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A kind of audio signal analysis method

A technology of audio signal and analysis method, applied in speech analysis, instruments, etc., can solve the problems of reducing measurement speed, transmission time delay, multi-system resources, etc., and achieve the effect of improving accuracy, improving speed and accuracy, and saving space resources

Active Publication Date: 2018-12-28
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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AI Technical Summary

Problems solved by technology

[0006] In the traditional simple audio analysis and processing method, the increase in the amount of data transmitted by the low-frequency signal will inevitably consume more system resources when the digital signal circuit is dumped, and the transmission time will be delayed accordingly, reducing the measurement speed

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  • A kind of audio signal analysis method
  • A kind of audio signal analysis method

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0022] The audio signal analysis method of the present invention comprises the following steps:

[0023] 1. The first frequency prediction

[0024] In the audio analysis circuit, when the A / D circuit sends the sampled audio digital signal to the FPGA, the frequency of the input audio signal can be roughly judged by the zero-crossing detection statistical technique when the sampling rate is known.

[0025] 2. How to adjust the amount of transmitted data

[0026] When it is judged that the frequency of the audio input signal is low to a certain extent, the input data is extracted twice. Both the sampling rate and the amount of extracted data during this extraction are determined by the pre-judgment frequency. The FPGA will store and forward the extracted data to the CPU.

[0027] 3. The second frequency prediction

[0028] When the CPU receiv...

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Abstract

The present invention relates to an audio signal analysis method, comprising the following steps: Step 1, the first frequency prediction; Step 2, a method for adjusting the amount of transmission data; Step 3, the second frequency prediction; Step 4, the adjustment of the amount of analysis data . By dynamically adjusting the amount of transmitted data and the amount of analyzed data, the present invention can appropriately reduce the amount of transmitted data when processing low-end audio signals, which can not only save resources, but also shorten the signal transmission time, and achieve the purpose of improving the speed of audio analysis; The method of coordinating the analysis of the post-stage software dynamically adjusts the amount of data involved in the frequency domain transformation, and improves the accuracy of the whole frequency band analysis.

Description

technical field [0001] The invention relates to the technical field of audio signal analysis, in particular to an audio signal analysis method. Background technique [0002] In the field of low-frequency signal analysis, with the development of digital signal processing technology, it is necessary to sample audio signals in instruments such as oscilloscopes, audio voltmeters, audio frequency meters, and distortion meters, and then forward them to the CPU through digital circuits. The Fourier transform is performed by the software to realize the measurement of audio parameters in the frequency domain. [0003] When the frequency range of the audio signal is wide and the sampling rate of the external circuit is fixed, in order to take into account the measurement accuracy of the high-end signal, the external sampling rate is generally required to be high. For low-end audio signals, the number of sampling points per cycle is more. In the traditional measurement method, in ord...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/18
Inventor 刘娜肖唐良牛大胜杨青宫夏王蒙董守拯
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP