CN208210277U - A kind of hearing monitoring system and array microphone - Google Patents

Abstract

The utility model discloses a kind of hearing monitoring system and array microphones.Wherein, array microphone includes the first microphone module, second microphone module, DSP noise reduction module and amplification module, the sound of perpetual object is picked up by first microphone module and second microphone module, and it exports to DSP noise reduction module, inhibit the interference of environmental noise by the DSP noise reduction module, the sound of perpetual object is obtained, and is exported after amplification module amplifies.The utility model picks up sound by using two microphone modules, clearly voice signal is exported after removal environmental noise is filtered by DSP noise reduction module, amplify to obtain the sound of perpetual object through amplification module again, keeps the sound of output apparent, and it is strong to do interference performance.

Description

A kind of hearing monitoring system and array microphone

Technical field

The utility model relates to data processing technique, in particular to a kind of hearing monitoring system and array microphone.

Background technique

The places such as hearing room generally comprise inquiry room and study and judge room, and suspect interrogates in inquiry room, staff Hearing situation in the room of studying and judging observation inquiry room.Monitoring system is generally mounted in inquiry room comprising microphone, camera shooting Head, fiber optical transceiver etc. generally install interchanger, display, earphone and server etc. in the room of studying and judging, in interrogation suspect When, the face-image of the indoor perpetual object of inquiry (i.e. suspect) is obtained by camera, microphone is placed on suspicion of crime The front of people obtains the voice of perpetual object, is sent to interchanger by fiber optical transceiver later, studies and judges the staff of room i.e. The case where inquiry room being observed by earphone and display, and judge, this mode fully relies on experience, human interference factor It is larger.

However, microphone used in existing hearing room, generally existing single-grain-shaped platinum microphone, such microphone need To keep closer distance that could obtain sound with talker, the good suspect of quality early has a defence at heart, therefore When interrogating under such environment, it is difficult to make the judgement of preparation.And existing single-grain-shaped platinum microphone inhibits interference performance poor, It is easy that clearly voice can not be got by environmental disturbances.

In view of this, the present invention provides a kind of hearing monitoring system and array microphones.

Utility model content

In view of above-mentioned deficiencies of the prior art place, the purpose of this utility model is to provide a kind of hearing monitoring system with Array microphone can improve the ability that microphone inhibits environmental disturbances, to obtain clearly voice.

In order to solve the above technical problems, the utility model takes following technical scheme:

A kind of array microphone, including the first microphone module, second microphone module, DSP noise reduction module and amplification mould Block, the sound of perpetual object is picked up by first microphone module and second microphone module, and is exported to DSP noise reduction mould Block is inhibited the interference of environmental noise by the DSP noise reduction module, obtains the sound of perpetual object, and after amplification module amplifies Output.

As the improvement of the utility model, first microphone module includes the first microphone and first resistor, described The PWR foot of first microphone connects DSP noise reduction module by first resistor, and the SG foot of first microphone connects DSP noise reduction Module, the GND foot ground connection of first microphone.

As the improvement of the utility model, the second microphone module includes second microphone and second resistance, described The PWR foot of second microphone connects DSP noise reduction module by second resistance, and the SG foot of the second microphone connects DSP noise reduction Module, the GND foot ground connection of the second microphone.

It is further improved as the utility model, the amplification module is put including the first operational amplifier, the second operation Big device, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, rheostat, first capacitor and the second capacitor, The positive input terminal of first operational amplifier connects one end of the 6th resistance and one end of the 7th resistance, institute by 3rd resistor The other end for stating the 6th resistance is the input terminal of amplification module, the first feeder ear of connection, and the other end ground connection of the 7th resistance is described The negative input end of first operational amplifier passes sequentially through the 4th resistance, rheostat connects the output end and the of the first operational amplifier The positive input terminal of two operational amplifiers also passes sequentially through the 5th resistance and connects DSP noise reduction module with first capacitor, and the second operation is put The output end of the negative input end connection second operational amplifier of big device, the output end of second operational amplifier are connected by the second capacitor Connect the Wiring port of array microphone.

