Dolby Laboratories SDU4 Technical Information

Dolby Surround Mixing Manual Part No. 91536 Issue 2

Dolby Surround Mixing Manual 2-1 Chapter 2 Technical Guidelines 2.1 Equipment from Dolby Laboratories The equipment described below exists in two vers

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-2 Both the SEU4 and SDU4 are available for purchase from Dolby professional produ

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-3 2.2.2 Control Rooms In order to achieve even Surround channel dispersion, Dolby

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-4 2.2.3 Remote Trucks Remote trucks producing live shows offer a challenge for Ce

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-5 consumer level to correct channel imbalances introduced during transmission or

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-6 MONITORRLSSC Figure 2-7 Incorrect Soffit and Center Speaker Placement The Surro

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-7 2.3.2 Center Channel Speaker The Center channel speaker is used to anchor dial

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-8 This produces an eye/ear conflict, since the visual and audio images don’t matc

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-9 Figure 2-12 Ideal Setup—All Speakers Above Screen Figure 2-13 Ideal Setup—All

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-10 only option for the Center channel. The Dolby SDU4 allows for the smaller Cent

Dolby Surround Mixing Manual Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. S05/12280/16103 © 2005 Dolby Laboratories

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-11 Figure 2-16 Vertical Location of Surround Speakers in Control Room 2.3.6 Audi

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-12 shown in Figure 2-18. A few manufacturers have installed patch points in the p

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-13 FROMBUSSOUTPUTFROMBUSSOUTPUTFROMBUSSOUTPUTFROMBUSSOUTPUTTO MAINMONITORAMPSTO M

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-14 When producing home video releases, experience has proven that lowering the ov

Dolby Surround Mixing Manual Chapter 2 - Technical Guidelines 2-15 Figure 2-21 Tektronix 760 Phase Scope Display of Center Channel Information T

Dolby Surround Mixing Manual 3-1 Chapter 3 System Installation 3.1 Signal Routing Audio Connections 3.1.1 Inputs and Outputs The audio inputs and ou

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-2 We strongly recommend that all audio interconnections employ twin-core shielded

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-3 Note: Some equipment (not from Dolby Laboratories!) has balanced non-floating

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-4 3.2.2 Basic Recording Setup with Film Panning Console The most versatile consol

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-5 CONSOLESEU4 RECORDER SDU4LLLLLRRRRRLLRRLLLRRRCCSSOutput 1MonitorOutMonitorInOutp

Dolby Surround Mixing Manual iii Table of Contents List of Figures ...

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-6 CONSOLE SEU4 SDU4LLLRRRLLRRLLLRRRCCSSOutput 1Output 1Output 2Output 2ttttLRTOBRO

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-7 units are in the monitoring chain, not the recording chain. Such monitoring can

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-8 3.4.2 External Processing Loop (EPL) Loop Switch The SEU4 can be used with an e

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-9 Figure 3-12 CAT 344 Card Switches and Jumpers 3.5.2 Center Speaker Switch When

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-10 Troubleshooting Tip: If a Center speaker is not in use and left and right info

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-11 Figure 3-16 Remote Fader Switch Detail Troubleshooting Tip: If the volume con

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-12 Table 3-1 EPL Connections Pin Signal 1 Ground 2 Loop Send Surround 3 Loop Send

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-13 Figure 3-18 Detail of Jumper Modification for Bass Splitting 3.6.2 Time Delay

Dolby Surround Mixing Manual Chapter 3 - System Installation 3-14 Table 3-2 Delay Switch Settings Setting Delay 0 20 ms 1 30 ms 2 40 ms 3 50 ms

Dolby Surround Mixing Manual 4-1 Chapter 4 System Setup 4.1 Encoder Alignment Correct electronic alignment is a must for proper surround mixing. Perfo

Dolby Surround Mixing Manual iv 3.5.1 Internal Switches—CAT 344 information ... 3-8 3.5.2 Center Speaker Sw

Dolby Surround Mixing Manual Chapter 4 - System Setup 4-2 Figure 4-1 Adjusting the Center Input Trim Control 9. Apply the 1 kHz reference tone

Dolby Surround Mixing Manual Chapter 4 - System Setup 4-3 2. Adjust the left and right inputs, as shown in Figure 4-2, to light both green LEDs.

