This paper presents a system implementation for Internet-phone communication with real-time speech coding schemes. A low-cost speech processing coprocessor is embedded. A CPLD device is used to implement the interface between the host processor and the coprocessor via conventional parallel port. At the headphone interface, there are a 16-bits PCM CODEC and an audio amplifier with acoustic echo cancellation features employed. The system consists of a mixed implementation of software and hardware. The experimental coding rate is 8.5 kbps. In such rate, a 14.4 kbps or higher speed modem can conform to offer full-duplex speech for the applications such as digital simultaneous voice data (DSVD).
|Number of pages||11|
|State||Published - 1997|
|Event||Proceedings of the 1997 IEEE Workshop on Signal Processing Systems, SiPS 97: Design and Implementation - Leicester, UK|
Duration: 3 Nov 1997 → 5 Nov 1997
|Conference||Proceedings of the 1997 IEEE Workshop on Signal Processing Systems, SiPS 97: Design and Implementation|
|Period||3/11/97 → 5/11/97|