CN108093193A - A kind of video formats switching method and device - Google Patents
A kind of video formats switching method and device Download PDFInfo
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- CN108093193A CN108093193A CN201711464978.3A CN201711464978A CN108093193A CN 108093193 A CN108093193 A CN 108093193A CN 201711464978 A CN201711464978 A CN 201711464978A CN 108093193 A CN108093193 A CN 108093193A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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Abstract
The invention discloses a kind of video formats switching method and devices, this method is converted to electric signal by the optical signal for sending the electric lighting of reception, and detection signal is determined according to electric signal, synchronization pulse is determined according to preset reference signal and detection signal, then the frequency of synchronization pulse is calculated, since the frequency of synchronization pulse has correspondence with video formats, therefore can video formats switching be carried out according to the frequency of synchronization pulse, so as to avoid due to the problem of influencing video playing quality caused by user's selection video formats mistake.
Description
Technical field
The present invention relates to technical field of video processing more particularly to a kind of video formats switching methods and device.
Background technology
In field of video monitoring, SD analog video usually has line-by-line inversion (Phase Alteration Line, PAL)
With two kinds of standards of National Television Standards Committee (National Television System Committee, NTSC), this two
Kind standard cannot be compatible, if selecting or selecting on an electronic device the video of NTSC system formula broadcasting pal mode,
So picture will become black and white.Therefore electronic equipment when playing video, it is necessary to make the standard selected on electronic equipment with want
The standard of the video of broadcasting is identical.
General electronic equipment can support the broadcasting of both standard videos of PAL and NTSC, but user is using
, it is necessary to which user understands the relevant knowledge of video formats during electronic equipment, so as to select video formats on an electronic device, that is, need
User voluntarily configures video formats, can not accomplish adaptively, thus to cause the inconvenient for use of user, and if user selects
Mistake is selected, the play quality of video will be influenced.
Therefore it provides a kind of solution adaptively switched that can realize video formats is asking for current urgent need to resolve
Topic.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of video formats switching method and device, to solve due to user
Caused by selecting video formats mistake the problem of influence video playing quality.
Therefore, a kind of video formats switching method provided in an embodiment of the present invention, including：
The optical signal that electric lighting is sent is received, and the optical signal is converted into electric signal；
Detection signal is determined according to the electric signal；
Synchronization pulse is determined according to preset reference signal and the detection signal；
Calculate the frequency of the synchronization pulse；
Video formats switching is carried out according to the frequency of the synchronization pulse.
It is preferred that when it is implemented, in the above method provided in an embodiment of the present invention, it is described true according to the electric signal
Regular inspection surveys signal, specifically includes：
Direct current biasing and enhanced processing are gone to the electric signal, determine the detection signal.
It is preferred that when it is implemented, in the above method provided in an embodiment of the present invention, it is described according to preset reference signal
Synchronization pulse is determined with the detection signal, is specifically included：
The corresponding detection voltage of detection signal predetermined reference voltage corresponding with the preset reference signal is carried out
Compare, the pulse signal of high level is exported when the detection voltage is less than the predetermined reference voltage, when the detection voltage
Low level pulse signal is exported during more than or equal to the predetermined reference voltage, is believed according to the pulse of the high level of output
Number with the low level pulse signal determine the synchronization pulse.
