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NeuronVS.book Seite 72 Mittwoch, 27. Oktober 2004 9:28 09
72
Neuron VS modules
High-pass filter
For the record, the
high-pass filter is the
inverted twin of the
low-pass filter. It
allows
frequencies
above
the
cutoff
frequency to pass.
Cutting
low
frequencies makes the
signal sound brighter and thinner - our ear perceives
it to be more strident, with greater presence. In
Neuron, there is a high-pass with a quality of 6 dB –
it can be found in the Filter dropdown menu (press
the Filter type button).
Band-pass
A band-pass filter’s
characteristic
curve
resembles the shape of a
bell.
Its
working
frequency is a center
band, meaning that it
allows frequencies in a
narrow range below and
above this frequency to
pass, cutting all others
outside this frequency
band. Though a band-pass filter actually works with
a center frequency rather than a cutoff frequency, the
term "cutoff" is common usage.
The filtering action of a band-pass with a very high
quality - that is, an extremely steep slope - works on
specified narrow frequency bands. Just a very narrow
spectrum is allowed to pass, and setting a high
resonance parameter can boost it. A band-pass’s
sound-shaping properties are much like that of an
acoustic instrument’s body (or housing). Typically,
the housing emphasizes specific frequencies
regardless of the pitch of the played note. This is
property is decisive in determining the tone of an
acoustic
instrument.
These
environmental
resonances are called "formants" because they form
the characteristic sound of the instrument. A bandpass filter with high quality and high resonance is
called a formant filter. It is an outstanding tool for
emulating acoustic instruments (for example,
strings) and the human voice.
The Neuron band-pass can also be found in the Filter
dropdown menu (Filter Type silver button).