CN106713866B - A kind of analog video signal transmitting device and its transmission method - Google Patents
A kind of analog video signal transmitting device and its transmission method Download PDFInfo
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- CN106713866B CN106713866B CN201611238762.0A CN201611238762A CN106713866B CN 106713866 B CN106713866 B CN 106713866B CN 201611238762 A CN201611238762 A CN 201611238762A CN 106713866 B CN106713866 B CN 106713866B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract
The invention discloses a kind of analog video signal transmitting device and its transmission methods, by providing a predeterminated voltage signal with preset duration and after dividing to video signal output, when only judging that the current voltage of video signal output is less than predetermined threshold value voltage and the coaxial command signal of backend processing unit transmission is not detected in the preset time period after preset duration in preset duration, it determines that image acquisition units need to export SD analog video signal, and enters next default judgement period.In addition to the aforementioned conditions, it determines that image acquisition units need to export high definition analog video signal, and enters next default judgement period.Therefore, above-mentioned analog video signal transmitting device provided in an embodiment of the present invention compared with prior art can be without manual operation, it is in image acquisition units under optimal output mode, and then entire analog video signal transmitting device is made to be in optimal working performance.
Description
Technical field
The present invention relates to Analogvideotransmission technical field, in particular to a kind of analog video signal transmitting device and its biography
Transmission method.
Background technique
In Analogvideotransmission technical field, common Analogvideotransmission system, as shown in Figure 1, including the mould of front end
Intend video camera 110, back-end processing equipment 120 and is connected to coaxial between analog video camera 110 and back-end processing equipment 120
Cable 130.Analog video camera 110 converts optical signals into electric signal to acquire vision signal, and will collect vision signal
After carrying out image algorithm processing, exported by video signal output Video Out to back-end processing equipment 120, back-end processing
Equipment 120 receives the analog video signal that analog video camera 110 is sent by video reception end Video In, and to reception
To analog video signal be decoded processing, stored or shown after the treatment.Wherein, analog video is believed in order to prevent
Number input when reflect, general back-end processing equipment 120 can have terminal coupling in video reception end Video In
Resistance.
Currently, when the compatible high definition analog video signal of analog video camera and back-end processing equipment and SD analog video letter
Number output input when, when analog video camera is not connected with back-end processing equipment, i.e., analog video camera is non-loaded, analog video camera
High-definition video signal can be exported, works in Analogvideotransmission system under high definition mode.Upper rear end is connected in analog video camera
When processing equipment, i.e., analog video camera has load, if the back-end processing equipment of connection is processing high definition analog video signal
High definition back-end processing equipment, then high definition back-end processing equipment can send coaxial command signal to analog video camera, image in simulation
After machine correctly identifies, the back-end processing equipment that analog video camera just judges connection is high definition back-end processing equipment, and to the back-end
Processing equipment exports high-definition video signal, works in Analogvideotransmission system under high definition mode.If at the rear end of connection
Reason equipment is to handle the SD back-end processing equipment of SD analog video signal, due to handling the rear end of SD analog video signal
Processing equipment cannot send coaxial command signal, therefore within a certain period of time, itself be not received by coaxial life if detected
Signal is enabled, the back-end processing equipment that analog video camera just judges connection is SD back-end processing equipment, and handles set to the back-end
Standby output SD vision signal, works in Analogvideotransmission system under SD mode.
However, after above-mentioned analog video camera connects upper high definition back-end processing equipment, when analog video camera is prior to connection
When high definition back-end processing device power starts, it is possible that the high definition back-end processing equipment to be received such as analog video camera was sent
The phenomenon of coaxial command signal time-out causes analog video camera will be after the high definition of connection so that analog video camera be made to judge by accident
End processing equipment is judged as SD back-end processing equipment to export SD analog video signal, reduces Analogvideotransmission system
Working performance.Also, it can just make mould under high definition mode since analog video camera and back-end processing equipment at this time should work
Quasi- Video transmission system reaches optimal working performance, therefore in order to make Analogvideotransmission system reach optimal workability
Can, it is general using the method for plugging coaxial cable again manually in the prior art, it can just make entire Analogvideotransmission system work
Make under high definition mode.
Summary of the invention
The embodiment of the present invention provides a kind of analog video signal transmitting device and its transmission method, to solve the prior art
The problem of middle needs manual operation can just make entire Analogvideotransmission system reach optimal working performance.
