Naturally, forecasters began to look at the wild and woolly places where only chaotic nonlinear equations ruled. 预测者们自然地开始把目光投向那些更为狂野和更为杂乱的地方，那些仅由非线性方程统治的地方。
With the information and the undistorted parts, the whole spectrum can be recovered by solving the nonlinear equations, so the AC signal is also recovered. 这一先验知识结合信号中未失真的频谱部分，通过求解一组非线性方程即可近似恢复出交流信号的全部频谱，从而恢复出完整的交流信号。
