QS7779PM/CM

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

3D Stereo Enhancement and 3D Virtual Stereo Surround

with Dolby Pro Logic and Mixed DVD (AC-3) Decoder

OVERVIEW

The QS7779PM/CM is an audio processor IC which

implements a decoder for stereo matrix encoded

source materials such as the Dolby Surround Pro

Logic and mixed DVD (AC

−3) with surround virtu-

alization using QSound

™ technology developed and

licensed by QSound Labs, Inc. This chip produces

enhanced stereo sound for a stereo input signal and if

the input signal contains matrix encoded surround

sound, the chip decodes it and produces 3D virtual-

ized surround sounds with two speakers.

FEATURES

s

Capable of decoding Dolby Surround materials

such as Dolby Pro Logic or other matrix surround

encoded materials (DVD/AC

−3)

s

Virtualized surround sound with two speakers

s

3D stereo sound enhancement

s

Two enhanced levels

s

Parallel and serial digital interface for mode con-

trol

face (Data, Clock)

• QS7779PM for three-wire serial interface

(Data, Clock and Strobe)

s

Supply voltage (analog): 5 to 13V

Supply voltage (digital): 4.5 to 5.5V

s

24-pin SSOP packaging

APPLICATIONS

s

DVD, Laser disk player

s

Audio systems including TV, Radio and VCR

s

Computer-based multimedia products, including

sound cards and powered loudspeakers

QS7779PM

QS7779CM

Using these products does not require any Dolby certifications.

ORDERING INFORMATION

Dolby and the double-D symbol are registered trademar ks of Dolby Laboratories Licensing Corporation.

1

13

24

12

QXAC3

QXAC2

QXAC1

RIN

LIN

COUT

CIN

QXAC4

VCC

QXBC1

QXBC2

QXBC3

QXBC4

ROUT

VREFIN

LOUT

VREFOUT

VREF

GND

SPRD(SCL)

MUTE(STRB)

VDD

P/S

BYP(SDA)

1

13

24

12

QXAC3

QXAC2

QXAC1

RIN

LIN

COUT

CIN

QXAC4

VCC

QXBC1

QXBC2

QXBC3

QXBC4

ROUT

VREFIN

LOUT

VREFOUT

VREF

GND

SPRD(SCL)

MUTE

VDD

P/S

BYP(SDA)

D e vice

P a ck ag e

QS7779PM

24-pin SSOP

QS7779CM

24-pin SSOP