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
Image display device and capsule endoscope system
Authorization method for location based services
Providing a multi-tenant knowledge network
Memory with separate read and write paths
Multilevel directory assistance apparatus and method
Methods and apparatus for preserving privacy in an RFID system
Detection of code-based malware
  Randomly Featured Patents
Solid or semi-solid state fermentation of xanthan on potato or potato waste
Removable adhesive sheet or tape
Broadly distributed termination for buses using switched terminator logic
Data flow type information processor with plural output program storing apparatus
Extensible configuration engine system and method
Storage device control unit and method of controlling the same
Amplifier with howling-preventing circuit
Self-Authenticating cryptographic apparatus
.DELTA..sup.1,3,5(10) -Estratrienes
Humanized antibody molecules specific for IL-31