Telecommunications – Transmitter – Frequency conversion
Reexamination Certificate
2006-05-09
2006-05-09
Nguyen, Duc M. (Department: 2685)
Telecommunications
Transmitter
Frequency conversion
C455S102000, C455S313000, C455S196100, C455S255000, C348S554000, C348S726000, C348S729000, C725S151000
Reexamination Certificate
active
07043211
ABSTRACT:
A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a first frequency synthesizer and a second frequency synthesizer. The summing amplifier has a first input for receiving a video signal, a second input for receiving a first audio signal, a third input for receiving a second audio signal, and an output for outputting a modulated summed signal. The first frequency synthesizer generates a first frequency for mixing with the modulated summed signal to generate a high intermediate frequency (HI-IF) signal. The second frequency synthesizer generates a second frequency for mixing with said HI-IF signal to generate a desired RF output signal.
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Patel Dipakkumar R.
Waight Matthew G.
Driscoll Benjamin D.
General Instrument Corporation
Nguyen Duc M.
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