, the image carrier frequency points obtained by spectrum analysis may have a certain deviation from the actual image carrier frequency points. It is not particularly accurate and requires fine search; that is, image carrier frequency points obtained by spectrum analysis. If it is directly used as the channel carrier frequency, the TV terminal may have unclear and the image may interfere with the snowflake point.
  • the detailed process of fine search is as follows: first select an image carrier frequency point, demodulate it in a preset fine adjustment step within the preset fine adjustment bandwidth of the image carrier frequency point, and select the frequency point with the highest signal strength as the channel carrier frequency. Point; then, one by one, select the most powerful signal points near the carrier frequency points of other images as the other carrier frequency points.
  • the first image carrier frequency selected is 50.25 MHz. If the preset trimming bandwidth is 1 MHz, the preset fine tuning step is 0.25. MHz, demodulated one by one by a non-coherent demodulation or coherent demodulation method from a frequency of 49.75MHz to 50.75MHz in a bandwidth of 0.25MHz (ie within a 1M bandwidth centered at 50.25), and finally determined according to the demodulated signal strength The frequency point with the highest signal strength is used as the channel carrier frequency point. In addition, in the example of this paragraph, the frequency is 50.25.
  • the coherent demodulation method demodulates one by one in a bandwidth of 49.25 MHz to 50.25 MHz (ie, within a 1 M bandwidth centered on 49.75) in a step size of 0.25 MHz, and finally determines a frequency point at which the signal strength is maximum according to the demodulated signal strength as a channel. Carrier frequency point.
  • the frequency point in the preset fine-tuning bandwidth of the image carrier frequency point is further demodulated, and the signal intensity in the preset fine-tuning bandwidth of each image carrier frequency point is selected.
  • the frequency point is used as the channel carrier frequency point, which further improves the accuracy of the channel carrier frequency point, and improves the video quality of the television program playing the television program according to the channel carrier frequency point.
  • step S10 includes:
  • Step S11 when detecting the search for the station instruction, acquiring country information corresponding to the current location where the television terminal is located;
  • Step S12 Obtain a corresponding frequency band interval according to the acquired national information, and use the frequency band interval as a frequency band interval of the radio frequency signal currently received by the television terminal.
  • the frequency band range of China is 43MHz to 866MHz
  • the frequency band range of Japan is 88MHz to 770MHz. Therefore, when detecting the search command, you can first Obtaining a current location of the television terminal, and obtaining country information (such as a country code) corresponding to the location of the television terminal according to the current location; obtaining a corresponding frequency band interval according to the obtained national information, and using the frequency band interval as a current TV terminal The band interval of the received RF signal.
  • country information such as a country code
  • the current location information of the current position of the television terminal is first acquired, and then the corresponding frequency band interval is obtained according to the national information, thereby avoiding the obtained frequency band interval and the frequency band of the country where the television terminal is located.
  • the interval is inconsistent, and thus avoiding the phenomenon of missing the channel caused by the inconsistent band interval.
  • step S30 includes:
  • Step S31 performing spectrum analysis on the radio frequency signals in the sub-band interval one by one, when the frequency points in the sub-band interval have a signal spectrum, and using the frequency point as a potential frequency point;
  • Step S32 If the frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum, the potential frequency point is set as an image carrier frequency point to obtain an image carrier frequency point in the spectrogram of each sub-band interval.
  • spectrum analysis is performed on the radio frequency signals of each sub-band interval one by one from the first sub-band interval of the frequency band interval, and which of the frequency points in the sub-band interval have signal spectrum
  • the frequency point is used as a potential frequency point; then it is further determined whether the frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum; if the potential frequency point is preset If the frequency point of the frequency band interval also has a signal spectrum, the potential frequency point is set as the image carrier frequency point, and thus the cycle analysis and judgment are performed to obtain the image carrier frequency point in the spectrum diagram of each sub-band interval.
