# GNU Radio Record only on Sound

**URL:** <https://www.ruby-forum.com/t/gnu-radio-record-only-on-sound/230949>\
**Category:** GNU Radio\
**Created:** [July 14, 2014, 2:43pm UTC](https://www.ruby-forum.com/t/gnu-radio-record-only-on-sound/230949 "2014-07-14T14:43:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [July 14, 2014, 2:43pm UTC](https://www.ruby-forum.com/t/gnu-radio-record-only-on-sound/230949/1 "2014-07-14T14:43:26Z")

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I will confess to being a complete novice when it comes to GNU Radio but  
I’m in the process of setting up SDR input that I would like to have  
record wav files only when sound above a certain level is detected. Are  
there existing blocks already? Any guidance in this would be  
appreciated.