CN102413366A - Method and device for searching channels in digital television - Google Patents
Method and device for searching channels in digital television Download PDFInfo
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- CN102413366A CN102413366A CN2011103960150A CN201110396015A CN102413366A CN 102413366 A CN102413366 A CN 102413366A CN 2011103960150 A CN2011103960150 A CN 2011103960150A CN 201110396015 A CN201110396015 A CN 201110396015A CN 102413366 A CN102413366 A CN 102413366A
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Abstract
The invention discloses a method and a device for searching channels in a digital television. The method comprises the following steps: A) acquiring present NIT (Network Information Table) information in a present frequency point TS (Transport Stream) data stream of a tuner, and B) judging if the present NIT information is valid, and if the present NIT information is invalid and the digital television is under a state of non-TV information source, acquiring the frequency point information corresponding to the last stored NIT information, further acquiring the NIT information in the frequency point TS data stream and automatically updating programs according to the NIT information. The method and device provided by the invention are used for solving the problem that the automatic updating of programs cannot be activated when the tuner of the present digital television confirms that the NIT is not contained or the frequency point of the frequency point information of the whole network is not described by the NIT, and are used for realizing the quick and accurate updating for the programs of the digital television.
Description
Technical field
The present invention relates to the digital television techniques field, in particular to a kind of channel search method and device that is used for DTV.
Background technology
At present; The mode that the program of DTV upgrades automatically is; PSI/SI (Program Specific Information/Service Information at the frequency receiving digital signals that locks; PSI/SI), comprise NIT (Network Information Table, network information table) in the said PSI/SI information at least.The Version version that the NIT that has stored through Version version in the current NIT table that will get access to and television set shows is compared; If finding the Version version upgrades; Then activate the automatic renewal of TV programme; Catch frequency point information and information on services in the NIT table of current frequency, to accomplish the automatic renewal of TV programme.
In the digital television signal of reality; Because the standard of TV station's scale of various places and use is inconsistent; Might in through the PSI/SI information that locks the digital signal that current frequency receives, not comprise the NIT table; Do not describe the frequency point information of whole network in the NIT that perhaps the receives table, and do not point to other and comprise the Linkage descriptor that whole network is described the frequency of NIT.The channel that will cause digital signal like this is when changing, and the automatic renewal of DTV can't be activated, the function that causes the DTV forfeiture to be upgraded automatically.
In Chinese publication " denomination of invention: the method for searching channels of all-in-one digital television; Application number: 200810067838.7 " in a kind of method of number TV searching channels of all-in-one is disclosed; But this method needs the current digit TV to be in the TV information source; And the TS frequency that requires the locking of its tuner to include whole network NIT just can be searched platform, yet its, if the locking of the tuner of current digit TV is when not comprising NIT table or NIT table and not describing the channel of frequency point information of whole network; Adopt the automatically updating function that this method can't activated digital TV, can't realize the automatic renewal of DTV.
In Chinese publication " denomination of invention: the method for TV set to search programmes; Application number: 200810217422.9 " in a kind of method of number TV set to search programmes is disclosed; In the method; Digital television can carry out automatic channel search using under the situation of non-TV information source, and etc. go the comparison channel whether to upgrade again after searching platform and finishing.But adopt this method; No matter whether channel upgrades, and all will search the platform operation, thereby has increased the operation burden of system; And because of this method is to adopt by frequency to search platform; So search the platform overlong time, the user is very likely interrupted owing to the redirect information source causes searching platform in actual mechanical process, causes its availability not good enough thus.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of channel search method and device that is used for DTV; Its to the tuner of current digit TV when locking does not comprise NIT table or NIT table and does not describe the frequency of frequency point information of whole network; The problem that the automatic renewal of program can't activate adopts this invention can fast and accurately carry out the renewal of digital television program.
In order to reach the object of the invention, the present invention adopts following technical scheme to realize:
A kind of channel search method that is used for DTV comprises the steps:
A, obtain the current NIT information in the tuner current frequency TS data flow of living in;
B, judge whether said current NIT information is effective; If current NIT information is invalid; And when DTV is in non-TV information source; Obtain the pairing frequency point information of last NIT information of storage, further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.
