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Old 08 October 2011, 12:45 pm   #1
Grunt's Avatar
Join Date: Oct 2011
Location: Morava
Posts: 3
Default Suzanne Vega - Tonal component removed

Hi guys. Have you ever heard Tom's Diner(.mpc) without tonal component?

I just tried to replace all the "Samples data" with white noise and I was surprised myself how much information nontonal component carries and how good does it sounds despite the fact that polyphase filter bank used in MPEG/MPC has only 32-subbands (is like some equalizer bars with 32-taps (or bars) uniformly dispersed across the spectrum and with time resolution 1152 samples). I knew that for hearing/perceiving purposes, only matters on noise-envelope shape and that envelope shape can be approximated ([1]->[2] and some Monty's articles I think) but I never thought it can be so rough and yet sound so good. Do you know someone about some R&D activity concerning this phenomena (in example I'm interested in: How rough shape can be, what is sufficient frequency & time resolution, what are the relationships between tonal and non-tonal components, how does it all affects p-a masking and so on) best with results in form of papers?

Just out of curiosity: If I subtract from bitstream count of sample bits, I get for this clip 11.2kbps (standard preset and for pure bitstream (packets, their headers + resolution, SCF_types and SCFs)) because on sample data doesn't matter and can be replicated on decoder side. Interesting, isn't it?

Added:with more variations (i.E.: stereo, more Percussion). Tom's Diner is purely voice illustration. 10 meaningless points for every clip, which you identify.

Last edited by Grunt; 08 October 2011 at 01:49 pm. Reason: More examples
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