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Overall Sound Signal Path
Figure 9-1 illustrates the Overall Sound Signal Path.
The AV/SW ICs, IC2L00 and IC2K00, used to se-
lect Main and Sub Picture Video/Color are used to
the select the Sound sources.
IC2L00 selects Main and Sub sound sources from
External NTSC Inputs 1, 3, 4, and 5, and from Com-
ponent Inputs 1 and 2. The selected signals are di-
rected to IC2K00.
IC2K00 selects the signals from IC2L00, or from
the Main Tuner, Sub Tuner, NTSC External Input 2,
DTV Inputs, or the DM Module. The Main Tuner
sound signal is decoded by MCS circuitry in IC3A01
before being applied to IC2K00.
The Sub (PIP) sound signal is routed from IC2K00
to the PIP Sound Output Jacks. The selected main
Sound signal is directed to Audio Control circuitry,
also in IC3A01. The sound signal from IC3A01 is
amplified in IC3E01 and directed to the set's speak-
ers.
The input signals to IC3A01 are also directed to the
Monitor Output Jacks. Only fixed level sound is
available at the Monitor Output Jacks.
AC-3
There is one additional sound output signal in the V19/
V21 chassis, External AC-3
rear of DM Module. This is an AC-3
(when available from a digital source). It allows con-
nection to external components with an AC-3
®
AC-3
Decoder can produce 5.1 channel surround
sound, 5 full audio channels (20 kHz) and one low fre-
quency enhancement channel (120 Hz).
Figure 9-2 shows a Basic Block Diagram of the
Sound circuitry in the DM Module.
9-3
®
Output
®
Decoder Output on the
®
digital data stream
®
Decoder
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