无法修复python中列表索引超出范围的问题，并且无法通过绘制点获得所需的输出

Question

这是用脉冲编码调制方法将给定的正弦信号转换成数字编码的程序。你知道吗

import matplotlib.pyplot as plt
import numpy
Amplitude=input("Enter the Amplitude: ")
Time=input("Enter the Time: ")
Frequency=1.0/Time
x=numpy.linspace(-Amplitude,Amplitude,num=Time*10)
series=Amplitude*numpy.sin(2*numpy.pi/Frequency*x)
plt.plot(series)
plt.show()
Quantization=input("Enter the Quantization bit: ")
power=pow(2,Quantization-1)
Size=2*Amplitude/power
z=[]
for t in range(0,Time*10):
    if(series[t]>=0):
        p=0
        n=Size
        for k in range(0,power-1):
            if((series[t]>=p)and(series[t]<=n)):
                z.append(k+power)
                break
            p=n
            n=Size+n
    else:
        p=-1
        n=-Size
        for k in range(0,power-1):
            if((series[t]<=p)and(series[t]>=n)):
                z.append(power-k-1)
                break
            p=n
            n=n-Size
plt.plot(z)
plt.show()
print z
signal=[]
rem=0
for j in range(0,Time*10):
    i=1
    summ =0
    while 1:
        if(z[j]>0):
            rem=int(z[j])%2
            summ=summ+(i*rem)
            z[j]=z[j]/2
            i=i*10
        else:
            signal.append(summ)
            break
print signal

下面是问题

[root@vijay ~]# python PCM.py
Enter the Amplitude: 20
Enter the Time: 10
Enter the Quantization bit: 3
[4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4]
Traceback (most recent call last):
  File "PCM.py", line 42, in <module>
    if(z[j]>0):
IndexError: list index out of range

在注释了最后一个for循环之后，显示的信号输出中还有另一个问题。好像你在运行下面的程序

import matplotlib.pyplot as plt
import numpy
Amplitude=input("Enter the Amplitude: ")
Time=input("Enter the Time: ")
Frequency=1.0/Time
x=numpy.linspace(-Amplitude,Amplitude,num=Time*10)
series=Amplitude*numpy.sin(2*numpy.pi/Frequency*x)
plt.plot(series)
plt.show()
Quantization=input("Enter the Quantization bit: ")
power=pow(2,Quantization-1)
Size=2*Amplitude/power
z=[]
for t in range(0,Time*10):
    if(series[t]>=0):
        p=0
        n=Size
        for k in range(0,power-1):
            if((series[t]>=p)and(series[t]<=n)):
                z.append(k+power)
                break
            p=n
            n=Size+n
    else:
        p=-1
        n=-Size
        for k in range(0,power-1):
            if((series[t]<=p)and(series[t]>=n)):
                z.append(power-k-1)
                break
            p=n
            n=n-Size
plt.plot(z)
plt.show()
print z

我们有两个情节。1个绘图图是正确的，但第二个在时间=60（x轴=60）时有故障，根据概念和编程，那里的期望值应该是3.0，但不是。你知道吗

请帮助，我是python新手，无法调试问题。谢谢