Telephonic communications – Echo cancellation or suppression
Reexamination Certificate
2005-09-13
2005-09-13
Tran, Sinh (Department: 2644)
Telephonic communications
Echo cancellation or suppression
C379S406020, C379S406040, C379S406050, C379S406060, C379S406080, C379S406090, C379S406110
Reexamination Certificate
active
06944288
ABSTRACT:
A process is described which generates matrix coefficients using zero-lag auto and cross-correlations from signals commonly found in echo cancellers. Double-talk and path changes are then detected using matrix operations such as determinants, eigendecompositions, or singular value decompositions (SVDs). In a preferred embodiment, the determinant of the correlation-based matrix is compared against predetermined threshold values.
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(Marks & Clerk)
Mitchell Richard J.
Singh Ramnandan
Zarlink Semiconductor Inc.
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