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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