Therefore, the embodiment of the invention provides a kind of analog video signal transmitting devices, comprising: image acquisition units, after
End processing unit, voltage superposition unit, detection determination unit and the coaxial cable being connect with the backend processing unit；Its
In,
Described image acquisition unit, for acquiring vision signal and being passed the vision signal by video signal output
It is defeated by the backend processing unit；
The voltage superposition unit, the video for judging the period in current preset and being sent in described image acquisition unit
Signal is in the preset duration of blanking zone, and the video signal output is transferred to after dividing to predeterminated voltage signal；
The detection determination unit, for only judging the current electricity of the video signal output in the preset duration
Pressure is less than predetermined threshold value voltage and the backend processing unit is not detected in the preset time period after the preset duration
When the coaxial command signal sent, determine that described image acquisition unit needs to export SD analog video signal, and enter next
A default judgement period；In addition to this, it determines that described image acquisition unit needs to export high definition analog video signal, goes forward side by side
Enter next default judgement period；
The backend processing unit, the vision signal sent for receiving described image acquisition unit, and only have
High definition analog video signal generates coaxial command signal and the coaxial command signal of generation is sent to the figure when receiving ability
As acquisition unit.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the voltage superposition list
Member includes: voltage input module and division module；Wherein,
The voltage input module, for judging in the period in current preset, in the view that described image acquisition unit is sent
Frequency signal is in the preset duration of blanking zone predeterminated voltage signal being supplied to the division module；
The division module, for being transferred to the vision signal after dividing to the predeterminated voltage signal received
Output end.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the coaxial cable
Equivalent d.c. resistance value is less than the resistance value of the terminal coupling resistance in the backend processing unit；
The division module includes: divider resistance；Wherein, the first end of the divider resistance and the voltage input module
It is connected, for receiving the predeterminated voltage signal of the voltage input module output, the second end of the divider resistance and the view
Frequency signal output end is connected, for the predeterminated voltage signal after partial pressure to be supplied to the video signal output；
The predetermined threshold value voltage V0Meet formula:Wherein, Vdd represents the predeterminated voltage letter
Number voltage, r0Represent the resistance value of the terminal coupling resistance, rmRepresent the resistance value of the divider resistance, the default electricity
The voltage of pressure signal is greater than the voltage after the backend processing unit powers on.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the voltage input mould
Block includes: P-type transistor；Wherein,
The grid of the P-type transistor is connected with superposing control signal end, and source electrode is used to receive the predeterminated voltage signal,
Drain electrode is connected with the division module, for the predeterminated voltage signal to be supplied to the division module.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the detection determines single
When member is specifically used for judging the current voltage in the preset duration not less than the predetermined threshold value voltage, the figure is determined
As acquisition unit needs to export the high definition analog video signal；Judge that the current voltage is less than institute in the preset duration
When stating predetermined threshold value voltage and detecting the coaxial command signal in the preset time period after the preset duration, determine
Described image acquisition unit needs to export the high definition analog video signal.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the detection determines single
Member is also used in the preset duration that the current preset judges the period, in the current voltage for judging the video signal output
Before the predetermined threshold value voltage, the current voltage of the video signal output is acquired.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, the detection determines single
Member is specifically used for acquiring the current voltage that the video signal output is in analog signal, and by collected in analog signal
Current voltage is converted to the current voltage in digital signal.
Preferably, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, described image acquisition is single
Member is also used to that collected vision signal is converted into the high definition when determination needs to export the high definition analog video signal
Analog video signal；Alternatively, collected vision signal is converted when determination needs to export the SD analog video signal
At the SD analog video signal.
Correspondingly, the embodiment of the invention also provides a kind of any of the above-described kind of analog videos provided in an embodiment of the present invention to believe
The transmission method of number transmitting device, comprising:
Judge the period in current preset and in the preset duration that vision signal is in blanking zone, to predeterminated voltage signal into
The video signal output is transferred to after row partial pressure；Working as the video signal output is only judged in the preset duration
Preceding voltage is less than predetermined threshold value voltage and coaxial command signal is not detected in the preset time period after the preset duration
When, it determines and needs to export SD analog video signal, and enter next default judgement period；In addition to this, determining needs
High definition analog video signal is exported, and enters next default judgement period.
Preferably, in above-mentioned transmission method provided in an embodiment of the present invention, the determining described image acquisition unit is needed
High definition analog video signal is exported, is specifically included:
When judging the current voltage in the preset duration not less than the predetermined threshold value voltage, determination needs to export
The high definition analog video signal；
Judge that the current voltage is less than the predetermined threshold value voltage and in the preset duration in the preset duration
When detecting the coaxial command signal in preset time period later, determination needs to export the high definition analog video signal.
Preferably, in above-mentioned transmission method provided in an embodiment of the present invention, the pre- of period is judged in the current preset
If in duration, before the current voltage for judging the video signal output is less than the predetermined threshold value voltage, further includes:
Acquire the current voltage of the video signal output.
Preferably, in above-mentioned transmission method provided in an embodiment of the present invention, the acquisition video signal output
Current voltage, specifically include:
The current voltage that the video signal output is in analog signal is acquired, and being worked as collected in analog signal
Preceding voltage is converted to the current voltage in digital signal.
Preferably, in above-mentioned transmission method provided in an embodiment of the present invention, further includes: need to export the height in determination
When clear analog video signal, collected vision signal is converted into the high definition analog video signal；Alternatively,
When determination needs to export the SD analog video signal, collected vision signal is converted into the SD
Analog video signal.