Correspondingly, the embodiment of the present invention additionally provides a kind of video formats switching device, and described device includes：
The optical signal for receiving the optical signal that electric lighting is sent, and is converted to electric signal by photoelectric conversion module；
First determining module, for determining detection signal according to the electric signal；
Second determining module, for determining synchronization pulse according to preset reference signal and the detection signal；
Computing module, for calculating the frequency of the synchronization pulse；
Handover module, for carrying out video formats switching according to the frequency of the synchronization pulse.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, the photoelectric conversion module bag
It includes：Phototriode；The collector of the phototriode is connected with the first power end, the emitter of the phototriode with
First determining module is connected, and the base stage of the phototriode is used to receive the optical signal.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, first determining module is specific
For removing direct current biasing and enhanced processing to the electric signal, the detection signal is determined.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, the first determining module bag
It includes：First resistor, the first amplifier, the first capacitance, second resistance, 3rd resistor, the 4th resistance, the second amplifier；Wherein,
The normal phase input end of first amplifier is connected with the photoelectric conversion module, for receiving the electric signal,
The output terminal of first amplifier respectively with the negative-phase input of first amplifier and first capacitance first
End is connected；
The first end of the first resistor is connected with the normal phase input end of first amplifier, and the of the first resistor
Two ends are grounded；
The second end of first capacitance is connected with the first end of the second resistance；
The second end of the second resistance respectively with the first end of the 3rd resistor and the negative of second amplifier
Input terminal is connected, and the normal phase input end of second amplifier is connected with the first end of the 4th resistance, the 4th resistance
Second end ground connection, the output terminal of second amplifier determines mould with the second end of the 3rd resistor and described second respectively
Block is connected, for exporting the detection signal.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, second determining module has
Body is used to compare the corresponding detection voltage of detection signal predetermined reference voltage corresponding with the preset reference signal
Compared with when the pulse signal for detecting output high level when voltage is less than the predetermined reference voltage, when the detection voltage is big
Low level pulse signal is exported when the predetermined reference voltage, according to the pulse signal of the high level of output
The synchronization pulse is determined with the low level pulse signal.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, the second determining module bag
It includes：Comparator, the 5th resistance and the 6th resistance；Wherein,
The negative-phase input of the comparator is connected with the output terminal of first determining module, for receiving the detection
Signal, the normal phase input end of the comparator respectively with the first end of the 5th resistance and the first end phase of the 6th resistance
Even, the second end of the 5th resistance is connected with second source end, the second end ground connection of the 6th resistance, the comparator
Output terminal is connected with the computing module, for exporting the synchronization pulse.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, the computing module includes counting
Device；The input terminal of the counter is used to receive the synchronization pulse, the output terminal of the counter and the switching mould
Block is connected, for exporting the frequency of the synchronization pulse.
It is preferred that when it is implemented, in above device provided in an embodiment of the present invention, the handover module includes processing
Device；The input terminal of the processor is connected with the output terminal of the counter, for receiving the frequency of the synchronization pulse
Carry out video formats switching.
The invention discloses a kind of video formats switching method and device, this method is by the way that the electric lighting of reception is sent
Optical signal be converted to electric signal, and detection signal is determined according to electric signal, is determined according to preset reference signal with detecting signal
Then synchronization pulse calculates the frequency of synchronization pulse, since frequency and the video formats of synchronization pulse have pair
It should be related to, therefore can video formats switching be carried out according to the frequency of synchronization pulse, be selected so as to avoid due to user
The problem of video playing quality is influenced caused by video formats mistake.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of flow diagram of video formats switching method provided in an embodiment of the present invention；
Fig. 2 is a kind of one of structure diagram of video formats switching device provided in an embodiment of the present invention；
Fig. 3 is a kind of second structural representation of video formats switching device provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail, it is clear that described embodiment is only this
The a part of embodiment of invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
The all other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of video formats switching method provided in an embodiment of the present invention, as shown in Figure 1, including：
S101, the optical signal that electric lighting is sent is received, and converts optical signals to electric signal；
It should be noted that electric lighting refers to the device for converting electrical energy into light.Electric lighting presses principle of luminosity at present
Incandescent lamp (referring to the lamp to shine due to electric current is by making tungsten filament white heat) can be divided into, gas-discharge lamp (refers to electric current and passes through lamp both ends
Electrode forms gas discharge and generates the lamp of light) and LED light lamp.Electric lighting in the present invention is primarily referred to as incandescent lamp.
Video formats switching method provided in an embodiment of the present invention is applied to electronic equipment, and electronic equipment includes PC, intelligence
The equipment such as TV and mobile phone.
The present invention by a kind of electrooptical device phototriode have electric lighting illumination in the environment of, illumination to light
When in the P-N junction of quick triode, phototriode can induce periodically bright variation, and the base stage of phototriode absorbs light
It can and be changed into electric energy, will periodically light change modulates turn the optical signal of reception into AC signal, i.e. phototriode
It is changed to electric signal.
S102, detection signal is determined according to electric signal；
Since the environment that is illuminated in electric lighting also has the light source of other direct current signals, such as DC power supply driving
Light or faint daylight, the then signal reflected in electric signal (AC signal) are the exchange letters containing direct current signal
Number, that is, contain noise signal, therefore by that by removal direct current signal and signal enhanced processing, can consider and remove the electric signal
Noise signal so as to obtain the accurate synchronization pulse of frequency, and then improves the accuracy that video formats are adjusted.
