CN107483773B - A kind of dynamic filter device and method based on vision signal - Google Patents
A kind of dynamic filter device and method based on vision signal Download PDFInfo
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- CN107483773B CN107483773B CN201710608710.6A CN201710608710A CN107483773B CN 107483773 B CN107483773 B CN 107483773B CN 201710608710 A CN201710608710 A CN 201710608710A CN 107483773 B CN107483773 B CN 107483773B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a kind of dynamic filter device and method based on vision signal, applied in Analogvideotransmission system, the device is respectively used to connect with video input module and capacitance C1, the device includes: abnormality detection module, vision signal for receiving input, and the voltage value for making a reservation for the vision signal of the first frequency range in vision signal is detected, if detecting, voltage value within a preset range, does not send first control signal to fluctuation filtering module；Fluctuation filtering module, vision signal for receiving input, and when receiving the first control signal of abnormality detection module transmission, the vision signal of predetermined second frequency range in vision signal is filtered out, and the vision signal after the vision signal for filtering out predetermined second frequency range is sent to video input module.The embodiment of the present invention avoids vision signal and is abnormal, caused by long-time blank screen problem, it is excessive and the problem of increase hardware cost to avoid system bulk.
Description
Technical field
The present invention relates to Analogvideotransmission, field of signal processing more particularly to a kind of dynamic filters based on vision signal
Wave apparatus and method.
Background technique
In Analogvideotransmission system, there is a kind of function, is called supply power coaxially function.The purpose of the function, being will be straight
Power supply signal and vision signal mixed transport are flowed, to simplify construction, as shown in Figure 1, the coaxial forward direction of Video Output Modules gives video
Input module provides vision signal, and video input module coaxially provides power supply signal back to Video Output Modules.
Equivalent isolation resistance can directly be powered voltage to avoid vision signal or by electric loading attenuation by absorption, and reduce
The dc-decay of DC power supply.When the power of load changes (such as: opening infrared, zoom etc.), capacitance C1 and C2 two
The voltage at end will also change, so that step jump occurs by the vision signal of C1 and C2, C1 is close to video input
Voltage of the voltage and C2 of module side close to Video Output Modules side will be by being lot more time to be restored to itself
Primary voltage.During voltage restores, vision signal is constantly in step jump state, causes entire vision signal abnormal,
Video input module can not receive anomalous video signal, so that display screen shows the received vision signal of video input module
When showing, it will blank screen occur.The period of the lower vision signal of frequency in vision signal is longer, in jump after being interfered
The time of state is also longer, therefore will occur blank screen for a long time, influences the viewing of user.
In order to solve this problem, most common method is exactly that a constant-current control module, such as Fig. 2 are further added by Fig. 1
Shown, constant-current control module is mainly ensuring that in the changed power of load, for prime power supply system, overall load
The constant i.e. power of load of power and the power summation of constant-current control module do not change.In order to realize the demand, constant current control
System needs additionally to consume certain power consumption, such as: when the power of system load is 2 watt-hours, current constant control can additionally consume 3 watts
Spy is equivalent to one 5 watts of load for supply side, when system load becomes 4 watt-hours, constant current by 2 watts
Control is adjusted to 1 watt for 3 watts of consumption, it is constant to guarantee 5 watts of total power consumption, that is, for power supply system, total work
Consume constant, the electric current between two equivalent isolation resistances will not change, and the voltage at the both ends C1 and C2 will not change, to press down
The generation of abnormal signal processed solves the problem of that display screen shows long-time blank screen to the video data of doping abnormal signal.
But the method for using current constant control, because constant-current control module needs additional power consumption, and increase entire
The thermal gauge lattice of system, and extra power consumption is bigger, and system is hotter, also needs to increase the auxiliary devices such as cooling fin to radiate.
Summary of the invention
The present invention provides a kind of dynamic filter device and method based on vision signal, simulates in the prior art to solve
Video transmission system avoids the extremely caused blank screen problem of vision signal, and caused whole system fever is high, increases cooling fin
Equal auxiliary devices, caused by the excessive problem of system bulk.
To solve the above-mentioned problems, a kind of dynamic filter dress based on vision signal is provided according to an embodiment of the present invention
It sets, is applied in Analogvideotransmission system, described device is respectively used to connect with video input module and capacitance C1, institute
Stating device includes: abnormality detection module and fluctuation filtering module；
The input terminal of the abnormality detection module with the capacitance C1 for connecting, output end and the fluctuation filtering
The first input end of module connects；The abnormality detection module, vision signal for receiving input, and detect the video letter
Make a reservation for the voltage value of the vision signal of the first frequency range in number, if detecting the voltage value not within a preset range, Xiang Suoshu wave
Dynamic filter module sends first control signal；
Second input terminal of the fluctuation filtering module for connect with the capacitance C1, output end for it is described
Video input module connection；The fluctuation filtering module, vision signal for receiving input, and receiving the abnormal inspection
When surveying the first control signal that module is sent, the vision signal of predetermined second frequency range in the vision signal is filtered out, and will filter
Except the vision signal after the vision signal of predetermined second frequency range is sent to the video input module, wherein first frequency range
It is identical or different with the second frequency range.
Further, the abnormality detection module includes: isolation filter module and surge detection module；
The input terminal of the isolation filter module with the capacitance C1 for connecting, output end and the surge detection
The input terminal of module connects；The isolation filter module, vision signal for receiving input, and obtained from the vision signal
The vision signal of predetermined first frequency range is sent to surge detection module by the vision signal for taking predetermined first frequency range；
The output end of the surge detection module is connect with the fluctuation filtering module；The surge detection module, is used for
The vision signal for predetermined first frequency range that the isolation filter module is sent is received, and detects predetermined first frequency range
The voltage value of vision signal, if detecting the voltage value not within a preset range, Xiang Suoshu fluctuation filtering module sends first
Control signal.
