CN105245856B - The safety monitoring circuit and its circuit design method for having audio collection - Google Patents
The safety monitoring circuit and its circuit design method for having audio collection Download PDFInfo
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- CN105245856B CN105245856B CN201510728419.3A CN201510728419A CN105245856B CN 105245856 B CN105245856 B CN 105245856B CN 201510728419 A CN201510728419 A CN 201510728419A CN 105245856 B CN105245856 B CN 105245856B
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Abstract
The present invention provides a kind of safety monitoring circuits and its circuit design method for having audio collection, pass through the acquisition to all audio signals before input safety defense monitoring system, transmission, processing is that original analog is completed to guarantee the integrality of data to greatest extent, furthermore using in analogue audio frequency processing module has source crystal oscillator, effectively avoid interfering with each other for clock signal and other signals, voice signal after processing still with the transmitting voice signal of simulation to safety monitoring equipment within, for the first time sampling and digital-to-analogue conversion of the side to initial analog voice signal in security device at this time, synchronous coding is realized with HD video, transmission and output, solve the problems, such as that safety monitoring equipment only has HD video to export and can not effectively realize monitored picture scene high definition voice.In addition, power-supply system is subdivided into mutually independent number, simulation duplex feeding, power supply is effectively reduced to the analog signal transmitted in circuit, the interference noise problem of digital signal.
Description
Technical field
The present invention relates to a kind of audio sample circuit, refer in particular to a kind of safety monitoring circuit for having audio collection and its
Circuit design method.
Background technique
Traditional monitoring device is principally dedicated to the reduction to monitoring site video pictures so that some monitoring devices without
The capture of field speech signal and capacity gauge.But with the popularization of monitoring application, the importance of audio collection is also gradually highlighted.
But in existing protection and monitor field, voice collecting and the capture of short distance can only be met having the equipment of voice monitoring,
The slightly remote sound of distance is often or capture completely is smudgy less than voice messaging or the voice messaging captured, cannot
Resolution and audiovisual are carried out, effectively so as to cause the monitored scene of not can completely reduction.
Trace it to its cause be as design of the monitoring device for audio collection it is unreasonable caused by.For example, existing monitoring device
Audio collection use two schemes:
One is direct peripheral hardwares, and microphone is arranged, and microphone enters monitoring device master control core after being conveyed directly to A/D conversion
Piece (core progress is audio-visual synchronization coded treatment) is in conjunction with video.But this scheme has several big drawbacks: 1) monitoring device master
Control chip itself does not have audio defeat processing capacity, therefore (mainly audio contains to collected many and diverse audio signal
Environmental noise and useful audio --- such as voice) audio that cannot correctly carry out noise reduction process, therefore record often it is noisy not
Gently, it is difficult to differentiate useful audio.2) analog audio signal of microphone acquisition is highly prone to interfere during circuit transmission,
It is smudgy to will lead to collected sound.3) monitoring device main control chip itself does not have audio processing ability, therefore external
Microphone can only have is unable to satisfy the demand that monitoring device monitors on a large scale all the way.
To solve the above-mentioned problems, existing another scheme is to increase special audio processing mould on the basis of monitoring device
Block, for audio processing modules due to having an audio processing chip, one can carry out noise reduction process to the audio of acquisition, and two prop up
It holds multichannel microphone while acquisition also becomes possible.However analog audio signal is locked into existing scheme and is disturbed, therefore wheat
With regard to carrying out A/D conversion after gram elegance collection audio, then handled using Digital audio process module, it is ensured that subsequent transmission process
It is digital audio and video signals to avoid interfering.But since in input monitoring equipment main control chip, main control chip needs again
Resampling is carried out to digital audio and video signals, multiple repairing weld can cause the substantially distortion of original audio information, eventually lead to wherein weak
The loss of signal.Therefore the clarity that audio signal is acquired under such scheme is also very limited, and what is directly embodied is exactly that can not adopt
Collect longer-distance audio.
