MIDI

Synthesizer: Filter (2)

The Music Telegraph | Text 2019/06/26 [12:46]
MIDI

Synthesizer: Filter (2)

The Music Telegraph| 입력 : 2019/06/26 [12:46]

▲ 2-Pole Analog Filter

© Waldorf Music

 



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:

1) Low-Pass Filter (LPF)

2) High-Pass Filter (HPF)

3) Band-Pass Filter (BPF)

4) Band-Reject Filter (BRF)

 

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.

 

 

▲ 4 types of slope of filter curve

1) The audio signal above the CutOff frequency is removed.

2) The audio signal below the CutOff frequency is passed as it is.   

© The Music Telegraph

 


The slope of the filter curve depends on the number of poles in the filter circuit:

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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