1. A system configured to identify a lexical segment in speech, the system comprising: an input interface configured to receive an input of audio; a divider module configured to divide the input of audio into blocks; an energy calculation module configured to calculate energy of the audio over a first and second time intervals of the audio; an energy ratio calculation module configured to calculate the ratio of the energy in the first time intervals of the audio over every second time interval within the first time intervals that slides as the energy calculation module calculates the energy of the audio at each of the first time intervals; a silence boundary locator module configured to determine transitions between silence and non-silence according to the ratio of the energy calculated by the energy ratio calculation module. a first kurtosis calculation module configured to calculate the kurtosis of the audio signal over a third time interval that slides as the kurtosis calculation module calculates the kurtosis of the audio at each of the third time intervals; a segment classification module configured to classify the audio in every third time interval according to the kurtosis of the input audio within each third time interval; a second kurtosis calculation module configured to calculate kurtosis of the input audio over each fourth time interval that slides as the second kurtosis calculation module calculates the kurtosis of the audio at each fourth time interval; a zero cross calculation module configured to calculate zero crossings of the audio within a fourth time interval; a silence ratio calculation module configured to calculate the silence ratio of audio with a fourth time interval; an individual block calculation module configured to classify the audio within a fourth time interval according to the second kurtosis calculation module, the zero crossing calculation module, the silence ratio calculation module, and the energy of the fourth time interval; a weighted average calculation module configured to calculate the weighted average of the kurtosis, zero cross rate, silence ratio and energy over the fourth time interval; a preliminary decision module configured to make a preliminary classification of the audio within the segment; and a polling module configured to make a final classification of the audio within the segment.