Artificial cochlea manufacture method suitable for Chinese voice coding strategy

Abstract

The present invention proposes a method for manufacturing a cochlear implant suitable for the Chinese speech coding strategy, including the following parts: pre-emphasis, the high-frequency components in the speech signal are lifted by a first-order FIR high-pass filter; Ear auditory characteristics Divide the speech frequency band into equal bark scales and divide it into several sub-bands, and filter the signal with zero phase distortion based on the frequency domain filtering technology of Fourier transform to obtain the signal of each sub-band; quasi-phase-locked stimulus delivery, including Zero-crossing detection, envelope extraction, nonlinear dynamic range compression, and electric pulse distribution; zero-crossing detection detects the positive zero-crossing point of each frequency band signal as the zero-phase moment of the frequency band; envelope extraction, extracts the packet of each sub-band signal Envelope, such as using Hilbert transform to obtain; nonlinear dynamic range compression performs nonlinear compression on the dynamic range of envelope values; and electric pulse emission.

Description

Technical field [0001] The invention belongs to the technical field of speech signal processing, and relates to a cochlear implant, in particular to a method for manufacturing a cochlear implant suitable for a Chinese speech coding strategy. Background technique [0002] In the information society, communication between people has become more and more important, but deaf people who have lost hearing cannot use voice as a convenient and effective tool for normal interpersonal communication, let alone enjoy life such as listening to music. pleasure. Helping deaf people return to the world of sound and enabling them to live a normal life is a work of important social significance. For this goal, predecessors have carried out a lot of research work and explored some feasible methods and technologies. Cochlear implant technology is a better method. [0003] The basic principle of cochlear implants is to use an external speech processor instead of the cochlea to perform frequency analy...

AI Technical Summary

Problems solved by technology

[0012] The use of cochlear implants can help deaf patients recover a certain degree of speech recognition ability, but the same type of cochlear implants imported from China, the effect is not as good as the foreign situation, showing that the correct rate of speech recognition is very low, and the speech intelligibility is reduced

The study found that foreign cochlear implant speech processing methods are all aimed at Western languages, represented by English; while our language is Chinese, which is different from Western languages. There are obvious differences between Mandarin Chinese and English in terms of acoustics and phonetics. Different, the most notable feature is that the change of the fundamental frequency of the vowel in Mandarin Chinese has a denotative effect, but the current cochlear implant technology cannot reflect the change of the fundamental frequency of speech

Although the cochlear implant technology used abroad has a better effect when speaking English, it also encounters great difficulties in listening to music and learning music

These cases all show that with current cochlear implant technology, the correct perception of the fundamental frequency is difficult

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