用python写出动听的歌声

准备

  1. 一首歌的谱子
  2. 所有要用到音阶的声音频率
  3. python环境

行动

  1. 首先我们需要一个生成正弦波的函数

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    def wv(t=0,f=0,v=0.5,wf=ff,sr=8000):
        '''  
        t:写入时长
        f:声音频率
        v：音量
        wf：一个可以写入的音频文件
        sr：采样率
        '''
        tt=0
        dt=1.0/sr

        while tt<=t:
            s=math.sin(tt*math.pi*f)*v*(2**15)#采样，调节音量，映射到[-2^15,2^15)
            s=int(s)
            fd=struct.pack("h",s)#转换成8bit二进制数据
            wf.writeframes(fd)#写入音频文件
            tt+=dt#时间流逝

  2. 然后我们准备好简谱，然后翻译成对应的声音频率

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    # 使用到的音阶的频率
    note={"1":262,"2":294,"3":330,"4":349,"5":392,"6":440,"7":494,"6-":220,"0":0}
    # 简谱
    n=[
        "1","2","3","1","1","2","3","1","0",
        "3","4","5","0","3","4","5","0",
        "5","6","5","4","3","1","0","5","6","5","4","3","1","0",
        "2","6-","1","0","2","6-","1"
    ]
    # 音长
    tm=[
        2,2,2,2,2,2,2,2,1,
        2,2,2,1.5,2,2,2,2,
        1,1,1,1,2,2,1,1,1,1,1,1,2,1,
        2,2,2,2,2,2,2
    ]

  3. 执行

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    #!/usr/bin/python
    # -*- coding: UTF-8 -*-
    import wave
    import math
    import struct
    import matplotlib.pyplot as plt
    import numpy as np
    ff=wave.open("v1.wav","w")
    ff.setframerate(8000)
    ff.setnchannels(1)
    ff.setsampwidth(2)

    for i in range(len(n)):
        wv(tm[i]/4.0,note[n[i]])

    ff.close()
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