CN101282487B - Method and apparatus for detecting signal as well as method and apparatus for recovering digital television signal - Google Patents
Method and apparatus for detecting signal as well as method and apparatus for recovering digital television signal Download PDFInfo
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Abstract
The invention provides a method and device for signal detection, as well as a method and device for digital TV signal restoration. The signal detection method is used for detecting color-pulse signalin the digital TV signal, including: receiving scan line signal in the digital TV signal; obtaining and saving a first level jump character of the line scan signal according to the preset cycle; comparing the first level jump character with a second level jump character, confirming the color-pulse signal is detected when the comparing result shows that the first level jump character fits the second level jump character which is a level jump character of the standard color-pulse signal. The invention can detect the color-pulse signal in digital TV signals, thereby realizing restoration of digital TV signals.
Description
Technical field
The present invention relates to the digital television techniques field, particularly a kind of signal detection method, device and digital television signal restoration methods, device, ColorBurst (look pulse) signal in the detecting digital television signal, and utilize the look pulse signal that detects to carry out digital television signal and recover.
Background technology
In present television system, (Sequentiel Couleur AMemoire annotates: three kinds of standards French) for more common have NTSC (National Television SystemCommittee), PAL (Phase Alteration Line) and SECAM.TSC-system is called grace system again, and Phase Alternation Line system is called account again, and you make, and all belongs to system simultaneously; Sequential Color and Memory system are called SEQUAM system again, belong to sequential system simultaneously.
In the emission process of digital television signal, also launch a kind of ColorBurst signal in the time of the emission picture signal.In NTSC and these two kinds of standards of PAL, each bar scan line all is to begin with a line synchronizing signal, occurs the ColorBurst signal subsequently.
In digital television application, digital television signal need carry out long-distance transmissions, can be subjected to extraneous various interference inevitably, and distortion, distortion, problem such as unintelligible can appear in the digital television signal after being disturbed, and has a strong impact on spectators' visual experience.In order to make the reset condition that returns to that digital television signal after being interfered can be correct, just need proofread and correct it.Need adopt a benchmark digital television signal being carried out timing, this benchmark can adopt line synchronizing signal and ColorBurst signal.
Yet, use the amplitude information of ColorBurst signal to be used as the benchmark that digital television signal recovers, just need this ColorBurst signal of detecting, yet, the inventor is in realizing process of the present invention, find also not detect in the prior art technical scheme of ColorBurst signal, also utilize the amplitude information of ColorBurst signal to recover digital television signal with regard to being far from being.
Summary of the invention
The purpose of this invention is to provide a kind of signal detection method, device and digital television signal restoration methods, device, realize the detecting of the look pulse signal in the digital television signal.
To achieve these goals, the embodiment of the invention provides a kind of signal detection method, is used for detecting the look pulse signal of digital television signal, comprising:
Scan line signal in the receiving digital television signal;
Obtain and preserve the first level saltus step feature of line scan signals by predetermined period;
The more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal.
Above-mentioned method, wherein, described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
Above-mentioned method wherein, also comprises:
Obtain the amplitude of described look pulse signal according to the described first level saltus step feature of preserving.
To achieve these goals, the embodiment of the invention also provides a kind of digital television signal restoration methods, comprising:
Scan line signal in the receiving digital television signal;
Obtain and preserve the first level saltus step feature of line scan signals by predetermined period;
The more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
Obtain the amplitude of described look pulse signal according to the described first level saltus step feature of preserving;
Recover described digital television signal according to the amplitude of described look pulse signal.
Above-mentioned method, wherein, described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.To achieve these goals, the embodiment of the invention also provides a kind of signal sensing device, is used for detecting the look pulse signal of digital television signal, comprising:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal.
Above-mentioned device, wherein, described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
Above-mentioned device wherein, is characterized in that, also comprises:
The amplitude acquisition module is used for obtaining according to the described first level saltus step feature of preserving the amplitude of described look pulse signal.
To achieve these goals, the embodiment of the invention also provides a kind of digital television signal recovery device, comprising:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
The amplitude acquisition module is used for obtaining according to the described first level saltus step feature of preserving the amplitude of described look pulse signal;
Recover module, be used for recovering described digital television signal according to the amplitude of described look pulse signal.
Above-mentioned device, wherein, described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
The embodiment of the invention is by extracting the level saltus step feature of line scan signals, and when level saltus step feature conforms to the level saltus step feature of standard C olorBurst signal, judge and detect the ColorBurst signal, utilize the square law device of the embodiment of the invention, can be simply and correctly detect the ColorBurst signal, and realize recovery to digital television signal based on the ColorBurst signal that detects.
