| A novel cost-effective multi-path adaptive interpolated FIR (IFIR)-based echo canceller Recent countries visiting this post |  |
 | 8 | United States |
 | 3 | Germany |
| A novel cost-effective multi-path adaptive interpolated FIR (IFIR)-based echo canceller Recent countries visiting this post | |
| 8 | United States |
| 3 | Germany |