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Table 1 Scale description of the listening test criteria [43]

From: An adaptive a priori SNR estimator for perceptual speech enhancement

Rating Description
Speech  
5 Not degraded
4 Little degraded
3 Somewhat degraded
2 Fairly degraded
1 Very degraded
Background noise  
5 Not noticeable
4 Somewhat noticeable
3 Noticeable but not intrusive
2 Fairly conspicuous, somewhat intrusive
1 Very conspicuous, very intrusive
Musical noise  
5 Not noticeable
4 Somewhat noticeable
3 Noticeable but not intrusive
2 Fairly conspicuous, somewhat intrusive
1 Very conspicuous, very intrusive