Built-In Microphone picking up Buzzing Sound

So I record my lectures using the built-in microphone and I noticed that nearly most of the time, I hear this annoying buzzing sound when I playback my recordings. At first I thought it was the Microphone Boost because I had mine at about +36.0 dB but then I noticed that the buzzing sound would go away once in a while in the audio. I realized that during lectures, my LCD screen would shut off once in a while too (I set it so that it turns off the screen after two minutes).

So this lead me to believe that my LCD screen was the culprit behind the buzzing noise. From where I'm using the laptop, I don't hear any buzzing sound; even holding my ear up close to the screen, I don't hear a buzzing sound. Being that the microphone is right under the screen, I'm guessing that it's picking up something from the screen.

Is this something I should worry about? Is it normal to hear this buzzing sound when using the built-in microphone and any way to fix it other than manually turning off the screen?

Edit: It's more of a really high pitch sound, not buzzing.

 

It is something you should worry about. It causes bad sound and now when you have noticed it you can´t ignore it.

Laptops are filled with electronic gizmos, and probably many of them interfere with other gizmos. In regular computers some components/cards would be shielded, and the distance is longer between the components so whatever is causing interference does is to a much lower degree.

The on board audio chips are always and I mean always of the cheapest and worst kind you could imagine, even on Lenovos, its not a high priority thing I guess. If it was the headphone and mic in/out would have at least 1/4 connectors instead, those are always much much much more durable.

I have a brand new t400 and when I connect my phones with very high sensitivity (like 120dB) I hear massive distorsion as soon as any music is played, this is on volume setting 1 (of 25) in windows the headphone out is pretty much unusable with these phones, this distorsion (sounds like a bad fm-rip that has then been put on vinyl and is now being played back on really bad/inappropiate gear, with dust on it.

This is inaudible if I plug it to my main amplifier then plug another set of phones in that one, since that whole chain is a lot less sensitive.

I actually tested it with RightMark Audio Analyzer. Products. Audio Rightmark
(really easy to use audio measurement software) and I find no problem, I measure it with a much more exotic audio card so I know the results are pretty accurate, its on par with some onboard Realtek audio chips, except its not, at least not when listening to music..

You know what they say about flat screen tvs, you should never use them as a sound source, its the same with laptop onboard sound, it works in extreme emergencies.

I am getting either TerraTec - Products - Sound - External (USB / Firewire) - TerraTec Aureon Dual USB


or ESI - UGM96



They should be much better for everything, and no static/distorsion/buzzing.
Pretty much everything will be better than onboard sound/mic.

 

Wow that is actually a bit overboard for what I need to do lol. At least now I know something like this exist for future references. Thanks!

Oh and actually, all I needed was a $7.00 mini microphone that I just got today; no more high pitch noise and typing sound is not as bad.



Nothing compared to what you're using but not too bad so far.