Propellerhead Reason - 4.0 Manuel d'opérations télécharger pdf (Page 194)

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SUBTRACTOR SYNTHESIZER

192

D Highpass (HP12)

A highpass filter is the opposite of a lowpass filter, cutting out lower frequencies

and letting high frequencies pass. The HP filter slope has a 12 dB/Octave roll-off.

The darker curve illustrates the roll-off curve of the Highpass Filter. The lighter curve in the middle

represents the filter characteristic when the Resonance parameter is raised.

D Notch

A notch filter (or band reject filter) could be described as the opposite of a band-

pass filter. It cuts off frequencies in a narrow midrange band, letting the frequen-

cies below and above through. On its own, a notch filter doesn’t really alter the

timbre in any dramatic way, simply because most frequencies are let through.

However, by combining a notch filter with a lowpass filter (using Filter 2 - see page

193 in this chapter), more musically useful filter characteristics can be created.

Such a filter combination can produce soft timbres that still sound “clear”. The ef-

fect is especially noticeable with low resonance (see page 193) settings.

The darker curve illustrates the roll-off curve of the Notch Filter. The lighter curve in the middle

represents the filter characteristic when the Resonance parameter is raised.

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Propellerhead Reason - 4.0 Manuel d'opérations Page 194

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