Convolution Reverb and Impulse Response

Convolution Reverb

Convolution Reverb

So this may seem a bizarre title unless you have heard a little about it before or found this article through a google search etc… but very simply put Convolution Reverb is the following:

Tracking the reverb of an impulse response in a space and applying the decay and reverb to another audio file to replicate it into a new environment.

Convolution Reverb has lots of benefits such as fitting ADR lines and effects in with production sound recorded on location. I only recently got introduced to the idea of Convolution Reverb as I was in a very noisy location that was due to sound design planning most likely going to be done later in a studio due to the level of control they wanted in post.

To achieve Impulse Responses properly you need:
– Several Balloons
– something sharp
– recording equipment (obviously)

You simply pop the balloon in the space where the dialogue took place and you can get a fairly accurate map of the reverb and decay. This is then put into a convolution processor and can be applied to new effects and dialogue. This is where you get the name Convolution Reverb.

There are 2 other ways to achieve Impulse but I find in the field its easier with a clapperboard. They are:

– Sine wave sweep of the space and calculated together to get an impulse response
– Recording white noise at the source and somewhere else in a space which is again mathematically calculated.

I have not seen the results of Convolution Reverb but have given some to post production and await to see the results.

Hope you now understand Convolution Reverb.

Matt Price

Matt Price

I am a London Based Sound Mixer and Sound Recordist working on Feature Films, Creative Content, Documentaries and Commericials.

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