peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 24

• Manufacturer Part Number: peb20954
• Description: Smart Integrated Digital Echo Canceller Sidec
• Manufacturer: Infineon Technologies Corporation

Preliminary Data Sheet
3
Figure 7 depicts the Functional Block Diagram of the SIDEC.
3.1
Figure 7
The following paragraphs describe the functions of the SIDEC block diagramm shown in
Figure 7.
3.1.1
The Speech Control analyzes the data from the PCM Input Interfaces and external inputs
and supervises the functions of the other system components. As soon as the far end
subscriber talks, the Adaptive Echo Estimation Unit is activated by the Speech Control.
If the double talk condition is detected or a non speech signal with an adequate echo loss
enhancement is identified by the Speech Control, the content of the Adaptive Echo
Estimation Unit is frozen. Under specific circumstances a reset of the H-Register
with echo path
Receive Out
Near End
Receive Path
Send In
Send Path
Functional Description
Functional Block Diagram and Description
Speech Control
Block Diagram
PCM Output
PCM Input
Interface
Interface
UCCI
Estimation Unit
Adaptive Echo
Reset and
Watchdog
Subtractor
Logic
JTAG
Speech Control
RAM
BIST
Microprocessor
24
Interface
Non Linear
Processor
Control
Clock
Disabling Logic
Serial Interface
Functional Description
PCM Output
PCM Input
Interface
Interface
(connected
to all units)
Test
Receive Path
Send Path
PEB 20954
Send Out
PEF 20954
Receive In
far end subscriber
Remote End with
04.99