It is further improved as the utility model, the amplification module further includes third capacitor and the 4th capacitor, described One end of third capacitor connects one end of the 6th resistance and one end of the 7th resistance, the other end ground connection of the third capacitor, institute It is in parallel with third capacitor to state the 4th capacitor.

It is further improved as the utility model, the amplification module further includes the 8th resistance and the 9th resistance, described One end of 8th resistance connects one end of the second capacitor and one end of the 9th resistance, and the other end of the 8th resistance connects Wiring port The 4th foot, the 9th resistance the other end connection Wiring port the 2nd foot.

The improvement another as the utility model, the array microphone further include for powering to amplification module The input terminal of first power supply module and the second power supply module for powering to DSP noise reduction module, first power supply module connects Connect the Wiring port of array microphone, the input terminal and the second power supply module of the output end connection amplification module of the first power supply module Input terminal, the output end of the second power supply module connects DSP noise reduction module.

It is further improved as the utility model, first power supply module includes: the first voltage stabilizing chip, the 5th electricity Appearance, the 6th capacitor, the 7th capacitor, the 8th capacitor and diode, the cathode of the end the IN connection diode of first voltage stabilizing chip, Also by the 5th capacity earth, the diode just extremely the input terminal of the first power supply module, connect Wiring port the 1st Foot, the OUT terminal of the first voltage stabilizing chip are the first feeder ear, its second power supply module of connection and pass through the 6th capacity earth, also lead to Cross the 7th capacity earth, also by the 8th capacity earth.

It is further improved as the utility model, second power supply module includes: the second voltage stabilizing chip, the tenth electricity Resistance, eleventh resistor, twelfth resistor, the 9th capacitor, the tenth capacitor, the 11st capacitor, the 12nd capacitor, the 13rd capacitor and Power supply indicator, the anode of the end the IN connection power supply indicator of second voltage stabilizing chip simultaneously pass through the tenth resistance connection first The OUT terminal of voltage stabilizing chip, also by the 9th capacity earth, also by the tenth capacity earth, the cathode of the power supply indicator is logical Cross eleventh resistor ground connection, second voltage stabilizing chip the end GND connection twelfth resistor one end and the 11st capacitor one End, the other end of the 11st capacitor connect the OUT terminal of the second voltage stabilizing chip, one end of the 12nd capacitor and the 13rd capacitor One end, the other end of the twelfth resistor, the 12nd capacitor one end connect DSP noise reduction mould with one end of the 13rd capacitor Block and ground.

Meanwhile the utility model also provides a kind of hearing monitoring system, comprising: camera assembly, server and array microphone Wind, the camera assembly and array microphone are connect with the server.

Compared to the prior art, a kind of hearing monitoring system provided by the utility model and array microphone, array wheat Gram bellows chamber includes the first microphone module, second microphone module, DSP noise reduction module and amplification module, by first microphone Module and second microphone module pick up the sound of perpetual object, and export to DSP noise reduction module, by the DSP noise reduction module The interference for inhibiting environmental noise, obtains the sound of perpetual object, and export after amplification module amplifies.The utility model is by adopting Sound is picked up with two microphone modules, exports clearly sound after removal environmental noise is filtered by DSP noise reduction module Signal, then amplify to obtain the sound of perpetual object through amplification module, keep the sound of output apparent, and do interference performance By force.

Detailed description of the invention

Fig. 1 is the structural block diagram of array microphone provided by the embodiment of the utility model.

Fig. 2 is the circuit diagram of array microphone provided by the embodiment of the utility model.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.

Referring to Fig. 1, array microphone provided by the utility model includes the first microphone module 10, second microphone mould Block 20, DSP noise reduction module 30 and amplification module 40, the first microphone module 10 and second microphone module 20 are by described DSP noise reduction module 30 connects amplification module 40, and the amplification module 40 is connect with power supply/signal wire of array microphone, by sound Sound is output to backstage (such as, main frame, server).

