Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on the ECM(Echo Cancelling Method) Design for Digital Transmission over the Two-Hire Loops

2선 선로에 Digital 전송을 위한 ECM(Echo Cancelling Method) 설계에 관한 연구

  • Lim, C.S. (Dept. of Electronics Eng., Ajou University) ;
  • Chung, H.C. (Electronics and Telecommunications Research Institute) ;
  • Kim, Y.K. (Dept. of Electronics Eng., Ajou University) ;
  • Lee, H.S. (Dept. of Electronics Eng., Ajou University)
  • 임춘성 (아주 대학교 전자 공학과) ;
  • 정희창 (한국 전자 통신 연구소) ;
  • 김영길 (아주 대학교 전자 공학과) ;
  • 이행세 (아주 대학교 전자 공학과)
  • Published : 1987.07.03
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Abstract

This paper describes the design of echo cancslling method(ECM) for transmission with full-duplex which ie transmitted on "2B+D"(144kbps)data through two-wire loop plants. The design objective is 40dB attenuation with a signal-to-noise ratio of $10{\sim}20dB$. Since the transhybrid loos can be as low as $6{\sim}10dB$, the required attenuation of the echo signal is on the order of $50{\sim}55dB$. The used algorithms based on the sign algorithm, and have been improved by using adoptive reference voltage level algorithm.

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