Dynamic Processing
193
Parametric Filters
A more complex type of filter is called a parametric filter or Swept EQ. A
parametric filter allows control over three basic parameters of the filter.
The three parameters are:
Frequency, Bandwidth,
and
Boost/Cut.
The
Frequency parameter (Labelled cutoff on the ESI filters) allows you to
select a range of frequencies to be boosted or cut. The Bandwidth
parameter allows you to select the width of the range. (Bandwidth and
Frequency are combined into the Cutoff parameter in ESI's EQ filters.)
The Boost/Cut parameter (Q on the ESI filters) either boosts or cuts the
frequencies within the selected band by a specified amount. Frequencies
not included in the selected band are left unaltered. This is different
from a band pass filter which attenuates (reduces) frequencies outside
the selected band.
The parametric filter is quite flexible. Any range of frequencies can be
either amplified or attenuated. Often times, several parametric sections
are cascaded (placed one after another) in order to create complex filter
response curves.
The Z-Plane Filter
The Z-plane filter can change its function over time. In a simple Z-plane
filter, we start with two complex filter types and interpolate between
them using a single parameter. Refer to the diagram below.
The Z-plane filter has the unique ability to change its function over time.
Frequency
Amplitude
Morph
A Filter
B Filter
Morph
Filters A and B represent two different complex filters. By changing a
single parameter, the Morph, many complex filter parameters can now
be changed simultaneously. Following along the Morph axis you can see
that the filter response smoothly interpolates between the two filters.
This is the essence of the Z-plane filter. Using interpolation, many
complex parameters are condensed down into one manageable entity.
Содержание ESI2000
Страница 4: ...iv ESI Operation Manual...
Страница 10: ...2 ESI Operation Manual...
Страница 26: ...18 ESI Operation Manual...
Страница 28: ...20 ESI Operation Manual...
Страница 36: ...28 ESI Operation Manual...
Страница 64: ...56 ESI Operation Manual...
Страница 100: ...92 ESI Operation Manual...
Страница 102: ...94 ESI Operation Manual...
Страница 114: ...106 ESI Operation Manual...
Страница 166: ...158 ESI Operation Manual...
Страница 168: ...160 ESI Operation Manual...
Страница 194: ...186 ESI Operation Manual...
Страница 196: ...188 ESI Operation Manual...
Страница 220: ...212 ESI Operation Manual...
Страница 222: ...214 ESI Operation Manual...
Страница 270: ...262 ESI Operation Manual...