Preferably, in said step B, the NIT information in the pairing frequency TS of the last NIT information data flow of obtaining and storing also according to the automatic method for updating of this NIT information and executing program is:
The pairing frequency of last NIT information of B1, tuner locking and storage also obtains the TS data flow;
B2, obtain the NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
Preferably, also comprise after in steps carrying out institute:
C, effective if judgement draws said current NIT information; Then the version information with the last NIT information of the version information of said current NIT information and storage compares; When version updating, the detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically.
Preferably, in said step B, judge whether effective method is said current NIT information:
When the table identification code Table_ID that comprises when said current NIT information was 0x40, then expression this current NIT information was effective, when table identification code Table_ID is 0x41, represented that then this current NIT information is invalid.
A kind of channel search method that is used for DTV; When DTV is in the TV information source; And in the time of can't from the TS data flow of the current frequency that gets access to, parsing NIT information, then when DTV is in non-TV information source, obtain the pairing frequency point information of last NIT information of storage; Further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.
Preferably, the automatic method for updating of said execution program is:
The version information of the last NIT information of the version information of said NIT information and storage is compared, and when version updating, the detailed frequency information that then comprises according to this NIT information upgrades with service information and executing program automatically.
A kind of table apparatus of searching that is used for DTV comprises:
The tuner module is used to obtain the TS data flow of current frequency;
Demodulation and demultiplexing module are used for going out current NIT information from said TS parsing of the data stream;
Control module is used to judge whether said current NIT information is effective, if current NIT information is invalid, then when DTV is in non-TV information source, then sends the first program update command to the program updating module;
The program updating module is used for obtaining the pairing frequency point information of last NIT information of storage according to the said first program update command, further obtains the NIT information in this frequency TS data flow, and upgrades automatically according to this NIT information and executing program;
Memory module is used to store the NIT information that demodulation and demultiplexing module parse.
Preferably, the NIT information in the said program updating module pairing frequency TS of the last NIT information data flow of obtaining and storing and be according to the automatic method for updating of this NIT information and executing program:
The locking of control tuner module is with the pairing frequency of storing of last NIT information and obtain the TS data flow;
Obtain the NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
Preferably, draw said current NIT information when effective, then send the order of second program updating to said program updating module if said control module is judged; Said program updating module is further used for the version information of the last NIT information of the version information of said current NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically.
Preferably, said control module judges whether effective method is said current NIT information:
When the table identification code Table_ID that comprises when said current NIT information was 0x40, then expression this current NIT information was effective, when table identification code Table_ID is 0x41, represented that then this current NIT information is invalid.
Preferably; Said control module also is used for being in the TV information source when DTV; And when said demodulation and demultiplexing module can't parse NIT information from the TS data flow of the current frequency that gets access to; Then draw when DTV switches to non-TV information source and continue a preset delay time, send the order of the 3rd program updating to said program updating module in judgement; Said program updating module is further used for obtaining the pairing frequency point information of last NIT information of storage, further obtains the NIT information in this frequency TS data flow, and upgrades automatically according to this NIT information and executing program.
Technical scheme through the invention described above can be found out, channel search method and the device that is used for DTV provided by the invention, and when the user watched digital program, whether the NIT information of DTV detecting real-time digital signal was effective.If invalid, DTV when watching DVD under the HDMI information source (for example DTV is in standby or in non-TV information source, as) under non-TV information source state then, DTV moves the program updating module of digital television program automatically.The NIT information that program updating modules capture current digit TV has been stored; Judge the concrete frequency that comprises the NIT table; The program updating module is then utilized this concrete frequency of tuner locking, directly catches the frequency point information and the information on services of the NIT table of this frequency, obtains the TV programme in the network again; And upgrade current the rendition list, accomplish the renewal of digital television program.
Description of drawings
Fig. 1 is the channel search method schematic flow sheet that is used for DTV that the embodiment of the invention provides;
Fig. 2 be the embodiment of the invention provide be used for DTV search the table apparatus structural representation.