Summary of the invention
Having for demand is clearly acquired the technical problems to be solved by the present invention are: providing one kind and can meet remote audio
The safety monitoring circuit and its circuit design method of audio collection.
In order to solve the above-mentioned technical problem, a kind of the technical solution adopted by the present invention are as follows: security protection prison for having audio collection
Control circuit, including audio collecting system, safety defense monitoring system and power-supply system；
The audio collecting system is mainly formed by audio collection module, analogue audio frequency processing module and by source crystal oscillator；Institute
Stating safety defense monitoring system includes A/D sampling module and audio-visual synchronization coded treatment module；The power supply of the audio collecting system
Module includes analog power, simulation ground, digital power, digitally；
The audio collection module of the audio collecting system connects analogue audio frequency processing module, and analogue audio frequency processing module connects
The A/D sampling module of safety defense monitoring system is connect, A/D sampling module connects audio-visual synchronization coded treatment module；The simulation electricity
Source connect audio collection module and analogue audio frequency processing module with simulation；The digital power with digitally with audio collection system
The analogue audio frequency processing module of system has source crystal oscillator and the audio-visual synchronization coded treatment module of safety defense monitoring system to be connected.
Among the above, the power-supply system includes sequentially connected power interface, decompression chip and out-put supply module；
The out-put supply module includes digital power branch and analog power branch；
The digital power branch includes the first isolated location, the first filter unit and digital power number being sequentially connected
Word；
The analog power branch includes the second isolated location, the second filter unit and analog power mould being sequentially connected
Quasi- ground；
First isolated location is connected with the second isolated location with decompression chip.
Among the above, the power interface can access the first direct current/first alternating current；In power interface and decompression chip it
Between be also connected with rectification module；The decompression chip can access the second direct current；The decompression chip passes through out-put supply module
Export direct current.
The first anti-down flow module is equipped between the rectification module and decompression chip；It is anti-that the decompression chip is connected with second
Module is flow backwards, the 5V direct current passes through the second anti-down flow module access decompression chip.
Among the above, lightning protection Anti-surging module, High frequency filter module, transient electrical are additionally provided between power interface and rectification module
Press suppression module and insurance module.
Among the above, including multi-layer PCB board, it is arranged at intervals in the left and right of wherein layer of surface of multi-layer PCB board in block
Digitally and in block simulation；The audio collection module connects analogue audio frequency processing module, the mould by the first conducting wire
Quasi- audio processing modules connect A/D sampling module by the second conducting wire；First wrapped in wire is in blocking simulation ground；Institute
State the second wrapped in wire in it is blocking digitally in.
Among the above, including multi-layer PCB board, it is arranged at intervals in wherein another the left and right of layer surface of multi-layer PCB board in block
Digital power and analog power in block；Chamfering is equipped at the edge-corner of the digital power and analog power.
Among the above, the audio collection module includes the microphone of at least angled setting of two-way.
Among the above, the audio collection module connects including the first microphone interface, second microphone interface, third microphone
Mouth and the 4th microphone interface；The analogue audio frequency processing module all the way and connects the first microphone interface and connects with second microphone
Mouthful, another way simultaneously connects third microphone interface and the 4th microphone interface；The analogue audio frequency processing module output has biased electrical
Source, the bias supply connection second microphone interface and third microphone interface.
The invention further relates to a kind of safety monitoring circuit design methods for having audio collection, including,
By power-supply system be independently divided into for electricity output analog power, simulation ground, digital power, digitally the step of；
Using analogue audio frequency processing module, and the step of being collocated with source crystal oscillator for it；
Sound is inputted in digital form after analogue audio frequency processing module to be exported to the A/D sampling module sampling of access monitoring system
The step of audio video synchronization coded treatment module；
The step of by audio collection module and analogue audio frequency processing module access analog power, simulation ground；
By audio processing modules, there are source crystal oscillator and audio-visual synchronization coded treatment module access digital power, digitally
Step.
