linguist module in sphinx 4 by sonthi dusitpirom
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Linguist Module in Sphinx-4 By Sonthi Dusitpirom. Objective. How to change dictionary in Sphinx-4. Sphinx-4 .

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  • How to change dictionary in Sphinx-4
sphinx 4
  • Sphinx-4 is an open source framework for speech recognition, written in the Java programming to help in the research of speech recognition system. In Sphinx-4 it has 3 main components
    • The FrontEnd
    • The Decoder
    • The Linguist
sphinx 42
  • In this project we focus on the Linguist componentthat has 3 subcomponents
    • The Acoustic Model
      • Acoustic model is pronounced of individual characters, known as phonemes.
    • The Dictionary
      • Dictionary is the pronunciation of all the words that the system can recognize.
    • The Language Model
      • Language model describes how the grammar looks like.
acoustic model
Acoustic Model
  • The acoustic model in Sphinx-4 consists of a set of left-to-right Hidden Markov Models for basic sound units. The units represent phones in a triphone context.
  • The acoustic model in Sphinx-4 is packed in JAR file. The advantage of packing it in a JAR file is that the file can be included in the classpath and referenced in the configuration file for it to be used in a Sphinx-4 application.
acoustic model1
Acoustic Model
  • In sphix-4 we have two important models that are for difference purpose
    • TIDIGITS_8gau_13dCep_16k_40mel_130Hz_6800.jar is designed and created for number. If you need to recognize number then you should use this model
    • WSJ_8gau_13dCep_16k_40mel_130Hz_6800.jar is designed and created for text. If you want to recognize text then you should use this model.
  • Dictionary provides pronunciations for words found in the language model. The pronunciations split words into sequences of phonemes that found in the acoustic model.
language model
Language Model
  • There are two types of model that describe language
    • Grammars language model
      • Grammars describe very simple types of languages for command and control, and you are written by hand or generated automatically with plain code.
    • Statistical language model
      • Statistical language model estimate the probability of the distribution of natural language. The most widely used statistical language model is N-gram
create a new dictionary
Create a new dictionary
  • In Sphinx-4 we already have a dictionary. This is the way to change dictionary
    • Extract WSJ_8gau_13dCep_16k_40mel_130Hz_6800Hz.jar in lib directory.
    • Go to dict folder and open cmudict.0.6.d file in that folder.
    • Insert words and phonemes into cmudict.0.6d file and save.
    • Zip the folder that we extract in zip file.
    • Remove WSJ_8gau_13dCep_16k_40mel_130Hz_6800Hz.jar from libraries in build path and add zip file into libraries in build path.
xml configuration file
XML Configuration File
  • The configuration of a particular Sphin-4 system is determined by a configuration file. This configuration file defines the following
    • The names and types of all of the components of the system.
    • The connectivity of these components – that is, which components talk to each other.
    • The detailed configuration for each of these elements.
xml configuration file1
XML configuration File
  • Determining which components are to be used in the system.
  • Determining the detailed configuration of each of these components.
use model in sphinx 4
Use Model in Sphinx-4
  • There are three steps to use new model from Sphinx-4
    • Defining a language model.
    • Defining a dictionary.
    • Defining an acoustic model.
define a language model
Define a Language Model

<component name="jsgfGrammar" type="edu.cmu.sphinx.jsapi.JSGFGrammar">

<property name="grammarLocation“

value=" the path to the grammar folder "/>

<property name="dictionary"


<property name="grammarName"

value=“the name of grammar"/>

<property name="logMath“



define a language model1
Define a Language Model

<component name="trigramModel" type="edu.cmu.sphinx.linguist.language.ngram.large.LargeTrigramModel">

<property name="unigramWeight“


<property name="maxDepth"


<property name="logMath"


<property name="dictionary"


<property name="location"

value="the name of the language model file"


define a dictionary
Define a Dictionary

<component name="dictionary" type="edu.cmu.sphinx.linguist.dictionary.FastDictionary"> <property name="dictionaryPath"

value="the name of the dictionary file"

<property name="fillerPath" />

value="the name of the filler file"/>

<property name="addSilEndingPronunciation" value="false"/>

<property name="allowMissingWords"


<property name="unitManager"



define an acoustic model
Define an Acoustic Model

<component name="sphinx3Loader" type="edu.cmu.sphinx.linguist.acoustic.tiedstate.Sphinx3Loader">

<property name="logMath" value="logMath"/>

<property name="unitManager" value="unitManager"/> <property name="location"

value="the path to the model folder"/>

<property name="location"

value="the path to the model folder"/>


<component name="acousticModel" type="edu.cmu.sphinx.linguist.acoustic.tiedstate.TiedStateAcousticModel">

<property name="loader" value="sphinx3Loader"/>

<property name="unitManager" value="unitManager"/>