Resources Contact Us Home
Frequency selective acoustic waveguide damping

Image Number 2 for United States Patent #6278789.

An acoustic waveguide loudspeaker system has an electroacoustical transducer having a vibratile surface. An acoustic waveguide has a first end open and a second end adjacent to the vibratile surface and an effective length corresponding substantially to a quarter wavelength at the lowest frequency of pressure wave energy to be transmitted between the first and second ends. Damping material in the waveguide near the vibratile surface is positioned so as to negligibly attenuate bass frequency energy while of sufficient volume to damp peaks at higher frequencies above the range of the bass frequency energy.

  Recently Added Patents
Method and system for providing cloud based network security services
Compositions of PD-1 antagonists and methods of use
Automatic setup of reflector instances
Cis-alkoxy-substituted spirocyclic 1-H-pyrrolidine-2,4-dione derivatives
Automatic actuator for breakers or switches
Isolated nucleic acid molecule encoding an antibody that reduces GDF-8 activity
  Randomly Featured Patents
Method of actuating a test function of an electrical switching apparatus at a panel and electrical switching apparatus employing the same
Floor mats and method of making same
Fixing device for circuit board
Non-contact damage-free ultrasonic cleaning of implanted or natural structures having moving parts and located in a living body
Identifying when a USB self-powered device is connected to a medical device by triggering an alert about a potential risk to patient
Portable electronic device
Instrument for subretinal implantation
Multiple input/output level interface input receiver
Radiant energy source systems, devices, and methods capturing, controlling, or recycling gas flows
4(2-indolyl)2-amino-pentanedioic acids and cholecyostokinin use thereof