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SOUNDSHAPER: CDP REFERENCE

REMOVE - remove unwanted pitch and harmonics


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SUMMARY
REMOVE subtracts from the signal a given pitch and its harmonics, or (Mode 2) it removes everything but these same frequencies. All pitches between midimin and midimax are removed. The process is intended for cleaning up recordings, but might have some creative uses, too.

MODES
 1. Remove a pitch and its harmonics up to a specified frequency limit.
 2. Remove everything but the specified pitch and its harmonics.


PARAMETERS
  midimin: Lowest pitch to remove
    Range: 1-127 (MIDI)
  midimax: Highest pitch to remove
    Range: 1-127(MIDI)
  rangetop: top frequency to search, for harmonics to be eliminated.
    Range: 10-20 kHz
  atten: Attenuation of suppressed components
    Range: 0 none to 1 max.
 

NOTES
Removing more is not necessarily better as the resulting hole in the spectrum can appear to emphasize the very pitch(band) you wanted to eliminate. The author (Trevor Wishart) writes: "There are lots of complications in removing a pitch from a sound, which the user will discover. If you remove too many harmonics, the hole itself seems to produce the very pitch you were trying to remove! I have no idea why this is. The high frequency limit should therefore be kept as low as possible if you are seriously attempting to remove an existing pitch element from a sound."

Mode 2 might be applied first (then replaced with Mode 1), to check the pitch is actually there as you think.


© Ensemble Software and Composers Desktop Project 2014