Feedback suppression using phase enhanced frequency estimation

Patent metadata

Field	Value
Publication number	US-9307320-B2
Application number	US-201414339995-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Jul 24, 2014
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A feedback suppression system for reducing acoustic feedback may include a controller configured to buffer a series of incoming digital sample signals to provide a plurality of buffered signals, the incoming digital sample signal being indicative of an audio input signal that includes audio data and acoustic feedback, determine a complex spectrum of the plurality of buffered signals, determine a magnitude squared spectrum from the complex spectrum, identify at least one peak in the magnitude squared spectrum, identify a frequency of the at least one identified peak using a phase enhanced frequency estimate, and set a notch filter at the identified frequency to eliminate the acoustic feedback of the audio input signal.

First claim

What is claimed is:

1. A feedback suppression system for reducing acoustic feedback, comprising:
a controller configured to:
buffer a series of incoming digital sample signals to provide a plurality of buffered signals, the incoming digital sample signal being indicative of an audio input signal that includes audio data and acoustic feedback;
determine a complex spectrum of the plurality of buffered signals;
determine a magnitude squared spectrum from the complex spectrum;…

Assignees

• Harman Int Ind

Inventors

• Rutledge Glen A
• Campbell Norm
• Lupini Peter R
• Belcher Christopher M

Classifications

• H04R3/02 Primary

  Electricity · mapped topic