Method of automatic duplex or semi-duplex communication for two units via a telephone line
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United States of America Patent
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Feb 2, 1999
Grant Date -
N/A
app pub date -
Jun 29, 1995
filing date -
Nov 25, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and methods for establishing half-duplex communication between a first unit and a second unit over a telephone line. The first unit may transmit a first matching signal stream, the first matching signal stream including a first conditioning segment and a first unmodulated carrier signal having a first characteristic carrier frequency, the first characteristic carrier frequency representing a given transmission mode, the given transmission mode being in half-duplex. The second unit may analyze the first characteristic carrier frequency to recognize the given transmission mode.
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