LG KM710 Service Manual - Page 32
Audio Signal Processing & Interface, 5.3 Power Resources
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3. HW Circuit Description 3.5.2 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. 3.5.3 Power Resources The power supply module of Triton generates the different power supplies required by Triton, the processors and the external peripherals. Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 33 - LGE Internal Use Only
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