python手记(50)

#!/usr/bin/env python

# -*- coding: utf-8 -*-

#http://blog.csdn.net/myhaspl

#code:[email protected]

import wave

import pylab as pl

import numpy as np

print 'http://blog.csdn.net/myhaspl'

print '[email protected]'

print

print 'working...'

print "generate wav data...."

# 打开WAV文档

fo = wave.open(r"plpl1.wav", "wb")

# 设置波形参数

#采样率

framerate = 22050

#声道数

nchannels=2

#每位宽度

sampwidth=2

#长度

nframes =framerate

#频率

freq=440

#最大振幅

max_amplitude = 4000

#每样本秒数

interval=1.0/freq

#每周期样本数

samplepercycle=interval*framerate#=interval/(1/framerate)

wave_data=np.zeros((nframes), dtype=np.short)

maxcycle=2*np.pi

for curpos in xrange(0,nframes):

    possamp=np.sin((curpos/samplepercycle)*maxcycle)

    sampleval=int(max_amplitude*possamp)

    wave_data[curpos]=sampleval

str_data=wave_data.tostring()

#频率

freq=880

#最大振幅

max_amplitude = 2000

#每样本秒数

interval=1.0/freq

#每周期样本数

samplepercycle=interval*framerate#=interval/(1/framerate)

new_wave_data=np.zeros((nframes), dtype=np.short)

maxcycle=2*np.pi

for curpos in xrange(0,nframes):

    possamp=np.sin((curpos/samplepercycle)*maxcycle)

    sampleval=int(max_amplitude*possamp)

    new_wave_data[curpos]=sampleval

# 绘制波形

wave_data.shape = -1, 2

wave_data = wave_data.T

new_wave_data.shape = -1, 2

new_wave_data = new_wave_data.T

time = np.arange(0, nframes/2)[:100]# * (1.0 / framerate)

pl.subplot(323)

pl.plot(time, new_wave_data[0][:100])

pl.subplot(324)

pl.plot(time, new_wave_data[1][:100], c="g")

pl.xlabel("time (seconds)")

#波形叠加

new_wave_data+=wave_data

# 绘制波形

time = np.arange(0, nframes/2)[:100]# * (1.0 / framerate)

pl.subplot(321)

pl.plot(time, wave_data[0][:100])

pl.subplot(322)

pl.plot(time, wave_data[1][:100], c="g")

pl.xlabel("time (seconds)")

time = np.arange(0, nframes/2)[:100]# * (1.0 / framerate)

pl.subplot(325)

pl.plot(time, new_wave_data[0][:100])

pl.subplot(326)

pl.plot(time, new_wave_data[1][:100], c="g")

pl.xlabel("time (seconds)")

#写波形数据参数

print "save new wav files...."

new_str_data=new_wave_data.tostring()

fo.setnchannels(nchannels)

fo.setframerate(framerate)

fo.setsampwidth(sampwidth)

fo.setnframes(nframes)

fo.writeframes(new_str_data)

fo.close()

本博客所有内容是原创，未经书面许可，严禁任何形式的转载

http://blog.csdn.net/u010255642

python 产生声音的正弦波并叠加

>>> runfile(r'K:\book_prog\audio_hy.py', wdir=r'K:\book_prog')
http://blog.csdn.net/myhaspl
[email protected]

working...
generate wav data....
save new wav files....