Further, the abnormality detection module, if being also used to detect the voltage value within a preset range, Xiang Suoshu
Fluctuation filtering module sends second control signal；
The fluctuation filtering module is also used to according to the second control signal, and the vision signal of the input is direct
It is sent to the video input module.
Further, the isolation filter module includes: video driver, first resistor and first capacitor；
The input terminal of the video driver with the capacitance C1 for connecting, the output end of the video driver
It is connect with the first end of the first resistor, the first end of the second end of the first resistor and the first capacitor and described
The input terminal of surge detection module is all connected with, the second end ground connection of the first capacitor.
Further, the surge detection module includes: first comparator, the second comparator, first crystal diode,
Two crystal diodes, the first power supply and second source；
The negative input of the first comparator is connect with first power supply, the positive input of the first comparator
End is all connected with the negative input of second comparator and the output end of the isolation filter module, and described first compares
The output end of device is connect with the anode of the first crystal diode；
The positive input of second comparator is connect with the second source, the output end of second comparator with
The anode connection of second crystal diode；
The cathode and the fluctuation filtering mould of the cathode of the first crystal diode and second crystal diode
Second input terminal of block is all connected with.
Further, the fluctuation filtering module includes: the second capacitor, third capacitor, second resistance, 3rd resistor, gold
Belong to oxide semiconductor；
The first end of second capacitor and the first end of the 3rd resistor, the grid of the metal-oxide semiconductor (MOS)
And the output end of the abnormality detection module is all connected with, the second end of 3rd resistor ground connection, the of second capacitor
Two ends ground connection, the source electrode ground connection of the metal-oxide semiconductor (MOS), the drain electrode of the metal-oxide semiconductor (MOS) and described second
The first end of resistance connects, and the first of the second end of the second resistance and the video input module and the third capacitor
End is all connected with, and the second end of the third capacitor with the capacitance C1 for connecting.
Another aspect according to the present invention provides a kind of dynamic filter of dynamic filter device based on vision signal
Method is applied in Analogvideotransmission system, which comprises
The vision signal of input is received, and detects the voltage for making a reservation for the vision signal of the first frequency range in the vision signal
Value, if detecting, the voltage value within a preset range, does not generate first control signal；
According to the first control signal, the vision signal of predetermined second frequency range in the vision signal is filtered out, and will
It filters out the vision signal after the vision signal of predetermined second frequency range and is sent to video input module, wherein predetermined first frequency
Section and predetermined second frequency range are identical or different.
Further, the voltage value for making a reservation for the vision signal of the first frequency range in the detection vision signal, if detection
Not within a preset range to the voltage value, generating first control signal includes:
According to the vision signal of input, the vision signal for making a reservation for the first frequency range in the vision signal is obtained, described in detection
The voltage value of the vision signal of predetermined first frequency range, if detecting, the voltage value within a preset range, does not generate the first control
Signal.
Further, the method also includes:
If detecting the voltage value within a preset range, second control signal is generated；
According to the second control signal, the vision signal is sent directly to the video input module.
The embodiment of the invention provides a kind of dynamic filter device and method based on vision signal is applied to analog video
In Transmission system, described device is respectively used to connect with video input module and capacitance C1, and described device includes: abnormal inspection
Survey module and fluctuation filtering module；The input terminal of the abnormality detection module with the capacitance C1 for connecting, output end
It is connect with the first input end of the fluctuation filtering module；The abnormality detection module, vision signal for receiving input, and
The voltage value for making a reservation for the vision signal of the first frequency range in the vision signal is detected, if detecting the voltage value not in default model
In enclosing, Xiang Suoshu fluctuation filtering module sends first control signal；Second input terminal of the fluctuation filtering module is used for and institute
Capacitance C1 connection is stated, output end with the video input module for connecting；The fluctuation filtering module, it is defeated for receiving
The vision signal entered, and when receiving the first control signal that the abnormality detection module is sent, filter out the vision signal
In predetermined second frequency range vision signal, and the vision signal after the vision signal for filtering out predetermined second frequency range is sent to
The video input module, wherein first frequency range and the second frequency range are identical or different.
The embodiment of the present invention receives the vision signal of input by abnormality detection module, and detects pre- in the vision signal
The voltage value of the vision signal of fixed first frequency range, if detecting the voltage value not within a preset range, Xiang Suoshu fluctuation filtering
Module sends first control signal, and the fluctuation filtering module receives the first control signal, will filter out the video letter
The vision signal of predetermined second frequency range in number, and the vision signal after the vision signal for filtering out predetermined second frequency range is sent
To the video input module, to make a reservation for the voltage of the vision signal of the first frequency range during ensure that video signal transmission
When value is more than preset range, the vision signal of predetermined second frequency range in the vision signal of input is filtered out, vision signal is avoided
Be abnormal, caused by long-time blank screen problem, and whole device will not bring additional fever, be not necessarily to separately installed heat dissipation
It is excessive and the problem of increase hardware cost to avoid system bulk for the radiating elements such as piece.
