CN107483773A - 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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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, and applied in Analogvideotransmission system, the device is respectively used to be connected with video input module and capacitance C1, and the device includes：Abnormality detection module, for receiving the vision signal of input, and the magnitude of voltage for the vision signal for making a reservation for the first frequency range in vision signal is detected, magnitude of voltage within a preset range, the first control signal is not sent to fluctuation filtering module if detecting；Fluctuation filtering module, for receiving the vision signal of 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 that will filter out predetermined second frequency range is sent to video input module.The embodiment of the present invention avoid vision signal occur it 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 filter based on vision signal
Wave apparatus and method.
Background technology
In Analogvideotransmission system, there is a kind of function, be called supply power coaxially function.The purpose of the function, being will be straight
Power supply signal and video signal mixture transmission are flowed, is constructed with simplifying, as shown in figure 1, Video Output Modules are coaxially positive to give video
Input module provides vision signal, and video input module coaxially provides power supply signal back to Video Output Modules.
Equivalent isolation resistance can avoid vision signal from being directly powered voltage or by electric loading attenuation by absorption, and reduce
The dc-decay of dc source.When the power of load changes (such as：Open infrared, zoom etc.), capacitance C1 and C2 two
The voltage at end will also change, so that step jump occurs by C1 and C2 vision signal, C1 is close to video input
Voltage of the voltage and C2 of module side close to Video Output Modules side, which will pass through, to be lot more time to return to itself
Primary voltage.During voltage recovers, vision signal is constantly in step jump state, causes whole vision signal abnormal,
Video input module can not receive anomalous video signal, so as to which the vision signal that display screen receives to video input module shows
When showing, it will blank screen occur.The cycle of the relatively low 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, the most frequently used method is exactly to be further added by a constant-current control module, such as Fig. 2 in Fig. 1
Shown, constant-current control module is mainly ensuring that in the changed power of load, for prime electric power 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, for supply side, one 5 watts of load is equivalent to, when system load becomes 4 watt-hours, constant current by 2 watts
Control is adjusted to 1 watt by 3 watts of consumption, ensures that 5 watts of total power consumption is constant, that is, for electric power system, total work
Consume constant, the electric current between two equivalent isolation resistances will not also change, and the voltage at C1 and C2 both ends will not also change, so as to press down
The generation of abnormal signal processed, solve display screen and the video data for adulterating abnormal signal is shown, the problem of long-time blank screen.
But the method for using current constant control, because constant-current control module needs extra power consumption, and add whole
The thermal gauge lattice of system, and extra power consumption is bigger, and system is hotter, also needs to increase the servicing units such as fin to radiate.
The content of the invention
The present invention provides a kind of dynamic filter device and method based on vision signal, to solve to simulate in the prior art
Video transmission system avoids the extremely caused blank screen problem of vision signal, and caused whole system heating is high, adds fin
Deng servicing unit, caused by system bulk it is excessive the problem of.
In order to solve the above problems, according to the embodiments of the invention provide a kind of dynamic filter dress based on vision signal
Put, applied in Analogvideotransmission system, described device is respectively used to be connected with video input module and capacitance C1, institute
Stating device includes：Abnormality detection module and fluctuation filtering module；
The input of the abnormality detection module is used to be connected with the capacitance C1, output end and the fluctuation filtering
The first input end connection of module；The abnormality detection module, for receiving the vision signal of input, and detect the video letter
Make a reservation for the magnitude of voltage of the vision signal of the first frequency range in number, if the magnitude of voltage is detected not within a preset range, to the ripple
Dynamic filtration module sends the first control signal；
Second input of the fluctuation filtering module be used for be connected with the capacitance C1, output end for it is described
Video input module connects；The fluctuation filtering module, for receiving the vision signal of 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 of the isolation filter module is used to be connected with the capacitance C1, output end and the surge detection
The input connection of module；The isolation filter module, for receiving the vision signal of input, and obtained from the vision signal
The vision signal of predetermined first frequency range is taken, the vision signal of predetermined first frequency range is sent to surge detection module；
The output end of the surge detection module is connected 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 magnitude of voltage of vision signal, if detecting, the magnitude of voltage within a preset range, first is not sent to the fluctuation filtering module
Control signal.
