Adjustable digital FSK demodulator

Pulse or digital communications – Receivers – Angle modulation

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329303, H03D 300, H04L 2714

Patent

active

056848374

ABSTRACT:
An apparatus and method for demodulating a frequency-shift keyed (FSK) signal to provide a data signal. An input FSK signal is processed in a waveform reshaper to generate a first pulse signal which includes a pulse for each cycle of the FSK signal. The first pulse signal is processed in a cycle counter to generate second and third pulse signals. The second pulse signal includes a pulse for each time a low clock pulse count is reached between pulses of the first pulse signal, and the third pulse signal includes a pulse for each time a high clock pulse count is reached between pulses of the first pulse signal. The low and high pulse counts are generally indicative of cycles of first and second FSK carrier frequencies, respectively, in the input FSK signal. The second pulse signal is processed in a data recognizer to generate a logic level indicator signal. The indicator signal counts pulses of the second pulse signal to thereby provide an indication of the presence of a particular logic level in the FSK input signal. The third pulse signal and logic level indicator signal are processed in a data generator to provide the demodulated data signal. An FSK demodulator in accordance with the invention can be implemented entirely in digital circuitry. The cycle counter and data recognizer can be readily adjusted to accommodate a variety of different FSK protocols.

REFERENCES:
patent: 3979685 (1976-09-01), Motley et al.
patent: 4551846 (1985-11-01), Takeda et al.
patent: 4616187 (1986-10-01), Watanabe
patent: 5533061 (1996-07-01), Smith et al.

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