The realization of the object of the invention, functional characteristics and excellent effect will combine specific embodiment and accompanying drawing to do further explanation below.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment technical scheme according to the invention is done further to describe in detail so that those skilled in the art can better understand the present invention and can implement, but the embodiment that lifts not conduct to qualification of the present invention.
The embodiment of the invention provides a kind of channel search method that is used for DTV, and it comprises the steps:
S101, system for TV set initiatively obtain the current NIT information in the tuner current frequency TS data flow of living in;
S102, judge whether said current NIT information is effective; If current NIT information is invalid; Then when DTV is in non-TV information source; Obtain the pairing frequency point information of last NIT information of storage, further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.In this step; Under the preferred implementation; Judge whether effective method is said current NIT information: when the table identification code Table_ID that comprises when said current NIT information is 0x40; Then this current NIT information of expression is effective, and when table identification code Table_ID was 0x41, then this current NIT information of expression was invalid.In addition, in the specific implementation, when DTV switches to non-TV information source by current TV information source and continue a preset delay time, think that then the current digit TV is in non-TV information source, just carry out above-mentioned program and upgrade operation automatically this moment.
In embodiments of the present invention; System opens up memory space in advance; The EEP_NIT_FRE that for example opens up is used to store the frequency information of the frequency that has effective NIT table; EEP_NIT_Modulation is used to store the modulation intelligence of this frequency, and EEP_NIT_Symbolrate is used to store the symbol rate information of this frequency.During system initialization, EEP_NIT_FRE is initialized to 0xFFFFFFFF, and EEP_NIT_Modulation is initialized to 0xFF, and EEP_NIT_Symbolrate is initialized to 0xFFFFFFF.After DTV carried out searching platform the first time, the frequency frequency information that will have the NIT table was given EEP_NIT_FRE, and the modulation intelligence of this frequency is composed to EEP_NIT_Modulation, and the symbol rate information of this frequency is composed to EEP_NIT_Symbolrate.
Under the preferred implementation, in said step S102, the NIT information in the pairing frequency TS of the last NIT information data flow of obtaining and storing also according to the automatic method for updating of this NIT information and executing program is:
The pairing frequency of last NIT information of S1021, tuner locking and storage also obtains the TS data flow;
S1022, obtain the NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
Preferably, also comprise after in steps carrying out institute:
S103, effective if judgement draws said current NIT information; Then the version information with the last NIT information of the version information of said current NIT information and storage compares; When version updating, the detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically.
In embodiments of the present invention; When DTV during in the TV information source; PID (Packet Identifier in the DTV meeting active lock-on signal (being the TS data flow of current frequency); The identification of data packets sign indicating number) be the packet of 0x0010, in these pid data bags, defined NIT, the NIT table has then defined all frequency point information and the information on services of current demand signal network.Variation has taken place in program in the signal that TV and Radio Service sends, and for example increases or reduced channel.The NIT table of transmission also just changes immediately.After DTV detects the difference of these data, can upgrade by automatic channel list original storage.
The TS data flow of the current frequency that DTV gets access to; After capturing the packet that PID is 0x0010; DTV can be analyzed the data of NIT table, and wherein Table_ID (Table identifier, table identification code) is 0x40; What then represent this NIT table description is current network information, is effective channel information and information on services; If Table_ID is 0x41, then expression is to describe other network informations, is invalid NIT table.In this embodiment, DTV can't get access to the frequency point information of current network and the renewal of information on services through invalid NIT table.So when DTV was in the frequency that does not comprise effective NIT, the TS data flow that this frequency transmitted did not have the information of program updating always, DTV can't capture program updating, can't activate the function that program upgrades automatically.
