Short, sharp noise from speakers when resuming from sleep

This doesn't happen all the time, but sometimes when I lift the lid on my MacBook and wake it up, I get this short, sharp 'SHHH' noise come from my speakers that lasts about a second or so just after the screen illuminates. It can sometimes happen a second time, but the sound is even quicker but quieter. I've never had a hardware fault or even a problem with OS X since I bought the machine (touches wood) but I'm simply curious.
Thanks for any pointers

I think the same thing is happening to me. I notice that sound when my computer is waking up from sleep and I try to change the volume. It happens for a brief millisecond but it's just a nuisance.
I tried resetting the SMC two different ways (the way listed in the article and the way Apple support told me over the phone). The way Apple told me (it's similar to the way in the article but it also involves holding down option + command + the P and R keys when turning on the computer again) works briefly - like once - and then the problem comes back.
Is this happening to anyone else?

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