Dolby Laboratories CP650 User Manual
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Dolby Laboratories CP650 User Manual

Dolby Laboratories CP650 User Manual

Digital cinema processor
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Model CP650
Digital Cinema Processor
User's Manual
Issue 3
Part Number 91570

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Summary of Contents for Dolby Laboratories CP650

  • Page 1 Model CP650 Digital Cinema Processor User’s Manual Issue 3 Part Number 91570...

  • Page 2: Limitation Of Liability

    Dolby, Pro Logic, and the double-D symbol are registered trademarks of Dolby Laboratories. Auditorium Assist and Part Number 91570 Surround EX are trademarks of Dolby Laboratories. All other trademarks remain the property of their respective owners. Issue 3  2006 Dolby Laboratories, Inc. All rights reserved.

  • Page 3: Table Of Contents

    2.2.3 Auditorium Fader ............... 2-8 2.2.4 Assigning Preset Fader Levels ........... 2-8 2.2.5 Automatic Selection of the Dolby Digital Format ..... 2-9 2.2.6 Setting the Auto Dolby Digital Target ........2-10 2.2.7 Quick Sound Check—Rotating Pink Noise ......2-10 2.2.8 Assigning Front-Panel Buttons to Formats ......
  • Page 4 Troubleshooting Chart................4-3 Appendix A Advanced Operations Using Auditorium Assist .................A-1 Displaying the Event Log ................A-2 Display Information About This CP650 Unit .........A-3 Format 80/81 PCM Options ..............A-4 Remote Address..................A-4 Appendix B The Evolution of Dolby Film Sound Appendix C Reference Information How to Identify Soundtracks on Prints ...........C-1...
  • Page 5 Figure 2-2 Front-Panel Display Showing All Possible Channels Active ........2-2 Figure 2-3 Front-Panel Display Showing Dolby Digital Film Playing ........2-3 Figure 2-4 Front-Panel Display Showing Dolby Digital Surround EX Film Playing ....2-3 Figure 2-5 Front-Panel Display when Running Earlier Software..........2-3 Figure 2-6 CP650 Setup Menu Control Buttons................
  • Page 6 Virtual Dolby Technologies Test DVD Track List...

  • Page 7: Chapter 1 Introduction

    CP650 hardware. Moreover, updates to the audio coding used for Dolby Digital soundtracks, which are included from time to time right on Dolby Digital release prints, download automatically into the CP650 the first time such a print is played in the cinema.

  • Page 8: Troubleshooting Chart

    About This Manual This user’s manual has been prepared specifically to help projectionists get the most from the CP650 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.

  • Page 9: Chapter 2 Operating Instructions

    ® Dolby CP650 Digital Cinema Processor User’s Manual Chapter 2 Operating Instructions The CP650 Front Panel Format Buttons Projector Signal Indicators Bypass Power Supply Used to select the format: P1 and P2 show which projector's Failure Indicator Mono (user-definable) output is being processed by the...

  • Page 10: Front-Panel Display

    L Le C Re R Rs Bsr Bsl Ls SW Figure 2-2 Front-Panel Display Showing All Possible Channels Active Figure 2-2 shows the display that is active when the CP650 is processing and playing a digital signal connected to the CP650 input with all channels active. The top two ®...

  • Page 11: Figure 2-3 Front-Panel Display Showing Dolby Digital Film Playing

    Ls SW Figure 2-3 Front-Panel Display Showing Dolby Digital Film Playing Figure 2-3 shows the display when the CP650 is playing a Dolby Digital soundtrack with no Dolby Digital Surround EX decoder board installed. Since there are no Le, Re, Bsr, or Bsl channels present in this configuration, no signal bars are indicated for those channels.

  • Page 12: Level Display

    2.1.6 Bypass Power Button The bypass power button operates the main power supply for the CP650. In the O position, the CP650 is powered by the main supply. As with other Dolby cinema processors, the CP650 has a separate backup (bypass) power supply. In the O position, the unit is powered by the built-in bypass power supply, and the power button glows red.

  • Page 13: Setup Control Panel Access Door

    Use the right-hand button to accept the setting displayed on the front-panel screen and store it in CP650 memory. Any changes to settings occur immediately but are not saved until this button is pressed. Leaving the current menu before pressing the button discards the change.

  • Page 14: Normal Operation

    CP650 has switched to emergency bypass. 2.2.1 Power On Each time the CP650 is connected to power, it automatically sets itself to the selected wake-up state. During the CP650 installation, the power-on state of the unit was configured from the following choices: •...

  • Page 15: Main Fader

    • 04 Dolby A-type—For Dolby releases, except those marked SR or Digital. • 05 Dolby SR—For releases marked as having a Dolby SR (Spectral Recording) soundtrack or for Dolby Digital prints if your CP650 is not equipped with digital playback capability.

