CN102158634B - Vertical synchronization signal separation device and method - Google Patents
Vertical synchronization signal separation device and method Download PDFInfo
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- CN102158634B CN102158634B CN2011100266088A CN201110026608A CN102158634B CN 102158634 B CN102158634 B CN 102158634B CN 2011100266088 A CN2011100266088 A CN 2011100266088A CN 201110026608 A CN201110026608 A CN 201110026608A CN 102158634 B CN102158634 B CN 102158634B
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Abstract
The invention discloses a vertical synchronization signal separation device and a vertical synchronization signal separation method. The vertical synchronization signal separation device comprises a parameter sensing unit, a threshold generation unit and a vertical synchronization signal generation unit, wherein the parameter sensing unit measures a composite synchronization signal, thereby obtaining a maximum positive pulse width, a second maximum positive pulse width, a maximum negative pulse width and a second maximum negative pulse width of the composite synchronization signal; the threshold generation unit outputs a positive pulse threshold according to the maximum positive pulse width and the second maximum positive pulse width, and outputs a negative pulse threshold according to the maximum negative pulse width and the second maximum negative pulse width; and the vertical synchronization signal generation unit compares a composite synchronization signal by utilizing the positive pulse threshold and the negative pulse threshold, thereby outputting a vertical synchronization signal. Therefore, the device can accurately separate the vertical synchronization signal from the composite synchronization signals of different standards, and can achieve an improvement in compatibility.
Description
Technical field
The present invention relates to composite synchronizing signal (Composite sync signal) processing technology field, particularly a kind of device and method that from composite synchronizing signal, separates vertical synchronizing signal (Vertical sync signal).
Background technology
When transmission hd-tv (HDTV), often adopt the color-code mode of Y (luminance signal), UV (two concentration signal) or R (redness), G (green), B (blueness) to carry out the image transmission.That is to say; Hd-tv (HDTV) is luminance signal (Luminancesignal with video conversion often; Be called for short Y) and two concentration signals (Chrominance signal is called for short U, V), or be converted into danger signal R, green G and blue signal B.Wherein, composite synchronizing signal (Composite sync signal) will be mixed among brightness signal Y or the green G.
Difference according to specification standards; Composite synchronizing signal is by horizontal-drive signal (horizontalsynchronization signal), vertical synchronizing signal (vertical synchronization signal), blank signal (blank signal) or other signal combines, for example vision signal, audio signal etc.Image receiving terminal (Rx) just carries out Signal Separation after receiving composite synchronizing signal, thereby therefrom obtains level and vertical synchronizing signal, makes display carry out the image scan action according to horizontal-drive signal and vertical synchronizing signal.
There are many technical methods can from composite synchronizing signal, isolate vertical synchronizing signal.Yet because the time response of every kind of image standard and inequality, therefore many isolation technics only can be applied in the specific criteria, and can't from all standards and off-gauge composite synchronizing signal, isolate vertical synchronizing signal neatly.In addition, whether the part technology can receive in advance and compare reference signal embedded in synchronizing signal, be known reference format thereby differentiate this synchronizing signal.But when synchronizing signal is noncanonical format, these technology just can't be isolated vertical synchronizing signal reliably.Therefore, many manufacturers just hope to develop the isolation technics that can be applicable to all standards and non-standard composite synchronizing signal, thereby can therefrom isolate the required vertical synchronizing signal of image reliably.
Summary of the invention
The present invention provides a kind of vertical synchronizing signal separator, and it can support all low-and high-frequency, opposed polarity and standard, off-gauge composite synchronizing signal, uses and correctly isolates vertical synchronizing signal.
On the other hand, the present invention provides a kind of vertical synchronizing signal separation method, and it can support all low-and high-frequency, opposed polarity and standard, off-gauge composite synchronizing signal, uses and correctly isolates vertical synchronizing signal.
The present invention proposes a kind of vertical synchronizing signal separator, includes parameter detecting unit, threshold value generation unit and vertical synchronizing signal generation unit.The parameter detecting unit receives and the measurement composite synchronizing signal, thereby obtains parameters such as the maximum positive pulse width of composite synchronizing signal, inferior big positive pulse width, maximum negative pulse duration and time big negative pulse width.The threshold value generation unit is connected with the parameter detecting unit, and it reaches time big positive pulse width with output positive pulse threshold value according to maximum positive pulse width, and exports the negative pulse threshold value according to maximum negative pulse duration and inferior big negative pulse width.The vertical synchronizing signal generation unit then according to positive pulse threshold value and negative pulse threshold value so that composite synchronizing signal is compared, thereby the output vertical synchronizing signal.
