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48

Dolby

®

CP750 Digital Cinema Processor Manual

Aligning the Auditorium

Figure

6

‐

3

Figure 6-3

Channel Tune Tab Showing the Center Channel

6.5.2

Subwoofer Levels

After

the

last

surround

channel

is

adjusted,

click

LFE

to

calibrate

the

subwoofer.

Pink

noise

is

now

present

on

the

subwoofer

channel

only

(140

Hz

bandwidth

for

EQ

and

level

setting

screens).

The

LFE

has

distinct

options

that

appear

on

the

Channel

Tune

tab,

as

shown

in

.

«
...
58
59
60
61
62
...
»

Summary of Contents for CP750

Page 1: ...Dolby CP750 Digital Cinema Processor Manual Issue 5 Part Number 9110270...

Page 2: ...RIGHTS LIMITATION OF LIABILITY IT IS UNDERSTOOD AND AGREED THAT DOLBY LABORATORIES LIABILITY WHETHER IN CONTRACT IN TORT UNDER ANY WARRANTY IN NEGLIGENCE OR OTHERWISE SHALL NOT EXCEED THE COST OF REP...

Page 3: ...these instructions 3 Heed all warnings 4 Follow all instructions 5 Do not use this apparatus near water 6 WARNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or...

Page 4: ...he plug in mains cord rather than a power switch The mains cord must remain readily accessible for disconnecting mains power 22 To avoid exposure to dangerous voltages and to avoid damage to the unit...

Page 5: ...a lettrica o d incendio vanno osservate le seguenti misure di sicurezza o Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto o Assicurarsi che la portata ed il tipo di...

Page 6: ...tended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that maybe of sufficient magnitude to constitute a risk of electric shock to persons Figure ii...

Page 7: ...tor 7 1 3 6 4xAES IN Connector 7 1 3 7 Automation Connector 8 1 3 8 1x AES In Connectors 8 1 3 9 Opt In Connector 8 1 3 10 NonSync Input Connector 8 1 3 11 Aux Out Connectors 8 1 3 12 H I Out Connecto...

Page 8: ...5 Updating the CP750 Firmware 32 Chapter 5 Playing Dolby Surround 7 1 Audio 5 1 Required Software 35 5 2 Cable Connections 35 5 3 Connecting a DSP100 to a CP750 36 5 4 Connecting a DSS200 to a CP750...

Page 9: ...55 7 2 1 Connections 55 7 2 2 Command Syntax 56 7 2 3 Command Set 56 7 3 SNMP 59 Chapter 8 Technical Reference 8 1 CP750 Specifications 61 8 1 1 Audio Inputs 61 8 1 2 Audio Outputs 61 8 1 3 Other Inpu...

Page 10: ...x Dolby CP750 Digital Cinema Processor Manual Table of Contents 8 3 Remote Commands and Control 71 8 3 1 Serial 71 8 3 2 Ethernet 72 Chapter 9 Replacement Parts 73...

Page 11: ...onsync Input Tab 30 Figure 4 8 Mic Input Tab 31 Figure 4 9 Selecting Save in the File Menu 31 Figure 4 10 Selecting Open in the File Menu 32 Figure 4 11 Expert View Window 32 Figure 4 12 Dolby Softwar...

Page 12: ...Table 7 2 Supported MIB 2 MIBS 59 Table 7 3 Other Standard MIBs 59 Table 7 4 V3 MIBS 59 Table 8 1 Rear Panel Connector Descriptions and Types 65 Table 8 2 Backup Power Connector Pinout 66 Table 8 3 S...

Page 13: ...ilt in Ethernet USB and serial interfaces accommodate PC control and cinema network connectivity An independently adjustable global audio delay is assigned to each input to ensure that sound and pictu...

Page 14: ...iguring the CP750 Software Chapter 5 Playing Dolby Surround 7 1 Audio Chapter 6 Aligning the Auditorium Chapter 7 Remote Control and Monitoring Chapter 8 Technical Reference Chapter 9 Replacement Part...

Page 15: ...utton blinks when there are unsaved parameter changes 1 2 2 Front Panel Status Display Day to day operation of the CP750 is performed through interaction with the front panel status display shown in F...

Page 16: ...Main Fader Knob Use this knob to adjust the sound level A fader reading of 7 0 is the nominal correct operating level The main fader knob rotates continuously with no end stops The knob is also used...

Page 17: ...alid Input LEDs Each digital input push button has a green Valid LED located beneath it These LEDs light up when the CP750 detects a valid signal on the respective input whether or not the input is se...

