> -----Original Message-----
> [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
>
> daniel zhang wrote:
>
> > 1. MOS
> > Voice quality was traditionally reported as a Mean Opinion
> Score (MOS)
> > on a scale from 1-5 where 1 is the lowest and 5 the highest.
> > I am not an expert on this but I think probably we could
> add the MOS
> > into Ethereal.
>
> At least according to the Wikipedia article on the Mean Opinion Score:
>
> http://en.wikipedia.org/wiki/Mean_Opinion_Score
>
> the score comes from people listening to particular phrases
> and giving their 1-to-5 rating of the quality of the sound,
> not from a calculation you could perform on a raw digital
> signal.
> [...]
That's true, but there have been many attempts to model MOS from raw data
directly.
The most prominent being the ITU G.107 "E-Model".
But still, the model includes parameters like the audio characteristics of
the end devices, jitter buffer implementations and so on, so MOS cannot be
calculated from a network trace without making specific assumptions on the
end devices and audio path.
Best regards,
Lars Ruoff
