CN1615004A - Automatic channel searching method in digital Tv-set - Google Patents
Automatic channel searching method in digital Tv-set Download PDFInfo
- Publication number
- CN1615004A CN1615004A CN 200410054279 CN200410054279A CN1615004A CN 1615004 A CN1615004 A CN 1615004A CN 200410054279 CN200410054279 CN 200410054279 CN 200410054279 A CN200410054279 A CN 200410054279A CN 1615004 A CN1615004 A CN 1615004A
- Authority
- CN
- China
- Prior art keywords
- channel
- search
- carrier frequency
- auto
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The method including following steps: the received signal is made spectral analysis and spectral identification to get rough carrier frequency and symbol rate; the channel demodulation and decoding is used to check and modify the identified parameter for getting more precised result; a dedicated automatically searching controller is used to control the working procedure between spectral analysis, spectral identification, channel demodulation and signal decoding, and interact with bus controller; a dedicated bus controller is used to receive the command from user, and monitor the working state and procedure of each module in receiver, and then output and save the searching result.
Description
Technical field
The invention belongs to digital signal transmission field, particularly the method for the fast automatic channel searching in the Digital Television.
Background technology
The structural representation of traditional digital television receiver comprises modules such as signal input 101, downconverter 102, channel demodulator 103, channel decoder 104, source decoder 105, display 106, control input module 107, master controller 108, memory 110 and control bus 109 as shown in Figure 1.Downconverter 102 the radiofrequency signals that receive from stimulus part 101 transform to channel demodulator 103 can the suitable frequency of demodulation on, be converted to data flow through channel demodulator 103 and channel decoder 104 then, 105 pairs of these data flow streams of source decoder are decoded, and show by display 106.Control input module 107 receives operational order from the user, and master controller 108 is adjusted the running parameter of each module of receiver according to user command.This digital television receiver will be caught program needs the user to dispose " carrier frequency " and " symbol rate " two basic transmission parameters at least, in the digital television transfer standard of existing and foreseeable future, because the needs of flexibility, these two parameters all have a large amount of possibility values.That is to say that the user of digital television receiver must have a data form (being commonly referred to " program guide ") that comprises these parameters accurately, could correct received television program.Yet the ordinary family user will obtain this " program guide " and be not easy, and they are the outer expense of commitment for this reason possibly.Same, digital television service provider will provide the problem that this " program guide " also faces increases overhead for the user.
In order to address the above problem, improved digital television receiver has increased the channel search function in the software of master controller 108.Disclosed scheme mainly contains two kinds: a kind of scheme is all possible program parameter to be dispatched from the factory just be stored in the memory 109 of receiver before, we are called " program dictionary ", one by one receiver are provided with trial by these parameters of master controller 108 usefulness and whether have channel.Obtain one group of " program guide " that really has channel at last, obviously " program guide " that obtains like this can only be a subclass of " program dictionary ", channel newly-increased or that revised parameter can't be searched, promptly upgrading in time of " program guide " can't be guaranteed.Simultaneously, this scheme needs a large amount of memory spaces, has increased the receiver cost.
Second kind of scheme is to suppose that the symbol rate of different channel is identical and known, then sets certain carrier frequency by 108 pairs of downconverters of master controller 102, simultaneously channel demodulator 103 set these known symbol rates, attempts whether having channel.If channel is arranged, then extract behind the programme informations and deposit this carrier frequency and symbol rate and program parameter in memory 109, and then with certain stepping amount next carrier frequency is set and attempts by source decoder 105; If there is not channel, then also next carrier frequency is set and attempts, so circulation with certain stepping amount.This searching method generally can not be worked under the unknown or skimble-scamble situation in symbol rate, even for the known situation of symbol rate, it is also very long to carry out the time that a channel search needs, and the limit that can tolerate of user can't reach realistic scale head and shoulders above.
Summary of the invention
The present invention discloses the method for auto channel search in a kind of Digital Television, adopts this method, does not have in other words under any known channel parameter situation under the carrier frequency of channel and the equal condition of unknown of symbol rate, can realize fast automatic channel search.
