Nacereddine Hammami

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This paper introduces a fast learning method for a graphical probabilistic model for discrete speech recognition based on spoken Arabic digit recognition by means of a new proposed spanning tree structure that takes advantage of the temporal nature of speech signal. The experimental results obtained on a spoken Arabic digit dataset confirmed that for the(More)
In this work we propose a novel method for automatic discrete speech recognition composed from two steps. In a first step, discrete speech features are extracted by means of Mel Frequency Cepstral Coefficients (MFCCs) followed by vector quantization (VQ). Then in a second step, the obtained features are fed to a Tree distribution classifier which provides(More)
This paper presents automatic recognition of the Spoken Arabic Digits recognition by means of preselected parameters for the Hidden Markov Models using the cross validation method. The experimental results give the best result with the obtained parameters, achieve 94.09% correct digit recognition dataset and confirm the promising capabilities of the(More)
Mel Frequency Cepstral Coefficients (MFCCs) are the most popularly used speech features in many speech and speaker recognition applications. In this paper, we study the effect of the second-order derivatives of MFCC on the recognition of the Spoken Arabic digits. The system was developed using the Hidden Markov Models (HMMs) and Tree distribution(More)
This paper proposes a new discrete speech recognition method which investigates the capability of graphical models based on tree distributions that are widely used in many optimization areas. A novel spanning tree structure that utilizes the temporal nature of speech signal is proposed. The proposed tree structure significantly reduces complexity in so far(More)
The spread of many infectious diseases recently has necessitated the need to monitor them. Therefore, we present an idea for developing an web-based analysis system that will be able to regularly collect news reports from Arabic newspaper websites, and then be able to extract information relating to disease outbreaks, e.g. disease name, date and location.(More)
In this paper, we investigate a new joint statistical model for text classification, which is copula functions, that is a way of formalizing dependence structures of random vectors. A copula is a distribution function with the implicit capacity to model nonlinear dependencies. Copula have been widely used in economics and finance and more recently it has(More)
Copula functions have been widely used in economics and finance and more recently it has been used in same field of pattern recognition. This paper presents an overview for introducing the use of Copulas function to supervised probabilistic classification applied to automatic speech recognition.
People with low or no visual ability must also be able to manipulate, operate and browse the electronic reading devices of the Quran by a simple use of the voice (operation known as Voice-In/Voice-Out). The main operations of navigation and exploration of these devices, as the movement between verses or between pages can be fully realized through a voice(More)