Rockbox Development > Feature Ideas
FS#10199 - Dynamic Range Compression
oayz:
--- Quote from: Blue Dude on May 11, 2009, 11:33:21 AM ---I decided to go with a user selectable preamp setting vs. and OFF,MIN,MED,MAX scheme. Amplification is selectable from 0 to +20dB, with 0 disabling the feature. Comments are welcome, especially if you spot potential problems or bugs.
--- End quote ---
I believe there are more parameters than preamp gain: attack/decay times, noise come to mind. Having a few presets may be a better option than giving an user full programmability.
Blue Dude:
I decided to hard code attack/delay times to a reasonable compromise. I'm ignoring noise as a programmable component. I wanted to leave the preamp level user selectable at least long enough to figure out if it's necessary. For instance, I've got it set now for .5 dB increments. That's likely too granular, maybe 1.5 or even 3 would be better? That's getting close to the opaque Min, Med, Max scenario.
hoyo:
i can give you an other reason why we need this feature !!!
i often hear radio dramas with H340@rockbox on boring car rides.
But, this radio dramas are recorded for quiet rooms.
There you have loud voices and quiet noises and susurrus.
If you want to understand what they whisper you pump up the Volume and if then someone screams in the drama your ears get busted. :'(
On my home receiver is an feature called midnight mode which compressed the range hard.
On professional studio equipment you have also compressors on the microphone's from the singers.
It's an usual feature.
AFAIK at transformation from ac3 to mp3 DRC is used. Maybee you can find there some Information's how they work. --> besweet
CCCMikey:
I too am hanging out for this.
The Palm TX did it well, but has died.
Now, rather than using the iPod I have to use a 10 year old Toshiba laptop with FooBar for playing the poddies in the car.
As an example, Merrick and Rosso podcasts have 'wipes' (sound effects between show segments) that can be twice as loud as their voices. Radio station transmitters automatically level this out but podcasts tend to have the full dynamic range - hence it's deafening.
ABC's Thank God It's Friday is a live presentation and has full dynamic range so audience cheering is much louder than the presenter telling his 'the news from nowhere.'
I guess the only other solution is to remaster the poddies before loading them into the iPod.
Chronon:
Those of you interested in this feature, why not try out the patch and offer some feedback? http://www.rockbox.org/tracker/task/10199
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