Speech processing method and system for increasing Chinese tone recognition rate based on frequency shift processing

Abstract

The invention discloses a speech processing method and system for increasing the Chinese tone recognition rate based on frequency shift processing. The method comprises the following steps that M usable electrodes and H movable electrodes are determined, and therefore M-H electrodes exist in a fixed electrode sequence; changes of the fundamental frequency are detected according to the reference fundamental frequency and are expressed in percentage; when H is 2, the fixed electrode sequence is shifted if the change of the fundamental frequency exceeds 20% of the reference fundamental frequency; when H is 4, the fixed electrode sequence is shifted if the change of the fundamental frequency exceeds 15% of the reference fundamental frequency; when H is 6, the fixed electrode sequence is shifted if the change of the fundamental frequency exceeds 10% of the reference fundamental frequency; after the fixed electrode sequence is determined, N channels with the maximum energy are selected to be subjected to stimulation. According to the speech processing method and system for increasing the Chinese tone recognition rate based on frequency shift processing, the integral position of stimulating electrodes is changed according to the changes of the fundamental frequency of input sound signals so that the information of frequency changes in the sound signals can be transmitted, and finally the result of increasing the Chinese tone recognition rate is achieved.

Description

technical field

[0001] The invention belongs to the field of medical devices, in particular to a speech processing method and system for improving the recognition rate of Chinese tones based on frequency shift processing. Background technique

[0002] For English speech recognition, the contribution of the fundamental frequency information and periodic information of sound waves in the process of speech generation is weak, but for Chinese tone recognition, the fundamental frequency information and periodic information are especially important.

[0003] The recognition of Chinese tones is mainly realized by perceiving changes in the fundamental frequency (F0) in the frequency domain. Some other acoustic characteristics will also be different in different tones, and these acoustic characteristics may also be helpful for the recognition of tones. For example, final length: Generally speaking, the final length of the third tone is the longest, while the fourth tone is the short...

Images