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Exact frequency boundaries values of mp3 scalefactor bands, at what frequency each scalefactor bands start \ end ?
post Oct 20 2009, 00:25
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As far as I know, in mp3 there are 22 scalefactor bands, going from 0 up to 21. But despite its name, the last sfb (ie sfb21) has no scalefactor.. The missing scalefactor for sfb21 is said to be the reason why frequences from this band are often not encoded when there's not enough bitrate.

I've searched through the forum and didn't find any table with the exact values of frequency boundaries for mp3 scalefactor bands.
The reason I ask the question is that I want to know - does sfb21 starts exactly from 16000 Hz or not ?
I thought it was, but currently an article in Wikipedia about MP3 states that There is no scale factor band for frequencies above 15.5/15.8 kHz. Is this statement incorrect ?

If the frame of an MP3 file does not feature sfb21 - will this frame have a high-freq cut-off exactly at 16000 Hz ?

This post has been edited by deranger: Oct 20 2009, 00:28
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