This method may further comprise the steps: by carrying out the identification of spectrum analysis and frequency spectrum, carrier frequency that obtains being similar to and symbol rate to received signal; Check and revise the parameter that identifies by channel demodulation and decoding, obtain more accurate result; Control workflow between spectrum analysis, frequency spectrum identification, channel demodulation and the signal decoding by a special auto-search controller, and carry out alternately with master controller; Receive user instruction by a special master controller, the operating state of each module of check receiver and workflow, and output and preservation Search Results.
Described method of carrying out spectrum analysis to received signal is: carry out fast Fourier transform (FFT) to the received signal, obtain the discrete spectrum curve of signal.
Described method of carrying out spectrum analysis to received signal is: carry out frequency sweep (Sweep) to the received signal, obtain the discrete spectrum curve of signal.
Described method of carrying out frequency spectrum identification to received signal is: this spectrum curve and echo signal template are carried out the linear correlation matching operation, the carrier frequency that obtains being similar to by the center of calculating frequency spectrum, by calculate frequency spectrum-symbol rate that three dB bandwidth obtains being similar to.
Describedly check and the method for revising the parameter that identifies may further comprise the steps by channel demodulation and decoding: downconverter transforms to the radiofrequency signal of input on the needed appropriate frequency of channel demodulation module; Under the auto-search controller control, the approximate carrier frequency and the symbol rate that obtain with frequency spectrum identification start channel demodulation as the initialization parameter, and signal is carried out carrier wave recover and regularly recover, and the channel compensation that may need; Dateout to channel demodulator is analyzed, and judges whether channel demodulator has really locked onto on the correct received signal, and judged result is exported to auto-search controller; Auto-search controller control starts channel decoder down, and the channel demodulation dateout is carried out and the corresponding channel-decoding of transmitting terminal chnnel coding, comprises various forward error corrections (FEC), deinterleaving, descrambling and other possible computings, output stream; Dateout to channel decoder is analyzed, and judges the data flow that whether channel-decoding has really recovered needs reception, and judged result is exported to auto-search controller; If channel demodulation and channel-decoding can both be locked on the correct received signal, show then to have searched a channel that at this moment the running parameter of channel demodulation and channel-decoding is exactly the channel parameter accurately through check and correction; If channel demodulation and channel-decoding can not be locked on the correct received signal, show that then approximate carrier frequency and the symbol rate that frequency spectrum identification obtains is wrong.
The control flow of described auto-search controller is: auto-search controller is from the wait state that resets, in case receive the startup search instruction from master controller, then begins to search for automatically; At first start spectrum analysis, can not have channel, then finish search and the discovery channel indication is put 0, otherwise start frequency spectrum identification if spectrum analysis is judged; Start after the frequency spectrum identification, go out carrier frequency and symbol rate, then this carrier frequency and symbol rate are started channel demodulator as configuration parameter according to the spectrum curve shape recognition; If judge that channel demodulation work is incorrect, then search finishes and the discovery channel indication is put 0, otherwise starts channel decoder; Start after the channel decoder,, otherwise finish search and the discovery channel indication is put 0 if judge channel-decoding work correctly then finish search and the discovery channel indication puts 1.
The control flow of described master controller is: when the user imports the automatic channel search order, from the starting point of reference carrier frequency to be searched, downconverter is provided with carrier frequency to be searched, starts auto-search controller then; After this, search condition in the master controller monitoring auto-search controller, if search finishes and discovery channel is designated as 1, then starting source decoder decodes to data stream, analysis obtains TV programme and other possible service content, calculate and store carrier frequency corresponding and symbol rate simultaneously, and calculate down some carrier frequency to be searched with certain stepping amount; If search finishes and discovery channel is designated as 0, then calculate down some carrier frequency to be searched with certain stepping amount; When surpassing reference carrier frequency, carrier frequency to be searched finishes channel search, otherwise downconverter is provided with this carrier frequency to be searched and starts auto-search controller once more carry out next round search, so circulation is till carrier frequency to be searched surpasses reference carrier frequency; The quantity and the parameter of channel indicated and searched to the progress bar of demonstration search procedure in this process, comprises carrier frequency and symbol rate.
