Dolby Laboratories CP45 Manual de usuario

MODEL CP45

CINEMA PROCESSOR

Users' Manual

USERS' MANUAL

FOR

MODEL CP45 CINEMA PROCESSOR

Dolby Laboratories Inc

U.S.A. 100 Potrero Avenue, San Francisco, CA 94103

Tel: 415-558-0200; Fax: 415-863-1373

U.K. Wootton Bassett, Wiltshire SN4 8QJ, England

Tel: 01793-842100; Fax: 01793-842101

Dolby is a registered trademark of Dolby Laboratories Licensing Corporation.

S95/10750

Dolby Part No. 91388

TABLE OF CONTENTS

INTRODUCTION

SECTION 1

OPERATING INSTRUCTIONS ............................................................................................ 1-1

A. NORMAL OPERATION

1. Initial Power-Up..................................................................................................1-1

2. Format Selection..................................................................................................1-1

3. Local (Front-Panel) Fader..................................................................................1-3

4. Remote Faders .....................................................................................................1-3

5. Mute Function......................................................................................................1-3

B. OPERATION WITH AUTOMATION SYSTEM ....................................................... 1-4

C. BYPASS OPERATION................................................................................................... 1-4

SECTION 2

MAINTENANCE AND ADJUSTMENTS........................................................................... 2-1

A. SOUNDHEAD MAINTENANCE............................................................................... 2-1

B. PRINT CLEANLINESS .................................................................................................. 2-2

C. DOLBY LEVEL ADJUSTMENT................................................................................... 2-2

SECTION 3

TROUBLESHOOTING ............................................................................................................ 3-1

A. DURING THE SHOW

1. If Film Sound Is Lost ..........................................................................................3-1

2. If One Channel Fails or is Distorted................................................................3-2

3. If Switching to Bypass Does Not Restore Sound..........................................3-2

4. Excessive or Inappropriate Sound from the Surround Speakers .............3-3

B. BETWEEN SHOWS ........................................................................................................ 3-3

C. WHEN THE THEATRE IS CLOSED .......................................................................... 3-4

D. TROUBLESHOOTING CHART .................................................................................. 3-6

APPENDIX A

HOW TO TELL A STEREO OPTICAL PRINT

FROM A MONO PRINT ........................................................................................................A-1

APPENDIX B

DOLBY TEST AND DEMONSTRATION FILMS........................................................... B-1

1. Cat. No.69T: Dolby Tone ................................................................................ B-1

2. Cat. No.251: Jiffy Test Film ............................................................................ B-1

3. Cat. No.351 Stereo Demonstration Film: “listen . . .” ............................... B-3

4. Other Test Films ................................................................................................. B-3

APPENDIX C

CP45 MODULE DESCRIPTIONS........................................................................................ C-1

APPENDIX D

ABOUT DOLBY FILM SOUND FORMATS .....................................................................D-1

1. How Dolby Noise Reduction Works..............................................................D-1

2. About Dolby SR..................................................................................................D-1

3. Why the Dolby Level Adjustment Is Important..........................................D-3

4. The Consumer Dolby Noise Reduction Systems.........................................D-3

APPENDIX E

HOW FOUR CHANNELS ARE DERIVED FROM

DOLBY STEREO OPTICAL PRINTS...................................................................................E-1

APPENDIX F

OPTICAL BASS EXTENSION ...............................................................................................F-1

APPENDIX G

CINEMA SOUND AND THE EVOLUTION

OF DOLBY FILM SOUND.....................................................................................................G-1

INTRODUCTION

WHY A CINEMA PROCESSOR?

Originally, stereo sound on motion picture film was possible only by means of

magnetic striping, which was introduced in the 1950s. Although capable of

very good sound, this was such a costly approach that by the 1970s relatively

few films were being released with stereo soundtracks.

Then in 1975 Dolby Laboratories introduced the stereo optical soundtrack

originallyknownasDolbyStereo.Itprovidedthemultichannelsoundassociated

with magnetic soundtracks in a much more practical format.