Dolby Surround Mixing Manual Chapter 4 - System Setup 4-4 4.3.1 ANSI/SMPTE 202M X-Curve When in large mixing rooms, defined as greater than 5300

Dolby Surround Mixing Manual Chapter 4 - System Setup 4-5 4.3.3 Recording Studios—Music Mixing There are perhaps more arguments over what equali

Dolby Surround Mixing Manual 5-1 Chapter 5 Mixing Techniques 5.1 Announcers and Dialogue Traditionally, dialogue is placed only in the Center speaker

Dolby Surround Mixing Manual Chapter 5 - Mixing Techniques 5-2 is now directed to a single point source, the Center speaker, we perceive it as al

Dolby Surround Mixing Manual Chapter 5 - Mixing Techniques 5-3 in the Surround channel. This results in out of phase or inverted information in t

Dolby Surround Mixing Manual Chapter 5 - Mixing Techniques 5-4 inconsistencies between the two stereo channels. The viewer usually recognizes the

Dolby Surround Mixing Manual Chapter 5 - Mixing Techniques 5-5 designed to be used with their own decoders are another issue. The real question i

Dolby Surround Mixing Manual Chapter 5 - Mixing Techniques 5-6 heard in the Surround channel instead of paying attention to the action on the scr

Dolby Surround Mixing Manual v 7.5 Dolby Surround Game Mode Encoding... 7-2 7.6 Modification

Dolby Surround Mixing Manual 6-1 Chapter 6 Live Broadcast Applications 6.1 Transmission Path Considerations Because fiber optic and satellite transmis

Dolby Surround Mixing Manual Chapter 6 - Live Broadcast Applications 6-2 6.5 Headroom The amount of available headroom depends on the final distr

Dolby Surround Mixing Manual 7-1 Chapter 7 Video Games and Multimedia 7.1 Introduction Dolby® Surround has become a popular tool for video game and mu

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-2 By adding an inverter, multiplication by –1, to the game audio tool kit,

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-3 Dolby Surround Game Mode is designed to assist computer game developers w

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-4 Once the F and S signals are prepared, they are recorded in two channels

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-5 7.8 SEU4 Game Mode Alignment If the encoder has been aligned for normal

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-6 LtRtPAN PAN PANGAIN GAIN GAINPHASEPHASEPHASEINPUTMODULESFRONTINPUTSURROUN

Dolby Surround Mixing Manual Chapter 7 - Video Games and Multimedia 7-7 Figure 7-7 shows how the various sound elements may join together in the

Dolby Surround Mixing Manual 8-1 Chapter 8 Theory of Operation 8.1 Encoder Figure 8-1 is the block diagram of a Dolby® Surround encoder. LRLtRtC -3 dB

Dolby Surround Mixing Manual vi List of Figures Figure Description Page 2-1 Dolby Model SEU4 and SDU4 ...

Dolby Surround Mixing Manual Chapter 8 - Theory of Operation 8-2 methods. For this reason, signals panned to the center of the left/right bus wil

Dolby Surround Mixing Manual 9-1 Chapter 9 Miscellaneous Information 9.1 Contacting Dolby Laboratories In addition to its headquarters in San Francis

Dolby Surround Mixing Manual Chapter 9 - Miscellaneous Information 9-2 Japanese Liaison Office Dolby Laboratories International Services, Inc. Ja

Dolby Surround Mixing Manual Chapter 9 - Miscellaneous Information 9-3 9.4 Dolby Surround Software Lists To inform consumers of programs, CDs, ga

Dolby Surround Mixing Manual vii 4-4 Standard X-Curve ... 4-4

Dolby Surround Mixing Manual viii List of Tables Table Description Page 3-1 EPL Connections .....

Dolby Surround Mixing Manual 1-1 Chapter 1 Introduction Dolby® Surround is a format that enables the production and delivery of multi-dimensional soun