Multivalued FSK demodulation window comparator

Details Multivalued FSK demodulation window comparator Multivalued FSK demodulation window comparator

1997-09-12

1999-09-07

Kinkead, Arnold

Demodulators

Frequency shift keying or minimum shift keying demodulator

Including logic element (e.g., logic gate or flip-flop

329300, 327 74, 327 75, 375324, 375334, 375317, 4551613, 455134, H04L 2714, H04L 2506

Patent

active

059492805

ABSTRACT:
A multivalued FSK demodulation window comparator includes an MSB comparator, an LSB comparator, a reception electric field strength detector, and a reference voltage generating circuit. The MSB comparator determines at least the polarity of a frequency shift of a radio frequency. The LSB comparator determines the absolute value of the frequency shift of the radio frequency. The reception electric field strength detector detects the strength of a radio signal and outputs a signal corresponding to the detected strength. The reference voltage generating circuit changes the reference voltages of the LSB comparator in accordance with an output voltage from the reception electric field strength detector. When the output voltage from the reception electric field strength detector is not higher than a predetermined level, a reference voltage from the reference voltage generating circuit changes.

REFERENCES:
patent: 5710795 (1998-01-01), Tsumura

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