Fast automatic channel searching method of the present invention is applicable to various digital television transmission systems, owing to adopted elder generation to carry out carrier frequency that the identification of spectrum analysis and frequency spectrum obtains being similar to and symbol rate checked and revised the parameter that identifies then by channel demodulation and decoding method to received signal, improved search accuracy and speed greatly, guaranteed that Search Results can satisfy the user to simple and efficient requirement under the prerequisite accurately.
Description of drawings
Fig. 1 is the structural representation of conventional digital TV receiver;
Fig. 2 is the structural representation of the digital television receiver of a specific embodiment of the present invention;
Fig. 3 is the control flow chart of the master controller of a specific embodiment of the present invention;
Fig. 4 is the control flow chart of the auto-search controller of a specific embodiment of the present invention.
Embodiment
Describe operation principle of the present invention in detail with reference to a specific embodiment of the present invention below.
Figure 2 shows that the structural representation of the digital television receiver of this embodiment, it comprises:
Signal input 201: input comprises and remains the radiofrequency signal of received signal.From frequency domain, this radiofrequency signal generally comprises a plurality of channels that are distributed on the different center frequency, and the centre frequency of these channels does not often have clear and definite rule.
Downconverter 202: radiofrequency signal is transformed on the channel demodulator 203 needed appropriate frequency.What export can be that accurate baseband signal also can be an intermediate-freuqncy signal, even can produce digital intermediate frequency with digital down conversion DDC (Digital Down Conversion).
Channel demodulator 203: signal is carried out carrier wave recover and regularly recover, and other channel compensations that may need.Searching period, by auto-search controller 211 possible carrier frequency and the symbol rate that frequency spectrum identifier 208 obtains disposed to channel demodulator 203 as initial parameter, channel demodulator 203 was started working from this initial state after a period of time, if the channel that certain existence can receive, channel demodulator 203 will be locked on one group of accurate more carrier frequency and the symbol rate so, recover and will regularly recover thereby finish carrier wave.Accurate more carrier frequency of this group and symbol rate can be read by master controller, and through being kept in the memory 215 as Search Results after the necessary conversion.Under the normal receiving mode, the configuration parameter of channel demodulator can be directly from " program guide ".
Channel decoder 204: channel demodulator 203 dateouts are carried out and the corresponding channel-decoding of transmitting terminal chnnel coding, comprise various forward error corrections (FEC), deinterleaving, descrambling and other necessary computings, output stream.
Source decoder 205: data stream is carried out source coding, analyze and obtain TV programme and other possible service content.
Display 206: play TV programme and other possible service content,, show the process and the result of search simultaneously as the display interface in the search procedure.
Frequency spectrum analyser 207: downconverter 202 output signals are carried out 1024 point fast Fourier conversion (FFT), obtain the discrete spectrum curve H (f) of signal.
Frequency spectrum identifier 208: the discrete spectrum curve H (f) that frequency spectrum analyser 207 is obtained carries out carrying out the linear correlation matching operation with the echo signal template.Think during when matching result and may contain the signal that can receive, then obtain carrier frequency by the center of calculating frequency spectrum greater than certain thresholding, simultaneously by calculate frequency spectrum-three dB bandwidth obtains symbol rate.Think during less than thresholding when matching result and can not contain the signal that can receive, output does not have the indication of signal.Because this analysis and identification are carried out from frequency domain,, only need in the use according to the different different echo signal templates of transmission standard definition so general and concrete modulation system is irrelevant.
Demodulation discriminator 209: by the dateout of channel demodulator 203 is analyzed, judge whether channel demodulator 203 has really locked onto on the correct received signal, and the output corresponding indicating signals.
