ABSTRACT
Modulation is the name given to the process of
changing a particular property of the carrier wave
in sympathy with the instantaneous voltage (or
current) signal.
The most commonly used methods of
modulation are amplitude modulation (AM) and
frequency modulation (FM). In the former case,
the carrier amplitude (its peak voltage) varies
according to the voltage, at any instant, of the
modulating signal. In the latter case, the carrier
frequency is varied in accordance with the
voltage, at any instant, of the modulating signal.
