Direct modulation FM data receiver

Details Direct modulation FM data receiver Direct modulation FM data receiver

1982-10-20

1985-06-11

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329122, 375 97, 455208, 455324, H03D 313

Patent

active

045233241

ABSTRACT:
A direct modulation FM data receiver including a mixer (14) having a first input for receiving a directly modulated FM signal (f.sub.c .+-..DELTA.f), where .DELTA.f is the deviation and f.sub.c the carrier, and a second input for a local oscillator (20) signal (f.sub.L) having a frequency within the signal channel but offset from the input signal carrier (f.sub.c) by an amount (.delta.f). Demodulating circuits (22 to 30) distinguish between the signalling tones (.DELTA.f+.delta.f) and (.DELTA.f-.delta.f) and derive a data output signal therefrom.

REFERENCES:
patent: 2715677 (1955-08-01), Turner
patent: 2881319 (1959-04-01), Sills
patent: 2993958 (1961-07-01), Barnes
patent: 3286256 (1966-11-01), Covill
patent: 4339823 (1982-07-01), Predina et al.
patent: 4355407 (1982-10-01), Mueller

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