signal.butter

signal.butter is a function in the SciPy signal processing library that is used to design digital Butterworth filters. The function takes in the filter order, the cutoff frequency, and the type of filter (highpass, lowpass, bandpass, or bandstop) as inputs and returns the numerator and denominator coefficients of the transfer function of the filter. These coefficients can then be used to filter input signals using signal.lfilter or signal.filtfilt functions. The Butterworth filter is a type of infinite impulse response (IIR) filter that has a maximally flat passband and a monotonic roll-off.

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scipy.signal.butter

scipy.signal.butter是一个用于设计数字Butterworth滤波器的函数。Butterworth滤波器是一种常见的滤波器类型，具有平滑的频率响应和较小的相位延迟。该函数可以根据指定的滤波器阶数和截止频率来生成滤波器系数，从而实现数字信号的滤波处理。

scipy.signal.butter的返回值怎么接收

scipy.signal.butter 函数的返回值可以通过一个元组(tuple)的方式接收。元组中包含两个数组，第一个数组是滤波器的分子系数，第二个数组是分母系数。例如：b, a = scipy.signal.butter(N, Wn, btype='low', analog=False)。其中N是滤波器的阶数，Wn是归一化截止频率，btype是滤波器类型，analog是指明是否是模拟滤波器。