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參數(shù)資料
| 型號(hào)： | PSB7280 |
| 廠商： | SIEMENS A G |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Joint Audio Decoder-Encoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 文件頁(yè)數(shù)： | 5/190頁(yè) |
| 文件大小： | 2177K |
| 代理商： | PSB7280 |
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PSB 7280
Semiconductor Group
5
Data Sheet 1998-07-01
1
Introduction
1.1
Overview
The PSB 7280 Joint Audio Decoder Encoder is a device which implements voice
compression algorithms using the Low-Delay Code Excited Linear Prediction (LD-CELP)
standard as defined in the ITU-T G.728 Recommendation, and for 7-kHz voice using the
Sub-Band Coded Adaptive Differential PCM (SBC-ADPCM) coding according to the
G.722 Recommendation. In addition G.711 PCM audio coding is also supported.
Thus in the G.728 mode it compresses a digitized PCM (64 kbit/s) or linear (128 kbit/s)
voice signal into a 16 kbit/s bit stream, and vice versa. The algorithm is implemented in
16-bit fixed point arithmetic and complies with the newest fixed point specification set
forth by the ITU.
In the G.722 mode it compresses the PCM compressed (128 kbit/s) or the linear
uncompressed (256 kbit/s) 7 kHz audio samples into a rate of 48/56/64 kbit/s, and vice
versa.
The JADE finds applications in
– ISDN Videophones (H.320)
– 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
system. Status and control information to/from the JADE can be transferred either
inband the compressed audio data via the corresponding selected interface or outband
using an 8-bit parallel host interface.
In a Videophone system using the 8
×
8 (formerly IIT) VCP (Video Codec and Multimedia
Communications Processor) the Siemens PSB 7280 can work standalone without the
need of external initialization. The default configuration of the JADE is such, that no host
is needed in this case and the full communication is done between the VCP and the
Siemens PSB 7280.
The voice compression algorithms are implemented by an embedded 16-bit fixed point
Digital Signal Processor with all memories internal and no external memory needed.
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