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Project of off-line speech recognizing. On the basis of library pocketsphinx (static assembly).

The basis of the project is dynamic library SpeechRecognizer (SpeechRecognizer->lib->dynamic).

Library SpeechRecognizer has been created for future integration to the projects on Unity 5 by means of using wrapper (connector) UnitySpeechRecognizer (https://github.com/MimusTriurus/UnitySpeechRecognizer ).

Application for demonstration of speech recognizing: VoiceRecognition (SpeechRecognizer->app).

System requirements:

  1. ОС: Windows(x86, x64), Ubuntu 16.04(x86, x64), Raspbian;
  2. Qt 5.5.1 or higher;
  3. Compiler with support for c++ 11 (MSVC2013 on Windows);
  4. Microphone.

Setup for Windows:

  1. Clone the repository;
  2. If required – setup compilation flag – j*, where “*” is the number of cores being used in the process of compilation;
  3. Build main project SpeechRecognizer;
  4. Download files of acoustic model https://cloud.mail.ru/public/74Jz/ifWwr2p2r and expand compressed files to the folder with executive file VoiceRecognition.exe.

Setup for Linux:

  1. Clone the repository;
  2. Install library libasound2-dev by keying in in the console command “sudo apt-get install libasound2-dev” (so that pocketsphinx used Alsa, not pulseaudio by default);
  3. If required – setup compilation flag – j*, where “*” is the number of cores being used in the process of compilation;
  4. Build main project SpeechRecognizer;
  5. Download files of acoustic model https://cloud.mail.ru/public/74Jz/ifWwr2p2r and expand compressed files to the folder with executive file VoiceRecognition.

Setup for Raspbian:

  1. Create swap file (size 1 Gb) following the steps as below: a) open the file by keying in in the console command “sudo nano /etc/dphys-swapfile”; b) change the value CONF_SWAPSIZE to 1024; c) save the file by pressing [Ctrl+O], then press [Enter] to confirm and press [Ctrl+X].
  2. Clone the repository;
  3. Install library libasound2-dev by keying in in the console command “sudo apt-get install libasound2-dev” (so that pocketsphinx used Alsa, not pulseaudio by default);
  4. If required – setup compilation flag – j*, where “*” is the number of cores being used in the process of compilation;
  5. Build main project SpeechRecognizer;
  6. Download files of acoustic model https://cloud.mail.ru/public/74Jz/ifWwr2p2r and expand compressed files to the folder with executive file VoiceRecognition.

Remarks:

  1. For static assembly of libraries pocketsphinx command “make” is to be executed with flag CFLAGS="-static";
  2. For setup of compiled libraries it is required to execute command in the console “make install DESTDIR=”;
  3. Test application VoiceRecognition and library SpeechRecognizer are located in folder “bin”;
  4. So that application VoiceRecognition could work with a certain microphone it is required to start the program with parameter "-adcdev hw:0,0" ( where hw:0,0 – identifier of the microphone. For example, “hw:1,0” for microphone of usb web-camera on raspberry ), otherwise default device will be used;
  5. To improve the quality of recognition it is required to tune the microphone in such a way, so that it sensed as little back-ground noise as possible.