Artificial cochlea speech processing method based on frequency modulation information and artificial cochlea speech processor
A speech processor and frequency modulation technology, applied in speech analysis, instruments, ear treatment, etc., can solve the problems of low recognition rate of Chinese four-tone tones, inability to reflect the change of speech tones, and inability to achieve effects, and achieve enhanced speech recognition. effect of ability
A speech processor and frequency modulation technology, applied in speech analysis, instruments, ear treatment, etc., can solve the problems of low recognition rate of Chinese four-tone tones, inability to reflect the change of speech tones, and inability to achieve effects, and achieve enhanced speech recognition. effect of ability
CN101642399AActive Publication Date: 2010-02-10INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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[0034] The speech processing method and processor based on frequency modulation information of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] refer to figure 1 , is an embodiment of a four-channel continuous overlapping sampling algorithm of the present invention, and the specific flow of speech signal processing is as follows.
[0036] 1) After the speech signal is pre-emphasized, it is decomposed into several sub-bands through a set of analysis filter banks;
[0037] In the existing cochlear implant speech processors, the number of sub-bands usually selected ranges from 4 to 22, which vary according to individual differences of deaf patients during the specific fitting process.
[0038] The frequency modulation information-based speech processing method of the present invention and the analysis filter bank adopted by the processor are four 6-order Butterworth band-pass filters. In order...
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The invention provides an artificial cochlea speech processing method based on frequency modulation information and an artificial cochlea speech processor. The artificial cochlea speech processing method comprises the following steps: pre-emphasizing a speech signal; decomposing the speech signal by an analysis filter into a plurality of sub frequency bands; then, extracting the time-domain envelope information of each sub frequency band signal; adopting a Hilbert transform method to extract the frequency modulation information of a low-frequency part to multiple by time-domain envelopes so asto acquire a synthetic time-domain envelope containing the frequency modulation information; utilizing various acquired time-domain envelopes of the sub frequency bands to modulate a pulse sequence by a pulse generator; adding modulated pulses of various sub frequency bands to acquire a finally synthesized stimulus signal; and sending the stimulus signal to an electrode to generate an electric pulse to stimulate the auditory nerve. The artificial cochlea speech processor is suitable for deafness patients speaking Chinese as a native language to recognize speeches in a noise environment and has noise robustness, thereby enabling the deafness patients to feel more fine speech structure information, enhancing the speech recognition abilities of the deafness patients in the noise environmentand benefiting the tone recognition.
Description
technical field [0001] The present invention relates to a cochlear implant speech processing method and processor, in particular to a frequency modulation-based speech recognition method suitable for deaf patients whose mother tongue is Chinese in a noisy environment by using frequency modulation information in speech signals. Cochlear implant speech processing method and processor for information. Background technique [0002] Cochlear implants are currently the only effective way to restore partial hearing to totally deaf patients. It implants an electrode array in the patient's cochlea, generates electrode stimulation signals according to the input acoustic signal, and restores partial hearing to patients with deep deafness by stimulating the auditory nerve with electrical signals. It simulates and replaces the overall hearing from the outer ear to the inner ear. The role of the function. The speech signal processor is the most important part of the cochlear implant. It...
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Patent Timeline
10 Feb 2010
Publication
CN101642399A
- IPC
- A61F11/04; G10L21/02
- Inventors
- 杨琳; 张建平