CN102263964B - Method and device for stably displaying mobile analog television image - Google Patents

Method and device for stably displaying mobile analog television image Download PDF

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CN102263964B
CN102263964B CN201010194913.3A CN201010194913A CN102263964B CN 102263964 B CN102263964 B CN 102263964B CN 201010194913 A CN201010194913 A CN 201010194913A CN 102263964 B CN102263964 B CN 102263964B
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signal
difference
index signal
row index
synchronizing signal
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CN102263964A (en
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张辉
王西强
杨利
钱炜
吕悦川
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Changshu Intellectual Property Operation Center Co ltd
Chong Yi Technology Group Ltd
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Innofidei Technology Co Ltd
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Abstract

The invention provides a method for stably displaying a mobile analog television image. After an analog television signal received by an antenna is processed by a filter, a low-noise amplifier, a zero intermediate frequency converter and an analog/digital converter, the method comprises the following steps of: A, demodulating the analog television signal subjected to analog/digital conversion to acquire a composite video broadcast signal (CVBS); B, decoding the CVBS to acquire an image signal, and extracting a line indicating signal in the image signal; detecting the CVBS to acquire a line synchronizing signal; and C, calculating a difference between the line synchronizing signal and the line indicating signal, and adjusting the line indicating signal and a content indicating signal in the image signal according to the different so as to make the adjusted positions of the line indicating signal and the line synchronizing signal consistent. The invention also provides a device for stably displaying the mobile analog television image. By the technical scheme, display offset of the analog television image can be effectively suppressed in the mobile process.

Description

The method and apparatus that a kind of mobile analog television image stabilization shows
Technical field
The present invention relates to mobile analog television signalling technique field, the method and apparatus that particularly a kind of mobile analog television image stabilization shows.
Background technology
Having there is considerable time as a ripe technical standard in analogue television standards, and is widely used.Simulated television receiving equipment needs to receive and process the TV signal spreading out of from each TV station's analog signal transmitter in real time, realizes the synchronous broadcasting of analog television program.Traditional simulated television receiving equipment lacks single process chip, needs tuner, demodulator, and a plurality of simulation process modules such as decoder, volume is large, and power consumption is large, thereby is mainly used in household consumption electrical equipment, namely common family expenses colour TV.
Develop rapidly along with CMOS technology; the solution that makes simulated television receive one chip becomes possibility; solution is the solution that simulation or digital-to-analogue are mixed by original single analog circuit derivation; reduced volume; reduce power consumption, thereby made simulated television be applied to the Mobile portable equipments such as mobile phone.In prior art, the device of common digital-to-analogue hybrid mode reception anolog TV signals can be with reference to shown in figure 1.Filter 102, low noise amplifier 103, zero intermediate frequency transducer 104 are simulation process device, and they receive the analog signal of TV station's transmitting this locality by antenna 101 and convert baseband signal to and process for subsequent module.Analog to digital converter 105 converts analog signal to digital signal, demodulator 106 subsequently, voice decoder 109, image decoder 110 and clock recovery device 108 are digital processing device, wherein clock recovery device 108 extracts clock frequency from the signal of TV station's transmitting, according to the local clock signal of this clock frequency and local clock 107 generations, recover TV station's transmitting terminal clock signal, the TV station's transmitting terminal clock signal that recovers recovering exports respectively analog to digital converter 105 to, demodulator 106, voice decoder 109 and image decoder 110, make above-mentioned digital processing device can adopt the clock synchronous with TV station, thereby make image energy normal decoder and show.
This structure is relatively applicable to non-mobile device.For mobile device, owing to there being the effects such as multipath Doppler (doppler) in moving process, add altering a great deal of signal to noise ratio (snr), clock tracing extracts and has certain time delay or distortion, can cause image in moving process to show unstable, the problem that has double swerve, affects viewing effect.
As shown in Figure 2, composite video broadcast singal (CVBS) is the data-signal after demodulator 106 demodulation.CVBS has line synchronizing signal every fixing a period of time in picture material, line synchronizing signal has width and height (level) is fixing and the minimum feature of level so that receiver identification.
