Python-generate a WAV file

1. Download and install scipy

Scipy download link: http://www.scipy.org/Download#head-0dfc04e10313d2e70988c6cb3bef7a9e09860c8f

You can also download instructions link http://docs.scipy.org/doc/

2. Wav file write operations

3. Signal. chirp function instructions

4. click the button to generate the signal. click the button to display the signal.

5. PythonCode

 

#! Usr/bin/ENV Python # code = utf-8from tkinter import * import waveimport numpy as npimport scipy. signal as signalimport matplotlib. pyplot as pltimport syssys. define (1000000) # define the Params of wavechannels = 1 sampwidth = 2 framerate = 9600file_name = 'sweep.wav 'frequency _ begin = coding = 100 # define the time of wavetime = 1def generate_wav (): # generate the time Bart = NP. arange (0, time, 1.0/framerate) # generate the chirp signal from 300 to 3300hzwave_data = signal. chirp (T, frequency_begin, time, frequency_end, method = 'linear ') * 1000 # cast to the type of shortwave_data = wave_data.astype (NP. short) # open a WAV documentf = wave. open (file_name, "WB") # Set WAV paramsf. setnchannels (channels) F. setsampwidth (sampwidth) F. setframerate (framerate) # Turn the data to stringf. 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, timedef 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 ()