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Title: Quadriphonic sound pick-up and reproduction devices
Claims: What I claim is: 1. 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. 2. A multiphonic sound transmission system, using a sound pick-up device in accordance with claim 1, in which the sound pick-up signals from the four microphones are reproduced respectively by two pairs of electro-acoustic playback units disposed in the front hemisphere of a reception space and at unequal distances from the axis of said space, the two playback units nearer the axis of said reception space respectively reproducing the sound picked-up by the microphones of said first pair and the two playback units further away from said axis respectively reproducing the sound picked-up by the microphones of said second pair. 3. A multiphonic sound transmission system according to claim 1, using a third pair of microphones which are more distant from the sonic scene than said second pair, in which the spacing between the microphones of said third pair is substantially greater than that between the microphones of the second pair, and in which the sounds picked-up by the microphones of said third pair are respectively reproduced by two additional playback units disposed one on either side of the playback units corresponding to said second pair of microphones. Other info: Inventors: Condamines, Roland J. (Chatillon-sous-Bagneux, FR) Application Number: 545831 Filing Date: 1975-01-31 Publication_date: 1976-02-24 Assignee: Etablissement Public, Telediffusion de France (Paris, FR) Primary Class(es): 381/19 369/89, 381/26 Other Classes: US Patent Ref:
Other Refs:
IRE Transactions on Audio, Enhanced Stereo, by Benson, May-June 1961, pp. 63- 65. | |