Linear Acoustic UPMAX User Guide
5
Chapter 1: Introduction
The Linear Acoustic UPMAX produces a 5.1 channel audio signal that is perfect for even-
tual transmission via Dolby Digital (also known as AC-3) to all consumers. The unit ac-
cepts a 2-channel input and “upmixes” it to fill as many of the 5.1 output channels as the
user selects. Any input signal from mono to LtRt (Left Total/Right Total) surround en-
coded audio can be applied to the Main Input and an output will be produced that main-
tains consistency with other 5.1 channel programming.
The UPMAX provides the following features:
•
Advanced upmixing algorithm for stable, convincing surround experience.
•
The only Upmixer fully downmix compatible with Dolby Digital (AC-3).
•
Upmixed surround field is infinitely adjustable.
•
External inputs allow crossfaded bypassing of upmixing to enable discrete 5.1 channel
audio to automatically pass untouched.
•
Built-in independent LoRo/LtRt encoder
•
Relay bypassed digital inputs for “mission critical” broadcast applications.
•
Dual redundant auto-ranging power supplies
1.1
Principles of Operation
The UPMAX
contains two paths for audio signals. The first path contains an upmixer, a
bass extension filter to create the LFE (Low Frequency Effects) or subwoofer channel, and
a simple but powerful set of mix controls to vary each element of the surroundfield. The
second path provides discrete inputs for the Center, LFE, Ls (Left Surround), Rs (Right
Surround), Lf (Left Front) and Rf (Right Front) channels. The upmixed and discrete out-
puts can be crossfaded between to allow smooth transitions between upmixed and discrete
audio.
Please refer to Figure 1-1. It should be noted that this diagram is a general representation
of signal flow. Please consult the appropriate section of this manual for an accurate de-
scription of actual functionality.
Summary of Contents for UPMAX
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