Method and apparatus for measuring confidence about speech recognition in speech recognizer

The present invention relates to a method and apparatus for the compared phoneme heat change position according to the state change position and the speech recognition result to the speech signal input from the speech recognizer using the difference and the likelihood ratio measure the reliability of the speech recognition will be. The present invention changes the in the speech recognizer and comprising the steps of: detecting the state change position for the audio signal, the method comprising: detecting a change in a phoneme column position in accordance with a result of voice recognition of the voice signal and the detected change of state positions of the detected phoneme column using the difference in position and provides a reliable measuring method comprising the step of calculating the reliability of the speech recognition. According to the present invention, it can show a more reliable measurement performance by using the heat of comparing the phoneme change position and change of state positions of the audio signal according to the speech recognition result of the speech recognition result and the likelihood ratio at the same time. Voice recognition, spectrogram, reliability, calculation