Weighting mixed form active anti-noise system and controller

A hybrid, controller technology, applied in instruments, sounding instruments, frequency/direction characteristic devices, etc., can solve the problems of poor noise canceling effect and unstable feedback noise canceling system, achieve enhanced processing effect, and improve the easy-to-produce Unstable missing effects

Active Publication Date: 2019-12-24
LEEDARSON IOT TECH INC
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AI Technical Summary

Problems solved by technology

However, the traditional hybrid active noise cancellation architecture, when the noise is relatively high frequency and regular, the feedback noise cancellation system is prone to unstable conditions, resulting in poor noise cancellation effect

Method used

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  • Weighting mixed form active anti-noise system and controller
  • Weighting mixed form active anti-noise system and controller
  • Weighting mixed form active anti-noise system and controller

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Embodiment Construction

[0016] The detailed description and technical contents of the present invention are described as follows with respect to the accompanying drawings. Furthermore, for the convenience of explanation, the proportions of the drawings in the present invention are not necessarily drawn according to the actual scale. These drawings and their proportions are not intended to limit the scope of the present invention, and are described here first.

[0017] Embodiments of the present invention may be implemented in noise canceling devices or noise canceling controllers in personal listening systems including wired headphones, smartphone handsets, wireless headphones, or other head-worn audio devices, and are not addressed in the present invention. limit. The controller described in the present invention can be composed of a single chip or multiple chips. In another embodiment, the controller can be a chip provided by an audio device (such as a mobile device), or be integrated or separated ...

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Abstract

The invention provides a weighting mixed form active anti-noise system which comprises a reference microphone, an error microphone, a loudspeaker and a controller, wherein the controller is connectedto the reference microphone, the error microphone and the loudspeaker. The controller comprises a feed-forward noise reduction filtering module, a feedback noise reduction filtering module, a mixer, anoise detection module and a weight allocation module. The weight allocation module comprises one or a plurality of weight modulation units arranged between the error microphone and the feedback noise reduction filtering module. The noise detection module transmits control signals to the weight allocation module when the reference microphone or the error microphone detects high-frequency noise. The weight allocation module reduces the weight value of the weight modulation unit so as to reduce the proportion of feedback signals of the feedback noise reduction filtering module.

Description

technical field [0001] The present invention relates to an active anti-noise system and a controller, in particular to a weighted mixed type active anti-noise system and a controller. Background technique [0002] There are two modes of Active Noise Cancellation (ANC) technology currently used in headphones, which are called Feed-Forward Noise Cancellation and Feedback Noise Cancellation respectively. The joint combination is called hybrid (Hybrid) noise reduction. Different active noise reduction technologies have their own limitations in noise reduction depth and bandwidth, which are mainly determined by the acoustic structure of the earphone, signal processing and system signal delay. [0003] The working principle of the feedforward noise reduction system is mainly to output a signal with the same frequency response as the ambient noise but with an opposite phase to achieve noise reduction. The reference microphone detects the noise and generates an anti-phase signal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178H04R1/22
CPCG10K11/1781G10K11/17853G10K11/1787H04R1/22
Inventor 陈浩铭林义雄
Owner LEEDARSON IOT TECH INC
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