Synthesizer: Filter (2)
The basic function of synthesizer filter is to pass only a specific partial frequency of the input source.
Depending on the function of the filter, the filter is classified into four types:
Before we study the above four types of filter, we need to first look at the basic configuration of the synthesizer filter - It's Slope of Filter Curve, and Resonance.
i) 4 Pole = 24 dB/Octave
ii) 3 Pole = 18 dB/Octave
iii) 2 Pole = 12 dB/Octave
iv) 1 Pole = 6 dB/Octave
Usually, the filter is 4-pole type, but some synthesizers have 2-pole type filters. 'Mini-moog' was the first 4-pole type synthesizer in the market and was loved by the public with a thick and rich sound that passed through its 4-pole filter.
Next, one of the indispensable variables in the synthesizer filter is the resonance. Resonance is often called Emphasis or Q. Resonance increases the amplitude of the frequency band near the Cutoff frequency, which makes the sound of that part louder.
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