Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 1998.07g
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- Pages.2414-2416
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- 1998
Real-Time Implementation of Speech Vocoder For Video Telephony
화상 전화용 음성 보코더의 실시간 구현
- 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)
- Published : 1998.07.20
Abstract
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.
Keywords