CN105245856A - Security monitoring circuit with audio collection, and circuit design method thereof - Google Patents
Security monitoring circuit with audio collection, and circuit design method thereof Download PDFInfo
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Abstract
The invention provides a security monitoring circuit with audio collection, and a circuit design method thereof. The collection, transmission and processing of the audio signals are all finished in the form of the original analog signals before the audio signals are inputted into a security monitoring system, so as to ensure the data integrity to the utmost extent. In addition, an active crystal oscillator is used in an analog audio processing module so as to effectively avoid the mutual interference between the clock signals and the other signals, the voice signals after processing are transmitted to a security monitoring device still in the form of the analog voice signals, and from here, the original analog voice signals are subjected to sampling and analog-to-digital conversion for the first time in the security monitoring device, and the obtained digital voice signals are encoded, transmitted and output synchronously with the high-definition video, so that a difficult problem that the security monitoring device only can output the high-definition video, but cannot effectively achieve the output of the in-site high-definition voice of a monitoring picture is effectively solved. Furthermore, a power supply circuit of a power system is subdivided into two independent digital and analog circuits, so that the interference noise of a power supply to the analog and digital signals which are transmitted in the circuit can be effectively reduced.
Description
Technical field
The present invention relates to a kind of audio sample circuit, refer in particular to a kind of the safety monitoring circuit and the circuit design method thereof that possess audio collection.
Background technology
The reduction to monitoring site video pictures is mainly absorbed in by traditional watch-dog, to such an extent as to some watch-dog catching and capacity gauge without field speech signal.But along with the popularization of monitoring application, the importance of audio collection also highlights gradually.But in existing protection and monitor field, even if the equipment possessing voice monitoring also can only meet in-plant voice collecting and seizure, distance sound slightly far away often or completely catches less than voice messaging, the voice messaging captured is smudgy, can not effectively carry out differentiating and audiovisual, thus cause not can completely to reduce monitored scene.
Trace it to its cause is caused for the design of audio collection is unreasonable by watch-dog.Such as, the audio collection of existing watch-dog adopts two schemes:
One is that direct peripheral hardware arranges microphone, and microphone enters watch-dog main control chip (core carry out be audio-visual synchronization coded treatment) after being directly sent to A/D conversion and is combined with video.But this scheme has several large drawback: 1) watch-dog main control chip itself does not possess audio defeat disposal ability, therefore to the numerous and diverse audio signal collected (mainly audio pack contains environmental noise and useful audio frequency---as voice) can not be correct carry out noise reduction process, therefore the audio frequency recorded is often noisy not light, is difficult to differentiate useful audio frequency.2) simulated audio signal of microphone collection is very easily interfered in circuit transmission process, and the sound that collects also can be caused smudgy.3) watch-dog main control chip itself does not possess audio frequency disposal ability, and therefore External microphone can only have a road, cannot meet the demand that watch-dog is monitored on a large scale.
In order to solve the problem, existing another kind of scheme increases special audio processing modules on watch-dog basis, audio processing modules is owing to possessing audio processing chip, and therefore one can carry out noise reduction process to the audio frequency gathered, and two support that multichannel microphone gathers simultaneously also becomes possibility.But lock into simulated audio signal in existing scheme and be disturbed, therefore microphone just carries out A/D conversion after gathering audio frequency, then adopts Digital audio process module to process, guarantees that subsequent transmission process is digital audio and video signals thus avoids interference.But due to when input monitoring equipment main control chip, main control chip needs to carry out resampling to digital audio and video signals again, and multiple repairing weld can cause the significantly distortion of original audio information, finally causes the loss of wherein weak signal.Therefore the definition gathering audio signal under this kind of scheme is also very limited, and that directly embodies cannot gather longer-distance audio frequency exactly.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of the safety monitoring circuit possessing audio collection and the circuit design method thereof that meet the clear collection demand of remote audio frequency.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of safety monitoring circuit possessing audio collection, comprises audio collecting system, safety defense monitoring system and power-supply system;
Described audio collecting system forms primarily of audio collection module, analogue audio frequency processing module and active crystal oscillator; Described safety defense monitoring system comprises A/D sampling module and audio-visual synchronization coded treatment module; The power module of described audio collecting system comprise analog power, in analog, digital power, digitally;
The audio collection module connecting analog audio processing modules of described audio collecting system, analogue audio frequency processing module connects the A/D sampling module of safety defense monitoring system, and A/D sampling module connects audio-visual synchronization coded treatment module; Described analog power be connected audio collection module and analogue audio frequency processing module in analog; Described digital power be digitally connected with the audio-visual synchronization coded treatment module of the analogue audio frequency processing module of audio collecting system, active crystal oscillator and safety defense monitoring system.
