LG KE590 Service Manual page 32

3.4.2 Audio Signal Processing & Interface
The Audio module consists of a Voice Codec dedicated to mobile telephone terminal application and
a Stereo path.
- The Voice Codec circuit processes analog audio components in the uplink path and transmits the
converted data to the DSP speech coder through the voice serial port (VSP). In the downlink path,
the Voice Codec converts the digital samples of speech data received from the DSP via the VSP
port into analog audio signals. The Voice Codec supports a 8kHz (default narrowband mode) to a
16kHz(wideband mode) sampling frequency.
- The Stereo path converts audio digital samples received from the I2S serial interface into analog
audio. It supports all standard frequencies from 8kHz to 48kHz (8, 11.025, 12, 22.05, 24, 32, 44.1
and 48kHz).
- Two included PLLs provide the suitable system clocks to the Voice and Stereo circuitry (ADC,
DACS, Digital Filters, Digital interfaces). The Audio module supports 3 possible input master clocks:
12MHz, 13MHz and 19.2MHz.
3.4.3 Power Resources
The power supply module of Triton generates the different power supplies required by Triton, the
processors and the external peripherals.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Circuit Description
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LGE Internal Use Only