Artificial cochlea implementation method using the ATF coding technology and ATF artificial cochlea

An ATF coding and cochlear implant technology, applied in medical science, speech analysis, instruments, etc., can solve the problem of not being able to reflect time difference, unable to express the time coding, transmission and processing characteristics of auditory center, and unable to express different timing of multiple neurons. Sex and other issues, to reduce mutual interference and improve sound quality

Inactive Publication Date: 2011-06-29
SOUTHERN MEDICAL UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] However, all currently known speech coding methods only consider the conversion process of speech signals to electrical signals, which is equivalent to the linear conversion of mechanical waves to receptor potentials, and do not have synaptic characteristics and timing from the formation of inner hair cells and auditory nerve fibers. Physiological factors such as conversion function
Therefore, the existing cochlear implants cannot show the different timing of multiple neurons responding to the same sound intensity, nor can they reflect the different timing of the same neuron responding to different sound intensities (sound intensity responds early), and it is impossible to represent the auditory center. The temporal encoding, transmission and processing properties of , and the physiological properties of front-back masking (a strong sound that appears later in the time course masks an earlier weak sound)
Therefore, the existing cochlear implants cannot achieve very ideal results

Method used

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  • Artificial cochlea implementation method using the ATF coding technology and ATF artificial cochlea
  • Artificial cochlea implementation method using the ATF coding technology and ATF artificial cochlea
  • Artificial cochlea implementation method using the ATF coding technology and ATF artificial cochlea

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Embodiment 1

[0045] Please refer to Fig. 1, the present invention provides a kind of cochlear implant implementation method that adopts ATF coding technology that makes cochlear implant more tend towards human ear function, and this method comprises the following steps:

[0046] (1) Sound amplitude signal extraction

[0047] The sound signal is first filtered through acoustic-electric conversion (or / and Fourier transform), rectified and low-pass filtered to extract the amplitude envelope wave and compress it, and then perform continuous interval sampling on the amplitude envelope wave and extract the instantaneous amplitude (I) (optional Therefore, when the sampling rate is high, the envelope wave extraction may not be performed). This step can be carried out using existing methods in the prior art.

[0048] (2) Conversion of stimulus onset time (T)

[0049] The instantaneous amplitude signal extracted in step (1) is converted according to the following formula (1),

[0050] T 0 =αe -...

Embodiment 2

[0071] Please refer to Figure 9, the present invention provides an ATF cochlear implant, which mainly includes:

[0072] 1. Sound signal input module:

[0073] This part mainly includes a microphone and an automatic gain amplifier for sound-electric conversion and amplification. Its working steps are as follows:

[0074] (1) Sound signal input

[0075] The broadband sound signal is firstly converted by the microphone and then amplified by the automatic gain amplifier (Figure 10).

[0076] 2. Sound signal processing module (device):

[0077] This part mainly includes a band-pass filter, a rectifier, a low-pass filter, a compression module, and a voice coding module. stimulus signal. Its working steps are as follows:

[0078] (2) Filter frequency division

[0079] Several (usually select 1~24, such as 5, 10, 20 etc., select 4 in this embodiment) narrow-band filter (total bandwidth does not exceed 20-20kHz, such as 50Hz, 100Hz, 500Hz, 2kHz, 5kHz, 15kHz, etc., select 10-30...

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Abstract

The invention discloses an artificial cochlea realizing method using an ATF coding technic and an ATF artificial cochlea, the method comprises: acquiring and pre-processing an audio signal, thereafter frequency-division converting the audio signal into at least two uniconductive narrowband audio signals; sampling the processed uniconductive narrowband audio signals to extract several instantaneous amplitudes; performing STF coding technic processing on each instantaneous amplitude and converting an instantaneous audio intensity into a group of multi-pulses which have amplitudes from small to big, different starting time, different frequencies in a period of time, then integrating the several multi-pulses to an excited pulse for exciting the cochlea. The ATF coding technic of the inventionhas its spring in a time physiological characteristic of central nerve cell reaction in hearing of an organism, so that the audio coding is more suitable for a human hearing physiological characteristic, and is capable of fully improving the performance of the artificial cochlea.

Description

technical field [0001] The present invention relates to a cochlear implant, in particular to a method for improving the cochlear implant by utilizing pulse amplitude-time-frequency (ATF) encoding technology and its corresponding products. Background technique [0002] In medicine, patients with a hearing threshold above 90 decibels are collectively referred to as total deafness. The cause of total deafness in most patients is the damage of hair cells rather than the functional decline of the auditory nerve. Therefore, there is still the possibility of stimulating the auditory center by electrical stimulation, that is, the hearing can be restored by electrical stimulation. The cochlear implant is a medical electronic product for the treatment of sensory deafness based on this premise. A cochlear implant is an imitation of the characteristics of the cochlea. According to the principle of cochlear coding of speech, several electrodes are implanted in different positions in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/18G10L19/00G10L19/012
Inventor 肖中举谭晓东周凌宏陈伟兵邓亲恺郭梦和
Owner SOUTHERN MEDICAL UNIVERSITY
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