Electrical auditory prosthesis single processing method and system

A signal processing and electroacoustic technology, applied in the field of medical devices, can solve problems such as discarding frequency components, too fast, and the impact of sound perception

Active Publication Date: 2015-08-26
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The HSSE strategy has a certain effect on the pitch perception of sounds with harmonic components, but pitch perception is only a part of sound perception. Explicitly extracting and utilizing harmonic and fundamental frequency components may improve pitch perception. Also negatively affects sound perception in other areas
[0004] In addition, there are obvious technical defects in this technology: 1. In SSE, the information close to the carrier frequency is moved to a very low frequency area, such as 0-50Hz
According to p

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  • Electrical auditory prosthesis single processing method and system
  • Electrical auditory prosthesis single processing method and system
  • Electrical auditory prosthesis single processing method and system

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Experimental program
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Effect test

Embodiment 1

[0077] Embodiment 1: A processor with 16 electrode channels processes a single Chinese character "下" / xià / , and adopts the signal processing method of the present invention respectively (i.e., the method 1 used in pre-designing the band-pass filter bank and the method used to extract slowly changing information Method 1), the experimental results are as follows Figure 7 As shown in the left electrode diagram, only part of the time period is shown in the diagram; and the time domain envelope method adopted by modern clinical strategies, the experimental results are as follows Figure 7 As shown in the right electrode diagram, only part of the time period is shown in the diagram; in the left diagram, it can be clearly observed that the fluctuation speed of the time domain envelope is slowing down (for example, T2>T1), but this rule is not reflected in the right diagram. This slowing down corresponds to the tone of the character "Xia", which is the fourth tone (Qu tone). At the ...

Embodiment 2

[0079] Embodiment 2: The method of simulated sound is used to carry out a psychoacoustic comparative experiment of pure tone frequency resolution on the present invention, clinical CIS strategy, and normal hearing (NH). The subjects are 3 young people with normal hearing. Under the conditions of a reference frequency (650, 750, 850, 1950, 2050, 2150Hz), the minimum resolvable frequency Δf corresponding to the three methods was respectively measured, and the ordinate in the figure is represented by the Weber fraction (Δf / f). The test results like Figure 8 shown. It can be found that the present invention is superior to the clinical CIS strategy in most cases (the smaller the Weber score, the better the effect), and is equivalent to CIS in a few cases. And the present invention is comparable to, and in some cases superior to, NH. This shows that the present invention can improve the frequency resolution capability.

[0080] The method that adopts vocoder simulation sound to ...

Embodiment 3

[0081] Embodiment three: on the one hand compare the TLE (Temporal Limits Encoder of the present invention, real-time domain restriction coding) strategy and CIS (Continuous Interleaved Sampling, i.e. the performance of continuous interval sampling) strategy in Mandarin tone recognition, as Figure 9 Shown; On the other hand compare the performance of the speech recognition of the present invention (TLE strategy) and CIS strategy in the noise, as Figure 10 As shown; where u and G are two frequency division methods, u means that 50 to 3250 Hz is evenly divided, and G means that 80 to 8000 Hz is divided by equal basement membrane length according to the Greenwood function. It can be seen from the figure that the present invention (TLE strategy) can provide a lower speech acceptance threshold in noise and a higher tone recognition rate than the CIS strategy. This shows the advantage of the present invention (TLE strategy) in speech perception.

[0082] In summary, the present i...

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Abstract

The invention provides an electrical auditory prosthesis signal processing method, and belongs to the field of medical instruments. The method comprises the following steps: firstly utilizing a band-pass filter group to carry out filtering on a collected sound signal; extracting a slow-varying signal u<k>(t) after signals x<k>(t) output by all band-pass filters are subjected to the downward frequency shift to a low-frequency range, wherein in the downward frequency shift processing procedure, the movable frequency of the x<k>(t) is equal to lower cut-off frequency fcl<k> of a kth band-pass filter minus the lowest frequency fl<k> of a kth electrode channel within a time-domain pitch processing range; finally, processing the extracted slow-varying signal u<k>(t), and modulating the processed slow-varying signal on a carrier wave to be transmitted out. According the method, frequency allocation of the band-pass filters is realized through the time-domain processing capability in a single electrode channel of an implant user, the slow-varying signal is extracted according to the time-domain processing capability of the single electrode channel, and the extracted slow-varying signal can be transmitted to auditory nerves near to corresponding electrodes, so that the overall sound perception of the implant user can be improved.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a signal processing method and system of an electric auditory prosthesis. Background technique [0002] Some people's auditory nerve pathways are interrupted due to various reasons such as lesions and genetics. Implantation of electrical auditory prostheses can help them restore part of their hearing, such as cochlear implants (Cochlear Implants, CI), auditory brainstem implants (Auditory Brainstem Implants, ABI) and so on. Modern electroacoustic prosthetic devices typically consist of an electrode array consisting of multiple electrode contacts. The currently clinically used electroauditory prosthesis signal processing method is continuous interval sampling (Continuous Interleaved Sampling, CIS). The CIS processing flow in the modern CI processor is as follows: first, a band-pass filter bank is used to band-pass filter the time-domain signal collected by the microp...

Claims

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Application Information

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IPC IPC(8): A61F2/18A61F11/04
Inventor 孟庆林郑能恒李霞
Owner SHENZHEN UNIV
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