Description of drawings
Fig. 1 is the complete scan row waveform signal schematic diagram of standard NTSC;
Fig. 2 is the schematic diagram of the ColorBurst signal in the actual TV signal;
Fig. 3 is the schematic flow sheet of the method for the embodiment of the invention;
Fig. 4 is the structural representation of the ColorBurst signal sensing device of the embodiment of the invention.
Embodiment
The signal detection method of the embodiment of the invention, device and digital television signal restoration methods, device, amplitude saltus step information according to digital television signal is detected the ColorBurst signal, and the ColorBurst signal that utilizes this detecting to obtain recovers digital television signal as benchmark.
The complete scan row waveform signal of a standard NTSC as shown in Figure 1, wherein:
IRE unit is the international TV level unit of account that international radio engineers association formulates, and is the zero reference level of TV signal with blanking level (Blank Level);
The brightest level of white level (White Level) expression television image;
The darkest level of black level (Black Level) expression television image.
The part of being surrounded for the dotted line circle among Fig. 1 is the ColorBurst signal level.
Fig. 2 is the schematic diagram of the ColorBurst signal in the actual TV signal, as can be seen from Figure 2, the ColorBurst signal that is surrounded for the dotted line circle occurs followed by Blank Level, and still be BlankLevel subsequently, simultaneously, this ColorBurst signal is the center with Blank Level, circulation change.
As shown in Figure 3, the signal detection method of the embodiment of the invention is used for detecting the ColorBurst signal of digital television signal, comprising:
Certainly, can further obtain the amplitude of ColorBurst signal after detecting the ColorBurst signal, that is, the signal detection method of the embodiment of the invention also comprises:
Pre-conditioned describe method of the present invention in detail below in conjunction with the schematic diagram of standard C olorBurst signal shown in Figure 2 with different first.
As shown in Figure 2, in the change procedure of ColorBurst signal, the number of times that jumps to 20IRE from-20IRE is 9 times, and hopping amplitude is 40IRE, simultaneously, except the saltus step first time and last saltus step, the starting point of other saltus step is not 20IRE, be exactly-20IRE, and amplitude is about 40IRE.
Therefore, according to above-mentioned feature, this level saltus step feature comprises following type:
1, the level value of the starting point of level saltus step and end point for standard C olorBurst signal, is respectively-20IRE and 20IRE;
2, the level value of the starting point of level saltus step and hopping amplitude for standard C olorBurst signal, are respectively-20IRE and 40IRE;
3, the level value of the starting point of level saltus step and continuously transition times for standard C olorBurst signal, are respectively-20IRE and 9 times;
4, the level value of the end point of level saltus step and hopping amplitude for standard C olorBurst signal, are respectively 20IRE and 40IRE;
5, the level value of the end point of level saltus step and continuously transition times for standard C olorBurst signal, are respectively 20IRE and 9 times;
6, the hopping amplitude of level saltus step and transition times for standard C olorBurst signal, are respectively 40IRE and 9 times;
7, the level value of the starting point of level saltus step and end point, transition times for standard C olorBurst signal, are respectively-20IRE, 20IRE and 9 times.
Respectively above-mentioned situation is elaborated below.
The starting point of＜level saltus step and the level value of end point 〉
According to above-mentioned description, can realize detecting according to the starting point of level saltus step and the level value of end point, when following condition is set up, judge the first level saltus step feature and the second level saltus step characteristic matching:
The level of the saltus step starting point of the level saltus step that actual detected arrives is-20IRE ± A IRE (at this, A can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
Actual detected to the level of saltus step end point of level saltus step be 20IRE ± B IRE (at this, B can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary).
Illustrate as follows.
After receiving the scan line signal in the digital television signal, the level that periodically detects line scan signals changes, in the incipient stage, owing to be in Blank Level and line synchronizing signal, when Blank Level jumps to line synchronizing signal, though comprise saltus step, and the level of saltus step starting point and end point does not all satisfy condition, continue to detect the level variation of line scan signals this moment, during to the ColorBurst signal, can detect successively:
Signal jumps to approximately-20IRE from about 0IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
……
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to about 0IRE from about 20IRE.
Can find this moment, except that saltus step for the first time and last saltus step, the starting point that has a repeatedly saltus step is near-20IRE, and the end point of corresponding saltus step is near 20IRE, promptly there is the level saltus step, the level saltus step characteristic matching of its level saltus step feature and standard C olorBurst signal can be judged to detect the ColorBurst signal this moment.
