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Weighted Hybrid Active Noise Reduction System and Controller

A hybrid and controller technology, which is applied in the direction of instruments, sounding devices, frequency/direction characteristic devices, etc., can solve the problems of unstable feedback noise cancellation system and poor noise cancellation effect, and improve the problems that are prone to instability. , the effect of strengthening the treatment effect

Active Publication Date: 2022-04-05
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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  • Weighted Hybrid Active Noise Reduction System and Controller
  • Weighted Hybrid Active Noise Reduction System and Controller
  • Weighted Hybrid Active Noise Reduction 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 weighted hybrid active noise reduction system, which includes a reference microphone, an error microphone, a loudspeaker, and a controller connected to the reference microphone, the error microphone, and the loudspeaker. The controller includes a feedforward noise reduction filter module, a feedback noise reduction filter module, a mixer, a noise detection module, and a weight distribution module. The weight distribution module includes one or more weight modulation units arranged between the error microphone and the feedback noise reduction filter module, when the noise detection module detects high-frequency noise from the reference microphone or the error microphone The control signal is sent to the weight distribution module, and the weight distribution module reduces the weight value of the weight modulation unit to reduce the proportion of the feedback signal of the feedback noise reduction filter 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 Patents(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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