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Selenio X100
Installation and Operation Manual
DTS Neural Loudness Control
Figure 4-9. DTS Neural Loudness Control Block Diagram
Overview
The Selenio X100 offers four channels of DTS Neural Loudness Control—a loudness leveling
device that uses advanced psycho-acoustic and signal processing techniques to accurately
detect and regulate the perceived loudness of stereo and 5.1 sources. Using this feature,
you can regulate audio without creating the perception of being "squished" or
compressed.
One of the important aspects of loudness control is frequency compensation, also known as
loudness shaping. Loudness studies dating back to Fletcher /Munson in the 1930s found
that the human ear is more sensitive to different frequencies at different loudness levels.
The Loudness Shaping (Frequency Compensation) parameter preserves the same
perceptual frequency balance as the input signal, while correcting the loudness to match a
desired Target Level.
For example, with Loudness Shaping enabled at a medium level, signals that fall below
the Target Level setting have more gain added to middle frequencies than higher or lower
frequencies. This preserves the original spectral balance. Conversely, signals that fall above
the Target Level setting will have middle frequencies attenuated more than higher or
lower frequencies. Because the Loudness Shaping parameter applies less gain to high and
low frequencies, high or low frequency noise does not become over-emphasized.
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