psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 138

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
4.4.4.1
In principle, the SCAE works according to the following equation:
Being in RX-mode, the speech comparator at the acoustic side controls the switching to
TX-mode. Only if the SX-signal is higher than the SR-signal plus the expected/measured
acoustic level enhancement (VAE), the comparator switches immediately to TX-mode.
Physically the level enhancement (VAE) is divided into two parts: GAE and GDAE.
Figure 69
Speech Comparator at the Acoustic Side
Speech Comparator at the Acoustic Side (SCAE)
if
SX > SR + VAE then TX
else RX
128
PSB 21391
PSB 21393
2001-03-07
Codec