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