Further, the abnormality detection module, if being additionally operable to detect the magnitude of voltage within a preset range, to described
Fluctuation filtering module sends the second control signal；
The fluctuation filtering module, it is additionally operable to according to second control signal, the vision signal of the input is direct
Send to the video input module.
Further, the isolation filter module includes：Video driver, first resistor and the first electric capacity；
The input of the video driver is used to be connected with the capacitance C1, the output end of the video driver
It is connected with the first end of the first resistor, the first end of the second end of the first resistor and first electric capacity and described
The input of surge detection module is all connected with, the second end ground connection of first electric capacity.
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 connected 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 connected with the positive pole of the first crystal diode；
The positive input of second comparator is connected with the second source, the output end of second comparator with
The positive pole connection of second crystal diode；
Negative pole and the fluctuation filtering mould of the negative pole of the first crystal diode with second crystal diode
Second input of block is all connected with.
Further, the fluctuation filtering module includes：Second electric capacity, the 3rd electric capacity, second resistance, 3rd resistor, gold
Belong to oxide semiconductor；
The first end of second electric capacity 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 electric capacity
Two ends are grounded, the source ground of the metal-oxide semiconductor (MOS), the drain electrode of the metal-oxide semiconductor (MOS) and described second
The first of the first end connection of resistance, the second end of the second resistance and the video input module and the 3rd electric capacity
End is all connected with, and the second end of the 3rd electric capacity is used to be connected with the capacitance C1.
According to it is still another aspect of the present invention to provide a kind of dynamic filter of the dynamic filter device based on vision signal
Method, applied in Analogvideotransmission system, methods described includes：
The vision signal of input is received, and detects the voltage for the vision signal for making a reservation for the first frequency range in the vision signal
Value, if detecting, the magnitude of voltage within a preset range, does not generate the first control signal；
According to first control signal, the vision signal for making a reservation for the second frequency range in the vision signal is filtered out, and will
Filter out the vision signal after the vision signal of predetermined second frequency range to send to video input module, wherein predetermined first frequency
Section and predetermined second frequency range are identical or different.
Further, the magnitude of voltage of the vision signal of the first frequency range is made a reservation in the detection vision signal, if detection
To the magnitude of voltage not within a preset range, the first control signal of generation 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 magnitude of voltage of the vision signal of predetermined first frequency range, if detecting, the magnitude of voltage within a preset range, does not generate the first control
Signal.
Further, methods described also includes：
If detecting the magnitude of voltage within a preset range, the second control signal is generated；
According to second control signal, the vision signal is sent directly to the video input module.
The embodiments of the invention provide a kind of dynamic filter device and method based on vision signal, applied to analog video
In Transmission system, described device is respectively used to be connected with video input module and capacitance C1, and described device includes：Abnormal inspection
Survey module and fluctuation filtering module；The input of the abnormality detection module is used to be connected with the capacitance C1, output end
It is connected with the first input end of the fluctuation filtering module；The abnormality detection module, for receiving the vision signal of input, and
The magnitude of voltage for the vision signal for making a reservation for the first frequency range in the vision signal is detected, if detecting the magnitude of voltage not in default model
In enclosing, the first control signal is sent to the fluctuation filtering module；Second input of the fluctuation filtering module is used for and institute
Capacitance C1 connections are stated, output end is used to be connected with the video input module；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 that predetermined second frequency range will be filtered out send 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 magnitude of voltage of the vision signal of fixed first frequency range, if the magnitude of voltage is detected not within a preset range, to the fluctuation filtering
Module sends the first control signal, and the fluctuation filtering module receives 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, so as to it ensure that video signal transmission during, make a reservation for the voltage of the vision signal of the first frequency range
When value exceedes preset range, the vision signal of predetermined second frequency range in the vision signal of input is filtered out, avoids vision signal
Generation is abnormal, caused by long-time blank screen problem, and whole device will not bring extra heating, without separately installed radiating
The radiating elements such as piece, it is excessive and the problem of increase hardware cost to avoid system bulk.
