Frequency shift key demodulator

Details Frequency shift key demodulator Frequency shift key demodulator

1974-09-16

1976-09-07

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325320, 325325, 329126, H03D 300, H04L 2714

Patent

active

039796850

ABSTRACT:
A demodulator for detecting first and second frequencies in an analog input signal includes a limiter providing first pulses having a short duration in response to the first frequency and having a long duration in response to the second frequency. A first counter provides a first reference signal including second pulses, and a second counter provides a second reference signal including third pulses. Logic means responsive to the second and third pulses provide a signal including fourth pulses during periods corresponding to the first frequency and a signal including fifth pulses during periods corresponding to the second frequency. An up-down counter is responsive to the fourth pulses to provide a first output signal and responsive to the fifth pulses to provide a second output signal. The fourth and fifth pulses have frequencies and durations providing the counter with substantially equal counting rates during the periods corresponding to the first and second frequencies of the analog signal.

REFERENCES:
patent: 3522539 (1970-08-01), Levine et al.
patent: 3656064 (1972-04-01), Giles et al.

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