QS7785 NPC [Nippon Precision Circuits Inc], QS7785 Datasheet - Page 10

• Manufacturer Part Number: QS7785
• Description: 3D 2/4-Channel Stereo Surround Synthesizer
• Manufacturer: NPC [Nippon Precision Circuits Inc]

Speaker Arrangement
The QS7785PF/CF supports the following speaker arrangements.
Type A. Two front speakers in front and two surround
Type C. Front speakers and surround speakers in
Type A
The front speakers are placed in front and the sur-
round speakers are placed behind the audience to
create a full rich enhanced space. Since the output
signal for each channel has undergone Qsurround
processing, the audio enhancement can be reduced to
an adequate level even for television and similar sig-
nals where the left and right channels are located
close to each other.
Type B
The front speakers and surround speakers are both
placed in front of the audience, perhaps because it is
not possible to place speakers behind the audience. If
the surround speakers are turned to face outwards, to
spread the surround signal, the surround effect can
be obtained.
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38
speakers in rear
front with actual center speaker
RIN
LIN
37
38
RIN
LIN
SROUT
FROUT
FLOUT
SLOUT
COUT
CIN
SROUT
FROUT
FLOUT
SLOUT
COUT
CIN
24
26
21
22
25
23
24
26
21
22
25
23
Speakers
Front
Speakers
Rear
QS7785PF/CF
Type B. Front speakers and surround speakers in
Type D. Front speakers and surround speakers in
Type C
A center speaker can be added in the center to repro-
duce vocal and speech signals for easy listening. The
center signal is output on COUT. The signal is com-
prised of LIN and RIN signals, producing a sound
image in the center.
Type D
If a center speaker is not available or not required,
COUT can be connected to CIN using a resistor and
the center signal is then added to the front-channel
signal. The presence of the center signal added to the
front channels reproduces the center signal sound
image with virtually the same effect as that obtained
using a center speaker. The connection using a resis-
tor can be utilized for voice and similar fixed-band
signals. See “Center Control” for a description of the
method.
front
front with center
37
38
37
38
RIN
LIN
RIN
LIN
SROUT
FROUT
SROUT
FROUT
FLOUT
FLOUT
SLOUT
SLOUT
COUT
COUT
NIPPON PRECISION CIRCUITS—10
CIN
CIN
24
26
21
22
25
23
24
26
21
22
25
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