CN101616111B - Demodulation parameter searching method and electronic device applying same - Google Patents
Demodulation parameter searching method and electronic device applying same Download PDFInfo
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- CN101616111B CN101616111B CN2008101293108A CN200810129310A CN101616111B CN 101616111 B CN101616111 B CN 101616111B CN 2008101293108 A CN2008101293108 A CN 2008101293108A CN 200810129310 A CN200810129310 A CN 200810129310A CN 101616111 B CN101616111 B CN 101616111B
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Abstract
The invention relates to a demodulation parameter searching method which is applied to an electronic device for receiving a channel signal and used for finding out a demodulation parameter being suitable for demodulating a data stream contained in the channel signal from a demodulation parameter assembly containing a plurality of demodulation parameters of the channel signal. The searching method comprises the following steps: providing a channel parameter list which records weighted values of the demodulation parameters in advance; selecting an unused demodulation parameter with a highest weighted value in the demodulation parameter assembly to demodulate the data stream of the channel signal according to the channel parameter list; if the data stream can be smoothly demodulated, weighting the demodulation parameter, and otherwise, judging whether the demodulation parameters are all used or not; and if the data stream cannot be smoothly demodulated, repeating the steps. The method improves the speed for finding out the appropriate demodulation parameter.
Description
Technical field
The present invention relates to a kind of demodulation parameter searching method, particularly a kind of demodulation parameter searching method of Digital Television.
Background technology
Now on the two-forty digital communication technologies such as Digital Television, digital broadcasting and radio area network widely the employing wireless transmission manner transmit data, numerous data such as data flow and parameter have been comprised in the signal of these wireless transmission, must pass through suitable demodulation process the recipient, just can from data flow, take out needed numerical data, Digital Television for example, demodulator wherein can be play content of TV program after must demodulating the data flow in the received channel signals and deliver to the rear end and carrying out the data flow decoding.
Existing generally have a transmission parameter signaling (Transmission Parameter Signaling, TPS) ground system of digital television broadcast, receiving terminal (for example digital TV set-top box) can carry out demodulation with the demodulation parameter of appointing and fix to the data flow in the channel signals with transmitting terminal.Yet; for the television broadcasting system of this no transmission parameter signaling data of China Digital TV terrestrial broadcast system; except comprising data flow, still need in the channel signals that its transmitting terminal sends and comprise multiple demodulation parameter combination (protection (Guard Interval at interval for example; GI); Modulation etc.; comprise a plurality of demodulation parameters in each demodulation parameter combination); and be sent to the receiver of Digital Television together; and receiver is if will demodulate programme content; then need from these several demodulation parameter combinations, to find out a suitable demodulation parameter respectively; and data stream carried out demodulation, could decode programme content again the data flow after demodulation.Therefore, in order to find out these demodulation parameters, consulting Fig. 1, is a kind of method of searching the demodulation parameter of Digital Television in the prior art, is example with the demodulation parameter of seeking among the GI, and it carries out following steps after receiving channel signals:
Then, repeat above-mentioned steps again, then look for the demodulation parameter in other demodulation parameter combination, after treating that demodulation parameter in the combination of whole demodulation parameters is all found, can carry out demodulation to this data flow smoothly, and the data flow decoding circuit of delivering to the rear end carries out the decoding of programme content and finishes the channel parameter seek mode.
But way so makes when user's switching channels, and receiving terminal all must re-execute above-mentioned step and search demodulation parameter in the various demodulation parameters combinations, so that receiving terminal can't improve the speed of searching demodulation parameter.
Summary of the invention
Therefore, purpose of the present invention promptly is to provide a kind of and can reduces the demodulation parameter searching method of searching the demodulation parameter time.So, demodulation parameter searching method of the present invention is the electronic installation that is applied to the receiving channels signal, in order to from the demodulation parameter combination that comprises a plurality of demodulation parameters of this channel signals, find out the demodulation parameter that is suitable for the data flow in this channel signals of demodulation, this method for searching comprises:
(a) set up the channel parameter tabulation, wherein record the weighted value of described demodulation parameter;
(b), select the demodulation parameter that weighted value in this demodulation parameter combination is the highest and be not used according to the tabulation of this channel parameter;
(c) adopt this selecteed demodulation parameter that the data flow of this channel signals is carried out demodulation, if this data flow of demodulation smoothly, then to the weighted value weighting of this selecteed demodulation parameter, otherwise execution in step (d); And
(d) judge whether all demodulation parameters all were used, if not, repeating step (b) reaches (c).
