QS7779CM 查看數據表（PDF） - Nippon Precision Circuits

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QS7779CM

3D Stereo Enhancement and 3D Virtual Stereo Surround with Dolby Pro Logic and Mixed DVD (AC-3) Decoder

Nippon Precision Circuits  

QS7779PM/CM

FUNCTIONAL DESCRIPTION

Operating Mode

This chip can be set to a desired operating mode by

control pins for the parallel interface (P/S pin sets to

HIGH) or control bits for the serial interface (P/S pin

sets to LOW). The control pins or bits configurations

are shown in the following table.

Mode

No.

1

Control Pins/Bits

PSAV

BYP SPRD MUTE

E

1

×

0

0

2

0

0

0

0

3

0

1

0

0

4

×

×

1

0

5

×

×

1

1

Note1. × : Don’t care.

Note2. MUTE = 1 when PSAVE = 1

Operation

(Output signal)

LOUT

ROUT

Description

LIN

RIN Bypass mode

QX(LIN)

QX(RIN)

Stereo enhanced and virtual surround mode with lower enhanced

level

QX+(LIN)

QX+(RIN)

Stereo enhanced and virtual surround mode with higher enhanced

level

–

–

Mute mode

–

–

Pow er save mode. This function is available with serial interface only

Mode description

Mode No.

Operating description

1

Bypass mode. Outputs the stereo signal as it is input.

Stereo Enhanced and virtual surround mode with low er enhanced level.The Dolby Surround Pro Logic signal (Lt, Rt) input. Available

2

Surround Effect with two speakers by Qsurround technology. Virtual location of each signal is;

The Front signal: Virtually outside of the speakers.

The Rear signal: Virtually behind the listeners.

3

Stereo Enhanced and virtual surround mode with higher enhanced level.The Dolby Surround Pro Logic signal (Lt, Rt) input. Available

Surround Effect with two speakers by Qsurround technology. This mode outputs the signals much more spread sound than Mode 2.

4

Mute mode. No signal at output pins.

5

Pow er save mode. This function is available with serial interface only.

Center signal output

CIN and COUT are used to emphasize the center signal.

Pin

CIN

COUT

Outputs the doubled signal to ROUT and LOUT always.

Outputs the half level of signal ((RIN+LIN)/2).

Description

How to use CIN and COUT.

s Connect CIN and COUT with a resistor to make

the center signal emphasized.

s Input resistance for CIN is 5kΩ. For example, con-

necting a 5kΩ resistor between CIN and COUT

makes output of (RIN+LIN)/2 to ROUT and

LOUT.

s Directly connecting CIN and COUT makes ROUT

and LOUT output (RIN+LIN).

NIPPON PRECISION CIRCUITS—8

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