Encoder, Mux, Decoder and Demux

What is difference between a multiplexer and encoder? also What is the between demultiplexer and decoder?

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tariqgptcl

  • Dec 12th, 2010
 

MULTIPLEXER: The device which chooses the input channels. It has several
input channels but the output signal from all these channels is sent to one
single output channel.


DE-MULTIPLEXER: The device which is chooses the output channels. It has a
single input channel but outputs the signal from this single channel to several
output channels (one channel at a time)


Decoders are essentially DeMUXes. However, encoders are not essentially MUXes.
Roughly speaking, decoders convert from binary to unary, while encoders convert
from unary to binary.


Encoding:
The way in which the computer data is represented is known as encoding, there
are several encoding techniques (Unipolar, Bipolar and Biphase).
Creating a video file in a special format (e.g. DivX, MPEG-2, MPEG-4, ...) -
You´ll need a DivX Encoder in order to be able to create DivX files and a MPEG-2
Encoder in order to be able to create MPEG-2 videos.
Opening/playing/reading/watching a file (Decoding) and making a file (Encoding)


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