Dolby Laboratories SDU4 사용자 설명서 - 페이지 13

{카테고리_이름} Dolby Laboratories SDU4에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Dolby Laboratories SDU4 20 페이지. Surround decoder

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SDU4 OUTPUTS—CENTER LOUDSPEAKER SWITCH SET TO "NO"

Mode

Mono

Stereo

Dolby Surround

Wake-Up Mode Selection

The SDU4 can be set to default to any operating mode when power is first

turned on. This is set using the internal jumpers J1/J2/J3. See Figure 2.5. The

factory setting is Dolby Surround.

External Master Level Control Switch

An external master level control may be added by connecting an external 100K

linear potentiometer between pins 11, 12, and 1 on J503. (All three connections

are required.) The external level control must be engaged by switching the

internal switch S303 to the "remote" position. See Figure 2.6. The factory

setting is "local."

CUSTOMER SUPPLIED REMOTE

FADER POTENTIOMETER

100K LINEAR TAPER

(REAR VIEW)

Figure 2.6 External fader connected to J503

Surround Delay Setting

Figure 2.7 Cat. No. 150 delay adjustment

The Cat. No.150 decoder module has a single adjustment for setting the

surround delay. The delay can be adjusted in 10ms steps. It is helpful to

understand its purpose. The delay to the surround channel is used to reduce

the audibility of crosstalk by offsetting it in time behind the arrival of the main

signal coming from the front loudspeakers. This is particularly important with

dialog information, where crosstalk would be particularly bothersome when

heard coming from the rear. By delaying the surround channel so that common

crosstalk information arrives at the listener about 15-20 ms after the main front

signal, the audibility of the crosstalk signal is substantially reduced.

2-6

Left

.707 (Lt & Rt)

L + .707 (C)

TOP

WIPER

DC GND

F3710A0C

Delay setting

MAIN

Right

Surround

R + .707 (C)

BELDEN 8771

OR EQUIVALENT

TO PIN 11

TO PIN 12

TO PIN 1

CONNECTOR

MOUNTING SCREW

—

J503