The present invention has the beneficial effect that:
Analog video signal transmitting device and its transmission method provided in an embodiment of the present invention, by being exported to vision signal
End provides a predeterminated voltage signal with preset duration and after dividing, and only judges that vision signal exports in preset duration
The current voltage at end is less than predetermined threshold value voltage and back-end processing list is not detected in the preset time period after preset duration
When the coaxial command signal that member is sent, determine that image acquisition units need to export SD analog video signal, and enter next
It is default to judge that the period is judged again.In addition to the aforementioned conditions, determine that image acquisition units need to export high definition simulation view
Frequency signal, and entrance next default judgement period is judged again.Therefore, above-mentioned simulation view provided in an embodiment of the present invention
Frequency signal transmitting apparatus can be such that image acquisition units are in most without manual operation compared with prior art
Under good output mode, and then entire analog video signal transmitting device is made to be in optimal working performance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Analogvideotransmission system in the prior art；
Fig. 2 is one of the structural schematic diagram of analog video signal transmitting device provided in an embodiment of the present invention；
Fig. 3 is the second structural representation of analog video signal transmitting device provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram that coaxial command signal provided in an embodiment of the present invention carries out Shape correction；
Fig. 5 is the concrete structure schematic diagram of analog video signal transmitting device shown in Fig. 3；
Fig. 6 is the flow chart of analog video signal transmission method provided in an embodiment of the present invention；
Fig. 7 is the specific flow chart of analog video signal transmission method provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose of the present invention, the technical scheme and advantages are more clear, with reference to the accompanying drawing, to the embodiment of the present invention
The analog video signal transmitting device of offer and its specific embodiment of transmission method are described in detail.It should be appreciated that
Preferred embodiments described herein are only used to illustrate and explain the present invention, is not intended to limit the present invention.And do not conflicting
In the case where, the features in the embodiments and the embodiments of the present application can be combined with each other.
The embodiment of the invention provides a kind of analog video signal transmitting devices, as shown in Figure 2, comprising: Image Acquisition list
It member 210, backend processing unit 220, voltage superposition unit 230, detection determination unit 240 and connect with backend processing unit
Coaxial cable 250；Wherein,
Image acquisition units 210, for acquiring vision signal and being believed video by video signal output Video Out
Number it is transferred to backend processing unit 220；
Voltage superposition unit 230, the video letter for judging the period in current preset and being sent in image acquisition units 210
Number in blanking zone preset duration in, be transferred to video signal output Video after dividing to predeterminated voltage signal VDD
Out；
Determination unit 240 is detected, for only judging the current electricity of video signal output Video Out in preset duration
Pressure is less than predetermined threshold value voltage and the transmission of backend processing unit 220 is not detected in the preset time period after preset duration
It when coaxial command signal, determines that image acquisition units 210 need to export SD analog video signal, and enters next preset and sentence
The disconnected period；In addition to this, it determines that image acquisition units 210 need to export high definition analog video signal, and enters next default
Judge the period；
Backend processing unit 220, for receiving the vision signal of the transmission of image acquisition units 210, and only with high definition
Analog video signal generates coaxial command signal when receiving ability, and the coaxial command signal of generation is sent to Image Acquisition
Unit 210.
Above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, comprising: image acquisition units, back-end processing
Unit, voltage superposition unit, detection determination unit and the coaxial cable being connect with backend processing unit；Wherein, by above-mentioned
The mutual cooperation of four units, can be by providing presetting with preset duration and after dividing to video signal output
Voltage signal, and only judge that the current voltage of video signal output is less than predetermined threshold value voltage and default in preset duration
When the coaxial command signal of backend processing unit transmission being not detected in the preset time period after duration, Image Acquisition list is determined
Member needs to export SD analog video signal, and entrance next default judgement period is judged again.Except above-mentioned condition it
Outside, it determines that image acquisition units need to export high definition analog video signal, and enters next default judgement period progress again
Secondary judgement.Therefore, above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, compared with prior art, Ke Yi
It in the case where without manual operation, is in image acquisition units under optimal output mode, and then believes entire analog video
Number transmitting device is in optimal working performance.
It should be noted that not having the backend processing unit of high definition analog video signal reception ability generally cannot export
Coaxial command signal, therefore detecting determination unit can be by determining that the coaxial order that backend processing unit transmission is not detected is believed
Number when, can determine that image acquisition units need to export SD analog video signal；By confirmly detecting backend processing unit
When the coaxial command signal sent, it can determine that image acquisition units need to export high definition analog video signal.
It should be noted that scanning in the scanning process for converting optical signals to electric signal always from the upper left of image
Angle starts, and advances horizontally forward, while scanning element is also moved down with slower rate.When scanning the complete image of a frame, In
After scanning element scans through a frame, the upper left corner of image is returned to from the lower right corner of image, starts the scanning of a new frame, this when
Between be spaced, be called field blanking.In field blanking, without the transmission of vision signal, generally there is low level vertical blanking impulse.
Blanking zone during video signal transmission is field blanking, and the field blanking during video signal transmission in the prior art
Identical, therefore not to repeat here.In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention
In, predeterminated voltage Signal averaging is on a field blanking row.Field blanking row with it is identical in the prior art, therefore not to repeat here.
It should be noted that working as coaxial line in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention
Very in short-term, equivalent d.c. resistance value can be approximated to be 0 to cable, in the specific implementation, in above-mentioned mould provided in an embodiment of the present invention
In quasi- video signal transmission device, the value of predetermined threshold value voltage are as follows: connect upper coaxial cable and rear end in image acquisition units
When processing unit does not power on and the equivalent d.c. resistance value of coaxial cable is zero, the corresponding voltage value of video signal output.
However in practical application, the equivalent d.c. resistance value due to coaxial cable is not 0, in practical applications, setting it is pre-
If threshold voltage may have that voltage value more corresponding than the video signal output is smaller.Also, due to inhomogeneity
The predetermined threshold value voltage that the analog video signal transmitting device of type requires may be different, therefore when the predetermined threshold value voltage of setting needs
When more smaller than the current voltage of video signal output, which needs according to required by actual application environment
Size designs determination, is not limited thereto.
