Octave-transpose spectral components into specified range. Components lower than low freq are transposed up until they lie within the range, while those higher than high freq are likewise transposed down. If transposed information competes for the same (output) channel, the component with the highest amplitude is retained. Because the transpositions are by octave, the resultant sounds are normally timbral variants of the original. OPTION • Fuller spectrum - uses a different algorithm PARAMETERS low freq Lowest frequency of range: lower frequencies are 8ve-transposed up. Range: 5-22050 Hz. T-V
high freq Highest frequency of range: higher frequencies
are
8ve-transposed down.
Range: 5-22050 Hz. T-V
NOTES Try experimenting first with a steady-pitched note. If the fundamental and perhaps a couple of the lower harmonics are transposed up into a band originally occupied by higher harmonics, the resultant sound will proabably retain the original fundamental pitch (caused by the difference tones created among the newly placed partials), but with an altered timbre. With inharmonic tones that do not have a clear fundamental, a FOLD upwards in pitch will still create a sound closely related to the original and not unlike a high-pass filtering. Time-varying low freq and/or high freq with frequency bands of relatively narrow pitch can give an effect like ARPEGGIATE, picking out different (groups of) frequency components in turn.
|