Decoding discriminator 210: by the dateout of channel decoder 204 is analyzed, judge according to the specific rule of correct data stream whether channel decoder 204 has really recovered the data flow that needs receive, and the output corresponding indicating signals.
Auto-search controller 211: the operating state of monitoring and controlling channels demodulator 203, channel decoder 204, frequency spectrum analyser 207, frequency spectrum identifier 208, demodulation discriminator 209 and decoding discriminator 210 determines workflow between them according to the output state of each module.Simultaneously as with the intermediary interface of master controller, be responsible for receiving the enabled instruction of master control, and the process and the result of feedback search in time, the idiographic flow back describes in detail.
Control bus 212: connect master controller 214 and downconverter 202, channel decoder 204, channel decoder 204, source decoder 205 and auto-search controller 211.
Control input module 213: be used for reference carrier frequency and " search automatically " order that the user imports automatic channel search.The channel frequency hunting zone comprises the search starting point and the terminal point of channel frequency; Whether " automatically search " order is used to control automatic function of search carries out, and when carrying out " search automatically " order, master controller 214 will control downconverter 202 and begin channel is searched for from the search starting point of channel frequency, up to searching for terminal point.
Master controller 214: according to user instruction monitoring reception is the operating state of each module, output state according to each module determines workflow between them, read carrier frequency correction value and the symbol rate that searches and carry out necessary calculating, the idiographic flow back describes in detail.
Memory 215: the program and the data that are used to preserve Search Results and operation of receiver needs.
Figure 3 shows that the control flow chart of the master controller of this embodiment, specific as follows:
The initial state of master controller 214 is the reference carrier frequency of channel search to be set and to wait for that the user carries out automatic search command (301), this moment, the user can also can use the default value in the receiver software by controlling the reference carrier frequency of input module 213 inputting channels search in order to simplify the operation.If the user carries out automatic search command (302) by control input module 213, then 214 pairs of downconverters 202 of master controller are provided with the initial carrier frequency (303) of search, downconverter is transferred on this frequency, is started auto-search controller 211 (304) then.
Then, master controller 214 is by interrupting or the mode of inquiry is monitored search condition (305) in the auto-search controller 211: if search finishes and discovery channel is designated as 1, then from channel demodulator 203, read accurate carrier frequency and symbol rate by master controller 214, thereby and obtain correct carrier frequency according to the carrier frequency correction that the carrier frequency that reads is provided with downconverter 202 be kept at (306) in the memory 215 from channel demodulator 203 as Search Results, simultaneously calculate with certain stepping amount A on this correct channel carrier signal frequency basis next carrier frequency point calculate under some carrier frequency (307) to be searched; If search finishes and discovery channel is designated as 0, then calculate down some carrier frequency (308) to be searched with certain stepping amount B on the basis of current carrier frequency.If the employing inquiry mode, then master controller 214 is inquired about the state indication of auto-search controller 211 at interval with certain hour; And if adopt interrupt mode, the interrupt signal waited for from auto-search controller 211 of master controller 214 then.
When carrier frequency to be searched surpasses reference carrier frequency (309), promptly arrive the terminal point of reference carrier frequency to be searched, finish channel search (311).Otherwise downconverter 202 is provided with this carrier frequency (310) and starts auto-search controller 211 once more carry out next round search, so circulation is till carrier frequency to be searched surpasses reference carrier frequency.The display part shows the progress bar indication of search procedure in this process, and shows quantity and the parameter that searches channel, comprises carrier frequency and symbol rate.
