PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 74

• 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

Table 33
Register
CONFSCU4 15H
SIDEC detects an overcompensation if the level of the supposedly echocancelled output
signal SO is higher than the SI input signal level by an through CONFSCU4.SIADD
configured amount for a sufficiently long period that can be configured through
CONFSCU4.OCIND and CONFSCU4.OCDEC.
In case an overcompensation the effect can be configured with CONFSCU4. OCAMRES
or CONFSCU4.OCHRES.
Low frequency RI superimposing
Former implementations of the LMS algorithm without adaptive step ranging required
superimposing of some low frequency components in the RI signals in order to limit the
canceller degree of freedom in adapting to the end echo path, which resembles a
bandpass filter.
With the introduction of the new adaptive step range algorithm this feature is no longer
needed but still offered for legacy reasons. Please refer to the register description of the
ASTOC register for details. It is recommended to keep this registers at it's default value
00H (feature disabled).
4.4.2
The following tables will give some hint on the configuration of the non linear processor.
Data Sheet
Non linear processing
Overcompensation protection
Addr.
Value
OCINC
OCDEC
SIADD
OCAMR
ES
OCHRE
S
Mod.
Up
Down
Up
Down
Up
Down
0
1
0
1
74
Effect
OC detection sensitivity "Up"
OC detection sensitivity "Down"
OC detection sensitivity "Down"
OC detection sensitivity "Up"
OC detection sensitivity "Down"
OC detection sensitivity "Up"
OC detection effect "Down"
OC detection effect "Up"
OC detection effect "Down"
OC detection effect "Up"
Operational Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954