The weighted value of demodulation parameter can be a preset value in the channel parameter tabulation of the present invention, or after each execution in step (c), the number of times that adds up that is weighted.In addition, the weighted value of demodulation parameter sorts from high to low in the channel parameter tabulation.
According to a further aspect in the invention, provide a kind of electronic installation, receiving channels signal, described channel signals comprise demodulation parameter combination and the data flow with a plurality of demodulation parameters, it is characterized in that:
Described electronic installation comprises:
Control module stores the weighted value corresponding with described demodulation parameter, and receives described demodulation parameter, and the selection weighted value is the highest and demodulation parameter that be not used is exported; And
Demodulator, be coupled to described control module, and receive the data flow of described channel signals and the demodulation parameter that described control module is exported, described demodulator carries out demodulation according to described selecteed demodulation parameter to described data flow, if the described data flow of demodulation smoothly, then described control module is to the weighted value weighting of the demodulation parameter exported, otherwise described control module can extract the highest and demodulation parameter that be not used of another weighted value and carry out demodulation for described demodulator.
Beneficial effect of the present invention is: preferentially extract the higher demodulation parameter of weighted value and carry out demodulation, can improve the probability that just can demodulate programme content for the first time, reduce the number of times of demodulation failure, to reduce the time of searching demodulation parameter.
Description of drawings
Fig. 1 is a flow chart, and the demodulation method for searching of prior art is described.
Fig. 2 is a circuit block diagram, and the relation of the element in the electronic installation in the preferred embodiments of the present invention is described.
Fig. 3 is a database, and comprises GI and the tabulation of Modulation channel parameter, and demodulation parameter and corresponding weighted value thereof among demodulation parameter combination GI and the Modulation are described.
Fig. 4 is a flow chart, and demodulation parameter searching method of the present invention is described.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, with reference in the graphic DETAILED DESCRIPTION OF THE PREFERRED, can clearly present in following cooperation.
Consult Fig. 2, it is the preferred embodiment of demodulation parameter searching method of the present invention, this method for searching is to be applied on the electronic installation 1 of two-forty digital communication, and the electronic installation 1 of present embodiment is built in digital TV set-top box (the Set Top Box of Digital Television in being, STB), it mainly is to utilize Wireless transmission mode to receive the digital television program signal (following general designation channel signals) that TV station sends.At no transmission parameter signaling (Transmission Parameter Signaling; TPS) in the television broadcasting system; each channel signals that transmitting terminal (TV station) is sent can comprise data flow (wherein comprising the digital television program content) and the combination of multiple demodulation parameter; wherein the demodulation parameter combination has protection (Guard Interval at interval; GI); Modulation etc.; and have a plurality of demodulation parameters in each demodulation parameter combination; therefore; no matter digital TV set-top box is external or built-in; it must be from received channel signals; in each demodulation parameter combination, extract a suitable demodulation parameter respectively, could carry out demodulation data stream.
In the present embodiment, digital TV set-top box except existing in order to corresponding channel selecting signal, outside the associated processing circuit of the channel signals of the correspondence that selection is received (figure does not show), also comprise in order to search demodulation parameter, the data flow in this channel signals is carried out the control module 2 and the demodulator 3 of demodulation process.Control module 2 can be taken out multiple demodulation parameter combination from channel signals, and sends demodulation parameter to demodulator 3 from each demodulation parameter combination.Demodulator 3 then is coupled to control module 2, and accept the demodulation parameter that data flow and control module sent out in the channel signals, after data stream being carried out demodulation according to these demodulation parameters, deliver to the decoding unit 4 of rear end again, so that solve programme content and output the data flow after demodulation.
