The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Efficient TTS Database Compression Based on AMR-WB Speech Coder

AMR-WB 음성 부호화기를 이용한 TTS 데이터베이스의 효율적인 압축 기법

  • 임종욱 (세종대학교 정보통신공학과) ;
  • 김기출 (세종대학교 정보통신공학과) ;
  • 김경선 ((주)에이치씨아이랩) ;
  • 이항섭 (세종대학교 정보통신공학과) ;
  • 박혜영 ((주)에이치씨아이랩) ;
  • 김무영 (세종대학교 정보통신공학과)
  • Published : 2009.04.30
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Abstract

This paper presents an improved adaptive multi-rate wideband (AMR-WB) algorithm for the efficient Text-To-Speech (TTS) database compression. The proposed algorithm includes unnecessary common bit-stream (CBS) removal and parameter delta coding combined with speaker-dependent huffman coding to reduce the required bit-rate without any quality degradation. We also propose lossy coding schemes to produce the maximum bit-rate reduction with negligible quality degradation. The proposed lossless algorithm including CBS removal can reduce bit-rate by 12.40% without quality degradation compared with the 12.65 kbps AMR-WB mode. The proposed lossy algorithm can reduce bit-rate by 20.00% with 0.12 PESQ degradation.

본 논문에서는 효율적으로 Text-To-Speech (TTS) 데이터베이스를 압축하기 위해서 개선된 adaptive multi-rate wideband (AMR-WB) 음성 부호화 알고리즘을 제안하고자 한다. 제안된 알고리즘은 불필요한 common bit-stream (CBS)을 제거하고, 파라미터의 델타 코딩 방식과 특정 화자에 종속적인 Huffman coding을 접목하여 음질 저하 없이 비트율을 낮추고자 하였다. 또한, 최소한의 음질 손실로 최대의 비트율 개선 효과를 볼 수 있는 손실 압축 방식도 제안하였다. 기존의 12.65 kbit/s AMR-WB 코덱에 CBS 제거를 포함한 무손실 압축 방식을 적용한 결과 음질 저하 없이 최대 12.40%의 비트율 개선 효과를 나타냈다. 또한, 손실 압축방식에서는 20.00% 비트율 개선 시 PBSQ로 0.12 정도의 음질 저하가 발생했다.

Keywords

References

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