Dolby Laboratories SDU4 Manuale Utente

Film-TechThe information contained in this Adobe Acrobat pdffile is provided at your own risk and good judgment.These manuals are designed to facilita

Chapter 2 - Operation and Features52.2.2 Mon Out Figure 2-5 Mon and DC Out, and power/control connectorMon Out is an unbalanced output which, in cali

Chapter 2 - Operation and Features62.2.4 Power and ControlThe 8-pin power and control connector uses the following wiring conventions for the control

Chapter 2 - Operation and Features72.3.2 Connecting to a Dolby Cinema ProcessorThe method for connecting a Dolby cinema processor with the Model 737 d

Chapter 2 - Operation and Features82.3.5 Connecting to the SDU4 Surround DecoderThe Model 737 can interface with the SDU4 either before or after decod

Chapter 2 - Operation and Features92.4 Mains PowerThe Model 737 uses a mains transformer that converts incoming AC to 24 VAC. The transformer has 1 me

Chapter 2 - Operation and Features102.6 Block diagramFigure 2-6 Model 737 block diagramThe six input channels each have a balanced to unbalanced stag

Chapter 2 - Operation and Features11The selection switches are followed by five ideal rectifiers and squaring circuits. The five squared signals are a

12Chapter 3SpecificationsTemperature and HumidityOperating 10o"C to 35o"C, natural convection coolingNon-Operating (Storage) 0o"C to

13Appendix ABackgroundThis Appendix is an edited version of a paper published in the January 1998 SMPTE Journal (Volume 107, Number 1) entitled “Are

Appendix A - Background14This system worked quite well for many years. Dolby Stereo (A-type encoded) films had limited headroom and the resulting cons

Model 737 Soundtrack Loudness Meter - Leq(m) Issue 01 Part No. 91533

Appendix A - Background15In practice, the following undesirable symptoms have arisen: • There are an increasing number of audience complaints that mov

Appendix A - Background16The length of the sound is another important factor in determining the perceived loudness of a sound. It is well known that p

Appendix A - Background17Figure A-2 A-weighting vs. CCIR-weighting curve (offset by 5.6 dB)Although there is no technical parallel between high-level

Appendix A - Background18A.4 Analysis of the Data Figure A-4 shows the relationship between un-weighted (Leq) and CCIR-weighted (Leq(m)) samples. The

Appendix A - Background19Figure A-5 Comparison of Leq(m) and peak levelsFigure A-6 Peak levels in reel 4 of Shine SR ClipA ClipShine Reel 4110105100

Appendix A - Background20Next, examine Figure A-5 again, then Figure A-6, and compare the peak levels in reel 4 of Shine with the Leq. Although this r

iiDolby Model 737 Soundtrack Loudness Meter - Leq(m)User’s ManualSoftware Version 1.0Dolby Laboratories IncorporatedU.S.A. 100 Potrero Avenue, San F

iiiTable of ContentsList of Figures...

vList of Figures2-1 Model 737 front panel ... 22-2

1Chapter 1IntroductionLeq(m) is a term used by Dolby Laboratories to describe the level of annoyance in movie soundtracks. The Leq(m) value is a weig

2Chapter 2Operation and FeaturesThe Model 737 Soundtrack Loudness Meter - Leq(m) is a simple 1U, rack-mountable device that measures the equivalent l

Chapter 2 - Operation and Features32.1.1 6/4 – 2 Channel SwitchLocated to the left of the input trimpots (see Figure 2-2), this switch may be used in

Chapter 2 - Operation and Features42.2 Back Panel ConnectorsThe back panel has six audio input connectors (shown in detail in Figure 2-4), two output