What is modulation Why is it required to modulate a signal before transmission?

What is modulation Why is it required to modulate a signal before transmission?

The signals within 20 Hz to 20 kHz frequency range can travel only a few distances. To send the message signal, the length of the antenna should be a quarter wavelength of the used frequency. Thus, modulation is required to increase the frequency of the message signal and to enhance its strength to reach the receiver.

Why modulation is needed give reasons?

Modulation allows a number of benefits for communication. It allows us to transmit a signal over a range of frequencies called bandwidth of the channel. The modulated signals do not interfere with each other. Lower the frequency of a signal, larger is the antenna required to transmit that signal.

Why do we modulate a signal during transmission and demodulation during receiving?

Reasons for Modulation Modulation of signal is important to prevent mixing of message signals from different transmitters and makes it easier to tune to the desired signal. For reliable and effective communication over long distance i.e. minimizing the signal losses during transmission.

How does modulation help transmission?

Modulation is an extremely important process in the transmission of a signal. As the channel offers very high losses to low frequencies, transmitting a message signal directly decreases the range drastically. Hence, it is used to modulate a high frequency carrier wave and the modulated wave is transmitted.

Why modulation is necessary for long distance communication?

Amplitude modulation (AM) signals are easy to demodulate and the radio receivers can demodulate AM signals effortlessly. AM signals are used for long distance transmission since it is less complicated and is also economical.

How does modulation and demodulation work?

– In modulation, the original message signal is mixed with a carrier wave whose parameters are required to be changed. In demodulation, the combination of carrier and message signal are separated from each other, to have an original information signal.

What is the difference between modulation and demodulation processes?

Difference Between Modulation and Demodulation Modulation is the process of influencing data information on the carrier, while demodulation is the recovery of original information at the distant end of the carrier. A modem is an equipment that performs both modulation and demodulation.

Why 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. Many factors influence how faithfully the extracted information replicates the original input information.

Why do we modulate a signal for transmission?

We modulate a signal for transmission because baseband transmission has many limitations which can be overcome using modulation. It is explained below . In the process of modulation, the baseband signal is translated i.e., shifted from low frequency to high frequency.This frequency shift is proportional to the frequency of carrier.

What is the modulation of baseband signal?

In the process of modulation, the baseband signal is translated i.e., shifted from low frequency to high frequency.This frequency shift is proportional to the frequency of carrier. We modulate the signal for transmission because of the following advantages:

What are the types of modulation?

There are three types of Modulation: Message signals also known as baseband signals are the band of frequencies representing the original signal. This is the signal to be transmitted to the receiver. Frequency of such a signal is usually low.

How does the modulation process increase the range of communication?

The attenuation reduces with increase in frequency of the transmitted signal, and they travel longer distance . The modulation process increases the frequency of the signal to be transmitted . Therefore, it increases the range of communication.