Pulse or digital communications – Repeaters – Testing
Patent
1981-09-17
1984-01-17
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 47, 375 64, 332 23R, H04L 2712
Patent
active
044267100
ABSTRACT:
To obtain a duo-binary FSK modulation, the modulating binary signal train has a three state partial response and is fed through a precoding, a transition-type coding, a simplified MSK modulation at the carrier frequency, a frequency division by two, and a multiplication by the same signal delayed by one binary element period. In order to obtain a "tamed FSK" modulation, the modulating binary signal train has a five state partial response and is fed through precoding, a transition-type coding, a simplified MSK modulation at the carrier frequency, a frequency division by two, a multiplication by the same signal delayed, for one part, by one binary element period and, for the other part, by two binary element periods. A TFM modulation is obtained by using the FSK duo-binary generating process, but a wave shaping filter is connected between the division by two circuit and the multiplication circuit. In a TFM modulator, the train of binary signals is applied to a partial response precoding circuit, the output of which is connected to a transition-type coding circuit, the output of which is connected to the input of a simplified MSK modulator, the output of which is connected to the input of a frequency divider by two, the output of which is connected to the input of a wave shaping filter, the output of which is directly connected to an input of a multiplier, and to the other input of the multiplier via a delay-type circuit.
REFERENCES:
patent: 3388330 (1968-06-01), Kretzmer
patent: 3993868 (1976-11-01), Balcewicz
Griffin Robert L.
L'Etat Francais, represente par le Secretaire d'Etat aux Postes
National d'Etudes and Etablissement Publie de Diffusion dit
Watkins Albert W.
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