Figure 4 shows that the control flow chart of the auto-search controller of a kind of specific embodiment of the present invention, specific as follows: auto-search controller 211 is from the wait state that resets (401), in case receive startup search instruction (402), then begin to search for automatically from master controller 214.At first start frequency spectrum analyser 207 (403), indication according to frequency spectrum analyser 207 judges whether to exist channel (404) then, if judging, frequency spectrum analyser 207 can not have channel, then finish search and the discovery channel indication is put 0 (411), otherwise start frequency spectrum identifier 208 (405).Frequency spectrum identifier 208 goes out carrier frequency and symbol rate according to the spectrum curve shape recognition, then this carrier frequency and symbol rate is started channel demodulator 203 (406) as configuration parameter.Judge channel demodulator 203 whether work correct (407) according to the indication of demodulation discriminator 209 then, 203 work are incorrect if demodulation discriminator 209 is judged channel demodulator, then search finishes and the discovery channel indication is put 0 (411), otherwise starts channel decoder 208 (408).Judge channel decoder 204 whether work correctly (409) according to the indication of decoding discriminator 210 then, if decoding discriminator 210 judges that channel decoder 204 is worked correctly then end search and discovery channel indication put 1 (410), otherwise end is searched for and the discovery channel indication puts 0 (411).
As mentioned above, the method and apparatus of fast automatic channel search is analyzed and is discerned by frequency spectrum to received signal in the Digital Television disclosed by the invention, obtain needed carrier frequency and symbol rate, and revise the parameter that identifies so that obtain more accurate result by channel demodulation and decoding.So method of the present invention can realize the fast automatic search of channel under the situation of any channel parameter of the unknown, guarantee Search Results accurately under the prerequisite the used time very short, can satisfy the user fully to simple and efficient requirement.Simultaneously,, effectively simplified control flow separately, be easy to software and hardware combined realization owing to use the dual controller framework.
Although the present invention is next specifically described with reference to its preferred embodiment, it should be appreciated by those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention that the claims qualification is arranged, can carry out the various modifications of form and details to it.
Claims (7)
1. the method for auto channel search in the Digital Television is characterized in that this method may further comprise the steps: by carrying out the identification of spectrum analysis and frequency spectrum, carrier frequency that obtains being similar to and symbol rate to received signal; Check and revise the parameter that identifies by channel demodulation and decoding, obtain more accurate result; Control workflow between spectrum analysis, frequency spectrum identification, channel demodulation and the signal decoding by a special auto-search controller, and carry out alternately with master controller; Receive user instruction by a special master controller, the operating state of each module of check receiver and workflow, and output and preservation Search Results.
2. the method for auto channel search in the Digital Television as claimed in claim 1 is characterized in that described method of carrying out spectrum analysis to received signal is to carry out fast fourier transform to the received signal, obtains the discrete spectrum curve of signal.
3. the method for auto channel search in the Digital Television as claimed in claim 1 is characterized in that described method of carrying out spectrum analysis to received signal is to carry out frequency sweep to the received signal, obtains the discrete spectrum curve of signal.
4. the method for auto channel search in the Digital Television as claimed in claim 1, it is characterized in that described method of carrying out frequency spectrum identification to received signal is that this spectrum curve and echo signal template are carried out the linear correlation matching operation, the carrier frequency that obtains being similar to by the center of calculating frequency spectrum, by calculate frequency spectrum-symbol rate that three dB bandwidth obtains being similar to.
5. the method for auto channel search in the Digital Television as claimed in claim 1, it is characterized in that describedly checking and the method for revising the parameter that identifies may further comprise the steps by channel demodulation and decoding: downconverter transforms to the radiofrequency signal of input on the needed appropriate frequency of channel demodulation module; Under the auto-search controller control, the approximate carrier frequency and the symbol rate that obtain with frequency spectrum identification start channel demodulation as the initialization parameter, and signal is carried out carrier wave recover and regularly recover, and the channel compensation that may need; Dateout to channel demodulator is analyzed, and judges whether channel demodulator has really locked onto on the correct received signal, and judged result is exported to auto-search controller; Auto-search controller control starts channel decoder down, and the channel demodulation dateout is carried out and the corresponding channel-decoding of transmitting terminal chnnel coding, comprises various forward error corrections, deinterleaving, descrambling and other possible computings, output stream; Dateout to channel decoder is analyzed, and judges the data flow that whether channel-decoding has really recovered needs reception, and judged result is exported to auto-search controller; If channel demodulation and channel-decoding can both be locked on the correct received signal, show then to have searched a channel that at this moment the running parameter of channel demodulation and channel-decoding is exactly the channel parameter accurately through check and correction; If channel demodulation and channel-decoding can not be locked on the correct received signal, show that then approximate carrier frequency and the symbol rate that frequency spectrum identification obtains is wrong.
