Message Signals And Their Band Width

The message signal

If f_(c) and f_(m) are the frequencies of carrier wave and signal, then the band width is

If 2f_(c) and 3f_(m) are the frequencies of carrier wave and signal, then the band width is

A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%.

In amplitude modulation, the message signal V_(m)(t)=10sin(2pixx10^(5)t) volts and Carrier signal V_(C )(t)=20sin(2pixx10^(7)t) volts The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is alpha KHz. The value of alpha is

A carrier wave of peak voltage 12 V is used to transmit a message signal . The peak voltage of the modulating signal in order to have a modulation index of 75 % is

Assertion : FM broadcast is preferred over AM broadcast . Reason : Process of combining the message signals with carrier wave is called demodulation .