Communication of a voice signal via continuous quadrature amplitude modulator
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United States of America Patent
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Jan 14, 1992
Grant Date -
N/A
app pub date -
Jan 6, 1989
filing date -
Jan 6, 1989
priority date (Note) -
Expired
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Abstract
A method and apparatus for communicating a voice conversation over a single telephone channel using continuously variable level quadrature amplitude modulation establishes and maintains two totally independent communication paths, each near perfect in amplitude and phase with respect to frequency over a bandwidth suitable for communication of continuously variable amplitude pulses. These pulses may be representations of any suitable bandlimited analog signal. The method establishes almost flawless QAM channels (real, imaginary), then allows switching to continuously variable amplitude analog transmissions.
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