CN105933574B - It goes in video, the separation system of field sync signal - Google Patents
It goes in video, the separation system of field sync signal Download PDFInfo
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- CN105933574B CN105933574B CN201610341472.2A CN201610341472A CN105933574B CN 105933574 B CN105933574 B CN 105933574B CN 201610341472 A CN201610341472 A CN 201610341472A CN 105933574 B CN105933574 B CN 105933574B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
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- Synchronizing For Television (AREA)
Abstract
The invention discloses separation systems capable, field sync signal in video, belong to from picture signal and separate synchronization signal technical field.System includes the low-pass filter, bandpass filter and inverter circuit being made of respectively separating component, the input terminal of the output end connection bandpass filter of low-pass filter, the output end of bandpass filter and the input terminal of phase inverter connect, vision signal enters from the input terminal of the low-pass filter, the output end of low-pass filter exports line synchronising signal, and the output end of phase inverter exports field sync signal.The functional module of this system is made of discrete component, has low cost, low-power consumption, system is reliable, the stable advantage of performance.
Description
Technical field
The present invention relates to synchronization signal technical field is separated from picture signal, together more particularly to a kind of trip of low-cost separation
Walk the technology of signal and field sync signal.
Background technique
In the signal (frequency is in 0~8MHz) of camera acquisition other than having line synchronising signal and field sync signal, also
Including horizontal blanking signal, field blanking signal, composite blanking signal and picture signal.Line synchronising signal is also known as " horizontal sweep
Frequency " refers to electron gun scanned horizontal line quantity on fluorescent screen per second, is equal to " vertical resolution x field frequency " (picture refreshing
Number), frequency is probably in 50KHz or so.Field sync signal is also known as " vertical scanning frequency ", refers to time of screen-refresh each second
Number, with Hz (hertz) for unit, frequency is in 50Hz~85Hz.
It generally requires first to isolate both vision signals when handling vision signal, in the prior art generally by using special
The chip of door isolates line synchronising signal and field sync signal from vision signal.If notification number is CN102025890B, title
For the patent and Publication No. CN104243931A, entitled of the method and system of video line synchronization signal " a kind of restore " "
A method of the video acquisition display system based on ARM camera interface " is all to use sync separator i.e. specialized chip.But
Be this specialized chip price it is more expensive, and power consumption is also very big, in the epoch for advocating environmental protection, low energy consumption development, urgently
Need to develop the video separation circuit of a low-power consumption as an alternative.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of low cost, easy to accomplish isolated from vision signal
The separation system of row, field sync signal.
To solve the above problems, solution of the invention is to provide the segregative line of row in a kind of video, field sync signal
System comprising low-pass filter, bandpass filter and the inverter circuit being made of respectively separating component, low-pass filter
Output end connects the input terminal of bandpass filter, and the output end of bandpass filter and the input terminal of phase inverter connect, vision signal
Enter from the input terminal of the low-pass filter, the output end of low-pass filter exports line synchronising signal, the output end of phase inverter
Export field sync signal.
Aforementioned low-pass filter includes a PNP transistor, and vision signal enters from the input terminal of the low-pass filter,
It is divided into three tunnels, one is connected to first resistor R1 and arrives ground again, remaining two tunnel is separately connected first capacitor C1, the second capacitor C2, the
One capacitor C1 reaches the base stage of PNP transistor after the second resistance R2 that connects, then after drawing a 4th resistance R4 from the base stage
Ground connection, the second capacitor C2 are connected by series connection 3rd resistor R3 with the emitter of PNP transistor, and emitter connects VCC, PNP crystal
The collector of pipe meets the 5th resistance R5 to ground, and line synchronising signal is exported from the collector of PNP transistor.
Aforementioned bandpass filter includes a NPN transistor, and the output signal of the low-pass filter is via third capacitor
C3 enters, and connects the base stage of NPN transistor, and the 6th resistance R6 connects the base stage to VCC, and the base stage is simultaneously also through the 7th resistance R7
To ground, the emitter of NPN transistor meets the 9th resistance R9 and arrives ground again, and the collector of NPN transistor meets the 8th resistance R8 and arrives again
One the 4th capacitor C4 of parallel connection again on VCC, the 8th resistance R8.
