The release time of the dynamic filter is controlled by the Time Vector Processing circuit and
our new patent pending DECIMATOR X technology, which determines the release
characteristics of the input signal and automatically varies the release response of the
dynamic filter.
Low Level Downward Expansion
is performed by use of a voltage controlled amplifier
controlled by a log based audio level detection circuit. A second Time Vector Processing
combined with our new patent pending DECIMATOR X technology circuit, that adaptively
varies the release response over a 1000 to 1 ratio, controls the release response of the
Downward Expander. The release response will be extremely fast, on the order of 2
milliseconds, if the input signal has a fast decaying envelope and upwards of 2 seconds if the
input signal has a slow decaying signal. Downward Expansion takes place when the input
signal level drops below the preset threshold. For example: if the threshold is set for 0db and
input signal of 0db with produce no expansion. As the input signal drops below 0db
downward expansion starts and increases exponentially the farther the input signal drops
below the threshold point. The graph below shows the response of the Expander with a 0db
threshold.
To set up the DECIMATOR for proper operation first determine the reference level of the
system that the DECIMATOR will be connected to. Most professional products operate at
a +4dbu reference level. Music equipment typically operates at
–10dbu. Once the
proper reference level is determined set the reference level switch on both channels
accordingly. (Note: Both Channel One and Two must be engaged.)
SETTING THE DECIMATOR THRESHOLD
THE DECIMATOR
control adjusts both the expander and dynamic filter sensitivity. Start by
setting both the Threshold and Filter Tracking for minimum, full counterclockwise. Push the
FILTER TRACKING switch in and turn the DECIMATOR threshold to the maximum and then
minimum setting. This will set the FILTER TRACKING to a minimum setting while adjusting the
downward expander threshold. Switch the F
ILTER TRACKING switch to the “OUT” position
and turn the Threshold control clockwise until the desired setting of the downward expander is
achieved. This allows adjustment of just the expander operation without the dynamic filter
functioning. The expander should start to operate when there are gaps in the audio or as the
input signal gets close to the noise floor.
NOTE:
Setting this control to high will cause the
expander to start to cut off the instrument signal to soon.
Summary of Contents for HUM EXTRACTOR +DECIMATOR G
Page 1: ...INTRODUCTION...
