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