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PSB4860

Digital Answering Machine with Full Duplex Speakerphone SAM EC

Siemens AG 

PSB 4860

Functional Description

Figure15 shows the signal flow graph of the echo suppression unit in more detail.

microphone

SDX

AGCX

GHX

LGAX

line out

SCAS

Attenuation

Control

SCLS

loudspeaker

LGAR

GHR

SDR

AGCR

line in

Figure 15 Echo Suppression Unit - Signal Flow Graph

State switching is controlled by the speech comparators (SCAS, SCLS) and the speech

detectors (SDX, SDR). The amplifiers (AGCX, AGCR, LGAX, LGAR) are used to

achieve proper signal levels for each state. All blocks are programmable. Thus the

telephone set can be optimized and adjusted to the particular geometrical and acoustical

environment. The following sections discuss each block of the echo suppression unit in

detail.

Semiconductor Group

31

10.97

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