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Gate
Square ONE Dynamics 27
Gate
The gate function on the Square ONE Dynamics not only allows you to minimise or eliminate unwanted low
level noises, but also gives you creative possibilities by providing the tools to artistically restructure the
dynamics of a signal.
Principles of gate operation
The gate closes when the input signal falls below threshold (position 1 in Figure 15 “Gate function”). This
cuts off the output signal altogether until the gate opens again (position 2 in Figure 15 “Gate function”) when
the input signal goes over threshold.
Figure 15: Gate function
You would normally set the gate threshold below the lowest level of the performance so as not to lose any of
the performance but eliminating any of the unwanted hum, low level noise etc.
Creative use
The human ear is connected to an extremely sophisticated organ for processing incoming audio information:
the brain. Even in situations where there are many sound sources we seem to be able to
tune in on the
sounds we want to hear and reject others. This is sometimes known as the cocktail party effect , where it is
possible to pick out one person’s voice - even at a distance - from may conflicting conversations.
The microphone is less selective in its pick up, being sensitive to all sounds within its range and coverage
angle. For example, a microphone set to pick up the snare drum of a drum kit will pick up every other drum
and cymbal to some extent, and probably the bass guitarist as well. When several microphones are
positioned on the kit, each one giving a good sound on its own particular drum, they will all pick up unwanted
instruments as well, making the sound less clear.
Input signal
Time
Sign
al lev
el
Output signal
Time
Sign
al lev
el
Signals in
this range
muted
Signals in
this range
muted
Signals in
this range
muted
Music signal
Threshold
Noise
1
2