Speech signal has both voiced and unvoiced portions, but focussing on transition occurs in the voicing portion alone, In the voicing regions the source is almost constant and transition occurs due to time varying nature of system that is source is time invariant & vocal tract system is time variant.
Ahmad Hassanat
do you mean voice activity detection?
voice detection is not speech recognition. but it might be used as a pre-process for speech recognition.
for more info about voice activity detection: a good start might be at: http://en.wikipedia.org/wiki/Voice_activity_detection
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Thomas Braunschweig
I think, you have to detect both, voicing level of speech signal and unvoiced portions and the time depency of the transition.
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