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Titolo:
AN I-PHONE SYSTEM-DESIGN AND IMPLEMENTATION WITH A PORTABLE SPEECH CODING COPROCESSOR
Autore:
CHEN RX; CHEN LG; CHEN MJ; TSAI TH;
Indirizzi:
NATL TAIWAN UNIV,DEPT ELECT ENGN TAIPEI 10764 TAIWAN
Titolo Testata:
IEEE transactions on consumer electronics
fascicolo: 4, volume: 43, anno: 1997,
pagine: 1262 - 1269
SICI:
0098-3063(1997)43:4<1262:AISAIW>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PREDICTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
R.X. Chen et al., "AN I-PHONE SYSTEM-DESIGN AND IMPLEMENTATION WITH A PORTABLE SPEECH CODING COPROCESSOR", IEEE transactions on consumer electronics, 43(4), 1997, pp. 1262-1269

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 rateis 8.5kbps. 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 22:00:56