Tuning method and related circuit for active noise reduction

An active, circuit technology, applied in transducer circuits, electrical components, sensor components, etc., can solve problems such as deteriorating the effect of active noise reduction

Active Publication Date: 2022-01-04
REALTEK SEMICON CORP
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AI Technical Summary

Problems solved by technology

However, it is not enough to only consider the primary path response. The secondary path response (Secondary path response) and the feedback path neutralization (FBPN) response are also major factors that deteriorate the effect of active noise reduction.
[0004] In this regard, the prior art solution to the secondary path response needs to be converged through the Least Mean Square (LMS) algorithm. However, these methods will inevitably face a trade-off between convergence speed, convergence stability, and accuracy after convergence.

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  • Tuning method and related circuit for active noise reduction
  • Tuning method and related circuit for active noise reduction
  • Tuning method and related circuit for active noise reduction

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Embodiment Construction

[0012] Certain terms are used throughout the specification and following claims to refer to particular components. Those of ordinary skill in the art will appreciate that hardware manufacturers may refer to the same component by different terms. The scope of this specification and the following claims does not use the difference in name as a way to distinguish components, but uses the difference in function of components as a criterion for distinguishing. The "comprising" mentioned in the entire specification and the following claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection me...

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Abstract

The invention discloses an adjustment method for active noise reduction and a related circuit. The active noise reduction circuit includes: an audio generating circuit; A time-domain signal; an audio receiver, configured to receive ambient sound as a second time-domain signal, wherein the ambient sound corresponds to the audio to be broadcast or the sound test signal; and a channel estimation unit, configured to receive the first a time-domain signal and the second time-domain signal, and performing time-frequency domain conversion on the first time-domain signal and the second time-domain signal respectively to obtain the first frequency-domain signal and the second frequency-domain signal, And generate a frequency response according to the first frequency domain signal and the second frequency domain signal; wherein the frequency response is used to adjust the active noise reduction coefficient of the active noise reduction circuit to optimize the noise reduction effect.

Description

technical field [0001] The present invention relates to an audio calibration method and related circuits, in particular to a method capable of improving the noise reduction effect of active noise cancellation (Active noise cancellation, ANC) earphones and related circuits. Background technique [0002] When using earphones to listen to music, the noise reduction function is an extremely important link. Among them, passive noise reduction is to slightly reduce the volume of the noise finally reaching the human ear through the material or structure of the earphone itself. Pleasant voice) did not improve much. Compared with passive noise reduction, the effect of active noise reduction is much more significant than passive noise reduction, so more and more earphone products use active noise reduction technology. [0003] In the product development of active noise-cancelling headphones, the first problem is the noise reduction degree that needs to be adjusted precisely. This nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R2410/05
Inventor 卓俊铭何维鸿
Owner REALTEK SEMICON CORP
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