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GP ACOUSTICS (UK) LIMITED

GP ACOUSTICS (UK) LIMITED Patent applications
Patent application number	Title	Published
20120114164	Improvements In Or Relating To Surrounds For Audio Drivers - A ring-shaped surround for a loudspeaker is disclosed, in the form of a membrane formed in a shape that, when relaxed (i.e. when not being driven), has a cross sectional shape with a first portion extending in a radial direction for a first distance, a second portion extending in an axial direction for a second distance, and a third portion extending in a radial direction for a third distance, the first and second portions being connected by a first flexible join, and the second and third portions being connected by a second flexible join, the first join having a first radius of curvature that is shorter than at least one of said first and second distances, the second join having a second radius of curvature that is shorter than at least one of said second and third distances. Thus, the surround has a Z-shape, with a first radially extending portion, and a relatively sharp bend leading to an axially-extending portion. The radially outwardly extending portion can have a surface which undulates around its circumference, to provide a stiffening effect to the otherwise planar surface and inhibit resonances. One or more tabs can be provided, extending from a surface of the second portion, in a direction transverse to the local orientation of the second portion. These will adjust the dynamic properties of the surround as required. Typically, the surround will be circular, to fit around a circular driver. However, other shapes are possible.	05-10-2012
20110192674	Loudspeaker - A loudspeaker comprising a horn waveguide having a throat and a waveguide surface; an acoustic radiator assembly, located at the throat of the waveguide, comprising a diaphragm having a rigid acoustically radiating surface shaped as a section from a toroidal surface for generating acoustic wavefronts, the waveguide surface being adapted to match the shape of the wavefronts coming from the assembly.	08-11-2011
20100061574	AUDIO SYSTEM AND SOUND FIELD CONTROLLER - An audio system comprises three or more loudspeaker units and a source of four or more audio channels, each loudspeaker unit comprising a monopole loudspeaker and a dipole loudspeaker, or a pistonically driven diaphragm loudspeaker and a resonant panel loudspeaker. The system may be arranged such that, for any position relative to a listener at which a loudspeaker unit is situated in use, sounds emitted in response to signals carried by the audio channel for which the designated intended output position corresponds most closely to the position of that loudspeaker unit are emitted from the monopole loudspeaker or pistonically driven diaphragm loudspeaker of that unit. If a loudspeaker unit is not situated approximately at such a position, then sounds emitted in response to signals carried by that channel may instead may be emitted from the dipole loudspeaker or resonant panel loudspeaker of that loudspeaker unit.	03-11-2010