NAME

bufwave - a shifting waveform buffer.

CONTENTS

Syntax
Description
Options
Examples
Copyright

bufwave [options] [file]

A buffer (or window) is shifted along the input, and thecontents of the buffer are written to the stdout on each shift.

1. width, frstep.

Input is buffered in frames of size ‘width’ samples, and the buffer isshifted along the input in steps of ‘frstep’ samples.Both ‘width’ and ‘frstep’ may be given with time units (s or ms), in whichcase the they are converted to a number of samples using the given‘samplerate’ option.

2. type.

The ‘type’ option sets the size of a binary sample in bytes.Standard type names are recognised (char, short, int, float, double).For example, type=1 is synonymous with type=char, both specifying abinary sample of 1 byte.

The special case of type=ASCII sets a sample to be a line of ASCII text(delimited by a CR), of size up to a maximum number of characters set bythe ‘length’ option.

3. frame.

The ‘frame’ option selects a sequence of contiguous frames for output by:

              frame=a[-b]

where ‘a’ and ‘b’ are frame numbers: 1,2,3,...The upper limit ‘b’ is optional, and when it is missing then the framesequence is a single frame, otherwise ‘a’ and ‘b’ are inclusive limits.The strings "min" and "max" are recognised as extreme limits.

4. start.

The ‘start’ option is an offset to the start of the first frame in samples.If given with time units, the start is converted to samples using thegiven ‘samplerate’ option.

5. reverse.

The ‘reverse’ option causes each buffer to be written out in reverse orderof its samples.

1. A half-frame overlapping rectangular window of size 10ms.

        bufwave width=10ms frstep=5ms file

2. Reverse the contents of each frame of a given sequence of 75-sample frames.

        bufwave rev=on width=75 frstep=75 file

options edwave

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

Permission to use, copy, modify, and distribute this software without feeis hereby granted for research purposes, provided that this copyrightnotice appears in all copies and in all supporting documentation, and thatthe software is not redistributed for any fee (except for a nominalshipping charge). Anyone wanting to incorporate all or part of thissoftware in a commercial product must obtain a license from the MedicalResearch Council.

The MRC makes no representations about the suitability of thissoftware for any purpose. It is provided "as is" without express orimplied warranty.

THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDINGALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALLTHE A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGESOR 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 THISSOFTWARE.