Pulse or digital communications – Repeaters – Testing
Patent
1985-02-21
1986-11-25
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 45, 375 48, 375 62, 375 66, 332 16R, 331179, H04L 2712
Patent
active
046253181
ABSTRACT:
A data signal is encoded as frequency modulation by selecting carrier sources of different phases in response to data signals and filtering the resultant wave to produce an output deviating from the carrier frequency for one signal time in response to a single shift of phase. A phasing switch stores a record of the last sent phase and a record of the parity value of the number of zeros sent. The selected phase is as last sent for a 0, advanced for a 1 when the zero parity is of one value, and retarded when the zero parity is of another value.
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patent: 3803354 (1974-04-01), Bennett
patent: 4213094 (1980-07-01), Wood
Vale, "SAW Quadraphase Code Generator", IEEE Transactions on Microwave Theory & Techniques, vol. MTT-29, No. 5, May 1981.
Zeimer et al, "Conversion and Matched Filter Approximations for SMSK", IEEE Transactions on Communications, vol. COM-30, No. 3, Mar. '82.
"Faster Digital Communications with Duobinary Techniques", Electronics, Mar. 22, 1963, Adam Lender.
Glenny Raymond C.
Griffin Robert L.
Milik Kenneth L.
Shanahan Michael H.
Wang Laboratories, Inc.
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