Recover Weak Modulated Signal

1. How do you recover a modulated signal?
2. How over modulated signal is recovered without any distortion?
3. Is it possible to recover the original message signal from the over modulated AM signal?
4. What effect does overmodulation have on the recovered message signal?

How do you recover a modulated signal?

The demodulation process recovers the original information (modulating signal) from the carrier signal. The process of demodulation is also called detection or discrimination, and the device constructed for demodulation can be called a demodulator, detector, or discriminator.

How over modulated signal is recovered without any distortion?

Over modulation is said to occur when the maximum level is exceeded. This would result in distortion, or maybe even equipment damage. We could make use of limiters as a way to prevent over modulation. Limiters also help in peak clipping.

Is it possible to recover the original message signal from the over modulated AM signal?

Yes, it is possible to recover the signal from a "over modulated" AM carrier, but not with something as simple as a envelope detector. Think about it. Fully "overmodulated AM" is double sideband. Clearly it is possible to recover the base signal, since it has been done.

What effect does overmodulation have on the recovered message signal?

Overmodulation results in spurious emissions by the modulated carrier, and distortion of the recovered modulating signal. This means that the envelope of the output waveform is distorted.