Simplified minimum shift keying modulator
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United States of America Patent
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Feb 19, 1985
Grant Date -
N/A
app pub date -
Dec 15, 1981
filing date -
Dec 15, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An MSK modulator having a simple construction with only a single necessary adjustment. The digital bit stream to be modulated is fed directly to the control input of a 0,.pi. phase shifter in a single-sideband modulator. A phase shift circuit is used to couple an IF signal to the IF signal input of the single-sideband modulator with the phase thereof adjusted by 0 or .pi. in response to two contiguous bits of the input data stream so as to maintain phase continuity in the output of the modulator for all possible bit combinations in the input stream.
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