Communications: electrical – Digital comparator systems
Patent
1977-09-26
1978-12-05
Atkinson, Charles E.
Communications: electrical
Digital comparator systems
325 41, G06F 1112
Patent
active
041288289
ABSTRACT:
The differential detection system comprises a demodulator for a modulated carrier transmission system for binary signals, in which a symbol detected from the phase difference between the received signal delayed by one signaling interval and the signal received in the present signaling interval is converted into data and a symbol detected from the phase difference between the received signal delayed by two signaling intervals and a signal received in the present signaling interval is converted into parity. The data and the parity are applied to a decoder for a rate 1/2 single error correcting self-orthogonal convolutional code effecting demodulation with non-redundant error correction. The correction system is also applicable to demodulate a carrier wave modulated by m (an integer) level digital data.
REFERENCES:
patent: 3529290 (1970-09-01), Schroeder et al.
patent: 3891959 (1975-06-01), Tsuji et al.
patent: 3939473 (1976-02-01), Fuchs
patent: 3978406 (1976-08-01), Matsumoto et al.
patent: 4035767 (1977-07-01), Chen et al.
patent: 4055832 (1977-10-01), En
Hirade Kenkichi
Samejima Shuichi
Atkinson Charles E.
Helzer Charles W.
Nippon Telegraph and Telephone Public Corp.
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