PEB20954E Ver la hoja de datos (PDF) - Infineon Technologies

Número de pieza

componentes Descripción

Lista de partido

PEB20954E

Smart Integrated Digital Echo Canceller

Infineon Technologies 

POTS

MSC

POTS

Echo

POTS

E1/T1 SIDEC

POTS

PEB 20954

PEF 20954

Introduction

round trip time: 180 ms

BTS

TRAU

TRAU

BTS

BSC

BTS

BTS

TRAU: Transcoder Rate Adaptor Unit

MSC: Mobile Switching Center

BSC: Base Station Controller

BTS: Base Transceiver Station

SIDEC in a WL System

Figure 5 SIDEC in a Wireless System

Due to voice compression and error correction the one way transmission time for

wireless voice signals is typically 90 ms. With 180 ms roundtrip time the 50 ms roundtrip

time for echo free transmission is exceeded by at least 130 ms. Hence, the speaker on

the mobile phone will hear any kind of echo generated in the hybrid next to the POTS or

the acoustical echo of the POTS. The SIDEC suppresses those two kinds of echoes if it

is incorporated in the MSC. Depending on the individual call the end echo path can differ

dramatically. In Europe the end echo path could even go to different countries causing

strong dispersion of the echo. Only a high quality echo canceller with long end path delay

options guarantees compensation of the strongly varying echoes.

Data Sheet

19

Rev. 2, 2004-07-28

Share Link: