CN103647983A - Channel searching method and channel searching system of digital television - Google Patents
Channel searching method and channel searching system of digital television Download PDFInfo
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- CN103647983A CN103647983A CN201310744448.XA CN201310744448A CN103647983A CN 103647983 A CN103647983 A CN 103647983A CN 201310744448 A CN201310744448 A CN 201310744448A CN 103647983 A CN103647983 A CN 103647983A
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Abstract
The invention discloses channel searching method and a channel searching system of a digital television. The method comprises the following steps: when receiving a confirming command of automatically searching channels sent by a user, the digital television sends a request of obtaining Network Information Table (NIT) information to a data card and receives the fed NIT information from the data card; when receiving the NIT information, the digital television analyzes the received NIT information to obtain network information, frequency point list information and program list information; the digital television detecting signals in the frequency points of the frequency point list information updates PMT (Program Map Table) and PAT (Program Association Table) to search channels. By adopting the channel searching method and the channel searching system, the channel searching speed is extremely improved, and the user experience is enhanced.
Description
Technical field
The present invention relates to digital TV field, specially refer to a kind of Digital Television channel search method and system.
Background technology
At present, the automatic channel search mode of Digital Television mainly contains two kinds, is respectively full range point tuning and quick channel search.Wherein, while adopting full range point tuning, Digital Television is generally from low frequency to high-frequency order tuning, and this tuning process generally needs about 20 minutes, has the longer shortcoming of tuning required time.Quick channel search utilizes NIT(Network Information Table, network information table) and SDT(Service Descriptor Table, service describing table) realize tuning, first need to find NIT information, then from NIT information, extract Frequency List Descriptor(list of frequency descriptor), utilize list of frequency descriptor with frequency information, navigate to fast the Frequency point that each has signal, from SDT data, obtain programme information simultaneously, thereby complete quick channel search, and system need to remain NIT, SDT, PMT(Program Map Table, Program Map Table), PAT(Program Association Table, Program Association Table) renewal of the table monitoring such as, but this mode is difficult to be applied to digital TV integrated machine, because orient towards the whole country, the digital TV integrated machine in market cannot be determined the Frequency point at NIT place.
Summary of the invention
Main purpose of the present invention, for a kind of Digital Television channel search method and system are provided, is intended to improve tuning speed.
The invention provides a kind of Digital Television channel search method, the method comprises:
Digital Television, when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card, and from described data card, receives the NIT information of feedback;
Described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, to obtain the network information, frequency list information and program list information;
When described Digital Television detects signal on the Frequency point of described frequency list information, upgrade pmt table and pat table, to carry out tuning.
Preferably, described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, and after obtaining the step of the network information, frequency list information and program list information, the method also comprises:
Described Digital Television is mapped the described network information, frequency list information and program list information, sets up complete program data, and preserves described program data.
Preferably, described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, and to obtain the step of the network information, frequency list information and program list information, comprises:
Described Digital Television, when receiving described NIT information, extract link descriptor, and arrangement obtains the network information from described NIT information; And from described NIT information, extract transmission descriptor, and arrangement obtains frequency list information; And extract program descriptor from described NIT information, and arrangement obtains program list information.
Preferably, described Digital Television, when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card, and receive the step of NIT information of feedback from described data card before, the method also comprises:
The second tuning state information that described Digital TV Receiving data card sends, and to user, send the whether inquiry instruction of automatic channel search according to described the second tuning state information.。
Preferably, the second tuning state information that described Digital TV Receiving data card sends, and the step of sending the whether inquiry instruction of automatic channel search to user according to this second tuning state information comprises:
The second tuning state information that described Digital TV Receiving data card sends, and read the first tuning state information of described Digital Television storage;
Whether described Digital Television is analyzed described the second tuning state information identical with the first tuning state information;
If described the second tuning state information is not identical with the first tuning state information, described Digital Television is obtained automatic quick channel search command information from described data card, if do not have the version number of the version number of NIT information in NIT information or described automatic quick channel search command information and the NIT information of the current preservation of described Digital Television inconsistent in described automatic quick channel search command information, described Digital Television is sent the whether inquiry instruction of automatic channel search to user.
The present invention also provides a kind of Digital Television channel searching system, and this system comprises Digital Television and data card, and described Digital Television comprises transceiver module, parsing module, search module, wherein:
Described transceiver module, for when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card, and from described data card, receives the NIT information of feedback;
Described parsing module, for resolving the NIT information of reception, to obtain the network information, frequency list information and program list information;
Described search module, when signal being detected on the Frequency point at described frequency list information, upgrades pmt table and pat table, to carry out tuning.