Page 18: ...s labeled 7 and 8 always carry channel pair 7 8 of the 4xAES input If present HI and VI N signals likely use this pair Table 1 2 Analog Input Options Analog Input Rear Panel Input Source Selected Mult...

Page 19: ...provides an interface to a Dolby Digital Cinema network and also ASCII string commands over TCP to port 61408 You can also use this port for setup software and firmware upgrades 1 3 4 RS 232 Serial Po...

Page 20: ...ce with most consumer gear These connectors have floating grounds 1 3 9 Opt In Connector This optical connector is linked to the Digital 4 button It accommodates PCM audio at 96 48 44 1 and 32 kHz 16...

Page 21: ...ol for the desired volume in the auditorium If you use it only for cinema alignment purposes the trimpot will be adjusted using the setup software 1 3 14 Mic Input This input is for use with a balance...

Page 22: ...If you have technical questions about this product technology please contact technical support...

Page 23: ...information over copper conductor links but use different types of conductors and connectors AES EBU uses a balanced connection two conductors plus shield with a characteristic input impedance of 110...

Page 24: ...ecially with long cable runs 2 2 3 Multiple Sources Conversion Between Interface Standards Although some details of the bitstreams used in the AES and S PDIF standards are different the audio informat...

Page 25: ...shielding and termination of cables and cable assemblies are also very important Follow the methods shown in the wiring diagrams 2 4 Connections To connect the CP750 to your auditorium equipment refe...

Page 26: ...ds must be properly wired to an approved mains connector in accordance with the following international code Brown wire live or hot Blue wire neutral Green wire mains ground 2 7 Cable Diagram The cabl...

Page 27: ...nc Source Hearing Impaired System Eight channel Analog Input all unlabeled pins are ground normal operating level 300 mV PA Microphone Input Or Mic multiplexer for setup Screen Speakers Surround Speak...

Page 28: ......

Page 29: ...software on a PC which you can connect to the CP750 with a USB cable 3 1 System Requirements The CP750 setup software runs on Microsoft Windows XP and Windows Vista 3 2 Installing the Software To inst...

Page 30: ...Figure 1 1 is expressly designed for easy connection to laptop computers with a standard A to B cable You can connect directly to the Ethernet connector on the unit rear panel If your laptop supports...

Page 31: ...remote device the system prompts you to enter an IP address You must change TCP IP properties of your laptop to communicate properly with the CP750 when connecting the setup software to a CP750 using...

Page 32: ......

Page 33: ...General Settings Lets you define a power on mode a subwoofer filter frequency and a surround delay for the CP750 Input Settings Lets you define attributes and processing for each input Alignment Lets...

Page 34: ...P750 Digital Cinema System Identifying numbers for your cinema processing equipment Digital Cinema Projector Identifying information for your projector Input Descriptions The identifying text you ente...

Page 35: ...uditorium number in the third triad of the IP Address and Default Gateway fields DHCP We recommend assigning the unit a static IP address and most installations rely on them However the CP750 can supp...

Page 36: ...Configuration and HI VI N Options Mute Duration Figure 4 3 Figure 4 3 General Settings Tab Power On Mode The Power on Mode selects the input that is activated when the CP750 unit is powered on You can...

Page 37: ...Option BSL and BSR Installed Selecting this option enables 7 1 channel support in the CP750 if the auditorium has back surround speakers installed When this option is selected you can choose to Disab...

Page 38: ...e Global Audio Delay field specifies an audio delay in addition to the CP750 decoding delay of approximately 13 ms for 4 AES PCM Use this function to synchronize the audio with the video from digital...

Page 39: ...Ls Rs Sw or L Ls C Rs R Sw To activate your changes click the Apply changes button To cancel your changes click the Discard changes button PCM Decode Mode You can select one of four surround channel...

Page 40: ...ata embedded in the Dolby Digital bitstream The default is Disable 4 1 6 Digital Inputs 2 3 and 4 The options available on these three tabs are identical Figure 4 5 shows the Digital Input 2 tab The t...

Page 41: ...shows the Analog Input tab Figure 4 6 Figure 4 6 Analog Input Tab On this tab you can set Global Audio Delay Mute Main Bsl Bsr Output Pins Fader Preset PCM Channel Assignment PCM Decode Mode These ch...

Page 42: ...th a subwoofer You can also set an Input Trim using the slider Figure 4 7 Figure 4 7 Nonsync Input Tab 4 1 9 Mic Input On the Mic Input tab shown in Figure 4 8 you can choose Global Audio Delay Fader...

