Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)

The Acoustical Society of Korea (한국음향학회)
권호 표지

Improved MELP Coder Using Fourier Post Processing Compensation Method

퓨리에 후처리 보상 기법을 이용한 향상된 MELP 음성부호화기

  • Ko Bong-Ok (Div. of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim Chong-Kyo (Div. of Electronics and Information Engineering, Chonbuk National University)
  • 고봉옥 (전북대학교 전자정보공학부) ;
  • 김종교 (전북대학교 전자정보공학부)
  • Published : 2002.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents an improved MELP Coder using Fourier magnitude compensation method chosen the new 2.4 kbit/s U.S. federal Standard. Although the MELP is quite good, it has some distortion for low-pitch male speakers. An improved MELP coder includes a post processing for the fourier magnitude model that allows the MELP to reconstruct the lower frequency spectrum more accurately and improve the speech quality. In this new compensation algorithm, the harmonic magnitudes in the low frequencies are adaptively modified by removing the effect of the two filters. Also, the bit rate of the improved MELP coder is the same as that of the Federal Standard MELP coder. formal quality tests show that the improved MELP coder was preferred over the Federal Standard MELP coder by $80.8\%$.

Keywords