The TV software defined variable NIT_ERROR and the LOCAL_UPDATE of DTV, when starting shooting, NIT_ERROR is initialized as True at every turn; LOCAL_UPDATE is initialized as False; When TV during, initiatively detect digital signal and whether comprise the packet that PID is 0x0010, if any comprising in the TV information source; Whether be 0x40, judge whether NIT is effective if then detecting Table_ID.If effectively, then NIT_ERROR is changed to false, otherwise said NIT_ERROR still is True.DTV compares the version Version information of the NIT in the current demand signal and the NIT version Version information of DTV storage; Whether thereby differentiating said NIT version Version upgrades; As upgrading; Then obtain detailed frequency point information and the information on services of the NIT in this current demand signal, and according to of the renewal of said detailed frequency point information, and LOCAL_UPDATE is changed to True with service information and executing program; Do not upgrade like the NIT version, then do not carry out the renewal of program, will be changed to False by LOCAL_UPDATE simultaneously.
When DTV gets into non-TV information source, for example forward the HDMI information source to, timer is opened; After waiting for a preset delay time; For example after 5 minutes, detect TV still in the HDMI information source, this moment, the TV software of DTV judged that NIT_ERROR is that True and LOCAL_UPDATE are when being False; Then activate the program updating module, carry out the renewal of program.Otherwise, show that then DTV recognizes correct NIT.The program updating module reads the EEP_NIT_FRE in the memory module (for example EEPROM), EEP_NIT_Modulation and EEP_NIT_Symbolrate, and for example, frequency is 474MHz, be modulated to 128QAM, symbol rate is 6875ksym/s.The program updating module is provided with this frequency of tuner locking, obtains current demand signal at the NIT of 474MHz table, and obtains effective whole network frequency point information and information on services.And the said whole network frequency point information of obtaining compared with the channel program of current storage with information on services, carry out the newly-increased or deletion of program, thereby accomplish the renewal of channel program.
As shown in Figure 1, it is the channel search method schematic flow sheet that is used for DTV that the embodiment of the invention provides, and it comprises following concrete steps:
1, behind the digital television opening, it is True that the TV software through DTV is provided with initializaing variable NIT_ERROR, and LOCAL_UPDATE is false;
2, obtain the NIT packet of the digital signal of current frequency, and judge whether NIT effective?
3, invalid like the NIT that obtains, then change step 7;
4, effective like the NIT that obtains, then through relatively the NIT version Version of NIT data and the last NIT version of storage upgrade to judge NIT?
5, if any renewal, then catch the NIT data, carry out NIT and upgrade, wherein said NIT upgrades and comprises and upgrade whole network frequency point information and information on services, and to put LOCAL_UPDATE be True;
6, do not upgrade as having, change step 7;
7, judge whether DTV forwards non-TV information source to;
8, judge whether NIT_ERROR is True, and LOCAL_UPDATE is false?
9, as not, change step 16;
10, in this way, DTV reads the NIT frequency point information of memory EEPROM, and NIT_ERROR is changed to False;
11, read the NIT table, obtain NIT version Version information;
Does 12, relatively NIT version Version upgrade?
13, as not, change step 16;
14, in this way, obtain frequency point information and the information on services of the NIT under this frequency signal, carry out program updating, and LOCAL_UPDATE is changed to True;
15, the program updating situation is informed the user;
16, finish.
The TS data flow of the current frequency that DTV gets access to, if it does not comprise the packet that PID is 0x0010, that just means that the NIT table does not transmit in signal.At this moment, the channel search method that is used for DTV below can adopting is carried out program and is upgraded automatically.
A kind of channel search method that is used for DTV; When DTV is in the TV information source; And in the time of can't from the TS data flow of the current frequency that gets access to, parsing NIT information, then when DTV is in non-TV information source, obtain the pairing frequency point information of last NIT information of storage; Further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.In the specific implementation, likewise, when DTV switches to non-TV information source by current TV information source and continue a preset delay time, think that then the current digit TV is in non-TV information source, just carry out above-mentioned program and upgrade operation automatically this moment.
Wherein, the automatic method for updating of said execution program is:
The version information of the last NIT information of the version information of said NIT information and storage is compared, and when version updating, the detailed frequency information that then comprises according to this NIT information upgrades with service information and executing program automatically.