Preferably, described Digital Television also comprises to be set up module and preserves module, and the described module of setting up, for the described network information, frequency list information and program list information are mapped, is set up complete program data; Described preservation module is used for preserving described program data.
Preferably, described parsing module comprises:
The first resolution unit, for extract link descriptor from described NIT information, and arrangement obtains the network information;
The second resolution unit, for extract transmission descriptor from described NIT information, and arrangement obtains frequency list information;
The 3rd resolution unit, for extracting program descriptor from described NIT information, and arrangement obtains program list information.
Preferably, described transceiver module comprises the first Transmit-Receive Unit, the second tuning state information that described the first Transmit-Receive Unit sends for receiving data card, and to user, send the whether inquiry instruction of automatic channel search according to described the second tuning state information.
Preferably, the second tuning state information that described the first Transmit-Receive Unit also sends for receiving data card, and read the first tuning state information of described Digital Television storage; And whether identical with the first tuning state information for analyzing described the second tuning state information; And in described the second tuning state information with the first tuning state information when not identical, from described data card, obtain automatic quick channel search command information, if do not have the version number of the version number of NIT information in NIT information or described automatic quick channel search command information and the NIT information of the current preservation of described Digital Television inconsistent in described automatic quick channel search command information, to user, send the whether inquiry instruction of automatic channel search.
Adopt digital channel search method and the system of the embodiment of the present invention, by Digital Television, directly from data card, obtain NIT information, again the NIT information of obtaining is resolved and obtained frequency list information, while signal being detected on the Frequency point of frequency frequency list information, upgrade pmt table and pat table, to carry out tuning; Can improve tuning speed, promote user experience.
Accompanying drawing explanation
Fig. 1 is the first embodiment schematic flow sheet of Digital Television channel search method of the present invention;
Fig. 2 is the second embodiment schematic flow sheet of Digital Television channel search method of the present invention;
Fig. 3 is the 3rd embodiment schematic flow sheet of Digital Television channel search method of the present invention;
Fig. 4 is the detailed process schematic diagram of step S50 in Fig. 3;
Fig. 5 is the preferred embodiment structural representation of Digital Television channel searching system of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, Fig. 1 is the first embodiment schematic flow sheet of Digital Television channel search method of the present invention, and the method comprises:
S10, Digital Television, when receiving the confirmation instruction of the automatic channel search that user sends, send the request of obtaining network information table NIT information, and from this data card, receive the NIT information of feedback to data card.
When user need to carry out automatic channel search to Digital Television, user can send automatic channel search to this Digital Television and determine instruction, and this Digital Television determines that according to this instruction sends the request of obtaining network information table NIT information to data card.Data card feeds back according to the request of this Digital Television, to return to NIT information to this Digital Television.If do not preserve NIT information in this data card, this data card need to first be set up NIT information, after setting up NIT information, then this NIT information is fed back to Digital Television.
This data card is CICAM card, and this CICAM cartoon is crossed CI interface and is connected with Digital Television, and this CICAM card and Digital Television are carried out data interaction by CI agreement, and this CI agreement is the general-purpose interface agreement that CICAM card is communicated by letter with digital TV data.
S20, this Digital Television, when receiving this NIT information, are resolved the NIT information receiving, to obtain the network information, frequency list information and program list information.
In this step, Digital Television is resolved the NIT information receiving from data card, to obtain the network information, frequency list information and program list information.
This Digital Television is resolved the NIT information receiving from data card, extract link descriptor (link descriptor), and arrangement obtains the network information from this NIT information.This network information comprises primitive network Information ID number (Original Network ID), transport stream No. ID (Transport Stream ID), No. ID, program (Service ID).Wherein link descriptor has clear and definite definition in SI standard, and definition value is 0x4A.
This Digital Television is resolved the NIT information receiving from data card, extract transmission descriptor (delivery descriptor), and arrangement obtains frequency list information from this NIT information.Concrete, according to primitive network Information ID number (Original Network ID) and No. ID, transport stream (Transport Stream ID), obtain the physics frequency point information at transport stream place.Wherein transmit descriptor has clear and definite definition in SI standard, and according to different transmission systems, definition value is different.
