Patent ID: 9654874
Date: 2017-05-16
CPC Classifications: G10K,H04R

Claim:
1. A method for feedback detection by an electronic device, comprising: receiving a first microphone signal by a first microphone, wherein a feedback loop comprises the first microphone and a speaker; receiving a second microphone signal by a second microphone that is outside of the feedback loop; filtering the first microphone signal using a first filter to determine a first signal, wherein the first filter corresponds to a non-feedback transfer function from a processed first microphone signal to the second microphone that includes the speaker; filtering the second microphone signal using a second filter to determine a second signal, wherein the second filter corresponds to a feedback transfer function from the processed first microphone signal to the first microphone that does not include the speaker; determining a correlation between the first signal from a feedback path and the second signal from a non-feedback path, wherein the first signal and the second signal exhibit a higher correlation in the presence of feedback from the speaker to the first microphone and exhibit a lower correlation in absence of the feedback from the speaker to the first microphone; and determining whether the feedback from the speaker to the first microphone is occurring based on the correlation.