An amplitude modulated transmission the frequency which is not transmitted is
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In amplitude modulation the carrier wave amplitude is varied is varied linearly with the modulating wave (the base band signal) creating what is called the envelope signal. The envelope has the same shape as the base band signal provided that:
1. The carrier frequency fc must be much greater then the highest frequency components fm of the message signal m (t) i.e. fc >> fm
2. The modulation index must be less than unity. if the modulation index is greater than unity, the carrier wave becomes over modulated.
Once we don't have the envelope, or the envelope doesn't resemble the original baseband signal, the detection of the AM signal to restore the modulating wave m(t) can't be done with a simple envelope detector (a diode followed by a low pass filter- RC circuit). Detection may be done, however, using other AM types of the suppressed carrier types.
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