Artificial cochlea speech processing method based on frequency modulation information and artificial cochlea speech processor

Abstract

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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Problems solved by technology

[0004] Although in the current speech processing strategy, only relying on the time-domain envelope information of 3-4 frequency bands, deaf patients can obtain more than 90% speech intelligibility in a quiet environment, but it does not work in a noisy environment. Can't get good results

Moreover, for patients whose mother tongue is Chinese, their speech intelligibility is obviously not as good as the former, especially in the aspect of tone recognition, the tone recognition rate of the Chinese four tones of deaf patients wearing cochlear implants is very low

This is because, unlike Western languages, Mandarin Chinese and English are significantly different in terms of acoustics and phonetics. The most notable feature is that the tones in Mandarin Chinese have expressive functions, but the current cochlear implant technology cannot reflect the tones of speech Variety

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