Dolby Laboratories Multichannel Audio Tool DP570 - Manual (Page 50)

34 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features
Example
You set the emulator to Full (no downmix) with no compression (the default for the
Custom selection). You then audition a few authoring presets until you find the
combination that suits the program best. Next, you switch among the emulator presets to
make sure the metadata you have selected works in a variety of downmix settings. Now
you know you have settings that maximize the mixing capabilities for all your potential
listeners.
By using presets, you both save time and increase the accuracy of your checking, since
there are multiple variables in both the authoring and emulator sections.
4.11 Using Lt/Rt Input Mode
The DP570 provides a separate input (Lt/Rt) for a signal encoded in Dolby Surround. When
you activate the Lt/Rt Input mode, the emulator is fed only by the Lt/Rt input, and the
DP570 sends a Pro Logic
® decoded signal to your monitor system. You cannot alter settings
for the signal from the Lt/Rt input, but you can use the input to ensure that an Lt/Rt mix is
performing as expected.
For an example of monitoring a Dolby Surround program while creating metadata for a
5.1‐channel program, see
Using the DP570 in Postproduction on page 51.
4.12 Channel Mapping and Input Routing
Table 4‐3 shows how the DP570 routes input channels to emulator output channels.
Channel mapping changes automatically according to the program configuration, and
reflects how the channels will be connected to a Dolby Digital encoder.
The DP570 input router enables you to reroute input channels to conform to the
automatically assigned channel mapping.
The program number (1–8) identifies the individual programs associated with each
channel. So, the entry 2C/2S means ʺProgram 2, Center channel/Program 2, Surround
channel.ʺ
Caution: Changes to metadata parameters may be made while in Lt/Rt Input mode, but
you cannot hear the effect of these changes, because the emulator is dedicated to
Lt/Rt input signal. Therefore, you should not change metadata values in Lt/Rt
Input mode.
Table 4-3 Input Channel Routings
Program
Configuration 1/2 3/4 5/6 7/8
5.1+2 1L/1R 1C/1LFE 1Ls/1Rs 2L/2R
5.1+2 × 1 1L/1R 1C/1LFE 1Ls/1Rs 2C/3C
4 + 4 1L/1R 1C/1S 2C/2S 2L/2R
4 +2 × 2 1L/1R 1C/1S 3L/3R 2L/2R
4 + 2 + 2 × 1 1L/1R 1C/1S 3C/4C 2L/2R
4 + 4 × 1 1L/1R 1C/1S 4C/5C 2C/3C