List of signals in xwpl/data
----------------------------

Signal		Samples		Description
------------	-----	------------------------------------------------
zero.asc	  256	zero signal
d.asc		  512	a numerical dirac (Kronecker delta)
r.asc		  512	gaussian white noise
sgnr.asc	  512	sign( r.asc )

s.asc		  512	a sine wave
s+r.asc		  512	s.asc + r.asc
s+d.asc		  512	s.asc + d.asc
s+100d.asc	  512	s.asc + 100 * d.asc
sxexpr.asc	  512	s.asc * exp( epsilon * r.asc )

line.asc	  512	a linear function
long.asc	 2048	same, 2048 samples

spike.asc	  256	a spike (not a dirac)
ping.asc	  512	exponentially decaying sine wave

chirp256.asc	  256	a linear chirp (frequency ramp)
linchirp.asc	 1024	a linear chirp (frequency ramp)
quadchrp.asc	 1024	a quadratic chirp
twochrp1.asc	 1024	sum of two linear chirps, different frequency
twochrp2.asc	 1024	the sum of two linear chirps, different phase

caruso.asc	50000	Caruso singing an aria from "Tosca"
car_seg.asc	 4096	a segment of caruso.asc for wimpy machines...

fort.asc	15000	hydrophone (underwater) recording
fort_seg.asc	  512	a 512 sample segment of fort.asc
f+r.asc		  512	fort_seg.asc plus r.asc

transien.asc	  512	"pathological" transients (courtesy Stephane Mallat)

bomb.asc	 8300	discrete levels, (courtesy Vern Paxson)