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Dolby Laboratories SEU4 User Information

Surround encoder
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Summary of Contents for Dolby Laboratories SEU4

  • Page 1 MODEL SEU4 Surround Encoder Users' Information MAIN...
  • Page 2 All requests for repairs or information should include the unit serial number to ensure rapid service. Dolby is a registered trademark of Dolby Laboratories. ©1997 Dolby Laboratories...

  • Page 3: Table Of Contents

    Introduction ..........................1-1 Specifications ..........................1-2 SECTION 2 CONNECTIONS Remote Connector J507 ......................2-1 Power and Fusing ........................2-2 2.2.1 230V-Only SEU4 .......................... 2-2 2.2.2 Multi-Voltage SEU4 ........................2-2 Ground ............................2-3 Audio ............................2-3 Regulatory Notices ........................2-3 SECTION 3 CALIBRATION General ............................

  • Page 4: Section 1 Introduction

    “4-2-4” technique. A four- channel mix is prepared and sent to the input of the SEU4 Surround Encoder via the mixing console. The SEU4 generates a pair of channels that are recorded for subsequent distribution.

  • Page 5: Specifications

    Two balanced floating transformerless outputs. Output gain adjustment will Power Requirements: accommodate a range of 250mV (–9.8dBr) The SEU4 consumes about 20 watts and is to 2.5 V (10.2dBr). designed for operation from a centrally Output impedance 25ohms. switched power source. 230 V version: 198-...

  • Page 6: Section 2 Connections

    6 and 7 of the remote control connector on the rear (J507) engages this loop. Remote Connector J507 The SEU4 has a 15-pin female D-type connector that provides signals for remote metering and control. For optimum immunity to rf interference, use shielded cable and connect the shield to the metal housing of the male D-connector, not to one of the pins.

  • Page 7: Power And Fusing

    Power and Fusing 2.2.1 230V-Only SEU4 METAL CLIP INSTALLED ON UNUSED SIDE OF CARRIER OPEN THE OPEN THE DOOR DOOR INSTALL FUSE ACTIVE FUSE Figure 2.1 Fuse compartment, 230V unit Open the fuse compartment door in the AC mains input connector with a small flat blade screwdriver (see Figure 2.1), and check that the fuse has the correct rating (T250mA 20mm...

  • Page 8: Ground

    Ground It is normal practice to connect signal ground to power line ground for many reasons including safety. In the SEU4 they are linked by a jumper on the input/output board inside the unit. On occasion, hum can be reduced by separating the two grounds. If this is necessary, remove the front panel (2 screws on top and 5 along the bottom) and the top cover (2 screws each side), and move the jumper at the rear left of the unit (J510) to the “holder”...
  • Page 9 Connections for United Kingdom: WARNING: THIS APPARATUS MUST BE EARTHED. As the colours of the cores in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: • The core which is coloured green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol , or coloured green or green and yellow.
  • Page 10 IEC NOTICES IMPORTANT SAFETY NOTICE This unit complies with the safety standard IEC65. To ensure safe operation and to guard against potential shock hazard or risk of fire, the following must be observed: • Ensure the voltage selector is set to the correct mains voltage for your supply. •...

  • Page 11: Section 3 Calibration

    CALIBRATION General The SEU4 is easily calibrated using an external tone, but consideration must be given to the level this tone has in relation to the levels in the remainder of the recording system. An external 1 kHz test tone is used to calibrate the Dolby Models SEU4/SDU4 encode/ decode combination.
  • Page 12 LT and RT outputs. This completes the basic calibration of the SEU4. If the EPL loop is not to be used, remove the link between pins 6 and 7 of J507 to restore normal operation.

  • Page 13: Section 4 Block Diagram

    SECTION 4 BLOCK DIAGRAM MAIN...
  • Page 14 APPENDIX Dolby Surround: Getting Started Studio Questionnaire Technical Requirements for Dolby Surround in Recording Studios "Phase Correctors" and Dolby Surround MAIN...
  • Page 15 Decoder enable mixing in Dolby Surround for consumer release formats such as video, broadcast and CD. The SEU4 has four inputs for Left, Center, Right and Surround channels. It is not always necessary to use the Center input. This signal is also created by central panning across left and right groups.
  • Page 16 CD. A simple no-cost trademark agreement is required and studios should advise their clients to contact Dolby Laboratories directly. For regular users, a blanket agreement, covering all productions, will keep formalities and paperwork to a minimum.
  • Page 17 Studio Questionnaire Dolby Laboratories is active in the marketing of Dolby Surround and in order to maintain our studio database, please complete and return the questionnaire located on the next page. Our database is a valuable reference for production companies and on request, facility addresses and contacts will be forwarded.
  • Page 18 Questionnaire Studio Products Models SEU4 / SDU4 This questionnaire is for recording facilities equipped with the Dolby SEU4 Surround Encoder and Dolby SDU4 Surround Decoder. All technical information will remain confidential. Date _______________ Company ______________________________________________________________________ Contact name ________________________ Title ____________________________________...
  • Page 19 Necessary Equipment Dolby Model SEU4 Surround Encoding Unit. The SEU4 encodes four input signals (Left, Center, Right, Surround) into two output signals (Lt, Rt). Dolby Model SDU4 Surround Decoding Unit. The SDU4 decodes two input signals (Lt, Rt) into four output signals (L, C, R, S) using Dolby Pro Logic Surround decoding technology.
  • Page 20 A note about Dolby’s products: The SEU4 and SDU4 are 1U high, 19" rack mount professional units. Both use XLR type connectors with balanced line levels adjustable from -10 to +8 dBr (0dBr=0.775 Vrms). Pin 2 is “hot.” For unbalanced connections, pin 1 is tied to pin 3 for proper operation.
  • Page 21 The center speaker needs to be at the same height as the left/right pair for best imaging. It is also important to confirm that the polarity (phasing) is correct in all three front speakers so that panned effects create proper phantom images between the center/side speaker pairs. At least two surround speakers will be used, but room shape and area of coverage may dictate that four will be preferred for even coverage.
  • Page 22 Dolby Surround Trademarks The Dolby Surround program is administered by Dolby Laboratories Licensing Corporation under various agreements. Certain conditions apply to the use of Dolby logos for trademark protection purposes. A license to use any Dolby Logo is required of the owner of the work (not the studio in most cases).
  • Page 23 100 Potrero Avenue Wootton Bassett San Francisco, California 94103-4813 Wiltshire SN4 8QJ England Telephone 415-558-0200 Telephone 01793-842100 Facsimile 415-863-1373 Facsimile 01793-842101 Signal Processing and Noise Reduction Systems Dolby and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation MAIN...

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