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Signal processing method and device

A signal processing and envelope signal technology, applied in the field of signal processing, can solve the problems of less effective quantization digits and small signal noise pollution, and achieve the effects of avoiding amplification, reducing frequency distortion, and improving the quantization signal-to-noise ratio

Inactive Publication Date: 2009-05-27
VIMICRO CORP
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Problems solved by technology

In this way, for an input signal with a large amplitude, due to the large number of effective quantization bits, a higher SNR can be obtained; while for an input signal with a smaller amplitude, the effective quantization bits are relatively small, so after the signal is quantized, only A lower SNR can be obtained, and it may even occur that small signals are completely contaminated by noise after quantization

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  • Signal processing method and device
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Embodiment Construction

[0038]Automatic Gain Control (AGC, Automatic Gain Control) is an algorithm that adjusts the signal amplitude by changing the gain (Gain) value of the input signal, so that the signal amplitude is limited within a fixed range. At present, the application of the AGC algorithm in the audio field is mostly used to adjust the loudness of the audio signal, so that the volume of the signal can be kept at a stable loudness, instead of being suddenly large or small. The invention utilizes the characteristic that the AGC can dynamically adjust and keep the signal state stable, and dynamically adjusts the amplitude of the analog audio signal.

[0039] The core idea of ​​the present invention is to amplify the analog audio signal before converting it, then convert the amplified analog audio signal into a digital audio signal, and shrink the converted digital audio signal according to the previously amplified ratio. Here, the ratio of amplifying the analog audio signal and the ratio of red...

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Abstract

The invention relates to a signal processing method, which comprises that: A, amplifying analogue signal according present increment value, to be converted into digit signal; B, reducing said digit signal according to present increment value to be output, and outputting new increment value based on the digit signal, using said new increment value to refresh present increment value when the analogue signal is zero, feeding back to step A. The invention also provides a signal processor, which can dynamically adjust the reduce ratio of input signal according to the amplitude of input signal, to improve the signal / noise ratio.

Description

technical field [0001] The invention relates to signal processing technology, in particular to a signal processing method and device for improving the signal-to-noise ratio of analog-to-digital conversion (A / D). Background technique [0002] With the development of signal digitization, because digital signals such as digital audio signals are more convenient in transmission, stronger in anti-interference, more reliable, faster in processing speed and higher in precision, it is often necessary to convert analog signals into Digital signals are transmitted and processed. In the prior art, the process of converting an analog signal into a digital signal is very simple. Generally, an analog-to-digital converter (ADC) is directly used to perform analog-to-digital conversion on an input analog signal, and the output digital signal continues to be processed. However, in the process of converting an analog signal into a digital signal through an ADC, quantization noise is usually i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08H03M1/12H04L25/08
Inventor 郦文其冯宇红
Owner VIMICRO CORP
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