Filter design method and device of active noise reduction earphone and test equipment

A filter design, active noise reduction technology, applied in earphone/headphone accessories, headphones to reduce environmental noise, instruments, etc., can solve the problem of large differences in noise reduction effect of feedforward filter noise reduction effect, etc.

Active Publication Date: 2020-10-20
SHENZHEN HORN AUDIO
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Problems solved by technology

[0004] In view of this, the embodiment of the present application provides a filter design method, device and test equipment for active noise reduction earphones, so as to solve the problem of mixed The effect of noise reduction is not the linear superposition of the noise reduction effect of the feedforward filter and the noise reduction effect of the feedback filter, and the noise reduction effect in some frequency bands is quite different from the expected problem

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  • Filter design method and device of active noise reduction earphone and test equipment
  • Filter design method and device of active noise reduction earphone and test equipment
  • Filter design method and device of active noise reduction earphone and test equipment

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[0029] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0030] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude one or more other Presence or addition of features, wholes, steps, operations, elements, components and / or collections thereof.

[0031] In additi...

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Abstract

The invention is suitable for the technical field of noise reduction earphones, and provides a filter design method and device for an active noise reduction earphone, and test equipment. According tothe invention, a feedback filter is designed in advance; according to the frequency response curve of the feedback filter, a transfer function from the external noise to the standard microphone in theear canal, a transfer function from the loudspeaker to a standard microphone in the ear canal, a transfer function from the external noise to a feed-forward microphone, a transfer function from the external noise to the feedback microphone and the transfer function from the loudspeaker to the feedback microphone, the frequency response curve of the feedback filter is calculated; the influence onthe ideal frequency response curve of the feed-forward filter is analyzed when the feedback filter is opened for noise reduction, and the ideal frequency response curve of the feed-forward filter is corrected, so as to design the feed-forward filter with the mixed noise reduction effect meeting the expectation according to the corrected ideal frequency response curve of the feed-forward filter.

Description

technical field [0001] The present application belongs to the technical field of noise-cancelling headphones (Noise-Cancellation Headphone), and in particular relates to a filter design method, device and testing equipment for active noise-cancelling headphones. Background technique [0002] Noise-canceling headphones refer to headphones that can reduce noise in the external environment. Noise canceling headphones include active noise canceling headphones and passive noise canceling headphones. Active noise reduction is to offset the noise in the external environment by generating sound waves with the same amplitude and opposite phase as the noise in the external environment through the speaker, and it has a significant effect on reducing the noise in the middle and low frequency bands. Passive noise reduction is to block the noise in the external environment through sound insulation components such as earmuffs and earplugs. Generally, it only works on high-frequency noise ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/10H04R29/00G10K11/175
CPCH04R1/10H04R1/1083G10K11/175H04R29/00
Inventor 刘涛朱彪王丽
Owner SHENZHEN HORN AUDIO
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