Panasonic TH-37PX60U, Technical Manual

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Audio Process Block Diagram
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IC3101 of the A board handles the audio selection of most inputs. Analog Audio signals from composite,
component, and DVI inputs are connected to IC3101 for selection. The analog audio of the tuner is also
provided to IC3101 for selection. The output of IC3101 enters IC2106 and undergoes analog to digital
conversion. The serial data output is provided to the switch. 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.
Digital television reception of the tuner is output in the form of an IF (Intermediate Frequency) signal
IC8302 contains a detector circuit that retrieves the transport stream from the IF signal. The transport stream
then enters The DTV I/F (Interface) section of IC8001 where the audio signal is extracted and converted to
serial data. The output is provided to the switch located inside IC2106. The output of the switch enters the
Audio Process section of the IC. 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 for amplification.
The PWM output signals of the power amplifier are output to the right and left channel speakers for sound
reproduction.
The Monitor output connection of IC3101 provides left and right channel audio output for connection to an
external audio amplifier. HDMI PCM (Pulse Code Modulation) Audio and DTV AC3 audio are connected to
the optical audio output jack via a switch located inside IC2106.
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