Advertisements
Advertisements
Question
What is the role of a bandpass filter?
Advertisements
Solution
The bandpass filter blocks the signal which is d.c. or has frequencies ω, 2ωc and 2ωm and allows a particular band of the frequency signal to pass.
APPEARS IN
RELATED QUESTIONS
Define modulation and transducer
State three important factors showing the need for translating a low frequency signal into a high frequency wave before transmission
The carrier wave is given by
C(t) = 2sin(8πt) volt.
The modulating signal is a square wave as shown. Find modulation index.

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?
Why is Modulation index kept low?
In a communication system, what is meant by modulation?
A 20 volt AC is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 volt, the voltage across the coil is ______.
A 100 m long antenna is mounted on a 500 m tall building. The complex can become a transmission tower for waves with λ.
A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by this antenna would be ______.
A carrier wave Vc(t) = 160 sin(2π × 106t) volts is made to vary between Vmax = 200 V and Vmin = 120 V by a message signal Vm(t) = Am sin(2π × 103t) volts. The peak voltage Am of the modulating signal is ______.
