Dolby Laboratories CP650 User Manual download pdf (Page 10)

Dolby

CP650 Digital Cinema Processor User’s Manual Operating Instructions

2-2

2.1.1 Front-Panel Display

Day-to-day operation of the CP650 is performed through interaction with the display

in Figure 2-2.

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

lines display the current format, which in this case is Dolby

Digital Surround EX

with five screen channels active. The bottom left area contains an active bar graph

display of the sound signals present on each channel. The bars move, confirming that

audio is passing through the CP650.

The bars are displayed starting with the Left screen channel, and moving clockwise

around the auditorium: Left screen, Left Extra screen, Center screen, Right Extra

screen, Right screen, Right Surround, Back Surround Right, Back Surround Left, Left

Surround, Subwoofer.

The L on the display indicates that fader control is set to Local, meaning that the

fader knob on the front panel of the CP650 (and any Dolby remote-box fader knob)

controls the sound level in the auditorium. If the display shows an A, an external

auditorium fader knob (not manufactured by Dolby) controls the sound level.

An M1 on the display indicates that, in two-projector installations, the projector 1

motor contact is closed. In single-projector installations the front-panel display will

always show as M1. The motor start signal is used during projector changeovers on

Dolby Digital films in two-projector installations.

The 0 shown on the bottom right is the Dolby Digital film error rate. The first

indication of satisfactory digital soundtrack playback is the detection of a low error

rate. The error rate is a number between 0 and 8. With a correctly aligned digital film

reader, most films will play at an error rate of 6 or lower. If the digital error rate

exceeds 8, or if the display shows F (data not readable) or “–”(no digital soundtrack),

the CP650 automatically switches to playing the film’s analog soundtrack until usable

data appears.

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Dolby Laboratories CP650 User Manual Page 10