US 12,010,486 B2
Detection of feedback path change
Bryant E. Sorensen, State College, PA (US); and Brenton Steele, Victoria (AU)
Assigned to Eargo, Inc., San Jose, CA (US)
Filed by Eargo, Inc., San Jose, CA (US)
Filed on Oct. 11, 2022, as Appl. No. 17/963,648.
Application 17/963,648 is a continuation of application No. 17/239,427, filed on Apr. 23, 2021, granted, now 11,503,415.
Prior Publication US 2023/0051386 A1, Feb. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 25/00 (2006.01)
CPC H04R 25/453 (2013.01) [H04R 25/43 (2013.01); H04R 25/505 (2013.01); H04R 2225/023 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of signal processing an audio signal in a hearing device to detect when feedback path change occurs, the hearing device including a receiver and a microphone, the method comprising:
detecting whether a tonal signal is due to feedback onset by estimating a product of a subband error signal and a subband output signal generated in response to a subband audio input signal;
estimating a metric based upon the estimated product; and
detecting that said feedback path change occurs when the metric is greater than or equal to a predetermined threshold value.