Invert spectrum around a given frequency. Partials are inverted around a given frequency: if they were originally above the frequency, they appear an equivalent amount below it, and vice versa. PARAMETERS invert Frequency (f) around which to invert the spectrum. It is
assumed
that frequencies originally
below this (f-n) are placed the same amount above it
(f+n), while those
originally above it (f+n) are placed the same amount
below (f-n). [The actual
operation has not been
documented.]
Range:
c.44
(1 chan. bandwidth) - c.20000 Hz.
NOTES Inverting the spectrum will turn high frequencies (such as high harmonics) into low ones and vice versa. You can also expect a harmonic sound to become inharmonic. If a high invert_frequency figure is given, the lowest of the original frequencies may well disappear, being beyond the Nyquist frequency (and our hearing). Equally, if a very low figure is given, high frequency data is inverted too low to be heard (or to be resolved within the channel bandwidth). Soundshaper's data range is therefore more than generous for most purposes, despite being less than the full legal CDP range. As the resultant sound is often a bit "thin", it's worth carrying out a few inversions at different frequencies (e.g. 1k, 2k and 4k) and mixing the result.
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