CN201830414U

CN201830414U - Sound pickup

Info

Publication number: CN201830414U
Application number: CN2010205781885U
Authority: CN
Inventors: 龙罡
Original assignee: GUANGZHOU HAOYUN SCIENCE AND TECHNOLOGY ENGINEERING Co Ltd
Current assignee: Polytron Technologies Inc
Priority date: 2010-10-27
Filing date: 2010-10-27
Publication date: 2011-05-11
Anticipated expiration: 2020-10-27

Abstract

The utility model discloses a sound pickup solving the problems of the existing sound pickup that for the recorded sound, the background noise is high, the sound is distorted, and the like. The sound pickup comprises four parts, namely an audio collecting unit, an audio encoding/decoding unit, an audio processing unit and an amplification driving unit, wherein the audio collecting unit comprises a microphone a and a microphone b which are used for collecting ambient sound, and a microphone pre-amplifying circuit for converting impedance; the audio encoding/decoding unit comprises a high-sampling-rate encoder and a high-sampling-rate decoder; the audio processing unit comprises an automatic gaining control module, a voice detecting module, a noise reducing module and a voice booster module; and the amplification driving unit comprises a back-stage amplifying circuit and a long-line driving circuit. The sound pickup can effectively remove the background noise and can pick up sound in a large range without the influence of distance.

Description

Pick-up

Technical field

The utility model relates to a kind of pick-up, is specifically related to a kind of pick-up that drives function with noise reduction, voice enhancing and long line.

Background technology

At existing ambience listening pick-up, generally carry out pickup, and directly amplify output by analog circuit.There are some problems in this processing mode:

1. be limited to reasons such as cost and small product size, the miaow head can not select fidelity very high.Cause pickup effect and actual sound all to have certain difference.And can not ensure the quality of products in the time of can not recording on a large scale, sound at a distance will be recorded clearly as wanting, nearby sound is with regard to excessive and distortion easily.If it is undistorted that sound nearby will guarantee, then Yuan Chu wave volume is very little.

2. the sound under the general record of the pick-up of existing scheme all exists very big background noise.When having a strong impact on playback to the identification of voice intercommunication content.One's voice in speech is flooded foam in noise a long way off, can not hear clearly.The noise reduction of general simulation Dolby circuit is unsatisfactory.The general person is based on analog filter.Design is complicated, simultaneously response and bad.Generally can cause the high frequency while partial loss of voice.The sound oppressiveness.

3. existing pick-up exists after long Distance Transmission, the problem of sound meeting distortion.The audio distortions of recording out also is mixed with circuit noise.

The utility model content

It is true that the purpose of this utility model provides a kind of sound of collection, and can record on a large scale.Simultaneously can be through not causing the pick-up of distortion after the longer Distance Transmission.

In order to reach above-mentioned purpose of design, the technical solution adopted in the utility model is as follows:

A kind of pick-up comprises the audio collection unit, is used to gather ambient sound and will rises be converted to the signal of telecommunication and be sent to the audio coding decoding unit;

Audio treatment unit is used to receive audio signal that audio coding unit sends and audio frequency is carried out passing the audio coding decoding unit back behind time domain-frequency domain transform;

The audio coding decoding unit, be used to receive and be sent to audio treatment unit after the signal of telecommunication that is transmitted the audio collection unit is encoded to it, passing back to the audio coding decoding unit after audio treatment unit is handled again, decodes and changes into analog signal in the audio coding decoding unit.

Amplify driver element, be used for the analog signal of audio coding decoding unit after to audio signal decoding is amplified to relative circuit output level amplitude;

Wherein said audio collection unit, audio coding decoding unit, audio treatment unit, amplification driver element are electrically connected.

Further, described audio collection unit is made up of two super large vibrating diaphragm high sensitivity condenser type miaow head a, miaow head b and corresponding pre-amplifying circuit thereof.

Further, described audio coding decoding unit comprises: high-precision encoder and decoder.

