Resources Contact Us Home
Panel-form loudspeakers

Image Number 4 for United States Patent #6198831.

A panel form loudspeaker/microphone combination has a distributed resonant bending wave member and two transducers mounred on the member at sites where the number of vibrationally active resonance anti-nodes is relatively high. One transducer is capable of vibrating the member to couple to and excite resonant bending wave modes in the member and cause the member to produce an acoustic output. The other transducer also is capable of coupling to he resonant bending wave modes in the member, but it produces an output signal in response to resonance of the member due to incident acoustic energy. The combination may be part of a loudspeaker system including an amplifier for the source signal coupled to the first transducer, and a signal receiver coupled to the second transducer for treating the output signal.

  Recently Added Patents
Fixing apparatus
Image processing apparatus and method configured to calculate defocus amount of designated area
Optical cable plug-in detection
Optical input device
Method and apparatus for establishing a media clip
Technique for manufacturing bit patterned media
Switchgear operating apparatus and three-phase switchgear
  Randomly Featured Patents
Heating method and apparatus
Pogo pin inserting device for testing semiconductor devices and method therefor
Forward link repeater frequency watermarking scheme
Method and apparatus for detecting fractures by ultrasonic echography along the wall of a material or a formation
Printing apparatus and printing method
Concrete stake puller
Donor sheet for heat transfer recording
Number plates for racing vehicles
Method and apparatus for weighing and dispensing objects
Image forming apparatus having paper-dust removing devices