Q67101-H6773 Просмотр технического описания (PDF) - Infineon Technologies

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Q67101-H6773

Joint Audio Decoder-Encoder - Multimode

Infineon Technologies 

PSB 7238

Introduction

In order to make the best possible use of the total bandwidth and obtain the best possible

video quality, the audio should require only a small fraction of the total data rate. This is

made possible by using parametric compression techniques such as LD-CELP

(16 Kbit/s), ACELP (5.3 Kbit/s) or MP-MLQ (6.3 Kbit/s). Above all, the corresponding

norms (G.728 and G.723) are internationally adopted standards, so that compatibility

between equipment from different manufacturers is ensured.

A low-cost H.320/324 videophone solution for both ISDN and POTS 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 MM

SIEMENS

PSB 7238

Video

Capture

PCI

Bus Interface

Host

ISAC-S TE

SIEMENS

PSB 2186

SIEMENS

SAB 83C515A

ISDN

PCI Bus

V.34 Modem

(synchronous access)

........

POTS

Figure 5

This “multimode” board is capable to work with whatever telephone line is available,

digital ISDN or analog POTS.

The JADE MM 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 MM compresses/decompresses audio according to the ITU-T standards

G.728, G.723, 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 MM has all its memories on chip, no external SRAM needs to be connected.

Semiconductor Group

19

Data Sheet 1998-07-01

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