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Table 1 The five-point scale in the Mean Opinion Score.

From: Improved Noise Minimum Statistics Estimation Algorithm for Using in a Speech-Passing Noise-Rejecting Headset

Rating

Speech quality

Levels of distortion

5

Excellent

Imperceptible

4

Good

Just perceptible but not annoying

3

Fair

Perceptible and annoying

2

Poor

Annoying but not objectionable

1

Unsatisfactory

Objectionable