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PSB4860

ICs for Communications Sophisticated Answering Machine with Echo Cancellation SAM-EC

Infineon Technologies 

PSB 4860

1.6

System Integration

The combined with an analog front end (PSB 4851) can be used in a variety of

applications. This combination offers outstanding features like full duplex speakerphone

and emergency operation. Some applications are given in the following sections.

1.6.1

Analog Featurephone with Digital Answering Machine

Figure 4 shows an example of an analog telephone system. The telephone can operate

during power failure by line powering. In this case only the handset and ringer circuit are

active. All other parts of the chipset are shut down leaving enough power for the external

microcontroller to perform basic tasks like keyboard monitoring.

For answering machine operation the voice data can be stored in a Flash memory

devices. In addition, voice prompts can be stored in the Flash as well. Alternatively, An

ARAM or DRAM can be used to store the voice data. Then, the voice prompts can be

stored EPROM which can be connected to the /PSB 4851 additionally. The

microcontroller can use the memory attached to the /PSB 4851 to store and retrieve

binary data.

PSB 4851

Flash Memory

tip/

ring

line

077-3445

SCI

Microcontroller

Figure 4 Analog Full Duplex Speakerphone with Digital Answering Machine

Data Sheet

20

2000-01-14

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