This code is used to remove silence from a voice signal so that the recognition in voice recognition will give good result. The method is Scale on threshold applied to the envelope for detecting scilence periods. The actual threshold is computed by multiplying threshin" by the median value of the envelope samples. The default is (.25), whichis 25 of the median envelope value over input signal .-This code is used to remove silence from a voice signal so that the recognition in voice recognition will give good result. The method is　Scale on threshold applied to the envelope for detecting scilence periods. The actual threshold is computed by multiplying　threshin" by the median value of the envelope samples. The default is (.25), whichis 25 of the median envelope value over input　signal .