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

doi:10.1109/30.642395

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

Department of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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 language	English
Pages (from-to)	1262-1269
Number of pages	8
Journal	IEEE Transactions on Consumer Electronics
Volume	43
Issue number	4
DOIs	https://doi.org/10.1109/30.642395
State	Published - 1997

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

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