Device for numerically generating a wave which is phase modulate

Details Device for numerically generating a wave which is phase modulate Device for numerically generating a wave which is phase modulate

1976-08-19

1978-07-11

Richardson, Robert L.

Telegraphy

Systems

Alternating or pulsating current

325145, 325163, 332 23R, H04L 2724

Patent

active

041003691

ABSTRACT:
A digital device has an input for receiving successive samples of input d in digital form representative of phase values .zeta.. A sequence of the most recent input samples is stored in an input memory. A carrier phase source provides a signal representative of the phase .theta. of a carrier wave. A function memory stores values of a function k.sub.i .multidot. sin (.zeta..sub.n-i +.theta..sub.n) and is addressed by first selection means which select a group corresponding to a coefficient k.sub.i and second selection means which select a member of the group corresponding to the value of (.zeta. + .theta.). During a calculation period the sum of all values of the function is calculated for i varying between l and a predetermined number r. Each such sum forms a sample of the output wave which is converted to analogue form and filtered to remove unwanted sampling components.

REFERENCES:
patent: 3597599 (1971-08-01), Melvin
patent: 3747024 (1973-07-01), Choquet
patent: 3935386 (1976-01-01), Glasson
patent: 3988540 (1976-10-01), Scott et al.

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