In image decoder, for the transmitting station clock that CVBS to be carried out to the clock of image decoding be clock recovery device 108 recovers according to local clock signal and described line synchronizing signal.If the transmitting station clock that this recovers is consistent with the clock of TV station's reality, the spacing between the row index signal that decoding obtains is so fixed, the image stabilization demonstrating; If this clock is slower than the clock of TV station's reality, the spacing between the row index signal obtaining according to the transmitting station clock decoding recovering so can be wider than the spacing between adjacent 2 start of line points actual in picture signal.So, take row index signal will lag behind the starting point of this row reality as the starting point of the row according in definite picture signal.The image demonstrating like this will left avertence.Otherwise, if this clock faster than TV station's transmit clock, the row index signal of decoding can be narrower than actual reception picture signal so, the image demonstrating is understood right avertence.If this clock is because analog television receiver is in mobile medium reason, frequency jitter is larger, can cause image to show for a moment left avertence right avertence for a moment, occurs the situation of double swerve, and impact is watched.
Summary of the invention
The invention provides the method and apparatus that a kind of mobile analog television image stabilization shows, can effectively suppress simulated television image display offset in moving process.
The embodiment of the present invention has proposed a kind of method that mobile analog television image stabilization shows, the anolog TV signals of antenna reception after filter, low noise amplifier, zero intermediate frequency transducer and analog to digital converter are processed, are handled as follows successively:
A, to the anolog TV signals demodulation after analog-to-digital conversion, obtain composite video broadcast singal CVBS;
B, described CVBS decoding is obtained to picture signal, extract the row index signal in described picture signal; Detect described CVBS and obtain line synchronizing signal;
C, calculate the difference between line synchronizing signal and row index signal, according to described difference, adjust row index signal and the content index signal in picture signal, make row index signal after adjustment and the position consistency of line synchronizing signal;
Difference between described calculating line synchronizing signal and row index signal comprises:
C1, calculating line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i;
C2, judge whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX], if negative direction exceeds, difference is set as if positive direction exceeds, difference is set as
Figure GDA00003596318900031
if do not exceed described scope, difference is set as
Figure GDA00003596318900033
Preferably, before calculating the difference between line synchronizing signal and row index signal described in step C, further comprise: by line synchronizing signal time delay.
Preferably, described row index signal and the content index signal of adjusting in picture signal according to described difference is:
If described difference for negative, the row index signal in described picture signal and content index signal are adjusted left
Figure GDA00003596318900035
; If described difference
Figure GDA00003596318900036
for just, the row index signal in described picture signal and content index signal are adjusted to the right
Figure GDA00003596318900037
, wherein,
Figure GDA00003596318900038
represent difference
Figure GDA00003596318900039
absolute value.
Preferably, before described step C2, further comprise: described difference DELTA is carried out to low-pass filtering.
The embodiment of the present invention also proposes the device that a kind of mobile analog television image stabilization shows, this device comprises:
Synchronized signal detector (401), for detection of composite video broadcast singal, CVBS obtains line synchronizing signal, and exports described line synchronizing signal;
Synchronizing signal position comparator (403), for extracting the row index signal of the picture signal that described CVBS decoding obtains, calculates line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i, and export described difference DELTA to clamper (405);
Clamper (405), for judging whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX]if negative direction exceeds, difference is set as
Figure GDA00003596318900041
if positive direction exceeds, difference is set as
Figure GDA00003596318900042
if do not exceed described scope, difference is set as
Figure GDA00003596318900043
and by difference export output adjuster (406) to;
Output adjuster (406), for adjust row index signal and the content index signal of picture signal according to described difference, makes row index signal after adjusting and the position consistency of line synchronizing signal.
Preferably, described device further comprises: delayer (402), for the line synchronizing signal of described synchronized signal detector (401) output is carried out to delay process, then the line synchronizing signal after delay process is exported to synchronizing signal position comparator (403).
Preferably, described device further comprises: low pass filter (404), for the difference of described synchronizing signal position comparator (403) output is carried out to low-pass filtering, and exports filtered difference to clamper (405).
Preferably, described output adjuster (406), for judging the positive and negative of received difference, if described difference is for negative, is adjusted the row index signal in described picture signal and content index signal left; If described difference, for just, is adjusted the row index signal in described picture signal and content index signal to the right, adjusting range is equal to the absolute value of described difference.
The embodiment of the present invention also proposes the device that a kind of digital-to-analogue hybrid mode receives anolog TV signals; comprise: antenna (101), filter (102), low noise amplifier (103), zero intermediate frequency transducer (104), analog to digital converter (105), demodulator (106) and image decoder (110); described device also comprises image shaper (111), and described image shaper (111) comprising:
Synchronized signal detector (401), the composite video broadcast singal CVBS exporting for detection of described demodulator (106) obtains line synchronizing signal, and exports described line synchronizing signal;
Synchronizing signal position comparator (403), for extracting the row index signal of the picture signal of described image decoder (110) output, calculates line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i, and export described difference DELTA to clamper (405);
Clamper (405), for judging whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX], if negative direction exceeds, difference is set as
Figure GDA00003596318900051
if positive direction exceeds, difference is set as if do not exceed described scope, difference is set as
Figure GDA00003596318900053
and by difference
Figure GDA00003596318900054
export output adjuster (406) to;
Output adjuster (406), for adjust row index signal and the content index signal of picture signal according to described difference, makes row index signal after adjusting and the position consistency of line synchronizing signal.