It should be noted that in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, Image Acquisition
Unit is specifically used for the optical signal of acquisition body surface, and collected optical signal is converted to vision signal.Wherein, body surface
The optical signal that can issue for the object itself of optical signal；Alternatively, the optical signal of body surface can also the object reflection
Optical signal in ambient enviroment.Certainly, the optical signal of body surface may be the optical signal and the object that the object itself issues
The superposition of optical signal in the ambient enviroment of body reflection, is not limited thereto.
It should be noted that presetting judgement in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention
Interval duration between period is greater than or equal to the maintenance duration of blanking zone, and the maintenance duration of blanking zone is greater than preset duration.Its
In, preset duration is less than or equal to the duration of a field blanking row.In specific application, it presets when judging the interval between the period
Long, the maintenance duration of blanking zone and preset duration needs design determination, according to size required by actual application environment
This is not construed as limiting.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, such as Fig. 3 institute
Show, voltage superposition unit 230 can specifically include: voltage input module 231 and division module 232；Wherein,
Voltage input module 231, for judging in the period in current preset, in the video that image acquisition units 210 are sent
Signal is in the preset duration of blanking zone predeterminated voltage signal VDD being supplied to division module 232；
Division module 232, for being transferred to vision signal output after dividing to the predeterminated voltage signal received
Hold Video Out.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, predeterminated voltage
Signal is the voltage signal with high level.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, detection is determined
When unit is specifically used for judging current voltage in preset duration not less than predetermined threshold value voltage, image acquisition units needs are determined
Export high definition analog video signal；Judge that current voltage is less than predetermined threshold value voltage and after preset duration in preset duration
Preset time period in when detecting coaxial command signal, determine that image acquisition units need to export high definition analog video signal.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, detection is determined
Unit is also used in the preset duration that current preset judges the period, is less than in the current voltage for judging video signal output pre-
If before threshold voltage, acquiring the current voltage of video signal output.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, detection is determined
Unit is specifically used for the current voltage that acquisition video signal output is in analog signal, and working as collected in analog signal
Preceding voltage is converted to the current voltage in digital signal.
General analog-digital converter can convert analog signals into digital signal, in the specific implementation, implement in the present invention
In the above-mentioned analog video signal transmitting device that example provides, detection determination unit can also include: analog-digital converter, mould therein
Number converter is used to acquire the current voltage that video signal output is in analog signal, and working as collected in analog signal
Preceding voltage is converted to the current voltage in digital signal.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, Image Acquisition
Unit is also used to when determination needs to export high definition analog video signal, and collected vision signal is converted into high definition simulation view
Frequency signal；Alternatively, collected vision signal is converted into SD simulation when determination needs to export SD analog video signal
Vision signal.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, Image Acquisition
Unit is also used to control the functions such as infrared lamp, optical filter switching, power zoom, auto iris and key assignments detection, since image is adopted
The principle that collection unit controls these functions is same as the prior art, and therefore not to repeat here.
General coaxial command signal, can when being transferred to the video signal output of image acquisition units by coaxial cable
Can be distorted causes edge to slow down, when the video signal output of image acquisition units receives coaxial order using I/O interface
When signal, since I/O interface can only identify the precipitous signal in edge, the coaxial command signal being distorted cannot direct quilt
Therefore I/O interface identification the problem of cannot being identified by IO in order to avoid the coaxial command signal after being distorted, is needed to generation
The coaxial command signal of distortion carries out Shape correction.In the specific implementation, in above-mentioned analog video provided in an embodiment of the present invention
In signal transmitting apparatus, the coaxial command signal that the backend processing unit that detection determination unit detects is sent is true after testing
Order member carries out the coaxial command signal after Shape correction.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, to coaxial life
The method for enabling signal carry out Shape correction are as follows:
Determine whether the voltage for the coaxial command signal for being transferred to video signal output is greater than fixed reference potential signal
Voltage；
If so, output has the coaxial command signal of high level；
If it is not, then output has low level coaxial command signal.
The schematic illustration of coaxial command signal after obtaining shaping by above-mentioned reshaping treatment method, as shown in Figure 4.Its
In, OS_1 represents the coaxial command signal at video reception end, and OS_2 represents the coaxial command signal of video signal output,
OS_3 represents the coaxial command signal after Shape correction, and Vref represents fixed reference potential signal.As can be seen that by vision signal
The coaxial command signal OS_2 of output end is compared with fixed reference potential signal Vref, in the electricity of coaxial command signal OS_2
When pressure is higher than the voltage of fixed reference potential signal Vref, the available coaxial command signal with high level is coaxially being ordered
It is available that there is low level coaxial order when the voltage of signal OS_2 being enabled to be lower than the voltage of fixed reference potential signal Vref
Signal realizes the precipitous shaping in coaxial command signal edge to obtain the coaxial command signal OS_3 after Shape correction
Purpose.
