1. A computer-implemented error checking system, comprising: a duration component for computing word duration probability data based on a speech model, and a corpus of transcription data and wave data; a confidence component for computing a confidence score based on recognition processing of the speech model and wave data, and alignment output of the transcription data and the wave data; an error component for detecting error based on the duration probability data and the confidence score; and a training component for retraining the speech model based on removal of the error from the corpus.