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UPMAX® Upmixing
Auto-Detect Controls
When the Input Format is set to Auto-Detect, the LA-5300 continuously monitors the input signal to determine its
format and will automatically switch to Stereo, Stereo + Dialog, or 5.1-channel processing modes.
The level at which the detector circuit determines that the incoming signal is program audio (and not noise
or silence) is set by the Auto-Detect Threshold control (8-5B). The proper setting depends largely on the
quietness (or noisiness) of channels that are not muted but also contain no audio. Set too low, it may cause a false
trigger to upmix; set too high, it may cause a late transition to upmixing. The default value of -70dB should work
well for most situations.
The amount of time in milliseconds a signal must stay above the Auto-Detect threshold before the unit begins
upmixing - or below the threshold to cease upmixing - is determined the Input Switch Transition control
(8-5A). A value of 10ms is a good starting point for most material.
Figure 8-5 – UPMAX Auto-Detect controls
Chapter 8 | 50
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