E-Mu PROTEUS FX Manual de usuario Pagina 112

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7 - Synthesizer Basics
Dynamic Filters
112 Proteus VX Operation Manual
Dynamic Filters
Following is a block diagram of the signal path.
The Proteus VX 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.
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.
Samples
Amp
L
R
Freq. VolQ
Retrigger
Pitch
Glide
Glide
Start Offset
Pan
Z-Plane
Filter
20
40
60
80
100
40 80 160 360 720 1440 2880
Frequency
...
Amplitude
Frequency vs Amplitude
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