Patent Number: 6,434,247

Title: Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms

Abstract: A feedback cancellation system for a hearing aid or the like adapts a first filter in the feedback path that models the quickly varying portion of the hearing aid feedback path, and adapts a second filter in the feedback path that is used either as a reference filter for constrained adaptation or to model more slowly varying portions of the feedback path. The second filter is updated only when the hearing aid signals indicate that an accurate estimate of the feedback path can be obtained. Changes in the second filter are then monitored to detect changes in the hearing aid feedback path. The first filter is adaptively updated at least when the condition of the signal indicates that an accurate estimate of physical feedback cannot be made. It may be updated on a continuous or frequent basis.

Inventors: Kates; James Mitchell (Niwot, CO), Melanson; John Laurence (Boulder, CO)

Assignee: GN ReSound A/S

International Classification: H04R 25/00 (20060101); H04R 025/00 ()

Expiration Date: 08/13/2019