想训练一套自己的语音识别系统(命令词识别系统)，首先得准备一套自己的语料库，发动身边的帅哥美女们帮忙进行录音。Python无所不能，很多工具包能给让我们的工作变的简单、优雅。

今天就给大家分享一下基于PyAudio的录音工具，可以方便的利用我们的笔记本电脑进行录音。首先需要准备好环境，安装PyAudio：pip install pyaudio(pyhook不再累述)，创建Python文件record.py:

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

#-*- author yangdengqiang -*-

import os

import sys

import threading

from time import ctime,sleep

import pyHook

import pythoncom

from pyaudio import PyAudio, paInt16

import numpy as np

from datetime import datetime

import wave

flag = False

NUM_SAMPLES = 1024*4 #pyaudio内置缓冲大小

SAMPLING_RATE = 16000 #取样频率，kaldi识别仅支持16KHz，16-bit位深

LEVEL = 500 #声音保存的阈值

COUNT_NUM = 20 #NUM_SAMPLES个取样之内出现COUNT_NUM个大于LEVEL的取样则记录声音

SAVE_LENGTH = 8 #声音记录的最小长度：SAVE_LENGTH * NUM_SAMPLES 个取样

TIME_COUNT = 20 #录音时间，单位s

Voice_String = []

SPEAKER_NO = '001' #录音者id,1,2,...,10

WAV_ID = 0 #录音文件ID

CONTENT = [] #录音内容list

SPEAKER_NAME = 'default'

def speech_recogniton(func):

for i in range(2):

print ("I was at the %s! %s" %(func,ctime()))

sleep(5)

def startHookManager():

# 创建一个：钩子“管理对象

hm = pyHook.HookManager()

# 监听所有的键盘事件

hm.KeyDown = onKeyboardEvent

#设置键盘”钩子“

hm.HookKeyboard()

# 进入循环侦听，需要手动进行关闭，否则程序将一直处于监听的状态。可以直接设置而空而使用默认值

pythoncom.PumpMessages()

def savewav(filename):

wf = wave.open(filename, 'wb')

wf.setnchannels(1)

wf.setsampwidth(2)#2

wf.setframerate(SAMPLING_RATE)

wf.writeframes(np.array(Voice_String).tostring())

# wf.writeframes(self.Voice_String.decode())

wf.close()

def recoder():

global flag, Voice_String;

pa = PyAudio()

stream = pa.open(format=paInt16, channels=1, rate=SAMPLING_RATE, input=True,

frames_per_buffer=NUM_SAMPLES)

save_count = 0

save_buffer = []

time_count = TIME_COUNT

while flag:

print('...')

time_count -= 1

# print time_count

# 读入NUM_SAMPLES个取样

string_audio_data = stream.read(NUM_SAMPLES)

# 将读入的数据转换为数组

audio_data = np.fromstring(string_audio_data, dtype=np.short)

# 计算大于LEVEL的取样的个数

large_sample_count = np.sum( audio_data > LEVEL )

# print(np.max(audio_data))

# 如果个数大于COUNT_NUM，则至少保存SAVE_LENGTH个块

if large_sample_count > COUNT_NUM:

save_count = SAVE_LENGTH

else:

save_count -= 1

if save_count < 0:

save_count = 0

Voice_String = save_buffer

if save_count > 0 :

# 将要保存的数据存放到save_buffer中

#print save_count > 0 and time_count >0

save_buffer.append( string_audio_data )

Voice_String = save_buffer

else:

#print save_buffer

# 将save_buffer中的数据写入WAV文件，WAV文件的文件名是保存的时刻

#print "debug"

if len(save_buffer) > 0 :

Voice_String = save_buffer

save_buffer = []

print("Recode a piece of voice successfully!")

return True

if time_count==0:

if len(save_buffer)>0:

Voice_String = save_buffer

save_buffer = []

print("Recode a piece of voice successfully!")

return True

else:

return False

stream.stop_stream()

stream.close()

pa.terminate()

def onKeyboardEvent(event):

global flag, WAV_ID, CONTENT, SPEAKER_NO

if event.Key == "Space": # 点击空格

if flag == False:

print("=======开始录音=======");

threading.Thread(target=recoder).start();

flag = True;

else:

WAV_ID = WAV_ID + 1

curSeq = '00' + str(WAV_ID)

wavename = str(SPEAKER_NO) + '_' + curSeq[-3:] + '.wav'

savewav(wavename);

print("========结束录音======");

print(wavename + '保存成功')

print("======================")

flag = False

if WAV_ID > len(CONTENT)-1:

print("录音完毕，程序将退出!")

exit()

print("下一条：" + CONTENT[WAV_ID])

return True

else:

if event.Key == "Q":

print("退出录音")

exit();

else:

return True

def printOneLine():

global CONTENT

fh = open("xiaozhi2.txt", "r", encoding="utf-8")

CONTENT = fh.readlines()

print("命令总长度为：%s"%len(CONTENT))

print("第%s条：%s"%(WAV_ID,CONTENT[WAV_ID]))

os.chdir(SPEAKER_NAME)

if __name__ == "__main__":

if len(sys.argv) != 3:

print("usage: python record.py username startIndex....")

exit()

SPEAKER_NAME = sys.argv[1] #用户名，用于保存目录

WAV_ID = int(sys.argv[2])#开始录音index

if os.path.exists(SPEAKER_NAME):

print("your dir is already exists...")

else:

try:

os.mkdir(SPEAKER_NAME)

except OSError as exc:

if exc.errno == errno.EEXIST and os.path.isdir(path):

pass

else: raise

print("it will started from: %s"%WAV_ID)

printOneLine() #读取录音内容

startHookManager(); #开始录音

保存文件，直接执行python record.py即可进行录音操作，按一次空格键录一条语音，可以方便快速的完成实验所需的语料库录音工作。

欢迎语音识别爱好者一起学习交流。