Brief description of the drawings
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 of the offer 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 of the offer 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；
Fig. 8 is that the schematic diagram at a, e, b, c each point when step is jumped occurs for vision signal；
Fig. 9 is that the schematic diagram at a, e, b, c each point when step is jumped does not occur for vision signal；
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.
Embodiment
With reference to Figure of description, to a kind of dynamic filter device based on vision signal provided in an embodiment of the present invention
And the embodiment of method illustrates.
Embodiment 1：
The embodiments of the invention provide a kind of dynamic filter device based on vision signal, applied to Analogvideotransmission system
In system, as shown in figure 3, the device is respectively used to be connected with video input module and capacitance C1, the device includes：Abnormal inspection
Survey module 31 and fluctuation filtering module 32；
The input of the abnormality detection module 31 is used to be connected with the capacitance C1, and output end is filtered with the fluctuation
The first input end connection of ripple module 32；The abnormality detection module 31, for receiving the vision signal of input, and described in detection
Make a reservation for the magnitude of voltage of the vision signal of the first frequency range in vision signal, if detecting the magnitude of voltage not within a preset range, to
The fluctuation filtering module 32 sends the first control signal；
Second input of the fluctuation filtering module 32 is used to be connected with the capacitance C1, and output end is used for and institute
State video input module connection；The fluctuation filtering module 32, for receiving the vision signal of input, and it is described different receiving
During 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 that will filter 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 used to detect whether vision signal occurs exception, when vision signal generation exception, to fluctuation
Filtration module 32 sends the first control signal.Wherein abnormality detection module 31 will detect the electricity of the vision signal of predetermined first frequency range
Whether pressure value is in preset range, if the magnitude of voltage in preset range, will send the first control signal.Such as capacitance C1 two
Terminal voltage changes, vision signal will occur step jump, due to step jump to compared with low-frequency range vision signal interference compared with
Greatly, thus abnormality detection module 31 by detect compared with low-frequency range vision signal magnitude of voltage, if the magnitude of voltage exceedes preset range,
It is abnormal that abnormality detection module 31 will judge that vision signal occurs, and then send the 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 with identical with predetermined second frequency range
Or it is different, because step jump is larger to the vision signal interference compared with low-frequency range, so in order to detect whether vision signal deposits
Generation is abnormal, and 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 larger vision signal that is interfered is filtered out, the vision signal for predetermined second frequency range that fluctuation filtering module 32 filters out is also to be relatively low
The vision signal of frequency range, it is preferred that predetermined first frequency range is in predetermined second band limits.
For example, predetermined first frequency range is identical with predetermined second frequency range, if the magnitude of voltage of the vision signal of predetermined first frequency range
More than preset range, then it represents that exception occurs for vision signal, makes a reservation for the vision signal of the first frequency range in vision signal and will be considered as
Abnormal signal, predetermined first frequency range is identical with predetermined second frequency range, and fluctuation filtering module 32, which filters out, makes a reservation for second in vision signal
The vision signal of frequency range is abnormal signal, and the vision signal filtered out after abnormal signal is sent into video input module, so as to
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 the magnitude of voltage of vision signal for detecting the first frequency range exceedes predetermined model
Enclose, then filter 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 magnitude of voltage of the vision signal of predetermined first frequency range, if detecting, the magnitude of voltage within a preset range, is not filtered to the fluctuation
Ripple module 32 sends the first control signal, and the fluctuation filtering module 32 receives 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 send to the video input module, so as to it ensure that video signal transmission during, the change of capacitance C1 both end voltages
Vision signal step is caused to be jumped, when the magnitude of voltage of the vision signal of predetermined first frequency range exceedes 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 exception occurs, in advance
Long-time blank screen problem caused by the doping of the abnormal signal of fixed second frequency range, and without the method 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 above-described embodiment, in the embodiment of the present invention, the abnormality detection module includes：Isolation filter module 41
With surge detection module 42；
The input of the isolation filter module 41 is used to be connected with the capacitance C1, and output end is examined with the fluctuation
Survey the input connection of module 42；The isolation filter module 41, believe for receiving the vision signal of input, and from the video
The vision signal of predetermined first frequency range is obtained in number, the vision signal of predetermined first frequency range is sent to surge detection module
42；
The output end of the surge detection module 42 is connected with the fluctuation filtering module 43；The surge detection module
42, the vision signal of predetermined first frequency range sent for receiving the isolation filter module 41, and detect described predetermined
The magnitude of voltage of the vision signal of first frequency range, if the magnitude of voltage is detected not within a preset range, to the fluctuation filtering mould
Block 43 sends the first control signal.