Array microphone provided by the utility model is by first microphone module 10 and second microphone module 200 The sound of perpetual object is taken, and is exported to DSP noise reduction module 30, inhibits the interference of environmental noise by the DSP noise reduction module 30, The sound of perpetual object is obtained, and is exported after the amplification of amplification module 40, picks up sound by using two microphone modules, Between the two microphone modules and its region in front is set as phonetic incepting region, is filtered by DSP noise reduction module 30 The side sounds of two microphone modules, to export clear sound signal after removing environmental noise, then lossless through amplification module 40 Amplification keeps the sound of output apparent to obtain the sound of perpetual object, and it is strong to do interference performance.

Referring to Figure 2 together, first microphone module 10 includes the first microphone M1 and first resistor R1, and described the The PWR foot of one microphone M1 is connected by first resistor R1 connection DSP noise reduction module 30, the SG foot of the first microphone M1 DSP noise reduction module 30, the GND foot ground connection of the first microphone M1.

Correspondingly, the second microphone module 20 includes second microphone M2 and second resistance R2, second Mike The PWR foot of wind M2 connects DSP noise reduction by second resistance R2 connection DSP noise reduction module 30, the SG foot of the second microphone M2 Module 30, the GND foot ground connection of the second microphone M2.

In the present embodiment, the first microphone M1 and second microphone M2 are all made of silicon microphone, and silicon microphone is had The characteristics of some sizes are small and exquisite, lamprophonia, natural, readily discernible, reflowable welding, and the utility model uses two wheats Gram wind, between two microphones and its front is set as phonetic incepting region, so cut down two microphone sides to radio reception Effect, so as to obtain clearly sound at a distance, therefore the array microphone of the utility model can hidden installation, so as to The voice of perpetual object is accidentally obtained in perpetual object.

The DSP noise reduction module 30 mainly plays a filtering role, and is received between the phase of sound wave using two microphones Difference sound wave is filtered, environmental background sound can be filtered to greatest extent, only the remaining sound wave needed.First microphone M1 and second microphone M2 is picked up to after the sound of perpetual object, utilizes the difference between two microphones by DSP noise reduction module 30 Different, the sound of filtering environmental noise and other speakers make amplification module 40 obtain clearly audio signal.In the present embodiment, The DSP noise reduction module 30 can be used existing voice de-noising chip (such as: WT588D chip, FM1188-GE chip), RC filter Wave circuit, LC filter circuit etc., function and circuit connecting mode are the prior art, which has used very on mobile phone Maturation, and this part is also not the inventive point of the utility model, is not described in detail herein.

Please continue to refer to Fig. 1 and Fig. 2, the amplification module 40 includes the first operational amplifier A1, second operational amplifier A2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, rheostat Rs, first capacitor C1 With the second capacitor C2.

The positive input terminal of the first operational amplifier A1 passes through one end of the 6th resistance R6 of 3rd resistor R3 connection and the One end of seven resistance R7, input terminal, connection first feeder ear of the other end of the 6th resistance R6 for amplification module 40, the 7th The other end of resistance R7 is grounded, and the negative input end of the first operational amplifier A1 passes sequentially through the 4th resistance R4, rheostat Rs It connects the output end of the first operational amplifier A1 and the positive input terminal of second operational amplifier A2, also pass sequentially through the 5th resistance R5 DSP noise reduction module 30 is connected with first capacitor C1, the negative input end of second operational amplifier A2 connects second operational amplifier A2 Output end, the output end of second operational amplifier A2 passes through the Wiring port of the second capacitor C2 connection array microphone.

