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Method for rapidly realizing speed shifting of audio signal

A voice signal, fast technology, applied in voice analysis, instruments, etc., can solve problems such as high computational complexity and difficult implementation

Inactive Publication Date: 2011-09-14
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology

Its calculation complexity is high, and it is difficult to implement on resource-constrained embedded devices based on low-power CPU platforms such as ARM and DSP

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  • Method for rapidly realizing speed shifting of audio signal
  • Method for rapidly realizing speed shifting of audio signal
  • Method for rapidly realizing speed shifting of audio signal

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Embodiment Construction

[0063] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0064] In the full search algorithm, the input signal needs to move the analysis window one by one to compare the consistency with the output signal, and find the sample point position with the largest corresponding normalized cross-correlation coefficient. At this time, an optimal search result is obtained. In this embodiment, a suboptimal search algorithm is used to obtain a matching result close to the optimum without introducing obvious subjective auditory distortion. Based on this idea, this embodiment adopts a two-stage search method. The first-level coarse-grained search can make the search step a constant, and then move the analysis window with this step as a unit to obtain the coarse-grained synchronization position; the second-level fine-grained search, the position obtained by the previous search Nearby, a fine-grain...

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Abstract

A method for quickly realizing speech signal speed change comprises the following steps that: during carrying out speed change processing of each frame of speech, a first stage search is carried out at first; an analysis window is moved according to a preset step length from the first sample point within the analysis window moving range in an input sequence; a first synchronous position at which the similarity between the previous Wov sample points of the analysis window and the previous Wov sample points of an output buffer memory is maximal is searched; then, a second stage search is carried out and the analysis window is moved point by point between the first synchronous position and one or two adjacent moving positions; a second synchronous position at which the similarity between theprevious Wov sample points of the analysis window and the previous Wov sample points of an output buffer memory is maximal is searched once again; then, the previous Wov sample points of the analysiswindow and the output buffer memory positioned at the second synchronous position are overlaid, wherein Wov is the length of the overlaid part of analysis speech and synthetic speech. The method can greatly reduce computation complexity.

Description

technical field [0001] The invention relates to voice technology, in particular to a method for quickly realizing voice signal speed change. Background technique [0002] The speed change operation of the voice signal refers to changing the time information of the signal playing without changing the pitch, timbre and other characteristics. There are many important applications, such as language learning machine, speech synthesis, karaoke, speech compression, audio and video signal synchronization in video editing, etc. [0003] The existing variable speed algorithms can be divided into two categories: one is based on time-domain overlap-add technology (OLA, Overlap-Add); the other is based on frequency-domain phase vocoder (Phase Vocoder) technology. Frequency domain technology uses Short Time Fourier Transform (STFT, Short time Fourier Transform), which is generally applicable to music signals and large-scale variable speeds. Generally speaking, frequency domain technology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/04
Inventor 冯宇红张晨
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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