Audio signals transferred by a light source

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Discussion Overview

The discussion revolves around the feasibility of transmitting audio signals using different light sources, specifically comparing laser pointers, incandescent light bulbs, and LEDs. Participants explore the implications of using these light sources in terms of signal quality and volume based on distance from the receiver.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the possibility of using an ordinary light bulb for audio signal transmission, referencing a project involving laser pointers.
  • Another participant notes that while incandescent bulbs have a slow response time that may hinder the transmission of higher frequency sounds, they acknowledge that it is still possible to transmit audio signals using them.
  • There is a suggestion that LEDs could also be used effectively for this purpose.
  • A participant questions whether the distance between the light source and the receiver would affect the volume of the audio output, leading to further clarification on the impact of distance based on the type of light source used.
  • It is discussed that with a true laser, distance should not affect volume due to constant luminosity, whereas with incandescent bulbs or LEDs, distance would indeed affect the volume.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of various light sources for audio transmission, particularly regarding the impact of distance on volume. There is no consensus on the best approach or the extent of the limitations posed by different light sources.

Contextual Notes

The discussion includes assumptions about the response times of different light sources and their ability to transmit audio frequencies, which may not be fully explored or defined.

Who May Find This Useful

Individuals interested in experimental audio transmission methods, light-based communication technologies, or those working on related science projects may find this discussion relevant.

cynricng
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Hi, I am currently working on a little science project, I came across this page about sending audio signals through a laser pointer.

http://www.i-hacked.com/content/view/162/44/

I was wondering if it is possible if I did it with an ordinary light bulb.

It said that the data is transferred by the light's amplitude, so if I were to use a light bulb instead of a laser point, does it kind of mess up the signal if I were to stand closer or farther from the receiver? Or does the audio output on the receiver will just have a lower volume if I stand farther away?

Thanks.
 
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The problem with an incandescent light bulb is that it's response time is slow and may not accurately transmit higher frequency sound waves, But it's not impossible. I remember seeing a project for what you are describing using light bulbs when I was a kid. You could also do it with LEDs.
 
LEDs would seem to be the closest thing I have in mind.

But will the distance of the light and the receiver change the volume?
 
No, The distance shouldn't affect the volume (provided the device you are using is dependent upon luminosity for volume) if you have a true laser... because the luminosity would be relatively constant... no diffusion, but if you are using an incandescent bulb or LED then yes distance will affect the volume.
 
Oooh, i get it.

That's exactly the effect that I was hoping for.

Thanks.
 

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