Encoder may refer to:

Electronic circuits

• Audio encoder, converts digital audio to analog audio signals
• Video encoder, converts digital video to analog video signals
• Simple encoder, assigns a binary code to an active input line
• Priority encoder, outputs a binary code representing the highest-priority active input
• 8b/10b encoder, creates DC balance on a communication transmission line

Media compression

• Compressor, encodes data (e.g., audio/video/images) into a smaller form (see codec)

Sensors

• Encoder (position)
  • Rotary encoder, converts rotary position to electronic signals
  • Linear encoder, converts linear position to electronic signals
  • Absolute encoder, outputs the absolute position
  • Incremental encoder, converts position changes to electronic signals in real time
• Altitude encoder