Pulse or digital communications – Repeaters – Testing
Patent
1986-08-04
1988-04-05
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
364721, 332 9R, H04L 2704
Patent
active
047363894
ABSTRACT:
A technique for digitally synthesizing the amplitude modulation of one or more carrier signals with a random digital data signal is disclosed. Pursuant to the present invention, a memory unit is addressed by a plurality of binary coded digital symbols in the data signal. For each address, at least two digital representations are read out. Each representation corresponds to a different sample of the carrier signals which has been amplitude modulated by a composite of the spectrally shaped data signal. The disclosed technique can be adapted to synthesize a variety of modulation formats, and can provide compensation for fixed in-rail and cross-rail distortions.
REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 4327419 (1982-04-01), Deutsch et al.
patent: 4493082 (1985-01-01), Cumberton et al.
patent: 4586023 (1986-04-01), Thompson
patent: 4599583 (1986-07-01), Shimozono et al.
patent: 4613976 (1986-09-01), Sewerinson et al.
patent: 4646326 (1987-02-01), Backof, Jr. et al.
Debus, Jr. Walter
Reeve, III Howard C.
Siller, Jr. Curtis A.
American Telephone and Telegraph Company
Bell Telephone Laboratories Incorporated
Padnes David R.
Safourek Benedict V.
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