Transmitting circuit apparatus and method
First Claim
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1. A transmitting circuit apparatus comprising:
- a frequency modulator that performs frequency modulation of a carrier wave with frequency modulation data and outputs the frequency-modulated carrier wave;
a sigma-delta modulator which performs sigma delta modulation of amplitude modulation data; and
an amplitude modulator that performs amplitude modulation of the frequency-modulated carrier wave with an output signal of the sigma-delta modulator and outputs the amplitude-modulated carrier wave.
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Abstract
A transmitting circuit apparatus has
a frequency modulator that performs frequency modulation of a carrier wave with frequency modulation data and outputs the frequency-modulated carrier wave;
a sigma-delta modulator which performs sigma delta modulation of amplitude modulation data; and
an amplitude modulator that performs amplitude modulation of the frequency-modulated carrier wave with an output signal of the sigma-delta modulator and outputs the amplitude-modulated carrier wave.
23 Citations
12 Claims
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1. A transmitting circuit apparatus comprising:
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a frequency modulator that performs frequency modulation of a carrier wave with frequency modulation data and outputs the frequency-modulated carrier wave;
a sigma-delta modulator which performs sigma delta modulation of amplitude modulation data; and
an amplitude modulator that performs amplitude modulation of the frequency-modulated carrier wave with an output signal of the sigma-delta modulator and outputs the amplitude-modulated carrier wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification