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Low-complexity adjustable filter group used for digital hearing aid and working method of Low-complexity adjustable filter group

A low-complexity, filter bank technology, applied in hearing aids, electrical components, etc., can solve problems such as insufficient efficient and effective design, time extension, and low complexity of filter banks

Active Publication Date: 2015-04-01
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 adjustable filter group used for digital hearing aid and working method of Low-complexity adjustable filter group
  • Low-complexity adjustable filter group used for digital hearing aid and working method of Low-complexity adjustable filter group
  • Low-complexity adjustable filter group used for digital hearing aid and working method of Low-complexity adjustable filter group

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0211] Example 1. Mild hearing loss at high frequencies

[0212] Patients with this type of hearing loss cannot hear r s's, z's, th's, v's, and other high-frequency unvoiced consonants. Fig. 7 (a) has provided the hearing acuity diagram, and the present invention compensates the right ear hearing threshold value (represented by 'O') accordingly. The slope of the threshold curve is larger in the middle frequency range region, so the present invention places more subbands in this region. Wider subbands can be used in the low frequency region due to better hearing 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. The magnitude response of this filter bank is given in Fig. 7(b).

example 2

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

[0214]The hearing-impaired patient with the audiogram of Figure 8(a) can understand conversations at a distance of 1 to 2 meters, which is significantly smaller than that of a person with normal hearing (a person with normal hearing can understand the conversation at a distance of up to 12 meters). The hearing threshold curve has higher fluctuations in the low frequency region than in the middle and high frequency regions. So 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, respectively. Figure 8(b) shows the magnitude response of this filter bank.

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

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Abstract

The invention discloses a low-complexity adjustable filter group used for a digital hearing aid and a working method of the low-complexity adjustable filter group. The low-complexity adjustable filter group used for the digital hearing aid comprises a masking module and a multi-band-pass generation module which are connected in sequence, wherein the masking module is used for dividing the received sound signals into a low-frequency area, an intermediate-frequency area and a high-frequency area according to frequencies; the multi-band-pass generation module is used for giving three different sub-band decomposition states to each area of the low-frequency area, the intermediate-frequency area and the high-frequency area, and then outputting sub-band signals, wherein the three different sub-band decomposition states of each of the low-frequency area, the intermediate-frequency area and the high-frequency area are as follows: in the first state, each area is decomposed into a sub-band of which the bandwidth is pi / 3, in the second state, each area is evenly decomposed into two sub-bands of which the bandwidths are pi / 6, and in the third state, each area is evenly decomposed into four sub-bands of which the bandwidths are pi / 12. The low-complexity adjustable filter group has the advantages of low complexity and small delay, the dividing state of a frequency band can be changed under the condition that the structure of the filter group is not changed under by controlling parameters, so a target of sound decomposition according to the hearing loss characteristics of a patient is realized.

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 varying degrees of hearing loss, making hearing impairment one of the most common sensory impairments in the world. The most effective way to compensate for hearing loss is with a hearing aid system. The hearing aid system is a complex 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]Aage R.Moller,Hearing:Anatomy,Physiology and Disorders of the Auditory System,Academic Press,2nd edition,September 11, 2006.]. In digital hearing aids, the analog sound signal is converted int...

Claims

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Application Information

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IPC IPC(8): H04R25/00
CPCH04R25/00
Inventor 魏莹贾琪田岚
Owner SHANDONG UNIV