70,301 research outputs found
Fuzzy GMM-based Confidence Measure Towards Keywords Spotting Application
The increasing need for more natural human machine interfaces has generated intensive
research work directed toward designing and implementing natural speech
enabled systems. The Spectrum of speech recognition applications ranges from understanding
simple commands to getting all the information in the speech signal
such as words, meaning and emotional state of the user. Because it is very hard to
constrain a speaker when expressing a voice-based request, speech recognition systems
have to be able to handle (by filtering out) out of vocabulary words in the users
speech utterance, and only extract the necessary information (keywords) related to
the application to deal correctly with the user query. In this thesis, we investigate
an approach that can be deployed in keyword spotting systems. We propose a confidence
measure feedback module that provides confidence values to be compared
against existing Automatic Speech Recognizer word confidences. The feedback
module mainly consists of a soft computing tool-based system using fuzzy Gaussian
mixture models to identify all English phonemes. Testing has been carried out
on the JULIUS system and the preliminary results show that our feedback module
outperforms JULIUS confidence measures for both the correct spotted words and
the falsely mapped ones. The results obtained could be refined even further using
other type of confidence measure and the whole system could be used for a Natural
Language Understanding based module for speech understanding applications
Personalized Fuzzy Text Search Using Interest Prediction and Word Vectorization
In this paper we study the personalized text search problem. The keyword
based search method in conventional algorithms has a low efficiency in
understanding users' intention since the semantic meaning, user profile, user
interests are not always considered. Firstly, we propose a novel text search
algorithm using a inverse filtering mechanism that is very efficient for label
based item search. Secondly, we adopt the Bayesian network to implement the
user interest prediction for an improved personalized search. According to user
input, it searches the related items using keyword information, predicted user
interest. Thirdly, the word vectorization is used to discover potential targets
according to the semantic meaning. Experimental results show that the proposed
search engine has an improved efficiency and accuracy and it can operate on
embedded devices with very limited computational resources
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