KDFX Reference
KDFX Algorithm Specifications
10-175
967 Mono -> Stereo
Stereo simulation from a mono input signal
PAUs: 1
Mono -> Stereo is an algorithms which creates a stereo signal from a mono input signal. The algorithm
works by combining a number of band-splitting, panning and delay tricks. The In Select parameter lets
you choose the left or right channel for you mono input, or you may choose to sum the left and right
inputs.
Figure 10-95 Block diagram of Mono -> Stereo effect.
The mono input signal is split into three frequency bands (Low, Mid, and High). The frequencies at which
the bands get split are set with the Crossover parameters. Each band can then be delayed and panned to
some position within your stereo Þeld.
The Þnal step manipulates the sum and difference signals of the pseudo-stereo signal created by
recombining the split frequency bands. The sum of left and right channels represents the mono or center
mix of your stereo signal. The difference of left and right channels contains the part of the signal that
contains stereo spatial information. The Stereo Image algorithm has controls to change the relative
amounts of sum (or center) versus difference signals. By increasing the difference signal, you can broaden
the stereo image. Be warned, though, that too much difference signal will make your stereo image sound
ÒphaseyÓ. With phasey stereo, acoustic images become difÞcult to localize and can sound like they are
coming from all around you or from within your head.
A bass shelf Þlter on the difference signal is also provided. By boosting only the low frequencies of the
difference signal, you can greatly improve your sense of stereo envelopment without destroying your
stereo sound Þeld. Envelopment is the feeling of being surrounded by your acoustic environment.
Localized stereo images still come from between your stereo loudspeakers, but there is an increased sense
of being wrapped in the sound Þeld.
Parameters
Page 1
In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
CenterGain Off, -79.0 to 24.0 dB Diff Gain Off, -79.0 to 24.0 dB
In Select L, R, or (L+R)/2 DiffBassG -79.0 to 24.0 dB
DiffBassF 16 to 25088 Hz
Delay
Delay
Delay
Pan
Pan
Pan
L Input
R Input
L Output
R Output
--
Center Gain
Diff Gain
1/2
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