  • Page 16: Auditorium Fader

    Operating Instructions 2.2.3 Auditorium Fader If an analog auditorium fader pot (not a Dolby Cat. No. 779 Digital Remote Unit or Cat. No. 771 Remote Fader) has been installed, it is activated by performing the following menu steps: Fader Setting...

  • Page 17: Automatic Selection Of The Dolby Digital Format

    2.2.5 Automatic Selection of the Dolby Digital Format CP650 units equipped to play Dolby Digital films can be set up to sense the presence of Dolby Digital data on the film and automatically switch the CP650 to the Dolby Digital format from any other film format. In other words, if the CP650 is operating in format 01, 04, 05, or 11, it will automatically switch to format 10 when a Dolby Digital film is detected.

  • Page 18: Setting The Auto Dolby Digital Target

    2.2.6 Setting the Auto Dolby Digital Target This menu item allows you to select which format button will activate when a Dolby Digital film is detected automatically. If you have assigned the Dolby Digital format to multiple buttons, choose the button you wish to use.

  • Page 19: Assigning Front-Panel Buttons To Formats

    When you press mute, the volume automatically fades all the way down on all channels. The button will flash, indicating that the CP650 outputs are muted. When you press the button again, or select a new format, the volume automatically rises to the level set by the fader.

  • Page 20: Selecting The Power-On Format

    2.2.10 Selecting the Power-On Format Each time the CP650 is connected to power, it automatically sets itself to the selected power-on format. Use this menu item to store a specific power-on format or to select the format that was active when power was turned off.

  • Page 21: Bypass Operation

    If the front-panel bypass power supply failure indicator (located directly above the main fader knob) is on, the CP650 will not operate in Bypass mode. Note: The CP650 will not operate, even in Bypass mode, if there is a fault in any of the following areas: •...
  • Page 22 Virtual Dolby Technologies Test DVD Track List...

  • Page 23: Chapter 3 Maintenance And Calibration

    Cat. No. 69T test film is required for proper maintenance of your sound system. We also recommend that you keep on hand the Dolby Cat. No. 251 Jiffy test film, and run it regularly to check the theatre sound system thoroughly (see Appendix C).

  • Page 24: Dolby Level Calibration

    1. On projector 1, clean the optics as described earlier. 2. Thread and play the Cat. No. 69T Dolby tone test film. Ensure that the arrow is going in the correct direction. The film emulsion should face away from the screen.

  • Page 25: Automatic Calibration

    Optical Level Adjust, Projector 1 menu. 2. Press to begin the automatic level calibration for L O O R projector 1. With the Dolby tone test film running, the CP650 Please Wait. ..O O automatically calibrates the Left and Right channels to the Dolby tone playing on the film.

  • Page 26: Film Print Cleanliness

    The Dolby Digital print format has robust error-correction information encoded along with the audio data, and the CP650 uses a powerful digital error-correction technique, allowing the data to be decoded perfectly even if scratches and dirt are present.

  • Page 27: Figure 3-1 Digital/Analog Track Wear

    (by which time the picture quality is usually unacceptable, as well). At this point, wear may also exceed the error correction capabilities of the CP650, and the processor will automatically switch to playing the analog Dolby SR track.
  • Page 28 Virtual Dolby Technologies Test DVD Track List...

  • Page 29: Chapter 4 Troubleshooting

    If Film Sound Is Lost If film sound is lost, take the following steps: 1. Check that the correct format button is glowing on the CP650 front panel, and that the correct projector (P1 or P2) is selected. 2. Verify that the lamp or LED is on in both the analog and digital (if present) film readers.

  • Page 30: Troubleshooting Chart

    2. If you are showing a mono film and the Center channel has failed or is distorted, switch the CP650 to Bypass mode so that the mono signal is fed to the still- functioning Left and Right channels. Turn off the power amplifier for the Center channel.
  • Page 31 Call your local service engineer. No sound, front panel is dark, No power to CP650. See if the AC mains panel circuit breaker feeding the CP650 is tripped. bypass Verify that all power connectors are fully inserted into their sockets.
  • Page 32 Digital film reader not working. Film not threaded correctly in digital reader. Bypass p System is in Bypass mode. Switch the CP650 out of Bypass mode by pressing the front-panel ower button is illuminated, bypass but the front panel is dark. There is power button.
  • Page 33 Format 10 requires the Dolby Digital Cat. No. 773 board. selection, and gives “Format for that format, or that part of the system is not Formats 13, 80, or 81 require the Cat. No. 790 Dolby Digital Unavailable” message. working.
  • Page 34 Virtual Dolby Technologies Test DVD Track List...

  • Page 35: Appendix A Advanced Operations

    Use of this feature requires a Dolby Cat. No. 735 microphone mounted along the rear wall of the auditorium. After installation of the microphone, the installation engineer performed the initial reference calibration.

