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Table 2 Description of the 24 available noise suppression related degradation conditions.

From: Performance Study of Objective Speech Quality Measurement for Modern Wireless-VoIP Communications

Conditions Tandem Codec- PLC Noise Type SNR (dB)
1–18 None G.711, G.729, AMR hoth 0,10
    car 10
    street 10
    babble 10,20
19–24 Asynchronous G.729 G.729, AMR AMR hoth, car, babble 10