| Spectral Audio Signal Processing Recent countries visiting this post |  |
 | 78 | United States |
 | 6 | |
 | 3 | China |
 | 2 | Japan |
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| Spectral Audio Signal Processing Recent countries visiting this post | |
| 78 | United States |
| 6 | |
| 3 | China |
| 2 | Japan |
| 2 | Russian Federation |
| 1 | Germany |
| 1 | Ukraine |
| 1 | Korea, Republic of |
| 1 | Australia |
| 1 | United Kingdom |
| 1 | India |
| 1 | Poland |