PSB2163T-V31TR Infineon Technologies, PSB2163T-V31TR Datasheet - Page 151

• 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

Semiconductor Group
It was assumed all the time, that mechanical resonances of the telephone housing can
be neglected. If this assumption does not hold, the adjustment of PDAE and GDAE must
be made in a way, that additionally the signal parts resulting from resonances are
covered by the comparator characteristic. In this case, other measurements or an
empirical approach must be used to find appropriate values. In general, a standard
parameter set is sufficient for most of the applications, but it is always advisable to adapt
GAE to the single telephone housing.
From the signal flow graph in figure 10 it becomes obvious that in fact there are two
programmable parameters each: GDNAE and GDSAE for the delta gain GDAE, PDNAE
and PDSAE for the peak decrement PDAE. Usually it is not necessary to take care of the
presence of two different parameters, and all explanations given in this chapter apply if
the same values are used for GDNAE and GDSAE as well as for PDNAE and PDSAE
the same values are programmed.
Note: To get a comparator characteristic as shown in figure 9, set GDSAE = GDNAE
But of course there are applications where different values make sense, this is always
the case if an additional edge should be introduced in the comparator characteristic
shown in figure 9, for example, if very high mechanical resonances occur with a duration
that is short compared to the acoustic echoes. The letter "S" in GDSAE and PDSAE
stands for "speech" and means that these parameters are only effective, as long as
speech is recognized. Therefore it is possible to cover e.g. high mechanical resonances
with a high GDSAE and a relatively slow PDSAE but then switch to the other pair of
parameters, GDNAE and PDNAE, to get a fast decay ("N" stands for "noise"). Only in
this case with different values the echo time for the acoustic echo ETAE becomes
important. After the ARCOFI-SP has recognized "no speech" the period of time defined
by ETAE passes before the parameters for noise (GDNAE, PDNAE) are used.
Note: To get a comparator characteristic with an additional edge, use GDSAE/PDSAE
For almost every application it is not necessary to work with two sets of parameters, and
standard values can be used instead. But the ARCOFI-SP offers the flexibility to handle
even difficult coupling problems due to its two switchable coefficient sets for the speech
comparators.
and PDSAE = PDNAE. Don’t care for ETAE.
for the time during speech is recognized including the time ETAE afterwards. Use
GDNAE/PDNAE for the rest of the time where there is noise detected.
150
Speakerphone Implementation