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

개선된 혼성영역 교차상관법에 의한 G.723.1의 피치검색시간 단축에 관한 연구

  • 조왕래 (숭실대 공대 정보통신공학과) ;
  • 최성영 (한국폴리텍2대학 전자과) ;
  • 배명진 (숭실대 정보통신공학과)
  • Received : 2009.10.27
  • Accepted : 2010.07.14
  • Published : 2010.12.01

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

References

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