Internal Microphone And Earpiece - Nokia NSW-6 Series Technical Documentation Manual

System module se2

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Technical documentation manual (20 pages)

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Technical documentation manual (20 pages)

Table Of Contents

Table of Contents

NSW-6

System Module SE2

Slide

EMI

Bias +

EMI

MIC2

MIC1

MIC3

EMI+ACC

Interf.

XMICP

XMICN

XEARP

XEARN

AuxOut

EAR

Display

EMI

The baseband supports three microphone inputs and two earphone

outputs. The inputs can be taken from an internal microphone, a headset

microphone or from an external microphone signal source. The

microphone signals from different sources are connected to separate

inputs at the COBBA_D asic. Inputs for the microphone signals are

differential type.

The MIC1 inputs are used for a headset microphone that can be

connected directly to the headset connector. The internal microphone is

connected to MIC2 inputs and an external pre–amplified microphone

(handset/handfree) signal is connected to the MIC3 inputs. In COBBA

there are also three audio signal outputs of which dual ended EAR lines

are used for internal earpiece and HF line for accessory audio output. The

third audio output AUXOUT is used only for bias supply to the headset

microphone. As a difference to DCT3 generation both external MIC & EAR

are fully differential (4–wire IF). No common mode line (SGND) is used.

The output for the internal earphone is a dual ended type output capable

of driving a dynamic type speaker. Input and output signal source

selection and gain control is performed inside the COBBA_D asic

according to control messages from the MAD1. Keypad tones, DTMF, and

other audio tones are generated and encoded by the MAD1 and

transmitted to the COBBA_D for decoding.