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SOUNDSHAPER: CDP REFERENCE

FOCUS - focus spectral energy around formants


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SUMMARY
Create a set of filters around the most prominent spectral peaks (formants). 
The program uses filtering to emphasize the most prominent spectral peaks found across a given time-window. 


MODES
 1. Frequency-based extraction of spectral envelope
 2. Pitch-based extraction of spectral envelope

PARAMETERS
 channels - Mode 1:  No. of frequency channels per point used to extract spectral contour (fewer more accurate)
Range: 1-100
 bands - Mode 2: No. of pitch bands per octave used to extract spectral contour (greater more accurate)
Range:  1-12
 peaks   No. of peaks to search for within the time-window, e.g. 6 would emphasize the 6 most prominent peaks
Range:  1-16 (Soundshaper default: 6)
 bandwidth: Bandwidth of peak-centred filters, in Octaves
Range:  0.084 to 10.0 (octaves); default 1
 [bot freq]   Lower limit of frequency range used to search for peaks
Range:  20-20000  T-V
 [top freq]   Upperlimit of frequency range used to search for peaks 
Range: 20-20000  T-V
 [windows]  Number of windows over which to average search for peaks. Attempts to retain only peaks which are stable over time.
N.B. This is a moving time-window, not a fixed time-range.
Range: 2-no. of windows in file; default 9

NOTES
The process is analagous to Exaggerate (narrowing peaks) and the output is rather similar. Key parameters are peaks, bandwidth and windows, then bot/top freq if you want to concentrate on a particular frequency band.

© Ensemble Software and Composers Desktop Project 2014