Only For Training And Service Purposes - LG GT500 Service Manual

B. Voice Call Uplink Mode (Receiver,Speaker,Headset)
This section provides a detailed description of the Voice Call TX functions.
From the audio path view point, voice call has the same structure as video telephony. The TXMIX connection
enables insertion of audio into the uplink audio path. This can, for example, be used to play dictation
recordings for the listener at the other party, in a voice call or video telephony call. The connection to TXMIX
from the Audio Mixer must be performed in 8 kHz mono, since this is supported by the Voice mode. Due to
performance reasons it may not be possible to decode every audio format during video telephony.
Each Voice Uplink Mode paths shown below.
Receiver Mode : C-MIC(SPM0410LR5H)
Loud Speaker Mode : C-MIC(SPM0410LR5H)
Video Telephony Mode : C-MIC(SPM0410LR5H)
Headset Mode : Headset MIC
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3-3-5. Voice call Uplink Scheme
AB3100 Input(MIC1N/1P)
AB3100 Input(SPK1N/1P)
AB3100 Input(MIC1N/1P)
Analog Switch(FSA201)
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3. TECHNICAL DESCRIPTION
AB3100 Input(AUXI1N/1P)
LGE Internal Use Only