Pulse or digital communications – Repeaters – Testing
Patent
1980-12-15
1983-01-25
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
332 18, 360 43, 375 60, H03C 304
Patent
active
043707475
ABSTRACT:
A circuit arrangement for transmitting binary data elements `0` and `1` by frequency shift using two tone frequencies f0 and f1. The circuit arrangement comprises a modulator, an exclusive OR-gate and an integrator. A data signal DS produces from the modulator a digital signal DSS which by decoding of the integrator results in a tone signal TS comprising f0 or f1. The action of the OR-gate to which both signals DS and DSS are applied causes the amplitude of the tone signal TS to be substantially the same for each of the tone frequencies f0 and f1. The OR-gate may change either the effective resistive input into the integrator for each tone frequency or it may change the amplitude of the signal DSS for each tone frequency.
REFERENCES:
patent: 3408572 (1968-10-01), Wolf et al.
patent: 3659048 (1972-04-01), Zuerblis et al.
patent: 3806807 (1974-04-01), Nakamura
patent: 4170764 (1979-10-01), Salz et al.
patent: 4199821 (1980-04-01), Munday
Bugg Richard E. F.
Parkyn Derek J.
Biren Steven R.
Briody Thomas A.
Mayer Robert T.
Safourek Benedict V.
U.S. Philips Corporation
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