PSB4860 Datasheet, PDF (25/250 Pages) Siemens Semiconductor Group – Digital Answering Machine with Full Duplex Speakerphone SAM EC

PSB 4860
Functional Description
The following figures show the connections for two typical states during operation. Units
that are not needed are not shown. Inputs that are not needed are connected to S₀ which
provides silence (denoted by 0). In figure 8 a hands-free phone conversation is currently
in progress. The speech coder is used to record the signals of both parties. The alert tone
detector is used to detect an alerting tone of an off-hook caller id request while the CID
decoder decodes the actual data transmitted in this case.
loud-
speaker
micro-
phone
line
out
line
in
0
0
0
acoustic side
Speaker-
phone
line side
0
0
0
Line Echo
Canceller
CID
decoder
Speech
coder
AGC
Alert Tone
Detector
Figure 8 Functional Units - Recording a Phone Conversation
Memory
SCI
Semiconductor Group
25
10.97