S103, synchronization pulse is determined according to preset reference signal and detection signal；
The present invention by will detect signal corresponding with the preset reference signal predetermined reference voltage of corresponding detection voltage into
Row compares, and the pulse signal of high level is exported when detection voltage is less than predetermined reference voltage, when detection voltage is greater than or equal to
Low level pulse signal is exported during predetermined reference voltage, is believed according to the pulse signal of the high level of output and low level pulse
Number definite synchronization pulse.
S104, the frequency for calculating synchronization pulse；
The present invention receives synchronization pulse by counter and calculates the frequency of synchronization pulse, such as counter
By calculating the frequency of synchronization pulse according to generated pulse number in the unit interval (such as 1 second).
S105, video formats switching is carried out according to the frequency of synchronization pulse.
The frequency of the definite synchronization pulse of basis and the frequency and the correspondence of video formats that pre-save first,
Determine target video standard；Then according to definite target video standard, the video formats that itself is supported is switched to target and are regarded
Frequency standard.For example, the frequency of the synchronization pulse pre-saved in electronic equipment is synchronous with the correspondence of video formats
The frequency of pulse signal is 50Hz, and corresponding video formats are pal mode；The frequency of synchronization pulse is 60Hz, corresponding
Video formats are NTSC system formula.If the frequency of the synchronization pulse obtained is 50Hz, according to the synchronous arteries and veins pre-saved
The frequency of signal and the correspondence of video formats are rushed, it is pal mode to determine target video standard；If the lock-out pulse obtained
The frequency of signal is 60Hz, then according to the frequency of synchronization pulse and the correspondence of video formats pre-saved, determines
Target video standard is NTSC system formula.Electronic equipment is to support pal mode and NTSC system formula both standards simultaneously, is being determined
After target video standard, the video formats that itself is supported can be switched to target video standard by electronic equipment, i.e. if it is determined that
Target video standard for pal mode, the video formats that itself is supported are switched to pal mode by electronic equipment；If it is determined that
Target video standard is NTSC system formula, and the video formats that itself is supported are switched to NTSC system formula by electronic equipment.Since electronics is set
The video formats of standby switching are the frequency of the definite synchronization pulse of basis and the frequency and pair of video formats that pre-save
It should be related to, the target video standard determined, therefore the video formats of electronic equipment switching are the synchronization pulse with acquisition
The corresponding video formats of frequency, therefore can electronic equipment switch video formats under, normal play video.
Above-mentioned video formats switching method disclosed by the invention is converted by the optical signal for sending the electric lighting of reception
For electric signal, and detection signal is determined according to electric signal, synchronization pulse is determined according to preset reference signal and detection signal,
Then the frequency of synchronization pulse is calculated, it, can since frequency and the video formats of synchronization pulse have correspondence
To carry out video formats switching according to the frequency of synchronization pulse, so as to avoid due to user video formats mistake is selected to lead
The problem of influence video playing quality of cause.
Further, when it is implemented, in the above method provided in an embodiment of the present invention, determine to detect according to electric signal
Signal specifically includes：
Direct current biasing and enhanced processing are gone to electric signal, determines detection signal.This is because in the ring of electric lighting illumination
There are the light source of other direct current signals, such as the light of DC power supply driving or faint daylight around border, then electric signal
In the signal that reflects be the AC signal containing direct current signal, by the signal by removal direct current signal and amplification at
Reason, can obtain the accurate synchronization pulse of frequency, so as to improve the accuracy of video formats adjusting.
Further, when it is implemented, in the above method provided in an embodiment of the present invention, according to preset reference signal with
Detection signal determines synchronization pulse, specifically includes：
Compared with the corresponding detection voltage of signal predetermined reference voltage corresponding with reference signal will be detected, when detection electricity
Pressure be less than predetermined reference voltage when export high level pulse signal, when detect voltage be greater than or equal to predetermined reference voltage when it is defeated
Go out low level pulse signal, determine that lock-out pulse is believed according to the pulse signal of the high level of output and low level pulse signal
Number.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of video formats switching device, as shown in Fig. 2,
The device includes：
Photoelectric conversion module 01 for receiving the optical signal that electric lighting is sent, and converts optical signals to electric signal；
First determining module 02, for determining detection signal according to electric signal；
Second determining module 03, for determining synchronization pulse according to preset reference signal and detection signal；
Computing module 04, for calculating the frequency of synchronization pulse；
Handover module 05, for carrying out video formats switching according to the frequency of synchronization pulse.
