tomwalters@335: #!/bin/bash
tomwalters@335: # Copyright 2009-2010 Thomas Walters <tom@acousticscale.org>
tomwalters@335: # 
tomwalters@335: # Add pink noise to the CNBH syllables database. The first argument is the
tomwalters@335: # path to the clean .wav files. The second argument is a quoted list of the 
tomwalters@335: # desired SNRs in dB, separated by spaces. Directories are made for each SNR
tomwalters@335: # in the directory above that given in the first argument.
tomwalters@335: set -e
tomwalters@335: set -u
tomwalters@335: 
tomwalters@335: CLEAN_SYLLABLES_DATABASE_PATH=$1
tomwalters@335: SIGNAL_TO_NOISE_RATIOS=$2
tomwalters@335: 
tomwalters@335: # The syllables database is approximately at -9dB re. the max RMS level for a
tomwalters@335: # .wav file.
tomwalters@335: REFERENCE_SIGNAL_LEVEL="-9"
tomwalters@335: SAMPLE_RATE=48000
tomwalters@335: 
tomwalters@335: PREV_DIR=`pwd`
tomwalters@335: cd $CLEAN_SYLLABLES_DATABASE_PATH
tomwalters@335: 
tomwalters@335: for SNR in ${SIGNAL_TO_NOISE_RATIOS}; do
tomwalters@355:   echo "Generating noisy data for SNR ${SNR}dB"
tomwalters@335:   if [ ! -e ../snr_${SNR}dB/.pink_noise_success ]
tomwalters@335:   then
tomwalters@335:     mkdir -p ../snr_${SNR}dB/
tomwalters@335:     VOWELS="a e i o u"
tomwalters@335:     CONSONANTS="b d f g h k l m n p r s t v w x y z"
tomwalters@335:     for v in $VOWELS; do
tomwalters@335:       mkdir ../snr_${SNR}dB/$v$v
tomwalters@335:       for c in $CONSONANTS; do
tomwalters@335:         mkdir ../snr_${SNR}dB/$c$v
tomwalters@335:         mkdir ../snr_${SNR}dB/$v$c
tomwalters@335:       done
tomwalters@335:     done
tomwalters@335:     NOISE_LEVEL=$(( $REFERENCE_SIGNAL_LEVEL - $SNR ))
tomwalters@335:     for file in `find . -iname "*.wav"`; do
tomwalters@335:       # Note: the 0.684 below is the length of each syllable in the database
tomwalters@335:       # in seconds
tomwalters@335:       sox -r ${SAMPLE_RATE} -b 16 -n -t s2 - synth 0.684 pinknoise vol ${NOISE_LEVEL} dB | sox -m -v 0.25 $file -t s2 -r ${SAMPLE_RATE} -c 1 - ../snr_${SNR}dB/${file}
tomwalters@335:     done
tomwalters@335:     touch ../snr_${SNR}dB/.pink_noise_success
tomwalters@335:   fi
tomwalters@335: done
tomwalters@335: cd $PREV_DIR