Digital amplitude modulator

Details Digital amplitude modulator Digital amplitude modulator

H - Electricity

03

C

332/87

H03C 1/00 (2006.01) H03F 3/217 (2006.01)

Patent

CA 1196396

- 54 - Abstract An amplitude modulator (10) is disclosed which generates an amplitude modulated carrier signal by selectively combining varying numbers of other carrier signals. A circuit (20) is included which provides plural carrier signals of like frequency and phase where the number of carrier signals being provided is dependent upon the level of an input signal. A combiner circuit (22) combines the plural carrier signals to thereby provide a combined signal which is the desired amplitude modulated carrier signal. In one embodiment (Fig. 3) the carrier signals which are combined are all equal in amplitude. In another embodiment (Fig.4) the amplitudes of some of the carrier signals are weighted in a binary progression. In yet another embodiment (Fig. 9) the carrier signals are all frequency modulated whereby the output signals has both a varying frequency and amplitude.

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