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Loudness and AI


Loudness and the articulation index are closely related in Fletcher's
definitive version of the articulation index calculation (Fletcher and Galt,
1950).  For example, Fletcher's version uses two sets of frequency-wise
weights to account for the consequences of the frequency response on
speech sound recognition.  These weights are referred to as G1 (low speech
levels) and G4 (high speech levels) and were derived from loudness
experiments using speech.  The loudness weights are used in addition to the
well-known band-importance weights (Fletcher's D).  Notably, loudness is NOT
included in other versions of the articulation index calculation such as
ANSI S3.5-1969; 1997.

Reference:   Fletcher, H. and Galt, R.H. (1950).   "The perception of speech
and its relation to telephony," Journal of the Acoustical Society of America
22, 89-151.

Christine M Rankovic, PhD
Articulation Incorporated
94 Berkshire Road
Newton, MA  02460

AI = V x E x F x H

----- Original Message -----
From: "Belisario Nina" <
To: <
Sent: Sunday, August 22, 2004 4:49 PM
Subject: Loudness and Articulation index

> Is it possible to say that Loudness and Articulation index are closely
> related?
> Any advice is really appreciated.
> Belisario
> --
> Faculdade de Engenharia Mecanica - UNICAMP