Because 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 the first control signal to the magnitude of voltage of the vision signal of one frequency range.It is different
Normal detection module can directly detect the magnitude of voltage of the vision signal of predetermined first frequency range from the vision signal of its input, certainly
The vision signal of predetermined first frequency range can also be obtained from vision signal, detects the vision signal of predetermined first frequency range of acquisition
Magnitude of voltage.In the embodiment of the present invention by way of isolation filter module 41 and surge detection module 42 combine so that be based on
The dynamic filter device of vision signal is more flexible, and also simplify the design of abnormality detection module.
Embodiment 3：
Above-described embodiment provide isolation filter module can by software realize can also be realized by hardware, such as Fig. 5
It is shown, hardware can be built in embodiments of the present invention realizes isolation filter functions of modules.
The isolation filter module includes：Video driver U3, first resistor R4 and the first electric capacity C3；
The input of the video driver U3 is used to be connected with the capacitance C1, and the video driver U3's is defeated
Go out end to be connected with the first end of the first resistor R4, the second end of the first resistor R4 and the first of the first electric capacity C3
The input of end and the surge detection module is all connected with, the second end ground connection of the first electric capacity C3.
Video driver U3 serves the effect of the vision signal of isolation vision signal and predetermined first frequency range of filtering, its
In, isolation vision signal refers to no matter the vision signal of video driver U3 output ends regards by what kind of processing all without influence
The vision signal of frequency driver U3 inputs.Because step jump occurs for vision signal, the vision signal of its 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 the first electric capacity C3
The low-pass filter circuit of composition, will filter out the vision signal of default first frequency range, can be specifically the video compared with low-frequency range
Signal, and the vision signal for which specific frequency range that low-pass filter circuit can filter out, by first resistor R4 resistance and
One electric capacity C3 capacitance determines.Low-pass filter circuit is prior art, be will not be repeated here, and the embodiment of the present invention need to only filter out
Less than 25 hertz of vision signal is will filter out 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 are compared
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 connected 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 connected with the positive pole of the first crystal diode D1；
The positive input of the second comparator U2 is connected with the second source Vdd, the second comparator U2's
Output end is connected with the positive pole of the second crystal diode D2；
The negative pole of the negative pole of the first crystal diode D1 and the second crystal diode D2 is filtered with the fluctuation
The second input connection of ripple module.
Surge detection module will detect the magnitude of voltage of the vision signal of predetermined first frequency range, if detecting the magnitude of voltage not
Within a preset range, the first control signal is sent to the fluctuation filtering module.
The vision signal of the output end of specific isolation filter module is separately input to first comparator U1 positive input
End and the second comparator U2 negative input, the magnitude of voltage that the first power Vcc provides are more than the voltage that second source Vdd is provided
Value.If the magnitude of voltage of the vision signal of the output end of isolation filter module is more than the magnitude of voltage 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 conductings, the second crystalline substance
Body diode D2 ends, and the output end output high level signal of surge detection module is the first control signal.If isolation filter mould
The magnitude of voltage of the vision signal of the output end of block is less than the magnitude of voltage that the first power supply Vdd is provided, and first comparator U1 exports low electricity
Ordinary mail number, the second comparator U2 output high level signals, then first crystal diode D1 cut-offs, the second crystal diode D2 are led
Logical, the output end output high level signal of surge detection module is the first control signal.If the output end of isolation filter module
The magnitude of voltage of vision signal is more than the magnitude of voltage that the first power supply Vdd is provided, and the magnitude of voltage provided less than the first power Vcc,
First comparator U1 export low level signal, the second comparator U2 output low level signal, then first crystal diode D1 cut-off,
Second crystal diode D2 ends, the output end output low level signal of surge detection module.
