Fast acquisition ringing filter MSK demodulator

Details Fast acquisition ringing filter MSK demodulator Fast acquisition ringing filter MSK demodulator

1984-11-08

1986-11-11

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

329 50, 329112, 375 77, H04L 2714

Patent

active

046226834

ABSTRACT:
A clock and carrier recovery circuit, and a related method, for use in a minimum shift keying (MSK) receiver demodulator. The clock and carrier recovery circuit uses ringing filters to lock onto two frequency-doubled tone components of a received MSK signal. A signal having the same frequency as the clock is recovered by taking the difference of the outputs of the two filters. The output of each filter is then combined separately with a signal having a frequency to produce to signals, each having a frequency equal to twice the carrier frequency and having complementary amplitude modulation. These two signals are summed to cancel the amplitude modulation and the resulting sum signal, having constant amplitude and a frequency twice that of the carrier, is divided by two to recover the carrier signal.

REFERENCES:
patent: 4338579 (1982-07-01), Rhodes

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