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IR Audio - compendiumarcana.com
http://www.compendiumarcana.com/iraudio/
This method works with IR carrier frequency of up to 40 kHz. Most remotes are 36 (RC5/6), 38 (NEC and many others) or 40 (Sony) kHz. The illustrations below depict a 40 kHz carrier. That is the maximum possible with 20 kHz bandwidth audio. 40 kHz IR carrier using 20 kHz audio A single cycle of a sine wave. 50 uS period at 20 kHz
IR Based Wireless Audio Transmitter and Receiver : 6 …
https://www.instructables.com/IR-Based-Wireless-Audio-Transmitter-and-Receiver/
The Audio signal will be transmitted through an IR LED from the transmitter circuit; the IR signals will be then received by a photodiode which will be placed on the receiver circuit. The audio signal thus received by the photodiode will be very weak and hence it will be amplified by an LM386 amplifier circuit and finally played on a speaker.
How to connect an IR receiver to an audio card
https://www.lirc.org/ir-audio.html
The basic idea is that the output of the IR module (somewhere in the range from 0 to ~3-4V) can be limited by using the attenuator built into every audio-card (also known as "mixer sliders"). For purists it could be done by connecting a diode so that it shunts any output voltages above ~0.6V (it is shown hashed on the schematics) but this is ...
AV / IR / Audio Cables — ChallengerCableSales
https://www.challengercable.com/av-cables
IR Cables & Audio Cables // We offer IR extension cables in various lengths and frequencies, as well as TOSLINK optical audio cables. Toslink IR Extender 3.5 mm
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