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2.3.1 Keypad/LCD and Receptacle Part
Once the main keypad is pressed, the key signals are sent out to MSM6800A for processing. Touch keypad is pressed,
I2C and Ack signals of U517(touch IC) are sent out to MSM6800A for processing. In addition, when the key is
pressed, the keypad/LCD lights up through the use of 11 LEDs. The terminal status and operation are displayed on
the screen for the user with the characters and icons on the LCD.
Moreover, it exchanges audio signals and data with external sources through the receptacle, and then receives power
from the battery or external batteries.
2.3.2 Audio Processing Part
MIC signals are amplified through OP AMP, inputed into the audio codec and converted into digital signals.
Oppositely, digital audio signals are converted into analog signals after going through the audio codec. These signals
are amplified at the audio amplifier and transmitted to the ear-piece. The signals from MSM6800A activate the ringer
by using signals generated in the timer in MSM6800A.
2.3.3 MSM Part
MSM6800A is the core element of CDMA system terminal that includes ARM926EJ-S microprocessor core. It
supports both CDMA and Digital FM, operating in both the cellular and PCS spectrums. The subsystems within the
MSM6800A include a CDMA processor, a DFM processor, a multi-standard Vocoder, an integrated CODEC with
earpiece and microphone amplifiers, general-purpose ADC for subsystem monitoring, an ARM926EJ-S
microprocessor, and an RS-232 serial interfaces supporting forward and reverse link MDR data communications of
230.4 Kbps simultaneously. And it also contains complete digital modulation and demodulation systems for both
CDMA and AMPS cellular standards, as specified in IS-95-A/B/C.
In MSM, coded symbols are interleaved in order to cope with multi-path fading. Each data channel is scrambled by
the long code PN sequence of the user in order to ensure the confidentiality of calls. Moreover, binary quadrature
codes are used based on Walsh functions in order to discern each channel. Data created thus are 4-phase modulated
by one pair of Pilot PN code and they are used to create I and Q data.
When received, I and Q data are demodulated into symbols by the demodulator, and then de-interleaved in reverse to
the case of transmission. Then, the errors of data received from Viterbi decoder are detected and corrected. They are
voice-decoded at the Vocoder in order to output digital voice data.
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Summary of Contents for VX9700
Page 26: ... 25 132 LG Electronics Inc VX9700 28 Powering Down Restart Z 3 X B O X C O M ...
Page 59: ... 58 132 LG Electronics Inc VX9700 Waveform Waveform F106 pin2 DP2 pin2 Z 3 X B O X C O M ...
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Page 167: ... 15 132 LG Electronics Inc VX9700 Appendix 3 Part List VX9700 Part List Z 3 X B O X C O M ...
Page 168: ... 16 132 LG Electronics Inc VX9700 Appendix 4 Components Layout Z 3 X B O X C O M ...
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