Blamsoft VK-1 Viking Manual de usuario descargar pdf (Pagina 8)

Filters

The filter in Viking is actually two filters. These filters are modeled after the classic transistor

ladder filter. In Dual Lowpass mode the filters are in parallel in the left and right output

channels. In HP/LP mode the filters are in series, one highpass and one lowpass. The number of

poles is adjustable from 1 to 4. More poles create a steeper slope and a sharper cutoff.

Resonance

The resonance knob adjusts the gain of positive feedback from the output of the filter to the

input. It creates a peak in the filter response at the cutoff frequency. A narrow bandpass filter is

created at that frequency resulting in a ringing sound.

Cutoff

The cutoff frequency is known by many names. It is often

called the 3dB point, transition point, or knee of the filter. It

is where the pass-band ends and the downward slope

begins. In a lowpass filter the response slopes down at 6 dB

per octave per pole above this frequency. You can consider

frequencies above this frequency to be mostly rejected or

“filtered out” by the filter. And in Viking’s band-pass filter

(HP/LP), the cutoff is at the high end of the pass-band since

it is controlling the lowpass part of the bandpass, see

Spacing for more detail.

Spacing

Spacing is where the two filters come into play. Spacing

adjusts the frequency difference, in octaves, between the

two filters. In Dual Lowpass mode, one filter is heard in the

left channel and the other in the right. Spacing adjusts the

cutoff frequency of the left filter with respect to the right.

In Highpass/Lowpass mode, Spacing also adjusts the

difference in octaves. But in this case the two filters are in

mono, and spacing adjusts the highpass filter with respect

to the lowpass. The highpass filter is one octave below the

lowpass when the knob is fully turned to the right, and

decreases in frequency as the knob is turned to the left. So,

turning the knob to the left widens the pass band.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

Sin comentarios

Blamsoft VK-1 Viking Manual de usuario Pagina 8