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

Control

– Programmable via Parallel Host Interface

– Operating parameters and mode settings via a register bank

– Access to audio channels and serial transparent data controller from DSP or an

external Host

– Interface to external software via a full-duplex 256-byte on-chip mailbox

– H.221/H.223 oriented inband configuration/mode switching

General

– Supply voltage: 3.0 - 3.6 V

– Additional 4.5 to 5.5 V supply for connection to 5 V systems without external

components

– Ambient temperature range 0 °C to + 70 °C

– P-TQFP-100 package

1.2

Overview

The PSB 7230 Joint Audio Decoder Encoder for Analog Videophones (JADE AN) is a

device which implements voice compression algorithms using the Algebraic Code

Excited Linear Prediction (ACELP) and the Multi-Pulse Maximum Likelihood

Quantization (MP-MLQ) standard as defined in the ITU-T G.723 Recommendation. In

addition G.711 PCM audio coding is also supported.

Thus, in G.723 mode it compresses the PCM (8 bit A-/µ-law) or 16 bit linear voice signal

into 5.3 Kbit/s (ACELP) or 6.3 Kbit/s (MP-MLQ) bit stream, and vice versa. The

implementation complies with the newest ITU-T C-code V5.1 and includes the G.723

Annex A (Voice Activity Detection and Comfort Noise Generation).

The JADE AN finds applications in

– Analog Videophones (H.324)

– Networks (e.g. LANs) for packetized voice (H.323)

– Video Conference Systems

– Corporate Network voice concentrators, multiplexers and gateways

– Data-over-voice and Voice-over-data terminals.

Other potential application areas are:

– Networks (e.g. LANs) for packetized voice

– Digital Added Main-Line (DAML) & Digital Circuit Multiplication Equipment (DCME)

– Voice storage e.g. in PC based applications

– Message recording and distribution.

The interfaces of the JADE allow a seamless integration into IOM-2 based systems. After

the circuit is set up in the proper mode of operation and parameter settings are

programmed by a controlling software, the circuit runs independently of the rest of the

Semiconductor Group

6

Data Sheet 1998-07-01

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