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 Title: |
US5699437:
Active noise control system using phased-array sensors
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Finn, Alan M.; Amston, CT
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| Assignee: |
United Technologies Corporation, Hartford, CT
other patents from UNITED TECHNOLOGIES CORPORATION (597550) (approx. 5,761)
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| Published / Filed: |
1997-12-16
/ 1995-08-29
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| Application Number: |
US1995000521150
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| IPC Code: |
Advanced:
G10K 11/178;
Core:
G10K 11/00;
IPC-7:
A61F 11/06;
H03B 29/00;
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| ECLA Code: |
G10K11/178E;
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| U.S. Class: |
Current:
381/071.7;
381/071.12;
381/092;
Original:
381/071;
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| Field of Search: |
381/071,94,92
367/901
128/661.01
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| Priority Number: |
| 1995-08-29 |
US1995000521150 |
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| Abstract: |
An active noise control system is provided with a plurality of error sensor arrays 50,77 which provide signals on lines 64-74,90-100 to beam forming and beam steering logic 76 which cause the arrays 50,77 to exhibit acoustic response profiles 104,106, respectively. The profiles 104,106 intersect in a predefined region 116 to be quieted. The logic 76 provides signals on lines 118, one for each region to be quieted, to active noise control (ANC) logic 20 which also receives inputs from feedforward sensing microphones 10 and provides output signals to acoustic speakers 24 which generate anti-noise 26 to cancel the noise in the quiet region 116. The quiet region 116 may be selectively positioned to any region in the room by steering the beams 104,108. Alternatively, the system may have a plurality of distributed sensors which, when taken together, have an overall maximum (main lobe) acoustic response at a predetermined selectable quiet region.
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| Attorney, Agent or Firm: |
DePardo, Gerald L. ;
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| Primary / Asst. Examiners: |
Kuntz, Curtis; Lee, Ping W.
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
EP JP KR
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| Family: |
Show 7 known family members
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First Claim:
Show all 11 claims |
We claim:
1. An active noise control system, comprising:
- sensor means for detecting noise waves and for providing noise signals indicative of said waves;
- beam means for receiving said noise signals, for causing said sensor means to have an acoustic response profile which is selectively responsive to solely a predetermined quiet region remote from said sensor means, and for providing a beam signal indicative of noise at said quiet region; and
- noise control means responsive to said beam signal for providing an anti-noise signal which substantially cancels said noise at said quiet region.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 4 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other Abstract Info: |
DERABS G97-179541
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| Other References: |
International Search Report for PCT/US96/13306, mailed Nov. 27, 1996; for the PCT application that corresponds to United States Application 08/521,150.
Kerem, Samuel, "Dual microphones separate voice from noise." EDN-Electrical Design News, vol. 39, No. 13, Jun. 23, 1994, p. 82.
(1 pages)
Cited by 2 patents
[ISI abstract]
Eriksson, L. J., "Recursive Algorithms for Active Noise Control." International Symposium on Active Control of Sound and Vibration, Apr. 9-11, 1995, Tokyo, Japan, pp. 137-146.
Johnson, Don H. and Dudgeon, Dan E., "Array Signal Processing: Concepts and Techniques", pp. 77-106.
Eriksson, "Development of the filtered-U algorithm for active noise control." J. Acoust. Soc. Am. 89 (1), Jan. 1991, pp. 257-265.
(9 pages)
Cited by 6 patents
[ISI abstract]
Widrow et al., "Adaptive Signal Processing", Ch. 11, Adaptive Control Systems, pp. 288-297.
Takahashi et al., "Self-adapting Multiple Microphone System." Sensors and Actuators, A21-A23 (1990), pp. 610-614.
(5 pages)
Flanagan, J. L. et al., "Computer-steered microphone arrays for sound transduction in large rooms." J. Acoust. Soc. Am., vol. 78, No. 5, Nov. 1985, pp. 1508-1518.
(11 pages)
Cited by 18 patents
Flanagan, J. L. et al., "Autodirective Microphone Systems." Acustica, vol. 73 (1991), pp. 58-71.
(14 pages)
Cited by 6 patents
[ISI abstract]
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