U4089B-P_05 Datasheet, PDF (7/26 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit

U4089B-P
Figure 4-2. Integration of the Acoustic Feedback-suppression Circuit Into the Speech
Circuit Environment
VB
VL
GT
INLDT
TLDT
STO
VL
ZL
-
VBG ₊
Zint
SAO
GSA
SAI
SAI TLDR
AFS
control
Max
att.
AGA
-
+ ^VBG
INLDR
RECO GR
RECIN
STI
STN
ST O
Figure 4-3. Acoustic Feedback Suppression by Alternative Control of Transmit and
Speaker Amplifier Gain
TLDT
TXA
SAI
RLDT _INLDT
RLDR
INLDR
TLDR
IATGSA
AGA
IAGAFS
AGA
IGSA
ATAFS
RATAFS
GSA
7
4518C–CORD–10/05