Therefore the magnitude of voltage of first power Vcc and second source Vdd electricity can be set according to default voltage range
Pressure value, so as to detect the magnitude of voltage of the vision signal of predetermined first frequency range whether in preset range, i.e., whether positioned at default
Voltage range in.
Embodiment 4：
During in order to ensure 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 additionally operable to detect the magnitude of voltage default
In the range of, send the second control signal to the fluctuation filtering module；
The fluctuation filtering module, it is additionally operable to according to second control signal, the vision signal of the input is direct
Send to the video input module.
If magnitude of voltage within a preset range, illustrates that exception does not occur for vision signal, fluctuation filtering module is also without right
Vision signal is carried out filtering out operation, it is only necessary to which the vision signal received is sent directly into video input module.Ensure
Vision signal can be transferred to video input module under normal circumstances.
Specifically as described in above-mentioned embodiment, if the magnitude of voltage of the vision signal of the output end of isolation filter module is more than first
The magnitude of voltage that power supply Vdd is provided, and the magnitude of voltage provided less than the first power Vcc, first comparator U1 output low level letters
Number, the second comparator U2 output low level signals, then first crystal diode D1 cut-offs, the second crystal diode D2 cut-offs, ripple
The output end output low level signal of dynamic detection module.The low level is the second control signal, and now fluctuation filtering module can be with
The vision signal of the input is directly sent directly to the video input module.
Embodiment 5：
Specifically, the fluctuation filtering module can be realized by software, can also be realized by hardware, 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：Second electric capacity C2, the 3rd electric capacity C4, second resistance R2,3rd resistor R3, metal oxygen
Compound semiconductor Q1；
The first end of the second electric capacity C2 and the first end of the 3rd resistor R3, the metal-oxide semiconductor (MOS) Q1
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
Electric capacity C2 the second end ground connection, the source ground of the metal-oxide semiconductor (MOS) Q1, the metal-oxide semiconductor (MOS) Q1's
Drain electrode is connected 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 3rd electric capacity C4 is all connected with, and the second end of the 3rd electric capacity C4 is used to be connected with the capacitance C1.
If step jump occurs for vision signal, make a reservation for the magnitude of voltage of vision signal of the first frequency range not within a preset range,
Abnormality detection module will send the first control signal to fluctuation filtering module.
Fluctuation filtering module receives the first control signal, makes a reservation for regarding for the second frequency range in the vision signal that will filter out input
Frequency signal, the vision signal after filtering out is sent to the video input module.Such as first control signal be high level letter
Number, then metal-oxide semiconductor (MOS) Q1 is turned on, and the 3rd electric capacity C4 and second resistance R2 composition high-pass filtering circuits, is filtered 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 and the 3rd electric capacity C4 capacitance determine that high-pass filtering circuit is prior art, be will not be repeated here, the embodiment of the present invention
Only needed to filter out the vision signal of relatively low frequency range, for example, default first frequency range vision signal be less than 25 hertz video
Signal, then fluctuation filtering module will cross and filter out less than 25 hertz of vision signal.Then the vision signal after filtering out is sent
To the video input module.
If step jump does not occur for vision signal, the magnitude of voltage 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 the second control signal to fluctuation filtering module.
Fluctuation filtering module receives the second control signal, and the vision signal of input is sent directly into the video input
Module.Such as second control signal be low level signal, then metal-oxide semiconductor (MOS) Q1 ends, and the 3rd electric capacity C4 and second is electric
Resistance R2 will not also form low-pass filter circuit, and the 3rd electric capacity 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 the Analogvideotransmission system shown in Fig. 1, and connects respectively with capacitance C1 and video input module
Connect.
