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SOUNDSHAPER: CDP REFERENCE

MIRROR - invert spectral envelope

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SUMMARY
Invert the spectral envelope frequency-wise, with an option of retaining the original amplitude envelope. 

MODES
 1. Invert spectrum - normal inversion, zeroing inharmonic frequencies.
 2. Retain envelope - retain the original amplitude envelope

PARAMETERS - none
 
NOTES
In a typical (harmonic) instrumental tone, the higher harmonics are weaker than the lower ones. By inverting the spectral envelope, this situation is reversed and the weak higher harmonics gain the amplitude and prominence of the lower ones. The result is a noticeable brightening of the timbre, sometimes verging on distortion. Note that inharmonic frequencies, including those that would make up the noise component in the sound, are removed.  The time-varying spectral evelope also includes the variation of the overall amplitude envelope; Mode 2 retains this original envelope.  

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