In one embodiment of this invention, above-mentioned positive pulse threshold value should reach between time big positive pulse width in maximum positive pulse width, and the negative pulse threshold value should be in maximum negative pulse duration and inferior greatly between the negative pulse width.
In one embodiment of this invention; Above-mentioned vertical synchronizing signal generation unit is when detecting the positive edge of composite synchronizing signal; Positive edge counter just makes zero and begins counting, and when gate time arrived the positive pulse threshold value, the vertical synchronizing signal generation unit enabled vertical synchronizing signal.Relatively, the vertical synchronizing signal generation unit is when sensing the negative edge of composite synchronizing signal, and positive edge counter just makes zero and begins counting, and when gate time arrived the negative pulse threshold value, the vertical synchronizing signal generation unit was just with the vertical synchronizing signal forbidden energy.
In one embodiment of this invention; When the maximum negative pulse duration equals time big positive pulse width greater than maximum positive pulse width, maximum positive pulse width; And inferior big positive pulse width is during less than inferior big negative pulse width, the negative pulse threshold value should greater than and near time big negative pulse width.
From another angle; The present invention proposes a kind of vertical synchronizing signal separation method; Comprise the following steps: to receive and measure composite synchronizing signal, thereby obtain the maximum positive pulse width of composite synchronizing signal, inferior big positive pulse width, maximum negative pulse duration and time big negative pulse width.Then, export the positive pulse threshold value, and export the negative pulse threshold value according to maximum negative pulse duration and time big negative pulse width according to maximum positive pulse width and time big positive pulse width.And, according to positive pulse threshold value and negative pulse threshold value composite synchronizing signal is compared, thus the output vertical synchronizing signal.
Based on above-mentioned, the embodiment of the invention utilizes the positive pulse of composite synchronizing signal and negative pulse width to set out respectively the threshold value of positive pulse and negative pulse respectively, and utilizes these threshold values from composite synchronizing signal, to distinguish out vertical synchronizing signal.Therefore, the vertical synchronizing signal separator of present embodiment can be supported the composite synchronizing signal of present known all standards and non-standard, different frequency and opposed polarity, and can correctly isolate vertical synchronizing signal, thereby promotes its range of application and performance.
Description of drawings
Fig. 1 includes the image signal processing system structural representation of vertical synchronizing signal separator for the embodiment of the invention.
Fig. 2 is the structural representation of embodiment of the invention vertical synchronizing signal separator.
Fig. 3 is the flow chart of first embodiment of the invention vertical synchronizing signal separation method.
Fig. 4 is the composite synchronizing signal and the vertical synchronizing signal oscillogram of 720p25 standard.
Fig. 5 is the composite synchronizing signal and the vertical synchronizing signal oscillogram of SERR 0.5H standard.
Fig. 6 is composite synchronizing signal and the vertical synchronizing signal oscillogram that meets the H+V standard of first embodiment.
Fig. 7 is the flow chart of the vertical synchronizing signal separation method of second embodiment of the invention.
Fig. 8 is composite synchronizing signal and the vertical synchronizing signal oscillogram that meets the H+V standard of second embodiment.
Label declaration in the accompanying drawing
100: image signal processing system
102: the image carrying signal
110: signal limiter
112,412,512,612,812: composite synchronizing signal
120: the vertical synchronizing signal separator
122,422,522,622,822: vertical synchronizing signal
130: pulse generator
140: display unit
210: the parameter detecting unit
220: the threshold value generation unit
230: the vertical synchronizing signal generation unit
A～H, A '～H ': time point
MPPW: maximum positive pulse width
SPPW: inferior big positive pulse width
MNPW: maximum negative pulse duration
SNPW: inferior big negative pulse width
S310～S720: step
PE: positive pulse
T
UP: the positive pulse threshold value
T
DN: the negative pulse threshold value
I
DIS: the forbidden energy of desirable vertical synchronizing signal is interval
I
DIS': the forbidden energy of actual vertical synchronizing signal is interval
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to further explain of the present invention.In addition, all possibility parts, the identical or similar portions of assembly/member/symbology of use same numeral in graphic and execution mode.