Among the above, further include,
The step of using multi-layer PCB board；
One layer of pcb board surface left and right blocking the step of being arranged digitally and simulating ground wherein；
The step of packet ground with simulation is carried out to the signal wire of audio collection module to analogue audio frequency processing module；
The step on packet ground with simulation and is digitally carried out to the signal wire of analogue audio frequency processing module to A/D sampling module
Suddenly.
The beneficial effects of the present invention are: fully consider that the practical application characteristic of security device, audio are adopted in design
Collecting system can realize power supply synchronization, and acquisition, the biography of all audio signals before safety defense monitoring system with safety monitoring equipment
Defeated, processing completes original analog, to guarantee the integrality of data to greatest extent, furthermore handles mould in analogue audio frequency
Block effectively avoids clock signal from interfering other signals or other signal interferences to clock signal, realizes using there is source crystal oscillator
The really acquisition and processing of remote high definition voice messaging in safety monitoring equipment, voice signal after handling still with
Within the transmitting voice signal of simulation to safety monitoring equipment, side is to initial analog voice signal in security device at this time
Sampling and digital-to-analogue conversion for the first time realize synchronous coding, transmission and output with HD video, efficiently solve safety monitoring equipment only
There is HD video to export and can not effectively realize the problem of monitored picture scene high definition voice.In addition, power-supply system is subdivided into
Mutually independent number, simulation duplex feeding, effectively reduce power supply to transmitted in circuit analog signal, digital signal it is dry
Disturb noise problem.
Detailed description of the invention
Specific structure of the invention is described in detail with reference to the accompanying drawing
Fig. 1 is schematic block circuit diagram of the invention；
Fig. 2 is specific embodiments of the present invention functional block diagram；
Fig. 3 is a wherein schematic diagram of a layer structure of PCB of the invention；
Fig. 4 is an other schematic diagram of a layer structure of PCB of the invention；
Fig. 5 is specific embodiments of the present invention circuit diagram 1；
Fig. 6 is specific embodiments of the present invention circuit diagram 2.
10- is digitally；20- simulation ground；The first conducting wire of 30-；40-- digital power；50- analog power.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
Referring to Fig. 1, a kind of safety monitoring circuit for having audio collection, including audio collecting system, safety monitoring system
System and power-supply system；
The audio collecting system is mainly formed by audio collection module, analogue audio frequency processing module and by source crystal oscillator；Institute
Stating safety defense monitoring system includes A/D sampling module and audio-visual synchronization coded treatment module；The power supply of the audio collecting system
Module includes analog power, simulation ground, digital power, digitally；
The audio collection module of the audio collecting system connects analogue audio frequency processing module, and analogue audio frequency processing module connects
The A/D sampling module of safety defense monitoring system is connect, A/D sampling module connects audio-visual synchronization coded treatment module；The simulation electricity
Source connect audio collection module and analogue audio frequency processing module with simulation；The digital power with digitally with audio collection system
The analogue audio frequency processing module of system has source crystal oscillator and the audio-visual synchronization coded treatment module of safety defense monitoring system to be connected.
As can be seen from the above description, the beneficial effects of the present invention are: fully consider that the reality of security device is answered when design
With characteristic, audio collecting system can realize power supply synchronization, and all audios before safety defense monitoring system with safety monitoring equipment
Acquisition, transmission, the processing of signal complete original analog, to guarantee the integrality of data to greatest extent, furthermore exist
Analogue audio frequency processing module effectively avoids clock signal from interfering other signals or other signal interferences then using there is source crystal oscillator
Clock signal realizes the really acquisition and processing of remote high definition voice messaging in safety monitoring equipment, after handling
Voice signal still with the transmitting voice signal of simulation to safety monitoring equipment within, to realize initial analog voice letter
Sampling for the first time and digital-to-analogue conversion number in security device realize synchronous coding, transmission and output with HD video.Effectively solve
Safety monitoring equipment only has HD video to export and can not effectively realize the problem of monitored picture scene high definition voice.In addition,
Power-supply system is subdivided into mutually independent number, simulation duplex feeding, effectively reduces simulation of the power supply to transmitting in circuit
The interference noise problem of signal, digital signal.
