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1 .TH COSINE 1 "1 September 1993"
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2
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3 .SH NAME
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4 cosine \- generate a cosine window.
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5
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6 .SH SYNTAX
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7 cosine [options]
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8
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9 .SH DESCRIPTION
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10 Generate a cosine window on the stdout in binary shorts or floats for
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11 a given size.
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12
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13 .SH OPTIONS
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14
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15 1. size
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16
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17 The size of the window can be given with time units (ms or s) or samples (no
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18 units). Time units are converted to samples using the given
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19 `samplerate' option.
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20
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21 2. Hamming
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22
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23 The default ("Hamming=off") is a Hann or raised cosine window:
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24
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25 .nf
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26 w[n] = 0.5 [ 1 - cos( TWOPI . n/(N-1) ) ]
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27 .fi
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28
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29 The "Hamming=on" window is:
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30
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31 .nf
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32 w[n] = 0.54 - 0.46 cos( TWOPI . n/(N-1) )
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33 .fi
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34
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35 Both windows are defined for 0 <= n <= N-1 and are assumed to be zero otherwise.
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36
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37 3. scale
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38
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39 A scale factor for the output.
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40
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41 4. type
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42
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43 Output datatype ("type=short" or "type=float").
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44
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45 .SH "SEE ALSO"
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46 options gauss
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47
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48 .SH COPYRIGHT
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49 .LP
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50 Copyright (c) Applied Psychology Unit, Medical Research Council, 1995
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51 .LP
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52 Permission to use, copy, modify, and distribute this software without fee
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53 is hereby granted for research purposes, provided that this copyright
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54 notice appears in all copies and in all supporting documentation, and that
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55 the software is not redistributed for any fee (except for a nominal
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56 shipping charge). Anyone wanting to incorporate all or part of this
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57 software in a commercial product must obtain a license from the Medical
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58 Research Council.
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59 .LP
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60 The MRC makes no representations about the suitability of this
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61 software for any purpose. It is provided "as is" without express or
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62 implied warranty.
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63 .LP
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64 THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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65 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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66 THE A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES
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67 OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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68 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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69 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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70 SOFTWARE.
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71
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