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its been more than a week and I would want to report my progress. I can record the 15kHz modulated signal very clearly however I could not been able to recover a single audio due to the fluctuating carrier frequency. Even if I able to, the signals was totally corrupted with only high frequency...

Initially I just wanted to do a simple setup without any modulation scheme, enhanced detectors or whatsoever. However from most of the answers I obtained from various sites they suggested to do modulation. (I not sure did they take a look at the links I provided in the main post, which is a...

Been using Red LED as sensors and they do provide some voltage however that would require optical setup which is a problem to me

Thanks for replying, actually I prefer to perform demodulation using software. The noise from solar panel itself is very terrible, which would mask all audible audio completely. I have tested the solar panel which under maximum ambient light exposure only produce 0.74V. In my final year project...

Ok thanks for reply, I did include RC filters before it goes in to sound card, will consider ur suggestion. Thanks for replying :)

Thanks for replying, I do understood the modulation does help us to isolate the signal content from background interference by mixing carrier frequency with content frequency. However if I use a carrier signal frequency of more than my computer sound card sampling rate of 44100Hz, I could not...

I have saw that few months ago but I dont understand why author perform PWM modulation at the receiving side ? Not on the transmitting side. Plus it using photodiodes as detector unlike mine, so I could not judge whether his setup is compatible with mine

Hi the audio source would be a speaker playing music behind a reflective surface (CD) attached to it. I doing it within 2 meters.

Hi everyone! I am currently working on a laser microphone project, inspired by this: Laser Microphone The diagram above is my entire setup. I am using a cheap 5mW red laser pointer (SYD1230, if that matters). The idea is to shoot the beam towards vibrating surface (due to sound) and capture...