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Design method and design device of feedback filter and earphone

A design method and feedforward filter technology, applied in the direction of sensors, electrical components, etc., can solve the problems of poor robustness, damage to the user's hearing, and inability to eliminate noise, so as to achieve the effect of enhancing robustness and reducing howling

Active Publication Date: 2019-11-08
HUITING ACOUSTICS TECH BEIJING CO LTD
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Problems solved by technology

[0003] However, the feedback filter is designed based on the acoustic characteristics of a certain sample noise-cancelling earphone, and the noise-cancelling earphone is in a statically stable state. When the above-mentioned feedback filter is used for mass production and application of the noise-cancelling earphone, due to the As a result, the consistency of the acoustic characteristics of the noise-cancelling headphones is poor, and the acoustic characteristics of the noise-cancelling headphones change sharply due to operations such as squeezing during use. At this time, the noise-cancelling system using the same feedback filter is prone to unstable problems, and then cause howling. At this time, not only the noise cannot be eliminated, but also the noise will be enhanced, which will damage the user's hearing, and the robustness is poor.

Method used

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  • Design method and design device of feedback filter and earphone
  • Design method and design device of feedback filter and earphone
  • Design method and design device of feedback filter and earphone

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Embodiment Construction

[0058]In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, every other embodiment obtained by those skilled in the art without...

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Abstract

The invention provides a design method and a design device of a feedback filter and an earphone. The design method comprises the following steps: acquiring a transfer function of a secondary channel of the earphone in at least one working state; determining a nominal system transfer function and a first weight function of the earphone based on the transfer function of the secondary channel; determining a second weight function based on the noise reduction expectation of the earphone; and determining parameters of the feedback filter based on the first weight function, the second weight function and the nominal system transfer function. Compared with a design method of a feedback filter in the prior art, the parameters of the feedback filter are determined through the transfer functions ofthe secondary channels in the multiple working states, so that the earphone is kept stable in the multiple working states, howling is reduced, and robustness is enhanced under the condition that noiseis kept low.

Description

technical field [0001] The present application relates to the technical field of active noise reduction, in particular to a design method, a design device and earphones of a feedback filter. Background technique [0002] The noise reduction effect of active noise reduction headphones mainly depends on the design of the filter in the noise reduction system. According to the topology of each device in the noise reduction system, the filter is divided into a feedforward filter and a feedback filter. The feedback filter has a good noise reduction effect on low frequency noise. [0003] However, the feedback filter is designed based on the acoustic characteristics of a certain sample noise-cancelling earphone, and the noise-cancelling earphone is in a statically stable state. When the above-mentioned feedback filter is used for mass production and application of the noise-cancelling earphone, due to the As a result, the consistency of the acoustic characteristics of the noise-ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00H04R31/00
CPCH04R29/00H04R31/00
Inventor 虞安波颜学海
Owner HUITING ACOUSTICS TECH BEIJING CO LTD
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