


ENVELOPE(SFS1)    MISC. REFERENCE MANUAL PAGES     ENVELOPE(SFS1)



NAME
     envelope -  generate  amplitude  envelope  track  of  speech
     waveform

SYNOPSIS
     envelope (-i item) (-w windowsize) (-h) (-d) file

DESCRIPTION
     envelope produces a smoothed amplitude envelope of a  speech
     pressure  waveform as a track item at the same sampling fre-
     quency.  The envelope is  calculated  from  the  sum-squared
     sample  values in a given window.  The window is supplied on
     the command line.  A rectangular window is used by  default,
     but a hamming window is an option.

     Options and their meanings are:

     -I         Identify program and exit.

     -iitem     Select input item number.

     -wwindowsize
                Specify the envelope  window  width  in  seconds.
                Default 1ms.

     -h         Use hamming window.  Default rectangular.

     -d         Output in dB (10log10(envelope)).

INPUT ITEMS
     1.xx       Any speech waveform.

OUTPUT ITEMS
     16         Amplitude envelope.

VERSION/AUTHOR
     1.0 - Mark Huckvale.

SOURCE
     /ptemp/mark/sfs/ucl/envelope.c















Sun Release 4.1         Last change: UCL                        1



