COMPUTER NETWORKING

Detailed explanation-1: -Pre-Emphasis: The pre-emphasis circuit only amplifies the high-frequency component without changing the low-frequency amplitude and by doing this it provides an extra noise immunity to the FM signal and the SNR of the FM signal gets improved.

Detailed explanation-2: -Pre-emphasis: The noise suppression ability of FM decreases with the increase in the frequencies. Thus increasing the relative strength or amplitude of the high frequency components of the message signal before modulation is termed as Pre-emphasis.

Detailed explanation-3: -Pre and de-emphasis circuits are used only in frequency modulation. Pre-emphasis is used at transmitter and de-emphasis at receiver. ), for higher modulating frequencies. This can be done by increasing the deviation ‘’ and ‘’ can be increased by increasing the amplitude of modulating signal at higher frequencies.

Detailed explanation-4: -Thus, if we boost the amplitude of higher frequency modulating signals artificially then it will be possible to improve the noise immunity at higher modulating frequencies. The artificial boosting of higher modulating frequencies is called Pre Emphasis.