Automatic gain control for an adaptive finite impulse...

Details Automatic gain control for an adaptive finite impulse... Automatic gain control for an adaptive finite impulse...

2006-11-28

2006-11-28

Swerdlow, Daniel (Department: 2615)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S390030

Reexamination Certificate

active

07142665

ABSTRACT:
Methods and apparatus are provided for an echo cancellation system. The echo cancellation system comprises an automatic gain control (AGC), a first scalar, a second scalar, a signal summing stage, and an adaptive filter. The AGC is responsive to a first signal in a reference path and a second signal in a near end path. The signal summing stage is between the first and second scalar in the near end path and the first and second scalars are responsive to the AGC. The adaptive filter is responsive to the first signal and provides a third signal to the signal summing stage that corresponds to an echo signal and is subtracted from a signal in the near end path. The second scalar has a scale rate that is the inverse of the scale rate of the first scalar such that unity scaling occurs on the near end path.

REFERENCES:
patent: 4600815 (1986-07-01), Horna
patent: 4715063 (1987-12-01), Haddad et al.
patent: 5646990 (1997-07-01), Li

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