As can be seen from the above technical solutions, by calculating the difference between line synchronizing signal and row index signal, according to described difference, row index signal and content index signal are adjusted accordingly skew that can correcting image.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that digital-to-analogue hybrid mode of the prior art receives anolog TV signals;
Fig. 2 is transmitting station clock and the inconsistent schematic diagram of the actual clock of TV station recovering;
Fig. 3 is the device schematic diagram that the digital-to-analogue hybrid mode of embodiment of the present invention proposition receives anolog TV signals;
Fig. 4 is the internal module block diagram of the image shaper 111 in Fig. 3;
Fig. 5 is the schematic diagram that embodiment of the present invention scheme is adjusted image.
Embodiment
The device of the digital-to-analogue hybrid mode reception anolog TV signals that the embodiment of the present invention proposes as shown in Figure 3, compared to Figure 1, has increased an image reshaper 111 in the rear end of image decoder 110.
Image reshaper 111 specific implementation block diagrams as shown in Figure 4.
CVBS is the data-signal obtaining after demodulator 106 demodulation, because the line synchronizing signal of CVBS has the advantages that level value is minimum, line synchronizing signal detector 401 can find synchronizing signal by finding the method for minimum value, is designated as P s.Can CVBS be passed through to image reshaper 111 by image decoder 110, the signal transmission passage between demodulator 106 and image reshaper 111 also can be set, decoder 106 directly transfers to CVBS image shaper 111.
Picture signal is the signal that image decoder 110 is decoded and obtained.Picture signal comprises decoded picture material and control signal (row index signal, an index signal and content index signal), the transmitting station clock generating that wherein row index signal is recovered by clock recovery device 108, initial in order to the every row of indicating image, be designated as P i.
The synchronizing signal P of delayer 402 for line synchronizing signal detector 401 is found stime delay, to compensate the time difference of CVBS and picture signal, the synchronizing signal position after time delay is designated as P sd.This module is optional module.
The row sync bit P that synchronizing signal position comparator 403 detects synchronized signal detector 401 sd(or P s) and row index signal P icompare, by both difference output Δ=P sd-P i, difference DELTA can be positive number or negative.
Low pass filter 404 is for this difference DELTA is carried out to low-pass filtering, in order to eliminate the impact of high frequency saltus step.Low pass filter 404 is optional module.
Clamper 405 is for setting the output adjusting range [Δ of a permissible maximum mAX, Δ mAX].Scope [the Δ setting in advance described in whether the difference DELTA of clamper 405 judgement inputs exceeds mAX, Δ mAX], if negative direction exceeds, difference is set as-Δ mAXif positive direction exceeds, difference is set as to Δ mAXif, do not exceed described scope, the value of difference DELTA is constant.All values that surpasses this scope (comprising forward and negative term) are all clamped to maximum permissible value.Permissible maximum output adjusting range can be made configurable.Difference after low pass filter and clamper is designated as
Figure GDA00003596318900066
.The effect of clamper 405 is to prevent that the adjusting range of row index signal and content index signal is excessive, and this module is also optional module.
Output adjuster 406 is for according to difference
Figure GDA00003596318900067
picture signal is adjusted.Specifically see shown in chart 5.Adjustment index signal and the content index signal transmitting station clock generating by local recovery that moves ahead.Can find out, when the situation that is slower than the actual clock of transmitting station, image left avertence when the transmitting station clock of local recovery occurs,
Figure GDA00003596318900061
value should be negative value, and row index signal and content index signal take over respect to actual picture signal, should adjust left
Figure GDA00003596318900062
(
Figure GDA00003596318900063
value takes absolute value).When the transmitting station clock of local recovery occurs faster than the situation of the actual clock of transmitting station, image right avertence,
Figure GDA00003596318900064
value should be on the occasion of, row index signal and content index signal are taken back with respect to actual picture signal, should adjust to the right
Figure GDA00003596318900065
.Row index signal after adjustment and the position of line synchronizing signal are consistent, and the content index signal after adjustment can correctly be indicated actual picture position, image are shown stable.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (9)

1. the method that mobile analog television image stabilization shows, is characterized in that, the anolog TV signals of antenna reception after filter, low noise amplifier, zero intermediate frequency transducer and analog to digital converter are processed, are handled as follows successively:
A, to the anolog TV signals demodulation after analog-to-digital conversion, obtain composite video broadcast singal CVBS;
B, described CVBS decoding is obtained to picture signal, extract the row index signal in described picture signal; Detect described CVBS and obtain line synchronizing signal;
C, calculate the difference between line synchronizing signal and row index signal, according to described difference, adjust row index signal and the content index signal in picture signal, make row index signal after adjustment and the position consistency of line synchronizing signal;
Difference between described calculating line synchronizing signal and row index signal comprises:
C1, calculating line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i;
C2, judge whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX], if negative direction exceeds, difference is set as
Figure FDA0000457102990000011
if positive direction exceeds, difference is set as
Figure FDA0000457102990000012
if do not exceed described scope, difference is set as
2. method according to claim 1, is characterized in that, before calculating the difference between line synchronizing signal and row index signal described in step C, further comprises:
By line synchronizing signal time delay.
