PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 379

• 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 20-4 shows the registers associated with the echo cancellation unit in fullband
mode.
Table 20-4
Register
SCTL
SCTL
SAELEN
SAEAW
SAEDTR
SAEEL
SAEDTL
SAEDTI
SAEDTD
The length of the FIR filter for the echo compensation can be varied from 63 up to
• 639 taps (~80 ms) if fullband mode one is used
• 768 taps (~96 ms) if fullband mode two is used
The length of the adaptation window can be varied from 64 to 256 taps (8 ms to 32 ms).
20.1.1.3 Echo Cancellation (Subband Mode)
A simplified block diagram of the subband echo cancellation unit is shown in figure 20-
7. The signal coming from the microphone and the signal from the line side are analyzed
into several subbands. Then for each subband, the block diagram of figure 20-7 is
identical to the block diagram of the fullband mode. After the echo cancellation of each
subband, the subbands are synthesized. Finally and additionally to the fullband mode,
in the subband mode an optional Wiener filter is provided.
Data Sheet
# of Bits
Echo Cancellation Unit Registers
10 FBLEN
15 AECATT
15 AECLIM
15 AECDTM
15 AECDTI
15 AECDTD
3 QU
1 ERD
9 FBADA
Name
Comment
Determine AEC modes (see table 20-5)
Enable reduced delay for new fullband mode.
Length of FIR filter.
Length of adaption window.
AEC attenuation reduction during double-talk.
Maximum attenuation reported by the AEC unit.
Minimum energy to detect double talk.
How fast the attenuation reduction gets
incremented.
How fast the attenuation reduction gets
decremented.
379
Digital Signal Processor
PSB 21473
2003-03-31
INCA-D