频谱分析窗类型。
用它来减少在频带之间信号泄漏。
| 矩形 | W[n] = 1.0。 |
| 三角形 | W[n] = 1 - abs(2n/N - 1)。 |
| Hamming | W[n] = 0.54 - 0.46 * cos(2π * n/N)。 |
| Hanning | W[n] = 0.5 * (1.0 - cos(2π * n/N))。 |
| Blackman | W[n] = 0.42 - 0.5 * cos(2π * n/N) + 0.08 * cos(4π * n/N)。 |
| BlackmanHarris | W[n] = 0.35875 - 0.48829 * cos(2π * n/N) + 0.14128 * cos(4π * n/N) - 0.01168 * cos(6π * n/N)。 |
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