Combined with specific embodiments below, to the voltage input module in analog video signal transmitting device provided by the invention
It is described in detail with division module.It should be noted that being in order to preferably explain the present invention, but not limit in the present embodiment
The present invention.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, such as Fig. 5 institute
Show, the equivalent d.c. resistance value of coaxial cable 250 is less than the resistance value of the terminal coupling resistance R0 in backend processing unit 220；
Division module 232 can specifically include: divider resistance Rm；Wherein, the first end and voltage input of divider resistance Rm
Module 231 is connected, for receiving the predeterminated voltage signal of the output of voltage input module 231, the second end and view of divider resistance Rm
Frequency signal output end Video Out is connected, for the predeterminated voltage signal after partial pressure to be supplied to video signal output Video
Out；
Predetermined threshold value voltage V0Meet formula:Wherein, Vdd represents predeterminated voltage signal VDD's
Voltage, r0The resistance value of GC group connector build-out resistor R0, rmRepresent the resistance value of divider resistance Rm, and predeterminated voltage signal VDD
Voltage Vdd be greater than backend processing unit 220 power on after voltage.It is to pass through it generally after backend processing unit 220 powers on
In reference voltage end VCC power.It is general in practical application, due in coaxial cable 250 very its Equivalent DC in short-term
Resistance value is not 0, and the internal resistance of the reference voltage end VCC in backend processing unit 220 is not also 0, and terminal coupling resistance R0
It is not also 0 with the equivalent resistance of the internal resistance of reference voltage end VCC in backend processing unit 220 and other resistance after series-parallel
Etc. factors, therefore the predetermined threshold value voltage V set in practical applications0May compareIt is smaller.Also,
Since the predetermined threshold value voltage that different types of analog video signal transmitting device requires may be different, when practical application is set
Fixed predetermined threshold value voltage needs to compareWhen smaller, which needs according to practical application ring
Size required by border designs determination, is not limited thereto.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, divider resistance
Resistance value need according to actual needs to be not limited thereto to be designed.
The characteristic impedance Z of general coaxial cable is 50 ohm or 75 ohm, in the specific implementation, is mentioned in the embodiment of the present invention
In the above-mentioned analog video signal transmitting device supplied, as shown in figure 5, one end of terminal coupling resistance R0 and backend processing unit
220 video reception end Video In is connected, and the other end is connected with ground terminal GND.And the electricity of terminal coupling resistance R0
Resistance value r0Meet formula: r0=Z.
The above is only the specific knots of the division module in the analog video signal transmitting device for illustrating the present invention offer
Structure, in the specific implementation, the specific structure of division module are not limited to above structure provided in an embodiment of the present invention, can also be this
Other structures known to the technical staff of field, are not limited thereto.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, such as Fig. 5 institute
Show, voltage input module 231 can specifically include: P-type transistor Qp；Wherein,
The grid and superposing control signal end CS of P-type transistor Qp, source electrode drain for receiving predeterminated voltage signal VDD
It is connected with division module 232, for predeterminated voltage signal VDD to be supplied to division module 232.
General P-type transistor is in the conductive state when the signal of its grid is low level, in the specific implementation, in this hair
In the above-mentioned analog video signal transmitting device that bright embodiment provides, the effective impulse signal of superposing control signal end is low electricity
It is flat, and a length of preset duration when low level maintenance.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, superposing control
The signal of signal end can be provided by image acquisition units, and the unit that can also can be realized function of the present invention by other provides,
It is not limited thereto.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, such as Fig. 5 institute
Show, P-type transistor Qp is on shape under the control with low level superposing control signal end CS in preset duration
State, and predeterminated voltage signal VDD is supplied to division module 232, there is the default of preset duration to the output of division module 232
Voltage signal.
Certainly, in the specific implementation, the transistor that voltage input module includes may be set to be N-type, at this time superposition control
The effective impulse signal of signal end processed is high level, and a length of preset duration when the maintenance of high level.
The above is only the tools of the voltage input module in the analog video signal transmitting device for illustrating the present invention offer
Body structure, in the specific implementation, the specific structure of voltage input module are not limited to above structure provided in an embodiment of the present invention, also
Can be skilled person will appreciate that other structures, be not limited thereto.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, such as Fig. 5 institute
Show, backend processing unit 220 can also include: N-type transistor Qn and first resistor R1；Wherein,
The grid of N-type transistor Qn generates signal end TS with coaxial order and is connected, and source electrode is connected with reference voltage end VCC,
Drain electrode is connected with the first end of first resistor R1；
The second end of first resistor R1 is connected for by the letter of reference voltage end VCC with video reception end Video In
Number it is supplied to video reception end Video In.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, reference voltage
The signal at end is the voltage signal with high level, and the voltage amplitude of the signal of reference voltage end is less than predeterminated voltage signal
Voltage amplitude.
In the specific implementation, coaxial to order in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention
When generating the effective impulse signal of signal end as high level, and coaxially ordering the maintenance for generating the effective impulse signal of signal end
Length needs according to the actual situation to be not limited thereto to be designed determination.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, N-type transistor
It is in the conductive state under the control that coaxial order generates signal, and the signal of reference voltage end is supplied to the of first resistor
The signal of its first end is divided and is supplied to video reception end by one end, first resistor.General coaxial command signal
Being includes high level and low level pulse signal, thus can by the conducting of the N-type transistor in backend processing unit and
The voltage signal of high level and low level voltage signal, are output to the video reception of backend processing unit by shutdown
End, to form coaxial command signal.
Certainly, in the specific implementation, the transistor for being used to form coaxial command signal that backend processing unit includes can also
To be set as p-type, it is low level that coaxial order, which generates the effective impulse signal of signal end, at this time, and coaxially order generates signal
The maintenance duration of the effective impulse signal at end needs according to the actual situation to be not limited thereto to be designed determination.
