#!/bin/csh
#
# Examples for additive: Masking
#
# parameters are: (1) frequency envelope  (in Hertz)
#                 (2) amplitude envelope [0..1]
#                 (1a) frequency envelope #2 (in Hertz)
#                 (2a) amplitude envelope [0..1]
#                 etc.
#                 (3) output soundfile
# Program input   (a) time of sound in seconds 
#

if ($1 == "") then
   set SOUNDDIR = ../
else
   set SOUNDDIR = $1
endif

if ($2 == "") then
   set BINDIR = ../../bin
else
   set BINDIR = $2
endif


#####
#
# First, create two sinewaves, one of which is masked:
#

echo Creating $SOUNDDIR/masking1.wav which contains two sine tones.

rm -f $SOUNDDIR/masking1.wav
$BINDIR/additive \
    "(0 440; 1 440)" "(0 0.7; 1 0.7)" \
    "g(0 660; 1 880)" "g(0 0.01; 1 0.001)" \
    $SOUNDDIR/masking1.wav >/dev/null <<EOT
4
EOT

#####
#
# Now, create a soundfile with only the masker
#

echo Creating $SOUNDDIR/masking2.wav which contains only one sine tone.

rm -f $SOUNDDIR/masking2.wav
$BINDIR/additive \
    "(0 440; 1 440)" "(0 0.7; 1 0.7)" \
    $SOUNDDIR/masking2.wav >/dev/null <<EOT
4
EOT

#####
#
# masking1.wav sounds identical to masking2.wav to me 
# (at the loudness level I am listening to)
# Here is the sound of the masked tone alone.

echo Creating $SOUNDDIR/maskingDif12.wav which is the difference of
echo "   previous two soundfiles (leaving only the masked tone)."

rm -f $SOUNDDIR/maskingDiff12.wav
$BINDIR/subtract $SOUNDDIR/masking1.wav $SOUNDDIR/masking2.wav \
    $SOUNDDIR/maskingDiff12.wav >/dev/null


#####
#
# Now, create a sound which is not completely masked.
#

echo Creating $SOUNDDIR/masking3.wav which has two tones, one partially masked.

rm -f $SOUNDDIR/masking3.wav
$BINDIR/additive \
    "(0 440; 1 440)" "(0 0.7; 1 0.7)" \
    "g(0 660; 1 880)" "g(0 0.01; 1 0.01)" \
    $SOUNDDIR/masking3.wav >/dev/null <<EOT
4
EOT


#####
#
# Listen to the partially masked tone alone.
#

echo Creating $SOUNDDIR/maskingDiff23.wav which contains only the partially
echo "   masked tone."

rm -f $SOUNDDIR/maskingDiff23.wav
$BINDIR/subtract $SOUNDDIR/masking3.wav $SOUNDDIR/masking2.wav \
    $SOUNDDIR/maskingDiff23.wav  >/dev/null