In addition, the power-supply system that the present invention configures, safety defense monitoring system scene power supply power supply in actual use can be met
Flexible use demand, i.e. audio collecting system can both take the mode that electricity is taken in monitoring device, and required power supply is set with monitoring
Standby interior mains voltage is consistent, can also be powered simultaneously with monitoring device using same power supply.It is not needed in a word as this system
A power supply is separately configured to power.
Shown in Figure 2 is specific embodiment schematic block circuit diagram.
Embodiment 1
Among the above, the power-supply system includes sequentially connected power interface, decompression chip and out-put supply module；
The out-put supply module includes digital power branch and analog power branch；
The digital power branch includes the first isolated location, the first filter unit and digital power number being sequentially connected
Word；
The analog power branch includes the second isolated location, the second filter unit and analog power mould being sequentially connected
Quasi- ground；
First isolated location is connected with the second isolated location with decompression chip.
Embodiment 2
Among the above, the power interface can access the first direct current/first alternating current；In power interface and decompression chip it
Between be also connected with rectification module；The decompression chip can access the second direct current；The decompression chip passes through out-put supply module
Export direct current.
The first anti-down flow module is equipped between the rectification module and decompression chip；It is anti-that the decompression chip is connected with second
Module is flow backwards, the 5V direct current passes through the second anti-down flow module access decompression chip.
One kind of environment electric power thus supplied design in the city one provided in the present embodiment according to safety monitoring equipment is general
Power-supply system, external unstable the first direct current (such as common 12V DC), the first exchange (such as common 24V exchange) power supply
A public power interface pass through rectification module after enter decompression chip, if at this point, using when access be 12V DC, can
Decompression chip is directly inputted by rectification module, 24V direct current can be become under rectification module effect if access is 24V exchange
Input decompression chip, and be directly connected to be depressured by another way if stable the second direct current (such as the 5V direct current of common USB standard)
Chip, from there through one wider decompression chip of supports input voltage range of selection (at least down toward support 5V i.e. in corresponding example,
Up to support 24V) it can be realized while being compatible with existing three kinds of input powers, voltage is down to peace by stable to be depressured chip
The common 3.3V of anti-monitoring device is for system use.
In addition, power-supply system is simultaneously in the present embodiment in order to guarantee the stabilization of this system own power source and control noise
It avoids introducing common mode and DM EMI, takes the mode being locally depressured, and noise reduction is filtered to the power supply after decompression and is set
Meter.
Embodiment 3
Among the above, lightning protection Anti-surging module, High frequency filter module, transient electrical are additionally provided between power interface and rectification module
Press suppression module and insurance module.
Since power interface access is external unstable power supply (refers mainly to power surge, ripple characteristics bad), because
For the sake of this safety, it is provided with multistage protection module after power interface input, wherein the absorbable input of lightning protection Anti-surging module
The instantaneous high pressure of power supply, high current, and High frequency filter module then can absorb the high frequency spurs of input power, transient voltage inhibits mould
Block then further prevents the mutation of instantaneous voltage, and insurance module then provides last protection together, prevents circuit from surprisingly being damaged.
Embodiment 4
The insurance module includes self-recovery fuse；The Anti-surging module includes that cascade varistor and gas are put
Fulgurite；The transient voltage suppression module includes TVS pipe；The rectification module includes full-bridge type rectification unit.
The present embodiment further uses self-recovery fuse as insurance module, so that product is after overload starting insurance,
Once external cause, which is eliminated, can be self-healing.Furthermore in the present embodiment, TVS (TRANSIENT VOLTAGE SUPPRESSOR) pipe,
Also referred to as transient voltage suppressor is a kind of new product to grow up on voltage-stabiliser tube Process ba- sis, is applied in circuit
When, when TVS pipe both ends are subjected to the high energy impact events of moment, it can make its resistance with high speed (up to 1*10-12 seconds)
It is anti-to reduce suddenly, while absorbing a high current, by the voltage clamp between its both ends one it is scheduled numerically, so that it is guaranteed that
Subsequent circuit element from transient state high-energy impact and damage.The reaction speed ratio RC fast 10E-12s in circuit of TVS, and can
Without the breakdown voltage VBR, reversed critical voltage VWM, peak-peak pulse current IPP and maximum clamping voltag VC that consider TVS
And peak pulse power PP.
