A reader pointed out that FIIO’s TAISHAN-D03K converter is an alternative solution to the converter that I recommend, below, from Monoprice. The Taishan-D03K converter currently costs about $31 from Amazon and comes bundled with a 6 foot TOSlink cable and the converter has a 3.5 mm stereo connector on it. The converter can also accept digital coax input. Thus, this converter has the same capabilities but has the built-in headphone jack so one less cable is needed. Since it comes bundled with a TOSlink cable, it is an all-in-one package for those people whose TVs have a TOSlink connector on it.
The converter and cables that I recommend work for most situations, but not all. Be sure to keep your receipts in case it doesn’t work so that you can return the products. There is no guarantee this will work in your situation. I don’t know the source of the problem in all of these situations, but I recently learned that the solution I describe below works if your TV audio output uses Pulse Code Modulation (PCM) audio signals. It will not work if your TV uses Dolby Surround Sound or another Digital Theatre Sound (DTS) format. If your TV uses Dolby or another DTS format then either turn it off or buy a converter that can handle the Dolby or DTS signals like this CE Compass digital audio decoder and converter which currently costs $42.
разобраться какой сигнал идет на выход. если долби, то второй, если нет, то первый.
это ответ 2014 года, может есть что-то более современное.
вот еще один:
https://www.amazon.com/Digital-Optical- ... B003XCHCLCт.е. конвртеры существуют, надо разобрться с сигналами.