User Guide

NPE-4
3 - Audio System PAMS Technical Documentation
Page 3-32 ãNokia Corporation. Original
Figure 18. Carkit audio interface. Block diagram.
CARK-64
This carkit is a passive kit and is just a holder for the phone. No detection is done any-
where.
CARK-112
This is a Bluetooth carkit. The BT Carkit is recognised by the phone after a BT search for
any BT component in the vicinity has been performed and a connection is set up via the
BT module in both phone and accessory.
In case of BT audio the BT accessory and the phone is connected by both an ACL and SCO
air link. ACL is used for connection commands and SCO for the actual audio transmission.
In both cases the BT module (in accessory and phone) receives the audio signal. In the
phone this signal is routed from BT module over LPRF to DSP where it follows the regular
audio path through out the rest of the system. The BT module and MCU is connected by
the CBUS for exchanging low level information.
Voice dialling is only possible in CARK-112 via phone "name" softkey.
HFS-12
HFM-8
26 dB
30 dB
Audio
Interface
System
connector
Control
circuit
MBUS
MCC-1
External
audio sheet
UEM
HFU-2
MBUS
MBUS
MBUS
System
connector
EMI Filter