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Title: Asynchronous quadriphase communications system and method

Abstract: A communications system and method for transmitting and receiving two independently timed (asynchronous) binary data signals on a quadriphase carrier. The four phase ambiguity ordinarily resulting from quadriphase transmission and reception is overcome by uniquely identifying one input channel, for example, by slightly increasing the clock rate of the channel. In reception each channel is demodulated and the data rate of each channel is examined to identify the increased clock rate channel. That channel is then returned to its original clock rate.


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Inventors: Gill, Walter J. (Saratoga, CA, US)
Mellenger, James A. (Sunnyvale, CA, US)

Application Number: 467656
Filing Date: 1974-05-07
Publication_date: 1976-01-06
Assignee: Avantek, Inc. (Santa Clara, CA)
Primary Class(es): 370/206 370/505, 370/914, 375/281, 375/283, 380/268
Other Classes:
US Patent Ref:
3736507May, 1973Wolejsza178/67.
3809817May, 1974Gill179/15.

Other Refs:
Primary Examiner: Cooper, William C.
Assistant Examiner: Kemeny, E. S.
Attorney: Limbach, Limbach & Sutton