DC frequency modulation circuit using two phase locked loops

Details DC frequency modulation circuit using two phase locked loops DC frequency modulation circuit using two phase locked loops

1996-10-07

1998-03-31

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 2, 331 23, 455113, 455119, H03C 308, H03C 309, H03L 722

Patent

active

057343020

ABSTRACT:
A DC frequency modulation circuit for modulating audio signals wherein the high frequencies of the audio signals are modulated by a first phase locked loop and the low frequencies of the audio signals, along with the DC signals, are filtered by a low pass filter, applied through an A/D converter, and modulated by a direct digital frequency synthesizer. The two modulated signals are then mixed by a second phase locked loop.

REFERENCES:
patent: 3622913 (1971-11-01), Shipley
patent: 4512353 (1985-04-01), Chaplik et al.
patent: 4682124 (1987-07-01), Schutz

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