Dolby Laboratories DA20 Manuel d'instructions télécharger pdf (Page 8)

1-3

Indicators

Present

1 perf

10 perf

100 perf

X 10ms

Indicators

Digital Signal Level

Cinema Processor Type Switch

Fixed Delay

Surround Delay

Power Rail

Motor Running

Proj C/O and

Digital Status

Output Signal

+15

Power

- 15

Status

SR D

analog

LS C

RSR

C.P.

Digital Signal Level

+10

-1

-40

+10

-1

-40

+10

-1

-40

+10

-1

-40 -40

-1

+10

-40

-1

+10

digital

proj 1

motor 1

proj 2

motor 2

+ 5

Error Rate Display

7 = CP200

6 = CP45/65/500

5 = CP55

3 = CP200

2 = CP45/65/500

1 = CP55

Auto Digital

Auto Digital Disabled

Auto Digital

Auto Digital Disabled

Figure 1.3 DA20 Front Panel

Error Rate Display

Following powerup, with no film running, the seven-segment display will display a “-”

indicating no data on which to display error rate. When film is run, the display will show

error rate of the film on a scale of 0-8 with intermediate values indicated by the right hand

decimal point (0,0.,1,1.,2,2.,3,3.,4,4.5,5.,6,6.,7,7.,8,) where 0 is the lowest and 8 is the

highest. The display shows “F.” when an uncorrectable block is being processed.

Digital Signal Level Display

Digital audio signal levels are displayed for channels Left, Right, Left Surround, Right

Surround, Center and Subwoofer using four LEDs for each channel. The bottom LED in

each set shows audio activity less than –40dB below Dolby Digital level. Equal brightness

of the center two LEDs indicates “Dolby Digital level”, corresponding to an 85dB SPL in

the theater. The top LED indicates activity greater than +10dB above Dolby level when

lit. These LEDs show that digital audio from a Dolby Digital print is being decoded.

Signal Present Indicators

Signal Present Indicators are active when the signal level is approximately –40dB or

above (with respect to Dolby Digital Level). The LED brightness corresponds directly to

signal level. These Indicators represent the decoded analog signal level present at the

output of the DA20. In a system using a CP200 Cinema Processor, analog audio from the

cinema processor is routed through the DA20 to allow switching between the analog and

the digital tracks. The LEDs indicate the decoded digital signal level when the digital

status Indicators show that a digital track is selected, and the analog signal level when

analog track is indicated (see Digital status below). In a system using other Dolby cinema

processors, audio switching between analog and digital is performed within the Cinema

Processor, and the LEDs will reflect only decoded digital signal level.

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Dolby Laboratories DA20 Manuel d'instructions Page 8

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