Datasat XD20, Инструкция по установке и эксплуатации

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XD20 Installation and Operating Guide Version 1.1
Document # 9301H264001.1 55
5.3.5. Dolby
®
CP200 Operation
When the XD20 switches to digital, the normal signal paths are interrupted, and DTS signals are inserted
just prior to the Dolby EQ cards, effectively taking over the cinema processor.
Note: For CP200, program the automation optical default format to either “04” A-TYPE
or “05” SR, whichever the film requires.
When the XD20 switches out of digital, the cinema processor is released and reverts to the format
previously selected.
Unless modified, these cinema processors do not have a subwoofer input. In this case, DTS inserts the
subwoofer signal post-fader; the fader or mute will functions not affect the subwoofer level.
Check diagrams for sub connection.
5.4. XD20 Calibration and Setup
This section describes procedures for XD20 audio level adjustment, timecode reader sync adjustment,
sound performance verification, and fail-safe operation verification.
5.4.1. Equipment Requirements
Complete checkout and adjustment of the XD20 unit requires (as a minimum) a multimeter, an SPL
meter, and the DTS Demo film (included in the Technician’s Kit).
Note : The “B-Chain” calibration must be completed prior to adjustment of the XD20.
5.4.2. Setting and Adjusting Audio Output Levels
Channel setup tests and tones are pre-recorded onto the XD20 hard drive.
The audio playback level of the XD20’s built-in 1 kHz test tone has been fixed at 300mV RMS. This
level should match the audio buss level on the cinema processor that the XD20 is connected to. Verify the
buss level by consulting the manufacturer of your cinema processor.
The pink noise tests that are built into the XD20 are used
only to make A-B comparisons to an alternate
sound source, such as magnetic sound track or analog sound.
5.4.2.1. Adjusting Levels
The XD20 contains several built-in audio tests described in Section 7.2.2. They can be accessed through
the following menu path:
Setup
→
Audio
→
Audio Tests . Level adjustment audio tests for SPL
calibration are described in Section 7.2.1, which can be accessed through the following menu path: Setup
→
Audio
→
Level Adjustment .
The Level Adjustment menu provides two choices:
Reference Tone: This will play 1K tone @ 300mV RMS on all channels. The level can be
adjusted b6.4 to -6.2 dB using the up and down arrow buttons.
Pink Noise: The input buss level for most cinema processors is 300mV input, so in
most cases it will be unnecessary to make any adjustments to the XD20
output level. When the level is set at +0.00 dB, the XD20 output is
300mV.
However, if necessary, each channel can be selected and adjusted individually using the arrow navigation
buttons. The up and down arrow buttons will adjust the levels from +6.4 to -6.2 dB. The left and right
arrow buttons will move back and forth among the channels.
When Pink Noise is selected, it will automatically start to play on the first channel (Left). This will be
indicated on the status display screen. The blue Audio LED will also illuminate, indicating that Pink
Noise is playing.
To adjust SPL settings, do the following: