What is AM?
Amplitude Modulation is the done by modulating the Amplitude of an sinoid Carrier signal using the incoming signal.
The Carrier signal is a sinusoid with a fixed Frequency at least twice as high as the highest frequency occuring in the spectrum of the incoming signal. Usually a much higher frequency is choosen.
Amplitude Modulation schemes have been widely used in Analog Radio.
The output signal is the simple product of incoming signal and Carrier Signal.
|Carrier Signal in frequency domain (to be added)|
|Modulating Signal in frequency domain (to be added)|
|AM Signal in frequency domain (to be added)|
Special Kinds of AM
- DSSC, Double Sideband Supressed Carrier
- SSB, Single Side Band
- Residual Sideband Modulation (modulation used for analog TV applications)
- QAM, Quadrature Amplitude Modulation