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http://dx.doi.org/10.5370/KIEE.2010.59.12.2324

A Study on the Pitch Search Time Reduction of G.723.1 Vocoder by Improved Hybrid Domain Cross-correlation  

Jo, Wang-Rae (숭실대 공대 정보통신공학과)
Choi, Seong-Young (한국폴리텍2대학 전자과)
Bae, Myung-Jin (숭실대 정보통신공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.59, no.12, 2010 , pp. 2324-2328 More about this Journal
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.
Keywords
CELP; G.723.1; Open-loop pitch estimation; Cross-correlation; Bit-reversing;
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