In above-mentioned, described power-supply system comprises the power interface, step-down chip and the out-put supply module that connect successively;
Described out-put supply module comprises digital power branch road and analog power branch road;
Described digital power branch road comprises connected successively the first isolated location, the first filter unit and digital power digitally;
Described analog power branch road comprises connected successively the second isolated location, the second filter unit and analog power in analog;
Described first isolated location is connected with step-down chip with the second isolated location.
In above-mentioned, described power interface can be accessed by the first direct current/the first alternating current; Also rectification module is connected with between power interface and step-down chip; Described step-down chip can be accessed by the second direct current; Described step-down chip exports direct current by out-put supply module.
The first anti-backflow module is provided with between described rectification module and step-down chip; Described step-down chip is connected with the second anti-backflow module, and described 5V direct current is by the second anti-backflow module access step-down chip.
In above-mentioned, between power interface and rectification module, be also provided with lightning-protection surge module, High frequency filter module, transient voltage suppression module and insurance module.
In above-mentioned, comprise multi-layer PCB board, in wherein layer of surface left and right of multi-layer PCB board be arranged at intervals with in block digitally and in block in analog; Described audio collection module is by the first wire connecting analog audio processing modules, and described analogue audio frequency processing module connects A/D sampling module by the second wire; Described first wrapped in wire in become block in analog in; Described second wrapped in wire in become block digitally in.
In above-mentioned, comprise multi-layer PCB board, the left and right of wherein another layer of surface in multi-layer PCB board is arranged at intervals with the digital power in block and the analog power in block; The edge-corner place of described digital power and analog power is provided with chamfering.
In above-mentioned, described audio collection module comprises the microphone that at least two-way is angularly arranged.
In above-mentioned, described audio collection module comprises the first microphone interface, second microphone interface, the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module one tunnel also connects the first microphone interface and second microphone interface, and another road also connects the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module exports bias supply, and described bias supply connects second microphone interface and the 3rd microphone interface.
The invention still further relates to a kind of safety monitoring circuit design method possessing audio collection, comprise,
The power supply of power-supply system is exported independently be divided into analog power, in analog, digital power, step digitally;
Adopt analogue audio frequency processing module, and be its step of active crystal oscillator of arranging in pairs or groups;
The step of audio-visual synchronization coded treatment module is inputted in digital form after analogue audio frequency processing module being exported the A/D sampling module sampling of access supervisory control system;
By audio collection module and analogue audio frequency processing module access analog power, step in analog;
By audio processing modules, active crystal oscillator and audio-visual synchronization coded treatment module access digital power, step digitally.
In above-mentioned, also comprise,
Adopt the step of multi-layer PCB board;
The left and right one-tenth block in one deck pcb board surface arranges step digitally and in analog wherein;
With carrying out the step of wrapping ground to audio collection module to the holding wire of analogue audio frequency processing module in analog;
With in analog and digitally carrying out the step of wrapping ground to analogue audio frequency processing module to the holding wire of A/D sampling module.
Beneficial effect of the present invention is: the practical application characteristic having taken into full account security device in design, audio collecting system can realize power supply synchronization with safety monitoring equipment, and the collection of all audio signals before safety defense monitoring system, transmission, process all completes original analog, thus ensure the integrality of data to greatest extent, this external analogue audio frequency processing module adopts active crystal oscillator, clock signal is effectively avoided to disturb other signals or other signal disturbing to clock signal, achieve the acquisition and processing of remote high definition voice messaging real on safety monitoring equipment, voice signal after process is still with within the transmitting voice signal of simulation to safety monitoring equipment, now side is to the first sampling of initial analog voice signal in security device and digital-to-analogue conversion, synchronous coding is realized with HD video, transmission and output, efficiently solving safety monitoring equipment only has HD video export and effectively cannot realize a difficult problem for the on-the-spot high definition voice of monitored picture.In addition, power-supply system is subdivided into separate numeral, simulation duplex feeding, effectively reduces the interference noise problem of power supply to the analog signal transmitted in circuit, digital signal.
