[python sound] wav 파일 만들기

임의적으로 sine 파형을 만들어 wave 파일로 저장하는 python code

1kHz sine wav 파일 만들기

import math import wave import struct freq = 1000.0 data_size = 40000*4 fname = "WaveTest.wav" frate = 44100.0 amp = 64000.0     # multiplier for amplitude sine_list_x = [] for x in range(data_size):     sine_list_x.append(math.sin(2*math.pi*freq*(x/frate))) wav_file = wave.open(fname, "w") nchannels = 1 sampwidth = 2 framerate = int(frate) nframes = data_size comptype = "NONE" compname = "not compressed" wav_file.setparams((nchannels, sampwidth, framerate, nframes,     comptype, compname)) for s in sine_list_x:     # write the audio frames to file     wav_file.writeframes(struct.pack('h', int(s*amp/2))) wav_file.close() import os os.startfile(fname)

참조 : http://stackoverflow.com/questions/3637350/how-to-write-stereo-wav-files-in-python

Reading
위 코드에서 저장한 wav file을 읽어 그래프로 보는 python code 임.

import wave import struct import numpy as np import matplotlib.pyplot as plt fname = ".\WaveTest.wav" wav_file = wave.open(fname, "r") framerate = float(wav_file.getframerate()) nframes = wav_file.getnframes() time = np.arange(0, nframes/framerate, 1/framerate) data = [] for i in range(0,nframes):     waveData = wav_file.readframes(1)     data.append(struct.unpack(" wav_file.close() plt.plot(time, data) plt.xlabel("times[s]") plt.ylabel("data") plt.xlim(0, 0.01) plt.show()

참조1 : http://stackoverflow.com/questions/2060628/how-to-read-wav-file-in-python
참조2 : http://matplotlib.org/faq/usage_faq.html
down : matplotlib, numpy

이상!!