Embodiment 5
Energy storage inductor is additionally provided between the decompression chip and out-put supply module；The energy storage inductor output connects all the way
Out-put supply module, another way feedback link is to being depressured chip.The present embodiment energy storage inductor can ensure that the stability of output electric current,
Furthermore an output feedback loop is constituted, the closed loop detection of output voltage is constituted, to can ensure that decompression chip output voltage
Stability.
Embodiment 6
As shown in figure 3, among the above, including multi-layer PCB board, it is set in the left and right interval of the wherein layer of surface of multi-layer PCB board
Be equipped in block digitally 10 and in block simulation 20；The audio collection module connects analogue audio frequency by the first conducting wire 30
Processing module, the analogue audio frequency processing module connect A/D sampling module by the second conducting wire；First conducting wire 30 is wrapped in
Blocking simulation in 20；With being wrapped in blocking simulation in 20, end extends wraps up to blocking second guidewire body
Digitally in 10.
The distinctive designs such as the anti-interference division of ground level；(4) analog voice signal is laid special stress on protecting in the design.It carries out
The anti-interference and anti-tampering design of effective PCB
Embodiment 7
As shown in figure 4, among the above, including multi-layer PCB board, in the left and right interval of wherein another layer surface of multi-layer PCB board
It is provided in the digital power 40 of block and the analog power 50 in block；The edge-corner of the digital power 40 and analog power 50
Place is equipped with chamfering.In the present embodiment, use the left and right distributed balance division mode of power supply flood pcb board, digital power 40 with
Chamfering is paid attention at the edge-corner of analog power 50, eliminates sharp comer, is generated to reduce interference.
By embodiment 6,7 as it can be seen that having carried out reasonable number to bus plane and stratum in entire circuit design, simulation is drawn
Point, avoid interfering with each other between different electrical power.Guarantee in the same circuit, digital power and analog power are independent of each other.
Embodiment 8
Among the above, the audio collection module includes the microphone of at least angled setting of two-way.
In the present embodiment, the technology of voice signal is captured using dual microphone, can further enhance the capture of voice signal
Ability.In addition, the voice signal equilibrium that all angles may be implemented is captured and is adopted by optimizing the angle between multiple microphones
Collection, to successfully capture and deal with the voice messaging of all angles in monitoring visual field.Realize safety monitoring Supervision
It controls the voice signal in the visual field without dead angle to capture, reaches the voice messaging safety monitoring purpose complementary with to monitor video.
Embodiment 9
Among the above, the audio collection module connects including the first microphone interface, second microphone interface, third microphone
Mouth and the 4th microphone interface；The analogue audio frequency processing module all the way and connects the first microphone interface and connects with second microphone
Mouthful, another way simultaneously connects third microphone interface and the 4th microphone interface；The analogue audio frequency processing module output has biased electrical
Source, the bias supply connection second microphone interface and third microphone interface.Audio collection module output as a result, has two-way
Microphone interface, every road microphone interface support selection to access passive microphone or active microphone respectively.So that circuit is general
It supports different microphones, increases the versatility of circuit more.
Herein first, second ... only represents the differentiation of its title, not representing their significance level and position has what
It is different.
The specific embodiment circuit diagram that the present invention has the safety monitoring circuit of audio collection is as shown in Figure 5,6.Wherein Fig. 5
For power system portion specific embodiment circuit diagram.Fig. 6 is audio collecting system some embodiments circuit diagram.
The invention further relates to a kind of safety monitoring circuit design methods for having audio collection, including,
By power-supply system be independently divided into for electricity output analog power, simulation ground, digital power, digitally the step of；
Using analogue audio frequency processing module, and the step of being collocated with source crystal oscillator for it；
Sound is inputted in digital form after analogue audio frequency processing module to be exported to the A/D sampling module sampling of access monitoring system
The step of audio video synchronization coded treatment module；
The step of by audio collection module and analogue audio frequency processing module access analog power, simulation ground；
By audio processing modules, there are source crystal oscillator and audio-visual synchronization coded treatment module access digital power, digitally
Step.
