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Initial checkin for AIM92 aimR8.2 (last updated May 1997).
author tomwalters
date Fri, 20 May 2011 15:19:45 +0100
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1 .TH NOISE 1 "1 September 1993"
2
3 .SH NAME
4 noise \- generate samples of a normally distributed deviate (white noise)
5 in binary shorts or floats.
6
7 .SH SYNTAX
8 noise [options]
9
10 .SH DESCRIPTION
11 Generate uniformly distributed numbers in the range [0,1] and then convert
12 these to normally distributed numbers with zero mean
13 and unit variance, using the Box-Muller method described in Numerical
14 Recipes [p203].
15 The period of the random sequences is claimed to be infinite,
16 [Numerical Recipes, p196].
17 The random sequence is written to the stdout in binary numbers which are
18 either shorts or floats depending upon the `type' option.
19 The `duration' options sets the duration of the output sequence in samples,
20 converted from time units (s or ms) using the given `samplerate' option.
21
22 .SH OPTIONS
23
24 1. mean, variance.
25
26 Each sample is scaled using the given mean and variance parameters so that
27 samples are drawn from a normal distribution of given mean and variance.
28
29 2. seed
30
31 When seed=off the system call getpid() is used to supply a new seed each run.
32 Otherwise the seed can be set in order to give the same initialization to
33 generate the same random sequence on different runs.
34
35 .SH COPYRIGHT
36 .LP
37 Copyright (c) Applied Psychology Unit, Medical Research Council, 1995
38 .LP
39 Permission to use, copy, modify, and distribute this software without fee
40 is hereby granted for research purposes, provided that this copyright
41 notice appears in all copies and in all supporting documentation, and that
42 the software is not redistributed for any fee (except for a nominal
43 shipping charge). Anyone wanting to incorporate all or part of this
44 software in a commercial product must obtain a license from the Medical
45 Research Council.
46 .LP
47 The MRC makes no representations about the suitability of this
48 software for any purpose. It is provided "as is" without express or
49 implied warranty.
50 .LP
51 THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
52 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
53 THE A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES
54 OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
55 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
56 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
57 SOFTWARE.
58