VCF.MUS.1

Lesson Summary 

Define the role of the VCF in a synthesizer and describe the historical importance using specific song examples. 

Vocabulary 

Low Pass Filter - A filter that passes low-frequency signals and attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency.

 

 

High Pass Filter - A filter that passes high-frequency signals and attenuates (reduces the amplitude of) signals with frequencies lower than the cutoff frequency.

 

 

Band Pass Filter  - A filter that passes frequencies within a certain range and attenuates (reduces the amplitude of) frequencies outside that range.

 

 

Bandwidth - The difference between upper and lower frequencies.

 

 

 

Cutoff Frequency - The boundary in a filter at which signal begins to be reduced.

 

 

Q Factor - The amplitude and bandwidth of a filter at its cutoff frequency.  

Voltage Controlled Filter (VCF) - An audio filter that allows its cutoff frequency and resonance (Q) to be altered by an external control voltage. A VCF can act as a low-pass, high-pass,  or band-pass filter. 

 

Exercise 

Watch the video below to see Moog engineers discuss the historical importance of the Moog ladder filter.  

 

Listen to the provided audio samples for common musical examples of filtering.  Rusko is one of the breakout English dubstep stars of the mid late 2000's, while Daft Punk are internationally renowned for defining what dance music is in the 21st century. 

Materials 

Jumper Cables

Subject 
Unit