rotating wave form
Brownsierra (aka Paddy Collins and Pia Gambardella) are a performing duo whose work remains resolutely analogue in a scene where digital is the norm. Like the kinetic works of the fifties and sixties, their sculptural objects are mobile in a way that engages with the physical properties of sound as product of motion in space.
In Rotating Wave Form (motors, speakers, sine tone generator, 2001), a sine wave is sent to four speakers rotating on different axes. In spite of the purity of the generated tone, the pitch audibility shifts, this is a result of the Doppler effect, often experienced with the sirens of emergency vehicles- whereby a sounds pitch alters as it moves closer and further away, a motion which creates an increase (or decrease) in its frequency. This simple principle gives crucial importance to the position of the subject in creating what is heard. It acknowledges sound as something not immutable, but mediated-not by the machines and objects that produce it, but by the listening body that gives, to the motions of air that are sounds, a meaning.
Rob Flint & Lucy Renton. April 2001
4x Retort stands
4x Windscreen wiper motors
4x Slip Rings
4x Slip ring follower arms
1x Sine tone generator
1or 2 Transformers
1x Four way
1x Timer switch
Several metres of speaker wire
Rotating wave forms is a sound installation which utilises the Doppler effect to create a constantly changing acoustic environment from a single
and constant wave form split into four rotating speakers from a single sine tone source.
Rotating Sound wave, 2001, by Brown sierra (Pia Gambardella & Paddy Collins). The sound apparatus is home made with bits of speakers, motors, and control mechanisms, which grind out a monotonous tone, but there is a second reference to motion in the applied movement of the listener, which would modulate the pitch, a sort of Doppler Effect, as with emergency services sirens approaching or diminishing.