CN102111666B - Method for searching channels and digital television integrated machine using same - Google Patents
Method for searching channels and digital television integrated machine using same Download PDFInfo
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Abstract
The invention is applied in the technical field of digital televisions, and provides a method for searching channels and a digital television integrated machine using the same. The method comprises the following steps of: a, searching television signals corresponding to a central frequency point in a central frequency point list one by one till a network information table (NIT) is acquired from the searched television signals; and b, extracting frequency list descriptors from the NIT, and positioning the frequency information carried by the frequency list descriptors to the frequency points with signals. According to the technical scheme provided by the invention, quick search can be performed aiming at the central frequency point to acquire the NIT, the frequency list descriptors are extracted from the NIT, and the frequency information carried by the frequency list descriptors is quickly positioned to the frequency points with signals so as to finish quickly searching the channels.
Description
Technical field
The invention belongs to the digital television techniques field, relate in particular to a kind of method of tuning and adopt the digital TV integrated machine of the method.
Background technology
Digital television manufacturer is at present in the process of exploitation digital TV integrated machine, a product that tends to develop can be sold to each city, the whole nation, and be difficult to the definition of the operator in all cities, the whole nation is all included in the development phase of product, and various places operator is in from sending analog signal to the translate phase that sends digital signal in several years of future, and system upgrade frequently brings PSI (Program SpecificInformation programme information)/SI (Service Information information on services) and channel fix is uncertain.This situation has caused orienting towards the whole country the analogue digital integrated television in market in quick channel search, the rendition list very large difficulty of function existence such as renewals automatically, because product is sold to different cities, different regions, complete information on services that these functions will obtain deposit Frequency point and form is all had any different.
The station search mode of existing Digital Television comprises two large classes: full range point tuning with utilize NIT (NetworkInformation Table network information table) quick channel search.The former way is similar to simulated television, progressively scan from the low frequency to the high frequency according to variation and the current state of decoder related data of the line of frequently buckling, this process generally can surpass 20 minutes, and owing to can't utilizing NIT table, the function that does not have program automatically to upgrade; And the latter first finds NIT and extract Frequency List Descriptor (list of frequency descriptor) from NIT, utilize the list of frequency descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search, but this mode is difficult to be applicable to digital TV integrated machine, because the digital TV integrated machine in the market that orients towards the whole country can't be determined the Frequency point at NIT place.
Therefore, be necessary to provide a kind of technical scheme, can realize the tuning of the simple and fast of digital TV integrated machine.
Summary of the invention
The object of the present invention is to provide the digital TV integrated machine of method and employing the method for a kind of tuning, be intended to solve the problem of digital TV integrated machine quick channel search.
The present invention is achieved in that a kind of method of searching channels of all-in-one digital television, and described method comprises:
A, TV signal corresponding to center frequency point in the list of search center frequency one by one are until obtain NIT from the TV signal that searches;
B, extract the list of frequency descriptor from described NIT, according to described list of frequency descriptor with frequency information navigate to the Frequency point that each has signal.
More specifically, wherein also comprise before step a:
A0, build the center frequency point list according to the center frequency point of the frequency range that in the standard channel table, each channel is corresponding, described center frequency point list is preset in described digital television all-in-one.
More specifically, wherein step a specifically comprises:
A1, begun by center frequency point corresponding to Mid Frequency, search for one by one TV signal corresponding to center frequency point in described center frequency point list according to order from low to high, if obtained NIT from the TV signal that searches, turn step b, otherwise turn step a2;
A2, from the lowest center frequency, according to from low to high order TV signal corresponding to center frequency point in the list of search center frequency one by one, until obtain NIT from the TV signal that searches, turn step b.
More specifically, wherein step b also comprises:
Store the center frequency point of carrying described NIT into described digital TV integrated machine as the dominant frequency point.
More specifically, wherein also comprise after step b:
C, next time during tuning, are searched for TV signal corresponding to described dominant frequency point again, obtain NIT from the TV signal that searches.
