Keywords In Basic Operation - Akai MFC42 Operator's Manual

Keywords in basic operation

[Filter]
As the coffee filter, it separates one to pass through
and the other to block. In sound application, the
separation is determined by their signal frequencies.
This particular criterion frequency is called as "cut-off
frequency". There are several filter types of different
characteristics.
Cutoff frequency
Level
Low
<HIGH PASS>
Passes the frequency components higher than the
cut-off frequency and cuts out the lower frequency
components.
Level
Low
<BAND PASS>
Passes the frequency components adjacent to the
cut-off frequency and cuts out the higher and lower
frequency components.
[Cut-off]
The point specified in frequency that determines where the filter effect takes place. The filter separates the
signal, to pass or cut-out, referenced to the cut-off frequency. Changing the cut-off frequency changes the
sound character.
[Resonance]
It accentuates the frequency components near the cut-off frequency to give sound the distinguish
character. It oscillates when it's overdone.
Frequency
High
HIGH PASS
Cutoff frequency
Frequency
High
BAND PASS
Level
Frequency
Low
Frequency response in original
Level
Cutoff frequency
Frequency
Low
LOW PASS
<LOW PASS>
Passes the frequency components lower than the cut-off
frequency and cuts out the higher frequency components.
Level
Cutoff frequency
Frequency
Low
NOTCH
<NOTCH>
Cuts out the frequency components adjacent to the cut-off
frequency and passes through the higher and lower
frequency components.
Note: The CUTOFF knob may not change the sound
character as the depth of filter notch is lessened when
RESONANCE knob is turned up.
Chapter 2 Basic Operation
High
passes through filter ···
High
High
7