Zooming method and device for time scale and frequency scale of audio signal

Abstract

The invention relates to a zooming method and device for a time scale and a frequency scale of an audio signal, wherein the zooming method for the time scale and the frequency scale of the audio signal comprises the following steps of: sampling an input audio signal so as to generate an audio time domain signal to be processed, wherein the inter-frame space of the audio time domain signal to be processed is L, and each frame comprises N sampling points; converting the audio time domain signal to be processed into an audio frequency domain signal to be processed; obtaining the frequency and amplitude of the audio frequency domain signal to be processed; obtaining a reestablishing frequency and a reestablishing amplitude of a target audio frequency domain signal; converting the target audiofrequency domain signal with the reestablishing frequency and the reestablishing amplitude into a target audio time domain signal; and superposing and accumulating the target audio frequency domain signal to obtain an output audio signal with M output points, wherein M is not greater than N / 2. An implementation mode of the technical scheme is lower in complexity, the processing quality is high and the time scale and the frequency scale of the audio signal can be independently adjusted.

Description

technical field [0001] The invention relates to the field of audio signal processing, in particular to a method and device for zooming and processing audio signal time scale and frequency scale. Background technique [0002] In various multimedia applications, it is widely required to adjust the time scale or frequency of audio signals. Take adjusting the playback speed as an example, such as reducing the playback speed of the audio signal, that is, lengthening the time scale of the signal, which can help people with hearing or comprehension impairments to improve the intelligibility of listening, and it is also helpful for foreign language beginners. Scholars' learning, improving the playback speed of audio signals, that is, compressing the time scale of signals can help listeners save time in obtaining information from recordings; adjusting the sound speed and pitch of music playback can also change the rhythm and timbre of music, Obtain a unique artistic effect; for the ...

AI Technical Summary

Problems solved by technology

In order to obtain high processing sound quality, the short-time Fourier transform of this type of algorithm needs to process a long audio at a time, which has a large amount of calculation and storage, and there is no solution to the phase discontinuity between frames. heavily restricted

[0005] For more technical solutions about digital signal audio speed change processing, please refer to the patent application document of "method for voice speed change" with publication number CN101202048A, but the above problems are still not solved

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