| Synthesizing speech from Doppler signals Recent countries visiting this post |  |
 | 4 | United States |
 | 3 | Germany |
 | 3 | Russian Federation |
 | 1 |
| Synthesizing speech from Doppler signals Recent countries visiting this post | |
| 4 | United States |
| 3 | Germany |
| 3 | Russian Federation |
| 1 |