Certainly, in the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, rear
When end processing unit powers on, reference voltage end is also used to remaining power elements in the processing unit of rear end, wherein back-end processing
Other essential component part elements of unit are it will be apparent to an ordinarily skilled person in the art that having, herein not
It repeats, also should not be taken as limiting the invention.
In the specific implementation, in above-mentioned analog video signal transmitting device provided in an embodiment of the present invention, all crystal
Pipe is metal oxide semiconductor field effect tube (MOS, Metal Oxide Scmiconductor).Generally produced in metal-oxide-semiconductor
When preparation, if source electrode is connected to underlay substrate, the body diode between source electrode and drain electrode will form.
It is below P with the P-type transistor in analog video signal transmitting device shown in fig. 5 and voltage input module 231
For type metal oxide semiconductor field-effect tube, to above-mentioned analog video signal transmitting device provided in an embodiment of the present invention
The state of the current voltage of video signal output and the size of predetermined threshold value voltage and backend processing unit is illustrated.
As shown in figure 5, voltage input module 231 includes P-type transistor Qp, division module 232 includes divider resistance Rm, after
Holding processing unit 220 includes N-type transistor Qn, first resistor R1 and terminal coupling resistance R0.Predetermined threshold value voltageImage acquisition units 210 are when the vision signal that image acquisition units 210 are sent is in field blanking, In
Predeterminated voltage signal VDD, is supplied to the first end of divider resistance Rm by control P-type transistor Qp conducting in preset duration, point
Piezoresistance Rm is exported after the voltage Vdd to the predeterminated voltage signal VDD received is divided to video signal output
Video Out。
(1) when image acquisition units 210 do not connect upper coaxial cable 250, i.e., not connected upper backend processing unit 220
When, open circuit, i.e. video signal output between video signal output Video Out and video reception end Video In
The not connected load of Video Out, therefore load of the resistance value of divider resistance Rm relative to video signal output Video Out
Very little for resistance, so that influence of the divider resistance Rm to the voltage Vdd of predeterminated voltage signal VDD can be ignored, therefore
The current voltage V of video signal output Video Outout1=Vdd, therefore, video signal output Video Out at this time
Current voltage Vout1 meets formula:
(2) when image acquisition units 210 connect upper coaxial cable 250, i.e. image acquisition units 210 and backend processing unit
220 connections, and its in the non-electrifying startup of backend processing unit 220, that is, non-rear end processing unit 220 of reference voltage end VCC
It is access between video signal output Video Out and video reception end Video In, due to rear when remaining power elements
End processing unit 220 does not power on, is equivalent to open circuit between video reception end Video In and reference voltage end VCC, therefore
The current voltage of video signal output Video OutWherein rcRepresent coaxial cable 250
Equivalent d.c. resistance value.When coaxial cable 250 very it is short level off to 0 when, equivalent d.c. resistance value rcIt is similar to 0, therefore, at this time
The current voltage V of video signal output Video Outout2 meet formula:
(3) when image acquisition units 210 connect upper backend processing unit 220, and 220 electrifying startup of backend processing unit
When remaining power elements i.e. in the rear end reference voltage end VCC processing unit 220, video signal output Video Out with
It is access between the Video In of video reception end, the body diode of N-type transistor Qn is connected, so that first resistor R1 and ginseng
The internal resistance for examining voltage end VCC is in parallel with terminal coupling resistance R0.Therefore the current voltage of video signal output Video OutWherein r0' represent first resistor R1 and reference voltage end VCC internal resistance first connect again with terminal
Equivalent resistance after build-out resistor R0 is in parallel, rcFor the equivalent d.c. resistance value of coaxial cable 250.Due to backend processing unit
220 power on, therefore the internal resistance of reference voltage end VCC is very small relative to terminal coupling resistance R0, so that r0' and divider resistance Rm
Resistance value rmCompared to very little, therefore r0' can be ignored.Therefore it can make that video signal output Video Out's is current
VoltageDue to the equivalent d.c. resistance value r of coaxial cable 250cLess than the electricity of terminal coupling resistance Rm
Resistance value rm, i.e. rc<rm, therefore, the current voltage V of video signal output Video Out at this timeout3 meet formula:
To sum up, it is not less than predetermined threshold value voltage V in the current voltage of video signal output Video Out0When, i.e., currently
Voltage is greater than or equal to predetermined threshold value voltage V0When, it may be said that the not connected upper coaxial cable 250 of bright image acquisition units 210, i.e.,
Not connected backend processing unit 220 or image acquisition units 210 connect upper coaxial cable 250 and connect upper back-end processing list
Member 220, and backend processing unit 220 does not power on.It is less than preset threshold in the current voltage of video signal output Video Out
Voltage V0When, it may be said that bright image acquisition units 210 connect upper backend processing unit 220, and backend processing unit 220 powers on.
Based on the same inventive concept, the embodiment of the invention also provides any of the above-described kind provided in an embodiment of the present invention simulations
The transmission method of video signal transmission device, as shown in Figure 6, comprising the following steps:
S601, the period is judged in current preset and in the preset duration that vision signal is in blanking zone, to predeterminated voltage
Signal is transferred to video signal output after being divided；The current voltage of video signal output is only judged in preset duration
When less than predetermined threshold value voltage and coaxial command signal is not detected in the preset time period after preset duration, determines and need
SD analog video signal is exported, and enters next default judgement period；In addition to this, it determines and needs to export high definition simulation view
Frequency signal, and enter next default judgement period.