The utility model can be realized by two operational amplifiers and related resistors, capacitor C2 to the lossless of voice signal Amplification, to make the lamprophonia of amplification.In the present embodiment, the Wiring port of 4PIN, the 1st foot is can be used in the Wiring port Connecting power supply, the 2nd foot and the 4th foot is voice output, the 3rd foot ground connection, and Wiring port connects optical fiber transceiving by power supply/signal wire Device or data processing equipment (such as host computer) realize audio data transmission.

The first operational amplifier A1 and second operational amplifier A2 can be integrated in one piece of double operational chip (such as MC4558 Chip) in, to reduce its area for occupying pcb board, the 4th resistance R4, the 5th resistance R5 and rheostat Rs are the first operation The scale factor of amplifier A1 sets the times magnification of the first operational amplifier A1 by the resistance value of setting rheostat Rs when production Number.The first capacitor C1 mainly plays coupling, and the two-way audio information after DSP noise reduction module 30 is filtered is coupled as Audio signal all the way is output in the first operational amplifier A1.

Preferably, the amplification module 40 further includes third capacitor C3 and the 4th capacitor C4, the one of the third capacitor C3 One end of the 6th resistance R6 of end connection and one end of the 7th resistance R7, the other end ground connection of the third capacitor C3, the described 4th Capacitor C4 is in parallel with third capacitor C3.

The third capacitor C3 and the 4th capacitor C4 are played a filtering role, and are filtered out power supply peak thorn voltage, are put the first operation Big device A1, second operational amplifier A2 are stable and reliable in work.

Further, the amplification module 40 further includes the 8th resistance R8 and the 9th resistance R9, the 8th resistance R8's One end connects one end of the second capacitor C2 and one end of the 9th resistance R9, and the of the other end connection Wiring port of the 8th resistance R8 4 feet, the 2nd foot of the other end connection Wiring port of the 9th resistance R9.

8th resistance R8 and the 9th resistance R9 is current-limiting resistance, makes 2nd foot of the amplified audio signal from Wiring port It is exported with the 4th foot.

Please continue to refer to Fig. 1 and Fig. 2, the array microphone of the utility model further includes for powering to amplification module 40 First power supply module 60 and the second power supply module 70 for powering to DSP noise reduction module 30, first power supply module 60 Input terminal connect array microphone Wiring port, the first power supply module 60 output end connection amplification module 40 input terminal and The output end of the input terminal of second power supply module 70, the second power supply module 70 connects DSP noise reduction module 30.

Wherein, first power supply module 60 includes: the first voltage stabilizing chip U1, the 5th capacitor C5, the 6th capacitor C6, the 7th Capacitor C7, the 8th capacitor C8 and diode D1.Three-terminal regulator chip (such as 7809 chips) can be used in first voltage stabilizing chip U1, are used for Exporting 9V voltage is that the first operational amplifier A1 and second operational amplifier A2 provide operating voltage.

5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8 are filter circuit, the diode D1 Play one-way conduction, prevent electric current from flowing backward, external electrical device is avoided to damage.

The cathode of the end the IN connection diode D1 of the first voltage stabilizing chip U1 is grounded also by the 5th capacitor C5, described Diode D1 just extremely the input terminal of the first power supply module 60, connect Wiring port the 1st foot, the first voltage stabilizing chip U1's OUT terminal is the first feeder ear, its second power supply module 70 of connection and is grounded by the 6th capacitor C6, also by the 7th capacitor C7 Ground connection also passes through the 8th capacitor C8 ground connection.

Second power supply module 70 includes: the second voltage stabilizing chip U2, the tenth resistance R10, eleventh resistor R11, the tenth Two resistance R12, the 9th capacitor C9, the tenth capacitor C10, the 11st capacitor C11, the 12nd capacitor C12, the 13rd capacitor C13 and Power supply indicator D2.

Three-terminal regulator chip (such as 7805 chips) equally can be used in second voltage stabilizing chip U2, are for exporting 3.3V voltage DSP noise reduction module 30 provides operating voltage.9th capacitor C9, the tenth capacitor C10, the 11st capacitor C11, the 12nd capacitor C12, 13rd capacitor C13 is filter capacitor, plays power supply filter action.