Accompanying drawing explanation
Below in conjunction with accompanying drawing in detail concrete structure of the present invention is described in detail
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is specific embodiments of the invention theory diagram;
Fig. 3 is wherein one deck structural representation of PCB of the present invention;
Fig. 4 is other one deck structural representation of PCB of the present invention;
Fig. 5 is specific embodiments of the invention circuit diagram 1;
Fig. 6 is specific embodiments of the invention circuit diagram 2.
10-digitally; 20-in analog; 30-first wire; 40--digital power; 50-analog power.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
Refer to Fig. 1, a kind of safety monitoring circuit possessing audio collection, comprises audio collecting system, safety defense monitoring system and power-supply system;
Described audio collecting system forms primarily of audio collection module, analogue audio frequency processing module and active crystal oscillator; Described safety defense monitoring system comprises A/D sampling module and audio-visual synchronization coded treatment module; The power module of described audio collecting system comprise analog power, in analog, digital power, digitally;
The audio collection module connecting analog audio processing modules of described audio collecting system, analogue audio frequency processing module connects the A/D sampling module of safety defense monitoring system, and A/D sampling module connects audio-visual synchronization coded treatment module; Described analog power be connected audio collection module and analogue audio frequency processing module in analog; Described digital power be digitally connected with the audio-visual synchronization coded treatment module of the analogue audio frequency processing module of audio collecting system, active crystal oscillator and safety defense monitoring system.
From foregoing description, beneficial effect of the present invention is: the practical application characteristic having taken into full account security device during design, audio collecting system can realize power supply synchronization with safety monitoring equipment, and the collection of all audio signals before safety defense monitoring system, transmission, process all completes original analog, thus ensure the integrality of data to greatest extent, this external analogue audio frequency processing module adopts active crystal oscillator, clock signal is effectively avoided to disturb other signals or other signal disturbing to clock signal, achieve the acquisition and processing of remote high definition voice messaging real on safety monitoring equipment, voice signal after process is still with within the transmitting voice signal of simulation to safety monitoring equipment, thus achieve the first sampling of initial analog voice signal in security device and digital-to-analogue conversion, synchronous coding is realized with HD video, transmission and output.Efficiently solving safety monitoring equipment only has HD video export and effectively cannot realize a difficult problem for the on-the-spot high definition voice of monitored picture.In addition, power-supply system is subdivided into separate numeral, simulation duplex feeding, effectively reduces the interference noise problem of power supply to the analog signal transmitted in circuit, digital signal.
In addition, the power-supply system of the present invention's configuration, the flexible user demand of Power supply when the on-the-spot reality of safety defense monitoring system uses can be met, namely audio collecting system both can take the mode of power taking in watch-dog, required power supply is consistent with the mains voltage in watch-dog, also same power supply can be used to power with watch-dog simultaneously.Do not need in a word to power for native system configures separately a power supply.
Shown in Figure 2 is specific embodiment schematic block circuit diagram.
Embodiment 1
In above-mentioned, described power-supply system comprises the power interface, step-down chip and the out-put supply module that connect successively;
Described out-put supply module comprises digital power branch road and analog power branch road;
Described digital power branch road comprises connected successively the first isolated location, the first filter unit and digital power digitally;
Described analog power branch road comprises connected successively the second isolated location, the second filter unit and analog power in analog;
Described first isolated location is connected with step-down chip with the second isolated location.
Embodiment 2
In above-mentioned, described power interface can be accessed by the first direct current/the first alternating current; Also rectification module is connected with between power interface and step-down chip; Described step-down chip can be accessed by the second direct current; Described step-down chip exports direct current by out-put supply module.
The first anti-backflow module is provided with between described rectification module and step-down chip; Described step-down chip is connected with the second anti-backflow module, and described 5V direct current is by the second anti-backflow module access step-down chip.
According to a kind of general power-supply system of the environment electric power thus supplied design of safety monitoring equipment in the city one provided in the present embodiment, outside unstable the first direct current (the 12V direct current as common), first exchanges the public power interface of (as common 24V exchanges) power supply by entering step-down chip after rectification module, now, if access is 12V direct current during use, then can directly by rectification module input step-down chip, if access is 24V interchange, 24V direct current input step-down chip can be become under rectification module effect, stable the second direct current (the 5V direct current as common USB standard) then directly receives step-down chip by another road, thus by selection one support the wider step-down chip of input voltage range (namely in corresponding example at least down to supporting 5V, on to supporting 24V) simultaneously compatible existing three kinds of input powers can be realized, thus the stable 3.3V that voltage is down to safety monitoring equipment common uses for system by step-down chip.
