A Speech Processing Method Applied to Cochlear Electronics

Abstract

The invention provides a voice processing method applied in an electronic ear. The method comprises the steps of carrying out pre-emphasis treatment on an input voice signal by promoting high frequency components, then dividing the voice signal into m frequency bands through a filter group consisting of m band-pass filters, obtaining envelope signals of m channels by full-wave rectification and low-pass filtration, calculating the modulation depth of each channel, selecting n channels with greatest modulation depth, carrying out non-linear function compression on envelopes of the n channels for obtaining a relatively narrow dynamic range, using a symmetric dual-phase pulse sequence for carrying out modulation on envelope amplitude information after the compression of the n channels, modulating the asynchronization of the pulse sequence on time sequence, appearing alternating pulses and eliminating interferences among the channels. The stimulation rate of each channel obtained by usingthe n channels for stimulating an electrode is larger than the simulation rate of each channel when using m channels for simulating the electrode under the condition of constant total stimulation rate, thereby transferring more time domain details of the voice signal and improving the accuracy of voice recognition.

Description

technical field [0001] The invention relates to a speech signal processing method, in particular to a speech processing method applied to an electronic cochlear extracorporeal speech processor. Background technique [0002] Cochlear implant is the only device that can help severely deaf patients to restore partial hearing by directly stimulating the residual auditory nerve through electrical signals. figure 1 It is a block diagram of the signal processing flow chart of the cochlear electronic system, such as figure 1 As shown, the voice signal collected by the microphone is pre-emphasized and the digital signal converted by the ADC is divided into m channels through the filter bank or FFT. The envelope amplitude information of the sound signal of each channel is transformed into dynamic by nonlinear compression. Electrical signals with a small range, coded electrical signals are transmitted through radio frequency to stimulate some electrodes of the implant. The speech pro...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new voice processing method applied to cochlear electronics, which can solve the problem of increasing the stimulation rate of each stimulating electrode when the total stimulation rate is constant within one stimulation cycle, so as to achieve a higher transmission rate. Multi-speech detail information to improve the accuracy of speech recognition for cochlear users

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