Dolby Laboratories DA20 Manuel d'instructions télécharger pdf (Page 15)

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2.2 Print Cleanliness

As with any soundtrack, keeping the print clean will give best performance. The Dolby

Digital print format has robust error correction information encoded along with the audio

data, and the DA20 uses a powerful digital error correction technique, allowing the data

to be read perfectly even if scratches and dirt are present. However, best performance

will be obtained if the print is kept clean. Standard film cleaners will provide good

results.

The sound quality of the digital track has properties unlike those of an analog track with

regard to print wear. With any analog track, print wear will degrade quality in a more or

less linear fashion; the more wear, the lower the quality of the sound. With a digital

soundtrack, wear will have no audible effect until the picture quality is degraded beyond

use. At this point, wear may exceed the error correction capabilities of the decoder, and

switching to the analog track will occur.

Quality

Number of plays

ANALOG

DIGITAL

(Sound & Picture)

2.3 Adjustments

Routine adjustments are not required on the DA20 under normal use. Adjustments for

cinema processor type, soundhead delay, surround delay, focus, and film path alignment

are made during installation, and should not be attempted by the operator. Small

adjustments may not affect the sound under most circumstances, and no changes will be

heard, but improper adjustment may reduce the safe operating area within which all

errors can be corrected. Proper test equipment is required. Refer to the DA20 Installation

manual for further information.

Caution: There are no user serviceable parts inside the DA20. To avoid electric shock,

do not attempt any repairs. Refer all servicing to qualified personnel.

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Dolby Laboratories DA20 Manuel d'instructions Page 15