Asymmetric duplex modem utilizing narrow band echo cancellation
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United States of America Patent
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-
Nov 26, 1996
Grant Date -
N/A
app pub date -
Feb 9, 1994
filing date -
Feb 9, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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