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 Title: |
US4712244:
Directional microphone arrangement
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Zwicker, Eberhard; Icking, Germany
Beckenbauer, Thomas; Muenchen, Germany
Beer, Guenther; Erlangen, Germany
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| Assignee: |
Siemens Aktiengesellschaft, Berlin and Munich, Germany
other patents from SIEMENS AKTIENGESELLSCHAFT (512710) (approx. 16,686)
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| Published / Filed: |
1987-12-08
/ 1986-10-14
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| Application Number: |
US1986000918497
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| IPC Code: |
Advanced:
H04R 1/02;
H04R 1/40;
H04R 3/00;
H04R 5/027;
H04R 5/04;
H04R 25/00;
H04R 25/02;
IPC-7:
H04R 1/04;
H04R 1/20;
H04R 25/00;
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| ECLA Code: |
H04R25/40F; T04R225/43;
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| U.S. Class: |
Current:
381/313;
381/092;
381/120;
381/122;
381/327;
Original:
381/068.1;
381/068.5;
381/092;
381/120;
381/122;
381/155;
381/168;
381/187;
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| Field of Search: |
381/68.1,68.5,68,92,120,122,155,168,187
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| Priority Number: |
| 1985-10-16 |
DE1985003536885 |
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| Abstract: |
A directional microphone arrangement has a number of discrete microphones each having an electrical output and elements for deriving first and second electrical signals which are 180 DEG out of phase with respect to each other from the outputs of the microphones. A third signal is also derived through differentiation from one of the microphone outputs which is 90 DEG out of phase with respect to one of the first or second signals. All of the first, second and third signals are added in a summing unit, the output of the summing unit forming the output for the arrangement.
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| Attorney, Agent or Firm: |
Hill, Van Santen, Steadman & Simpson ;
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| Primary / Asst. Examiners: |
Rubinson, Gene Z.; Byrd, Danita R.
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
AT CH DE FR GB IT LI NL SE
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| Family: |
Show 9 known family members
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First Claim:
Show all 25 claims |
We claim as our invention:
1. A directional microphone system comprising:
- a plurality of non-directional microphones each having an electrical output;
- means for deriving first and second electrical signals which are 180° out of phase with respect to each other from respective outputs of said plurality of microphones;
- means for deriving through differentiation a third electrical signal from one of the outputs of said plurality of microphones which is 90° out of phase with respect to one of said first or second signals; and
- means for summing said first, second and third electrical signals thereby forming an output signal for said system.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 52 U.S. patent(s) that reference this one
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