Journal of the Korean Institute of Telematics and Electronics S (전자공학회논문지S)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Quality Assessment of Telephone Speech with ATM Circuit Emulation Services

ATM 망을 통한 Circuit Emulation 서비스에서 전화음성의 품질평가

  • Cho, Young-Soon (School of Electronic and Electrical Engineering, Kyunpook National Univeristy) ;
  • Seo, Jeong-Wook (School of Electronic and Electrical Engineering, Kyunpook National Univeristy) ;
  • Bae, Keun-Sung (School of Electronic and Electrical Engineering, Kyunpook National Univeristy)
  • 조영순 (慶北大學校 電子電氣工學部) ;
  • 서정욱 (慶北大學校 電子電氣工學部) ;
  • 배건성 (慶北大學校 電子電氣工學部)
  • Published : 1998.06.01
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Abstract

The ATM network provides ATM CES(Circuit Emulation Services) with AAL1 for CBR(constant bit rate) services such as telephone speech. In this study, quality assessment of telephone speech with CES over ATM was performed and discussed. For this, interoperability between ATM network and structured/unstructured DS1 link was modeled for simulation. And for qualiy assessment of telephone speech, SNR and MOS were used as an objective and a subjective measure, respectively. Experimental results have shown that MOS score 4 as well as SNR 30dB could be obtained at CLR of $10^{-3}$ or below for speech signal.

ATM 망에서는 전화서비스와 같은 CBR(Constant Bit Rate) 음성을 처리하기 위해서 AAL1 CES(Circuit Emulation Service)를 제시하고 있다. 본 논문에서는 ATM 망에서 CES를 이용한 전화서비스를 할 경우에 ATM 망의 셀 손실률에 따른 전화음성의 품질평가 실험을 하였다. 이를 위해 structured/unstructured DS1 구조의 ATM 망을 모델링 하였으며, 전화음성의 품질평가 실험에서 객관적인 품질평가로는 SNR을 주관적인 품질평가 방법인 MOS를 사용하였다. 시뮬레이션 결과 ATM CES에서 셀 손실률이 $10^{-3}$ 이하일 경우 MOS 4.0, SNR 30dB 이상의 양호한 음질을 얻을 수 있음을 보였다.

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