Endec
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A decoder is a device which does the reverse of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode.
An endec is a device which both encodes and decodes, either with the same or separate circuitry or algorithm. The combining of these names is a portmanteau.
The general difference between an endec and a codec is that hardware is usually considered to be an endec, while software is considered to be the codec. Similarly, the word "encoding" is usually used for hardware, while "coding" is usually used in regards to software.
A program (or hardware) which uses a compression algorithm to create MPEG audio and/or video is often called an encoder, and one which plays back such files is a decoder. However, this is technically a codec, especially if performed in software.
Examples of encoders, decoders, and endecs:
- a modem is an endec, likewise a modulator is an encoder and a demodulator is a decoder
- an Emergency Alert System unit is usually an endec, but sometimes just a decoder
- a stereo generator used in broadcasting is an encoder
Other things which are encoded or decoded: