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noise


Manual Reference Pages  - NOISE (1)

NAME

noise - generate samples of a normally distributed deviate (white noise) in binary shorts or floats.

CONTENTS

Syntax
Description
Options
Copyright

SYNTAX

noise [options]

DESCRIPTION

Generate uniformly distributed numbers in the range [0,1] and then convert these to normally distributed numbers with zero mean and unit variance, using the Box-Muller method described in Numerical Recipes [p203]. The period of the random sequences is claimed to be infinite, [Numerical Recipes, p196]. The random sequence is written to the stdout in binary numbers which are either shorts or floats depending upon the ‘type’ option. The ‘duration’ options sets the duration of the output sequence in samples, converted from time units (s or ms) using the given ‘samplerate’ option.

OPTIONS

1. mean, variance.

Each sample is scaled using the given mean and variance parameters so that samples are drawn from a normal distribution of given mean and variance.

2. seed

When seed=off the system call getpid() is used to supply a new seed each run. Otherwise the seed can be set in order to give the same initialization to generate the same random sequence on different runs.

COPYRIGHT

Copyright (c) Applied Psychology Unit, Medical Research Council, 1995

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.

The MRC makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.

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.


SunOS 5.6 NOISE (1) 1 September 1993
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