This Digital Television is resolved the NIT information receiving from data card, extracts program descriptor (ciplus service descriptor) from this NIT information, and arrangement obtains program list information.Concrete, according to primitive network Information ID number (Original Network ID) and No. ID, transport stream (Transport Stream ID), arrangement obtains the programme information of all programs, this program list information comprises program No. ID (Service ID), programm name (Service Name), program category (Service Type), program optional attribute (Selectable), program visual attribute (Visible), program logic number (LCN).Wherein program descriptor has clear and definite definition in CI standard, and definition value is 0xCC.
When S30, this Digital Television detect signal on the Frequency point of this frequency list information, upgrade pmt table and pat table, to carry out tuning.
In this step, Digital Television is carried out tuning according to frequency list information, and the Frequency point in frequency list information is monitored, and when signal being detected on Frequency point, upgrades pmt table and pat table, to carry out tuning.When user selects corresponding program, can pmt table and pat table from upgrading parse Video ID(video ID) and Audio ID(audio frequency ID), for broadcasting.
Adopt the embodiment of the present invention, Digital Television is directly obtained NIT information from data card, then the NIT information of obtaining is resolved and obtained frequency list information, while signal being detected on the Frequency point of frequency frequency list information, upgrade pmt table and pat table, to carry out tuning; Can improve tuning speed, promote user experience.
With reference to Fig. 2, Fig. 2 is the second embodiment schematic flow sheet of Digital Television channel search method of the present invention.
The first embodiment based on above-mentioned Digital Television channel search method, after step S20, the method comprises:
S40, this Digital Television are mapped this network information, frequency list information and program list information, set up complete program data, and preserve this program data.
Because the NIT information in data card does not substantially change within a period of time, so this Digital Television is without obtaining NIT information to data card frequently.In this step, the network information, frequency list information and program list information that step S20 is obtained from data card acquisition NIT information analysis are mapped and set up complete program data and preserve, Digital Television can directly be carried out next tuning according to the program data of this foundation, can reduce this Digital Television and again obtain NIT information from data card, can improve tuning efficiency.
Concrete, according to primitive network Information ID number (Original Network ID), transport stream No. ID (Transport Stream ID) and No. ID (Service ID) mapping relations of program, this network information, frequency list information and program list information are mapped.
With reference to Fig. 3, Fig. 3 is the 3rd embodiment schematic flow sheet of Digital Television channel search method of the present invention.
The first embodiment based on above-mentioned Digital Television channel search method, before step S10, the method comprises:
The second tuning state information that S50, this Digital TV Receiving data card send, and to user, send the whether inquiry instruction of automatic channel search according to this second tuning state information.
In this step S50, this Digital Television can initiatively receive the second tuning state information that data card sends, this Digital Television can initiatively send the instruction of obtaining the second tuning state information to data card, so that this data card feeds back the second tuning state information to this Digital Television; This Digital Television also can be passive the second tuning state information of sending of reception data card, this data card, when the second tuning state information has renewal, sends to Digital Television by the second tuning state information in time.
Further, this step S50 comprises (as shown in Figure 4):
The second tuning state information that S51, this Digital TV Receiving data card send, and read the first tuning state information of this Digital Television storage.
This second tuning state information comprises tuning instruction version number, the carrier ID number of the current storage of data card, and this first tuning state information comprises tuning instruction version number, the carrier ID number of the current storage of Digital Television.
Whether S52, this Digital Television are analyzed this second tuning state information identical with the first tuning state information, if not identical, perform step S53.
In this step, whether this Digital Television is analyzed this second tuning state information identical with the first tuning state information, as whether the same with the tuning instruction version number in the first tuning state information in the tuning instruction version number analyzing in the second tuning state information, whether the carrier ID of analyzing in the second tuning state information is the same with the carrier ID in the first tuning state information, as long as any one difference, think that the second tuning state information is different from the first tuning state information, illustrate and likely need Digital Television to carry out automatic channel search, channel is upgraded, so that the channel that the channel of Digital Television and data card provide keeps synchronous.
S53, this Digital Television are obtained automatic quick channel search command information from this data card, if do not have the version number of the version number of NIT information in NIT information or this automatic quick channel search command information and the NIT information of the current preservation of this Digital Television inconsistent in this automatic quick channel search command information, this Digital Television is sent the whether inquiry instruction of automatic channel search to user.
