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Submitted on: 05 September 2011.
Revised on: 04 December 2011.
Accepted on: 17 December 2011.
___________________EURASIP Journal on Audio Speech and Music Processing
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Submitted on: 27 August 2007.
Revised on: 02 December 2007.
Accepted on: 25 January 2008.
___________________EURASIP Journal on Audio Speech and Music Processing