CN202773062U

CN202773062U - High signal-to-noise ratio tracking directional sound collecting device

Info

Publication number: CN202773062U
Application number: CN 201220495982
Authority: CN
Inventors: 方楠
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-22
Filing date: 2012-09-22
Publication date: 2013-03-06
Anticipated expiration: 2022-09-22

Abstract

The utility model provides a high signal-to-noise ratio tracking directional sound collecting device which comprises a microphone array and a control box. The high signal-to-noise ratio tracking directional sound collecting device is characterized in that the microphone array is formed by 4 to 6 microphones with same size and performance and space lengths of 10 centimeters to 20 centimeters, and the microphones are fixed together; and the control box is internally provided with a preamplifier filtering preprocessing circuit, a digital signal processor (DSP) part and a power supply. The microphone array sends a collected voice signal to an amplifying and filtering circuit to carry out pretreatment, then a sound signal is subjected to A/D conversion and is sent to a digital signal processing system so as to realize an algorithm, and an output signal which is subjected to operation is subjected to D/A conversion and is outputted. The high signal-to-noise ratio tracking directional sound collecting device has the advantages that the voice of a speaker can be stripped, and an environmental noise is inhibited; the speaker is not restricted by a handheld microphone, and the degree of freedom of motions is increased; and a trouble of transferring the microphone back and forth in a traditional sound acquisition mode is avoided. The high signal-to-noise ratio tracking directional sound collecting device is convenient to install, and can be applied to places of a small stage, a platform, a multimedia classroom, a meeting room and a round-table conference.

Description

High s/n ratio is followed the tracks of orientation and is adopted sound equipment

Affiliated technical field

The utility model belongs to technical field of telecommunications, relates in particular to a kind of voice capture device of microphone.

Background technology

In the relevant occasion of numerous voice, people generally use microphone as the voice pick tool.Voice collecting generally still utilizes single isolated microphone to pick up at present, isolated microphone can pick up any sound in the pickup scope, simultaneously inevitably pick up noise, but people are usually only interested in the one or more speakers in these information sources; Simultaneously since the speaker may walk about among a small circle indoor, and the signal that the situations such as the multipath reflection of indoor various other sound and reverberation all can cause the fixing microphone in single position to receive is not ideal enough, thereby cause voice communication quality to worsen, sometimes so that interested speaker's sound be difficult to not hear.The fixing conventional microphone in position can't isolate different sound, can't the establishment noise, and can't aim at all the time and follow the tracks of interested speaker.

If change the sound mode of adopting of traditional single microphone, utilize a plurality of microphones to pick up voice, line up a plurality of microphones linear or annular array, can process by the voice signal that reaches intelligence in conjunction with Array Signal Processing.Array Microphone to receive from space different directions empty the time signal process, can and improve signal to noise ratio from motion tracking speaker's direction and change in location.Therefore, the product based on microphone array can extensively be used in the voice communication environment with noisy background, such as meeting-place, multi-media classroom, vehicle-carried hands-free telephone and hearing aids etc.But utilize a plurality of microphones and when processing in conjunction with the circuit of Array Signal Processing, fix respectively the relative position of each microphone, cumbersome, and cost is higher.

Summary of the invention

Problem to be solved in the utility model provide a kind of cheap, adopt the voice pick device that the sensitive and orientable tracking of sound gathers sound, suppresses environmental noise.

The technical scheme that its technical problem that solves the utility model adopts is: high s/n ratio is followed the tracks of orientation and is adopted sound equipment, comprise microphone array, control box, it is characterized in that: microphone array by 4-6 size, performance all identical and spacing 10-20 centimetre of microphone that is fixed together consist of; Be provided with preposition amplification filtering pre-process circuit and digital signal processor (DSP) part and power management module in the control box.

Further design of the present utility model, in the described preposition filtering and amplifying circuit gain of each microphone respective channel identical, and it is adjustable to gain; Described microphone is electret microphone; Described digital signal processor (DSP) uses floating-point signal processor ADSP21479, and A/D and D/A module adopt audio codec AD1939.

Power management module can provide for each microphone+voltage of 5V, for filtering and amplifying circuit carry+15V and-bias voltage of 15V, give simultaneously the power supply of DSP and loudspeaker.

The sound signal processing of amplification filtering module to collecting filters high frequency, and amplifies the signal that collects.

Signal process part is take Floating-point DSP---ADSP-21479 is the core of whole system, finish the execution of algorithm, and controlling the co-ordination of whole system, use audio codec AD1939 and RCA terminal to carry out the voice collecting signal in the system and process and realize A/D, D/A translation function.