Further, when it is implemented, in above device provided in an embodiment of the present invention, as shown in figure 3, opto-electronic conversion
Module 01 includes：Phototriode Q；The collector of phototriode Q is connected with the first power end VCC1, phototriode Q's
Emitter is connected with the first determining module 02, and the base stage of phototriode Q is used to receive the optical signal that electric lighting is sent.It is photosensitive
The optical signal that the base stage inductive lightning electric appliance of triode Q is sent, converts optical signals to electric signal output to the first determining module
02。
Further, when it is implemented, in above device provided in an embodiment of the present invention, the first determining module is specifically used
In going direct current biasing and enhanced processing to electric signal, detection signal is determined.This is because around the environment of electric lighting illumination
The light source of also other direct current signals, such as the light of DC power supply driving or faint daylight, then reflect in electric signal
The signal come is the AC signal containing direct current signal, by the signal by removal direct current signal and enhanced processing, can be obtained
To the accurate synchronization pulse of frequency, so as to improve the accuracy of video formats adjusting.
Further, when it is implemented, in above device provided in an embodiment of the present invention, as shown in figure 3, first determines
Module 02 includes：First resistor R1, the first amplifier U1, the first capacitance C1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the second amplifier U2；Wherein,
The normal phase input end of first amplifier U1+be connected with photoelectric conversion module 01, for receiving electric signal；First amplification
First end of the output terminal of device U1 respectively with the negative-phase input-of the first amplifier U1 and the first capacitance C1 is connected；
The normal phase input end of the first end of first resistor R1 and the first amplifier U1+be connected, the second end of first resistor R1
Ground connection；
The second end of first capacitance C1 is connected with the first end of second resistance R2；
The second end of second resistance R2 respectively with the negative-phase input of the first end of 3rd resistor R3 and the second amplifier U2-
It is connected, the normal phase input end of the second amplifier U2+be connected with the first end of the 4th resistance R4, the second of the 4th resistance R4 terminates
Ground, the output terminal of the second amplifier U2 is connected respectively with the second end of 3rd resistor R3 and the second determining module 03, for exporting
Detect signal.That is electric signal removes direct current signal after the first amplifier U1, by the first capacitance C1, using the second amplification
Device U2 carries out signal and amplifies to obtain detection signal, so as to detect signal output to the second determining module 03.
Further, when it is implemented, in above device provided in an embodiment of the present invention, the second determining module, specifically
For it will detect the corresponding detection voltage of signal predetermined reference voltage corresponding with preset reference signal compared with, when detection electricity
Pressure be less than predetermined reference voltage when export high level pulse signal, when detect voltage be greater than or equal to predetermined reference voltage when it is defeated
Go out low level pulse signal, determine that lock-out pulse is believed according to the pulse signal of the high level of output and low level pulse signal
Number.
Further, when it is implemented, in above device provided in an embodiment of the present invention, as shown in figure 3, second determines
Module 03 includes：Comparator U, the 5th resistance R5 and the 6th resistance R6；Wherein,
The negative-phase input of comparator U-be connected with the output terminal of the first determining module 02 detects signal for receiving, than
Normal phase input end+first end respectively with the first end of the 5th resistance R5 and the 6th resistance R6 compared with device U is connected, the 5th resistance R5
Second end be connected with second source end VCC2, the second end of the 6th resistance R6 ground connection, the output terminal and computing module of comparator U
04 is connected, for output sync pulse signal.Will detect corresponding detection voltage and the predetermined reference voltage of signal (VCC2 ×
R6)/(R5+R6) is compared, and high level is exported when detection voltage is less than predetermined reference voltage (VCC2 × R6)/(R5+R6)
Pulse signal, when detect voltage be greater than or equal to predetermined reference voltage (VCC2 × R6)/(R5+R6) when export low level arteries and veins
Signal is rushed, synchronization pulse is determined according to the pulse signal of the high level of output and low level pulse signal.