Please with reference to Fig. 1, Fig. 1 includes the structural representation of the image signal processing system of vertical synchronizing signal separator 120 for the embodiment of the invention.Image signal processing system 100 includes signal limiter 110, vertical synchronizing signal separator 120, pulse generator 130 and display unit 140.In the present embodiment; Signal limiter 110 receive image carrying signals 102 (in the present embodiment with luminance signal (Luminance signal) Y of YUV video conversion form as execution mode; But be not restricted to this), and utilize a voltage threshold from image carrying signal 102, to limit and isolate composite synchronizing signal (Composite sync signal) 112.
Then, vertical synchronizing signal separator 120 is just isolated vertical synchronizing signal 122 from composite synchronizing signal 112, and exports vertical synchronizing signal 122 to pulse generator 130.Therefore, those skilled in the art can know that pulse generator 130 then just can carry out the image scan action according to this vertical synchronizing signal 122, so that signal is shown on the display unit 140.In addition; Using the present embodiment person should be appreciated that based on its design requirement; When image carrying signal 102 alternate manners capable of using or but direct separation goes out composite synchronizing signal 112; Thereby when inputing to vertical synchronizing signal separator 120, image signal processing system 100 just need not possess signal limiter 110 is arranged.
Thus; Focusing on of the embodiment of the invention; Vertical synchronizing signal separator 120 can be supported the composite synchronizing signal 112 of present known all standards and non-standard, different frequency and opposed polarity; And can correctly isolate vertical synchronizing signal 122, thereby promote the range of application and the performance of vertical synchronizing signal separator 120.Therefore, below will specify the function structure and the manner of execution of vertical synchronizing signal separator 120, and illustrate as example with Fig. 4.
Fig. 2 is the structural representation of the vertical synchronizing signal separator 120 of inventive embodiments; Fig. 3 is the flow chart of the vertical synchronizing signal separation method of first embodiment of the invention, and Fig. 4 then is the composite synchronizing signal 412 and vertical synchronizing signal 422 oscillograms of 720p25 standard.Wherein, vertical synchronizing signal separator 120 includes parameter detecting unit 210, threshold value generation unit 220 and vertical synchronizing signal generation unit 230.In the present embodiment, threshold value generation unit 220 couples respectively with parameter detecting unit 210 and vertical synchronizing signal generation unit 230, and vertical synchronizing signal generation unit 230 also couples with parameter detecting unit 210.
Please cooperate Fig. 4 to carry out reference with Fig. 2 and Fig. 3; At first in step S310; Parameter detecting unit 210 receives composite synchronizing signal 412; And the duration of each section positive pulse (positivepulse) and negative pulse (negative pulse) in the detecting composite synchronizing signal 412, thereby obtain the relevant parameter of composite synchronizing signal 412.Present embodiment is referred to as pulse duration (pulse width) with every period pulse duration, thus simplified illustration.Fig. 4 is the oscillogram of composite synchronizing signal 112 and vertical synchronizing signal 122, and wherein the label of composite synchronizing signal is 412, and the label of vertical synchronizing signal is 422.And; Positive pulse width that parameter detecting unit 210 is the longest with the duration and negative pulse width, long positive pulse width and negative pulse width of duration second deposit in respectively in the parameters such as maximum positive pulse width MPPW, maximum negative pulse duration MNPW, inferior big positive pulse width SPPW and time big negative pulse width SNPW (as shown in Figure 4), and these parameters are sent to threshold value generation unit 220.
In step S320, threshold value generation unit 220 produces positive pulse threshold value T according to maximum positive pulse width MPPW and time big positive pulse width SPPW
UP, and produce negative pulse threshold value T according to maximum negative pulse duration MNPW and time big negative pulse width SNPW
DNIn the present embodiment, those skilled in the art should come to adjust the positive pulse threshold value T that chooses according to the specification standards of its design requirement and composite synchronizing signal 412 thereupon
UPAnd positive pulse threshold value T
DN, so that positive pulse threshold value T
UPNumerical value between maximum positive pulse width MPPW and time big positive pulse width SPPW, and negative pulse threshold value T
DNNumerical value then between maximum negative pulse duration MNPW and time big negative pulse width SNPW.In Fig. 4, positive pulse threshold value T
UPNumerical value will be between 53us and 32us.
