U4089B-PFN ATMEL [ATMEL Corporation], U4089B-PFN Datasheet - Page 7
U4089B-PFN
Manufacturer Part Number
U4089B-PFN
Description
Monolithic Integrated Feature Phone Circuit
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.U4089B-PFN.pdf
(26 pages)
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4518A–CORD–05/02
Figure 7. Integration of the Acoustic Feedback-suppression Circuit Into the Speech
Figure 8. Acoustic Feedback Suppression by Alternative Control of Transmit- and
RLDT
RLDR
Circuit Environment
Speaker Amplifier Gain
SAO
GSA
INLDT
INLDR
GT
SAI
SAI
TLDT
TLDR
INLDT
TLDR
VBG
Max
att.
control
AFS
+
-
INLDR
+
-
VBG
RATAFS
TLDT
TXA
AGA
IATGSA
RECO
ATAFS
STO
GR
SAI
IAGAFS
AGA
VL
STI
GSA
STN
Zint
V
B
U4089B-P
IGSA
AGA
RECIN
STO
Z L
V L
7
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