一、目的
在实现键盘控制程序开始之后，实现自动录音生成pcm格式function。
要考虑的问题：实时录音，录音结束的条件(阈值)。主要工具: speech_recognition包,代码简单、效果好。
二、电脑录音 (包括使用树莓派时的问题)
主要参考: github
/Uberi/speech_recognition
博客：
Python3从零开始搭建一个语音对话机器人
/NIeson/article/details/96476878
三、code
speech_recognition
/project/SpeechRecognition/
第一步、安装SpeechRecognition
pip install SpeechRecognition (时间比较久)崩溃
pip3 install -i /simple/ SpeechRecognition
只安装SpeechRecognition是不够的，现在运行会报错，提示找不到PyAudio
第二步、安装 pip install pyaudio
Requirements
To
use all of the functionality of the library, you should have:
· Python 2.6, 2.7, or 3.3+ (required)
· PyAudio 0.2.11+ (required only if you need to use microphone input, Microphone)
尝试python -m pip install pyaudio 不行
尝试pip3 install -i /simple/ pyaudio 不行
解决： whl文件在python\Scripts下安装
/Sau_Hit/article/details/85938063
https://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
第三步、装之后
设置录音设备
不知道哪个设备，先打印出设备信息
import speech_recognition as sr
for index, name in enumerate(sr.Microphone.list_microphone_names()):
print("Microphone with name \"{1}\" found for `Microphone(device_index={0})`".format(index, name))
with sr.Microphone(sample_rate = rate, device_index = 1 ) as source:
找到之后加上
第一次不能识别speech，可能原因recognizer_instance.energy_threshold设置太高，尝试调小或者提前recognizer_instance.adjust_for_ambient_noise动态调整。
recognizer_instance.energy_threshold
recognizer_instance.pause_threshold
参考
/project/SpeechRecognition/1.2.1/
/project/SpeechRecognition/
/Uberi/speech_recognition/blob/c89856088ad81d81d38be314e3db50905481c5fe/speech_recognition/init.py
使用树莓派 Raspberry Pi board,
The recognizer
hangs on recognizer_instance.listen;
specifically, when it’s calling Microphone.MicrophoneStream.read.
This
usually happens when you’re using a Raspberry Pi board,
This causes the default microphone used by PyAudio to simply block when we try to read
it. need a USB sound card (or USB microphone). Once you do this, change all
instances of Microphone() to Microphone(device_index
= MICROPHONE_INDEX), where MICROPHONE_INDEX is the hardware-specific index of the microphone.
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