PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 390

• 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
The time ET [ms] after speech ends, the parameters of the comparator are switched to
the “noise” values. If both sets of the parameters are equal, ET has no effect.
Table 20-8
Parameter # of bytes Range
G
GDS
PDS
GDN
PDN
ET
20.1.3.3 Attenuation Control
The attenuation control unit performs state switching by controlling the attenuation
stages GHX and GHR. In receive state, the attenuation G is completely switched to
GHX. In transmit state, the attenuation G is completely switched to GHR. In idle state,
both GHX and GHR attenuate by G/2. State switching depends on the signals of one
speech comparator and the corresponding speech detector.
The attenuation G is programmable. The attenuation G actually provided by the
attenuation stages GHR and GHX is the attenuation determined by the parameter ATT
minus the attenuation reported by the echo cancellation unit (G = ATT - G
Additional (fixed) attenuation on the transmit and receive path is also influenced by the
automatic gain control stages AGCX and AGCR, respectively.
While each state is associated with the programmed attenuation, the time T
reach the steady-state attenuation after a state switch can be programmed. The time
T
formula
If the current state is either transmit or receive and no speech on either side has been
detected for time T
attenuation is incremented (decremented) by DS until the evenly distribution G/2 for both
GHX and GHR is reached.
Table 20-9 summarizes the parameters for the attenuation unit.
SW
depends on a programmable decay rate SW and the current attenuation G by the
T sw
1
1
1
1
1
1
=
Speech Comparator Parameters
SW G
TW
then the idle state is entered. To smoothen the transition, the
– 48 to + 48 dB
0 to 48 dB
0.025 to 6 dB/ms
0 to 48 dB
0.025 to 6 dB/ms
0 to 992 ms
.
390
Comment
Base Gain
Gain Reserve (Speech)
Peak Decrement (Speech)
Gain Reserve (Noise)
Peak Decrement (Noise)
Time to Switch from speech to noise
parameters
Digital Signal Processor
C
PSB 21473
SW
).
2003-03-31
it takes to
INCA-D