| 摘要 |
PROBLEM TO BE SOLVED: To provide the pitch detecting method which can perform high- precision pitch detection for a speech signal which has intenser autocorrelation in half pitch and double pitch than in pitch to be detected, and the method and device for speech signal encoding to which the pitch detecting method is applied. SOLUTION: A voiced/voiceless sound decision for an input speech signal is made and for a voiced sound part, a sine wave analytic encoding means 114 obtains an encoding output, and for a voiceless sound part a code exciting linear predictive encoding method 120 obtains it. At this time, the since wave analytic encoding means 114 makes a pitch search for finding pitch information from the input speech signal and sets high-reliability pitch information according to the detected pitch information, etc., a determine a pitch detection result by using the said high-precision pitch information and the voiced/voiceless sound decision result of a frame other than the current frame. |