After detecting this ColorBurst signal, can calculate the amplitude of ColorBurst signal according to the level saltus step feature (being the level changing value of starting point and end point) according to the line scan signals of preserving of preserving, as the amplitude of the level saltus step that satisfies condition that will detect for the first time amplitude as the ColorBurst signal, can certainly be with the mean value of the amplitude of the level saltus step that repeatedly satisfies condition actual margin as the ColorBurst signal.
The level value of the starting point of＜level saltus step and hopping amplitude 〉
According to above-mentioned description, can realize detecting according to the level value and the hopping amplitude of the starting point of level saltus step, when following condition is set up, judge the first level saltus step feature and the second level saltus step characteristic matching:
The level of the saltus step starting point of the level saltus step that actual detected arrives is-20IRE ± A IRE (at this, A can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
The level of saltus step starting point is 40IRE ± B IRE (at this, B can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary) for the hopping amplitude of the level saltus step of-20IRE ± A IRE.
Illustrate as follows.
After receiving the scan line signal in the digital television signal, the level that periodically detects line scan signals changes, in the incipient stage, owing to be in Blank Level and line synchronizing signal, when Blank Level jumps to line synchronizing signal, though comprise saltus step, and hopping amplitude meets the demands, because its saltus step starting point is 0IRE, therefore do not match, continue to detect the level variation of line scan signals this moment, during to the ColorBurst signal, can detect successively:
Signal jumps to approximately-20IRE from about 0IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
……
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to about 0IRE from about 20IRE.
Can find this moment, except that saltus step for the first time and last saltus step, the starting point that has a repeatedly saltus step is near-20IRE, and the hopping amplitude of corresponding level saltus step is approximately 40IRE, promptly there is the level saltus step, the level saltus step characteristic matching of its level saltus step feature and standard C olorBurst signal can be judged to detect the ColorBurst signal this moment.
After detecting this ColorBurst signal, can obtain the amplitude of ColorBurst signal according to the level changing value of preserving according to the starting point of the level saltus step of the line scan signals of preserving and saltus step, as the level changing value of the level saltus step that satisfies condition that will detect for the first time amplitude as the ColorBurst signal, can certainly be with the mean value of the level changing value of the level saltus step that repeatedly satisfies condition actual margin as the ColorBurst signal.
The level value of the starting point of＜level saltus step and continuous transition times 〉
According to above-mentioned description, can according to the level value of the starting point of level saltus step and continuously transition times realize detecting, when following condition is set up, judge the first level saltus step feature and the second level saltus step characteristic matching:
The level of the saltus step starting point of the level saltus step that actual detected arrives is-20IRE ± A IRE (at this, A can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
The level of the saltus step starting point that actual detected arrives for the number of times of the level saltus step of-20IRE ± AIRE greater than preset number, as greater than 3 times, 4 inferior.
Illustrate as follows.
After receiving the scan line signal in the digital television signal, the level that periodically detects line scan signals changes, in the incipient stage, owing to be in Blank Level and line synchronizing signal, when Blank Level jumps to line synchronizing signal, though comprise saltus step, and the starting point level of saltus step and transition times etc. all do not meet the demands, continue to detect the level variation of line scan signals this moment, during to the ColorBurst signal, can detect successively:
Signal jumps to approximately-20IRE from about 0IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
……
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to about 0IRE from about 20IRE.
Can find this moment, there be of the level saltus step of starting point level for-20IRE ± A IRE, and with-20IRE ± A IRE is that the level transition times of starting point is 9 times, promptly there is the level saltus step, the level saltus step characteristic matching of its level saltus step feature and standard C olorBurst signal can be judged to detect the ColorBurst signal this moment.
After detecting this ColorBurst signal, can obtain the amplitude of ColorBurst signal according to the hopping amplitude of preserving according to the starting point of the level saltus step of the line scan signals of preserving and saltus step, be the hopping amplitude of the level saltus step of-20IRE ± A IRE amplitude as the starting point level that will detect for the first time as the ColorBurst signal, can certainly be with the mean value of the hopping amplitude of level saltus step repeatedly actual margin as the ColorBurst signal.
The level value of the end point of＜level saltus step and hopping amplitude 〉
Detecting the level value of ColorBurst signal and starting point by the level saltus step and hopping amplitude with the level value of the end point of level saltus step and hopping amplitude, to detect the ColorBurst signal basic identical, its difference only is that the level value of the end point of level saltus step is 20IRE ± B IRE, no longer is repeated in this description at this.
