Audio speed changing method

Abstract

The invention relates to an audio speed changing method which comprises the following steps: inputting original audio data into an audio buffer area at a certain speed according to a speed change requirement; searching optimal registration data for copying a fixed length in the audio buffer area; and outputting the optimal registration data after overlying the data in a fade-in fade-out mode. The audio speed changing method can change the audio speed by only changing the input speed of an original signal, does not use a basic parameter of a voice signal and has simple calculation, high precision, stepless speed change, real time, high tone quality and wide advisable range of speed change factors. Meanwhile, the audio speed changing method is suitable for audio signals of different sample rates and different sampling point location lengths and various audios comprising voice and music.

Description

technical field [0001] The invention relates to digital signal processing, in particular to an audio speed changing method. Background technique [0002] Language learners at different levels have different acceptance levels for speaking speed. Beginners, need to listen to a slower speaking speed, easy to learn and understand. Intermediate learners require a slightly higher speaking rate, while advanced learners listen to a faster than normal speaking rate. In response to this demand, many manufacturers have introduced electronic devices with language learning functions. Such devices have a voice variable speed function, which can play pre-stored voice data or recorded voice data at variable speeds. Users can change the playback speed of the speech according to different needs to achieve the purpose of helping language learning. [0003] Although these language learning electronic devices have variable-speed playback functions, they generally have some disadvantages: [...

AI Technical Summary

Problems solved by technology

This method introduces severe inflection of speech

[0005] 2. Based on the MCU chip, it is equipped with some signal processing algorithms to realize speed change. Although these methods can also realize voice speed change, the range of speed change is limited, or when the speed change range is large enough, the sound will be changed or distorted.

Failure to meet the needs of more users to learn the language

[0006] 3. The voice bandwidth supported by variable speed is limited, and it cannot support wideband audio with a sampling rate of 44100Hz

[0007] In addition, the Chinese invention patent application "method of voice speed change", publication number CN101202048, discloses a voice speed change method, according to the voice basic cycle to find the voice segment and then process the voice segment, each person's voice characteristics are different, the basic cycle is also different, so this method is complicated to implement, and it is only suitable for speech, not for music

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