Page 43: ...se to the location on your PC where you want to save the file enter a file name and click Save Figure 4 9 Figure 4 9 Selecting Save in the File Menu To modify an existing dlb file and save it under a...

Page 44: ...by double clicking it and typing a new value To return to the tab display reselect Expert View Figure 4 11 Figure 4 11 Expert View Window 4 5 Updating the CP750 Firmware To update the CP750 firmware 1...

Page 45: ...gure 4 12 Dolby Software Update Screen 5 Click Browse to find the dlb update file on your PC then click Open 6 Click Update After a few seconds a progress bar displays the status of the update process...

Page 46: ......

Page 47: ...m does not contain a Dolby cinema server contact the server manufacturer to ensure you have 16 channel playback capability and to obtain the necessary digital audio pinouts of the server Sixteen chann...

Page 48: ...ble Dolby Part Number 8310110 from your Dolby dealer Figure 5 1 Figure 5 1 DSP100 Rear Panel with Cable Connections Table 5 1 DSP100 Output Connector Pinout Pin Description Pin Description 1 AES commo...

Page 49: ...Output of the DSP100 The DSP100 must be reconfigured to allow playback of up to 16 audio channels Once you have verified or installed the necessary firmware proceed as follows Table 5 2 DSS200 Audio...

Page 50: ...for the HI VI N channels You may use aftermarket cables or adapters to fit your installation HI VI N channels may be placed in AES pair 4 channels 7 8 or AES pair 8 channels 15 16 depending on territo...

Page 51: ...put Digital 1 cue at the start of the show which will switch the CP750 into Dolby Surround 7 1 mode followed by a CP750 Decode Mode Discrete cue to switch the CP750 to 5 1 discrete mode for the 5 1 di...

Page 52: ...Digital Input 1 decode mode can also be set manually using the front panel interface Push the menu button on the front panel of the CP750 shown circled in Figure 5 3 to place the unit into editing mo...

Page 53: ...enever Digital Input 1 is selected Figure 5 5 Figure 5 5 Dolby 7 1 Decode Mode 5 15 Serial and Ethernet Table 5 3 lists the string parameters needed for ASCII control over serial or Ethernet Table 5 3...

Page 54: ......

Page 55: ...nel Check for leaks in the low frequency driver cabinet which may sound like rattles Check for loose bolts or other hardware Check the speakers with an ohmmeter If one channel requires markedly more e...

Page 56: ...ceives the most direct energy from the speakers In addition avoid perfect symmetry Arrange the microphones so that they do not form a square or rectangle parallel to the sides of the room Take care no...

Page 57: ...sturb auditorium audio 5 Click Continue in the warning tab that appears to begin the auditorium alignment process The Room Levels tab appears active Room Levels shows a summary of current settings all...

Page 58: ...C under Signal Generator Enable to activate the Center channel 2 Select Pink Noise from the Signal Mode drop down list Pink noise is sent to the Center channel speaker 3 Check the microphone level to...

Page 59: ...el in the auditorium It is not necessary to set exact levels because the levels will change slightly during equalization Exact output level adjustment is performed after equalization 6 5 1 Setting Mai...

Page 60: ...the Center Channel 6 5 2 Subwoofer Levels After the last surround channel is adjusted click LFE to calibrate the subwoofer Pink noise is now present on the subwoofer channel only 140 Hz bandwidth for...

Page 61: ...formed using the RTA built into the CP750 The desired result is a frequency response that closely matches the x curve overlay SMPTE 202M 1998 Results achieved within 3 dB of the x curve are considered...

Page 62: ...s a human operator can avoiding overcompensation in any frequency bands To prevent overcompensation for possible speaker problems the 20 25 30 40 50 and 63 Hz as well as the 12 5 and16 kHz bands are n...

Page 63: ...should be at the same level as the skirts 6 Click to check other Q values for the flattest possible frequency response 6 7 Final Output Level Calibration Once room equalization is complete the sound...

Page 64: ...his check Phase Invert is a temporary setting for this test only 6 8 Final Sound Check Follow these steps to do a final equalization check of the auditorium 1 On the Room Levels tab click Rotate under...

Page 65: ...nit uses the available headroom in the B chain then boosts the overall gain to use all available headroom The analog output level trims are then reduced by the amount of that boost resulting in an opt...

Page 66: ......

Page 67: ...ed input Each of the digital input virtual buttons has an associated virtual LED indicating a valid signal The software also echoes the state of the front panel display and fader Any action available...

