Patent ID: 9712915
Date: 2017-07-18
CPC Classifications: G10L,H04M,H04R

Claim:
1. A method, comprising: receiving a far end signal from a far end user and broadcasting the far end signal at a loudspeaker; determining a signal for use in estimating an echo transfer function, the signal selected from between: the far end signal and an echo reference signal received from a near field microphone disposed in close proximity to the speaker, the determining the signal based at least in part on a comparison between the far end signal and the echo reference signal, the near field microphone sensing the far end signal that is broadcast from the speaker; determining an echo transfer function based at least in part upon the selected signal, the echo transfer function representing characteristics of an acoustic path between the loudspeaker and a far field microphone that is disposed at a greater distance from the speaker than the near field microphone; determining an estimated echo based at least in part upon the echo transfer function; subtracting the estimated echo from a signal received from the far field microphone, the subtracting effective to cancel an echo present in the signal received from the far end microphone.