Analog/digital circuit

Details Analog/digital circuit Analog/digital circuit

2011-08-02

2011-08-02

Torres, Juan A (Department: 2611)

Pulse or digital communications

Synchronizers

Reexamination Certificate

active

07991093

ABSTRACT:
A digital filter operates on the basis of a first clock having a first frequency. A stereo modulator operates on the basis of a second clock having a second frequency higher than the first frequency and being asynchronous. The stereo modulator performs a predetermined process on output data of the digital filter. A frequency modulator operates on the basis of a third clock having a third frequency whose origin is the same as that of the second clock, and performs frequency modulation on an output signal of the second digital computing unit. A sampling converter receives output data having the first frequency from the digital filter, converts a sampling frequency to data synchronized with the second clock, and outputs the obtained data to the stereo modulator.

REFERENCES:
patent: 4823390 (1989-04-01), Wittrock
patent: 6535719 (2003-03-01), Suzuki et al.
patent: 7224302 (2007-05-01), Dornbusch
patent: 2009/0002089 (2009-01-01), Karr
patent: 8-191232 (1996-07-01), None
patent: 8-256135 (1996-10-01), None
patent: 9-69729 (1997-03-01), None
patent: 9-312588 (1997-12-01), None
patent: 10-13370 (1998-01-01), None
“United States RBDS Standard” Publisher: National Radio Systems Commitee, U.S.A., Published Apr. 9, 1998.

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