Dolby Laboratories 737 2.2 Back Panel Connectors

Model 737 Soundtrack Loudness Meter - Leq(m) Operation and Features

2-3

2.2 Back Panel Connectors

The back panel has six audio input connectors (shown in detail in Figure 2-4), two output

connectors, and a power/control signal connector (shown in detail in Figure 2-5).

Figure 2-3 Model 737 back panel

2.2.1 Analog Audio Inputs

Although the input stages of Left, Center, Right, and Left Surround are identical, it is

recommended that Left and Right (Ch 1 and Ch 3, also labeled Lt and Rt, respectively)

be used for Lt/Rt measurements of two-channel encoded material. The Right Surround

and Subwoofer channels share a common filter and rectifier so the Subwoofer input is

not normally used except when measuring 5.1-channel material.

Figure 2-4 Audio input connectors (detail of rear panel)

The XLR input connectors for channels 1–6 use the following wiring convention:

Table 2-1 XLR input wiring convention for channels 1-6

Pin Connection

1Chassis

2Audio +

3 Audio -

Ch1 Lt

Left

Dolbyandthedouble-D symbol are trademarks of Dolby Laboratories.

Ch3 Rt

Right

Ch2

Center

Ch4

LeftSurround

Ch5

RightSurround

Ch6

Subwoofer

MonOut DCOut 24Vac

500mA

ACIn~

ACIn~

Ref

Gnd

TripOut

TripOut

TripOut

Gnd

Start/Stop

AnalogAudioInputs

Model737

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Ch1 Lt

Left

Dolbyand the double-D symbol are trademarks of Dolby Laboratories.

Ch3 Rt

Right

Ch2

Center

Ch4

LeftSurround

Ch5

RightSurround

Ch6

Subwoofer

AnalogAudio Inputs

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