- 69 -
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.10.9. Audio Signal Processing & Interface
Audio signal processing is divided uplink path and downlink path.
The uplink path amplifies the audio signal from MIC and converts this analog signal to digital
signal and then transmits it to DBB Chip (MSM6280).
This transmitted signal is reformed to fit in GSM & WCDMA frame format and delivered to RF
Chipset. The downlink path amplifies the signal from DBB chip (MSM6280) and outputs it to
receiver (or speaker).
The receive path can be directed to either one of two earphone amplifiers or the auxiliary output.
The outputs earphone1 (EAR1OP, EAR1ON) and auxiliary out (LINE_OP, LINE_ON) are
differential outputs. Earphone2 (HPH_L, HPH_R) is a single-ended output stage designed to drive
a headset speaker.
The microphone interface consists of two differential microphone inputs, one differential auxiliary
input and a two-stage audio amplifier.
Figure 3.10.9.1 Audio Interface Detailed Diagram(MSM6280)
Содержание KB770
Страница 1: ...Service Manual Model KB770 Internal Use Only Service Manual KB770 Date November 2008 Issue 1 0 ...
Страница 155: ... 156 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 165: ... 166 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 179: ... 180 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...