QS7777CF Ver la hoja de datos (PDF) - Nippon Precision Circuits

Número de pieza

componentes Descripción

Fabricante

QS7777CF

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

Nippon Precision Circuits  

QS7777PF/CF

FUNCTIONAL DESCRIPTION

Operating Modes (BYP, MO, AR, AC)

The control pins BYP, MO, AR, and AC select the operating mode bypass/QSurround signal processing of the

FLIN, FRIN, RLIN, RRIN, CIN, and SUBIN input signals and determine the outputs on FLOUT, FROUT,

RLOUT, RROUT, and COUT. The relationship between the inputs and outputs as selected by the control pins

is shown in the following table.

Control pins

Output signals1

BYP MO AR AC

FLOUT

FROUT

RLOUT RROUT COUT

0 0 0 0 Qx(FLIN) +Q1(RLIN) +CIN Qx(FRIN) +Q1(RRIN) +CIN

0 0 0 1 Qx(FLIN) +Q1(RLIN)

Qx(FRIN) +Q1(RRIN)

CIN

0 0 1 0 Qx(FLIN)

+CIN Qx(FRIN)

+CIN q(RLIN) q(RRIN)

0 0 1 1 Qx(FLIN)

Qx(FRIN)

q(RLIN) q(RRIN) CIN

0 1 0 0 Qx(FLIN) +Q1(M(R)) +CIN Qx(FRIN) +Q1(M(R)) +CIN

0 1 0 1 Qx(FLIN) +Q1(M(R))

Qx(FRIN) +Q1(M(R))

CIN

0 1 1 0 Qx(FLIN)

+CIN Qx(FRIN)

+CIN q(M(R)) q(M(R))

0 1 1 1 Qx(FLIN)

Qx(FRIN)

q(M(R)) q(M(R)) CIN

1000

FLIN

+RLIN

+CIN

FRIN

+RRIN

+CIN

1001

FLIN

+RLIN

FRIN

+RRIN

CIN

1010

FLIN

+CIN

FRIN

+CIN

RLIN RRIN

1011

FLIN

FRIN

RLIN RRIN CIN

1 1 0 0 Q1(M(F))

Q1(M(F))

1 1 0 1 Q1(M(F))

Q1(M(F))

q(M(F)) q(M(F))

1 1 1 0 Qx(FLIN)

Qx(FRIN)

q(FLIN) q(FRIN)

1111

FLIN

FRIN

FLIN FRIN

1. Qx( ), Q1( ), and q( ) = QSurround processed signals. For example, Qx(FLIN) indicates a QSurround-processed signal derived from FLIN input.

R = RLIN + RRIN signal, and F = FLIN + FRIN signal.

M( ) = monaural to stereo converted signal. For example, M(R) indicates monaural to stereo conversion of the RLIN+RRIN signal.

The SUBIN signal is normally output on both FLOUT and FROUT.

NIPPON PRECISION CIRCUITS—7

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