1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Audio to infrared converter

  1. Jun 20, 2008 #1
    Although it "sounds" weird... it is possible:



    You can convert an audio file into an infrared signal which can control your TV set!

    But I've a couple of questions, don't know if this is the best place to ask them:
    - why can a phone with "symetrical audio output" (???) reproduce a 38000 HZ signal, knowing that any audio device can usually reproduce only up to 20000?
    - is it possibile to reproduce a 38000 Hz signal using a MONO audio output rather than a stereo one?
    I did some studies, and the result is "yes"... but when I do it, I don't ger results I waited!
    http://www.planetmobile.it/jumpjack/ir2audio.xls" [Broken]
    http://www.planetmobile.it/jumpjack/immagini/ledrem.JPG" [Broken]

    I think that the opposite parts of the audio wave get "summed up" when they're converted into light, thus doubling the output frequency. But actually I see only ONE led transimitting light. Why?!?
    Last edited by a moderator: May 3, 2017
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Audio to infrared converter
  1. Energy of Infrared Light (Replies: 24)

  2. Infrared Wavelength (Replies: 3)