As shown in Figure 2, the embodiment of the invention also provides a kind of table apparatus of searching that is used for DTV, comprising:
Demodulation and demultiplexing module 20 are used for going out current NIT information from said TS parsing of the data stream;
Wherein, when DTV switches to non-TV information source by current TV information source and continue a preset delay time, think that then the current digit TV is in non-TV information source, just carry out above-mentioned program and upgrade operation automatically this moment.Said preset delay time can be preestablished by user or manufacturer voluntarily, it is not done too much give unnecessary details here.
Wherein, the NIT information in the said program updating module 40 pairing frequency TS of the last NIT information data flow of obtaining and storing and be according to the automatic method for updating of this NIT information and executing program:
1, control tuner module 10 locks with the pairing frequency of storing of last NIT information and obtains the TS data flow;
2, obtain NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
Draw said current NIT information when effective if said control module 30 is judged, then send the order of second program updating to said program updating module 40; Said program updating module 40 is further used for the version information of the last NIT information of the version information of said current NIT information and storage is compared; When version updating; The detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically; Wherein, said control module 30 judges whether effective method is said current NIT information: when the table identification code Table_ID that comprises when said current NIT information was 0x40, then this current NIT information of expression was effective; When table identification code Table_ID was 0x41, then this current NIT information of expression was invalid.
Under the preferred implementation; Said control module 30 also is used for being in the TV information source when DTV; And when said demodulation and demultiplexing module 20 can't parse NIT information from the TS data flow of the current frequency that gets access to; Then draw when DTV switches to non-TV information source and continue a preset delay time, send the order of the 3rd program updating to said program updating module 40 in judgement; Said program updating module 40 is further used for obtaining the pairing frequency point information of last NIT information of storage, further obtains the NIT information in this frequency TS data flow, and upgrades automatically according to this NIT information and executing program.
In addition; Under the preferred implementation; The said table apparatus of searching that is used for DTV also comprises the display module (not shown), and said display module is used for showing the channel alteration situation after the automatic renewal, and the OSD of this display module can be provided with the duration of display reminding information; After 2 seconds, disappear automatically, in order to avoid influence user's normal viewing.If captured the channel of renewal but storage is not when finishing as yet, this display module also is used for pointing out the user signal languages such as " channel program are still upgrading, and just a moment,please ".
In addition; In the practical implementation process; The said table apparatus of searching that is used for DTV also comprises remote control signal receiving module 60, and what it was used for receiving user's input searches the platform remote control mode, and remote control mode is transferred to MCU; For example receive that the user sends the TV information source to the switching command of HDMI information source and forward it to control module, thereby make control module can the TV information source at current digit TV place be switched to the HDMI information source.
In sum, channel search method and the device that is used for DTV provided by the invention, when the user watched digital program, whether the NIT information of DTV detecting real-time digital signal was effective.If invalid, DTV when watching DVD under the HDMI information source (for example DTV is in standby or in non-TV information source, as) under non-TV information source state then, DTV moves the program updating module 40 of digital television program automatically.Program updating module 40 is caught the NIT information that the current digit TV has been stored, judges the concrete frequency that comprises the NIT table.40 of program updating modules are utilized this concrete frequency of tuner locking, directly catch the frequency point information and the information on services of the NIT table of this frequency, obtain the TV programme in the network again, and upgrade current the rendition list, accomplish the renewal of digital television program.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (11)
1. a channel search method that is used for DTV is characterized in that, comprises the steps:
A, obtain the current NIT information in the tuner current frequency TS data flow of living in;
B, judge whether said current NIT information is effective; If current NIT information is invalid; And when DTV is in non-TV information source; Obtain the pairing frequency point information of last NIT information of storage, further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.
2. the channel search method that is used for DTV as claimed in claim 1; It is characterized in that; In said step B, the NIT information in the pairing frequency TS of the last NIT information data flow of obtaining and storing also according to the automatic method for updating of this NIT information and executing program is:
The pairing frequency of last NIT information of B1, tuner locking and storage also obtains the TS data flow;
B2, obtain the NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
3. the channel search method that is used for DTV as claimed in claim 1 is characterized in that, also comprises after in steps carrying out institute:
C, effective if judgement draws said current NIT information; Then the version information with the last NIT information of the version information of said current NIT information and storage compares; When version updating, the detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically.
