PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 381

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

Table 20-5
Register
SCTL
SCTL
SAEWFL
SAEDTR
SAEEL
SAEDTL
SAEDTI
SAEDTD
As shown in table 20-5, with the control bits QU different modes of the acoustic echo
cancellation unit can be selected. In subband mode, four different modes are provided.
With increasing number of QU, the considered echo length increases and so does the
computational effort.
20.1.2
The INCA-D offers a noise reduction block built in the echo cancellation unit. This noise
reduction suppresses noise before the signal is output to the line side. This makes
conversation more pleasant for the person at the line side.
In fullband mode, the noise reduction can only be enabled if the new fullband mode is
used. The noise reduction is performed after the echo cancellation and can thus be
considered as an additional block after the signal summation point in figure 20-5. Note
that the noise reduction adds about 1 ms delay to the signal. If the bit SCTL:ERD is set,
then the delay for echo cancellation and noise reduction is still below 2 ms.
In subband mode, the noise suppression is performed for each subband. Figure 20-8
shows how the noise reduction block (called NR) matches in the echo cancellation unit.
The noise reduction adds no delay to the signal.
Data Sheet
Noise Reduction
# of Bits
3
1
15
15
15
15
15
15
Subband Mode Registers
Name
QU
EWF
WFATT
AECATT
AECLIM
AECDTM
AECDTI
AECDTD
Comment
Determine AEC modes
Wiener filter enable (subband only)
Wiener filter attenuation limit
AEC attenuation reduction during double-talk
Upper limit of the attenuation of the AEC
Minimum energy to detect double talk
How fast the attenuation gets incremented.
How fast the attenuation gets decremented.
381
Digital Signal Processor
PSB 21473
2003-03-31
INCA-D