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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. 9 Microphone
The microphone is placed to the Front cover and contacted to main PCB. The audio signal is passed
to VINNORP and VINNORN pins of AD6726. The voltage supply VMIC is output from AD6726, and is
a biased voltage for the VINNORP. The VINNORP and VINNORN signals are then A/D converted by
the voice band ADC part of AD6726.The digitized speech (PCM 8KHz ,16KHz) is then passed to the
DSP section of AD6726 for processing (coding, interleaving etc).
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