Dolby Laboratories DA20 Podręcznik użytkownika - Strona 8

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Error Rate Display
+10
+1
-1
-40
+10
+1
-1
-40
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.
Cinema Processor Type Switch
Fixed Delay
100 perf
10 perf
1 perf
+10
+10
+1
+1
L
LS
C
-1
-1
-40
-40
+10
+10
+1
+1
R
RS
SW
-1
-1
-40
-40
Digital Signal Level
Surround Delay
X 10ms
Digital Signal Level
Indicators
Figure 1.3 DA20 Front Panel
1-3
1 = CP55
2 = CP45/65/500
3 = CP200
5 = CP55
6 = CP45/65/500
7 = CP200
L
C
R
LS
RS
SW
S
SR D
digital
analog
C.P.
Status
proj 1
motor 1
proj 2
motor 2
Power
- 15
+15
+ 5
Auto Digital
Auto Digital
Auto Digital
Auto Digital Disabled
Auto Digital Disabled
Auto Digital Disabled
Output Signal
Present
Indicators
Digital Status
Indicators
Proj C/O and
Motor Running
Indicators
Power Rail
Indicators