Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1996-04-04
1997-12-30
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
329341, 329343, 375324, 455214, H03D 300
Patent
active
057035270
ABSTRACT:
A frequency modulated signal demodulator circuit wherein an in-phase component (I) and an orthogonal component (Q) of a frequency modulated signal output from an orthogonal detector circuit are respectively delayed by one sampling time. The result (I.multidot.Qs) of multiplying the in-phase component (I) by a delayed orthogonal component (Qs) is subtracted from the result (Q.multidot.Is) of multiplying the orthogonal component (Q) by the delayed in-phase component (Is), and the subtraction result (d.theta.) is multiplied by an inverse (1/Ts) of the sampling time to derive an instantaneous angular frequency (d.theta./Ts), whereby the frequency modulated signal can be demodulated without any feedback loop which is required by conventional FM demodulator circuits, thus making it possible to avoid a deterioration demodulation characteristics due to the influence of phasing.
REFERENCES:
patent: 4090145 (1978-05-01), Webb
patent: 4755761 (1988-07-01), Ray, Jr.
patent: 5048058 (1991-09-01), Kaleh
patent: 5197085 (1993-03-01), Luff et al.
Grimm Siegfried H.
Maioli Jay H.
Sony Corporation
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