CN102256071B - Method and device for searching channels in mobile analog television - Google Patents
Method and device for searching channels in mobile analog television Download PDFInfo
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- CN102256071B CN102256071B CN2010101815321A CN201010181532A CN102256071B CN 102256071 B CN102256071 B CN 102256071B CN 2010101815321 A CN2010101815321 A CN 2010101815321A CN 201010181532 A CN201010181532 A CN 201010181532A CN 102256071 B CN102256071 B CN 102256071B
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Abstract
The invention discloses a method and device for searching channels in a mobile analog television, wherein the method comprises the steps of: A. selecting a frequency point from a plurality of preset frequency points according to a predetermined rule; B. receiving a composite video broadcast signal (CVBS) on the frequency point, respectively detecting the minimum value of the CVBS in each row time period, and recording the position of the minimum value of the CVBS; C. judging whether the situation in which the position difference between the minimum value of the CVBS in every two adjacent row time periods conforms to a predetermined requirement within N continuous row time periods exists, if so, determining that the frequency point is effective, storing the frequency point or a channel number corresponding to the frequency point, and performing a step D; if not, determining that the frequency point is ineffective, and performing the step D; and D. judging whether the selection of all the frequency points is finished, if so, ending up the flow, or, selecting a next frequency point according to the predetermined rule, and repeatedly performing the step B. By employing the scheme of the invention, the cumulative time for searching for the channels can be shortened, and the user experience is enhanced.
Description
Technical field
The present invention relates to move the simulated television technology, channel search method and device in particularly a kind of mobile simulated television.
Background technology
Existing moving in the simulated television technology searched the platform mode and is generally a plurality of frequencies are set in advance, then on each frequency; Detect the state of Video Decoder respectively; When its state meets the requirements, think that then this frequency is effective frequency, preserve the corresponding channel of this frequency or this frequency.
But; Can there be certain problem in this mode in practical application, because: Video Decoder is positioned at the rear end of whole mobile simulated television system, the composite video broadcast singal (CVBS that transmitting station etc. are launched; Composite Video Broadcast Signal) is transferred to Video Decoder and needs the regular hour (front end will carry out a series of processing to signal); Whether and Video Decoder oneself also will carry out certain processing to the received signal, could detect the state of Video Decoder then, effective to confirm frequency; It is longer to cause searching the platform time like this; Especially to a plurality of frequencies, searching the platform cumulative time can be very long, thereby influences user experience.
Summary of the invention
In view of this, main purpose of the present invention is the channel search method in a kind of mobile simulated television is provided, and can shorten and search the platform cumulative time, promotes user experience.
Another object of the present invention is to provide the table apparatus of searching in a kind of mobile simulated television, can shorten and search the platform cumulative time, promote user experience.
For achieving the above object, technical scheme of the present invention is achieved in that
Channel search method in a kind of mobile simulated television comprises:
A, from a plurality of frequencies that are provided with in advance, choose a frequency by pre-defined rule;
B, on this frequency, receive composite video broadcasting CVBS, and detect the minimum value of CVBS in the cycle respectively, note the position of the minimum value of CVBS simultaneously at each line time;
C, judge whether to exist a N continuous line time in the cycle, the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring, and said N is the positive integer greater than 2; If, confirm that then this frequency is effective, preserve the corresponding channel of this frequency or this frequency; Execution in step D then; Otherwise, confirm that this frequency is invalid, directly execution in step D;
D, judge whether that all frequencies have all been chosen and finish, if, process ends then, otherwise, choose next frequency by pre-defined rule, and repeated execution of steps B;
Wherein, said position difference meets predetermined the requirement and comprises: the absolute value of position difference is less than pre-set threshold.
Search table apparatus in a kind of mobile simulated television, comprising:
First selected cell be used for choosing a frequency from a plurality of frequencies that are provided with in advance by pre-defined rule, and notice is given detecting unit, is confirmed the unit and second selected cell;
Said detecting unit; Be used on this frequency, receiving composite video broadcast singal CVBS; And detect the minimum value of CVBS in the cycle respectively at each line time, note the position of the minimum value of CVBS simultaneously, and give said definite unit the position informing of the minimum value of the CVBS that notes;
Said definite unit is used to judge whether to exist a N continuous line time in the cycle, and the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring; Said N is the positive integer greater than 2, if confirm that then this frequency is effective; Preserve the corresponding channel of this frequency or this frequency, notify second selected cell to carry out self function then, otherwise; Confirm that this frequency is invalid, directly notify second selected cell to carry out self function;
Said second selected cell is used to judge in advance whether all frequencies that are provided with have all been chosen finish, if, end process then, otherwise, next frequency chosen by pre-defined rule, and notice is given said detecting unit and definite unit;
Wherein, said position difference meets predetermined the requirement and comprises: the absolute value of position difference is less than pre-set threshold.
