| 摘要 |
<p>A system and a method for echo suppression which use two or more microphones (22, 36 and/or 68) for beamforming of an echo signal (L') corresponding to an incoming speech signal (L) that is output by a loudspeaker (20). The outputs of the microphones (22, 36 and/or 68) are appropriately filtered and then linearly combined (Figs. 3-7 and 10-11) to cancel the echo signal (L'), even if the incoming speech signal (L) has been non-linearly distorted (e.g., in a digital-to-analog converter (16), an amplifier (18) and/or the loudspeaker (20). Also, the microphones (22, 36 and/or 68) may be selectively positioned or pointed (e.g., as shown in Figs. 8-9) to allow linear cancellation of ambient noise (N).</p> |
