我正在寻找一个数字信号,并使用python将其用0和1调制成模拟信号。我遇到的问题是,当波浪移动时,它似乎朝着错误的方向移动。这是到目前为止我的代码,我知道它不好看
import numpy as np
import math
import matplotlib.pyplot as plot
def plotPoint():
current = 0
amplitude = 1
frequency = 2000
X = []
Y1 = []
Y2 = []
signal= [1,0,1,1,0,1,0,1,0,0]
while current < 10000:
if current < 1000 and signal[0] == 1:
Y2.append(1)
elif current < 2000 and current >= 1000 and signal[1] == 1:
Y2.append(1)
elif current < 3000 and current >= 2000 and signal[2] == 1:
Y2.append(1)
elif current < 4000 and current >= 3000 and signal[3] == 1:
Y2.append(1)
elif current < 5000 and current >= 4000 and signal[4] == 1:
Y2.append(1)
elif current < 6000 and current >= 5000 and signal[5] == 1:
Y2.append(1)
elif current < 7000 and current >= 6000 and signal[6] == 1:
Y2.append(1)
elif current < 8000 and current >= 7000 and signal[7] == 1:
Y2.append(1)
elif current < 9000 and current >= 8000 and signal[8] == 1:
Y2.append(1)
elif current < 10000 and current >= 9000 and signal[9] == 1:
Y2.append(1)
else:
Y2.append(0)
if Y2[-1] == 1:
point2 = amplitude*math.sin((2*np.pi/frequency)*current)
else:
point2 = amplitude*math.sin((2*np.pi/(frequency/2)*current)
X.append(current)
Y1.append(point2)
current += 1
plot.plot(X,Y1)
plot.plot(X,Y2)
plot.title('Digital Signal')
plot.xlabel('Time')
plot.ylabel('Amplitude')
plot.grid(True, which='both')
#plot.axhline(y=0, color='k')
plot.show()
plotPoint()
您可以看到数字和模拟信号都显示出来。我使用了2kHz的频率作为载波,你可以在这张图中看到它何时移动 我做错了什么?我该怎么补救呢
根据barny的建议,这需要对您的代码进行少量修改:
这就是你要找的吗
此代码适用于频率和间隔的任意组合:
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