Rockbox Development > Feature Ideas

Adjusting Volume via ambient noise on players with a mic

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saratoga:
I mean, are you sure they work the way you think they do?  If the microphone is 0.5 meters away in your pants, at 100 hz you're 0.9 radians away from your ears.  cos(2pi*100*t) - cos(2pi*100*t+.9) = 1.2 dB attenuation.  Even at 30 Hz, you're only at 7 dB.

And thats assuming free space.  In reality if the microphone is clipped to your body, you have shadowing and diffraction on top of phase error. 

Most likely if they provide any benefit at all, they're using a microphone built into the headphones. 

phr:
It's been some years since I looked at that thing but I remember a little box with a neckstrap, that headphones plugged into.  I opened it up and it was really cheap and crappy inside, PC board with a bunch of analog parts, nothing digital looking at all.  It's in my storage locker if I still have it, so I'll look for it next time I'm there.

Michael7:
My wife has just changed her car to a Honda Jazz which has this feature built in to the stereo, the faster you go the louder the music gets and it works quite well. I came onto this site with what I thought was a brilliant idea but I see the OP has beat me to it :o and as I see by the replies there are a few problems.

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