The device includes：Isolation filter module, surge detection module and fluctuation filtering module, wherein isolation filter module bag
Include：Video driver U3, first resistor R4 and the first electric capacity C3；Surge detection module includes：First comparator U1, second are compared
Device U2, first crystal diode D1, the second crystal diode D2, the first power Vcc and second source Vdd；Fluctuation filtering module
Including：Second electric capacity C2, the 3rd electric capacity C4, second resistance R2,3rd resistor R3, metal-oxide semiconductor (MOS) Q1；
Video driver U3 input is used to be connected with capacitance C1, video driver U3 output end and the first electricity
Hinder R4 first end connection, first resistor R4 the second end and the first electric capacity C3 first end, first comparator U1 it is positive defeated
The negative input for entering end and the second comparator U2 is all connected with, and the first electric capacity C3 the second end ground connection, first comparator U1's is negative
It is connected to input with the first power Vcc, first comparator U1 output end is connected with first crystal diode D1 positive pole, the
Two comparator U2 positive input is connected with second source Vdd, the second comparator U2 output end and the second crystal diode
D2 positive pole connection, the second crystal diode D2 negative pole and first crystal diode D1 negative pole, the first of 3rd resistor R3
The grid at end, the second electric capacity C2 first end and metal-oxide semiconductor (MOS) Q1 is all connected with, 3rd resistor R3 the second termination
Ground, the second electric capacity C2 the second end ground connection, metal-oxide semiconductor (MOS) Q1 source ground, metal-oxide semiconductor (MOS) Q1 leakage
Pole is connected with second resistance R2 first end, second resistance R2 the second end and video input module and the 3rd electric capacity C4
First end be all connected with, the 3rd electric capacity C4 the second end is used to be connected with capacitance C1.
If the power loaded in Analogvideotransmission system changes, the voltage at capacitance C1 both ends 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 the first electric capacity C3 compositions, leave 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
During broadcasting, it may occur that long-time blank screen, so detection is only needed compared with the magnitude of voltage of the vision signal of low-frequency range, according to existing
Technology sets first resistor R4 resistance and the first electric capacity C3 capacitance, the cut-off frequency of the low-pass filter circuit formed
25 hertz are arranged to, after the low-pass filter circuit, is only left less than 25 hertz at first resistor R4 the second end
Vision signal.The magnitude of voltage and the second source Vdd magnitudes of voltage provided that first power Vcc provides are respectively the upper of preset range
Limit and lower limit, if by the magnitude of voltage of the vision signal after low-pass filter circuit more than the magnitude of voltage that the first power Vcc provides,
Then first comparator U1 exports high level signal, the second comparator U2 output low level signals, and the second crystal diode D2 ends,
First crystal diode D1 is turned on.
The high level signal of first comparator U1 outputs reaches metal-oxide semiconductor (MOS) by first crystal diode D1
Q1 grid, then metal-oxide semiconductor (MOS) Q1 conductings, second resistance R2 and the 3rd electric capacity R4 composition high-pass filtering circuits, are filtered 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 and regarded 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 be filtered out by the low-frequency range vision signal of larger interference
, second resistance R2 resistance and the 3rd electric capacity C4 capacitance, the high-pass filtering formed are set according to prior art
The cut-off frequency of circuit is arranged to 25 hertz, filters out less than 25 hertz in the vision signal of input of vision signal.
During primary voltage being gradually restored to the voltage of capacitance C1 close video input module side, when
When the magnitude of voltage of vision signal after low-frequency filter circuit is within preset range, the ratios 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 the 3rd electric capacity C4 can not form high-pass filtering circuit, and the 3rd electric capacity C4 is simply played
The effect of blocking, vision signal through the 3rd electric capacity C4 after capacitance C1 by being again directly transferred to Video Output Modules.
Referring to Fig. 8, Fig. 8 is the schematic diagram at a, e, b, c each point in the figure 7 when step jump occurs for vision signal.Video
The vision signal of exceptions area can not be received and played by video input apparatus, occur during so as to play vision signal prolonged
Blank screen phenomenon, the vision signal in the normal area of video can be received and played by video input apparatus, be not in that blank screen shows
As, Fig. 8 is, there is video exceptions area in a point video signals, corresponding with a point videos exceptions area in corresponding e point video signals to regard
The magnitude of voltage of frequency signal more than the magnitude of voltage that the first power Vcc provides, corresponding b points with e point magnitudes of voltage more than the first power supply
Part is high level signal corresponding to the magnitude of voltage that Vcc is provided, the area corresponding with b points output high level signal of corresponding c points
Domain is changed into the normal area of video from video exceptions area, reduces video exceptions area, while also reduces display and play vision signal
When blank screen time, and without the method using current constant control, it is excessive and increase hardware cost to avoid system bulk
Problem.
