Demodulating AM signal from carrier signal on Matlab

1. How to demodulate an AM signal in Matlab?
2. How do you demodulate an AM signal?
3. How the carrier is removed at the output in demodulation?

How to demodulate an AM signal in Matlab?

z = amdemod( y , Fc , Fs ) returns a demodulated signal z , given the input amplitude modulated (AM) signal y , where the carrier signal has frequency Fc . The carrier signal and y have sampling frequency Fs .

How do you demodulate an AM signal?

An AM radio signal can be demodulated by rectifying it to remove one side of the carrier, and then filtering to remove the radio-frequency component, leaving only the modulating audio component. This is equivalent to peak detection with a suitably long time constant.

How the carrier is removed at the output in demodulation?

It is essential that the phase of the carrier and added signal are locked in. This results in shifting the spectrum of the modulation signal (autocorrelation function) to its original position on the frequency axis. The signal is then low pass filtered to remove the carrier signal (see Figure 6.4C).