Frequency demodulator, especially for data-transmission system

Details Frequency demodulator, especially for data-transmission system Frequency demodulator, especially for data-transmission system

1975-04-08

1976-06-01

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, H03D 320

Patent

active

039612775

ABSTRACT:
To demodulate an incoming oscillation consisting of a succession of distinct signal frequencies, particularly in a data-transmission system using an alternation of two keying frequencies, the incoming oscillation is squared and then passed through a differentiator deriving a pair of closely spaced trigger pulses from any zero crossing of the incoming oscillation. The first trigger pulse causes the transfer of the contents of a buffer register, receiving the reading of a pulse counter, into a digital/analog converter whose output is compared with a reference voltage in a threshold circuit; the second trigger pulse resets the counter which receives locally generated clock pulses whose cadence is high compared to the signal frequencies.

REFERENCES:
patent: 3670250 (1972-06-01), Fritkin
patent: 3761809 (1973-09-01), Lockitt

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