COCH

NAME

coch - cochlea model: filterbank and hair cell

SYNOPSIS

coch (-l lofreq) (-h hifreq) (-w chanwidth) (-c|-s srate|-d 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 'C' software by J Holdsworth. coch takes as input a speech waveform and produces one of 1. filter outputs, 2. hair cell outputs.

OPTIONS

-I Identify program and exit.

-l lofreq Select centre frequency of lowest channel. Default 50Hz.

-h hifreq Select centre frequency of highest channel. Default 5000Hz.

-w chanwidth Select width of channels in ERBs. Default 2 erb.

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

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

-d srate Select output as spectrographic picture at specified frame rate. Filter output is rectified, windowed and averaged into frames and the top 50dB expressed as grey scale.

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.
Fri Jul 09 14:54:38 2004