In this book, speech transmission quality is modeled on the basis
of perceptual dimensions. The author identifies those dimensions
that are relevant for today's public-switched and packet-based
telecommunication systems, regarding the complete transmission path
from the mouth of the speaker to the ear of the listener. Both
narrowband (300-3400 Hz) as well as wideband (50-7000 Hz) speech
transmission is taken into account. A new analytical assessment
method is presented that allows the dimensions to be rated by
non-expert listeners in a direct way. Due to the efficiency of the
test method, a relatively large number of stimuli can be assessed
in auditory tests. The test method is applied in two auditory
experiments. The book gives the evidence that this test method
provides meaningful and reliable results. The resulting dimension
scores together with respective overall quality ratings form the
basis for a new parametric model for the quality estimation of
transmitted speech based on the perceptual dimensions. In a
two-step model approach, instrumental dimension models estimate
dimension impairment factors in a first step. The resulting
dimension estimates are combined by a Euclidean integration
function in a second step in order to provide an estimate of the
total impairment.
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