The best replacement for ir emitter is ir receiver.

The best alternatives to ir emitter are rated as following:
★★★★★  ir receiver
★★  dlp link
★  ir blaster

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Speaking about ir emitter, one probably shouldn't forget about 3d glasses.

Other search terms related to ir emitter and their ratings are:
★★★★★ 3d glasses
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ir emitter
ir receiver
dlp link