Composite shift keying communication system
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United States of America Patent
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Mar 18, 1986
Issued Date -
N/A
app pub date -
Sep 13, 1984
filing date -
Sep 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Composite Shift Keying (CSK) modulation technique is described which provides enhanced error detection capability in a noisy transmission medium, such as an AC power line. A modulating binary signal causes the generation of two of three possible transmitted signals, and when the modulating binary signal is idle, no signal is transmitted. When the modulating signal is active, a single frequency qualifying signal (of radian frequency Wqt) is transmitted. If the active binary signal is a logical 0, an additional single frequency (of radian frequency W0) is transmitted along with Wqt. If the active binary signal is a logical 1, a different single frequency (of radian frequency W1) is transmitted with Wqt.
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