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Distortion Problem on Sansa
saratoga:
--- Quote from: Vortex on June 04, 2007, 04:55:34 PM ---
--- Quote ---Can you provide a sample clip, maybe 3 or 4 seconds that very clearly shows this problem?
--- End quote ---
I have uploaded a sample clip at Mediafire.
Even though this is just a small snipplet and not the entire song I thought that it might still be best to put up a warning: This song might cause serious mental injury! ;)
Why did I still choose it? Well, you asked for a clip that very clearly shows the issue. Searching through the collection on my Sansa I couldn't find a better song to demonstrate this.
Anyway here it is:http://www.mediafire.com/?3mlvzw7mwhx
It's a zip archive that contains a snipplet of the original file, as well as a recording from the Sansa. I encoded both to FLAC to save space (that shouldn't be a problem since FLAC is lossless, I thought).
The recording was made using the Line-In of my Computer's soundcard (Creative Audigy2 Value).
I hope this helps...
--- End quote ---
That clip is peak normalized to 0 dB, so if it is encoded into any lossy format it will distort to some extent. You must use replaygain with it.
Llorean:
If the problem is in the vorbis decoder, rather than in the hardware drivers, it matters quite a bit that you've transcoded it...
Vortex:
--- Quote ---If the problem is in the vorbis decoder, rather than in the hardware drivers, it matters quite a bit that you've transcoded it...
--- End quote ---
The distortion occurs whether I play the transcoded FLAC or the Vorbis file, so I doubt it's the vorbis decoder's fault.
Nevertheless I have uploaded a non-transcoded snipplet (it was split with mp3splt, without re-encoding the file).
http://www.mediafire.com/?fsztcp8m92h
--- Quote ---That clip is peak normalized to 0 dB, so if it is encoded into any lossy format it will distort to some extent. You must use replaygain with it.
--- End quote ---
Can you explain that a bit, please? I don't know what you mean with "peak normalized" and I don't understand why I "must use replaygain". I don't have to use replaygain on my Computer to play the file distortion-free after all. ???
Chronon:
I think "peak normalized to 0 dB" means that the peak sample for the clip is scaled to correspond to a value of 0 dB. I have some theories as to the reasons that transcoding to lossy formats would cause clipping, but I'll let saratoga answer that as this is much more his area of expertise than mine.
saratoga:
--- Quote from: Vortex on June 04, 2007, 07:41:12 PM ---Can you explain that a bit, please? I don't know what you mean with "peak normalized" and I don't understand why I "must use replaygain". I don't have to use replaygain on my Computer to play the file distortion-free after all. ???
--- End quote ---
It means if you make the file even one interval louder, it will distort. Any lossy codec will add noise, which will push you into distortion.
This may not be what you're hearing, but you need to account for it first.
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