Pulse or digital communications – Repeaters – Testing
Patent
1985-09-30
1987-10-13
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
332 16R, 375 44, 375 49, 375 51, H04L 2712
Patent
active
047003642
ABSTRACT:
A FSK code with reduced high frequency content is generated. First through fourth waveforms are provided to a selector which selects one of the four waveforms in accordance with a control signal which, in turn, is generated in accordance with a state indication signal identifying the presently selected one of the four waveforms. A D/A converter converts the selected digital waveform data to an analog waveform signal. First and second of the digital waveform data represent +sin .theta. and -sin .theta., and third and fourth of the digital waveform data represent +f(.theta.) and -f(.theta., respectively, where ##EQU1## wherein 0.ltoreq..theta..ltoreq.2.pi. and a, b and c are nonzero coefficients.
REFERENCES:
patent: 3048784 (1962-08-01), Scherer
patent: 3223925 (1965-12-01), Florac, Jr. et al.
patent: 3325595 (1967-06-01), Dascotte
patent: 3377625 (1968-04-01), Filipowsky
patent: 3987374 (1976-10-01), Jones, Jr.
patent: 4339724 (1982-07-01), Feher
patent: 4410955 (1983-10-01), Burke et al.
Koike Shin'ichi
Koyama Tetsu
Miyazaki Tomohiro
NEC Corporation
Safourek Benedict V.
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