Then, vertical synchronizing signal generation unit 230 just can receive and according to positive pulse threshold value T
UPAnd negative pulse threshold value T
DNComposite synchronizing signal 412 is compared, thus output vertical synchronizing signal 422.Particularly, in the present embodiment, vertical synchronizing signal generation unit 230 includes positive edge counter PC and negative edge counter NC (not shown).When step S320; When vertical synchronizing signal generation unit 230 detects the positive edge of composite synchronizing signal 412; In other words; When the positive edge that the positive edge counter PC in the vertical synchronizing signal generation unit 230 receives composite synchronizing signal 412 triggers (like time point A, B, C and the D of Fig. 4), just get into step S340, positive edge counter PC makes zero and begins counting.And; Arrive at the gate time of positive edge counter PC under the situation of positive pulse threshold value TUP (like time point A ' and D '); Just get into step S360 by step S350, vertical synchronizing signal generation unit 230 enables vertical synchronizing signal 422, and in the present embodiment; 230 of vertical synchronizing signal generation units are that vertical synchronizing signal 422 is set at logical one to be enabled; But the present invention is not restricted to this, and in other words, other embodiment can also be set at logical zero to be enabled with vertical synchronizing signal 422.
On the other hand, positive edge counter PC is at also no show positive pulse of its gate time threshold value T
UPBefore when just receiving the negative edge of composite synchronizing signal 412; In other words; When the negative edge that positive edge counter PC in the vertical synchronizing signal generation unit 230 and negative edge counter NC receive composite synchronizing signal 412 triggers (like time point B ' and the C ' of Fig. 4); Just get back to step S330 so that positive edge counter PC stops counting from step S350, and get into step S380, thereby negative edge counter NC is made zero and begin counting (like time point E, E, G to H) through step S370.Gate time arrival negative pulse threshold value T when negative edge counter
DNThe time (like time point F ' and G '); Just get into step S395 by step S390; Vertical synchronizing signal generation unit 230 is with vertical synchronizing signal 422 forbidden energy; In the present embodiment, 230 of vertical synchronizing signal generation units are that vertical synchronizing signal 422 is set at logical zero being disabled state, but the present invention is not restricted to this.In other words, other embodiment can also be set at logical one to be disabled state with vertical synchronizing signal 422.
Likewise, negative edge counter NC is at also no show negative pulse of gate time threshold value T
DNBefore when just receiving the positive edge of composite synchronizing signal 412; In other words; When the positive edge that positive edge counter PC in the vertical synchronizing signal generation unit 230 and negative edge counter NC receive composite synchronizing signal 412 triggers (like time point E ' and the H ' of Fig. 4); Just get back to step S330 so that negative edge counter NC stops counting from step S390, and get into step S340 and positive edge counter PC is made zero and restart counting.
Based on above-mentioned, vertical synchronizing signal separator 120 is to utilize the relevant parameter of the composite synchronizing signal 412 of input to judge and isolate vertical synchronizing signal 422, therefore can support the composite synchronizing signal of multiple standards and different frequency.Because the positive pulse of the vertical synchronizing signal separator 120 of present embodiment and negative pulse judgment mode do not have because polarity is different difference to some extent; In other words; The high electronegative potential of positive pulse and negative pulse does not influence the generation of vertical synchronizing signal behind transposition, so the embodiment of the invention also can be supported the composite synchronizing signal (composite synchronizing signal that comprises standards such as 720p23,720p24,720p25, SERR, SERR 0.5H, H EORV and H+V) of opposed polarity.
Moreover positive edge counter PC in the above-mentioned vertical synchronizing signal generation unit 230 and negative edge counter NC are different counter in the present embodiment, and in other embodiments, positive edge counter PC and negative edge counter NC can also be same counter.This counter all can make zero and begin counting when the positive edge that receives composite synchronizing signal 412 triggers and bear the edge triggering.When the positive edge that receives composite synchronizing signal 412 triggered, counter judged just whether its gate time arrives positive pulse threshold value T
UPThereby, vertical synchronizing signal is enabled.Relatively, when the negative edge that receives composite synchronizing signal 412 when this counter triggered, counter judged just whether its gate time arrives negative pulse threshold value T
DNThereby, with the vertical synchronizing signal forbidden energy.Other action of counter is all similar with above-mentioned positive edge counter PC and negative edge counter NC with flow process, so repeat no more at this.
