we will start by giving some example like, function of any communication system, transmitting information from one location to another.
Speaking simply so, it seems a simple process ... but it is not!
To try to identify the many concepts and processes involved, let us consider a communication between two people.
If these people are close, one speaks and another listens.
From above example we observe some basic concept
1. information power
2. Transmission medium
3. Transmitter
Who speaks is the transmitter, and who is listening is the receiver.
If above people are far away, then the communication needs other means, such as a telephone line or a radio channel frequency.
Note that now we introduce new digital devices, besides other techniques to allow the original data - in this case the voice - is crafted so as to reach the other person.
The information coming out of the transmitter needs to be changed (modulated) to then be transmitted. At the receiver, must do the reverse process, or the demodulation of the information, converting the same to the original information.
More concepts ...
Modulation : changing the characteristics of the signal being transmitted.
Demodulation , the reverse process of modulation.
Our voice, as well as most of the sounds found in nature, is analog. Until there are purely analog transmitters, such as the transmission of AM and FM. But let us not worry about it, almost everything today is even digital.
Before our voice to be transmitted, it must be converted. For this, there are digital devices that convert analog voice through a process of sampling and quantization.
The analog signal is first sampled first, then quantified into levels. Each of these levels is then converted to a binary number.
Difference Between Sampling and Quantization
1. In digital signal processing, sampling is the process of breaking up a continuous signal to a discrete signal.
2.In digital signal processing, quantization is the process of mapping a larger set of values to a smaller set.
