US3940560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quadriphonic sound pick-up and reproduction devices
Assignee: Telediffusion de France ets Public de Diffusion
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Filing: 1975-01-31
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Granted: 1976-02-24
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Expires: 1995-01-31
Abstract
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.
Inventors
- 👤 Roland J. Condamines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
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 α 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 α 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.
Claim 2
Dependent Claim
172 words
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 α 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 α 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.
Claim 3
Dependent Claim
99 words
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.
Claim 4
Dependent Claim
87 words
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.
References Cited (Backward Citations)
GB984601A
Cited
US3686471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |