SYSTEM FOR EVALUATION OF PITCH LAG, VOICE CODING DEVICE, METHOD FOR EVALUATION OF PITCH LAG AND VOICE CODING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a device and method for evaluating the pitch lug value of an input voice by use of multiple resolution method. SOLUTION: This system comprise a step 602 of determining LPC residue of a voice and sampling the LPC residue. A discrete Fourier transform is applied thereto 604, and the result is squared 608. DFT is performed to the squared amplitude 610, and the LPC residual sample is transferred to another area. The initial pitch lug is determined with low resolution. After a low resolution pitch lug evaluation 614 is provided, precise algorithm is applied to provide a high resolution pitch lug. The precise algorithm is based on minimization of a predicted error in time band. The precise pitch lug 618 can be directly used in voice encoding.