디지털융복합연구 (Journal of Digital Convergence)

  • 제13권7호
  • /
  • Pages.177-182
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  • 2015
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  • 2713-6434(pISSN)
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  • 2713-6442(eISSN)
한국디지털정책학회 (The Society of Digital Policy and Management)
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융복합 시스템의 8kbps에 있어서 APC-MPC에 관한 연구

A Study on APC-MPC in 8kbps of Convergence System

  • 이시우 (상명대학교 정보통신공학과)
  • Lee, See-Woo (Dept. of Information and Telecommunication Engineering)
  • 투고 : 2015.04.21
  • 심사 : 2015.07.20
  • 발행 : 2015.07.28
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초록

유성음원과 무성음원을 사용하는 멀티펄스 음성부호화 방식(MPC)에 있어서, 유성음의 파형에서 일그러짐이 발생한다. 이러한 문제를 해결하기 위해, 재생파형의 일그러짐이 감소하도록 피치구간 마다 멀티펄스의 진폭과 위치를 보정하는 APC-MPC를 제안하였다. 또한 융복합 시스템의 8kbps 부호화 조건에서 APC-MPC의 SNRseg를 검토하고 부호화 시스템으로 구현하였다. APC-MPC의 SNRseg를 평가한 결과, APC-MPC의 남자음성에서 14.3dB, 여자음성에서 13.9dB 임을 확인할 수 있었다. 본 방법은 셀룰러폰이나 스마트폰과 같이 Low Bit Rate의 음원을 사용하여 음성신호를 부호화하는 방식에 활용할 수 있을 것으로 기대된다.

In a MPC(Multi-Pulse Coding) using excitation source of voiced and unvoiced, it would be a distortion of voice waveform. This is caused by normalization of synthesis speech waveform of voiced in the process of restoration. To solve this problem, this paper present APC-MPC of amplitude-position compensation in a multi-pulses each pitch interval in order to reduce distortion of synthesis waveform. Also, I was implemented that the APC-MPC in coding system. And I evaluate the SNRseg of APC-MPC in 8kbps coding condition of convergence system. As a result, SNRseg of APC-MPC was 13.9dB for female voice and 14.3dB for male voice respectively. And so, I expect to be able to this method for cellular phone and smart phone using excitation source of low bit rate.

키워드

참고문헌

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