Apparatus of a digital echo canceller and method therefor

Details Apparatus of a digital echo canceller and method therefor Apparatus of a digital echo canceller and method therefor

2005-08-23

2005-08-23

Tieu, Binh (Department: 2643)

Telephonic communications

Echo cancellation or suppression

C379S406010, C379S406020, C379S406060, C370S286000, C370S293000

Reexamination Certificate

active

06934385

ABSTRACT:
An apparatus of a digital echo canceller comprises a first-set delay circuits, a selector, a second-set delay circuits, a plurality of multipliers and an adder. The first-set delay circuits are arranged into groups, and each group has N delay circuits. An exhaustive search function is carried out to produce a plurality of energy sums. The selector will select the biggest energy sum to serve as a significant part and then transmit to the outputs of the second-set delay circuits, the multipliers and the adder. An estimated echo signal is produced to cancel the echo signal.

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patent: 6477200 (2002-11-01), Agazzi et al.
patent: 6804204 (2004-10-01), Lee et al.

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