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SOUNDSHAPER: CDP REFERENCE

BLUR - Average the spectral envelope over time


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SPECTRAL > TIME > BLUR >

SUMMARY
Average the spectral amplitude over time. Mode 2 adds a TRACE option to thin the spectrum.
BLUR
blurs amplitude detail over the number of time-windows specified by the windows parameter. It interpolates between the amplitudes in the first and last windows of the group only, and produces a linear scale of values for the windows inbetween. The degree of blurring may be time-varied. Mode 2 adds a TRACE option: to retain only the N loudest channels.

MODES
 1. Blur: time-average the spectral amplitude
 2. Blur and Trace: also thin the spectrum by retaining only the loudest channels (trace parameter).

PARAMETERS
 windows The number of time-windows over which to blur: interpolate amplitude from 1st to last of group
Range: 1-no. of windows;  T-V
Soundshaper shows the max. value possible, which is equivalent to the file-length.
 trace Number of spectral components (channels), in order of loudness, to retain in each analysis window.
Range: 1-no. of channels;   T-V
The maximum value depends on PVOC analysis settings.

NOTES
BLUR may be compared with AVERAGE, which averages the amplitudes frequency-wise across a number of adjacent channels, thus spreading the spectral peaks. BLUR averages over time, so that the rhythmic and dynamic changes over time are blurred. (When done to a instrumental passsage, notes may be lost.)

BLUR is an effective way of altering the quality of a sound, particularly in conjunction with other processes, such as TIMESTRETCH. Various BLURs of different degrees of blurring may be mixed together to create an evolving sound. The
process softens the attack transients, so is effective with plucked or percussive sounds. By time-varying the value for windows from low to high, you can transform the sound from the original to a very blurred effect.

© Ensemble Software and Composers Desktop Project 2012