On the other hand, in the present embodiment, parameter detecting unit 210 will test constantly and is upgraded the relevant parameter in the composite synchronizing signal 412, makes the threshold value generation unit 220 can be automatically and dynamically change positive pulse threshold value T
UPAnd negative pulse threshold value T
DNTherefore, vertical synchronizing signal generation unit 230 is just exported vertical synchronizing signal accurately sustainably.
With the evidence embodiment of the invention, as shown in Figure 5, Fig. 5 is the composite synchronizing signal 512 and vertical synchronizing signal 522 oscillograms of SERR 0.5H standard in this composite synchronizing signal that proposes another standard.Because the judgment mode of present embodiment and action situation such as above-mentioned first embodiment are identical, just repeat no more at this.
Yet as shown in Figure 6, Fig. 6 is composite synchronizing signal 612 and vertical synchronizing signal 622 oscillograms that meet the H+V standard of first embodiment.Wherein, The dotted portion of vertical synchronizing signal 622 is the waveform under the perfect condition; Its solid line part then is actual vertical synchronizing signal 622 waveforms that utilize after first embodiment carries out actual judgements, and the maximum positive pulse width MPPW of present embodiment and inferior positive pulse width SPPW greatly are all 53us.Because the composite synchronizing signal 612 of H+V standard is only at the interval I of the forbidden energy of desirable vertical synchronizing signal 622
DISEnd has a positive pulse PE, and at the interval I of forbidden energy
DISOther zone in do not have any pulse, and the threshold value generation unit 220 of Fig. 2 can be at random or other account form between the numerical value of maximum negative pulse duration MNPW and time big negative pulse width SNPW, obtain negative pulse threshold value T
DN, make the interval I of forbidden energy of actual vertical synchronizing signal 622
DIS' too short, thereby cause frequency inaccurate.
In view of this; Utilize the motion flow of function structure and Fig. 7 of Fig. 2 to propose to meet second embodiment of spirit of the present invention at this; And the oscillogram of cooperation Fig. 8, thereby solve the above-mentioned problem that can't correctly isolate vertical synchronizing signal 822 from the composite synchronizing signal 812 of H+V standard.Fig. 7 is the flow chart of the vertical synchronizing signal separation method of invention second embodiment, and Fig. 8 is composite synchronizing signal 812 and vertical synchronizing signal 822 oscillograms that meet the H+V standard of second embodiment.
Please be simultaneously with reference to Fig. 2, Fig. 7 and Fig. 8; The difference of present embodiment and above-mentioned first embodiment is; After parameter detecting unit 210 receives in step S310 and measures the relevant parameter of composite synchronizing signal 112; The threshold value generation unit 220 of present embodiment is judged the characteristic of the composite synchronizing signal 112 of H+V standard in step S710; Judge that promptly maximum negative pulse duration MNPW equals time big positive pulse width SPPW greater than maximum positive pulse width MPPW, maximum positive pulse width MPPW, and inferior big positive pulse width SPPW (whether the condition that is MNPW＞MPPW=SPPW＞SNPW) is set up greater than inferior big negative pulse width SNPW.
When the condition of step S710 is set up, represent that this composite synchronizing signal 812 should be the H+V standard, therefore just get into step S720, the negative pulse threshold value T that threshold value generation unit 220 is produced
DNShould be near time big negative pulse width SNPW, but than time big negative pulse width SNPW bigger (that is
And T
DN＞SNPW).Those of ordinary skills can choose suitable negative pulse threshold value T according to H+V standard composite synchronizing signal and vertical synchronizing signal characteristic
DNIn addition, among the step S720, positive pulse threshold value T
UPGeneration and judgment mode then identical with first embodiment.Relatively, when the condition of step S710 is false, represent this composite synchronizing signal 812 to should be other standard, therefore can continue according to the manner of execution of first embodiment to carry out.The interval I of its forbidden energy just can not take place in synchronous vertical signal 822 therefore, shown in Figure 8
DIS' the too short and problems such as frequency errors that cause.
