Built in Mic picks up fan noise.

[IchBinMatt]

Hi, When I record my voice from my built in mic on my macbook pro I can hear the fans in the background. Shouldn't the mic filter that out?

I mean they are very very silent and I am not doing any extreme apps. Just browsing the web.

Example:
http://www.youtube.com/watch?v=Sz3Oeww8X2M

Any advice?

 

[surrealhope]

Are you also doing screen recording at the same time as browsing + audio recording? Screen recording by itself is a heavy task on the CPU, generating plenty heat inside and forcing fans to spin up. Don't believe me? Just compare the background noise between the beginning of the video vs. towards the end.

Next time you want to do something similar, just do your audio annotation work AFTER the video bit is done. Alternatively you can use some post-editing software to edit out the noise. No noise reduction solution is perfect, but most of them work great with voice + background hum.

 

[IchBinMatt]

Are you also doing screen recording at the same time as browsing + audio recording? Screen recording by itself is a heavy task on the CPU, generating plenty heat inside and forcing fans to spin up. Don't believe me? Just compare the background noise between the beginning of the video vs. towards the end.

Next time you want to do something similar, just do your audio annotation work AFTER the video bit is done. Alternatively you can use some post-editing software to edit out the noise. No noise reduction solution is perfect, but most of them work great with voice + background hum.

Alright. I tested it again while using IShowU, but the fans are sooooo silent it's nuts. It's like my mic has to be in the fans to pick up how quiet they are....lol

 

[surrealhope]

It's like my mic has to be in the fans

It is, sort of. The built-in mic is next to the left speaker I believe, and there's are fans on both sides of the back (relative to trackpad) of the MBP.

EDIT: