Quadriphonic sound pick-up and reproduction devices
AssigneeEtablissement Public, Telediffusion de France
InventorRoland J. Condamines
Life of this patent
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Abstract
A sound pick-up and reproducing system, comprising a first and a second pair of directional microphones respectively disposed at a first and a second given distance from the sonic scene to be transmitted, said second distance being greater than said first distance, said four microphones being closely coupled; the system is characterized in that the spacing between the microphones of the second pair is substantially less than that between the microphones of the first pair, and in that the angular divergence between the sound pick-up axes of the second pair is substantially less than the angular divergence between the sound pick-up axes of the first pair of microphones.
Claims3
A sound pick-up device for multiphonic broadcasting and recording, comprising a first stereophonic pair of directional microphones disposed at a first given distance from a sonic scene to be transmitted and having a second stereophonic pair of directional microphones disposed at a second given distance from said sonic scene, said second distance being greater than said first distance by a quantity d, each microphone having a sound pick-up axes, the four microphones being disposed so that the spacing l2 between the microphones of the second pair is substantially less than the spacing l1 between the microphones of the first pair, and the angle of divergence .alpha..sub.2 of the sound pick-up axes of the second pair of microphones in the direction of the sonic scene is substantially less than the angle of divergance .alpha..sub.2 of the sound pick-up axes of the first pair of microphones;
- said device being characterized in that each of said pairs of microphones is arranged symmetrically with respect to a median vertical plane of said sonic scene.
Dependencies are inferred from the claim text.