  • the preset frequency band interval is 6.5MHz, if the frequency of the 49.75MHz frequency point in the sub-band interval has a signal. Spectrum, the 49.75MHz frequency point is taken as the potential frequency point, and then further judged that the frequency spectrum of the 56.25MHz frequency point from the frequency point of 6.5MHz also has a signal spectrum, then it can be determined that the 49.75MHz frequency point is the image carrier frequency point, and so on, determine all All image carrier frequency points in the sub-band interval.
  • the potential frequency points having the signal spectrum in the sub-band interval are first analyzed and selected, and then the frequencies outside the preset frequency band interval of the potential frequency points are determined. Whether the point also has a signal spectrum, and the potential frequency point that meets the judgment condition is set as the image carrier frequency point, thereby realizing the spectrum analysis of the radio frequency signal and quickly and accurately selecting the image carrier frequency point in a simple and feasible manner. .
  • step S20 includes:
  • Step S21 performing a filtering process on the radio frequency signal received by the television terminal through a band pass filter
  • step S22 the radio frequency signals of the preset bandwidth are outputted one by one to divide the frequency band interval into sub-band intervals of the preset bandwidth and continuously distributed.
  • the band pass filter is a device that allows waves in a specific frequency band to pass through while shielding other frequency bands.
  • the television terminal is internally provided with a band pass filter. After determining the frequency band interval of the radio frequency signal received by the television terminal, the band pass filter is controlled to the television terminal.
  • the received RF signal is filtered to output a preset bandwidth RF signal one by one to divide the frequency band interval into a preset bandwidth and a continuously distributed sub-band interval.
  • An implementation manner of the specific processing is as follows: setting the left boundary value of the band interval (for example, the band interval is 43 MHz to 866 MHz, the left boundary value of the band interval is 43 MHz) is set as the starting frequency of the band pass filter, so that the band pass is passed.
  • the RF signal of the filter is limited to a preset bandwidth (for example, 40MHz), that is, the RF signal of the first sub-band interval (43MHz to 83MHz) is output; then the left boundary value of the second sub-band interval (83MHz to 123MHz) is reset. (ie, 83MHz) is the new starting frequency of the bandpass filter, so that the RF signal passing through the bandpass filter is limited to a preset bandwidth (for example, 40MHz), that is, the RF signal of the second subband interval (83MHz to 123MHz) is output. This cycle, until the search completes the entire frequency band of the TV terminal, thereby dividing the frequency band interval into a preset bandwidth and a continuously distributed sub-band interval.
  • a preset bandwidth for example, 40MHz
  • the radio frequency signal received by the television terminal is filtered by using a band pass filter, the frequency band of the pass signal allowed by the band pass filter is continuously changed, and the radio frequency signal of the preset bandwidth is outputted one by one, and the television terminal has been used.
  • the received RF signal band interval is divided into preset bandwidth and continuously distributed sub-band intervals, thereby realizing the partitioning of the frequency band interval in a simple and easy-to-implement manner, thereby facilitating spectrum analysis of signals in each sub-band interval.
  • Step S20 includes:
  • Step S21 performing a filtering process on the radio frequency signal received by the television terminal through a band pass filter
  • step S22 the radio frequency signals of the preset bandwidth are outputted one by one to divide the frequency band interval into sub-band intervals of the preset bandwidth and continuously distributed.
  • the present invention also provides a television terminal search system.
  • the television terminal search system includes:
  • the interval obtaining module 10 is configured to acquire a frequency band interval of the radio frequency signal received by the television terminal when detecting the search instruction;
  • the interval dividing module 20 divides the frequency band interval into a preset bandwidth and continuously distributes the sub-band interval;
  • the spectrum analysis module 30 performs spectrum analysis on the radio frequency signals of the sub-band sections one by one to obtain image carrier frequency points in the spectrogram of each sub-band interval;
  • the channel setting module 40 is configured to perform searching according to each image carrier frequency point, and set a frequency point confirmed by the search station as a channel carrier frequency point.
