QS7777PF データシートの表示（PDF） - Nippon Precision Circuits

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QS7777PF

QSurround™ 3D Virtual Audio Processor for Dolby AC-3 and ProLogic

Nippon Precision Circuits  

QS7777PF/CF

Controls (SPREAD, AREA)

The SPREAD input and AREA flag are used to con-

trol the FLOUT and FROUT signals in QSurround

mode. In QSurround mode, the total sound heard is

an enhanced version (virtual sound source) of the

actual sound sources (speaker). When SPREAD is

HIGH, the virtual sound source is widened, strength-

ening the surround enhancement effect. The AREA

flag is used to widen the surround sound effect

sweet-spot. This can be used for a larger listening

audience. Note that AREA is set by serial input data

only, and is therefore not available in parallel inter-

face mode. The SPREAD and AREA control func-

tions are shown in the following figure.

Enhanced FLIN

Sound Source

with SPREAD = L

Front Left

Speaker

Front Right

Speaker

Enhanced FRIN

Sound Source

with SPREAD = L

Enhanced FLIN

Sound Source

with SPREAD = H

Wider Listening Area

(AREA = H)

Narrower Listening Area

(AREA = L)

Enhanced FRIN

Sound Source

with SPREAD = H

Virtualized RLIN

Sound Source

with SPREAD = L

Virtualized RRIN

Sound Source

with SPREAD = L

Virtualized RLIN

Sound Source

with SPREAD = H

Virtualized RRIN

Sound Source

with SPREAD = H

NIPPON PRECISION CIRCUITS—8

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