What is the difference between analog modulation and digital modulation?

What is the difference between analog modulation and digital modulation?

The difference between analog and digital modulation is as follows: Analog modulation 1. In analog modulation ,the modulated (message) signal is continuous both in amplitude and time.

2. In this modulation, the transmission of data in analog format and output also analog in nature 3. In analog modulation, any value between maximum and minimum is valid.

4. Analog modulation is more preferable than digital in Case of transmission of data, a voice signal can directly transmitted through analog.

5. It is more sensitive to noise.

6. Implementation of analog modulation is cheaper.

7. It gives less accurate results.

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Digital modulation 1. In digital modulation, the modulated(message)signal is discrete both in time and amplitude 2. Transmission of the data in digital format in terms of 1’s and 0’s and output also digital in nature.

3. In digital modulation only 2 values, one value is 0 and another is 1 and remaining values are considered as noise and are rejected 4. In case of transmission of any signal digital modulation is less preferable. for example if you considered a voice signal, transmission of voice signal through digital modulation is very difficult first we need to pass it through an ADC(analog to digital converter ) at transmitter side and DAC(digital to analog converter) at receivers side to receive the original signal .

5. Less sensitive to noise , ease of multiplexing 6. Digital modulation implementation is costly than analog 7. It Produces more accurate output than analog.

Why is modulation used in communication?

The message signal frequency is raised in the modulation technique with respect to a range that is very useful for transmission. Let us see few points to describe the modulation’s significance in a communication system.

In signal transmission, the signals from various sources are transmitted with the common channel along with the usage of multiplexers. At a particular bandwidth if the signals are transmitted then they lead to interference. There are lots of career frequencies that are modulated by the speech signals to overcome the interference.

There is one more technical reason which is nothing but the antenna size which is inversely proportional to the radiated signal frequency. 1/10th of the signal wavelength is the order of the antenna aperture size. If the signal frequency is 5 kHz then the size is practicable. Thus it is significant to increase the frequency by the process of modulation that will actually decrease the antenna height.

It is very significant to transfer the signals for longer distances termed Modulation as it is not possible to send low-frequency signals for longer distances.

It is very significant to allocate lots of channels for users and to enhance the noise immunity Different Types of Modulation There are two types of modulation and they are analog and digital modulation techniques. The information of the baseband is converted into Radio Frequency signals in both the techniques but then in analog modulation, these RF communication signals are having a continuous range of values which is not the case in digital as it contains discrete states.

Analog Modulation The carrier wave in this signal is a continuously changing sine wave which in turn changes the data signal or message signal. This wave contains three general functions like amplitude, frequency, and phase.

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Source: quora