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  ACQUA Extension Modules (ACOPT) Overview    ACOPT 21
ACOPT 21 - 3QUEST (Code 6844)
3QUEST (3-fold QUality Evaluation of Speech in Telecommunications) is an optional calculation method for the communication analysis system ACQUA which allows the objective speech quality evaluation of telecommunication terminals. It is based on the ETSI standards EG 202 396-3 and TS 103 106 which cover both wideband and narrowband scenarios including background noise.
The respective databases for both methods are based on numerous listening tests with subjective evaluation according to ITU-T Rec. P.835 and were partly carried out and validated by co-operation partners.
Screenshot ATP 01
The 3QUEST algorithm calculates three MOS values (Mean Opinion Scores) on a scale of 1 to 5 according to ITU-T Rec. P.835:
S-MOS = Speech MOS, evaluates distortion of speech
N-MOS = Noise MOS, evaluates noticeable intrusiveness of the background noise
G-MOS = Global MOS, overall quality evaluation
Note: All ACOPTs require the latest ACQUA version.
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