In addition, in the present embodiment, power-supply system is in order to ensure the stable of native system own power source and control noises, simultaneously in order to avoid introducing common mode and differential mode interference, taking the pattern of local step-down, and carrying out filtering noise-reducing design to the power supply after step-down.
Embodiment 3
In above-mentioned, between power interface and rectification module, be also provided with lightning-protection surge module, High frequency filter module, transient voltage suppression module and insurance module.
Due to power interface access is outside unstable power supply (mainly refer to power surge, ripple characteristics bad), therefore for the purpose of safety, multistage protection module is provided with after power interface input, the wherein instantaneous high pressure of lightning-protection surge module Absorbable rod input power, big current, the high frequency spurs of High frequency filter module then Absorbable rod input power, transient voltage suppression module then prevents the sudden change of instantaneous voltage further, insurance module then provides last protection together, prevents circuit from surprisingly being damaged.
Embodiment 4
Described insurance module comprises resettable fuse; Described Anti-surging module comprises piezo-resistance and the gas discharge tube of cascade; Described transient voltage suppression module comprises TVS pipe; Described rectification module comprises full-bridge type rectification unit.
The present embodiment adopts resettable fuse as insurance module further, makes product after overload starts insurance, can recover voluntarily once external cause is eliminated.In addition in the present embodiment, TVS (TRANSIENTVOLTAGESUPPRESSOR) manages, also transient voltage suppressor is claimed to be a kind of new product grown up on voltage-stabiliser tube Process ba-sis, when it is applied in circuit, when the high energy impact events of moment is stood at TVS pipe two ends, it can make its impedance suddenly reduce with high speed (be up to 1*10-12 second), simultaneously stability big current, voltage clamp between its two ends is numerically predetermined at one, thus guarantee that circuit element below damages from the high-octane impact of transient state.The reaction speed 10E-12s faster than RC loop of TVS, and the puncture voltage VBR of TVS can be considered, reverse critical voltage VWM, peak-peak pulse current IPP and maximum clamping voltage VC and peak pulse power PP.
Embodiment 5
Also energy storage inductor is provided with between described step-down chip and out-put supply module; Described energy storage inductor exports a road and connects out-put supply module, and another road feedback link is to step-down chip.The present embodiment energy storage inductor can guarantee the stability of output current, forms an output feedack loop in addition, forms the closed loop detect of output voltage, thus can guarantee the stability of step-down chip output voltage.
Embodiment 6
As shown in Figure 3, in above-mentioned, comprise multi-layer PCB board, in wherein layer of surface left and right of multi-layer PCB board be arranged at intervals with in block digitally 10 and in block in analog 20; Described audio collection module is by the first wire 30 connecting analog audio processing modules, and described analogue audio frequency processing module connects A/D sampling module by the second wire; Described first wire 30 is wrapped in in analog in 20 of block; Described second guidewire body is wrapped in in analog in 20 of block, and its end extends parcel to becoming digitally in 10 of block.
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.Carry out the anti-interference and anti-tampering design of effective PCB
Embodiment 7
As shown in Figure 4, in above-mentioned, comprise multi-layer PCB board, the left and right of wherein another layer of surface in multi-layer PCB board is arranged at intervals with the digital power 40 in block and the analog power 50 in block; Described digital power 40 is provided with chamfering with the edge-corner place of analog power 50.In the present embodiment, have employed the left and right distributed balance dividing mode of power supply flood pcb board, digital power 40 all notes chamfering with the edge-corner place of analog power 50, eliminates sharp comer, thus reduces interference generation.
By embodiment 6,7 visible, whole circuit design carries out rational numeral to bus plane and stratum, simulation has divided, avoided the mutual interference between different electrical power.Ensure that, in same circuit, digital power and analog power are independent of each other.
Embodiment 8
In above-mentioned, described audio collection module comprises the microphone that at least two-way is angularly arranged.
In the present embodiment, utilize dual microphone to catch the technology of voice signal, the capturing ability of voice signal can be strengthened further.In addition, by optimizing the angle between multiple microphone, the voice signal equilibrium that can realize all angles catches and gathers, thus is successfully caught by the voice messaging of all angles in monitoring visual field and deal with.The voice signal realized without dead angle in the safety monitoring monitoring of tools visual field catches, and reaches voice messaging and the safety monitoring object to the complementation of monitor video.
