Table 1 Computational complexity of the seven narrowband ANC systems in terms of real multiplications
| Â | FX-NANC | DFX-NANC | BFX-NANC | LFX-NANC | FE-NANC | LFE-NANC | CFX-NANC |
|---|---|---|---|---|---|---|---|
Controller output | \(2q\) | \(2q\) | \(2q\) | \(2q\) | \(2q\) | \(2q\) | \(8q\) |
Reference filtering | \(2q\hat{M}\) | \(0\) | \(2\hat{M} + 8q\) | \(2q\hat{M}_{l}\) | \(\hat{M}\) | \(q\hat{M}_{l}\) | \(8q\) |
Weight updating | \(3q\) | \(3q\) | \(3q\) | \(3q\) | \(3q\) | \(3q\) | \(10q\) |
Total | \(2q\hat{M} + 5q\) | \(5q\) | \(2\hat{M} + 13q\) | \(2q\hat{M}_{l} + 5q\) | \(\hat{M} + 5q\) | \(q\hat{M}_{l} + 5q\) | \(26q\) |