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Reorganizable filter bank of digital hearing aid based on nonlinear transformation and design method

A nonlinear transformation and reconstruction filter technology, applied in digital technology networks, electrical components, impedance networks, etc., can solve problems such as large delay of reconfigurable filter groups and inability to meet the real-time requirements of hearing aids

Active Publication Date: 2015-06-24
SHANDONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the group delay of the reconfigurable filter bank is too large to meet the real-time requirements of hearing aids

Method used

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  • Reorganizable filter bank of digital hearing aid based on nonlinear transformation and design method
  • Reorganizable filter bank of digital hearing aid based on nonlinear transformation and design method
  • Reorganizable filter bank of digital hearing aid based on nonlinear transformation and design method

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Embodiment Construction

[0084] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0085] I. Before discussing the structure of the proposed filter bank, the design of the cosine modulated filter bank and the principle of nonlinear transformation are firstly explained.

[0086] A. Cosine Modulated Uniform Filter Bank

[0087] cosine modulated filter bank h (i) (n)(i=0,...,M) is shown by formula (1), where h L (n) is a low-pass prototype FIR filter with a length of L, M is a modulation factor, and i is a subband index number. c i is the amplitude control factor, when i=0,M, c i is 1; when when c i is 2; h (i) The z-transform transfer function of (n) is shown in formula (2).

[0088] h ( i ) ( n ) = c i · h L ...

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Abstract

The invention discloses a reorganizable filter bank of a digital hearing aid based on nonlinear transformation and a design method. The reorganizable filter bank comprises a shielding module and a passband forming module which are connected in sequence, wherein the shielding module is used for extracting a low-frequency passband and a high-frequency passband of a mapping frequency space, the passband forming module is used for transforming a low-pass FIR filter into an even filter bank through disperse cosine modulation and mapping the even filter bank into an uneven filter bank through a nonlinear transformation, and the passband forming module can generate four different subband distribution schemes through changing of values of set parameters. The reorganizable filter bank and the design method have the advantages that the four different subband distribution schemes can be provided under the situation that the basic structure is not changed by adjusting control parameters based on the combination of the cosine modulation filter bank and the nonlinear transformation, and thus amplification compensation is flexibly conducted on voices. Compared with a previous design method, the design method has good compatibility and low group delay.

Description

technical field [0001] The invention belongs to the technical field of reconfigurable filter banks, and in particular relates to a nonlinear transform-based reconfigurable filter bank for digital hearing aids and a design method. Background technique [0002] The main goal of hearing aids is to provide hearing compensation for hearing-impaired patients, which includes two important contents: one is to choose an appropriate decomposition method to decompose the entire speech into different frequency channels, which can be achieved through filter banks; The other is to selectively amplify the decomposed sub-signals according to the characteristics of hearing loss. [0003] Currently, filter banks can generally be divided into two categories: uniform filter banks and non-uniform filter banks. Due to the non-uniform nature of human ear filtering, a uniform filter bank cannot provide a satisfactory sound compensation scheme for hearing-impaired patients. Therefore, many scholar...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 魏莹黄绍广田岚
Owner SHANDONG UNIV
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