On a fast pitch searching by using a simple correlation technique in the CELP vocoder
Myung-Jin Bae, Hwe Yoong Whang, Hah Young Yoo · 2002
Code Excited Linear Prediction (CELP) speech coders exhibit good performance at data rates below 4.8 kbps. The major drawback of CELP type coders is the requirement of a lot of computation. In this paper, we propose a new pitch search method that preserves the quality of CELP vocoder with reduced complexity. In the pitch searching, we detect the preliminary pitches of high correlation using a simple correlation technique, and then carry out the pitch searching only for the preliminary pitches. By the proposed method, we can get approximately 77% complexity reduction with 0.8 dB SNR degradation on average due to the pitch search.