使用 snowboy 配置多个热词唤醒_snowboy 几个汉字的唤醒 识别率高 能耗低

实验环境：荔枝派zero 代码：使用python3代码

snowboy 是一个开源的、轻量级语音唤醒引擎，可以通过它很轻松地创建属于自己的类似“hey, Siri” 的唤醒词。它的主要特性如下：

高度可定制性。可自由创建和训练属于自己的唤醒词 始终倾听。可离线使用，无需联网，保护隐私。精确度高，低延迟 轻量可嵌入。耗费资源非常低（单核
700MHz 树莓派只占用 10% CPU） 开源跨平台。开放源代码，支持多种操作系统和硬件平台，可绑定多种编程语言
详细看了官网提供的安装配置教程（已经很久没更新，有点过于繁琐了），几番尝试之后，感觉下面的介绍算是最新也相对最简单的方法了吧。

PS：只针对 Linux 系统（包含树莓派），其他平台可参考 Github

1、从Git获取snowboy源码

获取源代码：$ git clone https://github.com/Kitt-AI/snowboy.git
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2、安装相关依赖

安装 PyAudio：$ sudo apt-get install python3-pyaudio
安装 PyAudio：$ sudo apt-get install sox
安装 SWIG（>3.0.10)：$ sudo apt-get install swig
安装 ATLAS：$ sudo apt-get install libatlas-base-dev
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3、编译源代码

安装： cd snowboy ；python3 setup.py install
编译 Python3 绑定：$ cd snowboy/swig/Python3 && make

4、测试

官方源代码使用 Python3 测试有报错，经测试需修改 snowboy/examples/Python3 目录下的 snowboydecoder.py 文件。
将第 5 行代码 from * import snowboydetect 改为 import snowboydetect 即可直接运行。

#使用自己训练的‘’小白‘’模型
 python3 demo.py resources/models/xiaobai.pmdl
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运行如下：

 root@ubuntu:/yangfeiwu/sonwboy/examples/Python3# python3 demo.py resources/models/xiaobai.pmdl
Listening... Press Ctrl+C to exit
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to create IPC semaphore
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:40:54
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:40:57
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:40:58
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:41:07
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:41:11
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:51:18
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成功识别会输出如下信息：
INFO:snowboy:Keyword 1 detected at time: 2020-03-09 05:40:54

5、多个模型和回调

demo2.py演示了如何同时监听多个模型:

import snowboydecoder
import sys
import signal

interrupted = False


def signal_handler(signal, frame):
    global interrupted
    interrupted = True


def interrupt_callback():
    global interrupted
    return interrupted

if len(sys.argv) != 3:
    print("Error: need to specify 2 model names")
    print("Usage: python demo.py 1st.model 2nd.model")
    sys.exit(-1)

models = sys.argv[1:]

# capture SIGINT signal, e.g., Ctrl+C
signal.signal(signal.SIGINT, signal_handler)

sensitivity = [0.5]*len(models)
detector = snowboydecoder.HotwordDetector(models, sensitivity=sensitivity)
callbacks = [lambda: snowboydecoder.play_audio_file(snowboydecoder.DETECT_DING),
             lambda: snowboydecoder.play_audio_file(snowboydecoder.DETECT_DONG)]
print('Listening... Press Ctrl+C to exit')

# main loop
# make sure you have the same numbers of callbacks and models
detector.start(detected_callback=callbacks,
               interrupt_check=interrupt_callback,
               sleep_time=0.03)

detector.terminate()
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