Detailed description of the invention
Fig. 1 is one of Analogvideotransmission system schematic in the prior art；
Fig. 2 is the two of Analogvideotransmission system schematic in the prior art；
Fig. 3 is the dynamic filter device based on vision signal that provides of the embodiment of the present invention 1 in Analogvideotransmission system
In application schematic diagram；
Fig. 4 is the dynamic filter device based on vision signal that provides of the embodiment of the present invention 2 in Analogvideotransmission system
In application schematic diagram；
Fig. 5 is the electrical block diagram for the dynamic filter device based on vision signal that the embodiment of the present invention 3 provides；
Fig. 6 is the electrical block diagram for the dynamic filter device based on vision signal that the embodiment of the present invention 5 provides；
Fig. 7 is the electrical block diagram for the dynamic filter device based on vision signal that the embodiment of the present invention 6 provides；
Schematic diagram when Fig. 8 is vision signal generation step jump at a, e, b, c each point；
Schematic diagram when step is jumped at a, e, b, c each point does not occur for vision signal for Fig. 9；
Figure 10 is the dynamic filter method signal for the dynamic filter device based on vision signal that the embodiment of the present invention 7 provides
Figure.
Specific embodiment
With reference to the accompanying drawings of the specification, to a kind of dynamic filter device based on vision signal provided in an embodiment of the present invention
And the specific embodiment of method is illustrated.
Embodiment 1:
The embodiment of the invention provides a kind of dynamic filter device based on vision signal is applied to Analogvideotransmission system
In system, as shown in figure 3, the device is respectively used to connect with video input module and capacitance C1, which includes: abnormal inspection
Survey module 31 and fluctuation filtering module 32；
The input terminal of the abnormality detection module 31 for connecting with the capacitance C1, filter by output end and the fluctuation
The first input end of wave module 32 connects；The abnormality detection module 31, vision signal for receiving input, and described in detection
Make a reservation for the voltage value of the vision signal of the first frequency range in vision signal, if detecting the voltage value not within a preset range, to
The fluctuation filtering module 32 sends first control signal；
For connecting with the capacitance C1, output end is used for and institute second input terminal of the fluctuation filtering module 32
State video input module connection；The fluctuation filtering module 32, vision signal for receiving input, and it is described different receiving
When the first control signal that normal detection module 31 is sent, the vision signal of predetermined second frequency range in the vision signal is filtered out,
And the vision signal after the vision signal for filtering out predetermined second frequency range is sent to the video input module, wherein described
One frequency range and the second frequency range are identical or different.
Abnormality detection module 31 is for detecting whether vision signal is abnormal, when vision signal is abnormal, Xiang Bodong
Filter module 32 sends first control signal.Wherein abnormality detection module 31 will test the electricity of the vision signal of predetermined first frequency range
Whether pressure value is in preset range, if the voltage value will send first control signal in preset range.Such as capacitance C1 two
End voltage change, vision signal will occur step jump, due to step jump to compared with low-frequency range vision signal interference compared with
Greatly, so abnormality detection module 31 will test the voltage value of the vision signal compared with low-frequency range, if the voltage value is more than preset range,
Abnormality detection module 31 will determine that vision signal is abnormal, and then send first control signal to fluctuation filtering module 32.
After fluctuation filtering module 32 receives the first control signal of the transmission of abnormality detection module 31, its reception will be filtered out
To vision signal in predetermined second frequency range vision signal.Here making a reservation for the first frequency range can be identical with predetermined second frequency range
Or it is different, since step jump is larger to the vision signal interference compared with low-frequency range, so in order to detect whether vision signal deposits
It is abnormal, the vision signal for predetermined first frequency range that abnormality detection module 31 detects is the vision signal compared with low-frequency range；In order to
The biggish vision signal that is interfered is filtered out, the vision signal for predetermined second frequency range that fluctuation filtering module 32 filters out also is lower
The vision signal of frequency range, preferably, predetermined first frequency range is in predetermined second band limits.
For example, predetermined first frequency range is identical as predetermined second frequency range, if the voltage value of the vision signal of predetermined first frequency range
More than preset range, then it represents that vision signal is abnormal, and the vision signal for making a reservation for the first frequency range in vision signal will be considered as
Abnormal signal, predetermined first frequency range is identical as predetermined second frequency range, and fluctuation filtering module 32, which filters out, makes a reservation for second in vision signal
The vision signal filtered out after abnormal signal is sent video input module by vision signal, that is, abnormal signal of frequency range, thus
Filtering out the vision signal after abnormal signal can be played, and ensure that display screen plays the video letter of video input module storage
Number when, be not in prolonged blank screen, that is to say, that when detect the first frequency range vision signal voltage value be more than predetermined model
It encloses, then filters out the vision signal of first frequency range, certainly when filtering out the vision signal of first frequency range, can also filter out
The vision signal of some other frequency ranges.
The embodiment of the present invention receives the vision signal of input by abnormality detection module 31, and detects in the vision signal
The voltage value of the vision signal of predetermined first frequency range, if detecting, the voltage value within a preset range, is not filtered to the fluctuation
Wave module 32 sends first control signal, and the fluctuation filtering module 32 receives the first control signal, will filter out described
The vision signal of predetermined second frequency range in vision signal, and the video after the vision signal for filtering out predetermined second frequency range is believed
Number it is sent to the video input module, thus during ensure that video signal transmission, the variation of capacitance C1 both end voltage
Vision signal step is caused to be jumped, when making a reservation for the voltage value of the vision signal of the first frequency range more than preset range, fluctuation filtering mould
Block 32 filters out the vision signal of predetermined second frequency range in the vision signal of its input, solves vision signal and is abnormal, in advance
Long-time blank screen problem caused by the doping of the abnormal signal of fixed second frequency range, and the method without using current constant control, keep away
It is excessive and the problem of increase hardware cost system bulk has been exempted from.
