Defination of encoder and electronic circuits of encoder！

Defination of encoder : An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another, for the purposes of standardization, speed, secrecy, security or compressions.
Electronic circuits of encoder:
A simple encoder assigns a binary code to an active input line.
Priority encoders establish the priority of competing inputs (such as interrupt requests) by outputting a binary code representing the highest-priority active input.
For producing n no. of output when there is 2^n no. of inputs.

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