FM - Pre emphasis
Q. Pre emphasis is done- Published on 14 Oct 15a. For boosting of modulating signal voltage
b. For modulating signals at higher frequencies
c. In FM before modulation
d. All of the above
ANSWER: All of the above
Pre-emphasis is done for boosting the relative amplitudes of the modulating voltages at higher audio frequencies. In this method, the artificial emphasis of high frequency components of message signal is done before modulation in the transmitter. This is done because the noise is louder at higher frequencies. So pre emphasis is done before the noise is added in the communication channel.
