Rockbox Development > Feature Ideas
FS#10199 - Dynamic Range Compression
soap:
--- Quote from: nerdrunner on July 24, 2009, 01:34:36 AM ---7. If your ears are getting blasted by the earphones with such an algorithm, then you should probably leave the environment, because the earphones are only a few dB ahead of the background dB. When I'm riding on the subway and/or riding my bike in traffic, the earphones may well have to kick up pretty loud to still be understandable.
--- End quote ---
The appropriate response from a hearing protection point of view is to always be listening to the same, safe, volume level and to control the background noise be it though passive or active noise reduction. A few (3) dB over 80ish traffic noise is twice as damaging!
CCCMikey:
Dynamic Range Compression and Ambient noise-based volume adjusting are two rather different things.
Compression is (would be) most useful for those podcasts which are recorded raw and thus have the laughter much louder than the sick joke that caused it :) While this would be particularly useful for cars, etc, where there's a high amount of background noise so you end up getting deafened when someone laughs!
Ambient noise-based volume would also be useful in cars, etc but for a different purpose. Also, I wonder how many devices actually have micrphones out of the box.
Testing patches is currently out of my league at this stage I think, being a Windows guy.
Chronon:
CCCMikey, you can build just fine on Windows. You just need to set up a build environment as described in the docs index.
nerdrunner: I also don't like the idea of changing volume level according to sound pressure at a microphone. I sometimes use IEMs and the volume difference between sound out there and sound "in here" can be quite dramatic (20 to 35 dB). How is the algorithm supposed to know how loud to drive the phones when it doesn't know the actual sound pressure in my ear canal?
Blue Dude:
A stable patch is posted at FS#10199. I'm interested in feedback from users of all kinds of targets. Sansa E200 works great but I'd like to hear from everyone.
fredwbauer:
I just updated my Sansa Fuze to version 22895 and I saw the compressor option. It's GREAT. Thank you! Thank you! (Now I can hear the other half of my music over the road noise.) This really makes my Fuze more useful.
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