PSB2163T-V31TR Infineon Technologies, PSB2163T-V31TR Datasheet - Page 53

• 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

separately programmable: PDS for speech and PDN for space (background noise)
signals.
The Peak Detector is very sensitive to spikes. The LP1 filters the incoming signal
containing noise in a way that main spikes are eliminated. Due to the programmable time
constant it is possible to refuse high-energy sibilants and noise edges.
To compress the speech signals in their amplitudes and to ease the detection of speech,
the signals have to be companded logarithmically. Hereby, the speech detector should
not be influenced by the system noise which is always present but should discriminate
between speech and background noise. The limitation of the logarithmic amplifier can
be programmed via the parameter LIM, where the upper half-byte features LIMX and the
lower half-byte LIMR. LIM is related to the maximum PCM level. A signal exceeding the
limitation defined by LIM is getting amplified logarithmically, while very smooth system
noise below is neglected. It should be the level of the minimum system noise which is
always existing; in the transmit path the noise generated by the telephone circuitry itself
and in receive direction the level of the first bit which is stable without any speech signal
at the receive path.
Description of the programmable speech detector parameters:
Parameter
LP1
OFF
PDS
PDN
LP2S
LP2N
LP2L
LIMX, LIMR
2.2.5.2 Speech Comparators (SC)
Switching from one active mode to another one is mainly controlled by the speech
comparators. There are two Speech Comparators, one at the acoustic (AE) and one at
the line side (LE). This offers a different programming of the sensitivity of the speech
detectors and avoids clipping due to echoes. These comparators continuously compare
the signal levels of both signal paths and control the effect of the echos at the acoustic
side and the line side. Once speech activity has been detected, the comparator switches
at once in that direction in which the speech signal is stronger. For this purpose each
signal is compared to the sum of the other and the returned echo.
Semiconductor Group
# of CRAM
Bytes
1
1
1
1
1
1
1
1
Range
1 to 512 ms
0 to 50 dB
1 to 512 ms
1 to 512 ms
4 to 2000 s
1 to 512 ms
0 to 95 dB
– 36 to – 78 dB
52
Comment
Time constant LP1
Level offset up to detected noise
Time constant PD (signal)
Time constant PD (noise)
Time constant LP2 (signal)
Time constant LP2 (noise)
Limitation of LP2, related to LIM
Limitation of logarithmic amplifier
Functional Description