Above-mentioned transmission method provided in an embodiment of the present invention can make Image Acquisition without manual operation
Unit is under optimal output mode, and then entire analog video signal transmitting device is made to be in optimal working performance.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, the Equivalent DC electricity of coaxial cable
Resistance value is less than the resistance value of the terminal coupling resistance in backend processing unit；
When division module includes divider resistance, predetermined threshold value voltage V0Meet formula:Wherein,
Vdd represents the voltage of predeterminated voltage signal, r0The resistance value of GC group connector build-out resistor, rmThe resistance value of divider resistance is represented, in advance
If the voltage of voltage signal is greater than the voltage after backend processing unit powers on.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, image acquisition units needs are determined
High definition analog video signal is exported, is specifically included:
When judging current voltage in preset duration not less than predetermined threshold value voltage, determination needs to export high definition analog video
Signal；
Judge that current voltage is less than predetermined threshold value voltage and the preset time period after preset duration in preset duration
When inside detecting coaxial command signal, determination needs to export high definition analog video signal.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, acquisition vision signal is specifically included:
The optical signal for acquiring body surface, is converted to vision signal for collected optical signal.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, the period is judged in current preset
In preset duration, before the current voltage for judging video signal output is less than predetermined threshold value voltage, can also include:
Acquire the current voltage of video signal output.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, video signal output is acquired
Current voltage can specifically include:
The current voltage that video signal output is in analog signal is acquired, and by the collected current electricity in analog signal
Pressure is converted to the current voltage in digital signal.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, further includes: need to export in determination
When high definition analog video signal, collected vision signal is converted into high definition analog video signal.
Alternatively, in the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, further includes: needed determining
When exporting SD analog video signal, collected vision signal is converted into SD analog video signal.
General coaxial command signal, can when being transferred to the video signal output of image acquisition units by coaxial cable
Can be distorted causes edge to slow down, when the video signal output of image acquisition units uses I/O interface, since IO connects
Mouth can only identify the precipitous signal in edge, therefore the coaxial command signal being distorted cannot be identified directly by I/O interface, therefore,
The problem of cannot being identified by IO in order to avoid the coaxial command signal after being distorted, needs to the coaxial order letter being distorted
Number carry out Shape correction.In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, detection determination unit inspection
The coaxial command signal that the backend processing unit measured is sent is the coaxial life that determination unit carries out after Shape correction after testing
Enable signal.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, coaxial command signal is carried out whole
The method of shape processing are as follows:
Determine whether the voltage for the coaxial command signal for being transferred to video signal output is greater than fixed reference potential signal
Voltage；
If so, output has the coaxial command signal of high level；
If it is not, then output has low level coaxial command signal.
In the specific implementation, in above-mentioned transmission method provided in an embodiment of the present invention, further includes: image acquisition units control
The functions such as infrared lamp, optical filter switching, power zoom, auto iris and key assignments detection processed, since image acquisition units control this
The principle of a little functions is same as the prior art, and therefore not to repeat here.
Need to export high definition analog video signal or SD mould to determination in above-mentioned transmission method provided by the invention below
Quasi- vision signal is specifically described, as shown in fig. 7, detailed process includes the following steps:
S701, judge in the period in current preset, be in the preset duration of blanking zone in the vision signal of transmission, to pre-
If voltage signal is transferred to video signal output after being divided；View is judged in the preset duration that current preset judges the period
Whether the current voltage of frequency signal output end is less than predetermined threshold value voltage.If judging, current voltage is not less than predetermined threshold value voltage,
Then follow the steps S702；If judging, current voltage is less than predetermined threshold value voltage, thens follow the steps S703.
S702, determination need to export high definition analog video signal, until judging that video is believed in next default judgement period
Until whether the current voltage of number output end is less than predetermined threshold value voltage.
S703, determine whether to detect coaxial command signal in the preset time period after preset duration.If so, holding
Row step S704；If it is not, thening follow the steps S705.
S704, determination need to export high definition analog video signal, until judging that video is believed in next default judgement period
Until whether the current voltage of number output end is less than predetermined threshold value voltage.
S705, determination need to export SD analog video signal, until judging that video is believed in next default judgement period
Until whether the current voltage of number output end is less than predetermined threshold value voltage.
