The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
권호 표지
DOI QR코드

DOI QR Code

Improvement of the TCX Module in AMR-WB+ Codec Using Pyramid VQ

Pyramid VQ를 이용한 AMR-WB+ 코덱 내 TCX 모듈의 성능 개선

  • 박상국 (한양대학교 전자컴퓨터공학부) ;
  • 박정은 (한양대학교 전자컴퓨터공학부) ;
  • 백승권 (전자통신연구원) ;
  • 서정일 (전자통신연구원) ;
  • 강상원 (한양대학교 전자컴퓨터공학부)
  • Published : 2007.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we Propose a pyramid VQ to quantize the transform coefficients of TCX module for the audio improvement of AMR-WB+ codec. The Proposed pyramid VQ is compared to the $RE_8$ Lattice VQ used in the AMR-WB+ standard codec. demonstrating improvement 4% and 5.7%. respectively, in Mean Squared Error (MSE) and 3.3% and 4.7%. respectively, in Perceptual Evaluation of Audio Quality (PEAQ) by 8-dimensional and 16-dimensional Pyramid VQ.

본 논문은 AMR-WB+ 코덱의 오디오 품질을 개선하기 위하여 TCX모듈 변환계수 양자화기에 8차 및 16차 Pyramid VQ방식을 제안하였다. 제안된 Pyramid VQ 방식은 AMR-WB+ 코덱에 적용된 $RE_8$ Lattice VQ 방식과 비교 평가되었으며, 8차 및 16차 Pyramid VQ 방식의 사용시 Mean Squared Error (MSE)는 각각 4% 및 5.7% 개선되었고, Perceptual Evaluation of Audio Quality(PEAQ) 값은 각각 3.3% 및 4.7% 개선되었다.

Keywords

References

  1. Thomas R. Fischer, 'A Pyramid Vector Quantizer,' IEEE Trans. Information Thsory. IT-32 (4) 568-583, July 1986
  2. J. D. Gibson and K. Ssyood, 'Lattice Quantization,' Adv. Electron. Phvs., 72, 259 - 331, 1988
  3. S. RAGOT, B. BESSETTE, and R. LEFEBVRE, 'Low-cornolexity multi-rate lattice vector Quantization with application to wideband TCX speech coding at 32 kbit/s,' Proc. ICASSP, 2004, 2004: 1, l - 501-504
  4. 3GPP TS 26.290, 'Extended AMR wideband codec: Transcoding Functions.'
  5. W. A. Finamore, W. A. Pearlina, 'Optimal Encoding of Discrete-Time Continuous-Amplitude Memoryless source with Finite Output Alphabets,' IEEE Trans. Inform. Theory, IT-26, 144-155, Mar. 1980
  6. T. R. Fischer and R. M. Dicharrv, 'Vector quantizer design for memoryless Gaussian, gamma, andiaplacian sources,' IEEE Trans. Commun., COM-32 , nn. 1065-1069, Sep. 1984