Embodiment 2:
Fig. 4 is the dynamic filter device provided in an embodiment of the present invention based on vision signal in Analogvideotransmission system
Application schematic diagram, in order to increase the flexibility of the dynamic filter device based on vision signal, and simplify abnormality detection module
Design, on the basis of the above embodiments, in the embodiment of the present invention, the abnormality detection module includes: isolation filter module 41
With surge detection module 42；
The input terminal of the isolation filter module 41 for connecting with the capacitance C1, examine by output end and the fluctuation
Survey the input terminal connection of module 42；The isolation filter module 41, vision signal for receiving input, and believe from the video
The vision signal of predetermined first frequency range is sent to surge detection module by the vision signal that predetermined first frequency range is obtained in number
42；
The output end of the surge detection module 42 is connect with the fluctuation filtering module 43；The surge detection module
42, for receiving the vision signal for predetermined first frequency range that the isolation filter module 41 is sent, and detect described predetermined
The voltage value of the vision signal of first frequency range, if detecting the voltage value not within a preset range, Xiang Suoshu fluctuation filtering mould
Block 43 sends first control signal.
Since step jump is larger to the vision signal interference compared with low-frequency range, so in order to detect whether vision signal deposits hair
Raw abnormal, the vision signal of predetermined first frequency range of abnormality detection module detection is the vision signal compared with low-frequency range.If predetermined the
Not within a preset range, the fluctuation filtering module 43 sends first control signal to the voltage value of the vision signal of one frequency range.It is different
Normal detection module can directly detect the voltage value of the vision signal of predetermined first frequency range from the vision signal that it is inputted, certainly
The vision signal that predetermined first frequency range can also be obtained from vision signal detects the vision signal of predetermined first frequency range of acquisition
Voltage value.In the embodiment of the present invention in such a way that isolation filter module 41 and surge detection module 42 combine, so that being based on
The dynamic filter device of vision signal is more flexible, and also simplifies the design of abnormality detection module.
Embodiment 3:
Isolation filter module provided by the above embodiment by software realization or can pass through hardware realization, such as Fig. 5
It is shown, hardware realization isolation filter functions of modules can be built in embodiments of the present invention.
The isolation filter module includes: video driver U3, first resistor R4 and first capacitor C3；
For the input terminal of the video driver U3 for connecting with the capacitance C1, the video driver U3's is defeated
Outlet is connect with the first end of the first resistor R4, and the first of the second end of the first resistor R4 and the first capacitor C3
The input terminal of end and the surge detection module is all connected with, the second end ground connection of the first capacitor C3.
Video driver U3 plays the role of that vision signal is isolated and filters the vision signal of predetermined first frequency range,
In, isolation vision signal refers to no matter the vision signal of video driver U3 output end passes through that kind of processing all will not influence view
The vision signal of frequency driver U3 input terminal.Because step jump occurs for vision signal, the vision signal of low-frequency range will be by
Larger interference, so the vision signal for only needing to filter out low-frequency range is detected, first resistor R4 and first capacitor C3
The low-pass filter circuit of composition will filter out the vision signal of default first frequency range, the specific can be that compared with the video of low-frequency range
Signal, and the vision signal for which specific frequency range that low-pass filter circuit can filter out, by the resistance value of first resistor R4 and
The capacitance of one capacitor C3 determines.Low-pass filter circuit is the prior art, and details are not described herein, and the embodiment of the present invention need to only filter out
It will filter out 25 hertz of vision signals below compared with the vision signal of low-frequency range, such as isolation filter module.
With continued reference to Fig. 5, in the embodiment of the present invention, the surge detection module includes: first comparator U1, second compares
Device U2, first crystal diode D1, the second crystal diode D2, the first power Vcc and second source Vdd；
The negative input of the first comparator U1 is connect with first power Vcc, the first comparator U1's
Positive input is all connected with the negative input of the second comparator U2 and the output end of the isolation filter module, institute
The output end for stating first comparator U1 is connect with the anode of the first crystal diode D1；
The positive input of the second comparator U2 is connect with the second source Vdd, the second comparator U2's
Output end is connect with the anode of the second crystal diode D2；
The cathode of the cathode of the first crystal diode D1 and the second crystal diode D2 are filtered with the fluctuation
Second input terminal of wave module connects.
Surge detection module will test the voltage value of the vision signal of predetermined first frequency range, if detecting the voltage value not
Within a preset range, Xiang Suoshu fluctuation filtering module sends first control signal.
The vision signal of the output end of specific isolation filter module is separately input to the positive input of first comparator U1
The negative input at end and the second comparator U2, the voltage value that the first power Vcc provides are greater than the voltage that second source Vdd is provided
Value.If the voltage value of the vision signal of the output end of isolation filter module is greater than the voltage value that the first power Vcc provides, the first ratio
High level signal is exported compared with device U1, the second comparator U2 exports low level signal, then first crystal diode D1 conducting, the second crystalline substance
The output end of body diode D2 cut-off, surge detection module exports high level signal, that is, first control signal.If isolation filter mould
The voltage value of the vision signal of the output end of block exports low electricity less than the voltage value that the first power supply Vdd is provided, first comparator U1
Ordinary mail number, the second comparator U2 export high level signal, then first crystal diode D1 cut-off, the second crystal diode D2 are led
Logical, the output end of surge detection module exports high level signal, that is, first control signal.If the output end of isolation filter module
The voltage value of vision signal is greater than the voltage value that the first power supply Vdd is provided, and the voltage value provided less than the first power Vcc,
First comparator U1 export low level signal, the second comparator U2 export low level signal, then first crystal diode D1 cut-off,
The output end of second crystal diode D2 cut-off, surge detection module exports low level signal.
