What causes squelch sounds in mp3 files?

[dima]

Hello
My portable mp3 player Panasonic SL-SV570 plays mp3 files with squelch sounds. Windows XP SP2 plays the mp3 files without the sounds. Could "Voice" Quality Preset cause the squelch sounds? Could the sounds be caused by RealAudio to mp3 convertion?

[Spoon]

All you have mentioned could be the problem, try a better preset, or if it is just voice enable dbpoweramps professional frequency conversion (if changing frequencies).

[dima]

Originally Posted by Spoon

All you have mentioned could be the problem, try a better preset, or if it is just voice enable dbpoweramps professional frequency conversion (if changing frequencies).

What is the "dbpoweramps professional frequency conversion"?
Deselecting "Voice" Quality Preset did not remove the squelch sounds.

[xoas]

What is the "dbpoweramps professional frequency conversion"?

Professional Frequency Conversion will be only of interest to those who convert between frequencies, most people will record a CD at 44KHz and create a 44KHz mp3 file, so it is not used. For those that convert files to different frequencies, this option can be switched on to use the clever code from Naoki Shibata (released under LGPL) to give much better sounding files (but slower conversions).

The information above is in your dMC Help files. When you select the voice preset you are creating a file which is encoded at a lower frequency (most likely) from your source file (your RealAudio file). This is why using professional frequency conversion may help.

My own guess is that your Panasonic Player is not really set up to play mp3 files at the Voice preset setting (which is why the squelch is not present on your computer but is present on your portable player).

For best results with your Panasonic mp3 player I would strongly suggest that you feed it mp3 files encoded at 44.1 kHz. at a bitrate no lower than 96 kbs. And it is safer to use a constant bitrate rather than variable- or asverage bitrate settings when transferring to a portable player. So for Lame select No Preset, and select constant bitrate and then select your bitrate.

Hope this helps.
Best wishes,
Bill