Full duplex communication system for voice grade channels
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United States of America Patent
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-
Oct 19, 1982
Grant Date -
N/A
app pub date -
Oct 15, 1980
filing date -
Oct 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pair of full duplex modems (12, 14), each at one end of a two-wire voice grade telephone channel (16), simultaneously transmit synchronous data at high speeds in both directions. In each modem, the simultaneous transmission and reception are accomplished by frequency division. The high speed operation is obtained by odd/even bit stream division and full response binary to ternary level coding coupled with nine level quadrature amplitude modulation and correction framing techniques.
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Cited Art Landscape
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