PSB2163T-V31TR Infineon Technologies, PSB2163T-V31TR Datasheet - Page 158

• Manufacturer Part Number: PSB2163T-V31TR
• Description: IC AUDIO RINGING CODEC 28-PDSO
• Manufacturer: Infineon Technologies
• Series: ARCOFI®r

Specifications of PSB2163T-V31TR

• Function: CODEC Filter
• Interface: IOM-2, PCI, Serial
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 900µA
• Power (watts): 1mW
• Operating Temperature: -25°C ~ 80°C
• Mounting Type: Surface Mount
• Package / Case: DSO-28
• Includes: Activation and Deactivation, B-Channel and D-Channel HDLC Controllers, D-Channel Priority Handler, Monitor Channel Handler
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Other names: PSB2163T-V31INTR; PSB2163T-V31TR

Speakerphone Implementation
3.4
How to Determine GAE
In the general description of the speech comparator for the acoustic echo the meaning
of the gain of the acoustic echo, GAE was introduced (see page 149). GAE should
always be adapted to the particular hardware (plastics, microphone, speaker) whereas
in first approximation for all the other parameters standard values can be used. This
chapter shows a simple measurement procedure to find an appropriate value for GAE.
Figure 14
Position of the Speech Comparators SCAE and SCLE
Figure 14 is important as it shows the position of the comparators related to the different
amplification stages. It can be seen that the comparator for the acoustic echo, SCAE,
senses the receive signal directly in front of the analog loudspeaker amplifier ALS and
the transmit signal between the GX and the LGAX stage. As explained in chapter 2.6 the
task of GAE is to adjust the signal level in a way, that in case of direct coupling the
amplitudes at the input of the SCAE are equal.
Semiconductor Group
157