peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 129

• Manufacturer Part Number: peb20954
• Description: Smart Integrated Digital Echo Canceller Sidec
• Manufacturer: Infineon Technologies Corporation

NOTE 2 – An example of a NLP is an analogue center clipper in which all signal levels
below a defined threshold are forced to some minimum value.
non-linear processing loss (A
Additional attenuation of residual echo level by a NLP placed in the send path of an echo
canceller.
pure delay (t
The delay from the R
echo path transmission facilities, not including dispersion time due to the network
elements. In this case, the transit time directly across the hybrid is assumed to be zero
(see Figure 43).
Figure 43
residual echo level (L
The level of the echo signal which remains at the send-out port of an operating echo
canceller after imperfect cancellation of the circuit echo. It is related to the receive-in
signal L
L
Any non-linear processing is not included.
returned echo level (L
The level of the signal at the send-out port of an operating echo canceller which will be
returned to the talker. The attenuation of a NLP is included, if one is normally present.
L
Preliminary Data Sheet
RES
RET
is related to L
= L
h (t)
Rin
RIN
by:
-A
r
ECHO
)
Example of an impulse response of an echo path
t
r
Rin
- A
by:
out
CANC
RES
RET
port to the Sin port due to the delays inherent in the near-end
)
)
NLP
)
t
d
129
T1524870-96
PEB 20954
PEF 20954
Glossary
04.99