Table of Contents
What is modulation why it is needed?
Modulation allows us to send a signal over a bandpass frequency range. Another reason to modulate a signal is to allow the use of a smaller antenna. A baseband (low frequency) signal would need a huge antenna because in order to be efficient, the antenna needs to be about 1/10th the length of the wavelength.
What are the benefits of modulation?
Advantages of Modulation
- Antenna size gets reduced.
- No signal mixing occurs.
- Communication range increases.
- Multiplexing of signals occur.
- Adjustments in the bandwidth is allowed.
- Reception quality improves.
Why do we need modulation and de modulation?
At the broadcasting station, modulation is done to transmit the audio signal over larger distances to a receiver. When the modulated wave is picked up by the radio receiver, it is necessary to recover the audio signal from it. This process is accomplished in the radio receiver and is called demodulation.
What is the concept of modulation?
Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform — constant height, or amplitude, and frequency.
What are the advantages and disadvantages of modulation?
Advantages and Disadvantages of Frequency Modulation
| Advantages | Disadvantages |
|---|---|
| Less interference and noise. | Equipment cost is higher. Has a large bandwidth. |
| Power Consumption is less as compared to AM. | More complicated receiver and transmitter |
What are the function of demodulator?
A demodulator is an electronic circuit that is mainly used to recover the information content from the modulated carrier wave. There are different types of modulation and so are demodulators. The output signal via a demodulator may describe the sound, images, or binary data.
What is modulation and types?
Modulation is the process of converting data into electrical signals optimized for transmission. Modulation techniques are roughly divided into four types: Analog modulation, Digital modulation, Pulse modulation , and Spread spectrum method.
Why is FM better than AM?
FM uses a higher frequency range and a bigger bandwidth than AM. Each FM station is allocated 150 kHz of bandwidth, which is 15 times that of an AM station. This means that an FM station can transmit 15 times as much information as an AM station and explains why music sounds so much better on FM.
What is modulation and why modulation is required?
Modulation is a process by which some characteristic (amplitude/frequency/phase) of a high frequency carrier wave is varied, in accordance with the instantaneous value of the message signal (modulating signal/ baseband signal). Now let’s write down the benefits of modulation. We will discuss each point in detail one by one-
How is modulation used in long distance communication?
Modulation is used for long distance communication. In modulation we use high frequency carrier wave for transmission of the message signal. High frequency signals attenuate less as compared to low frequency signals. Therefore moderation is beneficial for long distance communication.
What happens to the carrier signal after modulation?
According to the definition of Modulation, some characteristic of the carrier signal is varied in accordance with the modulating signal. After modulation any one of the three parameters of the carrier signal, namely, frequency, or phase, is varied keeping the remaining two constant.
Why do we need modulation in a PCM?
The range is improved also with modulation, indirectly less power is necessary. For PCM (pulse code modulation) you can transmit data over a serial and digitised flow. PWM (pulse width modulation) is used to have an on-off signal proportional to a desired average voltage to control something.