This Digital Television is obtained automatic quick channel search command information from this data card, and the automatic quick channel search command information that this is obtained is preserved, and judge whether this automatic quick channel search command information has NIT information, and when this automatic quick channel search command information comprises NIT information, whether the version number that judges the NIT information in this automatic quick channel search command information is consistent with the version number of the NIT information of the current preservation of this Digital Television, while not having the version number of the version number of NIT information in NIT information or this automatic quick channel search command information and the NIT information of the current preservation of this Digital Television inconsistent in this automatic quick channel search command information, this Digital Television is sent the whether inquiry instruction of automatic channel search to user.As, when the version number of the NIT of the current preservation of Digital Television information is Ver.1, and the version number of the NIT information of the automatic quick channel search command information obtaining is the value of Ver.2 or other non-Ver.1, the NIT information that shows data card has renewal, the NIT information that Digital Television is preserved the not NIT Information preservation current with data card is synchronizeed, therefore, this Digital Television is sent the whether inquiry instruction of automatic channel search to user.As, when the version number of the NIT of the current preservation of Digital Television information is Ver.1, and the version number of the NIT information of the automatic quick channel search command information obtaining is also Ver.1, show that the NIT information that Digital Television is preserved has been up-to-date, do not need to upgrade NIT information, therefore, this Digital Television does not need to send the whether inquiry instruction of automatic channel search to user.
With reference to Fig. 5, Fig. 5 is the preferred embodiment structural representation of Digital Television channel searching system of the present invention, and this system comprises Digital Television 10 and data card 20, and this Digital Television 10 comprises transceiver module 11, parsing module 12, search module 13, wherein:
This transceiver module 11, for when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card 20, and from this data card 20, receives the NIT information of feedback;
This parsing module 12, for resolving the NIT information of reception, to obtain the network information, frequency list information and program list information;
This search module 13, when signal being detected on the Frequency point at this frequency list information, upgrades pmt table and pat table, to carry out tuning.
When user need to carry out automatic channel search to Digital Television, user can send automatic channel search to this Digital Television and determine instruction, and the transceiver module 11 of this Digital Television 10 determines that according to this instruction sends the request of obtaining network information table NIT information to data card.Data card 20 feeds back according to the request of this Digital Television, to return to NIT information to this Digital Television.If do not preserve NIT information in this data card 20, this data card need to first be set up NIT information, after setting up NIT information, then this NIT information is fed back to Digital Television.
This data card 20 is CICAM card, and this CICAM cartoon is crossed CI interface and is connected with Digital Television, and this CICAM card and Digital Television are carried out data interaction by CI agreement, and this CI agreement is the general-purpose interface agreement that CICAM card is communicated by letter with digital TV data.
12 pairs of NIT information that receive from data card of parsing module of Digital Television 10 are resolved, to obtain the network information, frequency list information and program list information.Concrete, this parsing module 12 comprises the first resolution unit, the second resolution unit and the 3rd resolution unit, wherein:
This first resolution unit, for the NIT information receiving from data card is resolved, extract link descriptor (link descriptor), and arrangement obtains the network information from this NIT information.This network information comprises primitive network Information ID number (Original Network ID), transport stream No. ID (Transport Stream ID), No. ID, program (Service ID).Wherein link descriptor has clear and definite definition in SI standard, and definition value is 0x4A.
This second resolution unit, for the NIT information receiving from data card is resolved, extract transmission descriptor (delivery descriptor), and arrangement obtains frequency list information from this NIT information.Concrete, according to primitive network Information ID number (Original Network ID) and No. ID, transport stream (Transport Stream ID), obtain the physics frequency point information at transport stream place.Wherein transmit descriptor has clear and definite definition in SI standard, and according to different transmission systems, definition value is different.
The 3rd resolution unit for the NIT information receiving from data card is resolved, is extracted program descriptor (ciplus service descriptor) from this NIT information, and arrangement obtains program list information.Concrete, according to primitive network Information ID number (Original Network ID) and No. ID, transport stream (Transport Stream ID), arrangement obtains the programme information of all programs, this program list information comprises program No. ID (Service ID), programm name (Service Name), program category (Service Type), program optional attribute (Selectable), program visual attribute (Visible), program logic number (LCN).Wherein program descriptor has clear and definite definition in CI standard, and definition value is 0xCC.
This search module 13 carries out tuning according to frequency list information, and the Frequency point in frequency list information is monitored, and when signal being detected on Frequency point, upgrades pmt table and pat table, to carry out tuning.When user selects corresponding program, can pmt table and pat table from upgrading parse Video ID(video ID) and Audio ID(audio frequency ID), for broadcasting.
