Message-Id: <A7B4FE84-7C57-4A13-8602-56F14F3B3BEB@standardstrack.com>
From: Eric Burger <eburger@standardstrack.com>
To: Nik Waldron <nik.waldron@kaz-group.com>
In-Reply-To: <OF451B10D3.692C043A-ON4A2575D2.00715DE0@kaz-group.com>
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Date: Fri, 12 Jun 2009 10:52:42 +0100
References: <OF451B10D3.692C043A-ON4A2575D2.00715DE0@kaz-group.com>
Cc: speechsc@ietf.org
Subject: Re: [Speechsc] Question on Verification Result Device type
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Since these are terms of art, let's not change anything.

On Jun 11, 2009, at 9:59 PM, Nik Waldron wrote:

> Hi Christian,
>
> I'm not an expert on MRCPv2 but as someone working on Verification
> implementation and having some familiarity with the field I think that
> this is due to the time at which MRCPv2 was originally drafted.  At  
> that
> time (a part of) the state of the art was an idea known as handset
> normalisation or HNorm.  HNorm set about solving the problem that
> different handsets had very different log likelihood ratio scores.   
> There
> were several variants on the solution, but basically several scores  
> for
> different utterances against the same voiceprint, or scores for the  
> same
> utterance against the different voice prints (or a combination) were  
> used
> to normalise the score.
>
> In particular the microphone type (carbon button, or electret) were  
> major
> categories for distorting scores, and compensating for the  
> microphone type
> found to be effective.  I guess that in order for the system to  
> operate in
> an online way (updating the sets used for normalisation), it might be
> necessary for the results to be categorised by microphone type (if  
> known).
> Others more familiar with the motivations for these fields may wish to
> correct me.
>
> Things have moved on a bit since then, however if you do a search  
> (HNorm,
> TNorm or CNorm) you should be able to find the relevant papers.  If  
> the
> engine you are interested in does not support / use these types of
> normalisation or identify the categories then I'm sure 'unknown' will
> satisfy the specification.
>
> Best regards,
>
>
>
>
> NIK WALDRON
>
>
>
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