Wav to Mp3 rumbling/clipping problem??

  • Thread starter Thread starter paradoxrock
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paradoxrock

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Hey,
I've searched all the threads and posts and can't find any solutions or suggestions.. I have WAV files that I want to convert to Mp3.. The Wav files play fine but as soon as I convert them to mp3 there's a rumbling static noise on the mp3 file.. what can I do to stop this.. I've tried different converters and they all have the same result. Again the recording itself is clean and the Wav file too.. it's just when it's an Mp3 file..
Anyone out there have similar problems?? If so please let me know..
Thanks..
 
Rumble

You might have actual sound in the upper and lower frequency range that works fine in WAV but MP3 is a lossy format that may be amplifying bad things when converting. There are more available frequencies in the WAV file and less in the MP3. This depends on how low you go on the MP3 bit rate too. I would suggest clipping unwanted frequencies at the upper and lower ends of the graph (use a multiband graph to do this) when mastering the WAV, then convert it to MP3 and see if it helps.
 
High Pass Filter at around 20 Hz and a Low Pass Filter around 18 KHz before you convert should reduce MP3 artifacts
 
Try a different converter. Some are better than others.
When converting the MP3 prog usually chops off the highs & lows to fit the assummed hearing range of the average listener as a 1st part in the conversion & "loss" to reduce the size of the file.
that said I did have a similar problem & it transpired taht I had a combination of a DC offset & some big, yet inaudible to me, ultra bass fundamental type stuff going on.
For those issues I cleared the DC offset using the option in wavrepair's Normalizer process. I also, after some sage advise, from southside glen I think, used a stereo high pass filter to remove below 50hz on the wav. file. This last worked particularly well as it addressed issues that arose as harmonics from the fundamental prob.
SOOO, check for DC offset - as that'll point out a problem in your gear or chain and then treat it with the high pass filter & see if that clears things up for you.
If you have a frequency spectrum analysis jobbie use that to see if the problem is visually obvious & it might clue you into where to set the filter.
Oh, most of the MP3s I've come across range from 30hz to 20 khz - so I've assumed that's the normal decapitations & debbummitation range.
Bon Chance!
 
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