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 peaksRange:
1-16
(Soundshaper default: 6)
bandwidth:
Bandwidth of
peak-centred filters, in OctavesRange:
0.084 to 10.0 (octaves); default 1
[bot freq] Lower limit of
frequency
range used to search for peaksRange:
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.
|