Pulse or digital communications – Repeaters – Testing
Patent
1989-07-19
1991-10-15
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 39, 371 43, H03D 500, H03K 710
Patent
active
050581350
ABSTRACT:
An arrangement by which a sinusoidal wave is modulated in phase and amplitude in response to groups of bits includes an input (1) for receiving the groups of bits, a phase shifting circuit (5, 7) for producing two phase-shifted components of the wave and a modulating circuit for modulating the amplitude of the two components as a function of the groups. The modulating circuit includes a ROM (25), addressed by part of the n bits of the bit groups for producing an initial amplitude value, and a calculating unit (30) for obtaining final amplitude values by changing original values according to the remaining part of the bits of the bit groups.
REFERENCES:
patent: Re33041 (1989-08-01), Calderbank et al.
patent: 4327439 (1982-04-01), Glockler et al.
patent: 4404532 (1983-09-01), Welti
patent: 4442530 (1984-04-01), Parrish, Jr. et al.
patent: 4745628 (1989-05-01), McDavid et al.
patent: 4894844 (1990-01-01), Forney, Jr.
patent: 4901331 (1990-02-01), Calderbank et al.
L. Mary, "Processeurs de Signaux: Capacite et Performances", Toute L'Electroniques, No. 7, Oct. 1987, pp. 52-60.
Chin Stephen
Slobod Jack D.
Telecommunications Radioelectriques et Telephoniques T.R.T.
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