Therefore the voltage value of first power Vcc and the electricity of second source Vdd can be set according to preset voltage range
Whether pressure value is located at default so that whether the voltage value for detecting the vision signal of predetermined first frequency range is located in preset range
Voltage range in.
Embodiment 4:
When in order to guarantee vision signal no exceptions, the vision signal of predetermined second frequency range will not be filtered out, above-mentioned each
On the basis of embodiment, in the embodiment of the present invention, the abnormality detection module, if being also used to detect the voltage value default
In range, Xiang Suoshu fluctuation filtering module sends second control signal；
The fluctuation filtering module is also used to according to the second control signal, and the vision signal of the input is direct
It is sent to the video input module.
If voltage value within a preset range, illustrates vision signal there is no exception, fluctuation filtering module is not needed pair yet
Vision signal carries out filtering out operation, it is only necessary to which the vision signal received is sent directly to video input module.Guarantee
Vision signal can be transferred to video input module under normal circumstances.
Specifically as described in above-described embodiment, if the voltage value of the vision signal of the output end of isolation filter module is greater than first
The voltage value that power supply Vdd is provided, and the voltage value provided less than the first power Vcc, first comparator U1 export low level letter
Number, the second comparator U2 exports low level signal, then first crystal diode D1 cut-off, the second crystal diode D2 cut-off, wave
The output end of dynamic detection module exports low level signal.Low level, that is, the second control signal, fluctuation filtering module can be at this time
The vision signal of the input is directly sent directly to the video input module.
Embodiment 5:
Specifically, the fluctuation filtering module can by software realization, can also by hardware realization, as shown in fig. 6,
On the basis of the various embodiments described above, the hardware circuit of the dynamic filter device based on vision signal of the embodiment of the present invention shows
It is intended to, the fluctuation filtering module includes: the second capacitor C2, third capacitor C4, second resistance R2,3rd resistor R3, metal oxygen
Compound semiconductor Q1；
The first end of the second capacitor C2 and first end, the metal-oxide semiconductor (MOS) Q1 of the 3rd resistor R3
Grid and the output end of the abnormality detection module be all connected with, the second end ground connection of the 3rd resistor R3, described second
The second end of capacitor C2 is grounded, the source electrode ground connection of the metal-oxide semiconductor (MOS) Q1, the metal-oxide semiconductor (MOS) Q1's
Drain electrode is connect with the first end of the second resistance R2, the second end of the second resistance R2 and the video input module and
The first end of the third capacitor C4 is all connected with, and the second end of the third capacitor C4 with the capacitance C1 for connecting.
If step jump occurs for vision signal, make a reservation for the voltage value of the vision signal of the first frequency range not within a preset range,
Abnormality detection module will send first control signal to fluctuation filtering module.
Fluctuation filtering module receives first control signal, will make a reservation for the view of the second frequency range in the vision signal for filtering out input
Vision signal after filtering out is sent to the video input module by frequency signal.Such as first control signal is high level letter
Number, then metal-oxide semiconductor (MOS) Q1 is connected, and third capacitor C4 and second resistance R2 form high-pass filtering circuit, filters out compared with low frequency
The vision signal of section, and the vision signal for specially which frequency range that high-pass filtering circuit can filter out, by second resistance R2's
Resistance value and the capacitance of third capacitor C4 determine that high-pass filtering circuit is the prior art, and details are not described herein, the embodiment of the present invention
Only needed to filter out the vision signal of lower frequency range, such as the vision signal of default first frequency range is 25 hertz of videos below
Signal, then fluctuation filtering module will be crossed and filter out 25 hertz of vision signals below.Then the vision signal after filtering out is sent
To the video input module.
If there is no step jumps for vision signal, the voltage value for making a reservation for the vision signal of the first frequency range also will be in default model
In enclosing, abnormality detection module will send second control signal to fluctuation filtering module.
Fluctuation filtering module receives second control signal, and the vision signal of input is sent directly to the video input
Module.Such as second control signal is low level signal, then metal-oxide semiconductor (MOS) Q1 ends, the electricity of third capacitor C4 and second
Resistance R2 will not form low-pass filter circuit, and third capacitor C4 only has the effect of blocking, so fluctuation filtering module, by input
Vision signal is sent directly to the video input module.
Embodiment 6:
As shown in fig. 7, be the circuit structure diagram of the dynamic filter device provided in an embodiment of the present invention based on vision signal,
The device is applied in Analogvideotransmission system shown in FIG. 1, and connects respectively with capacitance C1 and video input module
It connects.
The device includes: isolation filter module, surge detection module and fluctuation filtering module, wherein isolation filter module packet
It includes: video driver U3, first resistor R4 and first capacitor C3；Surge detection module includes: first comparator U1, second compares
Device U2, first crystal diode D1, the second crystal diode D2, the first power Vcc and second source Vdd；Fluctuation filtering module
It include: the second capacitor C2, third capacitor C4, second resistance R2,3rd resistor R3, metal-oxide semiconductor (MOS) Q1；
The input terminal of video driver U3 with capacitance C1 for connecting, the output end of video driver U3 and the first electricity
The first end connection of R4 is hindered, the second end of first resistor R4 and first end, the forward direction of first comparator U1 of first capacitor C3 are defeated
The negative input for entering end and the second comparator U2 is all connected with, and the second end ground connection of first capacitor C3, first comparator U1's is negative
It being connect to input terminal with the first power Vcc, the output end of first comparator U1 is connect with the anode of first crystal diode D1, the
The positive input of two comparator U2 is connect with second source Vdd, the output end and the second crystal diode of the second comparator U2
The first of the cathode of the anode connection of D2, the cathode of the second crystal diode D2 and first crystal diode D1,3rd resistor R3
The grid at end, the first end of the second capacitor C2 and metal-oxide semiconductor (MOS) Q1 is all connected with, the second termination of 3rd resistor R3
Ground, the second end ground connection of the second capacitor C2, the source electrode ground connection of metal-oxide semiconductor (MOS) Q1, the leakage of metal-oxide semiconductor (MOS) Q1
Pole is connect with the first end of second resistance R2, the second end and video input module and the third capacitor C4 of second resistance R2
First end be all connected with, the second end of third capacitor C4 with capacitance C1 for connecting.
