Nokia 5210 Instruction De Maintenance
NSM–5
UI section
PAMS Technical Documentation
Page 7
Issue 1 02/2002
Nokia Corporation
Functional Description
Audio control
The audio control and processing is taken care by the COBBA–GJP,
which contains the audio (and RF codecs, and the MAD2, which contains
the MCU, ASIC and DSP blocks handling and processing the audio sig-
nals.
which contains the audio (and RF codecs, and the MAD2, which contains
the MCU, ASIC and DSP blocks handling and processing the audio sig-
nals.
Pre
& LP
& LP
D
MIC1
LP
A
D
MIC3
MIC2
EARP/N
HF
AuxOut
MCU
Buzzer
DSP
Buzzer
Driver in
Driver in
MAD
Bias +
EMC
EMC
XMICP/N
XEARP/N
HFCM
MICP/N
EMC + Acc.
Interf.
EMC
Preamp
Multipl.
Premult.
Amp
Multipl.
COBBA
A
UISWITCH
The baseband supports three microphone inputs and two earphone out-
puts. The inputs can be taken from an internal microphone, a headset mi-
crophone or PPH–1 microphones. The microphone signals from different
sources are connected to separate inputs at the COBBA–GJP ASIC. In-
puts for the microphone signals are differential type.
puts. The inputs can be taken from an internal microphone, a headset mi-
crophone or PPH–1 microphones. The microphone signals from different
sources are connected to separate inputs at the COBBA–GJP ASIC. In-
puts for the microphone signals are differential type.
The MIC1 inputs are used for a headset microphone that can be con-
nected directly to the HS/HF connector. The internal microphone is con-
nected to MIC2 inputs. In COBBA there are also three audio signal out-
puts 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
for bias supply to the headset microphone. PData(2) is used for PPH–1
mute control.
nected directly to the HS/HF connector. The internal microphone is con-
nected to MIC2 inputs. In COBBA there are also three audio signal out-
puts 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
for bias supply to the headset microphone. PData(2) is used for PPH–1
mute control.
The output for the internal earphone is a dual ended type output capable
of driving a dynamic type speaker. The output for the external accessory
and the headset is dual ended (differential). Input and output signal
source selection and gain control is performed inside the COBBA–GJP
asic according to control messages from the MAD2. Keypad tones,
DTMF, and other audio tones are generated and encoded by the MAD2
and transmitted to the COBBA–GJP for decoding.
of driving a dynamic type speaker. The output for the external accessory
and the headset is dual ended (differential). Input and output signal
source selection and gain control is performed inside the COBBA–GJP
asic according to control messages from the MAD2. Keypad tones,
DTMF, and other audio tones are generated and encoded by the MAD2
and transmitted to the COBBA–GJP for decoding.
External audio connections
The external audio connections are presented on the next page. A head-
set and PPH–1 can be connected directly to the system connector. The
headset microphone bias is supplied from COBBA AUXOUT output and
fed to microphone through XMICP line.
set and PPH–1 can be connected directly to the system connector. The
headset microphone bias is supplied from COBBA AUXOUT output and
fed to microphone through XMICP line.