1、下载与安装scipy
scipy下载链接： http://www.scipy.org/Download#head-0dfc04e10313d2e70988c6cb3bef7a9e09860c8f
同时可以下载说明文档链接http://docs.scipy.org/doc/
2、wav文件写操作
3、signal.chirp函数使用说明
4、点击按钮实现信号生成，点击按钮实现信号显示
5、Python代码
#!usr/bin/env python
#code=utf-8
from Tkinter import *
import wave
import numpy as np
import scipy.signal as signal
import matplotlib.pyplot as plt
import sys
sys.setrecursionlimit(1000000)
#define the params of wave
channels = 1
sampwidth = 2
framerate = 9600
file_name = 'sweep.wav'
frequency_begin = 1
frequency_end = 100
#define the time of wave
time = 1
def Generate_Wav():
#generate the time bar
t = np.arange(0,time,1.0/framerate)
#generate the chirp signal from 300 to 3300Hz
wave_data = signal.chirp(t, frequency_begin, time, frequency_end, method = 'linear')*1000
#cast to the type of short
wave_data = wave_data.astype(np.short)
#open a wav document
f = wave.open(file_name,"wb")
#set wav params
f.setnchannels(channels)
f.setsampwidth(sampwidth)
f.setframerate(framerate)
#turn the data to string
f.writeframes(wave_data.tostring())
f.close()
def my_button(root,label_text,button_text,button_func):
'''''function of creat label and button'''
#label details
label = Label(root)
label['text'] = label_text
label.pack()
#label details
button = Button(root)
button['text'] = button_text
button['command'] = button_func
button.pack()
def read_wave_data(file_path):
#open a wave file, and return a Wave_read object
f = wave.open(file_path,"rb")
#read the wave's format infomation,and return a tuple
params = f.getparams()
#get the info
nchannels, sampwidth, framerate, nframes = params[:4]
#Reads and returns nframes of audio, as a string of bytes.
str_data = f.readframes(nframes)
#close the stream
f.close()
#turn the wave's data to array
wave_data = np.fromstring(str_data, dtype = np.short)
time = np.arange(0, nframes) * (1.0/framerate)
return wave_data, time
def Plot_Wav():
wave_data, time = read_wave_data(file_name)
plt.plot(time, wave_data)
plt.grid(True)
plt.show()
def main():
root = Tk()
my_button(root, 'Generate a sweep wav', 'Generate', Generate_Wav)
my_button(root, 'Plot the wav', 'Plot', Plot_Wav)
root.mainloop()
if __name__ == "__main__":
main()
