1. A method for detecting boundary of at least two co-articulated units from at least one isolated speech segment comprising: storing at least one speech signal in at least one vector; defining at least one time window and one or more recurrence plot parameters for the stored vector ; calculating, via a processor, at least one recurrence matrix for the defined time window; shifting the time window for the stored vector; finding at least one similarity between successive recurrence matrixes based on a suitable distance measure; generating at least one similarity score for similarity between the successive recurrence matrixes; and flagging at least one similarity score with at least one type of coarticulated boundary.