Audio Process Block Diagram
Audio Process Block Diagram
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IC3101 of the A board handles the audio selection of most inputs. Analog audio of the tuner and audio signals
from composite, component, and DVI inputs are connected to IC3101 for selection. The output of IC3101 enters IC2106 and
undergoes analog to digital conversion. The serial data output is provided to the audio DSP (Digital Signal Processor).
Volume, bass, treble, and balance adjustments of the audio signal are performed by this circuit. The output is two channel
PWM data that are applied to IC2301 and IC2302 for amplification. The PWM output signals of the power amplifiers are
output to the right and left channel speakers for sound reproduction. The HDMI receiver section of IC4510 converts the
incoming HDMI audio into serial data. The Audio interface circuit selects between the two HDMI audio and outputs the SD
(serial Data) to the switch located inside IC2106. Two outputs are provided, one for the digital audio output jack, the other for
the speakers. Digital television reception of the tuner is output in the form of a transport stream that contains MPEG2 video
and AC3 audio. The transport stream enters the DTV I/F section of IC8001 where the audio signal is extracted and converted
to serial data. Two outputs are provided to IC2106. One output consists of the AC3 audio that will be provided to the digital
audio output jack. The other output consists of left and right audio that will be used to drive the speakers. Speaker output of
the DTV and HDMI audio is selected and converted to analog. The analog audio is then output to an audio amplifier (IC2011)
and then applied to the audio selector (IC3101). The optical jack audio signal is also selected and processed inside IC2106.
Q2303 is a muting transistor that applies a low to IC2106 when a headphone jack is connected to the unit. Q2302 applies a
low to IC2106 when the mute function of the unit is active.
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