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PSB4860

Digital Answering Machine with Full Duplex Speakerphone SAM EC

Siemens AG 

PSB 4860

Functional Description

In figure 9 a phone conversation using the speakerphone is in progress. One party is

using the base station of a DECT system while the other party is using a mobile handset.

At the same time an external call is serviced by the answering machine. In the current

state a message (recorded or outgoing) is being played back. In this case the DTMF

detector is used to detect signals for remote access while the CPT detector is used to

determine the end of the external call.

SSDI/IOM®-2

Channel 1

loud-

speaker

micro-

phone

line

out

line

in

0

00

0

0

acoustic side

Speaker-

phone

line side

0

0

0

Line Echo

Canceller

CPT

decoder

Equalizer

Speech

decoder

Memory

DTMF

Detector

SCI

Figure 9 Functional Units - Simultaneous Internal and External Call

Semiconductor Group

26

10.97

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