Sony KV-32XBR400, Training Manual

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Audio Block Diagram
Features
The XBR400 audio section features:
XBR400 Series Audio Section Features (Menu selection)
Feature Description Circuit location
Steady
Sound Reduces dynamic range to
prevent drastic volume changes
when switching channels or when
a commercial comes on. Audio Processor
IC7001
TruSurround
Sound Simulates a 3D sound using the
stereo signal and only the TV
speakers IC4101, IC4103
Simulated
Surround Adds echo to a Mono signal to
simulate a larger room. Audio Processor
IC7001
Separate
Woofer and
Tweeter Tweeter is located at the bezel for
better HF dispersion.
15Watts/
channel
RMS IC packages. Power comes from
fusible resistors on the D board. IC7002 & IC7005
Fixed or
Variable
audio
Output Output is present only when the
speaker is switched OFF from the
menu. The fixed or variable level
can be chosen IC7001
Signal Path
B Board
IC3201 (CXA2069) is an analog switch that selects both audio and video.
Using I2C data from the Main uCom IC701 (not shown), IC3201 can se-
lect between the following:
•
Main Tuner
•
Sub Tuner
•
Video 1 - 4
The output of IC3201 is sent to IC3202. IC3202 is an analog switch that
only handles audio. The input choices are:
•
Main signal
•
Sub signal
•
Video 5
•
Video 6
Selection of Main Vs Sub sound is used in the Twin mode. The outputs
go to the rear monitor output jack and the S board for TruSurround Sound
processing.
S Board
The L/R channel audio is applied to both TruSurround IC4101 and Switch
IC4102. The TruSurround IC4101 outputs the L/R audio if the TruSurround
mode is not selected.
When TruSurround is selected, the second output from TruSurround
IC4101 to D/A IC4103 is used. IC4103 converts the digital data to a
control signal that instructs switch IC4102 to return L/R audio to a differ-
ent part of IC4101 for TruSurround sound processing. The output of IC4101
is into the Audio Processor IC7001 on the A board.
A Board
IC7001 handles the simulated and steady sound processing. It also ad-
justs the volume, treble, bass, and balance based upon the user com-
mands. Its output is split into three paths. The speaker path is to a high
and a low pass filter, then to the 15W power amplifiers IC7002 and IC7005.
The third path is through buffer IC7007 to the TV’s rear panel audio out-
put jack. This path is muted (not shown) when the TV speaker is ON. If
the user turns the speaker OFF from the menu, it is implied the user has
an external amplifier or audio processor connected to the rear audio jack
so this jack is unmuted (enabled). The user must then select a variable or
fixed output level.