Information transmission arrangement using frequency modulation

Details Information transmission arrangement using frequency modulation Information transmission arrangement using frequency modulation

1989-12-18

1991-12-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329300, 332101, 375 65, 375 88, H04L 2710

Patent

active

050739034

ABSTRACT:
A control circuit (10) controls a voltage controlled oscillator (15) to cause the signal at the output of the oscillator to have slopes of frequency variation in accordance with biphase encoded data to be transmitted. The control circuit (10) limits abrupt frequency shifts in the oscillator output signal by inverting a sign multiplying the slope of frequency variation, utilizing an amplifier (50) with a controllable inversion state, in response to whether the state of the data to be transmitted, and a state, indicative of whether a frequency control voltage exceeds a zero threshold at sampling instants synchronous with the biphase data, are the same or different.

REFERENCES:
patent: 3959601 (1976-05-01), Olevsky et al.
patent: 4214208 (1980-07-01), O'Donnell
patent: 4438519 (1984-03-01), Bose
patent: 4468792 (1984-08-01), Baker et al.
patent: 4606049 (1986-08-01), Daniel
patent: 4849998 (1989-07-01), Poklemba

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