Table 1 Total count of five sound types acquired during rehabilitation training before release.
Signal description | Whistle | Broadband signal | Pen friction sound | Sweep signal | High-frequency signal |
|---|---|---|---|---|---|
Total count | 476 | 33 | 56 | 41 | 313 |
Daytime | 63% | 100% | 100% | 100% | 100% |
Nighttime | 37% | 0% | 0% | 0% | 0% |