Getting high-quality stereo sound from an optical soundtrack required the

application of several new processes. It was necessary, for example, to

electronically “fold” four sound channels into just two physical tracks on the

film, and then “unfold” (decode) them on playback in the theatre. Dolby noise

reduction,aformofsignalprocessingthatgreatlyexpandsthelimiteddynamic

range of optical soundtracks, was also used, and requires its own special

playback processing circuitry.

Thus the cinema processor was introduced as a new element in theatre sound

systems. In addition to properly decoding Dolby encoded soundtracks, Dolby

processorssuchastheCP45alsoprovideequalizationcircuitsthatoptimizethe

frequency range of the projector’s optical soundhead and the theatre

loudspeakers. The diagrams below show the role cinema processor plays in

bringing your audiences thrilling, multichannel Dolby sound.

About The Dolby CP45

Once installed, the Dolby CP45 Cinema Processor becomes the heart of your

theatre sound system. All sound sources are connected to the CP45, which

processes their signals appropriately and feeds them to the power amplifiers.

TheDolbyModelCP45providesthehighperformanceforwhichallprocessors

manufactured by Dolby Laboratories are known in a new cost-effective,

integrated design. Its many features include a stereo optical preamp with

precise slit-loss correction, processing for both Dolby A-type and Dolby SR

soundtracks,anadvanced2:4-channeldecoder,andmulti-bandscreenspeaker

equalization.Theseadvancedcircuitsensureaccuratereproductionofallfilms

with Dolby analog soundtracks, and permit the theatre to use the widely-

respectedname“Dolby”onthemarqueeandinadvertisingtoidentifypresenta-

tions of Dolby releases.

Additional standard features of the CP45 are a built-in fader with remote

facilities,simplepush-buttonsoundtrackformatselection,andcomprehensive

fail-safefeatures that includea built-inbypass system. The unitalso interfaces

readily with theatre automation systems.

The CP45 supports the following sound formats:

Format Number

Mono 01

Dolby A-type (stereo) 04

Dolby SR (stereo) 05

Non sync 1 60

Non sync 2 / Aux 61

Microphone 64

About This Manual

ThisUsers’Manualhasbeenpreparedspecificallytohelpprojectionistsgetthe

most from the Model CP45 and the theatre sound system once it has been

installed and aligned. (Installation and alignment instructions are supplied to

the local distributor or installation company). We suggest that you keep this

manual readily available.

The manual is organized as follows:

• Section 1, Operating Instructions, covers the basic control functions

and operation of the CP45.

• Section 2, Maintenance and Adjustments, contains tips for

maintaining the CP45 and the theatre sound system.

iii

• Section3,Troubleshooting,willhelpyoutrackdownproblemsinthe

soundsystemwithouttestequipment.Itconsistsofatroubleshooting

chart and procedures to follow during a show, between shows, and

after closing.

• The Appendices contain valuable background information which

will help you to get the most out of the Model CP45 and your theatre

sound system.

For the sake of clarity, boldface type is used for all specific references to the

CP45 controls and their labels, such as Bypass, and front-panel Fader. In

addition, indicator lights on the CP45 are referred to in the text as LEDs (light-

emitting diodes).

1-1

SECTION 1

OPERATING INSTRUCTIONS

A. NORMAL OPERATION

1. Initial Power-Up

Each time the CP45 is connected to power, it automatically sets itself to

the format it was in when power was removed unless the power has

been removed for more than a week. Under these circumstances the

wake-up state is:

• Format 01 Mono

• Front-panel (Local) fader activated

•Proj 1 or Proj 2 LED illuminated, indicating the externally-

selected projector that is active (Proj 1 can be set to be selected

automatically if no external selection has been made although it

is usual for the individual projectors to be selected for bypass

mode flexibility).

2. Format Selection

Select the desired film soundtrack format or your non-sync source by

pressing the appropriate button. The LED in the button illuminates to

confirm that the format was selected. The formats are as follows:

•01 Mono: for all optical prints of any vintage with conventional

mono optical (“Academy”) soundtracks.

•04 Dolby A-type: for Dolby Stereo releases, except those marked

SR or Digital.