  • Page 36: Displaying The Event Log

    Displaying the Event Log The event log provides useful information when explaining any problems to your service engineer. The event log stores entries on the operation of the CP650. It can be useful in troubleshooting or tracking subtle system failures. Also, Auditorium Assist fail parameters are stored in the event log.

  • Page 37: Display Information About This Cp650 Unit

    1. Press multiple times, or press and hold the button while rotating the front-panel knob to move to the About this CP650 screen. This menu is made up of four menu screens. 2. The first information screen displays the version number of the About this CP650: System v.a.b.c.d...

  • Page 38: Format 80/81 Pcm Options

    CP650 Digital Cinema Processor User’s Manual Advanced Operations Format 80/81 PCM Options Use this menu to change the settings for processing a PCM digital input to the CP650. ® Dolby Pro Logic decoding can be applied to the signal if desired.

  • Page 39: Appendix B The Evolution Of Dolby Film Sound

    Going to the movies today is more exciting and involving than ever before, thanks in large part to a continuing effort to improve film sound undertaken by Dolby Laboratories in the early 1970s. Indeed, the history of cinema sound over the past ®...
  • Page 40 ® Dolby CP650 Digital Cinema Processor User’s Manual The Evolution of Dolby Film Sound speakers. The result was to ignore the improved high-frequency response of the newer, better units. To forestall compatibility problems, in the late 1930s a de facto standardization set in, the cinema playback response that today is called the Academy characteristic.
  • Page 41 The breakthrough was the development by Dolby Laboratories of a highly practical 35 mm stereo optical release print format originally identified as Dolby Stereo. In the space allotted to the conventional mono optical soundtrack are two soundtracks that not only carry left and right information as in home stereo sound, but are also encoded with a third center-screen channel and—most notably—a fourth surround...
  • Page 42 Developments like Dolby SR and Dolby Digital ensure that the soundtrack itself remains one of the strongest links. But the extreme fidelity of the latest Dolby formats can reveal the quality of each step in the recording, mixing, and dubbing...
  • Page 43 Dolby technology is a means, not an end. It can be likened to an artist’s palette that provides the director with a full range of colors, where before there were but a few.
  • Page 44 Virtual Dolby Technologies Test DVD Track List...

  • Page 45: Appendix C Reference Information

    ® Dolby CP650 Digital Cinema Processor User’s Manual Appendix C Reference Information How to Identify Soundtracks on Prints Edge of film Dolby Digital soundtrack Analog soundtrack Picture area Figure C-1 Film Sound Track Layout ® A Dolby Digital film print, a stereo analog optical print (A-type or SR), or a mono analog optical print should be identified as such on both the film can and leader.

  • Page 46: About Dolby Digital Surround Ex

    Figure C-2 Identifying Types of Film Sound Tracks There is no way to tell by visual inspection if a stereo print is Dolby A-type or Dolby SR encoded. The majority of stereo prints are Dolby SR encoded. If you are in doubt, listen to the track and compare playback quality in formats 04 and 05.

  • Page 47: Figure C-3 Surround Speaker/Amplifier Switching For 5.1-Channel

    Reference Information A Center screen channel is necessary to ensure the precise localization of front sounds for all viewers, including those seated off to the sides. Dolby Digital Surround EX brings similar benefits to the surround sound field. With Surround EX, a Back Surround channel is reproduced by the speaker array at the back of the theatre, while Left Surround and Right Surround channels are reproduced by the side arrays.

  • Page 48: Test And Demonstration Films

    Cat. No. 69T—Dolby Tone Figure C-5 Cat. No. 69T Dolby Tone Test Film The Cat. No. 69T is required to maintain your theatre system. The Dolby tone recorded on the film is used during automatic calibration of the operating level in the CP650.

  • Page 49: List Of Cat. Numbers Used

    The Cat. No. 1010, 1011, and 1012 test films are specialized digital test films for use only by trained engineers with special test equipment, and need not be kept on hand at the theatre. They are used to set up the Dolby Digital portions of the CP650. List of Cat. Numbers Used •...
  • Page 50 Virtual Dolby Technologies Test DVD Track List...

  • Page 51: Appendix D Cp650 Menu Listing

    ® Dolby CP650 Digital Cinema Processor User’s Manual Appendix D CP650 Menu Listing The options shown in bold are the default settings when the unit was shipped from the factory. menu menu Notes This is the top-level Format and CP650 Status Display menu display.
  • Page 52 ® Dolby CP650 Digital Cinema Processor User’s Manual CP650 Menu Listing CP650 User Menu, Continued menu menu Notes Mutes CP650 if not Disabled/Enabled Auto Mute: detecting Dolby Format 80/81 PCM Options Digital input L/R Stereo/Pro Logic Decode: bitstreams. Mute Fade-In Time 0.2–5 seconds...

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