A study on pitch detection using the local peak and valley for Korean speech recognition

The authors studied pitch detection using the local peaks and valleys for Korean speech recognition. To reduce data for detecting peaks and valleys, a center-clipping technique was adopted. The modified equation to detect peaks and valleys reduced double pitch-error and two times decimation reduced half-pitch error. The first decimation was detection of the local peaks and valleys. The second decimation was to get rid of small peaks and valleys which were not real peaks and valleys. For the experiments, the detection algorithm was developed and applied to the Korean number system