In aforementioned inverter circuit, the output signal of the bandpass filter enters via the 5th capacitor C5, and connection NPN is brilliant
The base stage of body pipe, the tenth resistance R10 connect the base stage to VCC, and the base stage is simultaneously also through eleventh resistor R11 to ground, NPN crystal
The emitter of pipe meets thirteenth resistor R13 and arrives ground again, and the collector of NPN transistor meets twelfth resistor R12 and arrives VCC, current collection again
The 6th capacitor C6 ground connection in parallel, field sync signal are exported from the 7th capacitor C7 other end connecting with collector again for pole.
The utility model has the advantages that compared with prior art, the present invention has the following prominent advantages:
1, low in energy consumption: the circuit system structure of system is simple in the present invention, and component is simple, belongs to low energy-consumption electronic device,
Main element is transistor 9012 and 9011, they are 3V in operating voltage, so operating current is very low, is finally made entire
The lower power consumption of system.
2, at low cost: the cost at low cost for being mainly reflected in component used in this system, circuit system main element
It is a transistor 9012, two transistors 9011 and several passive elements (resistance and capacitor), these elements
Price it is all very low, so the cost of whole system is relatively very low.
3, system is reliable, and performance is stablized, and works well, and this circuit system being made of discrete component is simple, easy
Operation.
Detailed description of the invention
Fig. 1 is the schematic diagram that line synchronising signal is isolated from the vision signal that camera acquires.
Fig. 2 is the emulation Bode diagram for separating line synchronising signal.
Fig. 3 is the schematic diagram that field sync signal is isolated from vision signal.
Fig. 4 is the emulation Bode diagram for separating field sync signal.
Fig. 5 is the complete schematic digram that trip, field sync signal are separated from the vision signal that camera acquires.
Specific embodiment
Specific implementation of the invention is further described in detail now in conjunction with attached drawing.
A specific embodiment is provided below:
In the present embodiment, three mainly are respectively constituted solely with a PNP triode 9012 and two NPN triodes 9011
Vertical circuit, then configure what some capacitance resistances were formed by auxiliary.The shown of Fig. 1 and Fig. 3 is low-pass filter, band logical filter respectively
Wave device and phase inverter.Main component mainly includes PNP triode 9012 in figure, there are also different resistance values for NPN triode 9011
Resistance and different capabilities capacitor.
In Fig. 1, the main function for the low-pass filter that PNP pipe 9012 is constituted is that line synchronising signal is acquired from camera
It is separated in vision signal, Fig. 2 is that a frequency is 50KHz, and gain is the emulation baud of the low-pass filter of 20.76dB
Scheme, two 9011 in Fig. 3 are respectively formed bandpass filter and phase inverter, thus the field sync signal separated, Fig. 4 is one
A centre frequency is 50Hz, and gain is the emulation Bode diagram of the bandpass filter of 20.00dB.
Video synchronization signal is from video inputs input circuit, by the impedance matching resistor of 75 Ω R1, enter C1,
Synchronization line signal is formed in the differential circuit (when ac equivalent circuit) that R2, R4 are constituted, thus loading synchronous separating transistor
In 9012 base stage, the lock-out pulse part born in signal at this time makes 9012 conductings and works in magnifying state, then in crystal
The synchronization pulse being exaggerated on the collector load R5 of pipe 9012.Shi Rutu base stage arrow is connected in triode 9012
It is shown, this current direction capacitor C2 charging, charging polarity be L-R+, charging voltage value e2.The size of e2 is almost and together
The peak value e1 of pace pulse is equal, and the charging voltage of C2, which is equivalent to the emitter junction of triode 9012, has added a reverse biased, institute
With the cut-off of transistor 9012 (because amplitude that the amplitude of vision signal is less than synchronization signal) after synchronization signal.In transistor
During 9012 cut-offs, the charging voltage of C2 will be discharged by R4.Since the resistance value of R4 is greater than the resistance value of R3, so the speed of electric discharge
Can be slow, transistor 9012 is always maintained at off state until next pulse arrives.When next pulse arrives,
The peak value e1 of lock-out pulse makes the conducting of triode 9012 in magnifying state again, and C2 is filled with electricity, above process week again again
And renewing i.e. transistor 9012 is the conducting when the peak value of synchronization signal reaches, and other moment are in off state, with
This obtains line synchronising signal to reach amplitude separation.
