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PEB20954E

Smart Integrated Digital Echo Canceller

Infineon Technologies 

PEB 20954

PEF 20954

Introduction

PSTN

VoIP Gateway

SIDEC

PEB 20954

IP Network

(ATM,Frame Relay

,Ethernet)

VoIP Gateway

Figure 3 SIDEC in a Voice over IP Gateway

An emerging market in the telecom industry is “Voice Over IP”. Due to the long delay

echo cancellation is required. The delay is introduced through packetizing and voice

compression. The SIDEC handles different functions in a Voice over IP gateway, such

as Voice Detection, Voice Activity Detection, Comfort Noise and A-law u-law conversion

regarding G.711.

In a gateway the SIDEC points into the PSTN network as shown in Figure 3. The echo

itself is generated by the hybrid in the PSTN cloud. Before the voice signal from the

POTS gets packetized into ATM, FR or Ethernet cells the echo is being cancelled by the

SIDEC.

For a high voice quality in “Voice Over IP” environment echo cancellation is a major

requirement.

Data Sheet

17

Rev. 2, 2004-07-28

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