5375174 : Remote siren headset
INVENTORS: Denenberg; Jeffrey N., Trumbull, CT
ASSIGNEES: Noise Cancellation Technologies, Inc., Linthicum, MD
ISSUED: Dec. 20, 1994   FILED: July 28, 1993
SERIAL NUMBER: 098143   MAINT. STATUS:
INTL. CLASS (Ed.  5): G10K 11/16;
U.S. CLASS: 381-071
FIELD OF SEARCH: 381-25,71,74,72 ;
AGENTS: Hiney; James W.;

ABSTRACT:   A wireless remote active noise canceling headset including residual microphones (35, 34) mounted on the headset (30) with speakers (32, 33) located adjacent to the residual microphones and an algorithm driven synchronous controller to operate said headset.

U.S. REFERENCES:   3 patents reference this one
Patent No. Inventor Issued Title
4654871 Chaplin et al. 3 /1987 Method and apparatus for reducing repetitive noise entering the ear
4845751 Schwab 7 /1989 Wireless stereo headphone
4878188 Ziegler, Jr. 10 /1989 Selective active cancellation system for repetitive phenomena

EXEMPLARY CLAIM(s): Show all 8 claims

I claim:
  • 1. A wireless remote active noise canceling headset system, said system comprising
    • a headset means,
    • at least one residual microphone means and a first transmission means mounted on said headset means,
    • at least one speaker means mounted on said headset means,
    • a first receiving means, said speaker means operatively connected thereto,
    • a synchronous controller means having a second receiving means and a second transmitting means,
    • said headset means including a first circuit with filter means, an analog to digital converter means and multiplexing means all adapted to process the signal from said microphone means to a form transmittable by said first transmitting means as a noise signal,
    • said controller means having a time division demultiplexer means, a digital signal processor means and a time division multiplexer means to process the signal transmitted by said first transmitting means and received by said second receiving means whereby said noise signal is adjusted and an inverse of said signal is generated by said second transmitting means to said first receiving means to be emitted as sound by said speaker means to cancel undesirable noise adjacent said microphone means.

RELATED U.S. APPLICATIONS: none

FOREIGN APPLICATION PRIORITY DATA: none
FOREIGN REFERENCES: none

OTHER REFERENCES:

  • M. S. Roden, "Digital Communication Systems Design," Sections 5.6-5.9, 12.1 (1988).
  • Product Description "Bestlan", A Wireless LAN Interface for PCs.
PRIMARY/ASSISTANT EXAMINERS: Isen; Forester W.;
ADDED TO DATABASE: Aug. 23, 1996