Thus it is clear that, adopt technical scheme of the present invention, to each frequency; The position of the minimum value of each CVBS of line time in the cycle among the CVBS that receives through analysis respectively; Confirm whether this frequency is effective, and need not to detect the state of Video Decoder, thereby having saved front end handles used time and used time of Video Decoder itself to CVBS as prior art; And then shortened and searched the platform cumulative time, promoted user experience.
Description of drawings
Fig. 1 is the flow chart of channel search method embodiment of the present invention.
Fig. 2 is the recording mode sketch map of free-run counter according to the invention.
Fig. 3 is the sketch map of state machine according to the invention.
Fig. 4 searches the composition structural representation of table apparatus embodiment for the present invention.
Embodiment
To the problem that exists in the prior art, a kind of new platform scheme of searching is proposed among the present invention, when guaranteeing to search the platform accuracy, can shorten and search the platform cumulative time, promote user experience.
For make technical scheme of the present invention clearer, understand, below with reference to the accompanying drawing embodiment that develops simultaneously, scheme according to the invention is done to specify further.
Fig. 1 is the flow chart of channel search method embodiment of the present invention.As shown in Figure 1, may further comprise the steps:
Step 11: from a plurality of frequencies that are provided with in advance, choose a frequency by pre-defined rule.
It is prior art that which frequency specifically is set, and repeats no more.
In addition, in the present embodiment, the said concrete implementation of choosing frequency by pre-defined rule is not limit, such as, can choose successively by the frequency order from low to high of each frequency.
Step 12: on this frequency, receive CVBS, and detect the minimum value of CVBS in the cycle respectively, note the position of the minimum value of CVBS simultaneously at each line time.
In this step, after receiving CVBS, can utilize low pass filter that it is carried out LPF earlier, with the high-frequency information among the filtering CVBS, like noise and color sub-carrier signal etc., so that the follow-up minimum value that detects the CVBS in each line time cycle better.Wherein, the bandwidth of low pass filter can be decided according to the actual requirements.
Afterwards; To the CVBS behind the LPF; In each line time cycle (generally including 1728 sampled points, the 27Mhz sampling clock), detect the minimum value of CVBS respectively, and note the position of the minimum value of CVBS; In practical application, a position that the free-run counter writes down the minimum value of CVBS capable of using.Fig. 2 is the recording mode sketch map of free-run counter according to the invention.As shown in Figure 2, the count value of free-run counter can be from 0～L, and the value of L can be decided according to the actual requirements; Such as 1728, arrive each time after the L, promptly return 0 automatically; Restart counting; In the present embodiment, the corresponding count value of minimum value of record CVBS is with the position of this count value as the minimum value of CVBS.
In practical application, can promptly detect the minimum value of CVBS in the cycle respectively from first line time cycle at each line time; Perhaps, also can abandon before M line time cycle, treat signal stabilization after; Since M+1 line time cycle; Detect the minimum value of CVBS in cycle respectively at each line time, M is a positive integer, and concrete value can be decided according to the actual requirements.
Step 13: judge whether to exist a N continuous line time in the cycle, the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring, if; Confirm that then this frequency is effective, execution in step 14, otherwise; Confirm that this frequency is invalid, execution in step 15.
In this step, if a N continuous line time in the cycle, the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined requirement, like the absolute value of position difference less than pre-set threshold, that is:
| Pos [n]-Pos [n-1] |＜THRESHOLD_LOCK, n=2to N thinks that then current frequency is effective.
Wherein, the position of the minimum value of the CVBS of Pos [n] in a certain line time cycle of expression, the concrete value of threshold value THRESHOLD_LOCK and N all can be decided according to the actual requirements.In theory, as long as N is for greater than 2 positive integer, but reality, and it is accurate more that its value is wantonly searched for the platform result more, and value is less, and it is short more to search the used time of platform.
Step 14: preserve the corresponding channel of this frequency or this frequency, execution in step 15 then.
This step specifically be embodied as prior art, repeat no more.
Step 15: judging whether that all frequencies have all been chosen finishes, if, process ends then, otherwise, repeated execution of steps 11.
If all frequencies all dispose by said process, process ends then, otherwise, choose next frequency, repeat said process.
So far, promptly accomplished introduction about method embodiment shown in Figure 1.
