Dolby Laboratories 737 - page 33

Model 737 Soundtrack Loudness Meter - Leq(m) Background

A-7

Figure A-4 Comparison of weighted and un-weighted Leq.

Figure A-5 compares the maximum peak level reached in each sample with the weighted

Leq(m) value. The slope of the line between the values is now proportional to the dynamic

range: the range between the average level and the loudest peaks on the soundtrack. It

is important to consider the dialogue level in these samples. The concept of associative

loudness (discussed above) is supported by the comparison of dialogue levels of

Spencer's Mountain (1963), an Academy mono film, with the dialogue level of Shine

(1996), a Dolby Digital release. The two films show identical Leq levels, confirming

the supposition that mixers set dialogue levels at a plausible point (associative loudness),

regardless of the format of the release.

Shine Reel 5 (D)

Gakkou No Kaidan (A)

Empire T railer (D)

Twister T railer (D )

Prisoners of the Mountain Trailer (D)

Mars Attacks Trailer (D)

Slayer's R eturn (SR)

Star Wars Trailer (D)

Shine Trailer (D)

ST Generations Reel 2 (D)

Evita Trailer (D)

Indie Temple of Doom (A)

Shine Reel 4

Spencer's Mountain (Mono)

Shine Dialog (D)

L

eq

U

nwe

i

g

h

te

d

Leq

m

CC

IR-weighted

5.6 dB offset

100

95

85

90

60

65

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MAIN

Contents

Main Dolby Laboratories Inc Table of Contents List of Figures List of Tables Chapter 1 Introduction Chapter 2 Operation and Features Chapter 3 Cat. No. 448B Input Adapter Board Chapter 4 Specifications Appendix A Background List of Figures List of Tables Chapter 1 Introduction Chapter 2 Operation and Features 2.1 Front Panel Controls 6/4 - 2 channel switch Start Trip Set Cal 2.1.1 6/4 2 Channel Switch 2.1.2 Input Trimpots 2.1.3 Trip Set 2.1.4 Pushbuttons Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features 2.2 Back Panel Connectors Figure 2-3 Model 737 back panel 2.2.1 Analog Audio Inputs Figure 2-4 Audio input connectors (detail of rear panel) The XLR input connectors for channels 16 use the following wiring convention: 2.2.2 Mon Out 2.2.3 DC Out 2.2.4 Power and Control 2.3 Connection and Calibration 2.3.1 Connecting to an Audio Console 2.3.2 Connecting to a Dolby Cinema Processor 2.3.3 Connecting to a DA10/20 Digital Adapter 2.3.4 Connecting to Non-Dolby Digital Adapters 2.3.5 Connecting to the SDU4 Surround Decoder 2.3.6 Calibration Procedure 2.3.7 Automated Input Adapter Board (Cat. No. 448B) 2.4 Mains Power 2.5 Interface 2.5.1 Grounding Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features 2-10 2.6 Block diagram Figure 2-6 Model 737 block diagram L/Lt C Ls R/Rt Sub Rs Page Chapter 3 Cat. No. 448B Input Adapter Board 3.1 Introduction 3.2 Logic map Model 737 Soundtrack Loudness Meter - Leq(m) Cat. No. 448B Input Adapter Board 3-2 3.3 Component and Connector Layout x2 (Lt/Rt - opt) CAT. NO. 448B Cat. No. 448B Figure 3-1 Cat. No. 448B Interface Adapter 3.4.3 Alignment 3.5 Dubbing studio Page 3.5.1 Alignment Page Chapter 4 Specifications Temperature and Humidity EMC Limits General Appendix A Background A.1 Loudness A.1.1 The Current Situation Page A.2 How Loud Is a Movie? A.3 Standardizing a Measurement Technique for Soundtrack Loudness A.3.1 Alternative Measurement Indices A.4 Analysis of the Data Page Model 737 Soundtrack Loudness Meter - Leq(m) Background A-8 Figure A-5 Comparison of Leq(m) and peak levels Shine demo 1 (Rach. III) Leq CCIR-weighted Peak Level C-weighted, fast 5.6 dB offset dB A.4.1 Verification of the Data Leq CCIR-weighted Peak Level C-weighted, fast