Research on the Sound Quality Evaluation Method Based on Artificial Neural Network

Table 3

Scoring standards of MOS test.

Score	Quality evaluation	Distortion degree
5	Excellent	Basically impossible to detect distortion
4	Good	Slightly detect distortion without discomfort
3	Medium	Possible to detect distortion with discomfort
2	Poor	Obnoxious but tolerable
1	Inferior	Obnoxious and intolerable