Patent ID: 8050432

Claim:
A sound system comprising: for at least one information channel in at least a frequency range relevant for directivity, at least one pair of exactly two acoustic transducer structures (SA, SB), wherein a first acoustic transducer structure (SA) has a first axis (VA) extending in a maximum directional sensitivity of an uniaxial polar response pattern or being a rotational symmetry axis of a toroidal polar response pattern, a second acoustic transducer structure (SB) having a second axis (VB) extending in a maximum directional sensitivity of a uni-axial polar response pattern or being a rotational symmetry axis of a toroidal polar response pattern, wherein the first and second acoustic transducer structures (SA, SB) have a flat or convex membrane with respect to the wavelengths of transmission, means for directing the acoustic transducer structures (SA, SB) to obtain: an angle of substantially −30 to 30 degrees between a median plane (C 3 ) of a human reference listener (C 2 ) and a line (Z) connecting acoustic centers (AC, BC) of the first acoustic transducer structure (SA) and the second acoustic transducer structure (SB), wherein both the first and the second acoustic transducer structures (SA, SB) are present at a same side of, or on, the median plane (C 3 ), if both the first and the second transducer structures (SA, SB) have either a uni-axial or toroidal polar response pattern, an angle of substantially 70 to 110 degrees between the first axis (VA) and the second axis (VB), and an angle of substantially 70 to 110 degrees between said median plane (C 3 ) and either the first or the second axis (VA, VB), and if the first acoustical transducer structure (SA) has a uni-axial polar response pattern and the second transducer stricture (SB) has a toroidal polar response pattern, an angle of 70 to 110 degrees between the first axis (VA) and a plane perpendicular to the second axis (VB), and an angle between 70 to 110 degrees between said median plane (C 3 ) and either the first axis (VA) or the plane perpendicular to the second axis (VB), wherein a position (P) of the human reference listener (C 2 ) is off-axis with respect to respective main axes and/or planes of maximum directional sensitivity of the first and second acoustic transducer structures (SA, SB), and means for processing (SBT; AMP) electrical signals received from or supplied to the transducer structures (SA, SB), wherein if the transducers structures are loudspeakers (L 1 , L 2 ) the means for directing and the means for processing (AMP) are adapted to obtain substantially phase coherent sound waves at said position (P) for at least said information which is common for said loudspeakers (L 1 , L 2 ).