ANR signal processing enhancement

Abstract

An ANR circuit, (possibly of a personal ANR device and possibly within an ADC of the ANR circuit), feedback reference data, feedforward reference data and / or pass-through audio data is provided to a secondary downsampling (and / or decimating) filter and / or is provided to a calculating block (e.g., RMS or absolute calculation block) to derive side-chain data to be output by the ANR circuit to a processing device coupled to the ANR circuit to employ the side-chain data in an analysis related to the provision of feedback-based ANR, feedforward-based ANR and / or pass-through audio by the ANR circuit.; In an ANR circuit of a personal ANR device, a digital filter is structured to introduce one or more zeros to add gain to introduce positive phase in the provision of feedback-based ANR, wherein the gain follows a frequency-dependent ''ski-slope'' gain curve with little gain added at lower audible frequencies, with increasing gain that increases with frequency added at higher audible frequencies, and with the increasing gain flattening at frequencies above audible frequencies.

Description

[0001] This application is a divisional application of the PCT application for invention patent No. 201080026213.1 (named "ANR signal processing enhancement") submitted on April 26, 2010. technical field [0002] 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 [0003] 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 ...

AI Technical Summary

Problems solved by technology

[0004] 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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