5815582 : Active plus selective
headset
|
INVENTORS: |
Claybaugh; David,
Germantown, MD
Denenberg; Jeffrey N., Trumbull, MD
Busch; Ralph, Takoma Park, MD
Hohman; John, Towson, MD
|
| ASSIGNEES: |
Noise Cancellation Technologies, Inc.,
Linthicum, MD |
| ISSUED: |
Sep. 29, 1998 |
|
FILED: |
July 23, 1997 |
| SERIAL NUMBER: |
899090 |
|
MAINT.
STATUS: |
|
| INTL. CLASS (Ed.
6): |
A61F 011/06;
H03B 029/00; |
| U.S. CLASS: |
381/071.6;
381/072; |
| FIELD OF SEARCH: |
381-72,74,103,94.9,155,71.1,71.6,71.11,71.12 ;
181-206 ; 379-406,407,410,412,387,388,390,395
; |
|
ABSTRACT: An active plus selective headset system for
provision of active attenuation of broadband noise as well as
speech filtering comprising a headset with reference microphones,
residual microphones and speakers on each of a pair of open
backed muffs and a controller means.
U.S.
REFERENCES: (No patents reference this one)
| Patent |
Inventor |
|
Title |
|
3952158 |
Kyle et al. |
4 /1976 |
Ear protection and
hearing device |
|
4061875 |
Freifield et al. |
12 /1977 |
Audio processor for
use in high noise environments |
| 4064362 |
Williams |
12 /1977 |
Hearing protector |
| 4654871 |
Chaplin |
3 /1987 |
Method and
apparatus for reducing repetitive noise entering the ear |
| 4677678 |
McCutchen |
6 /1987 |
Active hearing protectors |
| 4953217 |
Twiney et al. |
8 /1990 |
Noise reduction system |
| 5046103 |
Warnaka et al. |
9 /1991 |
Noise reducing system for voice microphones |
| 5091953 |
Tretter |
2 /1992 |
Repetitive phenomena cancellation arrangement with multiple sensors and
actuators |
| 5105377 |
Ziegler, Jr. |
4 /1992 |
Digital virtual earth active cancellation system |
| 5182774 |
Bourk |
1 /1993 |
Noise cancellation headset |
EXEMPLARY
CLAIM(s): Show
all 20 claims
We claim:
1. An active plus selective headset system which provides
active broadband attenuation of noise as well as adaptive speech
filtering, said system comprising:
- a headset means adapted to be worn by a user;
- reference sensing means on said headset means adapted to
sense speech and noise signals;
- speaker means on said headset means adapted to convey speech
signals to a user's ear; and
- controller means adapted to control the speaker means based
on input from the reference sensing means to provide active
broadband attenuation of all random inband noise as well as
adaptive speech filtering so that only the speech reaches the
ear, wherein said active broadband attenuation is accomplished
without synchronization pulses.
RELATED U.S.
APPLICATIONS:
| Patent No. |
Appl No. |
Issue Date |
|
347417 |
|
This application is a continuation, of application Ser. No.
08/347,417, filed Dec. 2, 1994, now abandoned.
FOREIGN
APPLICATION PRIORITY DATA: none
FOREIGN
REFERENCES: none
OTHER
REFERENCES: none
AGENTS:none |