Granted Patent B2

US 6,990,193 · App. 10/306,154 · Granted Jan 24, 2006

Abstract

Claims (7)

1. A method of operating a full duplex speakerphone having a microphone array controlled by a beamformer to orient a beam from said microphone array in selected multiple look directions, and an acoustic echo canceller for canceling echo from said beamformer in accordance with information relevant to said multiple look directions, said method comprising the steps of:

a) capturing and storing said information relevant to said multiple look directions in respective locations of a memory, each of said locations being associated with a corresponding one of said multiple look directions; and

b) in response to a beamformer change from a current one of said look directions to a new look direction then retrieving from a memory location associated with said new look direction information that is relevant to said new look direction.

2. The method of claim 1 , wherein said information is captured to an active workspace from which said information is stored to said respective locations of memory.

3. The method of claim 1 , wherein said information includes at least one of echo path coefficients, level and frequency contents of background noise, data relating to optimal speed of adaptation, and level of residual echo.

4. The method of claim 1 , wherein said information relevant to respective ones of said multiple look directions is stored when said beamformer orients said beam to said respective selected multiple look directions.

5. The method of claim 1 , wherein said information relevant to respective ones of said multiple look directions is stored in said respective locations of memory immediately prior to a change in orientation of said beam.

Assignments (30)