In practical application, an available state machine is realized above-mentioned processing procedure to each frequency.Fig. 3 is the sketch map of state machine according to the invention.As shown in Figure 3, comprising:
1) idle (Idle) state after powering on, gets the hang of 2);
2) seek initial minimum value (FIND_INTI_MIN) state, under this state, through enable signal; The control correlation unit starts, and in the CVBS that receives, detects initial minimum value, i.e. the minimum value of CVBS in first line time cycle; And write down its position, get the hang of 3 afterwards);
In theory, first line time in the cycle minimum value of detected CVBS be initial minimum value, but in practical application; The M that can delay time earlier is capable; The concrete value of M can be decided according to the actual requirements, then, treat signal stabilization after; Detect initial minimum value again, promptly do not carry out the detection of the minimum value of CVBS in the cycle at preceding M line time;
3) seek row (FIND_SYNCTIP) state synchronously, promptly judge whether to satisfy | Pos [n]-Pos [n-1] |＜THRESHOLD_LOCK, this condition of n=2to N (promptly satisfying sync lock condition) is if then get the hang of 4), otherwise, keep this state always;
4) wait for (standby) state, for certain frequency, if at the appointed time interior this state that gets into of state machine thinks that then this frequency is effective.
Based on above-mentioned introduction, Fig. 4 searches the composition structural representation of table apparatus embodiment for the present invention.As shown in Figure 4, comprising:
First selected cell 41 be used for choosing a frequency from a plurality of frequencies that are provided with in advance by pre-defined rule, and notice is given detecting unit 42, is confirmed the unit 43 and second selected cell 44;
Detecting unit 42 is used on this frequency, receiving CVBS, and detects the minimum value of CVBS in the cycle respectively at each line time, notes the position of the minimum value of CVBS simultaneously, and the position informing of the minimum value of the CVBS that notes is given confirm unit 43;
Confirm unit 43, be used to judge whether to exist a N continuous line time in the cycle that the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring; N is the positive integer greater than 2, if confirm that then this frequency is effective; Preserve the corresponding channel of this frequency or this frequency, notify second selected cell 44 to carry out self function then, otherwise; Confirm that this frequency is invalid, directly notify second selected cell 44 to carry out self function;
Second selected cell 44 is used to judge in advance whether all frequencies that are provided with have all been chosen finish, if, end process then, otherwise, next frequency chosen by pre-defined rule, and notice is given detecting unit 42 and definite unit 43.
Wherein, said position difference meets predetermined the requirement and comprises: the absolute value of position difference is less than pre-set threshold.
Detecting unit 42 can be further used for, and the CVBS that receives is carried out LPF, and/or, since M+1 line time cycle, detecting the minimum value of CVBS in the cycle respectively at each line time, M is a positive integer.
The concrete workflow of device embodiment shown in Figure 4 repeats no more please with reference to the respective description among the method embodiment shown in Figure 1 here.
In a word, adopt technical scheme of the present invention, can shorten and search the platform cumulative time, promote user experience.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (7)
1. the channel search method in the mobile simulated television is characterized in that this method comprises:
A, from a plurality of frequencies that are provided with in advance, choose a frequency by pre-defined rule;
B, on this frequency, receive composite video broadcast singal CVBS, and detect the minimum value of CVBS in the cycle respectively, note the position of the minimum value of CVBS simultaneously at each line time;
C, judge whether to exist a N continuous line time in the cycle, the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring, and said N is the positive integer greater than 2; If, confirm that then this frequency is effective, preserve the corresponding channel of this frequency or this frequency; Execution in step D then; Otherwise, confirm that this frequency is invalid, directly execution in step D;
D, judge whether that all frequencies have all been chosen and finish, if, process ends then, otherwise, choose next frequency by pre-defined rule, and repeated execution of steps B;
Wherein, said position difference meets predetermined the requirement and comprises: the absolute value of position difference is less than pre-set threshold.
2. method according to claim 1 is characterized in that, the position of the minimum value of the said CVBS of noting comprises:
Utilize the position of the minimum value of CVBS under the free-run counter records.
3. method according to claim 1 is characterized in that, and is said before each line time detects the minimum value of CVBS respectively in the cycle, further comprises:
CVBS to receiving carries out LPF.
4. method according to claim 1 is characterized in that, the said minimum value that detects CVBS in the cycle respectively at each line time comprises:
Since M+1 line time cycle, detect the minimum value of CVBS in the cycle respectively at each line time, said M is a positive integer.
