Chapter 1: Introduction; Principles Of Operation - Linear Acoustic UPMAX2251 User Manual

5.1-channel surround-field synthesizer

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Linear Acoustic upMAX 2251 User Guide

Chapter 1: Introduction

The Linear Acoustic

for eventual transmission via Dolby Digital (also known as AC-3) to all consumers.

The unit accepts 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 encoded audio can be applied to the Main Input and an output will

be produced that maintains consistency with other 5.1 channel programming.

Further, external discrete sources of audio such as announcer or stereo crowd can be

applied to the unit via its Mix Inputs and can be selectively mixed with the audio pro-

duced by the upmixing process. A subwoofer, or LFE channel can also be selectively

created from the Main Input audio or via the discrete LFE Mix Input.

The

MAX 2251 provides the following features:

• Advanced upmixing algorithm for stable, convincing surround experience.

• Fully compatible with all surround formats including Dolby Digital

• Upmixed surround field is infinitely adjustable in width and depth.

• External inputs allow mixing of discrete audio signals with internal upmix.

• Relay bypassed digital inputs for "mission critical" broadcast applications.

• Built-in adjustable delays to compensate for video path processing.

• Simple front panel user interface and display.

1.1

The

MAX 2251contains two paths for audio signals. The first path contains an up-

mixer, a bass extension filter to create the LFE (Low Frequency Effects) or subwoof-

er 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 outputs are selectively combined to allow for the addition of

specific audio elements to the upmix-derived elements.

Please refer to Figure 1-1. It should be noted that this diagram is a general represen-

tation of signal flow. Please consult the appropriate section of this manual for an ac-

curate description of actual functionality.

MAX 2251 produces a 5.1 channel audio signal that is perfect

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