Further, audio treatment unit comprises: automatic gain control module, voice detection module that circuit connects.

Further, amplifying driver element comprises: back level amplifying circuit and long line drive circuit.

Further, the sensitivity of described audio collection unit miaow head a for-50dB～-53dB is used to gather sound at a distance, the sensitivity of miaow head b be 59dB～-62dB is used for being responsible for gathering sound nearby.

Further, described audio coding decoding unit has possessed coding and decoding function simultaneously, the highest support 96K sampling.

Further, described audio coding decoding unit use is 44.1K 16BIT sampling.

Further, described audio treatment unit also includes noise reduction module and the voice enhancing module that is connected with described automatic gain control module, voice detection module circuit.

Further, the described amplification driver element way of output adopts the output of current mode, and output can be not less than 500 meters by driver circuit.

The beneficial effect of pick-up described in the utility model is: by the configuration and the hybrid algorithm of two miaow heads, make collecting that far and near sound all can be complete, can accomplish on a large scale pickup and be not subjected to distance affects.By automatic gain control function, solve the tangible problem of volume difference of far and near sound.Have simultaneously that voice is clear, background noise is little, long line transmits distortionless advantage.By digital Audio Processing, avoid introducing line noise in the signal operation process.And handle flexibly, can according to circumstances change Processing Algorithm flexibly.

Description of drawings

Fig. 1 is a workflow schematic diagram of the present utility model.

Embodiment

Below in conjunction with Figure of description embodiment of the present utility model is done detailed description.Obviously, described embodiment only is a part of embodiment of the present utility model, and other embodiment that those skilled in the art is obtained under the prerequisite of not paying creative work belongs to protection range of the present utility model.

Pick-up partly is made up of audio collection unit, audio coding decoding unit, audio treatment unit, amplification driver element four as shown in Figure 1.

Described audio collection unit comprises the pre-amplifying circuit of miaow head that two complementary types, super large vibrating diaphragm high sensitivity condenser type miaow head and the level that are used to gather ambient sound and impedance transformation are used.Described audio coding decoding unit comprises high-precision encoder, the decoder of high sampling rate.Described audio treatment unit comprises that automatic gain control module, voice detection module, noise reduction module, voice strengthen module; Described amplification driver element comprises back level amplifying circuit and long line drive circuit.

The pre-amplifying circuit of miaow head that the audio collection unit is used by two parameters miaow head a inequality and miaow head b and impedance transformation is formed, and the pre-amplifying circuit of described miaow head provides biasing and signal adjustment for the miaow head; Miaow head a be high-gain (50dB～-53dB) the main sound at a distance of gathering, miaow head b be low gain (59dB～-62dB), the main sound of gathering nearby, two miaow head parameters are complementary to form a complete sound collection scheme; The miaow head needs correct biasing circuit just can obtain correct gain and working point.The output level of miaow head is very little simultaneously, output impedance is very big.For guaranteeing that coding unit can obtain bigger dynamic range, just miaow head signal must be amplified to coding unit acceptable scope, reduce the output impedance of signal simultaneously, pre-amplifying circuit has just been finished two above-mentioned functions, for the signal that guarantees two miaow heads does not disturb mutually, they have separately biasing and pre-amplifying circuit.

The audio coding decoding unit adopts integrated IC.It can support the coding and the two-way audio signal decoding of two-way audio signal simultaneously.Support the sample rate of CD Quality simultaneously.DSP algorithm intensity and tonequality requirement are considered in the highest support 96K sampling, adopt 44.1K 16BIT sampling, have reached the tonequality of CD.IC supports the data/address bus of DSP simultaneously, carries out the transmission of digital signal by data/address bus and DSP.

Audio treatment unit is the core of system, and it finishes all functions by a DSP.The high-speed computation ability of DSP is fit to audio frequency is carried out time domain-frequency domain transform and based on the various algorithms on this basis.

The digital audio and video signals input and output obtain digital audio and video signals from encoder and handle.And result is delivered to decoder become analog signal.

