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Feed-forward filter design method and noise reduction earphone

A feedforward filter and design method technology, applied in earphone/earphone accessories, earphones to reduce environmental noise, sensors, etc., can solve the problems of low design efficiency, long calculation time, large amount of calculation of feedforward filter, etc., to save The effect of calculating time, reducing the amount of calculation, and improving design efficiency

Active Publication Date: 2019-01-11
HUITING ACOUSTICS TECH BEIJING CO LTD
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  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention proposes a feedforward filter design method and noise reduction earphones, which are used to solve the problems of large amount of calculation, long calculation time and low design efficiency in the design process of the feedforward filter existing in the prior art question

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  • Feed-forward filter design method and noise reduction earphone
  • Feed-forward filter design method and noise reduction earphone
  • Feed-forward filter design method and noise reduction earphone

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Embodiment 1

[0042] Such as figure 1 It shows the flow chart of the steps of the feedforward filter design method provided by the embodiment of the present invention, refer to figure 1 , the feedforward filter design method includes the following steps:

[0043] Step S10: For the sound transmission characteristic amplitude and phase-frequency curve of the main channel and the sound transmission characteristic amplitude and phase-frequency curve of the secondary channel, determine the complex representation of the sound transmission characteristic of the main channel and the complex representation of the sound transmission characteristic of the secondary channel;

[0044] Step S20: Determine the amplitude-frequency curve of the ideal feedforward filter according to the complex representation of the sound transmission characteristics of the main channel and the complex representation of the secondary channel sound transmission characteristics;

[0045] Step S30: Determine the transfer funct...

Embodiment 2

[0084] This embodiment proposes a noise reduction earphone, including a feedforward filter designed using the feedforward filter design method of Embodiment 1, and also includes a feedforward microphone and a speaker, the feedforward microphone is connected to the feedforward filter, and the feedforward filter amp and speaker connections. The feed-forward microphone converts the detected noise signal into an electrical signal, and transmits the electrical signal to the feed-forward filter, and the feed-forward filter generates a noise-cancelling signal accordingly, and the noise-cancelling signal is transmitted to the speaker, and then played by the speaker Eliminate noise waves, noise elimination waves interfere with noise sound waves, and achieve noise elimination.

[0085] The noise-cancelling headphones above also include a feedback filter, which can be designed separately. The noise-cancelling headphones with both a feed-forward filter and a feedback filter can achieve wi...

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Abstract

The present invention provides a feed-forward filter design method and noise reduction earphone, and relates to the technical field of active noise reduction. The method comprises the steps of: determining complex representation of main channel sound transmission features and complex representation and secondary channel sound transmission features for the sound transmission feature amplitude and the phase frequency curve of a main channel and the sound transmission feature amplitude and the phase frequency curve of a secondary channel; according to the complex representation of main channel sound transmission features and the complex representation and secondary channel sound transmission features, determining an amplitude frequency curve of an ideal feed-forward filter; and based on the amplitude frequency curve of the ideal feed-forward filter and an amplitude tracking method, a transfer function of the feed-forward filter is determined. The feed-forward filter design method and thenoise reduction earphone can effectively reduce the calculated amount of the feed-forward filter design method while ensuring the noise reduction effect of the feed-forward filter so as to save the computing time and improve the design efficiency of the feed-forward filter.

Description

technical field [0001] The invention relates to the technical field of active noise reduction, in particular to a design method of a feedforward filter and a noise reduction earphone. Background technique [0002] Active noise canceling earphones use filters to generate a noise canceling signal that is equal in amplitude to the noise signal and opposite in phase, and eliminates the interference between noise waves and noise sound waves to achieve the effect of noise cancellation. According to the topology of the noise reduction system of active noise reduction headphones, the filter is divided into a feedforward filter and a feedback filter. The design of the feedforward filter is simpler than that of the feedback filter, and it will not cause the noise reduction system to be unstable. problem, so feed-forward filters are widely used in active noise-canceling headphones. [0003] At present, the feedforward filter is designed based on the acoustic characteristic transfer fu...

Claims

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Application Information

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IPC IPC(8): H04R1/10H04R3/00
CPCH04R1/1083H04R3/00H04R2420/03H04R2430/03
Inventor 蒋飞虞安波
Owner HUITING ACOUSTICS TECH BEIJING CO LTD
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