Kurzweil K2661, Musician’S Reference Manual

Page: 215 / 500

KDFX Reference
KDFX Algorithm Specifications
10-133
In the QAlias algorithms, we do not actually sample the incoming signal at a lower rate. Instead
we use a special modulation algorithm to simulate the effect of pitches falling when they should be rising.
The Pitch (coarse and
fi ne) parameters roughly correspond to setting the Nyquist frequency. Higher
pitches result in modulating your input signal with higher frequencies. The LFO Depth parameter changes
the strength of the modulation. Larger values of LFO Depth produce a deeper modulation which may be
considered analogous to inputting a insuf
fi ciently band-limited signal for sampling.
Parameters:
Page 1
Page 2
In/Out When set to In , the quantizer and aliaser are active; when set to Out , the quantizer and
aliaser are bypassed.
Out Gain The overall gain or amplitude at the output of the effect.
DynamRange The digital dynamic range controls signal quantization, or how many bits to remove from
the signal data words. At
0 dB the hottest of signals will toggle between only two bit (or
quantization) levels. Every 6 dB added doubles the number of quantization levels. If the
signal has a lot of headroom (available signal level before digital clipping), then not all
quantization levels will be reached.
Headroom When the signal has a lot of headroom (available signal level before digital clipping),
turning down DynamRange can cause the amplitude of adjacent quantization levels to
exceed the input signal level. This causes the output to get very loud. Set Headroom to
match the amount of digital signal level still available (headroom). This is easily done by
fi nding the DynamRange level at which the signal starts getting louder and matching
Headroom to that value.
dc Offset Adds a positive DC offset to the input signal. By adding DC offset, you can alter the
position where digital zero is with respect to you signal. At low DynamRange settings,
adding DC offset can may the output sputter. dc Offset is expressed in decibels (dB)
relative to full-scale digital.
Alias W/D Amount of aliaser output signal (wet) relative to aliaser input signal (dry) to send to the
fi nal output. The dry signal here is taken to mean the output of the quantizer.
LFO Depth The depth of the modulation, controlling how strong the modulation sounds. Larger
values produce a more extreme modulation effect.
In/Out In or Out Out Gain Off, -79.0 to 24.0 dB
Quant W/D 0 to 100 %wet DynamRange 0 to 144 dB
Alias W/D 0 to 100 %wet dc Offset -79.0 to 0.0 dB
Lowpass 8 to 25088 Hz Headroom 0 to 144 dB
Pitch Crs 8 to 25088 Hz
Pitch Fine -100 to 100 ct
LFO Depth 1 to 49 samp
Pitch C
Pitch F Pitch sets the frequency (coarse and fi ne) at which the input signal is modulated. Higher
pitches produce a high frequency modulation.