PSB 21373 H V1.1 Infineon Technologies, PSB 21373 H V1.1 Datasheet - Page 133

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PSB 21373 H V1.1

Manufacturer Part Number
PSB 21373 H V1.1
Description
IC SPEECH AND VOICE MQFP-44
Manufacturer
Infineon Technologies
Series
SCOUT™r
Datasheet

Specifications of PSB 21373 H V1.1

Function
CODEC
Interface
IOM-2, SCI
Number Of Circuits
1
Voltage - Supply
5V
Current - Supply
97.5mA
Mounting Type
Surface Mount
Package / Case
44-BQFP
Includes
Activation and Deactivation, Channel Handler, DTMF / Tone / Ringing Generator, HDLC Controller, Speakerphone, Voice Monitoring
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
Operating Temperature
-
Other names
PSB21373HV1.1XT
PSB21373HV11XT
SP000007602
PSB 21373
Figure 68
Block Diagram of the AGC in Transmit Direction
For reasons of physiological acceptance the AGCX gain is automatically reduced in case
of continuous background noise e.g. by ventilators. The reduction is programmed via the
NOlSX-parameter. When the noise level increases the threshold determined by NOISX,
the amplification will be reduced by the same amount the noise level is above the
threshold.
A programmable Loudness Gain Adjustment stage (LGAX) offers the possibility to
amplify the transmit signal after the speech detector SDX. If a lower signal range in front
of the SDX is necessary to determine between speech and echo a part of the transmit
signal amplification can be transferred to the LGAX. It is enabled with the bit GCR.SP.
Note: Even if the AGCX is disabled in speakerphone mode the LGAX remains enabled.
If the speakerphone is in receive mode, the AGCX is not working; instead the last gain
setting is used and regulation starts with this value as soon as the speakerphone returns
into transmit mode again. For transmission measurements with this transient behavior it
is recommended not to use a continuous sine wave signals but some kind of synthetic
speech (e.g. switched noise or Composite Source Signal CSS). The sweep range of the
switchable attenuation ATT (see chapter 4.4.1) is affected by the AGCX.
If the automatic gain control enlarges the signal level, the sweep range will be increased
accordingly in order to obtain a constant over-all gain in transmit and receive direction
(constant TCL, constant echo return loss).
Data Sheet
133
2002-05-13

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