대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)

대한전기학회 (The Korean Institute of Electrical Engineers)
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화상 전화용 음성 보코더의 실시간 구현

Real-Time Implementation of Speech Vocoder For Video Telephony

  • 남일룡 (단국대학교 전기공학과) ;
  • 서성대 (단국대학교 전기공학과) ;
  • 남현도 (단국대학교 전기공학과)
  • Nam, Il-Ryong (Dept. of Electrical Engineering, DanKook University) ;
  • Seo, Sung-Dae (Dept. of Electrical Engineering, DanKook University) ;
  • Nam, Hyun-Do (Dept. of Electrical Engineering, DanKook University)
  • 발행 : 1998.07.20
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초록

This paper presents real-time implementation of speech vocoder for PSTN video telephony using ITU G.723 16Kbps ADPCM algorithm. The ADPCM encoder accepts 8-bit PCM compressed signals and expends it to a 14-bit-per-sample. The predicted values are subtracted from encoded signals to produce difference signals. Adaptive quantization is performed on the difference signal to produce a 2-bit, output for transmission over the channel. Computer simulations and experiments were performed to evaluate the performance of the speech vocoder.

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