The key to MOS is the middle letter: "O"pinion is (or was) they key to MOS.
How MOS was calculated was that a group of folks from different demograhics (women/men, old/young) are asked to listen to several audio samples and record their opinion--on a scale of 0 to 5--of the quality. Rather than a simple 0-5 scale overall, there are several categories. I can't recall exactly, but the scales are somthing like clarity, volume, noise, etc. All the results are tabulated and averaged out. Products exist to calculate the MOS, but that sounds kinda like an electronic art critic. Whether a computer can deliver an "opinion" begs some debate. > -----Original Message----- > From: Leif Madsen [mailto:[EMAIL PROTECTED] > Sent: October 31, 2005 4:54 PM > To: [EMAIL PROTECTED] > Cc: [email protected] > Subject: Re: [on-asterisk] programatically determining audio quality > > > On 10/31/05, Simon P. Ditner <[EMAIL PROTECTED]> wrote: > > I'm load testing an asterisk application, and I'd like to determine > > the audio quality automatically. I'm already doing DTMF > tests, but I'm > > looking for something a little fuzzier I think. > > > > My initial knee-jerk reaction is to record the audio, and > then apply > > some sort of algorithm to it that will provide me with a > few metrics > > to compare with the original recording. Some very > preliminary research > > has turned up two standards, "Perceptual > Analysis/Measurement System" > > (PAMS), and "Perceptual Speech Quality Measure" (PSQM) -- > does anyone > > have any insights into what is behind these standards, or whether > > they're worth researching? > > >From what I've seen, for VoIP, most of the time it is "Mean Opinion > Score" (MOS). A good site for testing this is > TestYourVoIP.com. I also found a simple page on MOS at > http://www.techabulary.com/m/mos.html. > > However I'm not > familar how MOS scoring actually works (in terms of the > algorithm it uses and such). I'd be very interested to have > some sort of automated test of VoIP quality though. > > -- > Leif Madsen. > http://www.leifmadsen.com http://www.oreilly.com/catalog/asterisk > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.362 / Virus Database: 267.12.6/151 - Release > Date: 28/10/2005 > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.12.6/151 - Release Date: 28/10/2005
