Dolby Laboratories CP650 User Manual
  1. Manuals
  2. Brands
  3. Dolby Laboratories Manuals
  4. Processor
  5. CP650
  6. User manual
Dolby Laboratories CP650 User Manual

Dolby Laboratories CP650 User Manual

Digital cinema sound processor
Hide thumbs Also See for CP650:
Table of Contents

Advertisement

Quick Links

See also: User Manual , Installation Manual
Model CP650
Digital Cinema Sound
Processor
User's Manual
Issue 1
Part No. 91570

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CP650 and is the answer not in the manual?

Questions and answers

Related Manuals for Dolby Laboratories CP650

Summary of Contents for Dolby Laboratories CP650

  • Page 1 Model CP650 Digital Cinema Sound Processor User’s Manual Issue 1 Part No. 91570...
  • Page 2 (including but not limited to damage to software or recorded audio or visual material), or loss of use, revenue, or profit, even if Dolby Laboratories or its agents have been advised, orally or in writing, of the possibility of such damages.

  • Page 3: Table Of Contents

    Appendix A How to Identify Sound Tracks on Prints Appendix B Advanced Operations Display The Event Log................B-1 Display Information About This CP650 Unit .........B-2 Appendix C Test and Demonstration Films Appendix D The Evolution of Dolby Film Sound Appendix E Reference Information List of Cat.

  • Page 5: Chapter 1 Introduction

    This user’s manual has been prepared specifically to help projectionists get the most from the Model 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 7: Chapter 2 Operating Instructions

    Flashes red when activated to fade down. Pressing a format button will cancel mute. Figure 2-1 CP650 Front Panel Front Panel Display Day-to-day operation of the CP650 is performed through interaction with this display.
  • Page 8 Operating Instructions L C R Ls Rs Sw The example above shows the normal display when the CP650 is playing a film with a Dolby Digital soundtrack. The top two lines display the current format selected. The bottom left area contains a bar graph display of the sound signals present on each channel.

  • Page 9: Power Button

    Operating Instructions Power button The power button operates the main power supply for the CP650. In the ON 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 OFF position, the unit is powered by the built-in bypass power supply, and the power button glows red.

  • Page 10: Normal Operation

    OK button will cause the change to be discarded. Note: For convenience, pressing the current format (glowing) button causes the CP650 to immediately return to the top-level screen display. This feature is handy for making a quick change, then returning to normal operation.

  • Page 11: Format Selection

    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 12: Main Fader

    Operating Instructions 2.2.3 Main Fader The main front panel fader knob on the CP650 controls the volume level in the theatre. It works in both normal and bypass operation. When the CP650 has been correctly installed, setting the fader to 7.0 7.0 plays the film at the level at which it was...

  • Page 13: Setup For Automatic Selection Of The Dolby Digital Format

    Setup for 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.

  • Page 14: Assigning Formats To The U1, U2 And Ns Buttons

    CP650 User’s Manual Operating Instructions 2.2.5 Assigning Formats to the U1, U2 and NS Buttons The U1 and U2 buttons (User Format 1 and User Format 2) and the NS button (nonsync) can be assigned to any available format. Then, when the button is pressed, the assigned format will be selected.

  • Page 15: The Mute Function

    When you press the mute button, the volume will automatically fade 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 will automatically rise to the level set by the fader.

  • Page 16: Setting The Front Panel Display Contrast

    2.2.8 Operation With an Automation System When the CP650 in your theatre is connected to automation equipment, the format selection is duplicated elsewhere. In most cases, the front-panel buttons of the CP650 can usually be used to override commands from the automation system; however, as...

  • Page 17: Bypass Operation

    Be sure to follow the troubleshooting procedures and, if necessary, call your service engineer as soon as possible. Note: The CP650 will not operate, even in the bypass mode, if there is a fault in any of the following areas: •...

