Table 6 Average impairment factor values 
for WB and NB speech codecs, derived using different signal-based models and auditory tests. Values in the column "Audit. test" have been calculated from the auditory results of the same databases, and values in the last column have been calculated according to (10) using the defined values of ITU-T Rec. G.113 [10].
for WB and NB speech codecs, derived using different signal-based models and auditory tests. Values in the column "Audit. test" have been calculated from the auditory results of the same databases, and values in the last column have been calculated according to (10) using the defined values of ITU-T Rec. G.113 [From: Instrumental Estimation of E-Model Parameters for Wideband Speech Codecs
Band. | Codec | Bit-rate | Average | Expected | ||||
|---|---|---|---|---|---|---|---|---|
(kbit/s) | WB-PESQ | TOSQA-2001 | Mod. WB-PESQ | Average DB 1–5 | Audit. test | from G.113 | ||
WB | Clean |
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G.722 |
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G.722 |
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G.722 |
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G.722.1 |
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G.722.1 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.722.2 |
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G.729EV |
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G.729EV |
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NB | G.711 |
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G.726 |
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G.726 |
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G.726 |
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G.728 |
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G.729 |
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GSM-EFR |
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GSM-FR |
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value
G.729EV refers to the prepublished version of the ITU-T Rec. G.729.1 [7] standard.
G.729EV refers to the prepublished version of the ITU-T Rec. G.729.1 [