The level value of the end point of＜level saltus step and continuous transition times 〉
With the level value of the end point of level saltus step and continuously transition times detect ColorBurst signal and the level value of starting point by the level saltus step and continuously transition times to detect the ColorBurst signal basic identical, its difference only is that the level value of the end point of level saltus step is 20IRE ± B IRE, no longer is repeated in this description at this.
The hopping amplitude of＜level saltus step and transition times 〉
According to above-mentioned description, can realize detecting according to the hopping amplitude and the transition times of level saltus step, when following condition is set up, judge the first level saltus step feature and the second level saltus step characteristic matching:
Actual detected to the hopping amplitude of level saltus step be 40IRE ± C IRE (at this, C can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
Actual detected to hopping amplitude be that the number of times of level saltus step of 40IRE ± C IRE is greater than preset number, as greater than 3 times, 4 inferior.
Illustrate as follows.
After receiving the scan line signal in the digital television signal, the level that periodically detects line scan signals changes, in the incipient stage, owing to be in Blank Level and line synchronizing signal, when Blank Level jumps to line synchronizing signal, though comprise saltus step, but hopping amplitude and transition times etc. all do not meet the demands, continue to detect the level variation of line scan signals this moment, during to the ColorBurst signal, can detect successively:
Signal jumps to approximately-20IRE from about 0IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
……
Signal jumps to approximately-20IRE from about 20IRE;
Signal from approximately-20IRE jumps to about 20IRE;
Signal jumps to about 0IRE from about 20IRE.
Can find this moment, having hopping amplitude is the level saltus step of 40IRE ± C IRE, and hopping amplitude is that the number of times of the level saltus step of 40IRE ± C IRE is 9 times, promptly there is the level saltus step, the level saltus step characteristic matching of its level saltus step feature and standard C olorBurst signal can be judged to detect the ColorBurst signal this moment.
After detecting this ColorBurst signal, can obtain the amplitude of ColorBurst signal according to the hopping amplitude of preserving according to the starting point of the level saltus step of the line scan signals of preserving and saltus step, as level hopping amplitude that will wherein once detect amplitude as the ColorBurst signal, can certainly be with the mean value of level hopping amplitude repeatedly actual margin as the ColorBurst signal.
The starting point of＜level saltus step and the level value of end point, transition times 〉
According to above-mentioned description, can realize detecting according to the starting point of level saltus step and level value, the transition times of end point, when following condition is set up, judge the first level saltus step feature and the second level saltus step characteristic matching:
The level of the saltus step starting point of the level saltus step that actual detected arrives is-20IRE ± A IRE (at this, A can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
Actual detected to the level of saltus step end point of level saltus step be 20IRE ± B IRE (at this, B can limit as the case may be, then can be provided with greatly a little as the network state difference, then can be provided with smaller on the contrary);
The starting point level that actual detected arrives is-20IRE ± A IRE, and the level of end point is that the number of times of level saltus step of 20IRE ± B IRE is greater than preset times, as 3 times, 4 inferior.
Realize detecting with realize the mode of detecting according to the level value of the starting point of level saltus step and end point according to level value, the transition times of the starting point of level saltus step and end point and compare, only be that Rule of judgment has further added the restriction of transition times, is not described in detail at this.
Certainly, in above-mentioned implementation, all be to be the explanation that example is carried out, but can certainly realize detecting with downward level saltus step with the level saltus step that makes progress, its difference only is the difference of starting point level, end point level and transition times, does not repeat them here.
Certainly, in above-mentioned description, the parameter of level saltus step feature is at least 2, and certainly, this comment saltus step feature also can be 1, or more than 3, but concrete processing procedure ten thousand springs are identical, do not repeat them here.
The signal sensing device of the embodiment of the invention is used for detecting the ColorBurst signal of digital television signal, as shown in Figure 4, comprising:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated the described first level saltus step feature and the second level saltus step characteristic matching, determine to detect the ColorBurst signal, the described second level saltus step is characterized as the level saltus step feature of standard C olorBurst signal;
The amplitude acquisition module is used for obtaining according to the first level saltus step feature of preserving the amplitude of ColorBurst signal.
Behind ColorBurst signal that detects and amplitude information thereof, the embodiment of the invention also provides a kind of digital television signal restoration methods.
The embodiment of the invention must the digital television signal restoration methods comprise:
Step 35, the digital television signal that the amplitude recovery of the ColorBurst signal that utilization obtains receives.