Above-mentioned power management module, filtering and amplifying circuit, DSP module all are arranged in the control box.

The utility model operation principle is as follows: behind the plugged, each module comes into operation, microphone array is transferred to filtering and amplifying circuit with the voice signal that collects and is carried out preliminary treatment, voice signal after the processing is sent to digital information processing system (DSP) with implementation algorithm after the A/D conversion, output signal behind the implementation algorithm is exported after through the D/A conversion, just can be played out by sound equipment that the loudest people's of sound that speaks in the environment sound, when the talker walks about, system can be from the position of motion tracking talker sound, and suppressed the sound of other directions, so that sound is more clear.Above-mentioned algorithm autocorrelation matrix (SMI) algorithm of inverting that refers to sample, moving this algorithm can be in the hope of talker place direction, and then tries to achieve the weights of each microphone in the microphone array, just can obtain talker's voice signal after the weighted sum.

The beneficial effects of the utility model are: the sound that can collect the microphone array of fixed position is processed, and separates talker's sound, suppresses environmental noise; Can collect very delicately the sound of specific direction within 3 meters, make the talker break away from the constraint of handheld microphone, increase the movable degree of freedom; Can automatically shift, follow the tracks of, locate each teller's sound when many people talk, avoid tradition to adopt the trouble that the sound mode is transmitted microphone back and forth.The utility model is installed and put conveniently, and is with low cost, applicable to places such as woodwing, dais, multi-media classroom, meeting room and roundtable conferences.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Among the figure, the 1-microphone array, the 2-control box, 3-inputs audio port, 4-output audio mouth, 5-switch, 6-power supply indicator, 7-volume knob.

Embodiment

As shown in Figure 1, the utility model comprises microphone array 1, control box 2, it is characterized in that: microphone array 1 by 4 sizes, performance all identical and spacing 10-20 centimetre of microphone that is fixed together consist of; Be provided with 4 tunnel preposition amplification filtering pre-process circuits and digital signal processor (DSP) and power management module in the control box 2.The gain of each microphone respective channel is identical in the preposition filtering and amplifying circuit, and it is adjustable to gain.The floating-point signal processor ADSP21479 that described digital signal processor (DSP) uses U.S. ADI company to produce, A/D and D/A module adopt audio codec AD1939.Power management module can provide for each microphone+voltage of 5V, for filtering and amplifying circuit carry+15V and-bias voltage of 15V, power for simultaneously digital signal processor (DSP) and loudspeaker.

Microphone array is fixed on the support of a linear pattern or circular arc type, is provided with input audio port 3, output audio mouth 4, switch 5, power supply indicator 6 and volume knob 7 on the control box 2.

The used element optimization technique of the utility model standard component, first-class such as the RCA lotus flower, easily realize volume production, also can reduce cost.

During use, microphone array and support thereof are placed in a fixing position, such as being placed in dais or the meeting room on the desk, the audio output apparatus such as output audio mouth and room sounding or earphone couple together.Behind plugged, open switch 5, power supply indicator 6 is bright, just can work, and gets final product real-time tracking, collects the talker's sound from all directions, and suppress environmental noise.

Claims

1. high s/n ratio is followed the tracks of orientation and is adopted sound equipment, comprises microphone array (1), control box (2), it is characterized in that: microphone array (1) by 4-6 size, performance all identical and spacing 10-20 centimetre of microphone that is fixed together consist of; Be provided with the preposition amplification filtering pre-process circuit in 4-6 road and digital signal processor and power management module in the control box (2).

2. high s/n ratio according to claim 1 is followed the tracks of orientation and is adopted sound equipment, it is characterized in that: in the described preposition filtering and amplifying circuit gain of each microphone respective channel identical, and it is adjustable to gain.

3. high s/n ratio according to claim 1 and 2 is followed the tracks of orientation and is adopted sound equipment, and it is characterized in that: described microphone is electret microphone.

4. high s/n ratio according to claim 1 and 2 is followed the tracks of orientation and adopted sound equipment, it is characterized in that: described digital signal processor uses floating-point signal processor ADSP21479, and A/D and D/A module adopt audio codec AD1939.

5. high s/n ratio according to claim 1 and 2 is followed the tracks of orientation and is adopted sound equipment, and it is characterized in that: described microphone array is fixed on the support of a linear pattern or circular arc type; Be provided with input audio port (3), output audio mouth (4), switch (5), power supply indicator (6) and volume knob (7) on the control box (2).