Receiver, a demodulator, and a demodulation method

Details Receiver, a demodulator, and a demodulation method Receiver, a demodulator, and a demodulation method

1997-05-02

1998-10-13

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

329300, 329302, 329303, H03D 300

Patent

active

058223789

ABSTRACT:
Known is a receiver having a demodulator for intermediate frequency modulated frequency shift keyed signals. The known demodulator applies absolute period time measurements expressing the period of a divided IF-signal into clock pulses of a relatively high frequency reference clock to detect data from a received signal. Such a demodulator is sensitive to frequency drift of the reference clock and has a relatively large power consumption. A receiver is proposed having a demodulator that is arranged to transform the intermediate frequency modulated frequency shift keyed signal into a lower frequency modulated frequency shift keyed signal so that the relative frequency deviation representing the data becomes substantially larger. The demodulator is arranged to determine the demodulated data from the lower frequency modulated frequency shift keyed signal by determining a difference in width of at least two successively measured periods of the lower frequency modulated frequency shift keyed signal and by generating a first logic signal value if the difference has a first polarity and by generating a second logic signal value if the difference has a second polarity.

REFERENCES:
patent: 3543172 (1970-11-01), Seppeler
patent: 5053717 (1991-10-01), Schulz et al.

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