Further, this Digital Television also comprises to be set up module 14 and preserves module 15, and this is set up module 14 and is connected respectively with this parsing module 12, preservation module 15.
This sets up module 14, for this network information, frequency list information and program list information are mapped, sets up complete program data;
This preserves module 15, for preserving this program data.
This is set up module 14 and parsing module 12 is obtained to the network information, frequency list information and program list information that NIT information analysis obtains from data card is mapped and sets up complete program data, and the program data of this foundation is preserved by preserving module 15; Digital Television can directly be carried out next tuning according to the program data of this foundation, can reduce this Digital Television and again obtain NIT information from data card, can improve tuning efficiency.
Concrete, this sets up module 14 according to primitive network Information ID number (Original Network ID), transport stream No. ID (Transport Stream ID) and No. ID (Service ID) mapping relations of program, and this network information, frequency list information and program list information are mapped.
Further, this transceiver module 11 comprises the first Transmit-Receive Unit, the second tuning state information that this first Transmit-Receive Unit sends for receiving data card, and to user, send the whether inquiry instruction of automatic channel search according to this second tuning state information.
This first Transmit-Receive Unit can initiatively receive the second tuning state information that data card sends, this first Transmit-Receive Unit can initiatively send the instruction of obtaining the second tuning state information to data card, so that this data card feeds back the second tuning state information to this Digital Television; This first Transmit-Receive Unit also can be passive the second tuning state information of sending of reception data card, this data card, when the second tuning state information has renewal, sends to the first Transmit-Receive Unit by the second tuning state information in time.
Further, the second tuning state information that this first Transmit-Receive Unit also sends for receiving data card, and read the first tuning state information of this Digital Television storage; And whether identical with the first tuning state information for analyzing this second tuning state information; And in this second tuning state information with the first tuning state information when not identical, from this data card, obtain automatic quick channel search command information, if do not have the version number of the version number of NIT information in NIT information or this automatic quick channel search command information and the NIT information of the current preservation of this Digital Television inconsistent in this automatic quick channel search command information, this Digital Television is sent the whether inquiry instruction of automatic channel search to user.
This second tuning state information comprises tuning instruction version number, the carrier ID number of the current storage of data card, and this first tuning state information comprises tuning instruction version number, the carrier ID number of the current storage of Digital Television.
Whether this first Transmit-Receive Unit is analyzed this second tuning state information identical with the first tuning state information, as whether the same with the tuning instruction version number in the first tuning state information in the tuning instruction version number analyzing in the second tuning state information, whether the carrier ID of analyzing in the second tuning state information is the same with the carrier ID in the first tuning state information, as long as any one difference, think that the second tuning state information is different from the first tuning state information, illustrate and likely need Digital Television to carry out automatic channel search, channel is upgraded, so that the channel that the channel of Digital Television and data card provide keeps synchronous.
This first Transmit-Receive Unit obtains automatic quick channel search command information from this data card, and the automatic quick channel search command information that this is obtained is preserved, and judge whether this automatic quick channel search command information has NIT information, and when this automatic quick channel search command information comprises NIT information, whether the version number that judges the NIT information in this automatic quick channel search command information is consistent with the version number of the NIT information of the current preservation of this Digital Television, while not having the version number of the version number of NIT information in NIT information or this automatic quick channel search command information and the NIT information of the current preservation of this Digital Television inconsistent in this automatic quick channel search command information, this first Transmit-Receive Unit sends the whether inquiry instruction of automatic channel search to user.As, when the version number of the NIT of the current preservation of Digital Television information is Ver.1, and the version number of the NIT information of the automatic quick channel search command information obtaining is the value of Ver.2 or other non-Ver.1, the NIT information that shows data card has renewal, the NIT information that Digital Television is preserved the not NIT Information preservation current with data card is synchronizeed, therefore, this first Transmit-Receive Unit sends the whether inquiry instruction of automatic channel search to user.As, when the version number of the NIT of the current preservation of Digital Television information is Ver.1, and the version number of the NIT information of the automatic quick channel search command information obtaining is also Ver.1, show that the NIT information that Digital Television is preserved has been up-to-date, do not need to upgrade NIT information, therefore, this first Transmit-Receive Unit does not need to send the whether inquiry instruction of automatic channel search to user.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a Digital Television channel search method, is characterized in that, the method comprises:
Digital Television, when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card, and from described data card, receives the NIT information of feedback;
Described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, to obtain the network information, frequency list information and program list information;
When described Digital Television detects signal on the Frequency point of described frequency list information, upgrade pmt table and pat table, to carry out tuning.
