“Book ov Convolucions” (DVD)
Book ov Convolucions (DVD)
con·vo·lu·tion (k?n’v?-l??’sh?n)
n.
- A form or part that is folded or coiled.
- One of the convex folds of the surface of the brain.
In mathematics and, in particular, functional analysis, convolution is a mathematical operation on two functions f and g, producing a third function that is typically viewed as a modified version of one of the original functions. Convolution is similar to cross-correlation. It has applications that include statistics, computer vision, image and signal processing, electrical engineering, and differential equations.
In linear acoustics, an echo is the convolution of the original sound with a function representing the various objects that are reflecting it.
In artificial reverberation (digital signal processing, pro audio), convolution is used to map the impulse response of a real room on a digital audio signal. Common ways of generating this impulse include bursting a balloon and firing a starting pistol, though more accurate results can be achieved by recording playback of a sine sweep, which is then ‘deconvolved’.
These short films together form a ‘book of convolutions’, documents and processes that seek to uncover the secrets of familiar spaces. Many of the sounds in this piece are made from site-specific recordings which have been convolved with the captured reverberations of these spaces, ambience convolved with itself, everyday sounds take on the shape of a handrail, a creaking door, other voices. I am standing in a room, similar to the one you are in now..
