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What is this IR-type-y board doing inside of my set-top-box?
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CherryDT:
Does anyone have a clue what this PCB is doing in my set-top-box (behind half-transparent plastic)? It features an FPGA, a shielded IR receiver and 4 LEDs (probably IR as well). - Note that there is another IR receiver elsewhere, next to the display, so I don't think this board is responsible for receiving remote control signals (and also why would it need LEDs then). 🤔



Thank you :)

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EDIT: The device is white-labelled and marketed as "A1 Mediabox Recorder" but it seems in reality it's a TLA-5720SWFX by Advanced Digital Broadcast (sorry I should have mentioned that from the start). I wasn't able to find much information about it online.

Also, some people got a weird alert about my website which hosts this image (the original link was this), so in case you trust Dropbox more, use this link: https://www.dropbox.com/s/tdznqb2uwg20cm9/2020-10-04%2019.06.46.jpg?dl=0
hexreader:
Wild guess only....

Is it for detecting gestures - like X-Box does?

Control your box just by moving your hands.


X box uses IR emitters like that, but the receiver is an IR sensitive camera, not IR receiver.
Benta:
Could be for viewer presence detection. Not commonly used in Europe, but very common in the US for the Nielsen ratings.
ConKbot:
Repeater so you can control your TV with the set top box remote without having to program the remote?  If you dump enough IR out forwards, the reflection/scattering on the far wall should be enough to signal the TV?
Benta:

--- Quote from: ConKbot on February 03, 2021, 09:30:27 pm ---Repeater so you can control your TV with the set top box remote without having to program the remote?  If you dump enough IR out forwards, the reflection/scattering on the far wall should be enough to signal the TV?

--- End quote ---

Why would that function need a receiver?

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