  • the channel setting module 40 searches for the frequency band section near the image carrier frequency point in each sub-band interval, and sets the carrier frequency point that is loved by the search station to be set as the channel carrier frequency point, that is, the user switches to the television terminal by controlling the television terminal. These channel carrier frequencies can be used to view the corresponding TV programs.
  • the channel setting module 40 includes:
  • the fine adjustment unit 41 is configured to demodulate all the frequency points in the preset fine adjustment bandwidth range for each image carrier frequency point by using a preset fine adjustment step size;
  • the setting unit 42 is configured to set a frequency point at which the signal strength of each of the image carrier frequency preset trimming bandwidth ranges is the maximum as a channel carrier frequency point.
  • the interval obtaining module 10 includes:
  • the first obtaining unit 11 is configured to acquire country information corresponding to a current location where the television terminal is located when detecting a search instruction;
  • the second obtaining unit 12 is configured to obtain a corresponding frequency band interval according to the acquired national information, and use the frequency band interval as a frequency band interval of the radio frequency signal currently received by the television terminal.
  • the spectrum analysis module 30 includes:
  • the first analyzing unit 31 is configured to perform spectrum analysis on the radio frequency signals in the sub-band interval one by one, and the frequency points in the sub-band interval have a signal spectrum, and the frequency point is used as a potential frequency point;
  • the second analyzing unit 32 is configured to: if the frequency point of the preset frequency band interval of the potential frequency point also has a signal spectrum, set the potential frequency point to an image carrier frequency point to obtain an image in the spectrogram of each sub-band interval Carrier frequency point.
  • the interval division module 20 includes:
  • a filtering unit 21 configured to perform filtering processing on the radio frequency signal received by the television terminal by using a band pass filter
  • the partitioning unit 22 is configured to output the radio frequency signals of the preset bandwidth one by one to divide the frequency band interval into the preset bandwidth and the continuously distributed sub-band intervals.
  • the interval division module 20 includes:
  • a filtering unit 21 configured to perform filtering processing on the radio frequency signal received by the television terminal by using a band pass filter
  • the partitioning unit 22 is configured to output the radio frequency signals of the preset bandwidth one by one to divide the frequency band interval into the preset bandwidth and the continuously distributed sub-band intervals.
  • the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods of various embodiments of the present invention.

Abstract

L'invention concerne un procédé de recherche de canal pour un terminal de télévision. Le procédé comprend les étapes suivantes : lorsqu'une instruction de recherche de canal est détectée, acquérir l'intervalle de bande de fréquence des signaux radiofréquences reçus par un terminal de télévision ; diviser l'intervalle de bande de fréquence en sous-intervalles de bande de fréquence distribués en continu d'une bande passante prédéfinie ; effectuer des analyses spectrales sur les signaux radiofréquences des sous-intervalles de bande de fréquence un par un ; acquérir des fréquences porteuses d'images dans les spectrogrammes des sous-intervalles de bande de fréquences ; rechercher des canaux d'après les fréquences porteuses d'images et définir les fréquences déterminées lors de la recherche de canal en tant que fréquences porteuses de canaux. L'invention concerne également un système de recherche de canal pour le terminal de télévision. Les analyses spectrales sont effectuées de façon séquentielle sur les sous-intervalles de bande de fréquences de la bande passante prédéfinie, puis les fréquences porteuses d'images y sont acquises rapidement puis définies comme des fréquences porteuses de canaux, ce qui permet d'éviter une analyse et une démodulation pour chaque fréquence de l'intervalle de bande de fréquence, de réduire le temps de recherche de canal pour le terminal de télévision et d'augmenter l'efficacité du terminal de télévision lors de la recherche du canal.
PCT/CN2016/084490 2015-12-17 2016-06-02 Procédé et système de recherche de canal pour terminal de télévision WO2017101264A1 (fr)

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CN201510952919.5 2015-12-17
CN201510952919.5A CN105516798B (zh) 2015-12-17 2015-12-17 电视终端搜台方法及系统

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