pl.ylabel("power(dB)") pl.title("FFT result of triangle wave") # 绘制原始的三角波和用正弦波逐级合成的结果,使用取样点为x轴坐标 pl.figure() pl.plot(y, label="original triangle", linewidth=2) for i in [0,1,3,5,7,9]: index, data = fft_combine(fy, i+1, 2) # 计算两个周期的...
pl.title("FFT result of triangle wave")#绘制原始的三角波和用正弦波逐级合成的结果,使用取样点为x轴坐标pl.figure() pl.plot(y, label="original triangle", linewidth=2)foriin[0,1,3,5,7,9]: index, data= fft_combine(fy, i+1, 2)#计算两个周期的合成波形pl.plot(data, label ="N=%s"%i...
pl.title("FFT result of triangle wave")# 绘制原始的三角波和用正弦波逐级合成的结果,使用取样点为x轴坐标pl.figure() pl.plot(y, label="original triangle", linewidth=2)foriin[0,1,3,5,7,9]: index, data = fft_combine(fy, i+1,2)# 计算两个周期的合成波形pl.plot(data, label ="N=%s"...
pl.title("FFT result of triangle wave")# 绘制原始的三角波和用正弦波逐级合成的结果,使用取样点为x轴坐标pl.figure() pl.plot(y, label="original triangle", linewidth=2)foriin[0,1,3,5,7,9]: index, data = fft_combine(fy, i+1,2)# 计算两个周期的合成波形pl.plot(data, label ="N=%s"...
import matplotlib.pyplot as plt #依据快速傅⾥叶算法得到信号的频域 def test_fft():sampling_rate = 8000 #采样率 fft_size = 8000 #FFT长度 t = np.arange(0, 1.0, 1.0/sampling_rate)x = np.sin(2*np.pi*156.25*t) + 2*np.sin(2*np.pi*234.375*t)+ 3*np.sin(2*np.pi*200*...
triangle wave. The expression of the wave is list in table 2. Table 2 the expression of the signal Signal type Mathematic expression Sine wave sin(2 ft ) y A Cosine wave cos(2 ft ) y A Square wave 2 2 2 2 (n 1) A n t n r y A n r t Signal Generatorbased on ...
Analysis of trigonometric function and triangle function by FFT. With IFFT the results back in time domain, by mapping differences before and after signal transformation. Key words: MATLAB,FFT ,IFFT,Raised cosine function,Trigonometric,Triangular wave function 引言 1965年,库利(J.W.Cooley)和图基(J....
In order to address the peak position of the double-wavelength interferometric signal accurately, we transform using FFT technology the cosine amplitude modulated signal of double-wavelength interferometry into a triangle-wave amplitude modulated signal to make the peak position prominent. It is very ...
Completed the main algorithm and spectral analysis of FFT and IFFT by MATLAB programming. First, through the MATLAB programming to achieve the two functions FFT and IFFT. Then use has been piled function raised cosine. Analysis of trigonometric function and triangle function by FFT. With IFFT the...
For the signal generator, the program support 4 types, sine, cosine, square and triangle wave. The expression of the wave is list in table 2. Table 2 the expression of the signal Signal type Mathematic expression Sine wave Cosine wave Square wave y A sin(2 ft ) ...