User Guide

NPE-4
3 - Audio System PAMS Technical Documentation
Page 3-4 ãNokia Corporation. Original
Introduction
This Chapter specifies the Audio hardware for the NPE-4 program.
Abbreviations
UEM Universal Energy Management
UPP Universal Phone Processor
UIF codec User InterFace Codec in UPP
VBAT Main battery voltage
PWM Pulse Width Modulated (signal)
MUX MUltiPlexer
GND Phone ground
LGND GND abbreviation in System connector
SGND Signal ground – reference for microphone
MCU MicroController Unit
PWB Printed Wire Board
ERP Ear Reference Point
MRP Mouth Reference Point
SPL Sound Pressure Level (reference value 20 uPa)
BT BlueTooth
AGC Adaptive Gain Control
DRC Dynamic Range Compressor
ALWE Noise suppressor algorithm
AEC Acoustic Echo Canseler
IMD Insert Moulded Decoration
SCO Syncronous Connection Oriented
LPRF Low Power Radio Frequency (BlueTooth)
PWM Pulse Width Modulated