PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 75

• 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 34
Register
CONFSCU7 18H
CONFSCU8 19H
The final resulting inserted comfort noise level can be configured mainly by modifying the
value CONFSCU7.NOISEINC.
Please keep in mind that ITU comfort noise will generate a constant amplitude signal,
thus the inserted noise level will be generally 3dB higher than the measured level, it is
recommended to set CONFSCU7.NOISEINC to 2H (-3dB) to compensate for this
behavior.
In subjective mode the SO amplitude will simply be limited to the measured background
noise level, in this case the measured level should be increased by 6dB
(CONFSCU7.NOISEINC = 8H), which produced the subjectively best background noise
signal. Please note that in this case the measured background noise level at the SO
output heavily depends on the noise signal form that is inserted at SI.
CONFSCU7.BNINC and CONFSCU7.BNDEC can be modified for fine-tuning of the BN
measurement. Any change has only little effect.
CONFSCU8. BNMAXSL and CONFSCU8. BNMAXRL only limit the range of the SI(SO)
and RI signal levels for which background noise level measurement is enabled. If for
example the level louder signal of SI or SO is higher than CONFSCU8. BNMAXSL the
Data Sheet
Background noise measurement
Addr. Value
NOISEINC Up
BNINC
BNDEC
BNMAXSL Up
BNMAXRL Up
Mod.
Down
Up
Down
Up
Down
Down
Down
75
Effect
comfort noise level "Up"
comfort noise level "Down"
comfort noise level "Up", comfort noise
level stability "Down"
comfort noise level "Down", comfort noise
level stability "Up"
comfort noise level "Down", comfort noise
level stability "Down"
comfort noise level "Up", comfort noise
level stability "Up"
comfort noise level stability "Down", risk of
level too low "Down"
comfort noise level stability "Up", risk of
level too low "Up"
comfort noise level stability "Down", risk of
level too low "Down"
comfort noise level stability "Up", risk of
level too low "Up"
Operational Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954