PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 69

• Manufacturer Part Number: PEF 20954 HT V1.1
• Description: IC ECHO CANCELLER DGTL TQFP144
• Manufacturer: Infineon Technologies

Specifications of PEF 20954 HT V1.1

• Function: Smart Integrated Digital Echo Canceller (SIDEC)
• Interface: PCM, Serial, UCC
• Number Of Circuits: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 350mA
• Power (watts): 900mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 144-LFQFP
• Includes: Double Talk Detection
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: PEF20954HTV1.1; SP000007505

In ITU comfort noise mode SIDEC inserts a white noise with a constant amplitude and
sign generated by a PN-generator.
In the SIDEC unique subjective mode, SIDEC simply limits the outgoing SO signal to an
amplitude defined by the adaptive background noise level.
4.3.5.3
The NLP activation (background noise insertion instead of echo compensated near end
signal) of the SIDEC is controlled through sophisticated functions by several conditions
that are tightly coupled with the adaptive filtering function and double talk conditions. The
user can control these functions through a multitude of configuration settings.
4.3.6
SIDEC features a configurable multi-step double talk detection that is needed by several
other functions of the device.
4.3.7
SIDEC can detect far and near end signal activity for controlling of the echo cancelling
functionality.
4.3.8
For optimization of the adaptive filter algorithm SIDEC removes DC components from
the SO signal. This offset-compensation function is also applied to the SI-signal to
ensure AC only level measurement.
4.3.9
SIDEC can be configured to several operational states on the detection of the following
"disable" tone signals:
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All of the detectors for the above signal forms can be configured to the special needs of
the implemented telecommunications system.
4.3.10
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Data Sheet
2100 Hz (G.164)
2100 Hz with phase reversal (G.165)
2000 Hz (SS7 continuity check tone)
Idle pattern detection (ITU confirming and flexibly configurable)
TS16 evaluation (in E1 system)
External serial signal (FLEXCTRL)
Direct register control through the P-Interface.
NLP control
Double talk detection
Voice activity detection
Offset compensation
Disable tone detection functions
Other disable event detection functions
69
Operational Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954