MP3 Detection Guide

From Maiden World Live

Table of contents

1 Few important point s about mp3 detection first 2 MP3 encoded with LAME 2.1 128 kbps CBR 2.2 96 kbps CBR & 40 kbps CBR 2.3 >128 kbps CBR 2.4 128 kbps VBR 3 MD Sony MZ-N710 - ATRAC3 3.1 SP mode 3.2 LP2 mode 3.3 LP4 mode

Few important point s about mp3 detection first

• Forget about mp3 detection programs. They are useless because they use same technic as we do with our eyes. There is no way they can detect more accurately. They can only create confusion, beucase they will report many old bootlegs or MD recordings as mp3. Checking for compression artifacts inside wave form is different story, but those programs still do not exist.
• Forget about spectral analysis too. It's not as accurate as frequency analysis.

MP3 encoded with LAME

128 kbps CBR

This is typical example of the cut at 16 kHz.

96 kbps CBR & 40 kbps CBR

96 kbps CBR mp3 has cut at 12 kHz and 40 kbps CBR mp3 at 6 kHz.

>128 kbps CBR

mp3s with a bitrate > 128 kbps CBR still have cut at 16 kHz, but encoder includes frequencies above 16 kHz too, as you can see on those four images. Cut is still detectable, but you have to watch freq. analysis while track is playing.

128 kbps VBR

128 kbps VBR mp3 has cut at 15.5 kHz, but frequencies bellow 15.5 kHz have similar behaviour as frequencies above 16 kHz in previous cases.

MD Sony MZ-N710 - ATRAC3

SP mode

LP2 mode

LP4 mode