The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지
DOI QR코드

DOI QR Code

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
Download PDF
⟨ Previous Next ⟩

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

  1. ITU-T Recommendation G.723.1, 2006. 5.
  2. Embree, Paul M. & Bruce Kimble, C Language Algorithms for Digital Signal Processing, Prentice-Hall, 1991.
  3. Wangrae Jo, Jongkuk Kim, Myungjin Bae, "A Study on Pitch Detection in Time-Frequency Hybrid Domain," Springer-Verlag, Lecture Notes in Computer Science, Vol.-LNCS3406, pp.437-440, February 2005.
  4. 민소연, 정현욱, 배명진, "CELP 보코더에서 델타 피치 검색 방법 개선에 대한 연구," 2004년도 대한전자공학회 하계종합학술대회 논문집, Vol.27, No.1(s), pp.1181-1184, 2004년 6월.
  5. 정익주, "실시간 디지털 신호처리," 생능출판사, 2006.
  6. 미카미나오키(송봉길 역), C언어에 의한 디지털 신호처리 입문, 성안당, 2006.