Howling Removal Based on Analytical Design of All-phase Notch Filter

Xiangdong HUANG; Yue GAO

doi:10.11999/JEIT200623

Volume 43 Issue 10

Oct. 2021

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Article Navigation > Journal of Electronics & Information Technology > 2021 > 43(10): 3043-3049

Xiangdong HUANG, Yue GAO. Howling Removal Based on Analytical Design of All-phase Notch Filter[J]. Journal of Electronics & Information Technology, 2021, 43(10): 3043-3049. doi: 10.11999/JEIT200623

Citation:

Xiangdong HUANG, Yue GAO. Howling Removal Based on Analytical Design of All-phase Notch Filter[J]. Journal of Electronics & Information Technology, 2021, 43(10): 3043-3049. doi: 10.11999/JEIT200623

Xiangdong HUANG, Yue GAO. Howling Removal Based on Analytical Design of All-phase Notch Filter[J]. Journal of Electronics & Information Technology, 2021, 43(10): 3043-3049. doi: 10.11999/JEIT200623

Citation:

Xiangdong HUANG, Yue GAO. Howling Removal Based on Analytical Design of All-phase Notch Filter[J]. Journal of Electronics & Information Technology, 2021, 43(10): 3043-3049. doi: 10.11999/JEIT200623

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Howling Removal Based on Analytical Design of All-phase Notch Filter

doi: 10.11999/JEIT200623

Xiangdong HUANG^,,
Yue GAO

School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

Funds: The National Natural Science Foundation of China (61671012)

Received Date: 2020-07-27
Rev Recd Date: 2020-12-15

Available Online: 2021-01-05

Publish Date: 2021-10-18

Abstract

Abstract

In order to quickly and accurately suppress the howling effect in hearing aids, this paper presents an analytical design of all-phase Finite Impulse Response(FIR) notch filter with explicit controllable center frequency. Firstly, to obtain the higher accuracy, integer m and decimal λ are introduced to control the central frequency of the notch filter. Then, an even symmetric closed-form analytic formula is designed to complete the design of the notch filter, which shows that the proposed notch filter has linear transmission characteristics and avoids nonlinear distortion. Finally, data extension and interception are carried out to ensure the continuity and linear phase of the output signal. Herein, the proposed notch filter is inserted into hearing aid to suppress the howling for the sake of verifying its performances. The experimental results show that the attenuation value of the proposed filter at the howling frequency can reach –330 dB, and the SNR is 22 dB. Moreover, the proposed filter is of good output waveform quality, low algorithm complexity and high robustness, and it has a certain application prospect.
- Closed-form Finite Impulse Response (FIR) notch,
- Controllable central frequency,
- Linear-phase

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References(18)

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