As can be seen from the above description, the beneficial effects of the present invention are: all audios in design before safety defense monitoring system
Acquisition, transmission, the processing of signal complete original analog, to guarantee the integrality of data to greatest extent, furthermore exist
Analogue audio frequency processing module effectively avoids clock signal from interfering other signals or other signal interferences then using there is source crystal oscillator
Clock signal realizes the really acquisition and processing of remote high definition voice messaging in safety monitoring equipment, after handling
Voice signal still with the transmitting voice signal of simulation to safety monitoring equipment within, to realize initial analog voice letter
Sampling for the first time and digital-to-analogue conversion number in security device realize synchronous coding, transmission and output with HD video.Effectively solve
Safety monitoring equipment only has HD video to export and can not effectively realize the problem of monitored picture scene high definition voice.In addition,
Power-supply system is subdivided into mutually independent number, simulation duplex feeding, effectively reduces simulation of the power supply to transmitting in circuit
The interference noise problem of signal, digital signal.
Embodiment 1
In the above method, further include,
The step of using multi-layer PCB board；
One layer of pcb board surface left and right blocking the step of being arranged digitally and simulating ground wherein；
The step of packet ground with simulation is carried out to the signal wire of audio collection module to analogue audio frequency processing module；
The step on packet ground with simulation and is digitally carried out to the signal wire of analogue audio frequency processing module to A/D sampling module
Suddenly.
Embodiment 2
In the above method, further include,
The step of using multi-layer PCB board；
In the left and right step for being arranged at intervals with the digital power in block and the analog power in block in wherein one layer of pcb board surface
Suddenly；
The step of eliminating the wedge angle of the edge-corner of digital power and analog power.
Embodiment 3
Setting uses the step of two-way microphone is as audio collection module；
The step of setting that two-way microphone is angled.
The citing of the technology of the present invention application scenarios:
Certain bank's project demand carries out high-definition monitoring to Counter service, and requires comprehensive reduction field condition, removes video
Outside, the voice messaging at monitoring device real-time capture scene is also needed.But due to the angle problem of high-definition monitoring equipment installation, video camera
Apart from sales counter, speaker is apart from each other, can not accurately collect the sound of speaker.The enhanced voice collecting mould of customer requirement
The design is applied on web camera in this context, has by block, the people's voice that can at least capture within the scope of sales counter
Effect solves the farther away voice signal in scene and captures acquisition, realizes the comprehensive voice monitoring at scene.
In conclusion obtaining technical solution of the present invention after tested has following advantage:
1, the lock-on range for effectively increasing voice signal is different from the prior art and is typically only capable to complete audio collection in 3 meters
And voice is mingled in situation about not knowing in ambient noise, actual measurement, can environment can be effective indoors using after the present invention program
Capture the voice voice messaging of normally speaking within the scope of 15 meters；8 meters of models can be effectively captured in outdoor non-noisy occasion
Enclose interior normal talker's sound.
2, scheme can flexible Application into existing safety monitoring equipment, as high-definition network camera/hemisphere/quick/holder/
The safety monitorings equipment such as NVR.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of safety monitoring circuit for having audio collection, it is characterised in that: including audio collecting system, safety defense monitoring system
And power-supply system；
The audio collecting system is mainly formed by audio collection module, analogue audio frequency processing module and by source crystal oscillator；The peace
Anti- monitoring system includes A/D sampling module and audio-visual synchronization coded treatment module；The power module of the audio collecting system
Including analog power, simulation ground, digital power, digitally；
The audio collection module of the audio collecting system connects analogue audio frequency processing module, analogue audio frequency processing module connection peace
The A/D sampling module of anti-monitoring system, A/D sampling module connect audio-visual synchronization coded treatment module；The analog power with
Simulation ground connection audio collection module and analogue audio frequency processing module；The digital power with digitally with audio collecting system
Analogue audio frequency processing module has source crystal oscillator and the audio-visual synchronization coded treatment module of safety defense monitoring system to be connected.
