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Voice A/D conversion method and device

An analog-to-digital conversion and voice technology, applied in voice analysis, instruments, incremental modulation, etc., can solve the problems of poor voice effect and low signal-to-noise ratio of voice digital signals, reduce quantization errors, eliminate high-frequency noise, reduce The effect of small overdrive distortion

Inactive Publication Date: 2009-08-05
ARKMICRO TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low signal-to-noise ratio and slightly poor voice effect of the voice digital signal obtained by adaptive incremental modulation coding modulation

Method used

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  • Voice A/D conversion method and device

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Embodiment Construction

[0022] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Voice analog-to-digital conversion device of the present invention, such as figure 1 As shown, it includes a comparator 101, a sampling module 102, a delta modulation module 103, a downsampling filter module 104 and a D / A conversion module 105;

[0024] Wherein, the delta modulation module 103 includes a scale control module 201 and an integrator 202; the downsampling filter module 104 adopts a two-stage or multi-stage half-band filter cascaded form.

[0025] The specific workflow of the voice analog-to-digital conversion device is as follows:

[0026] First, the analog voice signal X1 (t) is input into the comparator 101, and compared with the predicted analog voice signal X2 (t) in the comparator 101; wherein the predicted analog voice signal X2 (t) is sampled by the sampling module 102, increased Modulated by the vol...

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Abstract

The invention discloses a voice analog-to-digital conversion method, which comprises the steps of firstly carrying out over-sampling to a comparison result between an input analog voice signal and a predictive analog voice signal, then carrying out adaptive delta modulation to an output digital voice signal after sampling, and finally carrying out de-sampling filtration processing to the digital voice signal after the adaptive delta modulation and outputting the signal. The method utilizes over-sampling technology, thus being easy for realization in actual chips; as the frequency of the voice signal is relatively low, the over-sampling technology is easy for realization; when sampling interval is lowered down to a certain value, the difference value of two adjacent sampling points can be lowered down to be within a certain extent, source signals can be approximately tracked more precisely, thus reducing quantization error; the improving of the sampling frequency can lower noise power in a signal frequency band, quantization noise after over-sampling is expanded to be within a wider frequency band range, while the signal power within the signal frequency band dose not change, thus improving the signal-to-noise rate of the signal.

Description

technical field [0001] The invention relates to a method and device for converting voice analog signals into digital signals in the field of voice processing, in particular to a method and device for digital-to-analog conversion based on adaptive incremental modulation coding. Background technique [0002] With the development of multimedia technology and video electronic products, cameras have been used more and more in many fields. At present, the cameras on the market mainly realize the transmission of video streams and image display on the host side through the USB interface. Most of the The camera has no audio function or the microphone is directly connected to the computer sound card as the audio input, and a more complicated and costly audio codec is also used as the audio analog-to-digital conversion device. In addition, the use of the audio function of the camera is mainly focused on the voice sampling coding and transmission. The digital voice signal obtained after...

Claims

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Application Information

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IPC IPC(8): G10L19/14G10L19/04H03M3/02
Inventor 胡亮李汉光罗碧强刘敬波彭亮石岭
Owner ARKMICRO TECH
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