The anode of the end the IN connection power supply indicator D2 of the second voltage stabilizing chip U2 simultaneously passes through the tenth resistance R10 connection The OUT terminal of first voltage stabilizing chip U1 is grounded, the power supply instruction also by the 9th capacitor C9 ground connection, also by the tenth capacitor C10 The cathode of lamp D2 is grounded by eleventh resistor R11, the end the GND connection twelfth resistor R12's of the second voltage stabilizing chip U2 One end of one end and the 11st capacitor C11, the OUT terminal of the second voltage stabilizing chip U2 of other end connection of the 11st capacitor C11, One end of 12nd capacitor C12 and one end of the 13rd capacitor C13, the other end, the 12nd capacitor of the twelfth resistor R12 One end of C12 connects DSP noise reduction module 30 and ground with one end of the 13rd capacitor C13.

In order to better understand the array microphone of the utility model, below in conjunction with Fig. 1 and Fig. 2 to the battle array of the utility model The working method of column microphone is described in detail:

Array microphone connects power supply by power supply/signal wire and transmission of speech signals, supply voltage connect through diode D1 Enter in array microphone, exports 9V voltage to amplification module 40 and the second power supply module 70 through 60 steady pressure treatment of the first power supply module Power supply, 9V voltage export 3.3V voltage and power to DSP noise reduction module 30 after the processing of 70 lowering and stabilizing blood pressure of the second power supply module.

The first microphone M1 and second microphone M2 are powered by DSP noise reduction module 30, in the first microphone M1 and Between two microphone M2 and its front formed a receiving area, and then cut down two microphone sides to radio reception effect.? When pickup, the voice signal of perpetual object is obtained simultaneously by two microphones, two wheats are utilized by DSP noise reduction module 30 later Gram wind receives the difference between the phase of sound wave and is filtered to sound wave, can to greatest extent filter environmental background sound, only The remaining sound wave needed, exports after later being amplified sound by amplification module 40, so that going out energy in a noisy environment It sounds hearer to be apparent, does not have noise.

Based on above-mentioned array microphone, the utility model also provides a kind of hearing monitoring system comprising camera assembly, Server and array microphone, the camera assembly and array microphone are connect with the server.It is obtained by camera assembly The facial expression of perpetual object, while being exported by the sound that array microphone obtains perpetual object to server, by server control Display screen processed shows video image, and by earphone or the sound (talking) of loudspeaker output perpetual object.Due to the array wheat Gram wind hereinbefore has been carried out detailed description, does not repeat herein.

In conclusion the utility model picks up sound by using two microphone modules, filtered by DSP noise reduction module Clearly voice signal is exported after processing removal environmental noise, then amplifies to obtain the sound of perpetual object through amplification module, To inhibit environmental noise, even cut down to close to zero, so that user keeps the sound exported apparent.Due to this reality With the strong antijamming capability of novel array microphone, the sound of perpetual object can be got at a distance, be not necessarily to and perpetual object Close contact, thus can hidden installation, so that perpetual object is not discovered it and speak monitored, can be widely used in hearing room It is used in equal places.

It is understood that for those of ordinary skills, can with technical solution according to the present utility model and The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model Scope of protection of the claims.

Claims (10)

1. a kind of array microphone, including the first microphone module, which is characterized in that further include second microphone module, DSP drop Module of making an uproar and amplification module are picked up the sound of perpetual object by first microphone module and second microphone module, and defeated Out to DSP noise reduction module, inhibits the interference of environmental noise by the DSP noise reduction module, obtain the sound of perpetual object, and through putting It is exported after big module amplification.

2. array microphone according to claim 1, which is characterized in that first microphone module includes the first Mike The PWR foot of wind and first resistor, first microphone connects DSP noise reduction module, first microphone by first resistor SG foot connect DSP noise reduction module, first microphone GND foot ground connection.

