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Do LCD monitors emit high audio frequency noise?

I held my ear up to an ultrasound probe today and heard a high pitch noise. I am trying to deduce it's source. Someone told me it could be the LCD monitor generating the tone and the energy hopping ...
9
votes
1answer
4k views

Why does my LCD screen emit sound when displaying black-and-white lines?

I recently discovered this page (epilepsy warning; flashing lights), which displays horizontal black and white lines and animates their thickness. Amazingly, it makes my laptop LCD screen emit an ...
0
votes
1answer
82 views

Measure/Access Information from small device through audio jack (mic)? [closed]

I've got a small device that I have not yet opened. It sends some unknown sequence of voltage and current through a medium for a few seconds thereby calulating and then displaying a result value on a ...
18
votes
9answers
6k views

DSP recommendation for beginners [closed]

I am considering a project involving a fair share of digital signal processing. As far as I know, the best type of IC suited for this are the Digital Signal Processors. I have never worked with them ...