Sharp CD-C471 W Service Manual page 13

EXPLANATION OF DOLBY SURROUND PRO LOGIC AND EVALUATION METHOD
Outline
Namely, two speakers are connected in parallel to one
l
amplifier.
In the Pro Logic BYPASS mode the amplifierfor C-ch (center
l
channel) and the amplifier for S-ch (surround channel) are in
MUTE state. The SP output is cut.
State of element output and terminal output in specific mode
l
11 pin R-out Output enabled state
L-ch Output enabled state
R-ch ,Output enabled state
SP OUT C-ch
(SO901 )
SP OUT S-ch
(SO901 )
Test tone output
Pro Logic ON Normal mode
l
Press the remote control TEST TONE button.
Output of only S-ch t Output of only R-ch
The test tone (noise) is repeatedly output for output period
(2 set).
S-ch t R-ch
Pro Logic ON Phantom mode
l
Press the remote control TEST TONE button.
The test tone (noise) is repeatedly output for output period
(2 set).
In this case the following indication appears repeatedly.
Relation between VIDEO IN input and output in Pro Logic
ON state
(1) L-ch/R-ch same phase input into VIDEO IN input jack in
VIDEO Function mode
Almost no output (only omitting component)
Almost no output (only omitting component)
Input signal is output.
(50901) SP out S-ch Almost no output (only omitting component)
Dolby Pro Logic
Bypass mode
No output in MUTE (Q604) state
No output in MUTE (Q603) state
In the normal mode of Pro Logic ON mode the amplifiers for
l
appears.
In the Phantom mode of Pro Logic ON mode the amplifier for
l
C-ch is in MUTE state, so that the SP output is cut. The
amplifier for S-ch (surround) is in operative state, so that the
SP output appears
Dolby Pro Logic On mode
Normal mode
Output enabled state
Output enabled state
Output enabled state
Output enabled state
Output enabled state
Output enabled state
(2) L-ch/R-ch reverse phase input into VIDEO IN input jack in
VIDEO Function mode
(Reverse phase: Phase difference between L and R is 180" )
Output point
L-ch 1 Almost no output (only omitting component)
R-ch
Accordingly, if you want to output signal waveform to C-ch SP
l
out, give the same phase input into L-ch/R-ch INPUT in the
Pro Logic Normal mode.
If one of channels receives input, C-ch does not output. Only
L-ch or R-ch outputs.
If you want to output signal waveform to S-ch SP out, you can
l
use either Normal mode or Phantom mode. However, 180"
reverse phase input must be given to L-ch/R-ch INPUT.
CD-C471 W
Phantom mode
Output enabled state
Output enabled state
No output in MUTE (Q604) state
Output enabled state
SP cut, no output
Almost no output (only omitting component)
Almost no output (only omitting component)
Almost no output (only omitting component)
Input signal is output.
Phantom mode
Almost no output (only omitting component)
Input signal is output.
I