Digital frequency modulation system in which high and low freque

Details Digital frequency modulation system in which high and low freque Digital frequency modulation system in which high and low freque

1990-11-08

1991-10-15

Grimm, Siegfried H.

Modulators

Frequency modulator

Plural modulation

332123, 358330, 358 23, 360 30, 375 44, 455 43, 455110, H03C 300, H04N 592

Patent

active

050577964

ABSTRACT:
In a frequency modulation system, a modulating signal is split into its low-frequency and high-frequency components. The low frequency component is used to modulate a carrier signal by conventional means in a first circuit and the low- and high-frequency components are used to narrowband modulate the carrier signal in a second circuit. The outputs of the first and second circuits are combined to provide a frequency modulated signal. The modulating and carrier signals can be binary-coded signals.

REFERENCES:
patent: 3654450 (1972-04-01), Webb
patent: 3778718 (1973-12-01), Bass et al.
patent: 3868599 (1975-02-01), Hirasaki et al.
patent: 4802016 (1989-01-01), Kaneko
Digitale Signalverarbeitung; Elektronik; Printed in Germany, 1984 pp. 97-100.

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