Embodiment 9
In above-mentioned, described audio collection module comprises the first microphone interface, second microphone interface, the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module one tunnel also connects the first microphone interface and second microphone interface, and another road also connects the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module exports bias supply, and described bias supply connects second microphone interface and the 3rd microphone interface.Thus, audio collection module exports two-way microphone interface, and every road microphone interface is supported to select the passive microphone of access or active microphone respectively.Make the different microphone of the general support of circuit, increase the versatility of circuit more.
Herein first, second ... only represent the differentiation of its title, there is any difference the significance level and the position that do not represent them.
The present invention possesses the specific embodiment circuit diagram of the safety monitoring circuit of audio collection as shown in Figure 5,6.Wherein Fig. 5 is power-supply system some embodiments circuit diagram.Fig. 6 is audio collecting system some embodiments circuit diagram.
The invention still further relates to a kind of safety monitoring circuit design method possessing audio collection, comprise,
The power supply of power-supply system is exported independently be divided into analog power, in analog, digital power, step digitally;
Adopt analogue audio frequency processing module, and be its step of active crystal oscillator of arranging in pairs or groups;
The step of audio-visual synchronization coded treatment module is inputted in digital form after analogue audio frequency processing module being exported the A/D sampling module sampling of access supervisory control system;
By audio collection module and analogue audio frequency processing module access analog power, step in analog;
By audio processing modules, active crystal oscillator and audio-visual synchronization coded treatment module access digital power, step digitally.
From foregoing description, beneficial effect of the present invention is: the collection of all audio signals in design before safety defense monitoring system, transmission, process all completes original analog, thus ensure the integrality of data to greatest extent, this external analogue audio frequency processing module adopts active crystal oscillator, clock signal is effectively avoided to disturb other signals or other signal disturbing to clock signal, achieve the acquisition and processing of remote high definition voice messaging real on safety monitoring equipment, voice signal after process is still with within the transmitting voice signal of simulation to safety monitoring equipment, thus achieve the first sampling of initial analog voice signal in security device and digital-to-analogue conversion, synchronous coding is realized with HD video, transmission and output.Efficiently solving safety monitoring equipment only has HD video export and effectively cannot realize a difficult problem for the on-the-spot high definition voice of monitored picture.In addition, power-supply system is subdivided into separate numeral, simulation duplex feeding, effectively reduces the interference noise problem of power supply to the analog signal transmitted in circuit, digital signal.
Embodiment 1
In said method, also comprise,
Adopt the step of multi-layer PCB board;
The left and right one-tenth block in one deck pcb board surface arranges step digitally and in analog wherein;
With carrying out the step of wrapping ground to audio collection module to the holding wire of analogue audio frequency processing module in analog;
With in analog and digitally carrying out the step of wrapping ground to analogue audio frequency processing module to the holding wire of A/D sampling module.
Embodiment 2
In said method, also comprise,
Adopt the step of multi-layer PCB board;
The left and right step being arranged at intervals with the digital power in block and the analog power in block in one deck pcb board surface wherein;
Eliminate the step of the wedge angle of the edge-corner of digital power and analog power.
Embodiment 3
The step adopting two-way microphone as audio collection module is set;
By the step that two-way microphone is angularly arranged.
The technology of the present invention application scenarios is illustrated:
Certain bank's project demand carries out high-definition monitoring to Counter service, and requires comprehensive reduction field condition, except video, also needs the voice messaging of the real-time capture site of watch-dog.But due to the angle problem that high-definition monitoring equipment is installed, video camera distance sales counter speaker is apart from each other, cannot accurate acquisition to the sound of speaker.The voice acquisition module of customer requirement enhancement mode, at least can capture the people's voice within the scope of sales counter, in this context, the design is applied on web camera, efficiently solve on-the-spot voice signal far away and catch collection, achieve on-the-spot comprehensive voice monitoring.
In sum, obtain technical solution of the present invention after tested and have following advantage:
1, the lock-on range of voice signal is effectively increased, be different from prior art and usually can only complete audio collection in 3 meters and voice is mingled in unclear situation in ambient noise, actual measurement effectively can capture the voice voice messaging of normally speaking within the scope of 15 meters after adopting the present invention program in indoor environment; In outdoor, non-noisy occasion effectively can capture normal talker's sound within the scope of 8 meters.