  • Page 19: Chapter 3 Maintenance And Adjustments

    CP650 User’s Manual Chapter 3 Maintenance and Adjustments Having the very best equipment in your installation does not in itself guarantee that you will always achieve best results. A number of routine maintenance and adjustment procedures, requiring no special test equipment or technical knowledge, are necessary to realize the full potential of the sound system on a day-to-day basis.

  • Page 20: Replacing The Exciter Lamp (Cat. No. 700)

    CP650 User’s Manual Maintenance and Adjustments 3.1.3 Replacing the Exciter Lamp (Cat. No. 700 Digital Soundhead) The exciter lamp in the Cat. No. 700 Digital Soundhead has been designed for long life and should provide over 8,000 hours of reliable use under normal circumstances.

  • Page 21: Dolby Level Calibration

    Dolby Level Calibration Proper decoding of Dolby encoded soundtracks requires careful level matching of each channel of each soundhead and the CP650. When the CP650 was first installed, the technician made this adjustment for you. We recommend that you routinely perform these steps to compensate for the normal aging of the soundtrack light source.

  • Page 22: 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. However, best performance will be obtained if the print is kept clean. Standard film...
  • Page 23 By this time the picture quality is usually unacceptable too. At this point, wear also may exceed the error correction capabilities of the CP650, and the processor will automatically switch to playing the analog Dolby SR track.

  • Page 25: Chapter 4 Troubleshooting

    If Film Sound Is Lost 1. Check that the correct format button is glowing on the CP650 front panel and the correct projector (P1 or P2) is selected.

  • Page 26: If Switching To Bypass Does Not Restore Sound

    1. Press the Format 05 front-panel button to play the film in analog Dolby SR format. 2. If the noises persist, switch the CP650 to bypass by pressing the front-panel power button. 3. If the noises still persist, check the power amplifiers, as it is unlikely that the digital and analog parts of the system have both failed.

  • Page 31: Appendix A How To Identify Sound Tracks On Prints

    CP650 User’s Manual Appendix A How to Identify Sound Tracks on Prints Edge of film Dolby Digital soundtrack Analog soundtrack Picture area A Dolby Digital film print or 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 33: Appendix B Advanced Operations

    Press the left menu button multiple times to step through the menus to About this CP650. Note: you can also press and hold the left menu button while rotating the front-panel fader knob clockwise to step through the menu items.

  • Page 34: Display Information About This Cp650 Unit

    Display Information About This CP650 Unit The last menu items provide information about the hardware and software installed in your CP650 unit. This information is useful when discussing problems to your service engineer. Press the left menu button multiple times to step through the menus to About this CP650.

  • Page 35: Appendix C Test And Demonstration Films

    This film 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. This simple procedure must be performed whenever an exciter lamp or LED is replaced, and should also be performed regularly to compensate for the normal aging (and resultant lower sound output on analog soundtracks).
  • Page 36 Cat. No. 1012 Test Films These specialized digital test films are 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.

  • Page 37: Appendix D The Evolution Of Dolby Film Sound

    CP650 User’s Manual Appendix D 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 two decades closely mirrors the history of Dolby film sound technologies.
  • Page 38 CP650 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 39 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...
  • Page 40 The Evolution of Dolby Film Sound The Digital age begins The next film sound development from Dolby Laboratories was Dolby Digital, introduced in 1992. Dolby Digital puts a six-channel digital optical soundtrack in addition to a four-channel SR analog track on 35 mm prints. This format is yet another significant step forward in film sound, providing independent left, center, right, left surround, and right surround channels, plus a sixth channel for bass effects.

  • Page 41: Appendix E Reference Information

    CP650 User’s Manual Appendix E Reference Information List of Cat. Numbers Used Cat. No. 771 Remote Fader Cat. No. 772 Analog I/O and Bypass Circuit Board Cat. No. 773 Dolby Digital Film Decoder Circuit Board Cat. No. 774 System Controller Circuit Board Cat.
  • Page 43 Contrast Adjustment Set the display contrast Scroll up and down the Event Log event listing About this CP650 - Screen 1 • Control software version number • Circuit boards installed Useful for telephone About this CP650 - Screen 2 discussions with your •...

Table of Contents