Recording voice prompts with Audacity and SOX Ref: http://www.bfrigon.com/custom_voice_prompts/

soxConverter.sh

#!/bin/sh
 
mkdir -p alaw
mkdir -p ulaw
mkdir -p gsm
mkdir -p wav
mkdir -p sln16
mkdir -p g722
 
 
for file in *.raw; do
    file_out=`basename "${file%.*}"`
    
    echo "converting $file_out..."
    
    cp $file sln16/$file_out.sln16
    sox -t raw -r 16k -e signed-integer -b 16 -c 1 $file -t raw -r 8k -e a-law -c 1 alaw/$file_out.alaw
    sox -t raw -r 16k -e signed-integer -b 16 -c 1 $file -t raw -r 8k -e u-law -c 1 ulaw/$file_out.ulaw
    sox -t raw -r 16k -e signed-integer -b 16 -c 1 $file -t gsm -r 8k -c 1 gsm/$file_out.gsm
    sox -t raw -r 16k -e signed-integer -b 16 -c 1 $file -t wav -r 8k -c 1 wav/$file_out.wav
    g722_encode $file g722/$file_out.g722
done
 
echo '---------------------------------------------------'
echo 'Done!'