Modulating arrangement for phase and amplitude modulation of a wave
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United States of America Patent
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Oct 15, 1991
Grant Date -
N/A
app pub date -
Jul 19, 1989
filing date -
Jul 22, 1988
priority date (Note) -
Expired
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Abstract
An arrangement by which a sinusoidal wave is modulated in phase and amplitude in response to groups of bits includes an input (1) for receiving the groups of bits, a phase shifting circuit (5, 7) for producing two phase-shifted components of the wave and a modulating circuit for modulating the amplitude of the two components as a function of the groups. The modulating circuit includes a ROM (25), addressed by part of the n bits of the bit groups for producing an initial amplitude value, and a calculating unit (30) for obtaining final amplitude values by changing original values according to the remaining part of the bits of the bit groups.
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