6. the method for auto channel search in the Digital Television as claimed in claim 1, the control flow that it is characterized in that described auto-search controller is: auto-search controller is from the wait state that resets, in case receive startup search instruction, then begin to search for automatically from master controller; At first start spectrum analysis, can not have channel, then finish search and the discovery channel indication is put 0, otherwise start frequency spectrum identification if spectrum analysis is judged; Start after the frequency spectrum identification, go out carrier frequency and symbol rate, then this carrier frequency and symbol rate are started channel demodulator as configuration parameter according to the spectrum curve shape recognition; If judge that channel demodulation work is incorrect, then search finishes and the discovery channel indication is put 0, otherwise starts channel decoder; Start after the channel decoder,, otherwise finish search and the discovery channel indication is put 0 if judge channel-decoding work correctly then finish search and the discovery channel indication puts 1.
7. the method for auto channel search in the Digital Television as claimed in claim 1, the control flow that it is characterized in that described master controller is: when the user imports the automatic channel search order, starting point from reference carrier frequency to be searched, downconverter is provided with carrier frequency to be searched, starts auto-search controller then; Search condition in the master controller monitoring auto-search controller, if search finishes and discovery channel is designated as 1, then starting source decoder decodes to data stream, analysis obtains TV programme and other possible service content, calculate and store carrier frequency corresponding and symbol rate simultaneously, and calculate down some carrier frequency to be searched with certain stepping amount; If search finishes and discovery channel is designated as 0, then calculate down some carrier frequency to be searched with certain stepping amount; When surpassing reference carrier frequency, carrier frequency to be searched finishes channel search, otherwise downconverter is provided with this carrier frequency to be searched and starts auto-search controller once more carry out next round search, so circulation is till carrier frequency to be searched surpasses reference carrier frequency; The quantity and the parameter of channel indicated and searched to the progress bar of demonstration search procedure in this process, comprises carrier frequency and symbol rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100542798A CN100342724C (en) | 2004-09-03 | 2004-09-03 | Automatic channel searching method in digital Tv-set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100542798A CN100342724C (en) | 2004-09-03 | 2004-09-03 | Automatic channel searching method in digital Tv-set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1615004A true CN1615004A (en) | 2005-05-11 |
| CN100342724C CN100342724C (en) | 2007-10-10 |
Family
ID=34764220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100542798A Active CN100342724C (en) | 2004-09-03 | 2004-09-03 | Automatic channel searching method in digital Tv-set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100342724C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236055A (en) * | 2010-04-30 | 2011-11-09 | 东莞华仪仪表科技有限公司 | Automatic frequency selection method |
| CN105516798A (en) * | 2015-12-17 | 2016-04-20 | 深圳Tcl数字技术有限公司 | Channel search method and system for television terminal |
| CN108259980A (en) * | 2017-12-29 | 2018-07-06 | 伟乐视讯科技股份有限公司 | A kind of dynamic signal search method |
| CN115801030A (en) * | 2022-10-13 | 2023-03-14 | 成都老鹰信息技术有限公司 | Carrier automatic searching system and searching method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100233410B1 (en) * | 1997-06-24 | 1999-12-01 | 윤종용 | Method for updating electronic program guide information and device thereof in a disital tv receiver |
| CN1168227C (en) * | 1998-10-05 | 2004-09-22 | 株式会社Aor | Wideband receiver and channel scanning method |
