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Dolby Surround

Dolby Surround
Mixing Manual

Mixing Manual

Part

Part No.

No. 91536

91536

Issue

Issue 2

Summary of Contents for SDU4

Page 1: ...Dolby Surround Dolby Surround Mixing Manual Mixing Manual Part Part No No 91536 91536 Issue Issue 2 2...

Page 2: ...5542 6160 Facsimile Facsimile 81 3 5542 6158 81 3 5542 6158 Dolby Laboratories International Services Shanghai Co Ltd Dolby Laboratories International Services Shanghai Co Ltd 03 07a 18 F The Center 0...

Page 3: ...13 2 13 2 3 9 2 3 9 SPL SPL Meters Meters 2 14 2 14 2 3 10 2 3 10 Phase Phase Scope Scope 2 14 2 14 Chapter Chapter 3 3 System System Installation Installation 3 1 3 1 3 1 3 1 Signal Signal Routing Ro...

Page 4: ...Panning Panning Sounds Sounds 5 2 5 2 5 5 5 5 Stacking Stacking Encoded Encoded Tracks Tracks 5 2 5 2 5 6 5 6 Magic Magic Surround Surround 5 2 5 2 5 7 5 7 Decoder Decoder Mistracking Mistracking and...

Page 5: ...n Audio Consol io Console e 7 5 7 5 7 10 7 10 Game Game Playback Playback 7 6 7 6 Chapter Chapter 8 Theory 8 Theory of Operation of Operation 8 1 8 1 8 1 8 1 Encoder Encoder 8 1 8 1 8 2 8 2 Decoder De...

Page 6: ...ektronix 760 760 Phase Phase Scope Scope Display Display of of Center Center Channel Channel Information Information 2 15 2 15 2 22 2 22 Tektronix Tektronix 760 760 Phase Phase Scope Typic Scope Typic...

Page 7: ...7 3 7 3 Dolby Dolby Surround Surround Game Game Encoding Encoding 7 3 7 3 7 4 7 4 Game Game Mixer Mixer 7 4 7 4 7 5 7 5 Waveform Waveform of of Game Game Encoded Encoded Signal Signal 7 4 7 4 7 6 7 6...

Page 8: ...of Tables List of Tables Table Table Description Description Page Page 3 1 3 1 EPL EPL Connecti Connections ons 3 12 3 12 3 2 3 2 Delay Delay Switch Switch Settings Settings 3 14 3 14 7 1 7 1 Dolby Do...

Page 9: ...e the same as those of stereo stereo soundtrack production The main difference is that the mixing console must have at soundtrack production The main difference is that the mixing console must have at...

Page 10: ...t signals Left Center Right and Surround from the audio console Surround from the audio console and matrix encodes them into two and matrix encodes them into two output signals Lt and Rt The Lt output...

Page 11: ...onform to a The various room possibilities for working with Dolby Surround encoding all conform to a basic basic standard They all require the typical standard They all require the typical Left and Ri...

Page 12: ...front of the room working in the front of the room and the clients listening in the and the clients listening in the back Sharing two Surround back Sharing two Surround speakers within this configura...

Page 13: ...n master control rooms and screening rooms are similar to control rooms For larger rooms several Surround speakers may be are similar to control rooms For larger rooms several Surround speakers may be...

Page 14: ...ield monitors In either case the design of all three front speakers must be three front speakers must be identical panning from one type of speaker to another identical panning from one type of speake...

Page 15: ...equally If amps for each should be rated equally If the Center speaker is smaller and the the Center speaker is smaller and the Center channel bass is being redirected to the Center channel bass is b...

Page 16: ...ure 2 8 This configuration provides a good phantom This configuration provides a good phantom image image Figure 2 8 Listener in Sweet Spot Figure 2 8 Listener in Sweet Spot If the listener moves to e...

Page 17: ...rmation This results is a narrower mix narrower than most people are than most people are accustomed to This further supports the need to have a accustomed to This further supports the need to have a...

Page 18: ...iver is oriented for the correct dispersion characteristics if you place it in dispersion characteristics if you place it in any position other than its normal one any position other than its normal o...

