Voice processing method applied in electronic ear
A technology of speech processing and cochlear implants, which is applied in speech analysis, speech recognition, ear therapy, etc., to achieve the effect of improving accuracy
Inactive Publication Date: 2010-02-10
INST OF ACOUSTICS CHINESE ACAD OF SCI
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[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 w
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[0037] like image 3 As shown, after the input speech signal is pre-emphasized to increase the high-frequency components, the speech signal is divided into m frequency bands through a filter bank composed of m band-pass filters, and obtained by full-wave rectification and low-pass filtering. For the envelope signal of m channels, calculate the modulation depth (modulation depth) of each channel, that is, the maximum value A of the envelope max and minimum A min ratio, select the n (n
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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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IPC IPC(8): G10L15/00G10L21/00G10L19/00A61F11/04A61F2/18
Inventor 孟丽肖灵崔杰
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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