Check patentability & draft patents in minutes with Patsnap Eureka AI!

Circuit and method for performance and stability control of feedback adaptive noise cancellation

An anti-noise, integrated circuit technology, applied in active noise cancellation hearing devices, active noise control, earphones to reduce environmental noise, etc., can solve problems such as feedback controller instability

Active Publication Date: 2017-11-28
CIRRUS LOGIC INC
View PDF10 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, if the secondary path of the device using ANC changes, then the feedback controller can become unstable

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Circuit and method for performance and stability control of feedback adaptive noise cancellation
  • Circuit and method for performance and stability control of feedback adaptive noise cancellation
  • Circuit and method for performance and stability control of feedback adaptive noise cancellation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention includes noise cancellation techniques and circuits that may be implemented in personal audio equipment such as wireless telephones. Personal voice devices contain ANC circuitry that can measure the ambient acoustic environment and generate a signal that is injected into the speaker (or other transducer) output to cancel out ambient acoustic events. A reference microphone may be provided to measure the ambient acoustic environment, and an error microphone may be included for controlling adaptation of the anti-noise signal to cancel ambient audio sounds and for correcting the electro-acoustic path from the output of the processing circuit through the transducer.

[0025] The present invention includes noise cancellation techniques and circuits that may be implemented in personal audio equipment such as wireless telephones. Personal voice devices contain ANC circuitry that can measure the ambient acoustic environment and generate a signal that is inj...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for cancelling ambient audio sounds in the proximity of a transducer may include receiving an error microphone signal indicative of the output of the transducer and ambient audio sounds at the transducer. The method may also include generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer, wherein generating the anti-noise signal comprises applying a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal and applying a variable gain element in series with the feedback filter. The method may further include monitoring whether an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal and controlling the gain of the variable gain element to reduce the undesirable component.

Description

[0001] related application [0002] This application claims priority to US Nonprovisional Patent Application Serial No. 14 / 577,519, filed December 19, 2014, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to adaptive noise cancellation associated with acoustic transducers, and more particularly to performance and stability control for feedback active noise cancellation. Background technique [0004] Wireless telephones such as mobile / cellular telephones, cordless telephones and other consumer voice devices such as mp3 players are in widespread use. Noise cancellation can be provided to improve the performance of these devices in terms of intelligibility by using a microphone to measure the ambient sound event and then using signal processing to insert an anti-noise signal into the output of the device to cancel the ambient sound event. [0005] In an adaptive noise cancellation system, it is general...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G10K11/178
CPCG10K2210/1081G10K2210/506G10K2210/503G10K2210/3056G10K11/17833G10K11/17881G10K11/17875H04R1/1083H04R2460/01G10K11/17885G10K11/17835G10K11/17817G10K11/178G10K11/17819G10K11/17823G10K11/17854
Inventor 路阳D·周安东尼奥·J·米勒N·李
Owner CIRRUS LOGIC INC
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com