Frequency shift key demodulator

Details Frequency shift key demodulator Frequency shift key demodulator

1982-08-04

1984-12-04

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

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

Patent

active

044867158

ABSTRACT:
A frequency shift key demodulator produces an output data stream based upon 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 reference (REF) signal. The demodulator 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 demodulator also includes first and second sequence detectors, first and second integrating shift registers, and a decision circuit. The first sequence detector provides an output signal to the first shift register indicating that the FSK signal has a frequency less than the REF signal based upon detection of a first predetermined sequence of the code from the sequence generator. Similarly, the second sequence detector senses a second predetermined sequence of the code indicating that the FSK signal has a frequency greater than the REF signal and provides an output signal to the second shift register. At the end of a predetermined time period, the decision circuit compares the content of the first and second shift registers and produces an output bit of the data stream.

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

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