The signal come out from 9012 rear ends is the vision signal of 0-50KHz, by C3 (blocking) capacitor, is filtered off therein straight
Flow component (provides the DC quantity of quiescent point), is then sent through in two composition bandpass filters of NPN triodes 9011 and obtains field
Synchronization signal.(this circuit can not only be steady using partial pressure type DC current negative-feedback biasing circuit for first triode 9011
Determine the input current and current potential and when extraneous circumstance changes of base stage, the R9 feedback mechanism introduced in circuit, Neng Gouji
When overcome the drift of quiescent point Q, so that circuit be made to reach stable state), R6, R7 provide static as divider resistance
Operating point, and the small resistance of R9 carrys out stabilizing circuit as feedback resistance, signal passes through 9011 amplifying circuit of triode, using R8,
The integrating circuit of C4 composition obtains field sync signal, and entering back into the reverse amplification circuit of U3, (quiescent point is not as U2
Can change with the change of environment) in, finally the field sync signal that DC component obtains AC signal is filtered out by capacitor C7.
As shown in figure 5, the collected vision signal of camera is input in circuit from the video inputs of the left end R1, pass through
The line synchronising signal that the low-pass filter circuit constituted centered on 9012 has isolated frequency as 50KHz or so is crossed, after 9012
The vision signal that the signal come is 0-50KHz is brought out, by C3 (blocking) capacitor, DC component therein is filtered off and (provides static
The DC quantity of operating point), it is then sent through in two composition bandpass filters of NPN triodes 9011 and obtains field sync signal.First
Using partial pressure type DC current negative-feedback biasing circuit, (this circuit can not only stablize the input current of base stage to triode 9011
With current potential and when extraneous circumstance changes, the R9 feedback mechanism introduced in circuit can timely overcome quiescent operation
The drift of point Q, so that circuit be made to reach stable state), R6, R7 provide quiescent point, and the small electricity of R9 as divider resistance
Resistance carrys out stabilizing circuit as feedback resistance, and signal passes through 9011 amplifying circuit of triode, the integrating circuit formed using R8, C4
Field sync signal is obtained, entering back into the reverse amplification circuit of U3, (quiescent point will not change with the change of environment as U2
Become) in, finally the field sync signal that DC component obtains AC signal is filtered out by capacitor C7.
It should be noted that be not intended to limit the invention the foregoing is merely a specific embodiment of the invention, this
Circuit diagram used in embodiment is only limitted to the present embodiment, all within the spirits and principles of the present invention, made any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (1)
1. going in video, the separation system of field sync signal, it is characterised in that: including the low pass being made of respectively separating component
Filter, bandpass filter and inverter circuit, the input terminal of the output end connection bandpass filter of low-pass filter, band logical filter
The output end of wave device and the input terminal of phase inverter connect, and vision signal enters from the input terminal of the low-pass filter, low pass filtered
The output end of wave device exports line synchronising signal, and the output end of phase inverter exports field sync signal；
Low-pass filter circuit is by a PNP transistor 9012 and resistance R1, R2, R3, R4, R5, capacitor C1, C2 composition: wherein
The effect of R1, C1 are filtering, and the effect of R3, C2 branch is broadened bandwidth, and R2, R4 are partial pressures, and R5 is load resistance；Vision signal
Enter from the input terminal of the low-pass filter, be divided into three tunnels, one is connected to first resistor R1 and arrives ground, remaining two tunnel difference again
First capacitor C1, the second capacitor C2 are connected, first capacitor C1 reaches the base stage of PNP transistor after the second resistance R2 that connects,
It is grounded after drawing a 4th resistance R4 from the base stage again, the second capacitor C2 passes through the hair of series connection 3rd resistor R3 and PNP transistor
