Frequency shift keying system

Details Frequency shift keying system Frequency shift keying system

1981-06-19

1983-01-11

Moore, David K.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 62, H04I 2712

Patent

active

043684394

ABSTRACT:
In a frequency shift keying system, sine waves of different frequencies f.sub.0 and f.sub.1 are selectively provided as a modulated output signal in accordance with the level of an input code. One of two pulse signals having frequencies N times higher than the frequencies f.sub.0 and f.sub.1 is selected by a selector in accordance with the level of the input code, and the selector output pulse signal is frequency divided by a counter down to 1/N to obtain a pulse signal having a duty ratio of 50% and a frequency of f.sub.0 or f.sub.1. The pulse signal obtained is converted by a low-pass filter into a sine wave. The modulated output signal has no phase shift even at the point of transition of the input code level and has continuity and hence has little modulation distortion.

REFERENCES:
patent: 3740669 (1973-06-01), Nahay
patent: 3991389 (1976-11-01), Dwire

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