| KR100311479B1 (en) * | 1999-10-06 | 2001-10-18 | 구자홍 | Method and apparatus for controlling channel of digital TV |
| JP2001245233A (en) * | 2000-02-28 | 2001-09-07 | Pioneer Electronic Corp | Device and method for displaying program guide |
| JP3733097B2 (en) * | 2002-09-13 | 2006-01-11 | 三洋電機株式会社 | Broadcast receiving apparatus and broadcast receiving method |
-
2004
- 2004-09-03 CN CNB2004100542798A patent/CN100342724C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236055A (en) * | 2010-04-30 | 2011-11-09 | 东莞华仪仪表科技有限公司 | Automatic frequency selection method |
| CN102236055B (en) * | 2010-04-30 | 2015-11-25 | 东莞华仪仪表科技有限公司 | Automatic frequency selection method |
| CN105516798A (en) * | 2015-12-17 | 2016-04-20 | 深圳Tcl数字技术有限公司 | Channel search method and system for television terminal |
| WO2017101264A1 (en) * | 2015-12-17 | 2017-06-22 | 深圳Tcl数字技术有限公司 | Channel searching method and system for television terminal |
| CN105516798B (en) * | 2015-12-17 | 2019-03-01 | 深圳Tcl数字技术有限公司 | Television terminal channel search method and system |
| CN108259980A (en) * | 2017-12-29 | 2018-07-06 | 伟乐视讯科技股份有限公司 | A kind of dynamic signal search method |
| CN115801030A (en) * | 2022-10-13 | 2023-03-14 | 成都老鹰信息技术有限公司 | Carrier automatic searching system and searching method thereof |
| CN115801030B (en) * | 2022-10-13 | 2023-09-26 | 成都老鹰信息技术有限公司 | Carrier automatic search system and search method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100342724C (en) | 2007-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7650616B2 (en) | Methods and apparatus for identifying audio/video content using temporal signal characteristics | |
| CN101175060A (en) | System, apparatus, and method for processing a received orthogonal frequency division multiplexing signal | |
| CN1902914A (en) | Apparatus and method for use in television channel mapping | |
| CN1300399A (en) | Transmitter, receiver, transmitter/receiver system, transmission method and reception method | |
| CN1802832A (en) | Faster fine timing operation in multi-carrier wave system | |
| CN101667208A (en) | Digital television receiver and methods for searching and switching programs thereof | |
| CN103533435A (en) | Set-top box with two systems and double-system communication method | |
| CN100342724C (en) | Automatic channel searching method in digital Tv-set | |
| CN101472097B (en) | Digital television receiver and method for searching program automatically in empty status | |
| CN1381132A (en) | Channel selection apparatus | |
| CN1595962A (en) | Receiver and receiving method and program | |
| CN1205817C (en) | Method for determining parameters of an OFDM and associated receiver | |
| EP2884755A1 (en) | Iptv program searching method, device and system | |
| CN101049029A (en) | System and method for automatically performing a channel selection procedure in a wireless network | |
| CN114898583B (en) | Signal lamp control scheme determining method and data processing method of intelligent traffic equipment | |
| US20140173668A1 (en) | Fast blind scan method insensitive to adjacent channel interference | |
| CN1285210C (en) | Broadcast program installing method and device | |
| CN1124699C (en) | Method for modifying channel impulse response in TDMA systems | |
| CN1659891A (en) | System for the dynamic multiplexing of digital streams | |
| CN1728826A (en) | Method for management of auxiliary programs and corresponding receiver and system | |
| CN115459835B (en) | Broadband satellite signal intelligent identification system | |
| CN101257584A (en) | Channel searching system of movable digital television | |
| CN105657415A (en) | Method for automatically detecting set top box and terminal | |
| CN1357983A (en) | Restoration of initial grouping sent by terminal utilizing return channel in group transmission system | |
| CN104104896B (en) | Video signal decoding apparatus and associated method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: No. 90, Wensanlu Road, Hangzhou, Zhejiang, Xihu District Patentee after: Hangzhou National Chip Science & Technology Co., Ltd. Address before: 5A, Neusoft building, No. 99 Huaxing Road, Zhejiang, Hangzhou Patentee before: Hangzhou Guoxin Science & Technology Co., Ltd. |