Spectral results from MP3, WMA, OGG and AAC measures.





Here are some results from a test I made ~year ago (graphics are generated recently).



Original file

WAV, 16-bit/44.1kHz, Linear Sweep 20Hz-20kHz -6dB)










CODECS:

IIS Fraunhofer Pro v. 3.3.2.144

Lame 3.96

WMA v. 4.02

OGG Xiph. Org Vorbis I

AAC

-------------------------------------------------------------------------------------------------------------------

128kbps / 44.1kHz

WMA




MP3 (Fraunhofer)






MP3 (LAME)




OGG




AAC




196kbps 44.1kHz

WMA




MP3 (Fraunhofer)




MP3 (LAME)




OGG




AAC




256kbps 44.1kHz

WMA




MP3 (Fraunhofer)




MP3 (LAME)




OGG




AAC




320kbps 44.1kHz

WMA




MP3 (Fraunhofer)




MP3 (LAME)




OGG




AAC







Noticed that there is a setting for max. bandwidth on Fraunhofer MP3 codec.



By using this, it's possible to have frequency range up to 22.05 and 24kHz even @ 128kbps ... though, it may not sound good I guess.

128kbps @ 44.1kHz