Sound-dependent anr signal processing adjustment

Abstract

ANR circuit to provide ANR comprising: a first ADC; a DAC; a first digital filter; a first pathway within the ANR circuit through which digital data representing sounds flows from the first ADC to the DAC through at least said filter at a first data transfer rate through at least part of the first pathway; first and second ANR settings buffers to be alternately employed in configuring first and second ANR settings in synchronization with a transfer of a piece of digital data transferred through at least part of the first pathway at the first data transfer rate; a mask to selectively enable the configuring of one or the other of the first and second ANR settings through alternately employing the first and second ANR settings buffers; and a third ANR settings buffer to store first and second failsafe ANR settings to configure the first and second ANR settings in response to an instance of instability being detected in the ANR circuit.

Description

technical field [0001] The present disclosure relates to personal active noise reduction (ANR) devices for reducing acoustic noise near at least one of a user's ears. Background technique [0002] Headphones and other physical configurations of personal ANR devices worn around a user's ear for the purpose of acoustically isolating the user's ear from unwanted ambient noise have become commonplace. In particular, ANR headphones, in which the unwanted ambient noise sounds are counteracted by the active generation of anti-noise sounds, have become very popular, even when compared to only passive noise reduction in which the user's ears are simply physically isolated from the ambient noise ( The same goes for headphones or earbuds with PNR) technology. Of particular interest to users is the ability to also incorporate audio listening functionality so that the user can listen to electronically provided audio (e.g., playback of recorded audio or audio received from another device...

AI Technical Summary

Problems solved by technology

[0003] Unfortunately, despite various improvements over time, existing personal ANR devices continue to suffer from several shortcomings

Foremost among these disadvantages are an undesirably high power consumption rate which in turn leads to short battery life, an undesirably narrow audible frequency range in which ANR is used to counteract undesired ambient noise sounds, an The situation of unpleasant sounds for people, and the situation that actually produces more unwanted noise sounds than any can reduce the unwanted ambient sounds

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