The present invention also provides a kind of digital TV integrated machine, and described digital TV integrated machine comprises tuning and demultiplexing module, decoder module, MCU and memory; Wherein:
Described tuning and demultiplexing unit are used for TV signal corresponding to search center frequency, described TV signal is carried out the demodulation demultiplexing process backward described decoding unit output TS stream;
Described decoding unit is used for described TS stream is resolved, and parses SI from described TS stream, and the SI that parses is transferred to described MCU;
The center frequency point that described MCU is used for calling one by one from described memory in the center frequency point list is input to described tuning and demultiplexing module, and is used for obtaining NIT from the SI of described decoding unit transmission, extracts the list of frequency descriptor from described NIT;
Described memory is used for storing described center frequency point list.
More specifically, described MCU begins with center frequency point corresponding to cause Mid Frequency, and the center frequency point of calling from described memory one by one in the center frequency point list according to order from low to high is input to described tuning and demultiplexing module.
More specifically, the described MCU center frequency point that also is used for carrying NIT stores in described memory as the dominant frequency point.
More specifically, described MCU also is used for calling described dominant frequency point from described memory, and described dominant frequency point is input to described tuning and demultiplexing module, describedly tuningly also is used for searching for TV signal corresponding to described dominant frequency point with demultiplexing module.
More specifically, described MCU also be used for according to described list of frequency descriptor with frequency information navigate to the Frequency point that each has signal.
Technical scheme provided by the invention designs a center frequency point list in advance according to the center frequency point of the corresponding frequency range of each channel in the standard channel table, and this center frequency point list comprises the center frequency point of each channel institute respective frequencies scope.Digital TV integrated machine is when tuning first, at first search for one by one according to the center frequency point in the center frequency point list, search NIT, extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search.Technical scheme provided by the invention can be carried out fast search for center frequency point, obtain NIT, extract the list of frequency descriptor from NIT, utilize the list of frequency descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search.
Description of drawings
Fig. 1 is embodiment of the present invention digital TV integrated machine schematic diagram;
Fig. 2 is embodiment of the present invention flow chart.
Embodiment
Technical scheme provided by the invention is: the center frequency point according to the corresponding frequency range of each channel in the standard channel table, design in advance a center frequency point list, and this center frequency point list comprises the center frequency point of each channel institute respective frequencies scope.Digital TV integrated machine is when tuning first, at first search for one by one according to the center frequency point in the center frequency point list, search NIT, extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search.In addition, can also will carry the center frequency point of NIT as the storage of dominant frequency point, as the dominant frequency point of next quick channel search.
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
According to the experience that actual field is surveyed, the frequency that carries NIT in the digital television signal in the most areas of China all is in the center frequency point place of the frequency range of each channel that defines in the standard channel list.Therefore, can at first according to the center frequency point of the corresponding frequency range of each channel in the standard channel table, design a center frequency point list.For example in the standard channel table, the frequency range of certain channel " DS-26 " definition is 614Mhz to 622Mhz, its center frequency point is 618Mhz, the frequency range that certain channel " DS-20 " is corresponding for another example is 526Mhz to 534Mhz, its center frequency point is 530Mhz, ..., the rest may be inferred, and the center frequency point of the frequency range that all channels are corresponding is listed in the center frequency point list according to order from low to high, forms the center frequency point list.
Digital TV integrated machine during tuning, need to obtain NIT first, therefore needs search to carry the frequency of NIT.As mentioned above, the frequency overwhelming majority of carrying NIT all is in the center frequency point place of the frequency range of each channel that defines in the standard channel list, therefore, TV signal corresponding to center frequency point in the list of search center frequency one by one, until obtain NIT from the TV signal that searches, then extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search.Meanwhile, can also store the center frequency point of carrying NIT into digital TV integrated machine as the dominant frequency point, as the dominant frequency point of next quick channel search.
