PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 394

• 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

Data Sheet
Table 20-13 Speakerphone Registers
Register
SCTL
SCTL
SCTL
SCTL
SCTL
SSRC1
SSRC1
SSRC2
SSRC2
SCTL
SCTL
20.1.4
The DSP contains an adaptive line echo cancellation (LEC) unit for the cancellation of
near end echoes. In normal and superior mode line echoes up to 4 ms are considered.
The extended mode works basically like the superior mode, but considers line echoes of
up to 8 ms.
The line echo cancellation unit is especially useful in front of the DTMF detector. A
general block diagram is shown in figure 20-17.
•
Figure 20-17 Line Echo Cancellation Unit - Block Diagram
Input I
signal.
In normal mode the adaption process is controlled by the three parameters MIN, ATT
and MGN. Adaption takes place only if both of the following conditions hold:
2
is usually connected to the line input while input I
I
2
Line Echo Cancellation Unit
# of Bits
1
3
1
1
1
5
5
5
5
1
1
Name
ENS
QU
MD
AGX
AGR
I1
I2
I3
I4
SDX
SDR
Adaptive
+
Filter
-
Comment
Echo suppression unit enable
Select Quality Mode (half-duplex/full-/subband)
Speakerphone or loudhearing mode
AGCX enable
AGCR enable
Input signal 1 (microphone)
Input signal 2 (microphone)
Input signal 3 (line in)
Input signal 4 (line in)
Signal source of SDX
Signal source of SDR
394
1
is connected to the outgoing
Digital Signal Processor
I
S
1
15
PSB 21473
2003-03-31
INCA-D