Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-05-29
2007-05-29
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C455S130000
Reexamination Certificate
active
11209948
ABSTRACT:
A PM/FM modulator (100) includes an analog-to-digital converter (110) having an input terminal for receiving an analog input signal, and an output terminal, and a direct digital frequency synthesizer (120) having an input terminal coupled to the output terminal of the analog-to-digital converter, and an output terminal for providing a modulated output signal. In one form, an FM stereo modulator (200) includes a digital stereo modulator (210) and a direct digital frequency synthesizer (250). The digital stereo modulator (210) has a first input terminal for receiving a right analog input signal, a second input terminal for receiving a left analog input signal, and an output terminal for providing a digital signal having a stereo spectrum. The direct digital frequency synthesizer (250) has an input terminal coupled to the output terminal of the digital stereo modulator (210), and an output terminal for providing a modulated output signal.
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“Digital Frequency Synthesis Demystified,” Bar-Giora Goldberg, no date.
Jean-Pierre Peguy
Larson Newman Abel Polansky & White LLP
Silicon Laboratories Inc.
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