5. search table apparatus in the mobile simulated television, it is characterized in that, comprising:
First selected cell be used for choosing a frequency from a plurality of frequencies that are provided with in advance by pre-defined rule, and notice is given detecting unit, is confirmed the unit and second selected cell;
Said detecting unit; Be used on this frequency, receiving composite video broadcast singal CVBS; And detect the minimum value of CVBS in the cycle respectively at each line time, note the position of the minimum value of CVBS simultaneously, and give said definite unit the position informing of the minimum value of the CVBS that notes;
Said definite unit is used to judge whether to exist a N continuous line time in the cycle, and the position difference of the minimum value of the CVBS in per two adjacent lines time cycles all meets predetermined situation about requiring; Said N is the positive integer greater than 2, if confirm that then this frequency is effective; Preserve the corresponding channel of this frequency or this frequency, notify second selected cell to carry out self function then, otherwise; Confirm that this frequency is invalid, directly notify second selected cell to carry out self function;
Said second selected cell is used to judge in advance whether all frequencies that are provided with have all been chosen finish, if, end process then, otherwise, next frequency chosen by pre-defined rule, and notice is given said detecting unit and definite unit;
Wherein, said position difference meets predetermined the requirement and comprises: the absolute value of position difference is less than pre-set threshold.
6. device according to claim 5 is characterized in that said detecting unit is further used for, and the CVBS that receives is carried out LPF.
7. device according to claim 5 is characterized in that said detecting unit is further used for, and since M+1 line time cycle, detects the minimum value of CVBS in the cycle respectively at each line time, and said M is a positive integer.
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| CN2010101815321A CN102256071B (en) | 2010-05-19 | 2010-05-19 | Method and device for searching channels in mobile analog television |
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| CN2010101815321A CN102256071B (en) | 2010-05-19 | 2010-05-19 | Method and device for searching channels in mobile analog television |
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| CN102256071A CN102256071A (en) | 2011-11-23 |
| CN102256071B true CN102256071B (en) | 2012-11-21 |
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| CN2010101815321A Active CN102256071B (en) | 2010-05-19 | 2010-05-19 | Method and device for searching channels in mobile analog television |
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| CN103763054B (en) * | 2013-12-12 | 2018-07-10 | 延锋伟世通电子科技（上海）有限公司 | The reception of vehicle-mounted radio medium wave stops platform control method |
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| CN1937736A (en) * | 2006-06-30 | 2007-03-28 | 康佳集团股份有限公司 | Television channel-searching control method and control device using same |
| CN101299806A (en) * | 2008-06-06 | 2008-11-05 | 深圳创维－Rgb电子有限公司 | Television as well as control method for searching TV channel |
| CN101399946A (en) * | 2007-09-26 | 2009-04-01 | 深圳Tcl新技术有限公司 | Channel searching method for television and television set thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007006360A (en) * | 2005-06-27 | 2007-01-11 | Funai Electric Co Ltd | Television receiver |
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| CN1615005A (en) * | 2003-11-04 | 2005-05-11 | 台达电子工业股份有限公司 | Tv-set channel searching method |
| CN1925572A (en) * | 2005-09-02 | 2007-03-07 | 乐金电子（沈阳）有限公司 | Automatic channel searching device and method |
| CN1937736A (en) * | 2006-06-30 | 2007-03-28 | 康佳集团股份有限公司 | Television channel-searching control method and control device using same |
| CN101399946A (en) * | 2007-09-26 | 2009-04-01 | 深圳Tcl新技术有限公司 | Channel searching method for television and television set thereof |
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Non-Patent Citations (1)
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Address after: 100084, No. 803, building A, Tsinghua Science and Technology Park, No. 8, Zhongguancun East Road, building 1, Haidian District, Beijing Patentee after: Chong Yi Technology Group Ltd. Address before: 100084, No. 803, building A, Tsinghua Science and Technology Park, No. 8, Zhongguancun East Road, building 1, Haidian District, Beijing Patentee before: INNOFIDEI TECHNOLOGIES Inc. |
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Effective date of registration: 20201109 Address after: 215500 No.13, Caotang Road, Changshu, Suzhou, Jiangsu Province Patentee after: Changshu intellectual property operation center Co.,Ltd. Address before: 100084, No. 803, building A, Tsinghua Science and Technology Park, No. 8, Zhongguancun East Road, building 1, Haidian District, Beijing Patentee before: Chong Yi Technology Group Ltd. |
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Address after: 215500 5th floor, building 4, 68 Lianfeng Road, Changfu street, Changshu City, Suzhou City, Jiangsu Province Patentee after: Changshu intellectual property operation center Co.,Ltd. Address before: No.13 caodang Road, Changshu City, Suzhou City, Jiangsu Province Patentee before: Changshu intellectual property operation center Co.,Ltd. |