Mix, the digital audio and video signals of two complementary type miaow head a and miaow head b enters DSP respectively.According to frequency response curve separately, the sensitivity separately of two miaow heads, dispose different weights and mix.Obtain complete audio signal.

Automatic gain control (AGC), audio signal also will be carried out digital gain in DSP inside behind pre-the amplification.Digital gain can carry out AGC control with algorithm, the amplification that too small signal can be suitable, the decay that excessive signal can be suitable, small signal can not heard by the assurance system, and signal post-amplifier can blasting when excessive.

People's sound detection, when pick-up need not heard the dialogue of people in the environment, the voice detection algorithm can extract people's acoustic frequency from noise, provided reference for the noise reduction of back and voice strengthen.

Noise reduction, decrease of noise functions reduces influence of environmental noise.Decrease of noise functions has will remove two kinds of noises.A kind of is the ambient noise that continues.Generally be the noise or the very wide noise of frequency spectrum of fixed frequency.A kind of is the noise that takes place suddenly.The feature of general this noise nobody audio spectrum.These two kinds of noises all may draw by the analysis to frequency domain, and they are decayed.

Voice strengthens, and based on human auditory system curve and pick-up frequency response curve, digital audio signal is carried out suitable weighting equilibrium, some frequencies is promoted the more melodious and easier identification of the voice that people's ear is heard.

Back level is amplified the analog signal after driver element obtains handling from audio decoder, and it is amplified to relative circuit output level amplitude, because generally when project installation, there is very long distance in regular meeting between pickup place and the sound pick-up outfit.General voltage-type output type of drive, because the impedance of circuit can become bigger under the long situation of circuit, and be interfered easily, so the way of output adopts the way of output of current mode, it is subjected to the influence of line impedance little, it is strong simultaneously also to export anti-circuit interference capability than voltage-type, adopts current mode output to drive and also can not cause noise and the distortion that people's ear is discovered on 500 meters transmission line.

More than; it only is preferred embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claim was defined.

Claims

1. a pick-up is characterized in that, described pick-up comprises: the audio collection unit is used to gather ambient sound and will rises and is converted to the signal of telecommunication and is sent to the audio coding decoding unit;

The audio coding decoding unit, be used to receive and be sent to audio treatment unit after the signal of telecommunication that is transmitted the audio collection unit is encoded to it, passing back to the audio coding decoding unit after audio treatment unit is handled again, decodes and changes into analog signal in the audio coding decoding unit;

2. pick-up according to claim 1 is characterized in that: described audio collection unit is made up of two super large vibrating diaphragm high sensitivity condenser type miaow head a, miaow head b and corresponding pre-amplifying circuit thereof.

3. pick-up according to claim 1 is characterized in that: described audio coding decoding unit comprises: high-precision encoder and decoder.

4. pick-up according to claim 1, it is characterized in that: audio treatment unit comprises: automatic gain control module, voice detection module that circuit connects.

5. pick-up according to claim 1 is characterized in that: amplify driver element and comprise: back level amplifying circuit and long line drive circuit.

6. pick-up according to claim 2 is characterized in that: the sensitivity of described audio collection unit miaow head a for-50dB～-53dB is used to gather sound at a distance, the sensitivity of miaow head b be 59dB～-62dB is used for being responsible for gathering sound nearby.

7. according to claim 1 or 3 described pick-ups, it is characterized in that: described audio coding decoding unit adopts has possessed coding and decoding function simultaneously, the highest support of described encoder 96K sampling.

8. pick-up according to claim 7 is characterized in that: what described audio coding decoding unit used is 44.1K 16BIT sampling.

9. pick-up according to claim 4 is characterized in that: described audio treatment unit also includes the noise reduction module and the voice that are connected with described automatic gain control module, voice detection module circuit and strengthens module.

10. pick-up according to claim 5 is characterized in that: the described amplification driver element way of output adopts the output of current mode, and output can not be higher than 500 meters by driver circuit.