Kagamma/TPocketSphinx

Object Pascal binding for PocketSphinx - a lightweight speech recognition engine

TPocketSphinx

The minimal set of pocketpshinx (and sphinxbase) headers, translated to Object Pascal. Custom thread wrapper TPocketSphinx is capable of recognizing English speech live from a default audio source in Windows and Linux, call back with status and hypothesis if available.

Building examples

1. Demos: colors and anyword were designed in Lazarus (version 1.6.4 used). Demo anyword-delphi was tested in Delphi 10.2 Tokyo.

2. Linux only: pocketsphinx installation is explained in this tutorial. Basically ./configure and make install for sphinxbase and pocketsphinx (in this order).

3. Build any of the examples:
   examples\colors\PocketSphinxColors.lpi - Recognition of few words defined in grammar and dictionary files: black, blue, green, red, yellow, white. This demo will initialize very quickly and use minimum resources, since dictionary file contains only few words and search scope is limited to them.
   examples\anyword\PocketSphinxAnyWord.lpi - Recognition of any word from a US English dictionary (~135k words), in Ngram language model search mode.
   examples\anyword-delphi\PocketSphinxDelphi.dproj - Above demo but for Delphi

   If building in Lazarus for Linux, change build configuration respectively (Windows configuration is default).

4. Download and unpack latest pocketsphinx (pocketsphinx-5prealpha-win32.zip originally used).
   Copy files:

   • all files and subdirectories pocketsphinx\model\en-us to bin\en-us Windows:
   • pocketsphinx\bin\Release\Win32\pocketsphinx.dll to bin\pocketsphinx.dll
   • pocketsphinx\bin\Release\Win32\sphinxbase.dll to bin\sphinxbase.dll

5. Make sure your recording device is set to microphone in system, since examples make use of default audio device.

6. Execute built demo and speak. If PocketSphinx fails to initialize - rebuild demo with Debug configuration, ps.log file is created with full log.
   In Windows if you get an error: "missing MSVCR110D.DLL", try installing Microsoft Visual C++ 2012 Redistributable in your system.

Creating new grammar

Colors demo explains how to limit acceptable words via JSpeech Grammar Format file bin\colors\colors.gram
To create a new list of "accepted" words that can be used in your "command and control" type of application:

• Define words in grammar file, accordingly to your set of rules (words combine, repetitions etc.)
• Create dictionary file with all of those words, and their pronunciation with tools listed below
• Load dictionary and add new search with LoadDictionary and AddGrammarSearchFile

Multiple words to pronunciation (.dic) file	Single word to pronunciation
LOGIOS Lexicon Tool	The CMU Pronouncing Dictionary
http://www.speech.cs.cmu.edu/tools/lextool.html	http://www.speech.cs.cmu.edu/cgi-bin/cmudict

Make sure that words in your dictionary and grammar file are lowercase or uppercase for both (not mixed), otherwise PocketSphinx will fail to initialize.

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License

MIT