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MODEL SEU4
Surround Encoder
Users' Information

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Summary of Contents for SEU4

Page 1: ...MODEL SEU4 Surround Encoder Users Information MAIN ...

Page 2: ...Y INFORMATION USA warranty on the product covered by this manual is subject to the limitations and disclaimers set forth in the warranty disclaimer originally shipped with the product and also printed on the back of the invoice 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 Labor...

Page 3: ...0V Only SEU4 2 2 2 2 2 Multi Voltage SEU4 2 2 2 3 Ground 2 3 2 4 Audio 2 3 2 5 Regulatory Notices 2 3 SECTION 3 CALIBRATION 3 1 General 3 1 3 2 Items Needed 3 1 3 3 Calibration 3 1 SECTION 4 BLOCK DIAGRAM 4 1 APPENDIX Dolby Surround Getting Started Studio Questionnaire Technical Requirements for Dolby Surround in Recording Studios Phase Correctors and Dolby Surround MAIN ...

Page 4: ... adjust the mix content in real time to fit the final playback environment The 4 2 4 technique is essential not only to produce successful surround material but also to guarantee compatibility in conventional stereo and monophonic playback Typically the two channels generated by the SEU4 are distributed by conventional stereo means such as consumer video formats and broadcast systems Listeners who...

Page 5: ...ad less into lower impedances Maximum output 20dBr into unbalanced 600ohm load External Processor Loop A two channel EPL is provided for interface with other equipment The loop is engaged by an internal switch and allows external processing to be inserted via EPL input and output connectors Overall Frequency Response 20Hz 20kHz 1dB L C andR inputs 100Hz 7kHz 3dB surround input S N Ratio referenced...

Page 6: ...ng 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 J507 Pin No Function 1 500mV Surround line in meter point 2 500mV Right line in meter point 3 500mV Center line in meter point 4 500mV Left line in meter point 5 Link to signal ground to disable surround channel 6 Link to signal ground...

Page 7: ...artment Damage will result 2 2 2 Multi Voltage SEU4 OPEN THE DOOR SPARE FUSE UPPER FUSE ACTIVE FUSE CARRIER LOWER FUSE OCTAGONAL PEG ROUND PEG VOLTAGE SELECTOR WHEEL A2F4037 Figure 2 2 Fuse compartment multi voltage unit Open the fuse compartment door in the AC mains input connector with a small flat blade screwdriver seeFigure2 2 andcheckthatthefusehasthecorrectrating Ifnecessary rotate the selec...

Page 8: ...ofessional audio equipment at commonly found studio operating levels Connections to and from the unit are made using standard 3 PinXLR typeconnectors Boththeinputandoutputstagesareelectronicallybalancedwith pin 2 being positive and pin 3 being negative For optimum immunity to radio frequency interference cable shields should be connected to the shells of the XLR connectors not to pin1 For unbalanc...

Page 9: ... plug which is marked with the letter E or by the earth symbol or coloured green or green and yellow The core which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black The core which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red EUROPEAN EMC The 230V unit complies with the EMC requirements of...

Page 10: ...sizionato sul valore corretto Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice L apparecchiatura deve avere un collegamento di messa a terra ben eseguito anche la connessione rete deve avere un collegamento a terra Il cavo di alimentazione a corredo dell apparecchiatura deve essere collegato come segue Filo tensione Marrone Neutro Blu Massa Verde Gi...

Page 11: ...s a complex subject involving a knowledge of the available headroom of the whole system down to the release format You should consult with our staff on your particular application Monitor level The external calibration test tone should be related to the monitoring level Monitor level is usually established and verified using pink noise Procedures for setting monitor level are covered in the Model ...

Page 12: ... on the remote control socket J507 Feed the reference tone into the L and R EPL return connectors together or separately and adjust the EPL return potentiometers to obtain reference level at the 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 Overall encoder operation and c...

Page 13: ...ON XLR CONNECTORS SIGNALS ON TEST POINTS TPXXX ARE IN PHASE WITH INPUTS AND OUTPUTS WHEN PIN 2 OF THE XLR CONNECTORS IS WIRED AS HIGH HOT X SELECTOR VOLTAGE GND 15 7 3 8dB LED RED EPL IN 14 LT STUDIO LEVEL OUTPUTS MAIN AMP OUTPUT 13 500mV TP101 EPL 6 CHASSIS 8 INPUT AC MAINS RT EPL RETURNS METER 4 LED METER 4 LED METER 4 LED 2 3 500mV 4 METER 4 LED 8 TO 8dBu INPUTS LEVEL STUDIO SURROUND LED YEL 1 ...

Page 14: ...A 1 APPENDIX Dolby Surround Getting Started Studio Questionnaire Technical Requirements for Dolby Surround in Recording Studios Phase Correctors and Dolby Surround MAIN ...

Page 15: ...und Although no fixed rules apply some basic mixing techniques have evolved that are universally practiced In features or drama production dialogue and on screen effects are generally centrally positioned to provide an important visual and aural focal point Music and atmospheres are spread around all channels to create an enveloping ambience with spot effects panned to follow movement Similarly in...

Page 16: ...s only present in the Surround channel it may be necessary to modify the mix to ensure reasonable mono compatibility A monitor section on the Model SDU4 Decoder allows easy comparison between formats Software Identification Trademark Usage All Dolby Surround masters should be identified on both packaging and report sheets For commercial distribution use of the Dolby Surround logo or short video lo...

Page 17: ...omplete 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 Equipment and technical details will however remain confidential Please photocopy and send or fax completed Questionnaire to either Dolby office shown MAIN ...

Page 18: ..._______ Model SDU4 Serial No ____________________ Main Equipment List Console _______________________________________________________________________ Monitoring Left Center Right Surround Speakers and Amps ______________________________________________________________________________ Multitrack Machines ___________________________________________________________ Mastering Machines ________________...

Page 19: ...video media This paper outlines the basic equipment necessary for studios to produce soundtracks in Dolby Surround Surround Starts with Stereo Many aspects of producing in Dolby Surround are the same as producing in stereo The main differenceisthatthemixingconsolemustideallyhaveatleastfourbussoutputstofeedaDolby Surround encoder and some additional speakers and amplifiers are needed to monitor the...

Page 20: ...ductions TheSDU4modeandlevelcontrolssimplifyconnectiondirectlytomonitoramplifiers Figure1 shows typical signal flow Programmeters withpeakandaverageweighting arerecommendedtoreadthefourencoder input signals and two encoder output signals SEU4 Encoder Mastering Machine Audio Sources SDU4 Decoder L S R C Amps Speakers S Fig 1 Mixing in Dolby Surround from Multitrack Elements 4 Speakers and amplifier...

Page 21: ...two way bookshelf speakers are sufficient for surround channel use Fig 2 Two Surround Speakers Fig 3 Four Surround Speakers Surround speakers are typically located two or three feet above ear level and should not be aimeddirectlyatthemixingposition Thegoalhereisforanevenlydispersedsoundfield with no prominent hot spots or in the head images While the surround speakers should be in phase with each ...

Page 22: ...he use of equipment may also be available at this time Dolby consultants are also available for staff training All services are on a time plus travel service contract basis and are billed at half day or full day rates 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...

Page 23: ...ing live sporting events a large crowd roar with announcers talking over the ambience could suddenly have more out of phase than in phase information if the announcers were to simply stop talking When these conditions occur the unit will momentarily flip the phase until the situation returns to normal The return flip usually has a small delay before taking place Depending on how you are listening ...

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