Dolby Laboratories DP570 - Manual (Page 14)

2 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Overview Principles of Operation
level, Pro Logic decoding, and the other functions controlled by metadata and experienced
by consumers. The DP570’s convenient and user‐friendly interface simplifies multichannel
audio production and mastering.
Figure 1‐1 shows the audio path of the DP570 broken into major functional blocks. Features
that control the operation of a block are connected to it by a dotted line.
Digital audio input on the DP570 is via four female BNC connectors, allowing a total of
eight channels. The emulator section of the DP570, like the DP571, requires the input
channel assignment to conform to a fixed SMPTE 320M definition based upon the program
configuration selected. Since previously recorded material may arrive in formats that do
not match the chosen program configuration, the DP570 provides the ability to reroute the
input channels to match the expected configuration, allowing other equipment to be sent
the correct channel assignment.
The emulator section provides the bulk of the audio processing, including application of
metadata, downmixing, and Pro Logic decoding. All possible listening options allowed by
consumer decoders are provided in the emulator (from high‐end home theaters to mono
TV sets). Note that the inputs to the emulator section may be multiple, unrelated channels
but the outputs are referred to as speaker channels and represent only the active program
(the program currently being worked on or monitored). Once the input channel
configuration has been set, the selected active program appears in the appropriate speaker
channels irrespective of the programʹs appearance on the input channels, thereby
simplifying installation and integration into existing multichannel monitoring
environments.
The emulator section is followed by the bass management section, which provides the
ability to route low frequencies to the appropriate speaker channels. The output of the bass
management section is sent to the digital audio (emulator) outputs as well as the analog
monitor section (if fitted).