In addition, according to the experience that actual field is surveyed, carry the center frequency point of NIT table generally all in the medium-high frequency section.Therefore, one by one during TV signal corresponding to the center frequency point in the list of search center frequency, can be from center frequency point corresponding to Mid Frequency, according to from low to high the order center frequency point in the list of search center frequency one by one, if after the highest center frequency point, still do not search NIT, search for one by one according to order from low to high from the lowest center frequency, until search NIT.
During specific implementation technical scheme provided by the invention, a data field can be set in the memory of digital TV integrated machine, it is called N, this data field N is used for the center frequency point that the NIT table is carried in storage, as the dominant frequency point of quick channel search.The initial value of this data field is 0, and expression does not store the dominant frequency point.
when digital TV integrated machine is carried out quick channel search, at first the value of data query field N, if its value is 0, show it is tuning first, do not store the dominant frequency point in this data field N, TV signal corresponding to center frequency point in the list of search center frequency one by one, until obtain NIT from the TV signal that searches, extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search, and the center frequency point that will carry NIT stores in this data field N as the dominant frequency point, dominant frequency point as next quick channel search, if stored the dominant frequency point in data field N, directly search this dominant frequency point, obtain NIT from TV signal corresponding to this dominant frequency point, extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal, thereby complete quick channel search.
During the specific implementation technical solution of the present invention, can design a NIT quick channel search menu option, the user chooses this NIT quick channel search menu option by the functions of television set menu, starts NIT quick channel search flow process.
Embodiment of the present invention flow chart specifically comprises following step as shown in Figure 1:
1, the center frequency point of the frequency range that in the standard channel list, each channel is corresponding is listed in the center frequency point list according to order from low to high, the center frequency point list is preset to the digital television all-in-one;
2, digital TV integrated machine starts NIT quick channel search flow process;
3, store the dominant frequency point of NIT quick channel search in the check dight TV integrated machine? if no, turn step 4, otherwise turn step 10;
4, from center frequency point corresponding to Mid Frequency, according to from low to high order TV signal corresponding to center frequency point in the list of search center frequency one by one, resolve NIT from the TV signal of correspondence;
5, do you parse NIT? if no, turn step 6, otherwise turn step 8;
6, from the lowest center frequency, according to from low to high order TV signal corresponding to center frequency point in the list of search center frequency one by one, resolve NIT from the TV signal of correspondence;
7, do you parse NIT? if have, turn step 8, otherwise process ends;
8, extract Frequency List Descriptor from NIT, utilize Frequency List Descriptor with frequency information, navigate to fast the Frequency point that each has signal;
9, the center frequency point that will carry NIT stores in the digital TV integrated machine memory as the dominant frequency point;
10, TV signal corresponding to direct search dominant frequency point, parse NIT from the TV signal of correspondence? if no, process ends, otherwise turn step 8.
The schematic diagram of the digital TV integrated machine that the embodiment of the present invention provides comprises control signal receiver module, decoder module, MCU (microprocessor), memory and tuning and demultiplexing module as shown in Figure 2, wherein:
The control signal receiver module is connected with MCU, is used for receiving the control command that starts the NIT quick channel search;
MCU is connected with demultiplexing module with tuning, is used for the control command that starts the NIT quick channel search is resolved, according to the operation of analysis result control system; As: the center frequency point of calling from memory one by one in the center frequency point list is input to tuning and demultiplexing module, controls tuningly to search for TV signal corresponding to each center frequency point with demultiplexing module; Controlling decoding unit receives the TS (Transport Stream transport stream) of tuning and demultiplexing unit transmission and it is resolved; The SI (ServiceInformation information on services) of receipt decoding unit transmission obtains NIT from SI; The center frequency point that carries NIT is stored in memory etc. as the dominant frequency point;
Tuningly be connected with decoding unit with demultiplexing unit, be used for searching for TV signal corresponding to each center frequency point, TV signal is carried out the demodulation demultiplexing process backward decoding unit output TS stream;
Decoding unit is connected with MCU, is used for tuning TS stream with the demultiplexing unit transmission is resolved, and parses SI from TS stream, and the SI that parses is transferred to MCU;
Memory is connected with MCU, is used for the list of storage center frequency, and is used for the center frequency point that carries NIT is stored as dominant frequency point.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the method for a searching channels of all-in-one digital television, described method comprises:
A0, build the center frequency point list according to the center frequency point of the frequency range that in the standard channel table, each channel is corresponding, described center frequency point list is preset in described digital television all-in-one;
A, TV signal corresponding to center frequency point in the list of search center frequency one by one are until obtain NIT from the TV signal that searches;
B, extract the list of frequency descriptor from described NIT, according to described list of frequency descriptor with frequency information navigate to the Frequency point that each has signal.
