


DOWN28(SFS1)      MISC. REFERENCE MANUAL PAGES       DOWN28(SFS1)



NAME
     down28 - filter and downsample 20kHz waveforms to 8kHz

SYNOPSIS
     down28 (-i item) (-2) file

DESCRIPTION
     down28 is  a  program  to  filter  and  downsample  a  20kHz
     waveform  to  8kHz. For 20.0kHz waveforms, the IEEE sampling
     rate converter routine is used.  This upsamples to 40kHz and
     applies a FIR low-pass filter at 4kHz before downsampling.

     Options and their meanings are:

     -I         Identify program and version number.

     -iitem     Select input item number.

     -2         Filter and downsample lx waveform.

INPUT ITEMS
     1.xx       Any 20kHz speech waveform.

     2.xx       (Or) Any 20kHz excitation waveform.

OUTPUT ITEMS
     1          Filtered and down-sampled waveform.

     2          (Optional) Filtered and down-sampled waveform.

FILES
     /home/sfs/data/down28.filt
                FIR filter for 20.0kHz waveforms: 1023  tap  low-
                pass at 4kHz for 40kHz sampling.

VERSION/AUTHOR
     1.4 - Colin Ayer

SEE ALSO
     agc, differ

SOURCE
     /users/mark/sfs/man/../ucl/HQ.src/down28.c












Sun Release 4.1          Last change: IC                        1



