Audio Apparatus And Method
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Abstract
The invention enables the capture of sound fields with coding and efficient distribution of electrical signals representing the sound fields for subsequent reproduction in a listening environment utilising pairs of non-equidistant apparatus in various defined configurations such that the acoustic distance as well as direction of sound sources is consistently presented with regard to in front of, behind, beside or below from a listening point anywhere in the listening environment and for any listener orientation, thus making the whole listening area a sweet spot and enabling true shared audio experiences, without the need for worn apparatus. New apparatus and methods for capture, distribution and reproduction or render are also disclosed that enable enhanced perception of captured and reproduced sound for shared experiences with both common and individual capture and reproduction apparatus and new communications and control methods and apparatus for multiple users including heightened perception capability and also improved security aspects are also disclosed.
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Citations
274 Claims
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1-164. -164. (canceled)
- 165. An apparatus comprising an arrangement of one or more acousto-electric transducers for receiving and processing of acoustic information at a measuring location at or in the region of the apparatus said apparatus having associated electronic signal processing equipment to produce a set of mutually consistent electrical signals specifically containing a measure of the wave curvature, wave divergence or wave spreading of any direct wave propagating from any acoustic source as observed at the said measuring location in space, said electrical signals being suitable for further processing, combining, separation, storage, transmission or other processing specifically considering preservation or use of said wave curvature, divergence or spreading information either relatively or absolutely, said apparatus being often described as a vector wavefront capture apparatus and said electrical signals often being described as vector wavefront electrical format or vector format by the inventor.
- 188. An sound reproduction apparatus for reproduction of electrical signals as acoustic waves comprising the combination of an electro-acoustic transducer with an active surface referred to variously as a piston, diaphragm or cone in the art and a separate acoustic filter said acoustic filter comprising a gas volume in a cavity formed by the bounding of one side of the cone active surface by said acoustic filter with an aperture being the only means of conveying sound, and of restricted dimensions so as to present a controlled source size in a desired acoustic radiation direction independently of the active surface size thus controlling the polar amplitude and phase radiation pattern of the acoustic energy of the combined electro-acoustic transducer in each or all directions at all frequencies and in particular the highest frequency of interest, said apparatus also serving to increase the acoustic efficiency of the electro-acoustic transducer at certain frequencies and said acoustic filter providing a low pass filter function in the art thus also reducing harmonic distortion products outside the range of frequencies of interest the desired overall frequency response optionally being maintained or modified as desired by an electrical equalisation circuit, said apparatus being useful over a wide range of frequencies including infrasonic and ultrasonic taking into account the low pass filter nature of the apparatus in the dimensions of the apparatus.
- 214. An wave modelling apparatus that considers the wave focussing effect of any partial or fully reflecting boundaries of a building, room, wall, pillar or any other sound influencing structure and so determines the early sound field wave delivery to any point or through any region in space with time according to the rule of centroid moments or rule of centroids of the inventor, so identifying the corresponding pairs of locations for first or early wave convergence, said model be used to alter improve optimise or otherwise change the geometry of the said structure for wave delivery to any point or region in time and space in the listening region by variation of the nature and geometry of the listening area boundaries, and said rule of the method of centroids stating that the first region of reflected wave convergence from a placed source corresponds to resolving the first moment of the source location about the centroid of the influenced gas within the said partially or fully enclosing acoustically reflecting structure
- 220. An electro-acoustic apparatus comprising multiple electro-acoustic transducers with at least one active radiating diaphragm or cone surface, each said apparatus covering the same band of frequencies, said transducers mounted so as to couple the wave from one side of the electro-acoustic transducer active surface to a common chamber by whatever means, wherein a restriction in the form of an orifice is introduced in acoustic proximity to each said active surface thus forming a chamber acoustically towards said active surface with respect to the said common chamber the combination forming a generally low-pass filter in the art so designed as to allow generally unrestricted alternating gas flow in the pass-band of the art towards the common chamber, said orifice then presenting a restriction to alternating gas flow in the art for said alternating gas flow from said active surface towards the, each or all other electro-acoustic transducer active surface accessing the common chamber being suitable for increasing the effectiveness or efficiency of the overall apparatus for the reproduction of sound in the desired pass-band by reduction of cross transducer cone loading for the desired band of frequencies.
- 225. An electro-acoustic apparatus for reproduction of sound without having apparent perceived source direction according to a listener throughout a listening environment including fully, partially or unbounded or open environments and including when said listener is immediately adjacent to said apparatus, said apparatus comprising a set of transmissive half wave resonant structures of differing tuning and supporting large number of resonant harmonic overtones, said resonant structures being so combined as to present some degree of acoustic mismatch for each incident acoustic wave and so behaving as partially reflective whilst also behaving as partially transmissive in allowing part of the said acoustic wave to enter the structure and propagate there-through, and again behaving as partially reflective and partially transmissive in a frequency selective manner at the point of the incident acoustic wave subsequently leaving the apparatus, the overall effect including frequency dependent transmission and reflection components with the said impedance mismatch at the points of entry and exit being augmented by the interacting influence of the adjacent acoustic resonant structure and the rigid boundary parts there associated at the point of entry and exit for the said half wave resonant structure, said structures being in close proximity, and the resonances being related to the apparatus dimensions rather than any incident acoustic wave giving an amplitude and phase behaviour influence unrelated to the source, radiation from An half wave section acting as a source in itself placed at the location of any said half wave resonant section entry and being designed to provide the desired spectral and spatial acoustic energy distribution, and exit points and said half wave resonant structures being so designed as to avoid unwanted resonance behaviours in the desired band of frequencies of operation by suitably small choice of cross section dimension of the said resonant structures, said apparatus also being referred to as the whiteroom loudspeaker by the inventor.
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231. A method of construction of the apparatus of 226 wherein a half wave resonant structure is made of suitable cross-section multi-tubular structure of circular, square, triangular, hexangular or other regular cross-section structure and is fabricated or extruded in the art then shaped and cut to a profile that creates the desired spatial and spectral response, said ends of each resonant structure being either square or non-square cut profile and suitable end correction calculations being made for the resonant frequencies.
- 249. An electrical apparatus comprising amplitude and phase filters controlling spatial transfer function for any location on or with regard to an acoustically opaque object or defined collection of objects each with fixed relative location defined with respect to any impinging acoustic representing a wave qualified with respect to source distance including but not limited to a point source at a distance in a direction or a plane wave representing a source at the acoustic vanishing point in a direction, said filters often being referred to as acoustic object related transfer functions and sometimes abbreviated to ORTF by the inventor, said filters specifically considering distance as described and as qualified by the wave divergence, swelling or curvature as previously described, and said filters able to process signals to provide for or to compensate for said transfer function or elements of both, said collection of objects including the effect of one or more said objects obscuring, blocking or otherwise modifying sound in a particular direction by virtue of its shape or size or placement.
Specification