Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation

An adaptive filter and audio technology, which is applied in the field of frequency band limitation and anti-noise signal, can solve problems such as adverse consequences, extra power consumption, complex adaptive noise cancellation circuit, etc., and achieve the effect of eliminating shortcomings and problems

Active Publication Date: 2016-10-12
CIRRUS LOGIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adaptive noise cancellation circuitry can be complex, cons...

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  • Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation
  • Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation
  • Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation

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Embodiment Construction

[0020] now refer to Figure 1A , a personal audio device 10 as shown in accordance with an embodiment of the present disclosure is shown proximate to a human ear 5 . Personal audio device 10 is an example of a device that may employ techniques in accordance with embodiments of the present invention, but it should be understood that not all of the elements or configurations present in the illustrated personal audio device 10 or in the circuits shown in subsequent illustrations are required, In order to carry out the invention stated in the claims. The personal audio device 10 may include a transducer, such as a speaker SPKR, that reproduces the long-range speech received by the personal audio device 10, along with other local audio events, such as ringtones, stored audio programming material, injection to provide balance Conversationally perceived near-end speech (i.e., the voice of the user of the personal audio device 10), as well as other audio that needs to be reproduced by...

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Abstract

A method may include adaptively generating an anti-noise signal from filtering a reference microphone signal with an adaptive filter in conformity with an error microphone signal and the reference microphone signal. The method may also include adjusting the response of the adaptive filter by combining injected noise with the reference microphone signal and receiving the injected noise by a copy of the adaptive filter so that the response of the copy is controlled by the adaptive filter adapting to cancel a combination of the ambient audio sounds and the injected noise and controlling the response of the adaptive filter with the coefficients adapted in the copy, whereby the injected noise is not present in the anti-noise signal and wherein each of a sample rate of the copy and a rate of adapting of the adaptive filter is significantly less than a sample rate of the adaptive filter.

Description

[0001] related application [0002] This disclosure claims priority to US Patent Application Serial No. 14 / 101,955, filed December 10, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates generally to adaptive noise cancellation in relation to acoustic transducers, and more particularly to band limiting anti-noise signals in personal audio devices with adaptive noise cancellation. Background technique [0004] Personal audio devices, such as mobile / cellular phones, cordless phones, and other consumer audio devices, such as MP3 players and headsets or earbuds, are widely used. The performance of such devices can be improved in terms of clarity by setting noise cancellation to measure ambient sound events using a microphone and then using signal processing to inject an anti-noise signal into the output of the device to cancel the ambient sound events. Because the acoustic environment around a personal...

Claims

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Application Information

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IPC IPC(8): G10K11/178
CPCG10K2210/3017G10K2210/3051G10K11/17881G10K11/17854G10K2210/3053G10K11/17815G10K11/17817G10K11/17823G10K11/17885H04R3/002H04R2410/03
Inventor 杰弗里·D·奥尔德森
Owner CIRRUS LOGIC INC
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