3. array microphone according to claim 2, which is characterized in that the second microphone module includes the second Mike The PWR foot of wind and second resistance, the second microphone connects DSP noise reduction module, the second microphone by second resistance SG foot connect DSP noise reduction module, the second microphone GND foot ground connection.

4. array microphone according to claim 3, which is characterized in that the amplification module includes the first operation amplifier Device, second operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, rheostat, the first electricity Hold and the second capacitor, the positive input terminal of first operational amplifier connect one end and the 7th of the 6th resistance by 3rd resistor One end of resistance, the other end of the 6th resistance are the input terminal of amplification module, the first feeder ear of connection, the 7th resistance it is another One end ground connection, the negative input end of first operational amplifier passes sequentially through the 4th resistance, rheostat connects the first operation amplifier The output end of device passes sequentially through the 5th resistance with the positive input terminal of second operational amplifier, also and connects DSP noise reduction with first capacitor Module, the output end of the negative input end connection second operational amplifier of second operational amplifier, the output of second operational amplifier End passes through the Wiring port of the second capacitance connection array microphone.

5. array microphone according to claim 4, which is characterized in that the amplification module further includes third capacitor and Four capacitors, one end of the third capacitor connect one end of the 6th resistance and one end of the 7th resistance, the third capacitor it is another One end ground connection, the 4th capacitor are in parallel with third capacitor.

6. array microphone according to claim 4, which is characterized in that the amplification module further includes the 8th resistance and One end of nine resistance, the 8th resistance connects one end of the second capacitor and one end of the 9th resistance, the other end of the 8th resistance Connect the 4th foot of Wiring port, the 2nd foot of the other end connection Wiring port of the 9th resistance.

7. array microphone according to claim 1, which is characterized in that further include first for powering to amplification module The input terminal of power supply module and the second power supply module for powering to DSP noise reduction module, first power supply module connects battle array The Wiring port of column microphone, the first power supply module output end connection amplification module input terminal and the second power supply module it is defeated Enter end, the output end of the second power supply module connects DSP noise reduction module.

8. array microphone according to claim 7, which is characterized in that first power supply module includes: the first pressure stabilizing Chip, the 5th capacitor, the 6th capacitor, the 7th capacitor, the 8th capacitor and diode, the end the IN connection two of first voltage stabilizing chip The cathode of pole pipe, also by the 5th capacity earth, the just extremely input terminal of the first power supply module, connection wiring of the diode 1st foot of port, the OUT terminal of the first voltage stabilizing chip are the first feeder ear, its second power supply module of connection and pass through the 6th capacitor It is grounded, also by the 7th capacity earth, also by the 8th capacity earth.

9. array microphone according to claim 8, which is characterized in that second power supply module includes: the second pressure stabilizing Chip, the tenth resistance, eleventh resistor, twelfth resistor, the 9th capacitor, the tenth capacitor, the 11st capacitor, the 12nd capacitor, 13rd capacitor and power supply indicator, the anode of the end the IN connection power supply indicator of second voltage stabilizing chip simultaneously pass through the tenth Resistance connects the OUT terminal of the first voltage stabilizing chip, also by the 9th capacity earth, also by the tenth capacity earth, and the power supply refers to Show that the cathode of lamp is grounded by eleventh resistor, one end of the end the GND connection twelfth resistor of second voltage stabilizing chip and the One end of 11 capacitors, the other end of the 11st capacitor connect one end of the OUT terminal of the second voltage stabilizing chip, the 12nd capacitor With one end of the 13rd capacitor, the other end of the twelfth resistor, one end of the 12nd capacitor and the 13rd capacitor one end Connect DSP noise reduction module and ground.

10. a kind of hearing monitoring system, comprising: camera assembly and server, which is characterized in that further include such as claim 1-9 Array microphone described in any one, the camera assembly and array microphone are connect with the server.