peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 29

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

3.2.2
Figure 9 depicts the bypass and disabling functions of the SIDEC. They can be
configured via UCC, Serial and P Interface.
Setting NLPDIS =’1’ (pin or register setting) leads to bypassing of the Non Linear
Processor.
Setting BYPASS = ’1’ (Serial control signal, UCC or 2100 Hz tone via register settings)
results in bypassing the Attenuator in the Receive Path as well as in bypassing the
Subtractor, the Non Linear Processor and the Attenuator in the Send Path.
Disabling a channel or the complete canceller will result in a BYPASS function, a H-
Register reset and a reset of the Speech Control Unit. A bypassed or disabled channel
of the SIDEC can still be converted from A/ - Law or vice versa.
If a Modem call is detected the user can define what action is related to the detection of
a Modem call (2100 Hz with phase reversal or without reversal): bypassing, NLP
bypassing, H-Register Reset or combination of the functions.
The 64 Clear mode is activated by bypassing and defining the same Law Conversion at
near end and far end. In 64 Clear mode the signal is still passed through the frame
alignment.
For testing purposes the canceller can be completly bypassed by setting SBYPASS and
RBYPASS.
The Receive out signal can be input directly to the Send In port by setting the RSLOOP
=’1’. The Send out signal can be input directly to the Receive in port by setting the
SRLOOP =’1’. If both loops are configured only RSLOOP will be enabled in the SIDEC.
.
Figure 9
Preliminary Data Sheet
Receive Path
RSLOOP
Bypass and Disabling Functions
’0’
’1’
’0’
’1’
Bypass and Disabling Functions of the SIDEC
RBYPASS
Frame
Alignm.
Frame
Alignm.
64 Clear
log
’1’
’0’
lin
log
lin
tractor
Sub-
BYPASS
’0’
’1’
NLP
’1’
’0’
NLPDIS
29
Attenuator
Attenuator
BYPASS
’1’
’0’
lin
log
lin
64 Clear
’0’
Functional Description
’1’
log
Frame
Alignm.
Frame
Alignm.
SBYPASS
’1’
’0’
PEB 20954
PEF 20954
’1’
SRLOOP
’0’
Receive Path
Send Path
04.99