Demodulators – Frequency modulation demodulator – Input signal converted to and processed in pulse form
Patent
1996-03-26
1997-03-25
Mis, David
Demodulators
Frequency modulation demodulator
Input signal converted to and processed in pulse form
329317, 329343, 329347, 455337, H03D 100, H03D 300, H03D 500
Patent
active
056148623
ABSTRACT:
A DMUX 11 outputs data in a digital FM signal in a circulation to produce signals S1 to S4. An MUX 14 alternately outputs inverted signals of the signals S1 and S3, obtaining a signal Si.sub.(k). An MUX 15 alternately outputs inverted signals of the signals S2 and S4, obtaining a signal Sq.sub.(k). An interpolation circuit 17 inserts data having a value of zero between individual data in the output signal of the MUX 14, and cuts off the high-frequency component of the resultant signal, obtaining a signal Si.sub.(i). A second interpolation circuit 19 inserts data having a value of zero between individual data in the output signal of the MUX 15, and cuts off the high-frequency component of the resultant signal, obtaining a signal Sq.sub.(i). An arithmetic operation circuit 2 computes SI.sub.(i-1) .multidot.SQ.sub.(i) -SI.sub.(i) .multidot.Sq.sub.(i-1), and integrates it to obtain a digital demodulated signal.
REFERENCES:
patent: 4528511 (1985-07-01), Smith
patent: 4755761 (1988-07-01), Ray, Jr.
patent: 4779054 (1988-10-01), Monteleone et al.
Icom Incorporated
Mis David
LandOfFree
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