And the digital television signal recovery device of the embodiment of the invention comprises:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated the described first level saltus step feature and the second level saltus step characteristic matching, determine to detect the ColorBurst signal, the described second level saltus step is characterized as the level saltus step feature of standard C olorBurst signal;
The amplitude acquisition module is used for obtaining according to the first level saltus step feature of preserving the amplitude of ColorBurst signal;
Recover module, be used for recovering the digital television signal that receives according to the amplitude of ColorBurst signal.
In the above-described embodiment, be to be the explanation that example is carried out with NTSC, but the embodiment of the invention can be applied to the digital television signal of pal mode equally, its difference only is the amplitude of saltus step and the difference between the number of times, so be not described in detail at this.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. signal detection method is used for detecting the look pulse signal of digital television signal, it is characterized in that, comprising:
Scan line signal in the receiving digital television signal;
Obtain and preserve the first level saltus step feature of line scan signals by predetermined period;
The more described first level saltus step feature and the second level saltus step feature, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
When comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal;
Described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; Hopping amplitude with the level saltus step.
2. method according to claim 1 is characterized in that, also comprises:
Obtain the amplitude of described look pulse signal according to the described first level saltus step feature of preserving.
3. a digital television signal restoration methods is characterized in that, comprising:
Scan line signal in the receiving digital television signal;
Obtain and preserve the first level saltus step feature of line scan signals by predetermined period;
The more described first level saltus step feature and the second level saltus step feature, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
When comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal;
Obtain the amplitude of described look pulse signal according to the described first level saltus step feature of preserving;
Recover described digital television signal according to the amplitude of described look pulse signal;
Described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
4. signal sensing device is used for detecting the look pulse signal of digital television signal, it is characterized in that, comprising:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
Described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
5. device according to claim 4 is characterized in that, also comprises:
The amplitude acquisition module is used for obtaining according to the described first level saltus step feature of preserving the amplitude of described look pulse signal.
6. a digital television signal recovery device is characterized in that, comprising:
Signal receiving module is used for the scan line signal of receiving digital television signal;
Level saltus step feature acquisition module is used for obtaining and preserving by predetermined period the first level saltus step feature of line scan signals;
The detecting judge module, be used for the more described first level saltus step feature and the second level saltus step feature, when comparative result is indicated described first level saltus step feature and the described second level saltus step characteristic matching, determine to detect described look pulse signal, the described second level saltus step is characterized as the level saltus step feature of reference colour pulse signal;
The amplitude acquisition module is used for obtaining according to the described first level saltus step feature of preserving the amplitude of described look pulse signal;
Recover module, be used for recovering described digital television signal according to the amplitude of described look pulse signal;
Described level saltus step feature comprises at least two in the following parameter:
The level value of level saltus step starting point;
The level value of level saltus step end point;
The transition times of level saltus step; With
The hopping amplitude of level saltus step.
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| CN2008101056386A CN101282487B (en) | 2008-04-30 | 2008-04-30 | Method and apparatus for detecting signal as well as method and apparatus for recovering digital television signal |
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| CN2008101056386A CN101282487B (en) | 2008-04-30 | 2008-04-30 | Method and apparatus for detecting signal as well as method and apparatus for recovering digital television signal |
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| CN2008101056386A Expired - Fee Related CN101282487B (en) | 2008-04-30 | 2008-04-30 | Method and apparatus for detecting signal as well as method and apparatus for recovering digital television signal |
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| US4649420A (en) * | 1985-06-12 | 1987-03-10 | Zenith Electronics Corporation | Automatic frequency response correction using color burst |
| CN1086653A (en) * | 1992-06-01 | 1994-05-11 | 汤姆森消费电子(法国)有限公司 | Auxiliary video data slicer |
| CN1296704A (en) * | 1999-03-08 | 2001-05-23 | 松下电器产业株式会社 | Color demodulating device |
| US6441871B1 (en) * | 1998-08-31 | 2002-08-27 | International Business Machines Corporation | Method for correcting amplitude of synchronizing signal of composite video signal and device therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4649420A (en) * | 1985-06-12 | 1987-03-10 | Zenith Electronics Corporation | Automatic frequency response correction using color burst |
| CN1086653A (en) * | 1992-06-01 | 1994-05-11 | 汤姆森消费电子(法国)有限公司 | Auxiliary video data slicer |
| US6441871B1 (en) * | 1998-08-31 | 2002-08-27 | International Business Machines Corporation | Method for correcting amplitude of synchronizing signal of composite video signal and device therefor |
| CN1296704A (en) * | 1999-03-08 | 2001-05-23 | 松下电器产业株式会社 | Color demodulating device |
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| Title |
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| JP特开2001-169304A 2001.06.22 |
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