Sampling Spaces (Make your own impulses for convolution reverbs) – Part 1

iPhone microphone - FFT Analysis
iPhone microphone – FFT Analysis

Places with interesting acoustic properties have always been interesting to people around the globe: Cavernous canyons have mystical qualities, old churches can produce heavenly reverbs, and large man made halls can all create larger than life sounds. All of these spaces can be useful to audio engineers, but until fairly recently it was extremely hard to reproduce the exact properties of a particular acoustic space. Can you imagine how useful it would be to “sample” a room’s properties and recreate it anywhere and at anytime? Now, with so many convolution reverbs available to audio engineers, it has never been easier to do! You only need a few things to start creating your own impulse responses! Ahhh, what a great time to be an audio engineer.

I’ve recently decided to start sampling spaces. As a sound designer and musician these will be useful in many ways. For example, I can sample a world class recording studio to give samples a more realistic room sound. Outdoor canyons can give an extra touch of realism to a space. I can also sample a trash can to see what texture that can add to my mixes.  Another use is to sample locations you have recorded in so you can simulate them later for overdubbing or post.  There are a multitude of creative applications for convolution reverbs.  So why is it that none of the audio engineers I know take the time to record their own impulse responses for convolution reverbs?

Over the years i have come to realize that if things aren’t simple and easily accessible they don’t get done. Now re-read that last sentence and really internalize it. To demonstrate this try putting your instrument out in the open for a week and see how often it gets played. Now take the same instrument, put it in it’s case and keep track of how often you play it. I guarantee you play it more when it is readily available.

It is for this reason that I’m making a simple tutorial on how to sample your own acoustic spaces. I will attempt to sample a variety of spaces using a variety of gear; iPhone, portable PA (crate taxi), Microtrack, MBox, Rode NT4 and Studio Projects C4 microphones. These results should tell you what results you can get from these devices. They should also give you all the information you need to make your very own impulse responses!

I will create the steps over a series of posts since otherwise this would be one giant post.  Stay tuned for more soon!

-Aaron

 

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  • svj moving

    This was cool.

  • mepliecispack

    Hi,

    Thanks for this…