If the power loaded in Analogvideotransmission system changes, the voltage at the both ends capacitance C1 becomes
Change, vision signal is by occurring step jump after capacitance C1, when the vision signal that step jump occurs is driven by video
Dynamic device U3, and after the low-pass filter circuit filtering for passing through first resistor R4 and first capacitor C3 composition, it leaves behind compared with low-frequency range
Vision signal, i.e., the vision signal of default first frequency range, such as because step jump occurs for vision signal, in vision signal
Relatively low-frequency range vision signal interference it is larger, adulterate these vision signal quilts by the low-frequency range vision signal of larger interference
When broadcasting, it may occur that long-time blank screen, so only needing to detect the voltage value of the vision signal compared with low-frequency range, according to existing
The resistance value of first resistor R4 and the capacitance of first capacitor C3, the cutoff frequency of the low-pass filter circuit formed is arranged in technology
Be set as 25 hertz, after the low-pass filter circuit, at the second end of first resistor R4 only be left 25 hertz it is below
Vision signal.The voltage value and the second source Vdd voltage value provided that first power Vcc provides are respectively the upper of preset range
Limit and lower limit, if being more than the voltage value that the first power Vcc provides by the voltage value of the vision signal after low-pass filter circuit,
Then first comparator U1 exports high level signal, and the second comparator U2 exports low level signal, and the second crystal diode D2 ends,
First crystal diode D1 conducting.
The high level signal of first comparator U1 output reaches metal-oxide semiconductor (MOS) by first crystal diode D1
The grid of Q1, then metal-oxide semiconductor (MOS) Q1 is connected, and second resistance R2 and third capacitor R4 form high-pass filtering circuit, filters out
Make a reservation for the vision signal of the second frequency range in the vision signal of input, such as because step jump occurs for vision signal, video is believed
The vision signal interference of relatively low-frequency range in number is larger, and adulterates these views by the low-frequency range vision signal of larger interference
When frequency signal is played, it may occur that long-time blank screen, so only needing to filter out the low-frequency range vision signal by larger interference
, the resistance value of second resistance R2 and the capacitance of third capacitor C4, the high-pass filtering formed are set according to the prior art
The cutoff frequency of circuit is set as 25 hertz, filters out 25 hertz of vision signals below in the vision signal of input.
During being gradually restored to primary voltage with the voltage of the close video input module side of capacitance C1, when
When the voltage value of vision signal after low-frequency filter circuit is within preset range, the ratio of first comparator U1 and second
Low level signal is exported compared with device U2, first crystal diode D1 and the second crystal diode D2 are turned off, then metal oxide
Semiconductor Q1 is also switched off, and second resistance R2 and third capacitor C4 cannot form high-pass filtering circuit, and third capacitor C4 is only played
The effect of blocking, vision signal is by being again directly transferred to Video Output Modules through third capacitor C4 after capacitance C1.
Referring to the schematic diagram that Fig. 8, Fig. 8 are when vision signal generation step is jumped in Fig. 7 at a, e, b, c each point.Video
The vision signal of exceptions area cannot be received and be played by video input apparatus, will appear when to playing vision signal prolonged
Blank screen phenomenon, the vision signal in the normal area of video can be received and be played by video input apparatus, be not in that blank screen is existing
As Fig. 8 is that a point video signal video exceptions area, view corresponding with the point video exceptions area a in corresponding e point video signal occurs
The voltage value of frequency signal is more than the voltage value that the first power Vcc provides, and corresponding b point is more than the first power supply with e point voltage value
The corresponding part of voltage value that Vcc is provided is high level signal, the area corresponding with b point output high level signal of corresponding c point
Domain becomes the normal area of video from video exceptions area, reduces video exceptions area, while also reducing display and playing vision signal
When blank screen time, it is excessive and increase hardware cost to avoid system bulk and the method without using current constant control
Problem.
Referring to Fig. 9, schematic diagram when step is jumped in Fig. 7 at a, e, b, c each point does not occur for vision signal for Fig. 9.Depending on
The normal area of frequency is identical as the normal area of the video in Fig. 8, and details are not described herein, and there is no video is different in transmission process for vision signal
Normal area.
Embodiment 7:
It as shown in Figure 10, is the dynamic filter side of the dynamic filter device provided in an embodiment of the present invention based on vision signal
Method schematic diagram, applied to the Analogvideotransmission system including the above-mentioned dynamic filter device based on vision signal, this method packet
It includes:
S101: receiving the vision signal of input, and detects the vision signal for making a reservation for the first frequency range in the vision signal
Voltage value, if detecting, the voltage value within a preset range, does not generate first control signal.
S102: according to the first control signal, filtering out the vision signal of predetermined second frequency range in the vision signal,
And the vision signal after the vision signal for filtering out predetermined second frequency range is sent to video input module, wherein first frequency
Section and the second frequency range are identical or different.
