Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1974-05-09
1976-02-10
Brody, Alfred L.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
178 88, 325320, 328109, 328117, H04L 2722
Patent
active
039380521
ABSTRACT:
Digital logic apparatus for demodulating a received phase-modulated carrier wave wherein phase-shifts between successive signalling intervals encode data elements. A shift register serially stores periodic samples of a squared version of the received wave. Exclusive-OR gates compare pairs of stored wave samples, each pair comprising a sample from a previous signalling interval and a sample from a current signalling interval. At least one of the exclusive-OR gates derives synchronizing signals for a local timing generator. For each data element, an integrator is associated with one of the exclusive-OR gates to accumulate a count related to the time during which pairs of similar samples are sensed by its exclusive-OR gate during each signalling interval. The integrator registering the highest count at the end of a given data interval signifies the data element received during that interval. An alternate embodiment is disclosed for less critical applications wherein outputs from digital filters indicate the received data elements.
REFERENCES:
patent: 3209265 (1965-09-01), Baker et al.
patent: 3643023 (1972-02-01), Ragsdale et al.
patent: 3656064 (1972-04-01), Giles et al.
patent: 3729684 (1973-04-01), Shuda
patent: 3739277 (1973-06-01), Schneider et al.
patent: 3746995 (1973-07-01), Schroeder et al.
Jones--"Digital Frequency Discriminator"--IBM Tech. Disclosure Bulletin, Vol. 13, No. 11, Apr. 1971, pp. 3421-3422.
Glasson Jerry M.
King Ira S.
Brody Alfred L.
Green G. D.
Hurewitz D. L.
Landis J. L.
Teletype Corporation
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