U4092B Datasheet, PDF (11/32 Pages) TEMIC Semiconductors – Monolithic Integrated Feature Phone Circuit

TELEFUNKEN Semiconductors
GT MICO TIN
INLDT
TLDT
STO VL
–
VBG ₊
TXA
U4092B
VL
ZL
Zint
SAO
GSA
SAI
SAI TLDR
95 9629
AFS
control
Max
att.
AGA
–
+ ^VBG
INLDR
RECO GR STI
RECIN
STO
STN
Figure 9 Integration of acoustic feedback suppression circuit into the speech circuit environment
A detailed diagram of the AFS (acountic feedback to produce the envelopes of the speech at TLDT and RLDT.
suppression) is given in figure 10. Receive and Transmit After amplification a decision is made by the differential
signals are first processed by logorithmic rectifiers in order pair, which direction should be transmitted.
Rev. A1: 24.01.1995
Preliminary Information
11