Page 19: ...arate from any other front channel subwoofer is normally connected to this channel with an subwoofer is normally connected to this channel with an appropriate amplifier Since the appropriate amplifier...

Page 20: ...s The exact needs for a complex mixes The exact needs for a particular application will depend on the complexity particular application will depend on the complexity of the of the mix When deciding to...

Page 21: ...tor outputs If this is done check three outputs If this is done check three things First set the control room monitor level pot things First set the control room monitor level pot in a fixed in a fixe...

Page 22: ...practices for proper SPL is based on film practices The SPMTE standards call for setting The SPMTE standards call for setting each channel so each channel so that pink noise at reference level reprod...

Page 23: ...e meter is used to properly calibrate speaker levels The A sound pressure meter is used to properly calibrate speaker levels The most readily available most readily available units in the US are from...

Page 24: ...s the top and the Surround channel will appear across the top and the Surround channel will appear at the sides Information that is in appear at the sides Information that is in all channels will appe...

Page 25: ...me direction Past Other countries are moving in the same direction Past wiring practices and equipment designs wiring practices and equipment designs in the USA Europe and elsewhere have led in the US...

Page 26: ...ect one of the inner wires to the hot or go If the equipment at the other end is unbalanced connect one of the inner wires to the hot or go side the other to the cold side the other to the cold or ret...

Page 27: ...end Aux Send L L L L L L R R R R R R C C C C S S S S L L L L R R R R t t t t t t t t Figure 3 2 Signal Routing Stereo Bus and Auxiliary Sends Figure 3 2 Signal Routing Stereo Bus and Auxiliary Sends T...

Page 28: ...and one stereo output can be used for left right panning and a second used for center surround a second used for center surround panning Although not as flexible as a film style panning Although not...

Page 29: ...l volume control and monitor loop insert points for inserting the SDU4 In this points for inserting the SDU4 In this case installation is very simple and the case installation is very simple and the m...

Page 30: ...odules assigned to feed the encoder can easily be feed the encoder can easily be reassigned to the stereo bus of the console and reassigned to the stereo bus of the console and audio can be re audio c...

Page 31: ...and withdrawing the plug in modules On the more recent more recent units silver finish remove the front extrusion first However it is likely units silver finish remove the front extrusion first Howeve...

Page 32: ...t t S S S S OUTPUTS OUTPUTS INPUTS INPUTS CAT CAT No No 338 338 Figure 3 11 SEU4 with EPL Figure 3 11 SEU4 with EPL Highlighted Highlighted Troubleshooting Tip Troubleshooting Tip If you are feeding s...

Page 33: ...Right speakers and a channel stereo from the Left and Right speakers and a Mono summation of the audio in the Mono summation of the audio in the Center speaker when in the Mono mode Center speaker wh...

Page 34: ...the unit to wa you want the unit to wakeup in the stereo or mono keup in the stereo or mono mode remove the card and move the jumper mode remove the card and move the jumper to the appropriate positio...

Page 35: ...switch in the remote position and no pot attached and no pot attached 3 5 5 3 5 5 EPL EPL Switch Switch As with the encoder the decoder As with the encoder the decoder contains an EPL switch as shown...

Page 36: ...s will In most studio applications all three front speakers will be identical In some applications be identical In some applications however a smaller version of the Left and Right however a smaller v...

Page 37: ...speakers and subtract the distance from the seating position to the nearest Surround speaker nearest Surround speaker Add 10 to the result This Add 10 to the result This is the proper time delay in is...

Page 38: ...e 3 2 Delay Switch Settings Table 3 2 Delay Switch Settings Setting Setting Delay Delay 0 0 20 20 ms ms 1 1 30 30 ms ms 2 2 40 40 ms ms 3 3 50 50 ms ms 4 4 60 60 ms ms 5 5 70 70 ms ms 6 6 80 80 ms ms...

Page 39: ...reen LED is approximately 1 4 dB to right green LED is approximately 1 4 dB In some In some cases it may be difficult to keep both green LEDs lit If so adjust until you are at the cases it may be diff...

Page 40: ...output of the SEU4 final output of the SEU4 encoder These trims are encoder These trims are usually set for unity gain at the usually set for unity gain at the factory Should you desire to change them...

