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Table 1 Processing conditions included in the seven databases. PL refers to packet-loss conditions, BP to bandpass filtering and TD to tandeming of speech codecs.

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

Database Context Conditions
1   NB Clean, G.726, G.729, TD, PL at %
   NB/WB Clean, G.722, G.722.1, G.722.2, G.711, G.726, G.729, PL at %
2   NB Clean, BP, G.726, G.729A
   NB/WB Clean, BP, G.722.2, G.711, G.726
3   NB/WB Clean, G.722, G.722.1, G.722.2, G.711, G.726, G.729, GSM-EFR, PL at %
4   NB/WB Clean, BP, MNRU, G.722, G.722.1, G.722.2, G.711, G.726, G.729, TD, VoIP, PL at %
5   NB Clean, G.711, G.729A, G.723.1, AMR, TD, PL at %
   NB/WB Clean, G.722, G.722.2, G.729EV, G.711, AMR, TD, PL %
6 1 NB MNRU, G.711, G.726, G.729, GSM-FR, TD
  3 NB Clean, MNRU, G.726, G.729, BGN, PL at %
7   NB/WB Clean, BP, MNRU, G.722.2, G.729A, 5 candidate codecs for G.729.1
  1. G.729EV refers to the prepublished version of the ITU-T Rec. G.729.1 [7] standard.