2. having the safety monitoring circuit of audio collection as described in claim 1, it is characterised in that: the power-supply system includes
Sequentially connected power interface, decompression chip and out-put supply module；
The out-put supply module includes digital power branch and analog power branch；
The digital power branch includes the first isolated location, the first filter unit and the digital power number being sequentially connected
Ground；
The analog power branch includes the second isolated location, the second filter unit and the analog power simulation being sequentially connected
Ground；
First isolated location is connected with the second isolated location with decompression chip.
3. having the safety monitoring circuit of audio collection as claimed in claim 2, it is characterised in that: the power interface can connect
Enter the first direct current/first alternating current；Rectification module is also connected between power interface and decompression chip；The decompression chip
It can access the second direct current；The decompression chip exports direct current by out-put supply module；
The first anti-down flow module is equipped between the rectification module and decompression chip；The decompression chip is connected with the second anti-backflow
Module, second direct current pass through the second anti-down flow module access decompression chip.
4. having the safety monitoring circuit of audio collection as claimed in claim 2, it is characterised in that: in power interface and rectification
Intermodule is additionally provided with lightning protection Anti-surging module, High frequency filter module, transient voltage suppression module and insurance module.
5. the safety monitoring circuit for having audio collection as described in claim 1-4 any one, it is characterised in that: including more
Layer pcb board, in multi-layer PCB board wherein layer of surface it is left and right be arranged at intervals in block digitally and in block simulation；
The audio collection module connects analogue audio frequency processing module by the first conducting wire, and the analogue audio frequency processing module passes through second
Conducting wire connects A/D sampling module；First wrapped in wire is in blocking simulation ground；Second wrapped in wire is in blocking
In digitally.
6. the safety monitoring circuit for having audio collection as described in claim 1-4 any one, it is characterised in that: including more
Layer pcb board, is arranged at intervals with the digital power in block and the simulation in block in the left and right of wherein layer of surface of multi-layer PCB board
Power supply；Chamfering is equipped at the edge-corner of the digital power and analog power.
7. the safety monitoring circuit for having audio collection as described in claim 1-4 any one, it is characterised in that: the sound
Frequency acquisition module includes the microphone of at least angled setting of two-way.
8. having the safety monitoring circuit of audio collection as claimed in claim 7, it is characterised in that: the audio collection module
Including the first microphone interface, second microphone interface, third microphone interface and the 4th microphone interface；The analogue audio frequency
Processing module all the way and connects the first microphone interface and second microphone interface, and another way simultaneously meets third microphone interface and the 4th
Microphone interface；The analogue audio frequency processing module output has bias supply, and the bias supply connects second microphone interface
With third microphone interface.
9. a kind of safety monitoring circuit design method for having audio collection, it is characterised in that: including,
By power-supply system be independently divided into for electricity output analog power, simulation ground, digital power, digitally the step of；
Using analogue audio frequency processing module, and the step of being collocated with source crystal oscillator for it；
Audio-video is inputted in digital form after analogue audio frequency processing module to be exported to the A/D sampling module sampling of access monitoring system
The step of synchronous coding processing module；
The step of by audio collection module and analogue audio frequency processing module access analog power, simulation ground；
By audio processing modules, have source crystal oscillator and audio-visual synchronization coded treatment module access digital power, digitally the step of.
10. having the safety monitoring circuit design method of audio collection as claimed in claim 9, it is characterised in that: further include,
The step of using multi-layer PCB board；
One layer of pcb board surface left and right blocking the step of being arranged digitally and simulating ground wherein；
The step of packet ground with simulation is carried out to the signal wire of audio collection module to analogue audio frequency processing module；
The step of carrying out packet ground with simulation ground and digitally to the signal wire of analogue audio frequency processing module to A/D sampling module.
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| CN105245856A (en) | 2016-01-13 |
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