User Guide

Nokia Customer Care System Module

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

Audio Hardware

Earpiece

The phone incorporates a 13 mm speaker capsule that is used in DCT3. The speaker is

dynamic, very sensitive, and capable of producing relatively high sound pressure at low

frequencies. The speaker capsule and surrounding mechanics comprise the earpiece.

Microphone

The microphone is an electric microphone with an omnidirectional polar pattern. It

consists of an electrically-polarized membrane and a metal electrode, which form a

capacitor. Air pressure changes (i.e., sound) move the membrane, which causes voltage

changes across the capacitor. Because the capacitance is typically 2 pF, a FET buffer is

needed inside the microphone capsule for the signal generated by the capacitor. The

microphone needs bias voltage as a result of the FET.

MIDI Speaker

The Musical Instrument Digital Interface (MIDI) speaker produces an enriched sound and

defines the data interchange format for ring tones, UI event sounds, and music for games

and entertainment.

An audio amplifier is required because the audio output from the UEM does not produce

enough power for the speaker. The MIDI audio signal, which is generated by the DSP and

the UEM audio CoDec, is routed to the HF output of the UEM (single ended output). An

audio amplifier is used to boost the audio signal so that an acceptable loudness is

achieved.

Rated speed 9700 ±2500 rpm

Rated current 125 mA

Starting current 160 max mA

Armature resistant 8.8 ohm

Rated DC voltage available 1.1 to 2.0 V

Starting DC voltage min. 1.0 V

Table 12: Vibra Parameters (Continued)

Parameter Requirement Unit