Further, when it is implemented, in above device provided in an embodiment of the present invention, as shown in figure 3, computing module
04 includes counter 041；The input terminal of counter 041 is used to receive synchronization pulse, the output terminal of counter 041 and switching
Module 05 is connected, for the frequency of output sync pulse signal.Counter 041 according in the unit interval (such as 1 second) by producing
Raw pulse number calculates the frequency of synchronization pulse.
Further, when it is implemented, in above device provided in an embodiment of the present invention, as shown in figure 3, handover module
05 includes processor 051；The input terminal of processor 051 is connected with the output terminal of counter 041, for receiving synchronization pulse
Frequency carry out video formats switching.For example, processor is according to the frequency of the synchronization pulse of reception and the frequency pre-saved
The correspondence of rate and video formats determines target video standard；Then according to definite target video standard, itself is supported
Video formats be switched to target video standard.For example, the frequency and video of the synchronization pulse pre-saved in processor
The correspondence of standard is that the frequency of synchronization pulse is 50Hz, and corresponding video formats are pal mode；Synchronization pulse
Frequency for 60Hz, corresponding video formats are NTSC system formula.If the frequency for the synchronization pulse that processor obtains is
50Hz then according to the frequency of synchronization pulse and the correspondence of video formats pre-saved, determines target video standard
For pal mode；If the frequency for the synchronization pulse that processor obtains is 60Hz, according to the lock-out pulse letter pre-saved
Number frequency and video formats correspondence, determine target video standard be NTSC system formula.Electronic equipment is to support PAL simultaneously
Standard and NTSC system formula both standards, after definite target video standard, the processor of electronic equipment can prop up itself
The video formats held are switched to target video standard, i.e. if it is determined that target video standard for pal mode, electronic equipment
The video formats that itself is supported are switched to pal mode by processor；If it is determined that target video standard for NTSC system formula, electronics
The video formats that itself is supported are switched to NTSC system formula by the processor of equipment.The video switched due to the processor of electronic equipment
Standard is the frequency of the definite synchronization pulse of basis and the frequency and the correspondence of video formats that pre-save, is determined
Target video standard, therefore the video formats of the processor switching of electronic equipment are frequency with the synchronization pulse of acquisition
Corresponding video formats, thus can processor switching video formats under, normal play video.
With reference to Fig. 3 by specific embodiment come the work to video formats switching device provided in an embodiment of the present invention
Principle is described in detail：
In the place for having electric lighting to illuminate, the base stage sensing optical signal of phototriode Q, then phototriode Q will
Optical signal is converted into electric signal, which is amplified after the first amplifier U1, after the first capacitance C1, in electric signal
Comprising direct current signal be removed, remove the electric signal of direct current signal after the second amplifier U2, be exaggerated (1+R3/R2)
Multiple, the electric signal being amplified detect signal output to the negative-phase input of comparator U, the preset reference with normal phase input end
Voltage (VCC2 × R6)/(R5+R6) is compared, and predetermined reference voltage (VCC2 × R6)/(R5+R6) is a fixed voltage
Value, due to the corresponding detection voltage of detection signal, generating period changes at any time, when detection voltage is less than predetermined reference voltage
During (VCC2 × R6)/(R5+R6), then the pulse signal of high level is exported, when detection voltage is greater than or equal to predetermined reference voltage
During (VCC2 × R6)/(R5+R6), then low level pulse signal is exported, the pulse signal of the high level of output and low level
Pulse signal is definite synchronization pulse, which exports to counter 041, and counter 041 calculates should
The frequency of synchronization pulse, by the rate-adaptive pacemaker for the synchronization pulse being calculated to processor 051, processor 051
Frequency and the frequency and the correspondence of video formats that pre-save according to the synchronization pulse, determine target video standard；
Then according to definite target video standard, the video formats that itself is supported are switched to target video standard.
The invention discloses a kind of video formats switching method and device, this method is by the way that the electric lighting of reception is sent
Optical signal be converted to electric signal, and detection signal is determined according to electric signal, is determined according to preset reference signal with detecting signal
Then synchronization pulse calculates the frequency of synchronization pulse, since frequency and the video formats of synchronization pulse have pair
It should be related to, therefore can video formats switching be carried out according to the frequency of synchronization pulse, be selected so as to avoid due to user
The problem of video playing quality is influenced caused by video formats mistake.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and scope.In this way, if these modifications and changes of the present invention belongs to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these modification and variations.
