PSB4860 데이터 시트보기 (PDF) - Siemens AG

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PSB4860

Digital Answering Machine with Full Duplex Speakerphone SAM EC

Siemens AG 

PSB 4860

2.1.3

Echo Suppression

The echo suppression unit can be in one of three states:

• transmit state

• receive state

• idle state

Functional Description

In transmit state the microphone signal drives the line output while the line input is

attenuated. In receive state the loudspeaker signal is driven by the line input while the

microphone signal is attenuated. In idle state both signal paths are active with evenly

distributed attenuation.

idle state

microphone

loudspeaker

line out

line in

transmit state

microphone

loudspeaker

line out

line in

receive state

microphone

loudspeaker

Figure 14 Echo Suppression Unit - States of Operation

line out

line in

Semiconductor Group

30

10.97

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