Dolby Laboratories CP500 Specifications download pdf (Page 79)

7-14

7.13.2 Print Cleanliness

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

The Dolby Digital print format has robust error correction information encoded

along with the audio data, and the CP500 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 Dolby SR track will occur.

Quality

Number of plays

ANALOG

DIGITAL

(Sound & Picture)

Figure 7- 9.

Digital/Analog Track.

7.13.3 Adjustments

Routine adjustments are not required on the digital sub-system under normal use.

Adjustments for 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.

CAUTION

The Cat. No. 700 contains no user serviceable parts. Do not attempt any repairs,

as attempts to do so may cause electric shock. If you feel your Cat. No. 700 is in need of

service, contact your local service engineer.

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Dolby Laboratories CP500 Specifications Page 79