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matlab
- 巴特沃斯滤波器,主要实现的是低通信号,此功能模块的低通曲线很符合理想的幅频特性。-Butterworth filter, the main achievement is low traffic numbers, the low-pass curve is consistent with this function module ideal frequency characteristics.
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- 2.利用FFT对信号进行谱分析 对于连续信号xa(t)=cos(2πf1t) +5cos(2πf2t) +cos(2πf3t) ,其中f1=6.5kHz, f2=7kHz, f3=9kHz, 以采样频率fs=32 kHz对其进行采样, (1)对xa(t) 信号采集16点样本,分别作16点和补零到256点的FFT,并分别绘出对应的幅频特性曲线。 (2)对xa(t)信号采集256点样本,分别作256点和512点的FFT,并分别绘出对应的幅频特性曲线。 (3)比较(1)和(2)
cvgabor
- 生成gabor变换的5尺度八方向滤波器,结果为三维的幅频特性曲线。(The five - scale eight-direction filter for gabor transform is generated)
幅频特性曲线
- 求给定函数的幅频特性曲线,给定区间进行画图。(Given an analog signal, it is converted to digital signal, calculated by FFT, and the amplitude frequency characteristic curve is drawn.)