Communication System Flashcards
1
Q
Define modulation?
A
Process of combining low frequency audio signal to high frequency carrier signal
2
Q
Necessity of Modulation?
A
- To transmit audio frequency to far distances
- To avoid mixing of different transmitters
3.reduce size of antenna
3
Q
Mention basic methods of modulation?
A
Amplitude, phase, frequency
4
Q
What type of communication is employed in mobiles?
A
Space wave
5
Q
What is www?
A
It is an encyclopedia of knowledge, accesible to everyone round the clock throughout the year
6
Q
Mention frequency range of speech signals?
A
300-3100 Hz
Bandwidth: 2800Hz
7
Q
What is sky wave propagation?
A
The communication between two long distant points on earth achieved by the reflection of radio waves in the ionosphere.
8
Q
What are basic blocks of communication system?
A
Transmitter
Medium
Receiver
