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

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

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+++ b/man/man1/acf.1	Fri May 20 15:19:45 2011 +0100
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+.TH ACF 1 "15 September 1993"
+
+.SH NAME
+acf \- autocorrelation function of contiguous frames.
+.nf
+i/p and o/p data in binary shorts, (o/p data n/2 points per frame).
+.fi
+
+.SH SYNTAX 
+acf  [arguments]  [file]
+
+
+.SH DESCRIPTION
+The autocorrelation function (acf) is computed using the fft.
+The output framewidth is the given maximum acf lag, which must not be
+greater than the input framewidth.
+Each input frame is padded with zeroes to the next power of 2 larger than
+either the input framewidth, or twice the required max acf lag, (whichever
+is  the larger).
+If necessary, extra padding can be enforced using the (silent) padding option
+to add extra zeroes, padding to a larger power of 2.
+The amount of extra padding is "exponential", expanding the basic size to:
+   
+      ( framesize + padding ) * 2**n
+
+where the padding option is n.
+
+
+(n=0 by default, so that no extra padding is added. When n=1 then padding is
+added to double the size, and when n=2 the size is quadrupled, etc.).
+The input and output frame sizes in sample points may be printed using the
+"size" option.
+
+
+.SH EXAMPLES
+.nf
+1. To print the input and output frame sizes in sample points, 
+   eg for a subsequent plotting program, use the size option:
+
+acf ... size=on
+
+
+2. An acf of a waveform sampled at 10kHz, computed to a max lag 
+   of 12.8ms within a frame of 12.8ms, plotting the 2nd frame in 
+   a sequence of frames with frameshift 12.8ms.
+
+acf samp=10kHz width=12.8ms frstep=12.8ms frame=2 lag=12.8ms file 
+    | x11plot
+
+3. An animated plot of successive acf's of a waveform sampled at 
+   10kHz, each computed within a frame of 12.8ms, and shifted by 
+   2 sample points.
+
+acf samp=10kHz width=12.8ms frstep=2p lag=12.8ms file 
+    | x11play -n128
+
+.fi
+
+.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.
+
+
+
+
+
+