3. method according to claim 1, is characterized in that, described row index signal and the content index signal of adjusting in picture signal according to described difference is:
If described difference
Figure FDA0000457102990000014
for negative, the row index signal in described picture signal and content index signal are adjusted left
Figure FDA0000457102990000015
if described difference
Figure FDA0000457102990000016
for just, the row index signal in described picture signal and content index signal are adjusted to the right wherein,
Figure FDA0000457102990000018
represent difference
Figure FDA0000457102990000019
absolute value.
4. method according to claim 1, is characterized in that, before described step C2, further comprises: described difference DELTA is carried out to low-pass filtering.
5. the device that mobile analog television image stabilization shows, is characterized in that, this device comprises:
Synchronized signal detector (401), for detection of composite video broadcast singal, CVBS obtains line synchronizing signal, and exports described line synchronizing signal;
Synchronizing signal position comparator (403), for extracting the row index signal of the picture signal that described CVBS decoding obtains, calculates line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i, and export described difference DELTA to clamper (405);
Clamper (405), for judging whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX], if negative direction exceeds, difference is set as
Figure FDA0000457102990000021
if positive direction exceeds, difference is set as
Figure FDA0000457102990000022
if do not exceed described scope, difference is set as
Figure FDA0000457102990000023
and by difference
Figure FDA0000457102990000024
export output adjuster (406) to;
Output adjuster (406), for adjust row index signal and the content index signal of picture signal according to described difference, makes row index signal after adjusting and the position consistency of line synchronizing signal.
6. device according to claim 5, it is characterized in that, described device further comprises: delayer (402), for the line synchronizing signal of described synchronized signal detector (401) output is carried out to delay process, then the line synchronizing signal after delay process is exported to synchronizing signal position comparator (403).
7. device according to claim 5, it is characterized in that, described device further comprises: low pass filter (404), for the difference of described synchronizing signal position comparator (403) output is carried out to low-pass filtering, and exports filtered difference to clamper (405).
8. device according to claim 7, is characterized in that, described output adjuster (406), for judging the positive and negative of received difference, if described difference is for negative, is adjusted the row index signal in described picture signal and content index signal left; If described difference, for just, is adjusted the row index signal in described picture signal and content index signal to the right, adjusting range is equal to the absolute value of described difference.
9. a digital-to-analogue hybrid mode receives the device of anolog TV signals; comprise: antenna (101), filter (102), low noise amplifier (103), zero intermediate frequency transducer (104), analog to digital converter (105), demodulator (106) and image decoder (110); it is characterized in that; described device also comprises image shaper (111), and described image shaper (111) comprising:
Synchronized signal detector (401), the composite video broadcast singal CVBS exporting for detection of described demodulator (106) obtains line synchronizing signal, and exports described line synchronizing signal;
Synchronizing signal position comparator (403), for extracting the row index signal of the picture signal of described image decoder (110) output, calculates line synchronizing signal P swith row index signal P ibetween difference DELTA=P s-P i, and export described difference DELTA to clamper (405);
Clamper (405), for judging whether difference DELTA exceeds the scope [Δ setting in advance mAX, Δ mAX], if negative direction exceeds, difference is set as
Figure FDA0000457102990000031
if positive direction exceeds, difference is set as
Figure FDA0000457102990000032
if do not exceed described scope, difference is set as
Figure FDA0000457102990000033
and by difference
Figure FDA0000457102990000034
export output adjuster (406) to;
Output adjuster (406), for adjust row index signal and the content index signal of picture signal according to described difference, makes row index signal after adjusting and the position consistency of line synchronizing signal.
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