Page 68: ...use digital input 2 The system responds with status text verifying that the value has been set cp750 sys input_mode dig_2 Queries consist of a parameter name followed by a space and a question mark cp...

Page 69: ...orm_2 n_a off on cp750 sys dolby_digital_dialnorm_3 n_a off on cp750 sys dolby_digital_dialnorm_4 n_a off on cp750 sys fader 0 to 100 cp750 sys fader_preset_1 0 to 100 cp750 sys fader_preset_1_enable...

Page 70: ..._2 surround_ex cp750 sys pcm_process_mode minimum_latency mute silent_switch cp750 sys pl_surround_delay 20 50 cp750 sys power_on_input analog dig_1 dig_2 dig_3 dig_4 last mic non_sync cp750 sys proce...

Page 71: ...tions RFC 1213 System group RFC 4293 IP MIB scalars ipAddressPrefix table ipAddressTable ipNetToPhysical table ipNetToMedia table ipSystemStatsTable ipIfStatsTable ipDefaultRouterTable ipv4InterfaceTa...

Page 72: ......

Page 73: ...TE 276M Input impedance 75 Digital Input 4 Optical Toslink connector for digital input Multichannel Analog Input Eight channel balanced analog 10 k differential input impedance 300 mV reference level...

Page 74: ...d reference level 100 output impedance RCA connector center weighted sum of Left Center Right 8 1 3 Other Input Output Ethernet Port RJ 45 for network connection and PC setup software Automation Port...

Page 75: ...und Right Surround subwoofer Dolby Surround 7 1 Left Center Right Left Surround Right Surround Back Surround Left Back Surround Right subwoofer Nonsync Left Right Surround subwoofer optional 8 1 5 Oth...

Page 76: ...69 mm Depth behind rack ears including connectors 9 75 in 248 mm Weight 9 4 lb 4 2 kg 8 1 10 PC Connection Ethernet USB port for setup operations and software upgrades 8 1 11 Input Selector Buttons Fo...

Page 77: ...escribed in this section 8 2 1 Backup Power Connector Figure 8 1 Figure 8 2 Figure 8 1 Backup Power Connector Detail Table 8 1 Rear Panel Connector Descriptions and Types Panel Label Description Type...

Page 78: ...ower Connector Pinout XLR Pin Connection 1 15 V input 2 5 V input 3 Ground 4 15 V input 5 shell Ground Table 8 3 Serial Port Pinout Pin Connection 1 No connection 2 Data out TXD 3 Data in RXD 4 Connec...

Page 79: ...AES common 8 No connection 9 AES common 10 No connection 11 No connection 12 AES common 13 No connection 14 CH1 2 15 AES common 16 CH3 4 17 CH5 6 18 AES common 19 CH7 8 20 AES common 21 No connection...

Page 80: ...er 13 Automation Power Output 5 V at a maximum of 50 mA Input 14 ID0 Tally Output Digital 1 LED 15 ID1 Tally Output Digital 2 LED 16 ID2 Tally Output Digital 3 LED 17 ID3 Tally Output Digital 4 LED 18...

Page 81: ...n Table 8 9 The MULTI CHANNEL AUDIO INPUT connector is female pin 1 is at the upper right Table 8 8 Main Audio Output Connector Pinout D Connector Pin Signal Name 1 Chassis 2 L 3 Le 4 Chassis 5 C 6 Re...

Page 82: ...r Manual Technical Reference 10 Ls 11 Rs 12 SW 13 Chassis 14 L 15 Chassis 16 Bsl 17 C 18 Chassis 19 Bsr 20 R 21 Chassis 22 Chassis 23 Ls 24 Rs 25 SW Table 8 9 Multichannel Audio Input Connector Pinout...

Page 83: ...y_e_program 1 4 CP750 sys input_mode dig_1 dig_2 dig_3 dig_4 film CP750 sys ip_setting ip ip ip ip nm nm nm nm gw gw gw gw off on hostname CP750 sys ntp_server hostname ip_address CP750 sys pcm_2_chan...

Page 84: ...mply be typed from a program such as HyperTerminal 8 3 2 Ethernet ASCII character strings can be sent through telnet to set CP750 parameters and obtain current CP750 status information The currently a...

Page 85: ...Table 9 1 Available Replacement Parts Part Number Type Description 8310110 01 CBL 4XAES 7 1 DSP100 CP750 12 12 foot 7 1 audio cable from DSP100 to CP750 8310160 01 CBL 4XAES 7 1 DSS200 CP750 12 12 fo...

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