Above-mentioned analog video signal transmitting device and its transmission method provided in an embodiment of the present invention, by vision signal
Output end provides a predeterminated voltage signal with preset duration and after dividing, and vision signal is only judged in preset duration
The current voltage of output end is less than predetermined threshold value voltage and is not detected at rear end in the preset time period after preset duration
When managing the coaxial command signal that unit is sent, determine that image acquisition units need to export SD analog video signal, and under entrance
It presets for one and judges that the period is judged again.In addition to the aforementioned conditions, determine that image acquisition units need to export high definition mould
Quasi- vision signal, and entrance next default judgement period is judged again.Therefore, above-mentioned mould provided in an embodiment of the present invention
Quasi- video signal transmission device can make at image acquisition units without manual operation compared with prior art
Under optimal output mode, and then entire analog video signal transmitting device is made to be in optimal working performance.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of analog video signal transmitting device characterized by comprising image acquisition units, backend processing unit, voltage
Superpositing unit, detection determination unit and the coaxial cable being connect with the backend processing unit；Wherein,
Described image acquisition unit, for acquire vision signal and by video signal output by the video signal transmission to
The backend processing unit；
The voltage superposition unit, the vision signal for judging the period in current preset and being sent in described image acquisition unit
In preset duration in blanking zone, the video signal output is transferred to after dividing to predeterminated voltage signal；
The detection determination unit judges that the current voltage of the video signal output is small for only in the preset duration
It the backend processing unit is not detected in predetermined threshold value voltage and in the preset time period after the preset duration sends
Coaxial command signal when, determine that described image acquisition unit needs to export SD analog video signal, and enter next institute
It states to preset and judges the period；In addition to this, determine that described image acquisition unit needs to export high definition analog video signal, and under entrance
One default judgement period；
The backend processing unit, the vision signal sent for receiving described image acquisition unit, and only with high definition
Analog video signal generates coaxial command signal and the coaxial command signal of generation is sent to described image and adopts when receiving ability
Collect unit；
The voltage superposition unit includes: voltage input module and division module；Wherein,
The voltage input module, for judging in the period in current preset, in the video letter that described image acquisition unit is sent
Predeterminated voltage signal is supplied to the division module in number preset duration in blanking zone；
The division module, for being transferred to the vision signal output after dividing to the predeterminated voltage signal received
End；
The equivalent d.c. resistance value of the coaxial cable is less than the resistance value of the terminal coupling resistance in the backend processing unit；
The division module includes: divider resistance；Wherein, the first end of the divider resistance and the voltage input module phase
Even, for receiving the predeterminated voltage signal of the voltage input module output, the second end of the divider resistance and the video
Signal output end is connected, for the predeterminated voltage signal after partial pressure to be supplied to the video signal output；
The predetermined threshold value voltage V0Meet formula:Wherein, Vdd represents the predeterminated voltage signal
Voltage, r0Represent the resistance value of the terminal coupling resistance, rmRepresent the resistance value of the divider resistance, the predeterminated voltage
The voltage of signal is greater than the voltage after the backend processing unit powers on.
2. analog video signal transmitting device as described in claim 1, which is characterized in that the voltage input module includes: P
Transistor npn npn；Wherein,
The grid of the P-type transistor is connected with superposing control signal end, and source electrode drains for receiving the predeterminated voltage signal
It is connected with the division module, for the predeterminated voltage signal to be supplied to the division module.
3. analog video signal transmitting device as described in claim 1, which is characterized in that the detection determination unit is specifically used
When judging the current voltage in the preset duration not less than the predetermined threshold value voltage, determine that described image acquisition is single
Member needs to export the high definition analog video signal；Judge that the current voltage is less than the default threshold in the preset duration
Threshold voltage and when detecting the coaxial command signal in the preset time period after the preset duration, determines described image
Acquisition unit needs to export the high definition analog video signal.
4. analog video signal transmitting device as described in claim 1, which is characterized in that the detection determination unit is also used to
In the preset duration that the current preset judges the period, it is less than in the current voltage for judging the video signal output described
Before predetermined threshold value voltage, the current voltage of the video signal output is acquired.
5. analog video signal transmitting device as claimed in claim 4, which is characterized in that the detection determination unit is specifically used
In acquiring the current voltage that the video signal output is in analog signal, and by the collected current voltage in analog signal
Be converted to the current voltage in digital signal.
6. analog video signal transmitting device as described in any one in claim 1-5, which is characterized in that described image acquisition is single
Member is also used to that collected vision signal is converted into the high definition when determination needs to export the high definition analog video signal
Analog video signal；Alternatively, collected vision signal is converted when determination needs to export the SD analog video signal
At the SD analog video signal.
7. a kind of transmission method of analog video signal transmitting device as claimed in any one of claims 1 to 6, which is characterized in that
Include:
The period is judged in current preset and in the preset duration that vision signal is in blanking zone, predeterminated voltage signal is divided
The video signal output is transferred to after pressure；The current electricity of the video signal output is only judged in the preset duration
When pressure is less than predetermined threshold value voltage and coaxial command signal is not detected in the preset time period after the preset duration, really
Surely it needs to export SD analog video signal, and enters next default judgement period；In addition to this, determination needs to export
High definition analog video signal, and enter next default judgement period.
8. transmission method as claimed in claim 7, which is characterized in that the determining described image acquisition unit needs to export high
Clear analog video signal, specifically includes:
When judging the current voltage in the preset duration not less than the predetermined threshold value voltage, determine described in needing to export
High definition analog video signal；
Judge that the current voltage is less than the predetermined threshold value voltage and after the preset duration in the preset duration
Preset time period in when detecting the coaxial command signal, determination needs to export the high definition analog video signal.
9. transmission method as claimed in claim 7, which is characterized in that judge the preset duration in period in the current preset
It is interior, before the current voltage for judging the video signal output is less than the predetermined threshold value voltage, further includes:
Acquire the current voltage of the video signal output.
10. transmission method as claimed in claim 9, which is characterized in that described to acquire the current of the video signal output
Voltage specifically includes:
The current voltage that the video signal output is in analog signal is acquired, and by the collected current electricity in analog signal
Pressure is converted to the current voltage in digital signal.
11. such as the described in any item transmission methods of claim 7-10, which is characterized in that further include: need to export institute in determination
When stating high definition analog video signal, collected vision signal is converted into the high definition analog video signal；Alternatively,
When determination needs to export the SD analog video signal, collected vision signal is converted into the SD and is simulated
Vision signal.
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