In sum, the embodiment of the invention utilizes the positive pulse of composite synchronizing signal and the pulse duration of negative pulse to set out the threshold value of positive pulse and negative pulse respectively, and utilizes these threshold values from composite synchronizing signal, to identify vertical synchronizing signal.Therefore, the vertical synchronizing signal separator 120 of present embodiment can be supported the composite synchronizing signal of present known all standards and non-standard, different frequency and opposed polarity, and can correctly isolate vertical synchronizing signal, thereby promotes its range of application and performance.Certainly, if the composite synchronizing signal that adopts the mode of first embodiment of the invention to handle the H+V standard also can realize the separation of vertical synchronizing signal, and reach above-mentioned technique effect.And, further added the judgment mode of the composite synchronizing signal of H+V standard in the second embodiment of the invention, thereby solved because of the interval too short problems such as frequency errors that cause of the forbidden energy of vertical synchronizing signal.
More than lift preferred embodiment, the object of the invention, technical scheme and advantage have been carried out further explain, institute is understood that; The above is merely preferred embodiment of the present invention, is not limited to the present invention, and is all within spirit of the present invention and principle; Any modification of being done, be equal to replacement, improvement etc.; All should be included within protection scope of the present invention, the interest field that the present invention advocated should application range is said to be as the criterion to invent, but not only limits to the foregoing description.
Claims (14)
1. a vertical synchronizing signal separator is characterized in that, comprising:
One parameter detecting unit receives and measures a composite synchronizing signal with the maximum positive pulse width that obtains said composite synchronizing signal, once big positive pulse width, a maximum negative pulse duration and once big negative pulse width;
One threshold value generation unit is coupled to said parameter detecting unit, is used for according to said maximum positive pulse width and said big positive pulse width output positive pulse threshold value, and according to said maximum negative pulse duration and said big negative pulse width output negative pulse threshold value; And
One vertical synchronizing signal generation unit is used for according to said positive pulse threshold value and said negative pulse threshold value said composite synchronizing signal being compared, thereby exports a vertical synchronizing signal.
2. vertical synchronizing signal separator as claimed in claim 1; It is characterized in that; Wherein said positive pulse threshold value is between said maximum positive pulse width and said inferior big positive pulse width, and said negative pulse threshold value is between said maximum negative pulse duration and said inferior big negative pulse width.
3. vertical synchronizing signal separator as claimed in claim 2 is characterized in that, said vertical synchronizing signal generation unit comprises:
One positive edge counter when detecting the positive edge of said composite synchronizing signal, makes zero and begins counting, and when gate time arrives said positive pulse threshold value, said vertical synchronizing signal enabled; When said positive edge counter just detects the negative edge of said composite synchronizing signal before the said positive pulse threshold value of its gate time no show, stop to count said positive edge counter, negative edge counter makes zero and begins counting; And
One negative edge counter when detecting the negative edge of said composite synchronizing signal, makes zero and begins counting, and when gate time arrives said negative pulse threshold value, with said vertical synchronizing signal forbidden energy; When said negative edge counter just detects the said positive edge of said composite synchronizing signal before the said negative pulse threshold value of its gate time no show, stop to count said negative edge counter, positive edge counter makes zero and begins counting.
4. vertical synchronizing signal separator as claimed in claim 2 is characterized in that, said vertical synchronizing signal generation unit comprises: a counter; When detecting the positive edge of said composite synchronizing signal, said counter makes zero and begins counting, and when gate time arrives said positive pulse threshold value; Said vertical synchronizing signal is enabled; And when detecting the negative edge of said composite synchronizing signal, said counter makes zero and begins counting; And when gate time arrives said negative pulse threshold value, with said vertical synchronizing signal forbidden energy; When said counter just detects the said negative edge of said composite synchronizing signal before the said positive pulse threshold value of its gate time no show, stop to count said counter, it is made zero and begins count again; And, when said counter just detects the said positive edge of said composite synchronizing signal before the said negative pulse threshold value of its gate time no show, stop to count said counter, it is made zero and begins count again.
5. vertical synchronizing signal separator as claimed in claim 1; It is characterized in that; When said maximum negative pulse duration equals said time big positive pulse width and said big positive pulse width less than said big negative pulse width greater than said maximum positive pulse width, said maximum positive pulse width, set that said negative pulse threshold value is slightly larger than and near said big negative pulse width.
