Subject : Principle of Communication Engineering

Topic : Angle modulation and demodulation

Difficulty : Medium

Pre-emphasis:

1. The noise suppression ability of FM decreases with the increase in the frequencies.

   2. Thus increasing the relative strength or amplitude of the high frequency components of the message signal before modulation is termed as Pre-emphasis. The Fig3 below shows the circuit of pre-emphasis.

De-emphasis: In the de-emphasis circuit, …