Referring to Fig. 9, Fig. 9 is that the schematic diagram at a, e, b, c each point in the figure 7 during step jump does not occur for vision signal.Depending on
The normal area of frequency is identical with the normal area of the video in Fig. 8, will not be repeated here, and it is different that video is not present in vision signal in transmitting procedure
Normal area.
Embodiment 7：
As shown in Figure 10, it 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 for including the above-mentioned dynamic filter device based on vision signal, this method bag
Include：
S101：The vision signal of input is received, and detects the vision signal for making a reservation for the first frequency range in the vision signal
Magnitude of voltage, if detecting, the magnitude of voltage within a preset range, does not generate the first control signal.
S102：According to first control signal, the vision signal for making a reservation for the second frequency range in the vision signal is filtered out,
And the vision signal after the vision signal that will filter 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 with identical or different, because step is jumped to compared with low-frequency range from predetermined second frequency range
Vision signal interference it is larger, so whether depositing that generation is abnormal to detect vision signal, predetermined first frequency range of detection regards
Frequency signal is the vision signal compared with low-frequency range；In order to filter out the larger vision signal that is interfered, what is filtered out makes a reservation for the second frequency range
Vision signal be also vision signal compared with low-frequency range, it is preferred that predetermined first frequency range is in the predetermined second frequency range model
In enclosing.For example, predetermined first frequency range is identical with predetermined second frequency range, if the magnitude of voltage of the vision signal of predetermined first frequency range exceedes
Preset range, then it represents that exception occurs for vision signal, and making a reservation for the vision signal of the first frequency range in vision signal will be considered as abnormal
Signal, predetermined first frequency range is identical with predetermined second frequency range, and the vision signal for filtering out predetermined second frequency range in vision signal is i.e. different
Regular signal, the vision signal filtered out after abnormal signal is sent to video input module, 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 the magnitude of voltage of vision signal for detecting the first frequency range exceedes preset range, then by first frequency range
Vision signal filter out, certainly when filtering out the vision signal of first frequency range, regarding for 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 magnitude of voltage of vision signal whether within a preset range, so that it is determined that input vision signal whether exception occurs.If predetermined the
The magnitude of voltage of the vision signal of one frequency range is not within a preset range, then it represents that abnormal, generation first occurs for the vision signal of input
Control signal, and according to 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 that will filter out predetermined second frequency range is sent to video input module.So as to ensure that video
In signals transmission, the change of capacitance C1 both end voltages causes vision signal step to be jumped, and makes a reservation for the video of the first frequency range
When the magnitude of voltage of signal exceedes preset range, the vision signal of predetermined second frequency range in the vision signal of input is filtered out, is solved
Long-time blank screen problem caused by the doping of abnormal, to make a reservation for the second frequency range abnormal signal occurs for vision signal, and does 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 magnitude of voltage of the vision signal of frequency range, if detecting the magnitude of voltage not within a preset range, the first control signal of generation 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 magnitude of voltage of the vision signal of predetermined first frequency range, if detecting, the magnitude of voltage within a preset range, does not generate the first control
Signal.
According to the vision signal of input, the magnitude of voltage for the vision signal for making a reservation for the first frequency range in the vision signal is detected,
The magnitude of voltage 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：
During in order to ensure 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, methods described also includes：
If detecting the magnitude of voltage within a preset range, the second control signal is generated.
According to second control signal, the vision signal is sent directly to the video input module.
In the embodiment of the present invention, if magnitude of voltage within a preset range, illustrates that exception does not occur for vision signal, it is not necessary to right
Vision signal is carried out filtering out operation, it is only necessary to which the vision signal received is sent directly into video input module.Ensure
Vision signal can be transferred to video input module under normal circumstances.
For systems/devices embodiment, because it is substantially similar to embodiment of the method, 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 herein, such as first and second or the like relational terms are used merely to a reality
Either an operation makes a distinction body with another entity or another operation, and not necessarily requires or imply these entities
Any this actual relation or order be present between either operating.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use complete hardware embodiment, complete Application Example or the reality of connected applications and hardware aspect
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the application scope.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the application to the application
God and scope.So, if these modifications and variations of the application belong to the scope of the application claim and its equivalent technologies
Within, then the application is also intended to comprising including these changes and modification.
