The best replacement for decoder is encoder.

The best alternatives to decoder are rated as following:
★★★★★  encoder
★★  demultiplexer
★★  digital decoder
★  multiplexer
★  decrypter
★  demux
★  sw decoder
  an mp3 encoder
  descrambler
  codec
  s\/w decoder
  mux

Your alternative for decoder is not listed? Suggest!
Speaking about decoder, one probably shouldn't forget about seven segment display.

Other search terms related to decoder and their ratings are:
★★★★★ seven segment display
★★★ seven segment
windows media player
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decoder
encoder
demultiplexer