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UPMAX® Upmixing
Advanced UPMAX Menu
The Advanced parameters are included for audio experts who wish to dig deep and tweak settings for very specific
applications or demanding tastes. They are not required for most users and are accordingly not displayed by
default.
Cycles per Octave
The Cycles per Octave control (8-6A) defines the number of teeth there are in one octave of frequency change
of the comb filter. The comb filter is used to separate different frequency components of the input signal to aid in
steering sounds in the surround field.
Minimum Comb Filter Frequency
The lowest frequency of the comb filter is set by the Minimum Comb Filter Frequency control (8-6B). For
most applications, this should be set at or near the same frequency as the Mid-Bass Crossover frequency.
Comb Filter Level
The Comb Filter Level control (8-6C) sets the overall level of the comb filter. This control can have a significant
impact on the movement of audio between the front and rear channels, with higher values rendering a greater
sense of depth. In nearly all cases, leaving this control at its default value will result in the most pleasing soundfield.
Front-Rear Balance Factor
The Front-Rear Balance Factor control (8-6D) determines the amount of upmixed sound pushed to the
surround channels (analogous to the Surround Depth control in previous UPMAX versions).
Center Channel Gain
The Center Channel Gain control (8-6E) sets the gain of signals determined by the upmixer to belong in the
Center Channel, typically dialog.
Rear Channel Downmix Level
In order for a stereo downmix to render at the same level as the original stereo source that was upmixed, the gain
applied to the rear channels must be the inverse of the Dolby Rear Channel Downmix Level. Put another way, if
you want a 3dB boost in the rear channels, the Rear Channel Downmix Level control (8-6F) should be set to -3.
Front-High Crossover
The Front-High Crossover control (8-6G) adjusts the crossover point between the Front Left and Right chan-
nels and the Front Height channels.
Side-Rear Filter Crossover
The Side-Rear Filter Crossover control (8-6H) adjusts the crossover point between the Left and Right Sur-
round channels and the Left and Right Back channels when upmixing to 7.1.
Chapter 8 | 51
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