psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 140
psb21391
Manufacturer Part Number
psb21391
Description
Siemens Codec With Upn Transceiver
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PSB21391.pdf
(253 pages)
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Data Sheet
Figure 70
Interdependence of GDAE and PDAE
According to figure 70, 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.
130
PSB 21391
PSB 21393
2001-03-07
Codec
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