Dolby Laboratories DP564 User Manual

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Dolby Laboratories, Inc. 100 Potrero Avenue, San Francisco, CA 94103-4813 Telephone 415-558-0200 Fax 415-863-1373
Wootton Bassett, Wiltshire SN4 8QJ, England Telephone (44) 1793-842100 Fax (44) 1793-842101 www.dolby.com
Dolby, Pro Logic, and the double-D symbol are registered trademarks of Dolby Laboratories.
© 2003 Dolby Laboratories, Inc. All rights reserved. S03/14685
Mixing with Dolby Pro Logic II Technology
By Jim Hilson
Senior Broadcast Audio Specialist
1 Introduction
Dolby
®
Pro Logic
®
II is the latest matrix surround sound technology from Dolby
Laboratories. It was specifically designed to provide a quality multichannel audio experience
to listeners of two-channel audio delivery mediums. Dolby Pro Logic II is still a matrix
technology and does not sound exactly like the discrete 5.1-channel audio from Dolby
Digital soundtracks, but it does effectively emulate that experience.
Dolby Pro Logic II technology is designed to work with existing stereo signals that were not
surround encoded. There are several listening modes and user controls that allow listeners to
tailor the sound to their liking. Audio soundtracks that are encoded with Dolby Pro Logic II
are backward-compatible with Dolby Surround, stereo, and mono listening modes.
For a complete technical description of how the decoder works, a separate paper available
from Dolby Laboratories, Dolby Surround Pro Logic II Decoder: Principles of Operation by
Roger Dressler, explains the decoder and its various modes.
2 Setup
Those who are familiar with mixing in Dolby Surround will have no problem adapting to
Dolby Pro Logic II, as the same considerations for mixing are required.
Monitoring requires proper speaker setup and use of a decoder. The Dolby Model DP564
Multichannel Audio Decoder handles all of the necessary monitoring functions, bass
management, and downmixing. Figure 1 shows a typical setup.
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Summary of Contents

Page 1 - 2 Setup

Dolby Laboratories, Inc. 100 Potrero Avenue, San Francisco, CA 94103-4813 Telephone 415-558-0200 Fax 415-863-1373 Wootton Bassett, Wiltshire SN4

Page 2 - for 5.1-channel speaker

10 4 Common Pitfalls Although you may like a surround effect that spins your head, and it may be just what your production needs, repeating the move

Page 3 - 3 Mixing Issues

2 Figure 1 Audio Flow for Surround Mixing Speaker placement for Dolby Pro Logic II mixing is the same as it is for Dolby Surround, as shown in Figur

Page 4 - 3.1 Upmixing

3 Figure 3 Vertical Placement of Speakers System calibration should be performed after setting up all of the bass management and delay settings in t

Page 5

4 Figure 4 Phantom Center Images with Listener Off-Center (left) and in Sweet Spot (right) If this signal is processed through a Dolby Pro Logic o

Page 6 - 3.3 Interior Effects

5 A common reason for upmixing is to deliver a “5.1” mix to the end user, which usually activates a light on the consumer’s decoder, letting the cons

Page 7 - 3.6 Magic Surround

6 3.2 Announcers and Dialogue Traditionally, dialogue is placed only in the Center speaker to tie the on-screen sounds to the picture. When a Center

Page 8 - 3.8 Surround Pumping

7 3.5 Stacking Encoded Tracks In the film industry, it is common to premix elements for the final mix. This can be done in the opening sequence for

Page 9

8 Often, when producing motion picture sound effects, the sound effects designer removes all ambient sounds briefly so that another sound may be hear

Page 10 - 5 Conclusion

9 3.11 Mono to Stereo Synthesizers Mono to stereo synthesizers can create all sorts of havoc in a Dolby Surround mix. First, the Dolby Surround prog

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