Feedback howl management in adaptive noise cancellation system
US10290296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2016 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Nov 7, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/01
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An integrated circuit may include an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer, an ambient microphone input for receiving an ambient microphone signal indicative of the ambient audio sounds; an error microphone input for receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer; and a processing circuit that implements a feedback path having a feedback response that generates a feedback anti-noise signal from the error microphone signal, wherein a signal gain of the feedback path is a function of the ambient microphone signal, and wherein the anti-noise signal comprises at least the feedback anti-noise signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.