Adaptive digital filters with variable step-size may become unstable when their weights are automatically adjusted with input signal and noise.

变步长自适应数字滤波器的权值随信号和噪声的变化自动调整时可能出现不稳定。

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In simulation experiment, results of identifying models using step disturbance of given power signal, white noise signal, and pseudorandom signal as input signals have been compared.

在仿真试验中，比较了给定功率阶跃扰动信号、白噪声信号及伪随机信号分别作为输入信号进行辨识的结果。

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Numerical simulation of pure mass and dynamic specimens was carried out with step signal input and seismic wave input, respectively. Results validate the effectiveness of this method.

对纯质量和动力试件分别进行了阶跃输入和地震波加载试验仿真，结果验证了这种方法的优越性。

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And in the current issue of Applied Physics Letters, a group led by Haroun Ahmed at the Hitachi Cambridge Laboratory in Britain reports another vital step, a single-electron transistor that, for the first time, amplifies its input signal (though only by a factor of 3.7, several hundred times more weakly than a conventional transistor does).

ECONOMIST: The transistor��s heir