Audio signal processing method and device and storage medium
An audio signal and signal technology, applied in the field of signal processing, can solve problems such as low naturalness
Active Publication Date: 2018-02-23
GUANGZHOU KUGOU TECH
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Problems solved by technology
[0006] The invention provides a method, device and storage medium for processing audio signals, which can solve the problem of low naturalness
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0064] In this embodiment of the present invention, processing an audio signal refers to processing the audio signal with variable speed and constant pitch. Wherein, the variable-speed and pitch-invariant processing refers to only changing the pitch of the audio signal without changing the timbre of the audio signal. The pitch is represented by the excitation spectrum of the audio signal, while the timbre is represented by the spectral envelope of the audio signal. Therefore, when processing an audio signal, only the excitation spectrum of the audio signal needs to be changed, and the spectrum envelope of the spectrum signal does not need to be changed.
[0065] The method for processing an audio signal can be applied to a specified a...
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The invention discloses an audio signal processing method and device and a storage medium, and belongs to the signal processing field; the method comprises the following steps: modifying tones for a to-be-processed first audio signal so as to obtain a second audio signal; extracting a first frequency spectrum envelope and an excitation spectrum from the second audio signal, wherein the first frequency spectrum envelope is matched with the audio signal tone, and the excitation spectrum is matched with the audio signal pitch; restoring the first frequency spectrum envelope so as to obtain a second frequency spectrum envelope; forming a third audio signal according to the second frequency spectrum envelope and the excitation spectrum. The first audio signal is modified in tones so as to obtained the second audio signal; the excitation spectrum and the first frequency spectrum envelope are isolated from the second audio signal, so the excitation spectrum and the first frequency spectrum envelope are matched on the time domain; the first frequency spectrum envelope is restored without changing the frequency spectrum envelope time domain, so the naturalness of the third frequency spectrum signal formed by the excitation spectrum and the second frequency spectrum envelope is not affected, thus improving the naturalness of the formed third audio signal.
Description
technical field [0001] The present invention relates to the field of signal processing, in particular to a method, device and storage medium for processing audio signals. Background technique [0002] With the development of terminal technology, the terminal can not only record audio signals, but also process the recorded audio signals. For example, the audio signal is processed without changing the pitch without changing the speed. Wherein, the process of transposing the pitch without changing the speed refers to changing the pitch of the audio signal without changing the timbre of the audio signal. [0003] In the prior art, the process for the terminal to transpose the first audio signal to be processed without changing the speed is as follows: the terminal extracts the spectrum envelope of the first audio signal from the first audio signal, and the spectrum envelope corresponds to the tone and timbre of the audio signal. The terminal extracts the first excitation spect...
Claims
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Login to View More IPC IPC(8): G10L21/007H04M1/725H04M1/72433
CPCG10L21/007H04M1/72433
Inventor 肖纯智
Owner GUANGZHOU KUGOU TECH