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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].

From: Instrumental Estimation of E-Model Parameters for Wideband Speech Codecs

Band. Codec Bit-rate Average value Expected
   (kbit/s) WB-PESQ TOSQA-2001 Mod. WB-PESQ Average DB 1–5 Audit. test from G.113
WB Clean
  G.722
  G.722
  G.722
  G.722.1
  G.722.1
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.722.2
  G.729EV  
  G.729EV  
NB G.711
  G.726
  G.726
  G.726
  G.728
  G.729
  GSM-EFR
  GSM-FR
  1. G.729EV refers to the prepublished version of the ITU-T Rec. G.729.1 [7] standard.