PSB7230 데이터 시트보기 (PDF) - Siemens AG

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PSB7230

Joint Audio Decoder-Encoder for Analog Videophone JADE AN

Siemens AG 

PSB 7230

Introduction

1.6.1 H.324 Desktop Videoconferencing Solution for POTS

An H.324 desktop videoconferencing solution for POTS (plain old telephone system) line

as a PCI card for commercial PC’s is shown in Figure 4.

PAL/NTSC

Camera

ARCOFI-SP

SIEMENS

IOM-2

PSB 2163

MPEG 1

Stereo DAC

optional

SRAM

Video

SRAM/DRAM

Codec

Video in

Video out

JADE AN

SIEMENS

PSB 7230

Video

Capture

PCI

Bus Interface

Host

ALIS

SIEMENS

PSB 4595/

PSB 4596

ISAR 34

SIEMENS

PSB 7115

tip/ring

PCI Bus

V.34+ Modem *)

(synchronous access)

........

tip/ring

*) either an on-board modem or an external modem may be used

Figure 4

The connection to the POTS line can be done either by an on-board modem or an

external V.34+ modem that is capable of synchronous data transfer. In the case of the

modem on board, the videophone can be regarded as an add-on modem feature.

The JADE AN 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 modem) are connected to the PC via a PCI Bus Interface (e.g.

the “VPIC” of 8 × 8 Inc.).

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

G.723 (5.3 and 6.3 Kbit/s) and G.711 (used in e.g. LAN applications) 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 JADE AN is

setup for this application automatically after a hardware reset, so no additional

initialization by a host is required. Since the JADE AN has all its memories on chip, no

external SRAM needs to be connected.

Semiconductor Group

17

Data Sheet 1998-07-01

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