Page 41: ...the Center speaker and Center speaker ignore the setting for the Center speaker and adjust only adjust only Left Right and Surround The level for Center Left Right and Surround The level for Center s...

Page 42: ...ned as less than 5300 cubic feet or 150 cubic meters ANSI SMPTE 222M calls For small rooms defined as less than 5300 cubic feet or 150 cubic meters ANSI SMPTE 222M calls for a modification of the X cu...

Page 43: ...om there No matter what convention you choose equalize the No matter what convention you choose equalize the Left Center and Right speakers to Left Center and Right speakers to match match the curve I...

Page 44: ...ds further back in the room room Sometimes only a mono element is Sometimes only a mono element is available when a surround effect is desired In this case available when a surround effect is desired...

Page 45: ...oves bring up the signal on more than one fader and fade each to one fader and fade each to a a different output which allows you to use the different output which allows you to use the faders as pann...

Page 46: ...or example crickets in the at once For example crickets in the Surround channel and chickens in the front cause Surround channel and chickens in the front cause the sounds the sounds to bleed into the...

Page 47: ...rround channel remove the stereo output from output from the device and pan it a little towards the center instead of hard left and right Experiment to get the device and pan it a little towards the c...

Page 48: ...also be present in a front channel interior panned so they will be heard interior panned so they will be heard in mono as is commonly practiced in in mono as is commonly practiced in the film industry...

Page 49: ...he Surround channel instead of paying attention to heard in the Surround channel instead of paying attention to the action on the screen you the action on the screen you have a have a problem Too much...

Page 50: ...o With it becoming the norm to source live feeds or audio from a source live feeds or audio from a digital recorder phase correction digital recorder phase correction is essentially unnecessary as no...

Page 51: ...ts The headroom of the encoder and decoder are sufficient for headroom of the encoder and decoder are sufficient for any of the requirements above any of the requirements above 6 6 6 6 Stereo Stereo S...

Page 52: ...thod is to emulate Dolby Surround This is common in console games This method common in console games This method lets you place sounds at each of lets you place sounds at each of the four cardinal po...

Page 53: ...iple streams of audio that are engine can output multiple streams of audio that are pre panned to L R C and S pre panned to L R C and S the Dolby the Dolby Phase Positioner can also encode these and P...

Page 54: ...igure 7 2 Signal Flow for Game Encoding Figure 7 2 Signal Flow for Game Encoding The resulting signal has the same audio processing as other true The resulting signal has the same audio processing as...

Page 55: ...eo generation of sound files for use in video games and games and the like The output of the encoder can not be monitored without additional circuitry or signal the like The output of the encoder can...

Page 56: ...ut for 3 Adjust the Rt output for 3 dB relative to unity gain or dB relative to unity gain or as appropriate for your situation as appropriate for your situation Alternate Method Alternate Method Put...

Page 57: ...aders pans from back bringing down the 2 back faders pans from back to front will occur Reversing this action w to front will occur Reversing this action will pan from front to back ill pan from front...

Page 58: ...her virtualized for playback over a playback over a conventional pair of speakers conventional pair of speakers AUDIO AUDIO MIXER MIXER F S GAME MODE F S GAME MODE SOUND ELEMENT SOUND ELEMENT MUSIC AN...

Page 59: ...hase shift for that channel degree of phase shift for that channel The all pass networks are designed so that over the The all pass networks are designed so that over the range of the surround bandpas...

Page 60: ...nerates the calibration noise used during the speaker system setup is added to calibration noise used during the speaker system setup is added to the output of the input level the output of the input...

Page 61: ...bsite at at www dolby com www dolby com Below is information on local Dolby offices Please contact Below is information on local Dolby offices Please contact the nearest office for assistance the near...

Page 62: ...nt dolby com trademarkagreement dolby comor by contacting Dolby or by contacting Dolby Laboratories at any of the locations given in Laboratories at any of the locations given in Section 9 1 Contactin...

Page 63: ...boratories maintains listings on the Dolby Web Page encoding Dolby Laboratories maintains listings on the Dolby Web Page www dolby com www dolby com and and in print To keep these lists current studio...

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