Here making a reservation for the first frequency range can be same or different with predetermined second frequency range, since step is jumped to compared with low-frequency range
Vision signal interference it is larger, be abnormal so whether depositing to detect vision signal, the view of predetermined first frequency range of detection
Frequency signal is the vision signal compared with low-frequency range；In order to filter out the biggish vision signal that is interfered, predetermined second frequency range filtered out
Vision signal be also vision signal compared with low-frequency range, preferably, predetermined first frequency range is in the predetermined second frequency range model
In enclosing.For example, predetermined first frequency range is identical as predetermined second frequency range, if the voltage value of the vision signal of predetermined first frequency range is more than
Preset range, then it represents that vision signal is abnormal, and the vision signal for making a reservation for the first frequency range in vision signal will be considered as abnormal
Signal, predetermined first frequency range is identical as predetermined second frequency range, and the vision signal for filtering out predetermined second frequency range in vision signal is i.e. different
Regular signal sends video input module for the vision signal filtered out after abnormal signal, thus after filtering out abnormal signal
Vision signal can be played, when ensure that display screen plays the vision signal of video input module storage, when being not in long
Between blank screen, that is to say, that when detect the first frequency range vision signal voltage value be more than preset range, then by first frequency range
Vision signal filter out, certainly when filtering out the vision signal of first frequency range, the view of some other frequency ranges can also be filtered out
Frequency signal.
The embodiment of the present invention detects by receiving the vision signal inputted and makes a reservation for the first frequency range in the vision signal of input
The voltage value of vision signal whether within a preset range, so that it is determined that input vision signal whether be abnormal.If predetermined the
The voltage value of the vision signal of one frequency range is not within a preset range, then it represents that the vision signal of input is abnormal, and generates first
Signal is controlled, and according to the first control signal, the vision signal for making a reservation for the second frequency range in the vision signal of input is filtered out,
And the vision signal after the vision signal for filtering out predetermined second frequency range is sent to video input module.To ensure that video
In signals transmission, the variation of capacitance C1 both end voltage causes vision signal step to be jumped, and makes a reservation for the video of the first frequency range
When the voltage value of signal is more than preset range, the vision signal of predetermined second frequency range in the vision signal of input is filtered out, is solved
Vision signal is abnormal, and makes a reservation for long-time blank screen problem caused by the doping of the abnormal signal of the second frequency range, and do not have
Using the method for current constant control, it is excessive and the problem of increase hardware cost to avoid system bulk.
Embodiment 8:
On the basis of the various embodiments described above, in the embodiment of the present invention, make a reservation for first in the detection vision signal
The voltage value of the vision signal of frequency range, if detecting the voltage value not within a preset range, generating first control signal includes:
According to the vision signal of input, the vision signal for making a reservation for the first frequency range in the vision signal is obtained, described in detection
The voltage value of the vision signal of predetermined first frequency range, if detecting, the voltage value within a preset range, does not generate the first control
Signal.
According to the vision signal of input, the voltage value for making a reservation for the vision signal of the first frequency range in the vision signal is detected,
The voltage value of the vision signal of predetermined first frequency range can be directly detected from the vision signal of input, naturally it is also possible to from input
Vision signal in obtain the vision signal of predetermined first frequency range, detect the voltage of the vision signal of predetermined first frequency range of acquisition
Value.
Embodiment 9:
When in order to guarantee vision signal no exceptions, the vision signal of predetermined second frequency range will not be filtered out, above-mentioned each
On the basis of embodiment, in the embodiment of the present invention, the method also includes:
If detecting the voltage value within a preset range, second control signal is generated.
According to the second control signal, the vision signal is sent directly to the video input module.
In the embodiment of the present invention, if voltage value within a preset range, illustrates vision signal there is no exception, do not need pair
Vision signal carries out filtering out operation, it is only necessary to which the vision signal received is sent directly to video input module.Guarantee
Vision signal can be transferred to video input module under normal circumstances.
For systems/devices embodiment, since it is substantially similar to the method embodiment, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or an operation are distinguished with another entity or another operation, without necessarily requiring or implying these entities
Or there are any actual relationship or orders between operation.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, the reality of complete hardware embodiment, complete Application Example or connected applications and hardware aspect can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (9)
1. a kind of dynamic filter device based on vision signal is applied in Analogvideotransmission system, which is characterized in that described
Device is respectively used to connect with video input module and capacitance C1, and described device includes: abnormality detection module and fluctuation filter
Wave module；
The input terminal of the abnormality detection module with the capacitance C1 for connecting, output end and the fluctuation filtering module
First input end connection；The abnormality detection module, vision signal for receiving input, and detect in the vision signal
The voltage value of the vision signal of predetermined first frequency range, if detecting, the voltage value within a preset range, is not filtered to the fluctuation
Wave module sends first control signal；
For connecting with the capacitance C1, output end is used for and the video second input terminal of the fluctuation filtering module
Input module connection；The fluctuation filtering module, vision signal for receiving input, and receiving the abnormality detection mould
When the first control signal that block is sent, the vision signal of predetermined second frequency range in the vision signal is filtered out, and will be filtered out pre-
Vision signal after the vision signal of fixed second frequency range is sent to the video input module, wherein first frequency range and the
Two frequency ranges are identical or different.
