Python实现简易语音命令识别：基于特征提取与DTW算法

# coding=utf8
import os
import wave
import dtw
import numpy as np
import pyaudio

def compute_distance_vec(vec1, vec2):
 return np.linalg.norm(vec1 - vec2) #计算两个特征之间的欧氏距离

class record():
 def record(self, CHUNK=44100, FORMAT=pyaudio.paInt16, CHANNELS=2, RATE=44100, RECORD_SECONDS=200,
    WAVE_OUTPUT_FILENAME="record.wav"):
  #录歌方法
  p = pyaudio.PyAudio()
  stream = p.open(format=FORMAT,
      channels=CHANNELS,
      rate=RATE,
      input=True,
      frames_per_buffer=CHUNK)
  frames = []
  for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
   data = stream.read(CHUNK)
   frames.append(data)
  stream.stop_stream()
  stream.close()
  p.terminate()
  wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
  wf.setnchannels(CHANNELS)
  wf.setsampwidth(p.get_sample_size(FORMAT))
  wf.setframerate(RATE)
  wf.writeframes(''.join(frames))
  wf.close()

class voice():
 def loaddata(self, filepath):
  try:
   f = wave.open(filepath, 'rb')
   params = f.getparams()
   self.nchannels, self.sampwidth, self.framerate, self.nframes = params[:4]
   str_data = f.readframes(self.nframes)
   self.wave_data = np.fromstring(str_data, dtype=np.short)
   self.wave_data.shape = -1, self.sampwidth
   self.wave_data = self.wave_data.T #存储歌曲原始数组
   f.close()
   self.name = os.path.basename(filepath) # 记录下文件名
   return True
  except:
   raise IOError, 'File Error'

 def fft(self, frames=40):
  self.fft_blocks = [] #将音频每秒分成40块，再对每块做傅里叶变换
  blocks_size = self.framerate / frames
  for i in xrange(0, len(self.wave_data[0]) - blocks_size, blocks_size):
   self.fft_blocks.append(np.abs(np.fft.fft(self.wave_data[0][i:i + blocks_size])))
 @staticmethod
 def play(filepath):
  chunk = 1024
  wf = wave.open(filepath, 'rb')
  p = pyaudio.PyAudio()
  # 播放音乐方法
  stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
      channels=wf.getnchannels(),
      rate=wf.getframerate(),
      output=True)
  while True:
   data = wf.readframes(chunk)
   if data == "": break
   stream.write(data)
  stream.close()
  p.terminate()
if __name__ == '__main__':
 r = record()
 r.record(RECORD_SECONDS=3, WAVE_OUTPUT_FILENAME='record.wav')
 v = voice()
 v.loaddata('record.wav')
 v.fft()
 file_list = os.listdir(os.getcwd())
 res = []
 for i in file_list:
  if i.split('.')[1] == 'wav' and i.split('.')[0] != 'record':
   temp = voice()
   temp.loaddata(i)
   temp.fft()
   res.append((dtw.dtw(v.fft_blocks, temp.fft_blocks, compute_distance_vec)[0],i))
 res.sort()
 print res
 if res[0][1].find('open_qq') != -1:
  os.system('C:\program\Tencent\QQ\Bin\QQScLauncher.exe') #我的QQ路径
 elif res[0][1].find('zhimakaimen') != -1:
  os.system('chrome.exe')#浏览器的路径，之前已经被添加到了Path中了
 elif res[0][1].find('play_music') != -1:
  voice.play('C:\data\music\\audio\\audio\\ (9).wav') #播放一段音乐
 # r = record()
 # r.record(RECORD_SECONDS=3,WAVE_OUTPUT_FILENAME='zhimakaimen_09.wav')