[vorbis-dev] vorbis.com

Frank Klemm pfk at fuchs.offl.uni-jena.de
Sat Dec 30 18:01:19 PST 2000

On Sat, Dec 30, 2000 at 07:47:01PM -0600, Mike Coleman wrote:
> Frank Klemm <pfk at fuchs.offl.uni-jena.de> writes:
> > In MP3 80% of the bitrate comes from the bandwidth, 10% from channel
> > coupling/decoupling and 10% from the NMR. Between 32 and 192 kbps the NMR
> > changes by about 3 dB, that's 0.5 bit.
> What's NMR?
Noise to Mask Ratio.

1 bit = 6 dB. But 6 dB difference in the NMR is like day and night.
A NMR of -2 dB sounds really worse and a NMR of +2 dB is nearly
undistinguishable from the original. 

Frank Klemm

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