Howtosignalprocessing
- What is modulation and demodulation?
- What is a modulation circuit?
- How modulation and demodulation is done?
- Why modulation and demodulation is important?
What is modulation and demodulation?
Modulation is the process of encoding information in a transmitted signal, while demodulation is the process of extracting information from the transmitted signal.
What is a modulation circuit?
A modulator is an electronic circuit that superimposes a low-frequency (information) signal onto a high-frequency (carrier) signal for the purpose of wireless transmission. The reason for this is that higher frequency signals can be received using shorter aerials, which are more practical than longer ones.
How modulation and demodulation is done?
– In a communication system modulation is done at the transmitter side. Whereas Demodulation is done at the receiver side of a communication system. – In modulation, the original message signal is mixed with a carrier wave whose parameters are required to be changed.
Why modulation and demodulation is important?
Modulation of signal is important to prevent mixing of message signals from different transmitters and makes it easier to tune to the desired signal. Without modulation, size of the antenna will become very large and it will make antenna size in order of km for message signal of kHz order.
