U4090B Datasheet, PDF (11/34 Pages) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

GT MICO TIN
INLDT
TLDT
STO VL
–
VBG ₊
TXA
U4090B
VL
ZL
Zint
SAO
GSA
SAI
SAI TLDR
94 8059
AFS
control
Max
att.
AGA
–
+ ^VBG
INLDR
RECO1 GR STIS
RECIN
STO
STN
Figure 6. Integration of acoustic feedback suppression circuit into the speech circuit environment
A detailed diagram of the AFS (acountic feedback order to produce the envelopes of the speech at TLDT and
suppression) is given in figure 10. Receive and Transmit RLDT. After amplification a decision is made by the
signals are first processed by logorithmic rectifiers in differential pair, which direction should be transmitted.
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
11 (34)