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PSB7280

Joint Audio Decoder-Encoder

Infineon Technologies 

PSB 7280

standards, so that compatibility between equipment from different manufacturers is

ensured.

A low-cost H.320 videophone solution for ISDN line as a PCI card for commercial PC’s

is shown in Figure 5.

PAL/NTSC

Camera

ARCOFI-SP

SIEMENS

IOM-2

PSB 2163

MPEG 1

SRAM

Stereo DAC

Video

SRAM/DRAM

Codec

Video in

Video out

JADE

SIEMENS

PSB 7280

Video

Capture

PCI

Bus Interface

Host

ISAC-S TE

SIEMENS

PSB 2186

SIEMENS

SAB 83C515A

ISDN

Figure 5

The JADE and the video codec chip (e.g. the Video Communication Processor “VCP”

from 8 × 8 Inc.) constitute the heart of the videophone.

Both (together with the microcontroller 83C515) are connected to the PC via the PCI bus

using PCI bus interface (e.g. the “VPIC” of 8 × 8 Inc.).

The JADE compresses/decompresses audio according to the ITU-T standards G.728,

G.722 and G.711 and runs a fully inband controlled protocol on the interface to the video

codec. It receives/transmits uncompressed audio via the IOM-2 interface from/to the

ARCOFI-SP. The setup for this application is done automatically after a hardware reset,

so no additional initialization by a host is required. Since the JADE has all its memories

on chip, no external SRAM needs to be connected.

The ARCOFI-SP (Audio Ringing Codec Filter) is a hands-free codec for 3.1-kHz voice

which performs detection and elaborate balancing of the received and transmitted audio

to suppress undesirable effects due to acoustical feedback of the signal from the remote

subscriber. The quality obtained is very close to that of echo-free full duplex

conferencing.

Semiconductor Group

19

Data Sheet 1998-07-01

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