QS7785CF datasheet(10/15 Pages) NPC

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QS7785PF/CF

NIPPON PRECISION CIRCUITS—10

Speaker Arrangement

The QS7785PF/CF supports the following speaker arrangements.

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.

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.

Type A. Two front speakers in front and two surround

speakers in rear

Type C. Front speakers and surround speakers in

front with actual center speaker

Front

Speakers

Rear

Speakers

SROUT

FROUT

CIN

COUT

FLOUT

SLOUT

RIN

LIN

SROUT

FROUT

CIN

COUT

FLOUT

SLOUT

RIN

LIN

Type B. Front speakers and surround speakers in

front

Type D. Front speakers and surround speakers in

front with center

SROUT

FROUT

CIN

COUT

FLOUT

SLOUT

RIN

LIN

SROUT

FROUT

CIN

COUT

FLOUT

SLOUT

RIN

LIN

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