Quality of conversion CD --> MP3

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mr.Les

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Recently, I decided to post my first music on a site, but all my recording work using a Fostex VF-80 has been saved on regular audio CD's. Although I could re-record it from the Fostex as a MP3 save option ( I think), I decided to get a program to convert the existing audio file. For reference, this was a 4.5 minute stereo recording and required almost 48 Megs of storage.

I found a freeware well reviewed on the net and downloaded it. The program is called the dbPowerAmp Music Converter. For free, you can convert between CD Audio <---> MP3. They also support another file format. For an upgrade fee, you can get many other file formats. Any way, it downloaded and installed on my PC with no problems and was simple to use. You just locate an audio file with explorer, put the mouse over the name, and right click to select convert.

Then the surprises began. In the options area you have an option to select something called frequency. I suspect this is like sampling rate, or whatever. Anyway, lower freq. makes smaller files, higher freq. makes larger files.

To listen, I was just plugging in a pair of modest quality RCA head phones into my PC. They sound pretty good with the portable RCA CD player.

When I played back the MP3 files of the two lowest frequency sounded terrible. Strange sounds, almost like a feedback, which were not on the original CD. OK, my CD may have some strange sounds, but those are not what we are discussing. The low quality file was about 1 Meg. A medium quality conversion sounded much better and produced a 2 Meg file. A higher quality conversion produced a 6 meg file. It sounded a little better.

I wonder if this distortion is normal for the lower quality conversions, or folks have had differing experiences? Perhaps this explains some of the poor sound people report recording their guitars direct on PC's if they are going direct to a MP3 file? I read variations of this all the time on the boards.

Is 2 megs too big for a posted MP3?

I will post mine shortly, as the site is not quite finished.

Appreciate any comments.
 
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Hey mr. Les...to me an MP3 at 128 kbps (kilobites per second?) sounds pretty good compared with the WAV file from which it was converted)...With 128 kbps each minute = approximately 1 MB (4 minute song is 4 MB)

I have heard some MP3's at 96 kbps that sounded okay but it gets quite noticable to me when the kbps get any lower.

I use Cakewalk Pyro 2004 to do my conversions from WAV (the same kind of file that is on CD) and it gives 8 choices for kbps (64, 80, 96, 128, 160, 192, 256, 320) when you create an MP3 file.

A 6 MB MP3 of a 4.5 minute song should sound pretty close to your original WAV file...maybe you should try another WAV <---> MP3 converter ... I am pretty sure I have seen several free programs (beside the one you are using) posted on this site before (I think the latest version of Pyro is around $30 to $50)
 
dbPoweramp is a great converter.

You need to encode it with the "CBR" option selected at a bitrate of at least 160kbps in order for the top end not to totally suck like it does on all mp3's converted at 128. At that rate, a 4.5 minute tune will be about 5MB. You can't upload mp3's to this site...you need some kind of a host site like www.nowhereradio.com which allows you to store up to 15mb worth of tunes for free (about 3 songs, usually).
 
Anything below 192k for MP3 is just pointless in my opinion. I have listened to alot of different quality of MP3s and only a few sound decent. The high and low end on poor MP3s are really bad. The bass seems only half there in cases, and the cymbals sound like they are phasing!
MP3s at 320k (i think it is 320, might be 356 or so) are pretty good and i would find it a challenge to spot the difference between one of these and the original wave or .cda file.
The lower the k then the less samples are taken a second, so the gaps where there is no sample taken are pretty far apart and you can hear this with a jitery unconsistent sound rather than smooth flowing sound.
 
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