Manuel d'utilisation / d'entretien du produit SDU4 du fabricant Dolby Laboratories
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î î î î Model SDU4 Surround Decoder User's Manual Issue 2 Part No. 91413 MAIN.
User's Manual Model SDU4 Surr ound Decoder Dolby Laborator ies Incorpor ated U.S. A. 100 Pot r er o A v enue, San F ranc i sco, CA 94103- 4813 Tel : 415- 558- 0200; Fax : 415-863- 1373; W eb: www.
i T ABLE OF CONTENTS SECTION 1–INTRODUCTION ............................................................................................. 1 -1 1.1 The SDU4 .............................................................................................
1-1 SECTION 1 INTRODUCTION 1.1 The SDU4 The Dolby SDU4 is designed for reference monitoring of Dolby encoded film formats or Dolby Surround program material in broadcast, audio-for- video, and music recording applications.
1-2 1.2 Specifications Layout: Rack-mount unit incorporating a professional surround decoder module, interface circuitry, and power supply. Signal Connections: (on rear panel) Lt (Left Total) and Rt (Right Total) XLR inputs for two-channel encoded signal; Left, Center, Right, and Surround XLR outputs.
1-3 1.3 Regulatory Notices UL Troubleshooting must be performed by trained technicians. Do not attempt to service the unit unless you are qualified to do so. WARNING: Check that the units have been set to the correct supply voltage and that the correct fuses have been installed.
1-4 IMPOR T ANT SAFETY NOTICE This unit complies with the safety standard IEC65. T o ensure safe operation and to guar d against potential shock hazard or risk of fir e, the following must be observed: • Ensure the voltage selector is set to the correct mains voltage for your supply .
2-1 SECTION 2 INST ALLA TION AND CALIBRA TION 2.1 Monitor Setup Front Loudspeaker Arrangement The SDU4 is designed for monitoring rooms with either two or three front loudspeakers.
2-2 Surround Loudspeakers The surround loudspeakers are used to distribute a single channel of sound in a diffuse field behind the viewer. The number of loudspeakers needed, therefore, depends upon the size of the area to be covered.
2-3 2.2.2 Multi-Voltage SDU4 OPEN THE DOOR SPARE FUSE (UPPER) FUSE ACTIVE FUSE CARRIER (LOWER) FUSE OCTAGONAL PEG ROUND PEG VOLTAGE SELECTOR WHEEL A2F4037 Figure 2.3 Fuse compartment, multi-voltage unit Open the fuse compartment door in the AC mains input connector with a small flat blade screwdriver (see Figure 2.
2-4 2.3.1 External Facilities Connector (J503) +24V DC GROUND CHASSIS GROUND SURROUND MONITOR RIGHT MONITOR CENTER MONITOR LEFT MONITOR MONO STEREO DOLBY SURROUND LEFT TOTAL MONITOR RIGHT TOTAL MONITO.
2-5 controls are on the right-hand module, Cat. No. 344, as shown in Figure 2.5. Figure 2.5 Cat. No. 344 Center Speaker Switch Switch S301 allows the SDU4 to be installed in monitoring rooms that have either two loudspeakers (labeled “center speaker, no”) or three loudspeakers (“yes”).
2-6 SDU4 OUTPUTS—CENTER LOUDSPEAKER SWITCH SET TO “NO” Mode Left Ri gh t Surround Mono .707 (Lt & Rt) .707 (Lt & Rt) — Stereo L t R t — Dolby Surround L + . 707 ( C) R + .707 (C) S Wake-Up Mode Selection The SDU4 can be set to default to any operating mode when power is first turned on.
2-7 The delay setting can be estimated by using the following method: 1. Estimate the distance between the primary listening location and the nearest surround loudspeaker, in feet. If the metric system is used, convert the distance from meters to feet by multiplying by three (3).
2-8 The SDU4 contains two four element LED calibration indicators for setting of input level. The two input level potentiometers are set so that reference tone from the signal source, representing the studio’s operating level, is equal to the SDU4’s internal operating level.
2-9 R C L S OUTPUT LCRS OFF CSCS NOISE SEQUENCE AUTO MANUAL PINK NOISE Figure 2.9 Pink-noise calibrate functions Output Level Adjustments Output potentiometers are provided so that the decoder output level can be matched to the monitor system. Typically, the SDU4 output level is set using the internal pink noise source.
3-1 SECTION 3 OPERA TION 3.1 Operating Modes and Applications The SDU4 has three modes of normal operation: Mono, Stereo and Dolby Surround. Mono The mono mode combines the Lt and Rt input signals into a single channel and routes it to the Center loudspeaker, if the internal switch S301 is in the "yes" position.
3-2 The matrix format used on Dolby soundtracks is compatible with both monophonic and conventional stereo playback. Many home viewers have purchased Dolby Surround decoding equipment for use during playback of prerecorded videotape or videodisk program material.
3-3 center channel information. This, in effect, will cause the mono-compatible elements of the mix to appear to always come from the center of the picture. On the other hand, the incompatible elements (those that would cancel if the two input channels were summed) would be reproduced around and behind the listener.
4-1 SECTION 4 BLOCK DIAGRAM PIN 1 4 = CHASSIS 3 = LO 2 = HI 1 = CHASSIS NC NC NC REMOTE RT R S LT L C POWER-ON MODE SELECT DOLBY AUTO MANUAL 11 TO REMOTE FADER 1 SELECT FADER CONTROL VOLTAGE GEN MUTE .
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté Dolby Laboratories SDU4 c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du Dolby Laboratories SDU4 - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation Dolby Laboratories SDU4, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le Dolby Laboratories SDU4 va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le Dolby Laboratories SDU4, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du Dolby Laboratories SDU4.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le Dolby Laboratories SDU4. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei Dolby Laboratories SDU4 ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