4. like claim 1 or the 3 described channel search methods that are used for DTV, it is characterized in that in said step B, judge whether effective method is said current NIT information:
When the table identification code Table_ID that comprises when said current NIT information was 0x40, then expression this current NIT information was effective, when table identification code Table_ID is 0x41, represented that then this current NIT information is invalid.
5. channel search method that is used for DTV; It is characterized in that, when DTV is in the TV information source, and can't from the TS data flow of the current frequency that gets access to, parse NIT information the time; Then when DTV is in non-TV information source; Obtain the pairing frequency point information of last NIT information of storage, further obtain the NIT information in this frequency TS data flow, and upgrade automatically according to this NIT information and executing program.
6. the channel search method that is used for DTV as claimed in claim 5 is characterized in that, the automatic method for updating of said execution program is:
The version information of the last NIT information of the version information of said NIT information and storage is compared, and when version updating, the detailed frequency information that then comprises according to this NIT information upgrades with service information and executing program automatically.
7. the table apparatus of searching that is used for DTV is characterized in that, comprising:
The tuner module is used to obtain the TS data flow of current frequency;
Demodulation and demultiplexing module are used for going out current NIT information from said TS parsing of the data stream;
Control module is used to judge whether said current NIT information is effective, if current NIT information is invalid, then when DTV is in non-TV information source, then sends the first program update command to the program updating module;
The program updating module is used for obtaining the pairing frequency point information of last NIT information of storage according to the said first program update command, further obtains the NIT information in this frequency TS data flow, and upgrades automatically according to this NIT information and executing program;
Memory module is used to store the NIT information that demodulation and demultiplexing module parse.
8. the table apparatus of searching that is used for DTV as claimed in claim 7; It is characterized in that the NIT information in the pairing frequency TS of the last NIT information data flow that said program updating module is obtained and stored also according to the automatic method for updating of this NIT information and executing program is:
The locking of control tuner module is with the pairing frequency of storing of last NIT information and obtain the TS data flow;
Obtain the NIT information in this frequency TS data flow; The version information of the last NIT information of the version information of said NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to this NIT information upgrades with service information and executing program automatically.
9. the table apparatus of searching that is used for DTV as claimed in claim 7 is characterized in that, draws said current NIT information when effective if said control module is judged, then sends the order of second program updating to said program updating module; Said program updating module is further used for the version information of the last NIT information of the version information of said current NIT information and storage is compared; When version updating, the detailed frequency information that comprises according to current NIT information upgrades with service information and executing program automatically.
10. like claim 7 or the 9 described table apparatus of searching that are used for DTV, it is characterized in that said control module judges whether effective method is said current NIT information:
When the table identification code Table_ID that comprises when said current NIT information was 0x40, then expression this current NIT information was effective, when table identification code Table_ID is 0x41, represented that then this current NIT information is invalid.
11. the table apparatus of searching that is used for DTV as claimed in claim 7; It is characterized in that; Said control module also is used for being in the TV information source when DTV; And when said demodulation and demultiplexing module can't parse NIT information from the TS data flow of the current frequency that gets access to, then draw when DTV switches to non-TV information source and continue a preset delay time, send the order of the 3rd program updating to said program updating module in judgement; Said program updating module is further used for obtaining the pairing frequency point information of last NIT information of storage, further obtains the NIT information in this frequency TS data flow, and upgrades automatically according to this NIT information and executing program.
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| CN102780922A (en) * | 2012-07-03 | 2012-11-14 | 深圳Tcl新技术有限公司 | Digital television channel searching method and channel searching system |
| CN103596047A (en) * | 2013-11-08 | 2014-02-19 | 上海大亚科技有限公司 | Method for achieving fast restoration under abnormal conditions of set top box tuner |
| CN103647983A (en) * | 2013-12-30 | 2014-03-19 | 深圳Tcl新技术有限公司 | Channel searching method and channel searching system of digital television |
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