2, scheme can flexible Application in existing safety monitoring equipment, as safety monitoring equipment such as high-definition network camera/hemisphere/quick/The Cloud Terrace/NVR.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. possess a safety monitoring circuit for audio collection, it is characterized in that: comprise audio collecting system, safety defense monitoring system and power-supply system;
Described audio collecting system forms primarily of audio collection module, analogue audio frequency processing module and active crystal oscillator; Described safety defense monitoring system comprises A/D sampling module and audio-visual synchronization coded treatment module; The power module of described audio collecting system comprise analog power, in analog, digital power, digitally;
The audio collection module connecting analog audio processing modules of described audio collecting system, analogue audio frequency processing module connects the A/D sampling module of safety defense monitoring system, and A/D sampling module connects audio-visual synchronization coded treatment module; Described analog power be connected audio collection module and analogue audio frequency processing module in analog; Described digital power be digitally connected with the audio-visual synchronization coded treatment module of the analogue audio frequency processing module of audio collecting system, active crystal oscillator and safety defense monitoring system.
2. possess the safety monitoring circuit of audio collection as claimed in claim 1, it is characterized in that: described power-supply system comprises the power interface, step-down chip and the out-put supply module that connect successively;
Described out-put supply module comprises digital power branch road and analog power branch road;
Described digital power branch road comprises connected successively the first isolated location, the first filter unit and digital power digitally;
Described analog power branch road comprises connected successively the second isolated location, the second filter unit and analog power in analog;
Described first isolated location is connected with step-down chip with the second isolated location.
3. possess the safety monitoring circuit of audio collection as claimed in claim 2, it is characterized in that: described power interface can be accessed by the first direct current/the first alternating current; Also rectification module is connected with between power interface and step-down chip; Described step-down chip can be accessed by the second direct current; Described step-down chip exports direct current by out-put supply module.
The first anti-backflow module is provided with between described rectification module and step-down chip; Described step-down chip is connected with the second anti-backflow module, and described 5V direct current is by the second anti-backflow module access step-down chip.
4. possess the safety monitoring circuit of audio collection as claimed in claim 2, it is characterized in that: between power interface and rectification module, be also provided with lightning-protection surge module, High frequency filter module, transient voltage suppression module and insurance module.
5. the safety monitoring circuit possessing audio collection as described in claim 1-4 any one, is characterized in that: comprise multi-layer PCB board, in wherein layer of surface left and right of multi-layer PCB board be arranged at intervals with in block digitally and in block in analog; Described audio collection module is by the first wire connecting analog audio processing modules, and described analogue audio frequency processing module connects A/D sampling module by the second wire; Described first wrapped in wire in become block in analog in; Described second wrapped in wire in become block digitally in.
6. the safety monitoring circuit possessing audio collection as described in claim 1-4 any one, is characterized in that: comprise multi-layer PCB board, and the left and right of wherein another layer of surface in multi-layer PCB board is arranged at intervals with the digital power in block and the analog power in block; The edge-corner place of described digital power and analog power is provided with chamfering.
7. the safety monitoring circuit possessing audio collection as described in claim 1-4 any one, is characterized in that: described audio collection module comprises the microphone that at least two-way is angularly arranged.
8. possess the safety monitoring circuit of audio collection as claimed in claim 7, it is characterized in that: described audio collection module comprises the first microphone interface, second microphone interface, the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module one tunnel also connects the first microphone interface and second microphone interface, and another road also connects the 3rd microphone interface and the 4th microphone interface; Described analogue audio frequency processing module exports bias supply, and described bias supply connects second microphone interface and the 3rd microphone interface.
9. possess a safety monitoring circuit design method for audio collection, it is characterized in that: comprise,
The power supply of power-supply system is exported independently be divided into analog power, in analog, digital power, step digitally;
Adopt analogue audio frequency processing module, and be its step of active crystal oscillator of arranging in pairs or groups;
The step of audio-visual synchronization coded treatment module is inputted in digital form after analogue audio frequency processing module being exported the A/D sampling module sampling of access supervisory control system;
By audio collection module and analogue audio frequency processing module access analog power, step in analog;
By audio processing modules, active crystal oscillator and audio-visual synchronization coded treatment module access digital power, step digitally.
10. possess the safety monitoring circuit design method of audio collection as claimed in claim 9, it is characterized in that: also comprise,
Adopt the step of multi-layer PCB board;
The left and right one-tenth block in one deck pcb board surface arranges step digitally and in analog wherein;
With carrying out the step of wrapping ground to audio collection module to the holding wire of analogue audio frequency processing module in analog;
With in analog and digitally carrying out the step of wrapping ground to analogue audio frequency processing module to the holding wire of A/D sampling module.
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