| Title |
A Study on the Pitch Search Time Reduction of G.723.1 Vocoder by Improved Hybrid Domain Cross-correlation |
| Authors |
조왕래(Jo, Wang-Rae) ; 최성영(Choi, Seong-Young) ; 배명진(Bae, Myung-Jin) |
| Keywords |
CELP ; G.723.1 ; Open-loop pitch estimation ; Cross-correlation ; Bit-reversing |
| Abstract |
In this paper we proposed a new algorithm that can reduce the open-loop pitch estimation time of G.723.1. The time domain cross-correlation method is simple but has long processing time by recursive multiplication. For reduction of processing time, we use the method that compute the cross-correlation by multiplying the Fourier value of speech by it's complex conjugate. Also, we can reduce the processing time by omitting the bit-reversing of FFT and IFFT for time-frequency domain transform. As a result, the processing time of improved hybrid domain cross-correlation algorithm is reduced by 67.37% of conventional time domain cross-correlation. |