PSB 21373 H V1.1 Infineon Technologies, PSB 21373 H V1.1 Datasheet - Page 129

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

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 66
Interdependence of GDAE and PDAE
According to figure 66, a compromise between the reserve GDAE and the decrement
PDAE has to be made: a smaller reserve (GDAE) above the level enhancement GAE
requires a longer time to decrease (PDAE). It is easy to overshout the other side but the
intercommunication is harder because after the end of the speech, the level of the
estimated echo has to be exceeded. On the contrary, with a higher reserve (GDAE*) it
is harder to overshout continuous speech or tones, but it enables a faster
intercommunication because of a stronger decrement (PDAE*).
Two pairs of coefficients, GDSAE/PDSAE when speech is detected, and GDNAE/
PDNAE in case of noise, offer a different echo handling for speech and non-speech.
With speech, even if very strong resonances are present, the performance will not be
worsened by the high GDSAE needed. Only when speech is detected, a high reserve
prevents clipping. A time period ETAE [ms] after speech end, the parameters of the
comparator are switched to the “noise” values. If both sets of the parameters are equal,
ETAE has no function.
Data Sheet
129
2002-05-13