


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



NAME
     coch - cochlea model: filterbank and hair cell

SYNOPSIS
     coch (-l lofreq) (-h hifreq) (-w  chanwidth)  (-c|-s  srate)
     (-i item) file

DESCRIPTION
     coch is an SFS compatible implementation of the  APU  gamma-
     tone  filterbank software.  Programmable filterbank based on
     ERB sized filters using  filter  design  of  Roy  Patterson.
     Hair  cell  design  from Ray Meddis.  Original coch takes as
     input a speech waveform and produces one of 1.  filter  out-
     puts, 2. hair cell outputs.

OPTIONS
     -I   Identify program and exit.

     -llofreq
          Select centre frequency  of  lowest  channel.   Default
          50Hz.

     -hhifreq
          Select centre frequency of  highest  channel.   Default
          5000Hz.

     -wchanwidth
          Select width of channels in ERBs.  Default 2 erb.

     -c   Select output of  hair  cell.   Default  is  output  of
          filters.

     -ssrate
          Select output as energy  spectrum  at  specified  frame
          rate. Filter output is rectified, windowed and averaged
          into frames.

INPUT ITEMS
     SP   Any speech item.

OUTPUT ITEMS
     SP   One waveform per filter channel.

     CO   (Optional) Coefficient record of power spectrum.

VERSION/AUTHOR
     1.0 - Mark Huckvale based on software by J.Holdsworth.

SOURCE
     /users/mark/sfs/man/../ucl-priv/coch.src/coch.c





SFS                     Last change: UCL                        1