2. the dynamic filter device based on vision signal as described in claim 1, which is characterized in that the abnormality detection module
It include: isolation filter module and surge detection module；
The input terminal of the isolation filter module with the capacitance C1 for connecting, output end and the surge detection module
Input terminal connection；The isolation filter module, vision signal for receiving input, and obtained in advance from the vision signal
The vision signal of predetermined first frequency range is sent to surge detection module by the vision signal of fixed first frequency range；
The output end of the surge detection module is connect with the fluctuation filtering module；The surge detection module, for receiving
The vision signal for predetermined first frequency range that the isolation filter module is sent, and detect the video of predetermined first frequency range
The voltage value of signal, if detecting the voltage value not within a preset range, Xiang Suoshu fluctuation filtering module sends the first control
Signal.
3. the dynamic filter device based on vision signal as described in claim 1, which is characterized in that the abnormality detection mould
Block, if being also used to detect the voltage value within a preset range, Xiang Suoshu fluctuation filtering module sends second control signal；
The fluctuation filtering module is also used to be directly transmitted the vision signal of the input according to the second control signal
To the video input module.
4. the dynamic filter device based on vision signal as claimed in claim 2, which is characterized in that the isolation filter module
It include: video driver, first resistor and first capacitor；
The input terminal of the video driver with the capacitance C1 for connecting, the output end of the video driver and institute
State the first end connection of first resistor, the first end and the fluctuation of the second end of the first resistor and the first capacitor
The input terminal of detection module is all connected with, the second end ground connection of the first capacitor.
5. the dynamic filter device based on vision signal as claimed in claim 2, which is characterized in that the surge detection module
It include: first comparator, the second comparator, first crystal diode, the second crystal diode, the first power supply and second source；
The negative input of the first comparator is connect with first power supply, the positive input of the first comparator with
The negative input of second comparator and the output end of the isolation filter module are all connected with, the first comparator
Output end is connect with the anode of the first crystal diode；
The positive input of second comparator is connect with the second source, the output end of second comparator with it is described
The anode connection of second crystal diode；
The cathode and the fluctuation filtering module of the cathode of the first crystal diode and second crystal diode
Second input terminal is all connected with.
6. the dynamic filter device based on vision signal as described in claim 1, which is characterized in that the fluctuation filtering module
It include: the second capacitor, third capacitor, second resistance, 3rd resistor, metal-oxide semiconductor (MOS)；
The first end of the first end of second capacitor and the 3rd resistor, the metal-oxide semiconductor (MOS) grid and
The output end of the abnormality detection module is all connected with, the second end ground connection of the 3rd resistor, the second end of second capacitor
Ground connection, the source electrode ground connection of the metal-oxide semiconductor (MOS), the drain electrode of the metal-oxide semiconductor (MOS) and the second resistance
First end connection, the second end of the second resistance and the first end of the video input module and the third capacitor are equal
Connection, the second end of the third capacitor with the capacitance C1 for connecting.
7. a kind of dynamic filter method of the dynamic filter device based on vision signal is applied in Analogvideotransmission system,
It is characterized in that, described device is respectively used to connect with video input module and capacitance C1, described device includes: abnormal inspection
Survey module and fluctuation filtering module；The input terminal of the abnormality detection module with the capacitance C1 for connecting, output end
It is connect with the first input end of the fluctuation filtering module；Second input terminal of the fluctuation filtering module is used for and the blocking
Capacitor C1 connection, output end with the video input module for connecting；The described method includes:
The vision signal of input is received, and detects the voltage value for making a reservation for the vision signal of the first frequency range in the vision signal, if
Detect that the voltage value within a preset range, does not generate first control signal；
According to the first control signal, the vision signal of predetermined second frequency range in the vision signal is filtered out, and will be filtered out
Vision signal after the vision signal of predetermined second frequency range is sent to video input module, wherein predetermined first frequency range and
Predetermined second frequency range is identical or different.
8. dynamic filter method as claimed in claim 7, which is characterized in that make a reservation for first in the detection vision signal
The voltage value of the vision signal of frequency range, if detecting the voltage value not within a preset range, generating first control signal includes:
According to the vision signal of input, the vision signal for making a reservation for the first frequency range in the vision signal is obtained, is detected described predetermined
The voltage value of the vision signal of first frequency range, if detecting, the voltage value within a preset range, does not generate first control signal.
9. dynamic filter method as claimed in claim 7, which is characterized in that the method also includes:
If detecting the voltage value within a preset range, second control signal is generated；
According to the second control signal, the vision signal is sent directly to the video input module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608710.6A CN107483773B (en) | 2017-07-24 | 2017-07-24 | A kind of dynamic filter device and method based on vision signal |
| EP17914749.1A EP3635948A4 (en) | 2017-06-21 | 2017-12-29 | System and method for mixed transmission of signals and power supply through a single cable |
| PCT/CN2017/119762 WO2018233268A1 (en) | 2017-06-21 | 2017-12-29 | System and method for mixed transmission of signals and power supply through a single cable |
| US16/708,487 US11196408B2 (en) | 2017-06-21 | 2019-12-10 | System and method for mixed transmission of signals and power supply through a single cable |
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| CN201710608710.6A CN107483773B (en) | 2017-07-24 | 2017-07-24 | A kind of dynamic filter device and method based on vision signal |
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| WO2018233268A1 (en) | 2017-06-21 | 2018-12-27 | Zhejiang Dahua Technology Co., Ltd. | System and method for mixed transmission of signals and power supply through a single cable |
| CN109870950A (en) * | 2019-01-16 | 2019-06-11 | 金卡智能集团股份有限公司 | A kind of control system based on GPRS communication |
| CN113411534B (en) * | 2021-06-15 | 2022-11-18 | 杭州海康机器人股份有限公司 | Power supply input and output device and video transmission system |
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