Claims (9)
- A kind of 1. dynamic filter device based on vision signal, applied in Analogvideotransmission system, it is characterised in that described Device is respectively used to be connected with video input module and capacitance C1, and described device includes：Abnormality detection module and fluctuation are filtered Ripple module；The input of the abnormality detection module is used to be connected with the capacitance C1, output end and the fluctuation filtering module First input end connection；The abnormality detection module, for receiving the vision signal of input, and detect in the vision signal The magnitude of voltage of the vision signal of predetermined first frequency range, if detecting, the magnitude of voltage within a preset range, is not filtered to the fluctuation Ripple module sends the first control signal；Second input of the fluctuation filtering module is used to be connected with the capacitance C1, and output end is used for and the video Input module connects；The fluctuation filtering module, for receiving the vision signal of input, and receiving the abnormality detection mould During 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 claimed in claim 1, it is characterised in that the abnormality detection module Including：Isolation filter module and surge detection module；The input of the isolation filter module is used to be connected with the capacitance C1, output end and the surge detection module Input connection；The isolation filter module, for receiving the vision signal of input, and obtained in advance from the vision signal The vision signal of fixed first frequency range, the vision signal of predetermined first frequency range is sent to surge detection module；The output end of the surge detection module is connected 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 magnitude of voltage of signal, if detecting, the magnitude of voltage within a preset range, the first control is not sent to the fluctuation filtering module Signal.
- 3. the dynamic filter device based on vision signal as claimed in claim 1, it is characterised in that the abnormality detection mould Block, if being additionally operable to detect the magnitude of voltage within a preset range, the second control signal is sent to the fluctuation filtering module；The fluctuation filtering module, it is additionally operable to, according to second control signal, the vision signal of the input be directly transmitted To the video input module.
- 4. the dynamic filter device based on vision signal as claimed in claim 2, it is characterised in that the isolation filter module Including：Video driver, first resistor and the first electric capacity；The input of the video driver is used to be connected with the capacitance C1, the output end of the video driver and institute State the first end connection of first resistor, first end and the fluctuation of the second end of the first resistor with first electric capacity The input of detection module is all connected with, the second end ground connection of first electric capacity.
- 5. the dynamic filter device based on vision signal as claimed in claim 2, it is characterised in that the surge detection module Including：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 connected with first power supply, the positive input of the first comparator with The output end of the negative input of second comparator and the isolation filter module is all connected with, the first comparator Output end is connected with the positive pole of the first crystal diode；The positive input of second comparator is connected with the second source, the output end of second comparator with it is described The positive pole connection of second crystal diode；The negative pole and the fluctuation filtering module of the negative pole of the first crystal diode and second crystal diode Second input is all connected with.
- 6. the dynamic filter device based on vision signal as claimed in claim 1, it is characterised in that the fluctuation filtering module Including：Second electric capacity, the 3rd electric capacity, second resistance, 3rd resistor, metal-oxide semiconductor (MOS)；The first end of second electric capacity and the first end of 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 electric capacity Ground connection, the source ground 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 3rd electric capacity are equal Connection, the second end of the 3rd electric capacity are used to be connected with the capacitance C1.
- 7. a kind of dynamic filter method of the dynamic filter device based on vision signal, applied in Analogvideotransmission system, Characterized in that, methods described includes：The vision signal of input is received, and detects the magnitude of voltage for the vision signal for making a reservation for the first frequency range in the vision signal, if Detect that the magnitude of voltage within a preset range, does not generate the first control signal；According to 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, it is characterised in that make a reservation for first in the detection vision signal The magnitude of voltage of the vision signal of frequency range, if detecting the magnitude of voltage not within a preset range, the first control signal of generation 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 magnitude of voltage of the vision signal of first frequency range, if detecting, the magnitude of voltage within a preset range, does not generate the first control signal.
- 9. dynamic filter method as claimed in claim 7, it is characterised in that methods described also includes：If detecting the magnitude of voltage within a preset range, the second control signal is generated；According to second control signal, the vision signal is sent directly to the video input module.
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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 |
| 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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