Claims (11)
1. a kind of video formats switching method, which is characterized in that including：
The optical signal that electric lighting is sent is received, and the optical signal is converted into electric signal；
Detection signal is determined according to the electric signal；
Synchronization pulse is determined according to preset reference signal and the detection signal；
Calculate the frequency of the synchronization pulse；
Video formats switching is carried out according to the frequency of the synchronization pulse.
2. the method as described in claim 1, which is characterized in that it is described that detection signal is determined according to the electric signal, it is specific to wrap
It includes：
Direct current biasing and enhanced processing are gone to the electric signal, determine the detection signal.
3. the method as described in claim 1, which is characterized in that described to be determined according to preset reference signal and the detection signal
Synchronization pulse specifically includes：
Compared with by the corresponding detection voltage of detection signal predetermined reference voltage corresponding with the preset reference signal,
When it is described detection voltage be less than the predetermined reference voltage when export high level pulse signal, when it is described detection voltage be more than or
Low level pulse signal is exported during equal to the predetermined reference voltage, according to the pulse signal of the high level of output and institute
It states low level pulse signal and determines the synchronization pulse.
4. a kind of video formats switching device, which is characterized in that described device includes：
The optical signal for receiving the optical signal that electric lighting is sent, and is converted to electric signal by photoelectric conversion module；
First determining module, for determining detection signal according to the electric signal；
Second determining module, for determining synchronization pulse according to preset reference signal and the detection signal；
Computing module, for calculating the frequency of the synchronization pulse；
Handover module, for carrying out video formats switching according to the frequency of the synchronization pulse.
5. device as claimed in claim 4, which is characterized in that the photoelectric conversion module includes：Phototriode；The light
The collector of quick triode is connected with the first power end, the emitter of the phototriode and the first determining module phase
Even, the base stage of the phototriode is used to receive the optical signal.
6. device as claimed in claim 4, which is characterized in that first determining module is specifically used for removing the electric signal
Direct current biasing and enhanced processing determine the detection signal.
7. device as claimed in claim 6, which is characterized in that first determining module includes：First resistor, the first amplification
Device, the first capacitance, second resistance, 3rd resistor, the 4th resistance, the second amplifier；Wherein,
The normal phase input end of first amplifier is connected with the photoelectric conversion module, described for receiving the electric signal
The output terminal of the first amplifier first end phase with the negative-phase input of first amplifier and first capacitance respectively
Even；
The first end of the first resistor is connected with the normal phase input end of first amplifier, the second end of the first resistor
Ground connection；
The second end of first capacitance is connected with the first end of the second resistance；
The second end of the second resistance inputs respectively with the negative of the first end of the 3rd resistor and second amplifier
End is connected, and the normal phase input end of second amplifier is connected with the first end of the 4th resistance, and the of the 4th resistance
Two ends are grounded, the output terminal of second amplifier respectively with the second end of the 3rd resistor and the second determining module phase
Even, for exporting the detection signal.
8. device as claimed in claim 4, which is characterized in that second determining module, specifically for the detection is believed
Compared with number corresponding detection voltage predetermined reference voltage corresponding with the preset reference signal, to detect voltage small when described
The pulse signal of high level is exported when the predetermined reference voltage, when the detection voltage is greater than or equal to the preset reference
Low level pulse signal is exported during voltage, is believed according to the pulse signal of the high level of output and the low level pulse
Number determine the synchronization pulse.
9. device as claimed in claim 8, which is characterized in that second determining module includes：Comparator, the 5th resistance and
6th resistance；Wherein,
The negative-phase input of the comparator is connected with the output terminal of first determining module, for receiving the detection letter
Number, the normal phase input end of the comparator respectively with the first end of the 5th resistance and the first end phase of the 6th resistance
Even, the second end of the 5th resistance is connected with second source end, the second end ground connection of the 6th resistance, the comparator
Output terminal is connected with the computing module, for exporting the synchronization pulse.
10. device as claimed in claim 4, which is characterized in that the computing module includes counter；The counter it is defeated
Enter end for receiving the synchronization pulse, the output terminal of the counter is connected with the handover module, for exporting
State the frequency of synchronization pulse.
11. device as claimed in claim 10, which is characterized in that the handover module includes processor；The processor
Input terminal is connected with the output terminal of the counter, is cut for receiving the frequency of synchronization pulse progress video formats
It changes.
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