And in order to make control module 2 can find suitable demodulation parameter apace, the control module 2 of present embodiment includes database 21, this database 21 is in the memory (figure does not show) that is stored in the control module 2, it comprises the GI parameter list and the Modulation parameter list of the weighted value of a plurality of demodulation parameters that are used for writing down respectively each demodulation parameter combination, as shown in Figure 3, wherein, record five demodulation parameter 420CPN in the GI parameter list, 945VPN, 595CPN, 945CPN and 420VPN, and its default weighted value is respectively 5,3,2,1 and 0, and also record five demodulation parameter 64QAM in the Modulation parameter list, 16QAM, 32QAM, 4QAM and 4QAM-NR, and its weighted value is preset as 5 respectively, 3,2,1 and 0.
The method for searching of demodulation parameter of the present invention flow process as shown in Figure 4.After electronic installation 1 receives a channel signals (when just the user selects some channels), can enter the channel parameter seek mode and carry out following steps (illustrating) to search the GI demodulation parameter:
In step 43, control module 2 judges whether that all demodulation parameters all were used, if the demodulation parameter that is not used in addition, then repeated execution of steps 41 and step 42, that is to say, suppose that demodulation parameter 420CPN that step 41 proposes can't demodulated data stream, then again during repeating step 41, the demodulation parameter 945VPN with second high weight will be suggested (because demodulation parameter 420CPN was used) and carry out step 42; Otherwise, repeating through after the step 41,42,, just representing to there is no data flow in the selected channel of user if all demodulation parameters all were used and all can't demodulated data stream in the GI parameter list, then control module 2 can stop seek actions, and promptly the user will can not see programme content.
Similarly, for another group demodulation parameter combinations Modulation in the channel signals, also can according to above-mentioned step hunt out one can demodulated data stream demodulation parameter, and when all find suitable demodulation parameter from each demodulation parameter combination after, then demodulator 21 promptly can utilize these demodulation parameters to the data flow demodulation.
Because electronic installation 1 is through using for a long time, during each user's switching channels, electronic installation 1 all can utilize above-mentioned method for searching to seek suitable demodulation parameter, therefore, the weighted value of demodulation parameter commonly used will constantly be increased, just Chang Yong demodulation parameter can preferentially be proposed to carry out demodulation to demodulator 3 always, improved in the probability that just can find correct demodulation parameter for the first time, and further reduced the number of times of demodulation mistake, make the time of searching demodulation parameter significantly to reduce.
In addition, what deserves to be mentioned is, the weighted value of the demodulation parameter in the above-mentioned database 21 can be the predefined preset value of program designer (it is promptly default promptly to dispatch from the factory), also can search the weighted value that ten channel signals (perhaps more multichannel) back is set up out through above-mentioned search flow process.Certainly, the method of setting up the weighted value of the demodulation parameter in the database 21 can also be that electronic installation 1 is when being unlocked for the first time, just earlier to all channel scannings one time, find out the demodulation parameter of each channel signals correspondence, make the weighted value that before channel is selected, can set up out demodulation parameter in the database 21.In addition, electronic installation 1 also comprises reset button (figure does not show), the user can be optionally by pushing replacement trigger control module 2, make control module 2 that the weighted value of the demodulation parameter in all demodulation parameter combinations in the database 21 is reset to zero, perhaps set up on their own after after a while by control module 2, the weighted value with the demodulation parameter in all demodulation parameters combinations in the database 21 resets to zero automatically.
In sum, demodulation parameter searching method of the present invention is the notion by weighted value, after finding demodulation parameter each time with its weights weighting, and the demodulation parameter that the higher weightings value preferentially will be arranged extracts to demodulator and carries out demodulation, improved the probability that just can demodulate programme content for the first time, reduced the number of times of demodulation mistake, made method for searching of the present invention compared to prior art, its search time can will significantly reduce.
