Decoder for a frequency-keyed signal, particularly an FSK-video

Details Decoder for a frequency-keyed signal, particularly an FSK-video Decoder for a frequency-keyed signal, particularly an FSK-video

1984-06-20

1987-03-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 76, 375 88, 375 97, 455260, 329122, 331 1A, 331 12, 331 17, H04L 2714

Patent

active

046495517

ABSTRACT:
Decoder for a frequency keyed signal, particularly an FSK videotext signal. To avoid isochronous distortions, precise matching of the decoder is necessary. Due to the provision of a additional AFC circuit (11) to regulate the natural frequency of the VCO (5) in the PLL loop (3-5) of the decoder, such matching is no longer required.

REFERENCES:
patent: 4100503 (1978-07-01), Lindsey et al.
patent: 4488120 (1984-12-01), Carsten

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