Sound acquisition method and system, and sound acquisition and reproduction apparatus
AssigneePrescom
InventorFrederic Zurcher
Life of this patent
Estimating the term…
Abstract
Several microphones (M1, M3) are arranged substantially in the same plane (P) and are distributed symmetrically with respect to a direction of symmetry (D) perpendicular to this plane (P). A phase shift is applied between the signals output respectively by different microphones (M1, M3) and the signals thus phase shifted are added, in such a way as substantially to cancel the signals relating to any sound wave arriving in phase and with the same intensity on each of the microphones (M1, M3).
Claims16
A sound acquisition system comprising a number n greater than 2 of sound receiving devices (M1 to M4;
- 100;
- 300;
- 400) arranged, at regular intervals, over a circumference (13) centered with respect to a direction of symmetry (D), and processing means (8) for processing the signals generated from said sound receiving devices, characterized in that the sound receiving devices comprise microphones (M1, M2, M3, M4;
- 100;
- 301;
- 400) arranged in a same plane (P) perpendicular to said direction of symmetry (D), each microphone being arranged in one of a plurality of cavities (12;
- 112) open on one side (23) facing a planar plate (20;
- 510) reflecting sound waves and disposed in parallel to said plane (P) in which said sound receiving devices are arranged.
The system as claimed in 2, wherein each sound reception device comprises a single microphone (M1 to M4;
- 100;
- 300;
- 400).
A sound acquisition and reproduction apparatus, wherein said sound reproduction means comprises at least one loudspeaker (4;
- 504, 505), and wherein said sound acquisition means comprises a number n greater than 2 of sound receiving devices (M1 to M4;
- 100;
- 300;
- 400) and arranged, at regular intervals, over a circumference (13) centered with respect to a direction of symmetry (D), and processing means (8) for processing the signals generated from said sound receiving devices, characterized in that the sound receiving devices comprise microphones (M1, M2, M3, M4;
- 100;
- 301;
- 400) arranged in a same plane (P) perpendicular to said direction of symmetry (D), each microphone being arranged in one of a plurality of cavities (12;
- 112) open on one side (23) facing a planar plate (20;
- 510) reflecting sound waves and disposed in parallel to said plane (P) in which said sound receiving devices are arranged, said sound reproduction means being arranged on the axis of symmetry (D) in such a way that said sound acquisition and reproduction apparatus exhibits a generally symmetric structure about said direction of symmetry (D).
Dependencies are inferred from the claim text.