2. method according to claim 1, is characterized in that, described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, and after obtaining the step of the network information, frequency list information and program list information, the method also comprises:
Described Digital Television is mapped the described network information, frequency list information and program list information, sets up complete program data, and preserves described program data.
3. method according to claim 1, is characterized in that, described Digital Television, when receiving described NIT information, is resolved the NIT information receiving, and to obtain the step of the network information, frequency list information and program list information, comprises:
Described Digital Television, when receiving described NIT information, extract link descriptor, and arrangement obtains the network information from described NIT information; And from described NIT information, extract transmission descriptor, and arrangement obtains frequency list information; And extract program descriptor from described NIT information, and arrangement obtains program list information.
4. method according to claim 1, it is characterized in that, described Digital Television is when receiving the confirmation instruction of the automatic channel search that user sends, to data card, send the request of obtaining network information table NIT information, and receive the step of the NIT information of feeding back from described data card before, the method also comprises:
The second tuning state information that described Digital TV Receiving data card sends, and to user, send the whether inquiry instruction of automatic channel search according to described the second tuning state information.
5. method according to claim 4, is characterized in that, the second tuning state information that described Digital TV Receiving data card sends, and the step of sending the whether inquiry instruction of automatic channel search to user according to this second tuning state information comprises:
The second tuning state information that described Digital TV Receiving data card sends, and read the first tuning state information of described Digital Television storage;
Whether described Digital Television is analyzed described the second tuning state information identical with the first tuning state information;
If described the second tuning state information is not identical with the first tuning state information, described Digital Television is obtained automatic quick channel search command information from described data card, if do not have the version number of the version number of NIT information in NIT information or described automatic quick channel search command information and the NIT information of the current preservation of described Digital Television inconsistent in described automatic quick channel search command information, described Digital Television is sent the whether inquiry instruction of automatic channel search to user.
6. a Digital Television channel searching system, is characterized in that, this system comprises Digital Television and data card, and described Digital Television comprises transceiver module, parsing module, search module, wherein:
Described transceiver module, for when receiving the confirmation instruction of the automatic channel search that user sends, sends the request of obtaining network information table NIT information to data card, and from described data card, receives the NIT information of feedback;
Described parsing module, for resolving the NIT information of reception, to obtain the network information, frequency list information and program list information;
Described search module, when signal being detected on the Frequency point at described frequency list information, upgrades pmt table and pat table, to carry out tuning.
7. system according to claim 6, it is characterized in that, described Digital Television also comprises to be set up module and preserves module, and the described module of setting up, for the described network information, frequency list information and program list information are mapped, is set up complete program data; Described preservation module is used for preserving described program data.
8. system according to claim 6, is characterized in that, described parsing module comprises:
The first resolution unit, for extract link descriptor from described NIT information, and arrangement obtains the network information;
The second resolution unit, for extract transmission descriptor from described NIT information, and arrangement obtains frequency list information;
The 3rd resolution unit, for extracting program descriptor from described NIT information, and arrangement obtains program list information.
9. system according to claim 6, it is characterized in that, described transceiver module comprises the first Transmit-Receive Unit, the second tuning state information that described the first Transmit-Receive Unit sends for receiving data card, and to user, send the whether inquiry instruction of automatic channel search according to described the second tuning state information.
10. system according to claim 9, is characterized in that, the second tuning state information that described the first Transmit-Receive Unit also sends for receiving data card, and read the first tuning state information of described Digital Television storage; And whether identical with the first tuning state information for analyzing described the second tuning state information; And in described the second tuning state information with the first tuning state information when not identical, from described data card, obtain automatic quick channel search command information, if do not have the version number of the version number of NIT information in NIT information or described automatic quick channel search command information and the NIT information of the current preservation of described Digital Television inconsistent in described automatic quick channel search command information, to user, send the whether inquiry instruction of automatic channel search.
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| CN104159156A (en) * | 2014-09-03 | 2014-11-19 | 四川金网通电子科技有限公司 | Method for realizing set-top box program update through NIT (Network Information Table) version number |
| CN107360385A (en) * | 2017-07-19 | 2017-11-17 | 深圳市茁壮网络股份有限公司 | The searching method and system of a kind of channel |
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