A Study on the Estimation of Glottal Spectrum Slope Using the LSP (Line Spectrum Pairs)

LSP를 이용한 성문 스펙트럼 기울기 추정에 관한 연구

  • 민소연 (서일대학 정보기술계열 정보통신) ;
  • 장경아 ((주)코아로직 소프트웨어실 AT팀)
  • Published : 2005.12.01


The common form of pre-emphasis filter is $H(z)\;=\;1\;- az^{-1}$, where a typically lies between 0.9 and 1.0 in voiced signal. Also, this value reflects the degree of filter and equals R(1)/R(0) in Auto-correlation method. This paper proposes a new flattening algorithm to compensate the weaked high frequency components that occur by vocal cord characteristic. We used interval information of LSP to estimate formant frequency. After obtaining the value of slope and inverse slope using linear interpolation among formant frequency, flattening process is followed. Experimental results show that the proposed algorithm flattened the weaked high frequency components effectively. That is, we could improve the flattened characteristics by using interval information of LSP as flattening factor at the process that compensates weaked high frequency components.