diff man/man1/smooth.1 @ 0:5242703e91d3 tip

Initial checkin for AIM92 aimR8.2 (last updated May 1997).

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+++ b/man/man1/smooth.1	Fri May 20 15:19:45 2011 +0100
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+.TH SMOOTH 1 "1 September 1993"
+
+.SH NAME
+smooth  \- Data smoothing by convolution with Gaussian window.
+
+.SH SYNTAX 
+smooth [options] [file]
+
+.SH DESCRIPTION
+Low-pass filter by convolving the input with a unit area Gaussian window
+in the time or frequency domain.
+The transform between domains uses the FFT.
+
+
+.SH OPTIONS
+
+1. length
+
+The amount of input to smooth in time units (ms or s) or samples (no units).
+Time units are converted to samples using the given `samplerate' option.
+The string "max" is recognised as the remainder of input.
+
+2. domain
+
+Select algorithm for smoothing.
+In the time domain ("domain=time") the discrete convolution formula is applied
+directly as a local averaging operation on the input with weights obtained
+by time-reversing and shifting a Gaussian window.
+In the frequency domain ("domain=frequency") the FFT of the whole input is
+multiplied by a Gaussian frequency response function (the FFT of the
+Gaussian window), and the result inverse FFT'd.
+
+3. variance, range
+
+The variance of the Gaussian window and its
+ordinal range in standard deviations either side of the mode.
+The window is assumed to be zero for all time outside the specified range.
+These parameters control the size of the window and consequently the amount
+of smoothing. The larger the variance, the more smoothing.
+The size of the window is given by:
+
+.nf
+	[ 2 * range * sqrt( variance ) ] samples   +  1 sample
+.fi
+
+The variance can be given with time units (ms or s) or samples (no units).
+Time units are converted to samples using the given `samplerate' option.
+
+4. type
+
+The input and output data type. Recognised types are "short" and "float".
+
+.SH "SEE ALSO"
+options gauss filt1 conv
+
+.SH COPYRIGHT
+.LP
+Copyright (c) Applied Psychology Unit, Medical Research Council, 1995
+.LP
+Permission to use, copy, modify, and distribute this software without fee 
+is hereby granted for research purposes, provided that this copyright 
+notice appears in all copies and in all supporting documentation, and that 
+the software is not redistributed for any fee (except for a nominal 
+shipping charge). Anyone wanting to incorporate all or part of this 
+software in a commercial product must obtain a license from the Medical 
+Research Council.
+.LP
+The MRC makes no representations about the suitability of this 
+software for any purpose.  It is provided "as is" without express or 
+implied warranty.
+.LP
+THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 
+THE A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES 
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 
+SOFTWARE.
+