我想做声音/音频和音乐处理方面的事情。
在此之前，我创建了一个 10 秒扫描的样本信号。
我有一个简单的脚本，必须绘制一些信号。
第一个信号是一个简单的正弦波；第二次扫描；两者的频率都略低于奈奎斯特频率，所以没问题。
代码：
#import
import numpy as np
import scipy.signal as sig
import matplotlib.pylab as plt
f0 = 50
f1 = 20000
t1 = 10
t = np.arange(0,t1,1/44100)#[numpy.newaxis];
print(t.shape)
sine = np.sin(2*np.pi*f0*t)
plt.plot(t, sine)
plt.xlabel('Angle [rad]')
plt.ylabel('sin(t)')
plt.axis('tight')
plt.show()
sweep = sig.chirp(t,f0,t1,f1,'linear',90)
plt.plot(t, sweep)
plt.xlabel('Angle [rad]')
plt.ylabel('sin(t)')
plt.axis('tight')
plt.show()
当我运行 Python 代码时，它在简单的正弦波上运行良好，但在扫描时则不然。
它给出了以下错误：
runfile('C:/Users/****/Documents/python/test_sweep.py', wdir='C:/Users/****/Documents/python')
(441000,)
Traceback (most recent call last):
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\IPython\core\formatters.py", line 330, in __call__
return printer(obj)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\IPython\core\pylabtools.py", line 207, in <lambda>
png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\IPython\core\pylabtools.py", line 117, in print_figure
fig.canvas.print_figure(bytes_io, **kw)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\backend_bases.py", line 2158, in print_figure
**kwargs)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\backends\backend_agg.py", line 521, in print_png
FigureCanvasAgg.draw(self)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\backends\backend_agg.py", line 469, in draw
self.figure.draw(self.renderer)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\figure.py", line 1085, in draw
func(*args)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\axes\_base.py", line 2110, in draw
a.draw(renderer)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\lines.py", line 715, in draw
drawFunc(renderer, gc, tpath, affine.frozen())
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\lines.py", line 1072, in _draw_lines
self._lineFunc(renderer, gc, path, trans)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\lines.py", line 1112, in _draw_solid
renderer.draw_path(gc, path, trans)
File "C:\Users\****\Documents\python\WinPython-64bit-3.4.3.5\python-3.4.3.amd64\lib\site-packages\matplotlib\backends\backend_agg.py", line 163, in draw_path
self._renderer.draw_path(gc, path, transform, rgbFace)
OverflowError: Allocated too many blocks
改变频率时f1到采样频率的 10% 左右，我没有任何错误。
但我想在 CD 音频范围内创建一些扫描，那么发生了什么以及如何避免这个问题
编辑：我在 Windows/Ubuntu 上使用 Spyder 和 IPython。
编辑2：我知道屏幕分辨率不够精细...但除此之外GNU Octave/ Matlab/ ...它工作得很好。
具有相同数量样本的简单正弦波工作正常......所以它对数据点的反应不同......
