Demodulation is also called which two techniques?

Demodulation is also called which two techniques?

• A. Frequency detection and Phase detection
• B. Amplitude detection and Envelope detection
• C. Gain control and Rejection
• D. Compression and Demodulation

Answer: (B)

Demodulation of an amplitude-modulated signal relies on pulling out the information carried by the changing envelope, so it’s described as amplitude detection. In practice, envelope detection is a common way to do this: a diode detector followed by a filter tracks the envelope of the carrier, recovering the baseband signal. The other phrases don’t apply to AM demodulation. Detecting frequency or phase relates to demodulating FM or PM signals, not AM. Gain control, rejection, or compression aren’t demodulation methods for recovering the original audio or data from an AM carrier.

Demodulation of an amplitude-modulated signal relies on pulling out the information carried by the changing envelope, so it’s described as amplitude detection. In practice, envelope detection is a common way to do this: a diode detector followed by a filter tracks the envelope of the carrier, recovering the baseband signal.

The other phrases don’t apply to AM demodulation. Detecting frequency or phase relates to demodulating FM or PM signals, not AM. Gain control, rejection, or compression aren’t demodulation methods for recovering the original audio or data from an AM carrier.