Re: [codec] #8: Sample rates?
Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> Wed, 14 April 2010 05:32 UTC
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Date: Wed, 14 Apr 2010 01:30:16 -0400
From: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
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To: Roman Shpount <roman@telurix.com>
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Subject: Re: [codec] #8: Sample rates?
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On 2010-04-14 00:37, Roman Shpount wrote: > To be honest, your slides show that SILK works better at superwideband, > not that superwideband is better then wideband. Then I suggest you have a look at the left graph in slide 7 of: http://www.ietf.org/proceedings/10mar/slides/codec-6.pdf The blue bars show speech quality and the bar that's marked with "7 kHz" means 7 kHz bandwidth, which means *uncompressed* wideband audio. > Normally, G.711 at 8 KHz > has a higher MOS (4.4) score then SILK at superwideband (3.9). Note that MOS is not an absolute measurement and MOS scored can only be compared when they come from the same test. > To > compare wideband vs superwideband (or full rate) you need to compare 16 > Khz linear PCM vs superwideband (or full rate) linear PCM. As far as > full rate is concerned, most men cannot hear above 12-14 khz. I disagree here. Don't know where you got that data, but it doesn't sound right. FTR, like many others, I'm over 30 and still easily hear the NSTC hozontal sync (15.3 kHz) coming out of CRT TVs. > In side by > side listening tests we did, using high end headsets (AKG K-701, > Sennheiser HD 650) and professional DAC/headphone AMP (Benchmark DAC-1) > using prerecorded voice samples (English, adult voices, no kids), nobody > could distinguish wideband from superwideband, but this can be us, our > samples, and untrained listeners. Well, my listening tests that I linked above clearly disagree with your results. Maybe you were using samples that were already low-passed at 7 kHz! Not saying that wideband (and even narrowband) doesn't have a use, just that full-band is definitely useful. Cheers, Jean-Marc
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- Re: [codec] #8: Sample rates? Kevin P. Fleming
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- Re: [codec] #8: Sample rates? Christian Hoene
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Christian Hoene
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Roman Shpount
- Re: [codec] #8: Sample rates? Marc Petit-Huguenin
- Re: [codec] #8: Sample rates? Marc Petit-Huguenin
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Kevin P. Fleming
- Re: [codec] #8: Sample rates? Roman Shpount
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Benjamin M. Schwartz
- Re: [codec] #8: Sample rates? Raymond (Juin-Hwey) Chen
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Koen Vos
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Koen Vos
- Re: [codec] #8: Sample rates? Benjamin M. Schwartz
- Re: [codec] #8: Sample rates? Koen Vos
- Re: [codec] #8: Sample rates? Benjamin M. Schwartz
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Roman Shpount
- Re: [codec] #8: Sample rates? 44.1kHz? Michael Knappe
- Re: [codec] #8: Sample rates? Koen Vos
- Re: [codec] #8: Sample rates? Jean-Marc Valin
- Re: [codec] #8: Sample rates? Mikael Abrahamsson
- Re: [codec] #8: Sample rates? Roman Shpount
- Re: [codec] #8: Sample rates? Christian Hoene
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Roni Even
- Re: [codec] #8: Sample rates? 44.1kHz? Brian West
- Re: [codec] #8: Sample rates? Christian Hoene
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Christian Hoene
- Re: [codec] #8: Sample rates? stephen botzko
- Re: [codec] #8: Sample rates? Schwarz Albrecht
- Re: [codec] #8: Sample rates? 44.1kHz? Christian Hoene
- Re: [codec] #8: Sample rates? 44.1kHz? Koen Vos
- Re: [codec] #8: Sample rates? 44.1kHz? Christian Hoene
- Re: [codec] #8: Sample rates? 44.1kHz? stephen botzko
- Re: [codec] #8: Sample rates? 44.1kHz? stephen botzko
- Re: [codec] #8: Sample rates? codec issue tracker
- Re: [codec] requirements #8 (new): Sample rates? Koen Vos
- Re: [codec] requirements #8 (new): Sample rates? codec issue tracker
- Re: [codec] requirements #8 (new): Sample rates? Roman Shpount
- Re: [codec] requirements #8 (new): Sample rates? Jean-Marc Valin
- Re: [codec] requirements #8 (new): Sample rates? codec issue tracker
- Re: [codec] requirements #8 (new): Sample rates? Roman Shpount
- Re: [codec] requirements #8 (new): Sample rates? Raymond (Juin-Hwey) Chen
- Re: [codec] requirements #8 (new): Sample rates? Koen Vos
- Re: [codec] requirements #8 (new): Sample rates? Jean-Marc Valin
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- Re: [codec] requirements #8 (new): Sample rates? Jean-Marc Valin
- Re: [codec] requirements #8 (new): Sample rates? Jean-Marc Valin
- Re: [codec] requirements #8 (new): Sample rates? Koen Vos
- Re: [codec] requirements #8 (new): Sample rates? Jean-Marc Valin
- Re: [codec] requirements #8 (new): Sample rates? Pascal Pochol
- Re: [codec] requirements #8 (new): Sample rates? Butrus Damaskus
- Re: [codec] requirements #8 (new): Sample rates? Pascal Pochol
- Re: [codec] requirements #8 (new): Sample rates? Gregory Maxwell
- Re: [codec] #8: Sample rates? codec issue tracker