Dynamic Filters; What Is A Filter - E-Mu ProteusX Operation Manual

Dynamic Filters

Following is a block diagram of the signal path.
Samples
The Proteus X utilizes advanced Z-plane filters which can dramatically alter the sound of
a sample.
To understand how a filter works, we need to understand what makes a sound wave. A
sine wave is the simplest form of sound wave. Any waveform except a sine wave can be
analyzed as a mixture of sine waves.
One way to represent complex waveforms is to use a chart with frequency on one axis
and amplitude on the other. Each vertical line of the chart represents one sine wave at a
specific amplitude and frequency.
100
Frequency vs Amplitude
80
60
40
20
40 80

What is a Filter?

Most samples are complex waves containing many sine waves of various amplitudes and
frequencies. A filter is a device which allows us to remove certain components of a
sound depending on its frequency. For example, a Low Pass Filter lets the low frequencies
pass and removes only the high frequencies.
E-MU Systems
Z-Plane
Filter
Freq. Q
160 360 720 1440 2880
Frequency
Amp
Vol Pan
...
9 - Synthesizer Basics
Dynamic Filters
L
R
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