Entrainment avoidance with a transform domain algorithm
AssigneeStarkey Laboratories, Inc.
InventorLalin Theverapperuma
Life of this patent
Estimating the term…
Abstract
A system of signal processing an input signal in a hearing aid to avoid entrainment, the hearing aid including a receiver and a microphone, the method comprising using a transform domain adaptive filter including two or more eigenvalues to measure an acoustic feedback path from the receiver to the microphone, analyzing a measure of eigenvalue spread against a predetermined threshold for indication of entrainment of the transform domain adaptive feedback cancellation filter, and upon indication of entrainment of the transform domain adaptive feedback cancellation filter, modulating the adaptation of the transform domain adaptive feedback cancellation filter.
Claims20
A method of signal processing an input signal in a hearing aid to avoid entrainment, the hearing aid including a receiver and a microphone, the method comprising:
- using a transform domain adaptive feedback cancellation filter to measure an acoustic feedback path from the receiver to the microphone, including separating an input of the transform domain adaptive feedback cancellation filter to a plurality of eigen components each representing a particular frequency band;
- analyzing a measure of eigenvalue spread of the plurality of eigen components against a threshold for indication of entrainment of the transform domain adaptive feedback cancellation filter, the threshold being a predetermined constant;
- and
- upon indication of entrainment of the transform domain adaptive feedback cancellation filter, modulating adaptation of the transform domain adaptive feedback cancellation filter.
An apparatus comprising:
- a microphone;
- a signal processor to process signals received from the microphone, the signal processor including a transform domain adaptive feedback cancellation filter, the transform domain adaptive feedback cancellation filter configured to provide an estimate of an acoustic feedback path for feedback cancellation and including a pre-filter configured to separate an input of the transform domain adaptive feedback cancellation filter to a plurality of eigen components each representing a particular frequency band;
- and
- a receiver adapted for emitting sound based on the processed signals,
- wherein the signal processor is adapted to detect entrainment of the transform domain adaptive feedback cancellation filter using an outcome of comparing a measure of eigenvalue spread of the plurality of eigen components to a predetermined threshold constant.
Dependencies are inferred from the claim text.