6. vertical synchronizing signal separator as claimed in claim 5; It is characterized in that, the standard of wherein said composite synchronizing signal be 720p25 standard, 720p24 standard, 720p23 standard, SERR, H EOR V, SERR0.5H standard and H+V standard one of them.
7. vertical synchronizing signal separator as claimed in claim 1; It is characterized in that; Wherein said parameter detecting unit test constantly and upgrade the said maximum positive pulse width of said composite synchronizing signal, said time big positive pulse width, said maximum negative pulse duration and said big negative pulse width makes said threshold value generation unit dynamically said positive pulse threshold value of adjustment and said negative pulse threshold value.
8. a vertical synchronizing signal separation method is characterized in that, said method comprises:
Receive and measure a composite synchronizing signal with the maximum positive pulse width that obtains said composite synchronizing signal, once big positive pulse width, a maximum negative pulse duration and once big negative pulse width;
According to said maximum positive pulse width and said big positive pulse width output positive pulse threshold value, and according to said maximum negative pulse duration and said big negative pulse width output negative pulse threshold value; And
According to said positive pulse threshold value and said negative pulse threshold value said composite synchronizing signal is compared, thereby export a vertical synchronizing signal.
9. vertical synchronizing signal separation method as claimed in claim 8; It is characterized in that; Wherein said positive pulse threshold value is between said maximum positive pulse width and said inferior big positive pulse width, and said negative pulse threshold value is between said maximum negative pulse duration and said inferior big negative pulse width.
10. vertical synchronizing signal separation method as claimed in claim 9 is characterized in that, exports said vertical synchronizing signal and comprises the following steps:
S330 judges whether to sense the positive edge of composite synchronizing signal, in this way, and execution in step S340, otherwise execution in step S370;
S340, positive edge counter makes zero and begins counting;
S350 judges whether the gate time of said positive edge counter arrives the positive pulse threshold value, execution in step S360 in this way, otherwise, return step S330;
S360 enables vertical synchronizing signal, and returns step S330;
S370 judges whether to sense the negative edge of composite synchronizing signal, in this way, and execution in step S380, otherwise, return step S330;
S380, negative edge counter makes zero and begins counting;
S390 judges whether the gate time of said negative edge counter arrives the negative pulse threshold value, execution in step S395 in this way, otherwise, return step S330;
S395 is the vertical synchronizing signal forbidden energy, and returns step S330.
11. vertical synchronizing signal separation method as claimed in claim 9 is characterized in that, exports said vertical synchronizing signal and comprises the following steps:
S330 judges whether to sense the positive edge of composite synchronizing signal, in this way, and execution in step S340, otherwise execution in step S370;
S340, counter make zero and begin counting;
S350 judges whether the gate time of said counter arrives the positive pulse threshold value, execution in step S360 in this way, otherwise, return step S330;
S360 enables vertical synchronizing signal, and returns step S330; S370 judges whether to sense the negative edge of composite synchronizing signal, in this way, and execution in step S380, otherwise, return step S330;
S380, counter make zero and begin counting;
S390 judges whether the gate time of said counter arrives the negative pulse threshold value, execution in step S395 in this way, otherwise, return step S330;
S395 is the vertical synchronizing signal forbidden energy, and returns step S330.
12. vertical synchronizing signal separation method as claimed in claim 9 is characterized in that, said method further comprises:
When said maximum negative pulse duration equals said time big positive pulse width and said big positive pulse width less than said big negative pulse width greater than said maximum positive pulse width, said maximum positive pulse width, set that said negative pulse threshold value is slightly larger than and near said big negative pulse width.
13. vertical synchronizing signal separation method as claimed in claim 12; It is characterized in that, the standard of wherein said composite synchronizing signal be 720p25 standard, 720p24 standard, 720p23 standard, SERR, H EOR V, SERR0.5H standard and H+V standard one of them.
14. vertical synchronizing signal separation method as claimed in claim 9 is characterized in that, said method further comprises:
Test constantly and upgrade the said maximum positive pulse width of said composite synchronizing signal, said time big positive pulse width, said maximum negative pulse duration and said big negative pulse width is with said positive pulse threshold value of dynamic adjustment and said negative pulse threshold value.
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| JP特开2000-138842A 2000.05.16 |
| JP特开2003-069855A 2003.03.07 |
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| CN102158634A (en) | 2011-08-17 |
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