Methods for reducing noise in optical biological sensors
US-2015382105-A1 · Dec 31, 2015 · US
Adaptive-noise canceling (ANC) effectiveness estimation and correction in a personal audio device
US9106989B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9106989-B2 |
| Application number | US-201314029159-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 17, 2013 |
| Priority date | Mar 13, 2013 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
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Techniques for estimating adaptive noise canceling (ANC) performance in a personal audio device, such as a wireless telephone, provide robustness of operation by triggering corrective action when ANC performance is low, and/or by saving a state of the ANC system when ANC performance is high. An anti-noise signal is generated from a reference microphone signal and is provided to an output transducer along with program audio. A measure of ANC gain is determined by computing a ratio of a first indication of magnitude of an error microphone signal that provides a measure of the ambient sounds and program audio heard by the listener including the effects of the anti-noise, to a second indication of magnitude of the error microphone signal without the effects of the anti-noise. The ratio can be determined for different frequency bands in order to determine whether particular adaptive filters are trained properly.
First claim
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What is claimed is: 1. A personal audio device, comprising: a personal audio device housing; a transducer mounted on the housing for reproducing an audio signal including both source audio for playback to a listener and an anti-noise signal for countering effects of ambient audio sounds in an acoustic output of the transducer; a reference microphone mounted on the housing for providing a reference microphone signal indicative of the ambient audio sounds; an error microphone…
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Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Electricity · mapped topic
Physics · mapped topic
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- What does patent US9106989B2 cover?
- Techniques for estimating adaptive noise canceling (ANC) performance in a personal audio device, such as a wireless telephone, provide robustness of operation by triggering corrective action when ANC performance is low, and/or by saving a state of the ANC system when ANC performance is high. An anti-noise signal is generated from a reference microphone signal and is provided to an output transd…
- Who is the assignee on this patent?
- Cirrus Logic Inc
- What technology area does this patent fall under?
- Primary CPC classification H04R3/002. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 11 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).