•05 Dolby SR: for releases marked as having a Dolby SR

soundtrack. (If your CP45 is not equipped with the SR circuit

needed to play SR copies, 04 Dolby A-type can be selected.)

•60 Non-sync 1: for your music tape or CD player.

•61Aux/Non-sync2: this format may be programmed in a number

ofdifferent ways dependingon theoptional equipment fittedand

the installation. Possible options include:

Magnetic soundtracks from projectors or followers with

appropriate magnetic preamplifiers.

Extra sound sources (consult your service engineer for details).

1-2

Figure 1. CP45 Front Panel Control

SignalSignal

SystemSystem

FormatFormatFaderFader

faderfader

activeactive NormalNormal

BypassBypass

LeftLeft

RightRight

CenterCenter

Sub WooferSub Woofer

SurroundSurround

MicMic

MonoMono

1010

Projector 2Projector 2

Projector 1Projector 1

Non-sync 1Non-sync 1

Aux/Non-sync 2Aux/Non-sync 2

Dolby Stereo A-typeDolby Stereo A-type

Dolby Stereo SRDolby Stereo SR

6161

6060

6464

0505

0101

0404

FADER ACTIVE INDICATOR

Shows if the front panel fader

has been selected.

FRONT PANEL FADER

Controls the auditorium level

when selected. The control

should be set at or near 7 for

normal operation.

PROJ 1/PROJ 2 INDICATORS

Show which projector has been

selected.

Normal fader setting.

FORMAT 01

For mono optical

soundtracks.

FORMAT 04

For Dolby Stereo soundtracks

except those marked SR or SR•D.

FORMAT 05

For Dolby Stereo SR

soundtracks.

FORMAT 60

For non-sync, background

music from a cassette

deck or CD player.

FORMAT 61

For extra sound sources.

BYPASS INDICATOR

Flashes if the CP45 is in bypass mode.

The CP45 will automatically switch to

bypass if the internal power supply fails.

SIGNAL PRESENCE INDICATORS

These will light if a signal is present

on the indicated channel.

BYPASS/NORMAL SWITCH

For manually switching to bypass if

there is a problem. Switches to a

separate power supply.

FADER ACTIVE BUTTON

Switches the fader control back

to local (this fader) if remote

faders are installed.

FORMAT 64

Selects the microphone for public

announcements. If the CP45 is in

bypass mode, push and hold this

button to make an announcement.

1-3

•64 Mic: for public address announcements in the theatre.

Thefilm soundtrackformat numbers used onthe CP45front paneloften

appear on the film can and leader. If these numbers are not supplied

and you are not sure if a print is mono or stereo optical, see Appendix

A for a means to distinguish mono from stereo optical soundtracks.

If you are playing an early Dolby Stereo release and it is marked as

format 03 “Dolby Stereo without surround,” select format 04 Dolby A-

type.

3. Front Panel (Local) Fader

The fader on the front panel of the CP45 controls the volume level in the

theatre in all operating modes. After the CP45 has been correctly

installed, setting the fader to 7 will play a Dolby film at the level at

which it was mixed.

Although a minor adjustment in playback level might be required

under unusual circumstances, you should avoid significant deviations

from the correct level (7) established by the installer. If the playback

level is set too low, dialogue will be hard to understand; too high a level

will give rise to complaints from the audience and under extreme

circumstances can damage the theatre’s sound system.

4. Remote Faders

Inadditiontothefrontpanel (local)fadertheCP45canalso be controlled

by an external remote fader.

If a remote fader has been installed, it is activated by pressing the select

button on the remote. The local front panel fader LED will go off to

indicate that the remote fader has been activated. To regain local

control, press the “fader active” button located below the front panel

fader. The button will have no effect if there are no remote faders.

5. Mute Function

When you press the mute button on the remote unit (if installed), the

volume will automatically fade all the way down. When you press the

button again, the volume will automatically rise to the level set by the

fader which is in control of the level (local or remote fader).

The Mute button is useful if the film breaks or runs out with the

projector active since it supresses the very loud signal that occurs when

a leader or tail passes through the sound gate.

If the CP45 is not conveniently close to the projector and there is a

remote fader at the projector, use the following procedure to start the

show:

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