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aflint
Location: United Kingdom
Posts: 4
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 Posted - Fri Aug 08, 2003 5:11 pm
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Hello all,
Sorry for the cryptic Subject line, but I am still having problems converting what seem perfectly good .wav files to .mp3, using Cool Edit 2000.
I am recording 'voice' only, for putting onto a web site that only allows Mono .mp3 files that are 16 Kbps / with allowable sampling rates of either 11025, 16000 or 22050. I am creating an original .wav file, using a sampling rate of 44100, in stereo, 16-bit resolution. I then am converting to a Mono, using the sampling rate of 11025. for some reason this seems to give me the best result. Even so, I still have a problem.
Coming down from the 44100 Stereo .wav file I know that it will degrade when compressing to Mono .mp3 format at 16 Kbps. What I am getting however is what I will describe as a 'mirror image' of my voice in the background, it is as though I can hear myself twice. The background sound is somewhat lower in volume but clearly there.
I have tried various solutions, with sampling rates etc, but I just wondered whether anyone has any ideas that might help. One thought that someone suggested is that the problem may lie in the way that Cool Edit compresses the .wav file to .mp3. I know that is not a perfect way of putting it, but I don't know the technical jargon to describe the formula that Cool Edit uses.
Thoughts and suggestions anyone?
Regards,
Alan
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MusicConductor
Location: USA
Posts: 1524
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Posted - Sat Aug 09, 2003 10:21 pm
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Double bubble, toil and trouble...
Is there any place you can post a small example of this? It sounds like a bizarre problem. Giving us a listen can't hurt.
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jester700
Posts: 546
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Posted - Sun Aug 10, 2003 5:17 am
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You could try downloading the freeware CDEX program. It uses a different MP3 encoder (LAME - that's its name; it's actually very good) and seeing how that comes out. 16k is pretty durn low.
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MusicConductor
Location: USA
Posts: 1524
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Posted - Sun Aug 10, 2003 9:18 am
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By the way, 11025 will give you the best sound at such a low mp3 bitrate because the coding information is used more efficiently in the octaves that count the most. Conversely, coding at 16kbs from a 16KHz file requires that some of those precious bits be spent on the audio range from 5.5 to 8Khz, allocating fewer of them to the lower range.
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Double Trouble - wav to mp3