Telegraphy – Systems – Alternating or pulsating current
Patent
1976-12-20
1978-08-08
Griffin, Robert L.
Telegraphy
Systems
Alternating or pulsating current
325 42, 325 45, 179 15A, H04L 2724
Patent
active
041058631
ABSTRACT:
To minimize distortion, a sequence of phase modulated signal elements (data symbols) are combined in accordance with a predetermined shaping (weighting) function by a transversal filter augmented with a baud rate control circuit. The transversal filter includes a plurality of multipliers, located at taps along a delay line, forming products between data symbols and coefficients representing segments of the predetermined weighting function. The baud rate control circuit shifts the phase of the delayed data symbols and delivers these "extended" data symbols to certain multipliers. By digitally processing segments of the weighting function and portions of an overall data symbol this invention yields to compact construction.
REFERENCES:
patent: 2982852 (1961-05-01), Fano
patent: 3128342 (1964-04-01), Baker
patent: 3225142 (1965-12-01), Schroeder
patent: 3502986 (1970-03-01), Lucky
patent: 3921072 (1975-11-01), Sato
patent: 3959637 (1976-05-01), Nussbaumer
patent: 3990022 (1976-11-01), Van Gerwen
patent: 4016410 (1977-04-01), Eggermont
patent: 4027258 (1977-05-01), Perreault
Bell Telephone Laboratories Incorporated
Griffin Robert L.
Lipton Roy C.
Masinick Michael A.
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