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Low-complexity tunable filter bank for digital hearing aids and method of operation

A low-complexity, filter-bank technology, applied in hearing aids, electrical components, etc., can solve problems such as time extension, low-complexity filter banks, and inability to be practically applied

Active Publication Date: 2016-01-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This filter bank has low complexity, however its latency is too long to be practical
Although tunable filter banks meet new trends in digital hearing aids, research on efficient and effective designs is far from enough

Method used

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  • Low-complexity tunable filter bank for digital hearing aids and method of operation
  • Low-complexity tunable filter bank for digital hearing aids and method of operation
  • Low-complexity tunable filter bank for digital hearing aids and method of operation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0211] Example 1. High-frequency mild hearing loss

[0212] Patients with this type of hearing loss cannot hear rs's, z's, th's, v's, and other high-frequency unvoiced consonants. Fig. 7(a) shows the hearing sensitivity graph, according to which the present invention compensates the right ear hearing threshold (denoted by'O'). In the middle frequency range region, the slope of the threshold curve is larger, so the present invention places more subbands in this region. Since hearing is better in the low frequency region, a wider subband can be used in the low frequency region. The decomposition plans of areas 1, 2, and 3 are decomposition state 1, decomposition state 3 and decomposition state 2, respectively. A total of 7 subbands are generated. Figure 7(b) shows the amplitude response of the filter bank.

example 2

[0213] Example 2. Mild hearing loss in all frequency bands

[0214] The hearing loss patient with the audiometric acuity chart of Figure 8(a) can understand the conversation within 1 to 2 meters. This conversation distance is significantly smaller than that of a normal hearing person (the distance at which a normal hearing person can understand the conversation Up to 12 meters). The hearing threshold curve has higher fluctuations in the low frequency region than in the middle and high frequency regions. Therefore, consider placing more subbands at low frequencies. The decomposition plans for areas 1, 2, and 3 are decomposition state 3, decomposition state 2, and decomposition state 1. Figure 8(b) shows the amplitude response of the filter bank.

[0215] The filter bank is generated by an F(z) with a length of 81 and an H(z) with a length of 69. Since they are both linear phase filters, 76 different coefficients are needed to generate 21 different subbands. Table 2 shows the co...

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Abstract

A low-complexity adjustable filter bank for a digital hearing aid and an operating method therefor. The filter bank comprises a masking module and a multi-band generation module which are connected in sequence, wherein the masking module is used for dividing received voice signals into three regions, i.e. a low frequency region, a medium frequency region and a high frequency region in accordance with frequencies, and the multi-band generation module is used for giving three different subband decomposition states to each of the three regions, i.e. the low frequency region, the medium frequency region and the high frequency region, and then outputting subband signals. The three different subband decomposition states comprise: state 1: decomposing each region into subbands of which the bandwidth is π / 3; state 2: uniformly decomposing each region into two subbands of which the bandwidth is π / 6; and state 3: uniformly decomposing each region into four subbands of which the bandwidth is π / 12. The method is low in complexity and small in delay, so that the division states of frequency bands can be changed by controlling parameters in the case where the structure of the filter bank is not changed, thereby achieving the goal of performing voice decomposition according to hearing loss characteristics of a patient.

Description

Technical field [0001] The invention relates to a low-complexity adjustable filter bank for digital hearing aids and a working method thereof. Background technique [0002] The auditory system is a very sensitive and complex network. Disease, drugs, noise, trauma, and aging can all cause different degrees of hearing loss, which makes hearing impairment one of the most common sensory impairments in the world. The most effective way to compensate for hearing loss is to use a hearing aid system. The hearing aid system is a synthesis of technologies such as speech amplification, noise reduction, feedback suppression, automatic program switching and environmental adaptation. The basic function of a hearing aid is to selectively amplify the sound, and then transmit the processed signal to the ear [[1] AageR.Moller, Hearing: Anatomy, Physiology and Disordersofthe Auditory System, Academic Press, 2nd edition, September 11, 2006.]. In digital hearing aids, the analog sound signal is co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R25/00
CPCH04R25/00
Inventor 魏莹贾琪田岚
Owner SHANDONG UNIV