A-weighting filter (16kHz sampling) for SoX. Filter coefficient was picked up from FaNT (http://dnt.kr.hs-niederrhein.de/indexbd2f.html?option=com_content&view=article&layout=default&id=22&Itemid=15&lang=en)

a_weight_fir_16k.txt

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wav_a_weight.sh

#!/bin/bash

src=$1
dst=${2:-}
if [ -z $dst ]; then
    b=$(basename $src .wav)
    d=$(dirname $src)
    dst="$d/${b}.aw.wav"
fi

echo sox $src $dst fir ~/local/etc/a_weight_fir_16k.txt
sox $src $dst fir ~/local/etc/a_weight_fir_16k.txt