Claims (9)
1. demodulation parameter searching method, be applied to the electronic installation of receiving channels signal, in order to from the demodulation parameter combination that comprises a plurality of demodulation parameters of described channel signals, find out the demodulation parameter that is suitable for the data flow in the described channel signals of demodulation, it is characterized in that:
Described demodulation parameter searching method comprises following steps:
(a) set up the channel parameter tabulation, in this tabulation, record the weighted value of described demodulation parameter;
(b), select the demodulation parameter that weighted value in the described demodulation parameter combination is the highest and be not used according to the tabulation of described channel parameter;
(c) adopt described selecteed demodulation parameter that the data flow of described channel signals is carried out demodulation, if the described data flow of demodulation smoothly, then to the weighted value weighting of described selecteed demodulation parameter, and after weighting process ends, otherwise execution in step (d); And
(d) judge whether all demodulation parameters all were used, if not, then repeating step (b) reaches (c).
2. demodulation parameter searching method as claimed in claim 1 is characterized in that: the weighted value of demodulation parameter can be preset value described in the described channel parameter tabulation.
3. demodulation parameter searching method as claimed in claim 1 is characterized in that: after the weighted value of each demodulation parameter is execution in step (c) in the described channel parameter tabulation, and the number of times that adds up that is weighted.
4. as claim 2 or 3 described demodulation parameter searching methods, it is characterized in that: the weighted value of demodulation parameter sorts from high to low described in the described channel parameter tabulation.
5. electronic installation, receiving channels signal, described channel signals comprise demodulation parameter combination and the data flow with a plurality of demodulation parameters, it is characterized in that:
Described electronic installation comprises:
Control module stores the weighted value corresponding with described demodulation parameter, and receives described demodulation parameter, and the selection weighted value is the highest and demodulation parameter that be not used is exported; And
Demodulator, be coupled to described control module, and receive the data flow of described channel signals and the demodulation parameter that described control module is exported, described demodulator carries out demodulation according to described selecteed demodulation parameter to described data flow, if the described data flow of demodulation smoothly, then described control module is to the weighted value weighting of the demodulation parameter exported, otherwise described control module can extract the highest and demodulation parameter that be not used of another weighted value and carry out demodulation for described demodulator.
6. electronic installation as claimed in claim 5 is characterized in that: described control module also comprises memory, is used for storing the weighted value of described each demodulation parameter of demodulation parameter combination.
7. electronic installation as claimed in claim 5 is characterized in that: described electronic installation also comprises reset button, is triggered by described reset button, and described control module can reset to the weighted value of all demodulation parameters zero.
8. electronic installation as claimed in claim 5 is characterized in that: described electronic installation also comprises the decoding unit that is coupled to described demodulator, is used for the data flow after the demodulation is decoded and exported programme content.
9. electronic installation as claimed in claim 7 is characterized in that: described electronic installation be digital TV set-top box and built-in set-top box Digital Television one of them.
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| CN2008101293108A CN101616111B (en) | 2008-06-26 | 2008-06-26 | Demodulation parameter searching method and electronic device applying same |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429452A (en) * | 2000-04-14 | 2003-07-09 | 日本电信电话株式会社 | Method, system and apparatus for acquiring information concerning broadcast information |
| TW200631420A (en) * | 2005-02-24 | 2006-09-01 | Matsushita Electric Tw Co Ltd | Fast and automatic channel-scanning method |
| CN1969553A (en) * | 2004-08-13 | 2007-05-23 | 微软公司 | Systems for unifying heterogeneous multimedia tuners |
| CN101146211A (en) * | 2006-09-11 | 2008-03-19 | 思华科技（上海）有限公司 | Load balance system and method of VoD network |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429452A (en) * | 2000-04-14 | 2003-07-09 | 日本电信电话株式会社 | Method, system and apparatus for acquiring information concerning broadcast information |
| CN1969553A (en) * | 2004-08-13 | 2007-05-23 | 微软公司 | Systems for unifying heterogeneous multimedia tuners |
| TW200631420A (en) * | 2005-02-24 | 2006-09-01 | Matsushita Electric Tw Co Ltd | Fast and automatic channel-scanning method |
| CN101146211A (en) * | 2006-09-11 | 2008-03-19 | 思华科技（上海）有限公司 | Load balance system and method of VoD network |
Non-Patent Citations (1)
| Title |
|---|
| 陆志宏等.数字电视机顶盒工作原理与关键技术.《中国有线电视》.2006,(第09/10期), * |
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