Digital FSK time rate of change modulator

Details Digital FSK time rate of change modulator Digital FSK time rate of change modulator

1975-12-24

1976-12-14

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 18, 325163, H04L 2712

Patent

active

039978559

ABSTRACT:
A digital FSK time rate change modulator is responsive to a digital input signal and generates either a first or a second output frequency. The FSK modulator switches from one output frequency to the other in small increments over a predetermined time interval. The FSK modulator includes means for generating a first and a second timing signal and input means for receiving the digital input signal. An up-down counter having an up-count input and a down-count input counts up and down between a first and a second state. First gating means is coupled to the output of the up-down counter and to the input means and passes the second timing signal to the up-count input when a high level digital input signal is present on the input means and the up-down counter is not in the second state. Second gating means is coupled to the output of the up-down counter and to the input means and passes the second timing signal to the down-count input when a low level digital signal is present on the input means and the up-down counter is not in the first state. Variable counter means divides the first timing signal by predetermined number in response to the count on the up-down counter and generates a digital output signal. Sine wave generator means is coupled to the variable counter means and generates a digitally approximated sine wave having the same frequency as the digital output signal from the variable counter means.

REFERENCES:
patent: 3548320 (1970-12-01), Roberts et al.
patent: 3659226 (1972-04-01), Angeleri et al.
patent: 3713017 (1973-01-01), Vena

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