US4436966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conference microphone unit
Assignee: TELECONFERENCING TECHNOLOGIES Inc A DE CORP
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Filing: 1982-03-15
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Granted: 1984-03-13
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Expires: 2002-03-15
Abstract
Abstract A microphone unit particularly suitable for conference applications is provided, wherein an acousto-electric transducer is disposed between two dish-like back-to-back sound collectors, each having a central aperture exposing one side of the transducer, which preferably has a single planar diaphragm.
Inventors
- 👤 Radamis Botros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:17
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/406; H04R1/34; H04R1/342
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A microphone unit comprising a bidirectional acousto-electric transducer of the cosine-response type disposed in proximity to, and between, two dish-like back-to-back sound collectors each having an aperture therein exposing one of two active, opposite surfaces of said acousto-electric transducer, whereby said microphone unit exhibits substantially rotational symmetry around a central axis of bidirectionality.
Claim 2
Dependent Claim
53 words
A microphone unit comprising a bidirectional acousto-electric transducer of the cosine-response type disposed in proximity to, and between, two dish-like back-to-back sound collectors each having an aperture therein exposing one of two active, opposite surfaces of said acousto-electric transducer, whereby said microphone unit exhibits substantially rotational symmetry around a central axis of bidirectionality.
Claim 3
Dependent Claim
34 words
The microphone unit of claim 1, each of said two opposite surfaces of said acousto-electric transducer being within a therewith substantially coextensive aperture in the respective one of said two dish-like back-to-back sound collectors.
Claim 4
Dependent Claim
33 words
Two microphone units as claimed in claim 1, or 2, one having its axis of bidirectionality perpendicular to that of the other, and both having a common null-axis in the third spatial dimension.
Claim 5
Dependent Claim
15 words
The microphone unit of claim 1, or 2, said acousto-electric transducer being an electret microphone.
Claim 6
Dependent Claim
60 words
Two microphone units as claimed in claim 1, or 2, one having its axis of bidirectionality perpendicular to that of the other, and both having a common null-axis in the third spatial dimension, and the acousto-electric transducer in each of said two microphone units being an electret microphone having a single planar diaphragm perpendicular to the central axis of bidirectionality.
Claim 7
Dependent Claim
25 words
The microphone unit of claim 1 or 2, in combination with an electro-acoustic transducer disposed to substantially symmetrically intersect a null-plane of said microphone unit.
Claim 8
Dependent Claim
60 words
Two microphone units as claimed in claim 1 or 2, one having its axis of bidirectionality perpendicular to that of the other, and both having a common null-axis in the third spatial dimension, said common null-axis being the intersection of two null-planes of said two microphone units, in combination with an electro-acoustic transducer disposed substantially symmetrically along said common null-axis.
Claim 9
Dependent Claim
41 words
The microphone unit of claim 1 or 2, in combination with an electro-acoustic transducer disposed to substantially symmetrically intersect a null-plane, and said acousto-electric transducer being an electret microphone having a single planar diaphragm perpendicular to said central axis of bidirectionality.
Claim 10
Dependent Claim
80 words
Two microphone units as claimed in claim 1 or 2, one having its axis of bidirectionality perpendicular to that of the other, and both having a common null-axis in the third spatial dimension, said common null-axis being the intersection of two null-planes of said two microphone units, in combination with an electro-acoustic transducer disposed substantially symmetrically along said common null-axis, and the acousto-electric transducer being an electret microphone having a single planar diaphragm perpendicular to said central axis of bidirectionality.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |