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  1. PO
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    <p><a href="http://sox.sourceforge.net/" rel="nofollow noreferrer" title="SoX">SoX</a> is the Swiss Army knife of sound processing. You can utilize it to analyze recordings. The only shortcoming of the folowing solutions is:</p> <ol> <li>You need to split up the recordings to fixed size chunks</li> <li>You can lose recording time (due to killing/analyzing/restarting of recordings) </li> </ol> <p>So further improvements could be doing analyzing asynchronous, although this will complicate the job.</p> <pre><code>#!/bin/bash record_interval=5 noise_threshold=3 storage_folder=~/recordings exec 2&gt;/dev/null # no default error output while true; do rec out.wav &amp; sleep $record_interval kill -KILL %1 max_level="$(sox out.wav -n stats -s 16 2&gt;&amp;1|awk '/^Max\ level/ {print int($3)}')" if [ $max_level -gt $noise_threshold ];then mv out.wav ${storage_folder}/recording-$(date +%FT%T).wav; else rm out.wav fi done </code></pre> <p><strong>Update:</strong></p> <p>The following solution uses a fifo as output from rec. By using split on this pipe to get the chunks, there should be no loss of recording time:</p> <pre><code>#!/bin/bash noise_threshold=3 storage_folder=~/recordings raw_folder=~/recordings/tmp split_folder=~/recordings/split sox_raw_options="-t raw -r 48k -e signed -b 16" split_size=1048576 # 1M mkdir -p ${raw_folder} ${split_folder} test -a ${raw_folder}/in.raw || mkfifo ${raw_folder}/in.raw # start recording and spliting in background rec ${sox_raw_options} - &gt;${raw_folder}/in.raw 2&gt;/dev/null &amp; split -b ${split_size} - &lt;${raw_folder}/in.raw ${split_folder}/piece &amp; while true; do # check each finished raw file for raw in $(find ${split_folder} -size ${split_size}c);do max_level="$(sox $sox_raw_options ${raw} -n stats -s 16 2&gt;&amp;1|awk '/^Max\ level/ {print int($3)}')" if [ $max_level -gt $noise_threshold ];then sox ${sox_raw_options} ${raw} ${storage_folder}/recording-$(date +%FT%T).wav; fi rm ${raw} done sleep 1 done1 </code></pre>
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    1. USJürgen Hötzel
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    1. CO+1 for awesome solution, but those shortcommings are fatal... It won't work for something like an telephone message recording system?
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