Digital Techniques and Applications - PART 8

07:29:00 Nandan Bhalwankar 0 Comments

g) Encoder

An encoder is a device or a circuit, a 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.

 

The above figure shows 8:3 Encoder. The Encoder above has 8 inputs and 3 outputs.

Examples of commonly used Encoder:

1) A compressor encodes data (e.g., audio/video/images) into a smaller form

2) An audio encoder converts digital audio to analog audio signals

3) A video encoder converts digital video to analog video signals

4) A multiplexer combines multiple inputs into one output

h) Decoder

Decoder is a digital circuit that converts ‘n’ bit binary input code to ‘m’ output lines. Here, each output line will be activated for only one of possible combination of input.

 

There are 2^N possible codes to achieve this. Depending upon these combinations or codes, one of ‘M’ lines will be activated. All other lines will be deactivated. Active logic can be low or high depending upon the chip.