An I-phone system design and implementation with a portable speech coding coprocessor

Ruei Xi Chen, Liang Gee Chen, Mei Juan Chen, Tsung Han Tsai

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This paper presents a high quality, low bit rate, and portable Internet-phone system. The system consists of a mixed implementation of software and hardware. The hardware includes a portable box that can be plugged into the conventional parallel port. Three major parts are considered in this box: the speech compression unit, the host interface, and the speakerphone module. A low-cost non-delicate speech coprocessor is embedded to process the heavy job of speech coding, a CPLD device is employed to control the host access timing, a 16-bits PCM CODEC and an audio amplifier with acoustic echo cancellation features are introduced to optimize the speakerphone module. The experimental coding rate is S.Skbps. In such rate, the popular modems can conform to offer full-duplex speech in real time. Modern applications of this system are dropped on the digital simultaneous voice data (DSVD). Such as Net-game's talking and Video-conferencing.

Original languageEnglish
Pages (from-to)1262-1269
Number of pages8
JournalIEEE Transactions on Consumer Electronics
Issue number4
StatePublished - 1997


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