Circuit for rapid recognition of FSK signals in a radio channel

Details Circuit for rapid recognition of FSK signals in a radio channel Circuit for rapid recognition of FSK signals in a radio channel

1982-05-17

1984-05-08

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375103, 455266, H03K 906

Patent

active

044479093

ABSTRACT:
A circuit arrangement provides that false lock-in of the phase locked loop caused due to noise in a radio channel given pre-emphasis and de-emphasis is avoided and short transfer times can be obtained between the individual channels. To this end, a full-wave rectifier has a following transfer switch connected to a frequency shift keying demodulator having a phase locked loop. A high-pass filter is connected as a compensation filter in one branch and the incoming frequency shift keyed signal is directly connected to the demodulator over a second branch after it has been recognized.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4254504 (1981-03-01), Lewis et al.
patent: 4352208 (1982-09-01), Schroeder
patent: 4356567 (1982-10-01), Eguchi et al.

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