Method and apparatus for providing echo cancellation

Details Method and apparatus for providing echo cancellation Method and apparatus for providing echo cancellation

2005-07-19

2005-07-19

Isen, Forester W (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406040, C370S286000, C370S292000

Reexamination Certificate

active

06920219

ABSTRACT:
A method for providing echo cancellation between a first and second communication unit detects an echo condition (200) between first and second communication units. In addition, the method includes detecting whether a decoded near end audio packet contains a suitable level of background noise to be used as a background noise packet. If so, the current near end encoded audio packet is stored (202) in a buffer (26), such as a circular buffer. Previous near end encoded audio packets (42) that are also determined to have a suitable level of background noise based on their decoded corresponding counterparts are also stored in the circular buffer. When an echo condition is detected with respect to a current near end encoded audio packet, the method includes substituting a previous near end encoded audio packet stored in the buffer as the next encoded audio packet for transmission (204).

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patent: 0194785 (1986-09-01), None

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