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.TH TOF 1 "Ultrasonics Lab"
.SH NAME
tof - Calculate Time of Flight vs. Threshold Value.
.SH SYNOPSIS
tof
.SH DESCRIPTION
This program computes the Time-of-flight vs threshold
for an ultrasound waveform.
The first 400 points from a waveform are read from the file
.B udata.
The program computes the maximum and then computes
the TOF for each of 256 values of the threshold.
The resulting TOF estimates are placed into the file
.B th.
The threshold values used at each of these points in the
above file are written into the file
.B tt.
The absolute value of the waveform is stored in the
file
.B b.
.PP
This program is especially useful for seeing the effects
of time hop and time warp.
.SH FILES
.TP 8
udata
single precision binary data representing input waveform
.TP
.B th
resulting TOF for 256 values of the threshold
.TP
.B tt
the actual threshold values for the 256 estimates.
.TP
.B b
the absolute value of the original signal.
.SH SEE ALSO
Crawford, Carl, 
"Multipath Artifacts in Ultrasonic Transmission Tomography,"
December 1981.
.SH DIAGNOSTICS
None.
.SH BUGS
There are no error messages if the file is not readable
or if the three output files cannot be created.