Build Instructions

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• 1

  Setup off-line speech recognition

  Now there are fewer and fewer open source speech recognition modules, and the test results are not ideal. The latest one that can be found is vosk, but vosk does not support raspberry pie 0. Finally, I chose Speechrecogonition + pocketsphinx as the solution for offline speech recognition. In order to ensure the recognition success rate, after several rounds of tests, I chose "my good friend" as the wake-up word, and made a special recognition file. You can also choose your favorite wake-up words. The only suggestion is to consider the recognition success rate.

  现在开源语音识别模块越来越少，而且经过测试效果并不理想。能够找到的最新的是VOSK，但是VOSK不支持树莓派0。最终我选择 Speechrecogonition + pocketsphinx作为离线语音识别的解决方案。为了确保识别成功率，经过多轮测试，我选择“My Good Friend”作为唤醒词，并且制作了专门的识别文件。你也可以选择你喜欢的唤醒词，唯一的建议就是考虑一下识别成功率。

• 2

  Regiest Baidu AI

  In the field of cloud computing, I choose Baidu AI Open Platform as the basis. Baidu AI provides many aspects of cloud service support, such as voice, image, text, map, translation, etc. Baidu AI not only supports Chinese, but also other languages such as English. So you can use Baidu AI directly if you like.
  

  在云计算领域，我选择百度AI开放平台作为基础。百度AI提供了很多方面的云服务支持，比如，语音、图像、文字、地图、翻译等。百度AI不仅支持中文，也支持英文等其它语言。所以如果你愿意，也可以直接使用百度AI。

  Before using Baidu AI, you need to register users, create applications, and then add the AI services you need to your applications. Record the APPID, API_KEY, and SUCRETY_KEY of your applications and use them later.

  使用百度AI前，需要先注册用户，创建应用然后将你需要的AI服务加入到你的应用中。记录好应用的APPID、API_KEY和SECURTY_KEY，在后面将会用到它们。

  Baidu AI can be invoked using HTTP or directly using SDK provided by Baidu.

  百度AI可以使用HTTP的方式调用，也可以直接使用百度提供的SDK进行调用。

  For testing purposes only, most of Baidu AI APIs offer free trials from half a year to one year.

  如果仅仅为了测试，百度AI大多数API提供了半年到一年的免费试用。
  

• 3

  Record voice

  There are two ways to record a sound: one is to trigger the recording by means of buttons, and the other is to record it fully automatically. Because I chose the full voice control mode, I chose the latter.

  录音有两种方式：一种是通过按钮等方式去触发录音；另一种方式是全自动录音。因为我选择的是全语音控制模式，所以我选择的是后一种方式。

  The key to automatic recording is when to start recording and when to end recording. The strategy used is to set a threshold based on the volume of the sound read through pyaudio to determine when to start and end.

  自动录音的关键是何时开始录音和何时结束录音。使用的策略是根据通过pyaudio读取到的声音的音量来设置阈值，用来确定何时开始和结束。

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