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Planet Phatt Operation Manual
46
PROGRAMMING BASICS
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 (Fc on Planet Phatt 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, and the Boost/
Cut parameter (Q on Planet Phatt 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.
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.
Frequency
Amplitude
Morph
A Filter
B Filter
Morph
The Z-plane filter has the unique ability to change its function over time.
Summary of Contents for Planet Phatt
Page 1: ...OPERATION MANUAL E mu Systems Inc Fhlanett Phatt ...
Page 9: ...1 Chapter 1 Basic Setup INTRODUCTION BASIC SETUP ...
Page 10: ...Planet Phatt Operation Manual 2 ...
Page 17: ...Chapter 2 Basic Operation 9 BASIC OPERATION ...
Page 18: ...Planet Phatt Operation Manual 10 BASIC OPERATION ...
Page 27: ...Chapter 3 Master Menu 19 MASTER MENU ...
Page 28: ...Planet Phatt Operation Manual 20 MASTER MENU ...
Page 43: ...Chapter 4 Programming Basics 35 PROGRAMMING BASICS ...
Page 44: ...Planet Phatt Operation Manual 36 PROGRAMMING BASICS ...
Page 63: ...Chapter 5 Edit Menu 55 EDIT MENU ...
Page 64: ...Planet Phatt Operation Manual 56 EDIT MENU ...
Page 88: ...Planet Phatt Operation Manual 80 EDIT MENU ...
Page 89: ...Chapter 6 Step By Step 81 STEP BY STEP ...
Page 90: ...Planet Phatt Operation Manual 82 STEP BY STEP ...
Page 103: ...Chapter 7 Reference Section 95 REFERENCE SECTION ...