Emitter-base bandgap grading is connected, and emitter meets VCC, the collector of PNP transistor connect the 5th resistance R5 to, line synchronising signal is from PNP transistor
Collector output；
Bandpass filter is by a NPN transistor 9011 and resistance R6, R7, R8, R9, capacitor C3, C4 composition；The low-pass filtering
The output signal of device enters via third capacitor C3, connects the base stage of NPN transistor, and the 6th resistance R6 connects the base stage to VCC,
The base stage is simultaneously also through the 7th resistance R7 to ground, and the emitter of NPN transistor meets the 9th resistance R9 and arrives ground again, NPN transistor
Collector meets the 8th resistance R8 and arrives VCC again, one the 4th capacitor C4 of parallel connection again on the 8th resistance R8；
For inverter circuit by a NPN transistor 9011 and resistance R10, R11, R12, R13, capacitor C5, C6, C7 composition are described
The effect of capacitor C3, C5, C7 are that the flip-flop of every grade of circuit signal is isolated, and resistance R6, R7 constitute first 9011 crystal
The biasing circuit of divided voltage of pipe, establishes the base stage DC offset voltage of transistor 9011, and R8 and shunt capacitance C4 mono- work filter
Except high-frequency noise, R9 emitter generates emitter current with being connected to, and resistance R10, R11 constitute second 9011 crystal
The biasing circuit of divided voltage of pipe establishes the base stage DC offset voltage of transistor 9011, and resistance R12 and C6 constitute filter circuit,
R13 emitter generates emitter current with being connected to, the output signal of the bandpass filter via the 5th capacitor C5 into
Enter, connect the base stage of NPN transistor, the tenth resistance R10 connects the base stage to VCC, and the base stage is simultaneously also through eleventh resistor R11
To ground, the emitter of NPN transistor meets thirteenth resistor R13 and arrives ground again, and the collector of NPN transistor meets twelfth resistor R12
VCC is arrived again, and the 6th capacitor C6 ground connection in parallel, field sync signal are another from the 7th capacitor C7 connecting with collector again for collector
One end output.
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| CN201610341472.2A CN105933574B (en) | 2016-05-20 | 2016-05-20 | It goes in video, the separation system of field sync signal |
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| CN201610341472.2A CN105933574B (en) | 2016-05-20 | 2016-05-20 | It goes in video, the separation system of field sync signal |
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| CN105933574A CN105933574A (en) | 2016-09-07 |
| CN105933574B true CN105933574B (en) | 2019-05-21 |
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| JPH08331416A (en) * | 1995-05-29 | 1996-12-13 | Casio Comput Co Ltd | Pll circuit and image display device using the same |
| CN1774036A (en) * | 2004-10-05 | 2006-05-17 | 三洋电机株式会社 | Video signal processing circuit |
| CN201247576Y (en) * | 2008-08-25 | 2009-05-27 | 广州视声电子科技有限公司 | Drive circuit for flat black and white display |
| CN201754598U (en) * | 2009-07-27 | 2011-03-02 | 常州市明景电子有限公司 | Synchronizing separator circuit |
| CN102025894A (en) * | 2010-12-25 | 2011-04-20 | 广东威创视讯科技股份有限公司 | Synchronizing signal distortion correcting circuit of video signal |
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| CN102339594A (en) * | 2010-07-26 | 2012-02-01 | 国基电子（上海）有限公司 | Multimedia equipment |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08331416A (en) * | 1995-05-29 | 1996-12-13 | Casio Comput Co Ltd | Pll circuit and image display device using the same |
| CN1774036A (en) * | 2004-10-05 | 2006-05-17 | 三洋电机株式会社 | Video signal processing circuit |
| CN201247576Y (en) * | 2008-08-25 | 2009-05-27 | 广州视声电子科技有限公司 | Drive circuit for flat black and white display |
| CN201754598U (en) * | 2009-07-27 | 2011-03-02 | 常州市明景电子有限公司 | Synchronizing separator circuit |
| CN102025890A (en) * | 2009-09-22 | 2011-04-20 | 康佳集团股份有限公司 | Method and system for restoring video line synchronizing signal |
| CN102339594A (en) * | 2010-07-26 | 2012-02-01 | 国基电子（上海）有限公司 | Multimedia equipment |
| CN102025894A (en) * | 2010-12-25 | 2011-04-20 | 广东威创视讯科技股份有限公司 | Synchronizing signal distortion correcting circuit of video signal |
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| Title |
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| RC电路在电视机电路中的应用分析;孙大春;《吉林工程技术师范学院学报》;20030615;第19卷(第6期);53-55 |
| 一种高清视频同步分离器的设计;宁静;《湖北民族学院学报(自然科学版)》;20110620;第29卷(第2期);201-203 |
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