Table 3 MOS grades [32]
From: Semi-fragile digital speech watermarking for online speaker recognition
MOS | Quality | Quality scale | Effort required to understand meaning scale |
|---|---|---|---|
5 | Excellent | Imperceptible | No effort required |
4 | Good | Perceptible, but not annoying | No appreciable effort required |
3 | Fair | Slightly annoying | Moderate effort required |
2 | Poor | Annoying | Considerable effort required |
1 | Bad | Very annoying | No meaning was understood |