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IP Communications and Services for NGN
book

IP Communications and Services for NGN

by Johnson I Agbinya
December 2009
Intermediate to advanced content levelIntermediate to advanced
411 pages
12h 24m
English
Auerbach Publications
Content preview from IP Communications and Services for NGN
VoIP: Voice over Internet Protocol 313
Subjective Quality Assessment or Opinion Rating
e most widely used subjective quality assessment method is opinion rating,
which is defined in ITU-T Recommendation P.800. e performance of the system
under test is rated directly (absolute category rating, ACR) or relative to the subjec-
tive quality of a reference system (degradation category rating, DCR). e ITU-T
opinion scale used in an ACR test is the most frequently used, with the following
scoring patterns: excellent (5), good (4), fair (3), poor (2), and bad (1).
In a DCR test, the subjects are instructed to rate the conditions according
to the following five-point degradation category scale: degradation is inaudible
(5
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Publisher Resources

ISBN: 9781420070910