CN102256071A - 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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- CN102256071A CN102256071A CN2010101815321A CN201010181532A CN102256071A CN 102256071 A CN102256071 A CN 102256071A CN 2010101815321 A CN2010101815321 A CN 2010101815321A CN 201010181532 A CN201010181532 A CN 201010181532A CN 102256071 A CN102256071 A CN 102256071A
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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 mobile simulated television technology, channel search method and device in particularly a kind of mobile simulated television.
Background technology
In the existing mobile simulated television technology, search the platform mode and be generally and set in advance a plurality of frequencies, 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, preserves the channel of this frequency or this frequency correspondence.
But, can there be certain problem in this mode in actual applications, because: Video Decoder is positioned at the rear end of whole mobile simulated television system, composite video broadcast singal (the 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), and Video Decoder oneself also will carry out certain processing to the received signal, could detect the state of Video Decoder then, whether effective to determine frequency, it is longer to cause searching the platform time like this, especially at 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 to provide the channel search method in a kind of mobile simulated television, 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 set 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 the situation of pre-provisioning request, described N is the positive integer greater than 2, if determine that then this frequency is effective, preserves the channel of this frequency or this frequency correspondence, execution in step D then, otherwise, determine 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.
Search table apparatus in a kind of mobile simulated television, comprising:
First selected cell is used for choosing a frequency from a plurality of frequencies that set in advance by pre-defined rule, and is notified to detecting unit, determining unit and second selected cell;
Described 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 described determining unit the position informing of the minimum value of the CVBS that notes;
Described determining unit, be used to 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 the situation of pre-provisioning request, and described N is the positive integer greater than 2, if, determine that then this frequency is effective, preserve the channel of this frequency or this frequency correspondence, notify second selected cell to carry out self function then, otherwise, determine that this frequency is invalid, directly notify second selected cell to carry out self function;
Described second selected cell is used to judge whether all frequencies that set in advance have all been chosen finishes, if, end process then, otherwise, choose next frequency by pre-defined rule, and be notified to described detecting unit and determining unit.
As seen, adopt technical scheme of the present invention, at each frequency, the position of the minimum value of each CVBS of line time in the cycle among the CVBS that receives by analysis respectively, determine 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 schematic diagram of free-run counter of the present invention.
Fig. 3 is the schematic diagram of state machine of the present invention.
Fig. 4 searches the composition structural representation of table apparatus embodiment for the present invention.
Embodiment
At problems of 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 of the present invention is described in further detail.
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 set in advance, choose a frequency by pre-defined rule.
It is prior art which frequency specifically is set, and repeats no more.
In addition, in the present embodiment, the described specific 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 low-pass filtering earlier, with the high-frequency information among the filtering CVBS, as 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, at the CVBS after the low-pass filtering, (generally include 1728 sampled points in each line time cycle, the 27Mhz sampling clock) detects the minimum value of CVBS in respectively, and note the position of the minimum value of CVBS, in actual applications, can utilize a free-run counter to write down the position of the minimum value of CVBS.Fig. 2 is the recording mode schematic diagram of free-run counter of the present invention.As shown in Figure 2, the count value of free-run counter can be from 0～L, 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 count value of the minimum value correspondence of record CVBS is with the position of this count value as the minimum value of CVBS.
In actual applications, can be from first line time cycle, promptly detect the minimum value of CVBS in the cycle respectively 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 the situation of pre-provisioning request, if, determine that then this frequency is effective, execution in step 14, otherwise, determine 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 pre-provisioning request, as 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, Pos[n] the position of minimum value of CVBS 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 channel of this frequency or this frequency correspondence, execution in step 15 then.
The specific implementation of this step is a prior art, repeats 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 finished introduction about method embodiment shown in Figure 1.
In actual applications, an available state machine is realized above-mentioned processing procedure at each frequency.Fig. 3 is the schematic diagram of state machine of the present 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, pass through enable signal, the control correlation unit starts, and detects initial minimum value in the CVBS that receives, 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 actual applications, 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), if, then get the hang of 4), otherwise, this state kept always;
4) wait for (standby) state,,, think that then this frequency is effective if state machine enters this state at the appointed time for certain frequency.
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 is used for choosing a frequency from a plurality of frequencies that set in advance by pre-defined rule, and is notified to detecting unit 42, determining unit 43 and second selected cell 44;
Detecting unit 42 is used for receiving CVBS on this frequency, 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 gives determining unit 43 with the position informing of the minimum value of the CVBS that notes;
Determining unit 43, be used to 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 the situation of pre-provisioning request, and N is the positive integer greater than 2, if, determine that then this frequency is effective, preserve the channel of this frequency or this frequency correspondence, notify second selected cell 44 to carry out self function then, otherwise, determine that this frequency is invalid, directly notify second selected cell 44 to carry out self function;
Second selected cell 44 is used to judge whether all frequencies that set in advance have all been chosen finishes, if, end process then, otherwise, choose next frequency by pre-defined rule, and be notified to detecting unit 42 and determining unit 43.
Wherein, described position difference meets pre-provisioning request 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 low-pass filtering, 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 please refer to the respective description among the method embodiment shown in Figure 1, repeats no more herein.
In a word, adopt technical scheme of the present invention, can shorten and search the platform cumulative time, promote user experience.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the channel search method in the mobile simulated television is characterized in that this method comprises:
A, from a plurality of frequencies that set 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 the situation of pre-provisioning request, described N is the positive integer greater than 2, if determine that then this frequency is effective, preserves the channel of this frequency or this frequency correspondence, execution in step D then, otherwise, determine 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.
2. method according to claim 1 is characterized in that, described position difference meets pre-provisioning request and comprises: the absolute value of position difference is less than pre-set threshold.
3. method according to claim 1 and 2 is characterized in that, the position of the minimum value of the described CVBS of noting comprises:
Utilize the position of the minimum value of CVBS under the free-run counter records.
4. method according to claim 1 and 2 is characterized in that, and is described before each line time detects the minimum value of CVBS respectively in the cycle, further comprises:
The CVBS that receives is carried out low-pass filtering.
5. method according to claim 1 and 2 is characterized in that, the described 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, described M is a positive integer.
6. search table apparatus in the mobile simulated television, it is characterized in that, comprising:
First selected cell is used for choosing a frequency from a plurality of frequencies that set in advance by pre-defined rule, and is notified to detecting unit, determining unit and second selected cell;
Described 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 described determining unit the position informing of the minimum value of the CVBS that notes;
Described determining unit, be used to 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 the situation of pre-provisioning request, and described N is the positive integer greater than 2, if, determine that then this frequency is effective, preserve the channel of this frequency or this frequency correspondence, notify second selected cell to carry out self function then, otherwise, determine that this frequency is invalid, directly notify second selected cell to carry out self function;
Described second selected cell is used to judge whether all frequencies that set in advance have all been chosen finishes, if, end process then, otherwise, choose next frequency by pre-defined rule, and be notified to described detecting unit and determining unit.
7. device according to claim 6 is characterized in that, described position difference meets pre-provisioning request and comprises: the absolute value of position difference is less than pre-set threshold.
8. according to claim 6 or 7 described devices, it is characterized in that described detecting unit is further used for, the CVBS that receives is carried out low-pass filtering.
9. according to claim 6 or 7 described devices, it is characterized in that described detecting unit is further used for, since M+1 line time cycle, detect the minimum value of CVBS in the cycle respectively at each line time, described M is a positive integer.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN102256071B CN102256071B (en) | 2012-11-21 |
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Cited By (1)
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| CN102256071B (en) | 2012-11-21 |
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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. |