Phase velocity sign detector for frequency shift key demodulatio

Details Phase velocity sign detector for frequency shift key demodulatio Phase velocity sign detector for frequency shift key demodulatio

1982-08-04

1985-02-12

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

307526, 328134, 329107, 329110, 375 88, 375 94, H03D 1300, H03K 906, H04L 2714

Patent

active

044994257

ABSTRACT:
A frequency shift key receiver includes a phase velocity sign detector which detects whether a FSK modulated input signal has a frequency (f.sub.FSK) which is greater than or less than a reference frequency (f.sub.0) of a REF signal. The phase velocity sign detector includes a sequence generator which generates a two bit binary code which represents the phase angle between the FSK and REF signals. The sequence of the code indicates the sign of the phase velocity between the FSK and REF signals. The phase velocity sign detector includes a sequence detector which provides an output signal indicating whether the FSK signal has a frequency greater than or less than the REF signal based upon the sequence of the code from the sequence generator. The phase velocity sign detector demodulates the FSK signal in the digital domain using circuitry which is completely integrable on a monolithic integrated circuit chip.

REFERENCES:
patent: 4264866 (1981-04-01), Benes

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