Asymmetric duplex modem utilizing narrow band echo cancellation

Details Asymmetric duplex modem utilizing narrow band echo cancellation Asymmetric duplex modem utilizing narrow band echo cancellation

1996-09-16

1999-04-06

Jung, Min

Multiplex communications

Duplex

Transmit/receive interaction control

375222, 379410, H04B 323

Patent

active

058927573

ABSTRACT:
A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is capable of transmitting or receiving over either of the channels, depending on the relative data rates. A narrow band echo canceler substantially cancels all or part of reflected transmit signals. Because the echo cancellation technique employed is narrow band, there is a significant reduction in the complexity and computational requirements for the modem.

REFERENCES:
patent: 5007047 (1991-04-01), Sridhar et al.
patent: 5070514 (1991-12-01), Tjahjadi
patent: 5289459 (1994-02-01), Brownlie
patent: 5394392 (1995-02-01), Scott

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