Vehicle Handsfree Solution Hf7300; Introduction; Handsfree Features - Ericsson EF738 Service Manual

Accessories

Vehicle HandsFree Solution HF7300

Introduction

The Vehicle Handsfree Solution HF7300 is specially designed for the Ericsson 7X8-
family telephones and includes apart from the handsfree facilities also a power sup-
ply for battery charging and phone operation.
The four main components are:
• Cradle
• Stick-On Microphone
• External Speaker
• Handsfree Unit

HandsFree Features

The HandsFree Unit does not include a DSP (digital signal processor) as the CPU
(Central Processing Unit) of the telephone handles the handsfree switching.
The handsfree function is semi-duplex, which only permits one party to talk at a
time while the other party is switched off to avoid feedback. When the land side
party is talking, a "comfort noise" is added to simulate the background noise heard
from the mobile.
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