Active noise control method and circuit, and related devices

An active noise control and circuit technology, which is applied in the field of portable electronic equipment and active noise control circuits, can solve the problems that low-pass filters cannot be used to reduce or eliminate noise, and reduce the performance of active noise cancellation systems.

Inactive Publication Date: 2018-08-21
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a fixed LPF with a flat frequency response introduces additional delay (side effect) to conventional ANC systems, and the unavailability of delays inevitably degrades the performance of conventional ANC systems, especially when the system is almost or When completely unrelated (no-causal)
Furthermore, a fixed low-pass filter with a flat frequency response cannot be used to effectively reduce or eliminate different types of noise, thus introducing additional side effects

Method used

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  • Active noise control method and circuit, and related devices
  • Active noise control method and circuit, and related devices
  • Active noise control method and circuit, and related devices

Examples

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Embodiment Construction

[0017] figure 1 is a flowchart of a method for adaptively or dynamically performing active noise control operations in a user's target area according to a first embodiment of the present invention. figure 2 is implemented figure 1 A block diagram of the portable electronic device 200 of the flowchart. In these embodiments, the target area refers to the quiet area of ​​the user's ear, and the shown method is used to perform ANC operation in this quiet area so that the noise in the quiet area can be reduced or eliminated as much as possible, that is, active noise cancellation or Adaptive noise control. A portable electronic device 200 , such as a mobile phone or a smart phone, includes a reference microphone 205 , an error microphone 210 and an ANC system circuit 215 . The reference microphone 205 is configured outside the target area and used to receive or detect external noise to generate a reference microphone signal Srm. The error microphone 210 is disposed within the t...

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Abstract

A method for performing active noise control upon a target zone includes: using an adaptive filtering circuit to receive at least one microphone signal obtained from a microphone; and, dynamically compensating at least one coefficient of the adaptive filtering circuit to adjust a frequency response of the adaptive filtering circuit according to an energy distribution of the at least one microphonesignal, so as to make the adaptive filtering circuit receive the at least one microphone signal to generate a resultant anti-noise signal to the target zone based on the dynamically adjusted frequency response.

Description

[0001] Related references [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 458,588, filed February 14, 2017, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to an adaptive active noise control mechanism, and more particularly, to a method for adaptively or dynamically performing active noise control operations in a target zone, such as the quite zone of a user's ear , active noise control circuits, and portable electronic equipment. Background technique [0004] Generally speaking, traditional active noise cancellation schemes are very useful for eliminating low-frequency noise, and are now widely used in headphones to enable users to obtain a better listening / communication experience. However, it often simultaneously generates some high-frequency noise (Hiss noise) that can be heard by the user. To attenuate the hiss noise, traditional active noise cancellation schemes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R2430/00H04R2227/001H04R2410/05H04R2499/11G10K2210/1081G10K2210/3025G10K11/17823G10K11/17881G10K11/17854H04R3/005H04R1/1083G10K11/178H04R3/002
Inventor 许肇凌郑尧文
Owner MEDIATEK INC
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