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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