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3. TECHNICAL BRIEF
3.10 Microphone
Two microphones are placed in the Front cover and beside receiver. One is for normal voice call &
multimedia functions, and the other is for speakerphone mode voice call. These microphones are
switched by analog switch(U301), which connects audio inputs from the two microphones to main
baseband chip and MMP. The audio signal is passed to MIC_N and MIC_P pins of AD6726. The
voltage supply VMIC is output from AD6726, and is a biased voltage for the MIC_P. The MIC_P and
MIC_N 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). For multimedia functions, these signal processing is done by MMP(AIT716).
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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