10-222
KDFX Reference
KDFX Algorithm Specifications
959 2 Band Enhancer
2 band spectral modifier
PAUs: 1
The 2 Band Enhancer modifies the spectral content of the input signal primarily by brightening signals
with little or no high frequency content, and boosting pre-existing bass energy. First, the input is non-
destructively split into 2 frequency bands using 6 dB/oct hipass and lopass filters (Figure 1). The hipassed
band is processed to add additional high frequency content by using a nonlinear transfer function in
combination with a high shelving filter. Each band can then be separately delayed to sample accuracy and
mixed back together in varying amounts. One sample of delay is approximately equivalent to 20
microseconds, or 180 degrees of phase shift at 24 khz. Using what we know about psychoacoustics, phase
shifting, or delaying certain frequency bands relative to others can have useful affects without adding any
gain. In this algorithm, delaying the lopassed signal relative to the hipass signal brings out the high
frequency transient of the input signal giving it more definition. Conversely, delaying the hipass signal
relative to the lopass signal brings out the low frequency transient information which can provide punch.
The transfer applied to the hipass signal can be used to generate additional high frequency content when
set to a non-zero value. As the value is scrolled away from 0, harmonic content is added in increasing
amounts to brighten the signal. In addition to adding harmonics, positive values impose a dynamically
compressed quality, while negative values sound dynamically expanded. This type of compression can
bring out frequencies in a particular band even more. The expanding quality is particularly useful when
trying to restore transient information.
Parameters
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In/Out When set to “In” the effect is active; when set to “Out” the effect is bypassed.
Out Gain The overall gain or amplitude at the output of the effect.
CrossOver Adjusts the -6dB crossover point at which the input signal will be divided into the hipass
band and a lopass bands.
Hi Drive Adjusts the gain into the transfer function. The affect of the transfer can be intensified or
reduced by respectively increasing or decreasing this value.
Hi Xfer The intensity of the transfer function.
Hi Shelf F The frequency of where the high shelving filter starts to boost or attenuate.
In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
CrossOver 17 to 25088 Hz
Hi Drive Off, -79.0 to 24.0 dB
Hi Xfer -100 to 100%
Hi Shelf F 16 to 25088 Hz
Hi Shelf G -96 to 24 dB
Hi Delay 0 to 500 samp Lo Delay 0 to 500 samp
Hi Mix Off, -79.0 to 24.0 dB Lo Mix Off, -79.0 to 24.0 dB
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