2. method according to claim 1, is characterized in that, wherein step a specifically comprises:
A1, begun by center frequency point corresponding to Mid Frequency, search for one by one TV signal corresponding to center frequency point in described center frequency point list according to order from low to high, if obtained NIT from the TV signal that searches, turn step b, otherwise turn step a2;
A2, from the lowest center frequency, according to from low to high order TV signal corresponding to center frequency point in the list of search center frequency one by one, until obtain NIT from the TV signal that searches, turn step b.
3. method according to claim 1, is characterized in that, wherein step b also comprises:
Store the center frequency point of carrying described NIT into described digital TV integrated machine as the dominant frequency point.
4. method according to claim 3, is characterized in that, wherein also comprises after step b:
C, next time during tuning, are searched for TV signal corresponding to described dominant frequency point again, obtain NIT from the TV signal that searches.
5. a digital TV integrated machine, is characterized in that, described digital TV integrated machine comprises tuning and demultiplexing module, decoder module, MCU and memory; Wherein:
Described tuning and demultiplexing module are used for TV signal corresponding to search center frequency, described TV signal is carried out the demodulation demultiplexing process backward described decoder module output TS stream;
Described decoder module is used for described TS stream is resolved, and parses SI from described TS stream, and the SI that parses is transferred to described MCU;
The center frequency point that described MCU is used for calling one by one from described memory in the center frequency point list is input to described tuning and demultiplexing module, and is used for obtaining NIT from the SI of described decoder module transmission, extracts the list of frequency descriptor from described NIT;
Described memory is used for storing described center frequency point list.
6. digital TV integrated machine according to claim 5, it is characterized in that, described MCU begins with center frequency point corresponding to cause Mid Frequency, and the center frequency point of calling from described memory one by one in the center frequency point list according to order from low to high is input to described tuning and demultiplexing module.
7. digital TV integrated machine according to claim 5, is characterized in that, the center frequency point that described MCU also is used for carrying NIT stores in described memory as the dominant frequency point.
8. digital TV integrated machine according to claim 7, it is characterized in that, described MCU also is used for calling described dominant frequency point from described memory, described dominant frequency point is input to described tuning and demultiplexing module, describedly tuningly also is used for searching for TV signal corresponding to described dominant frequency point with demultiplexing module.
9. digital TV integrated machine according to claim 5, is characterized in that, described MCU also be used for according to described list of frequency descriptor with frequency information navigate to the Frequency point that each has signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102025940A (en) * | 2010-12-22 | 2011-04-20 | 深圳Tcl新技术有限公司 | Method for searching channel of digital television |
| CN103647983B (en) * | 2013-12-30 | 2018-04-27 | 深圳Tcl新技术有限公司 | A kind of DTV channel search method and system |
| CN104202665A (en) * | 2014-09-03 | 2014-12-10 | 四川金网通电子科技有限公司 | Method for automatically modifying central frequency point of set top box |
| CN106658166B (en) * | 2016-12-13 | 2020-09-01 | 广州视源电子科技股份有限公司 | Television program channel searching method, switching method and system |
| CN108989719B (en) * | 2018-06-29 | 2021-06-25 | 广州视源电子科技股份有限公司 | Channel searching method and system, readable storage medium and smart television |
| CN115243099B (en) * | 2022-06-24 | 2024-06-04 | 深圳创维－Rgb电子有限公司 | Frequency point channel searching method and device, electronic equipment and readable storage medium |
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