Support and General Use > Audio Playback, Database and Playlists
Enabling 24bit-44.1/48/88.2/96khz playback - iAudio and others?
preglow:
--- Quote from: lazpete on October 17, 2007, 07:28:06 AM ---Did a resampling of the Joni Mitchell album Blue, to 16 bit 44.1 khz, in foobar and I agree . It is accualy better on the sansa now.
--- End quote ---
No surprises involved. If you have music files you know you're only going to be listening to on a current Rockbox, you should resample them to 44.1 kHz on a computer. Even if we do get a good resampler some day, the kind of resampling you can do offline on a computer will always be better, since we need to do our resampling realtime. I believe some of our targets do support 96 kHz playback in hardware though, so when we enable support for that, you might be interested in keeping them at the original sample rate. I kind of cringe every time I have to call our current deal a resampler at all. It's just a linear interpolator and is basically the the second worst resampler there is.
saratoga:
--- Quote from: pabouk on October 17, 2007, 04:19:15 AM ---I think that the quantization noise of the 12 bit recording will be easily noticeable and distinguishable from the ambient noise.
--- End quote ---
I don't if the ambient is much louder then 30dB, which it will in virtually all cases.
--- Quote from: pabouk on October 17, 2007, 04:19:15 AM --- Please do not mix quantization and ambient noise. They are very different things. The ambient noise is a part of the recording (EDIT: which is usually desired).
--- End quote ---
Of course, however, the ambient noise masks the quantization noise. In general, to hear quantization noise, it cannot be masked since properly dithered quant noise is not easy to pick out of other sounds (by design). This is the principle that mp3/ogg/etc are based on. Thats how you can listen to an mp3/ogg/DTS/AC3/AAC/whatever file with an SNR of just 30 or 40dB and not notice the (quite loud) quantization noise thats constantly blasting at you.
jaylee:
Many targets of RB are well designed, enable higher sample rate and bit depth may get better sound quality?
soap:
--- Quote from: jaylee on September 28, 2010, 06:37:22 AM ---Many targets of RB are well designed, enable higher sample rate and bit depth may get better sound quality?
--- End quote ---
As answered above:
Unlikely. Can you hear frequencies above 22 KHz? Can you hear noise 96 dB down in a mix?
The only reason you might hear a difference with native 48 playback is where Rockbox's 48->44 resampler is poorly performing. This could be addressed for the benefit of all.
jaylee:
--- Quote from: soap on September 28, 2010, 06:48:07 AM ---
Unlikely. Can you hear frequencies above 22 KHz? Can you hear noise 96 dB down in a mix?
The only reason you might hear a difference with native 48 playback is where Rockbox's 48->44 resampler is poorly performing. This could be addressed for the benefit of all.
--- End quote ---
emmmmm, you're justified in this. it seems the only meaningful thing for RB (and a DAP) is enabling 48khz playback.
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