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Class Information
Number: 381/64
Name: Electrical audio signal processing systems and devices > Sound effects > Reverberators > Mechanical (e.g., reverberation chamber)
Description: Subject matter where the echoes are produced by other than electrical means.

Sub-classes under this class:

Class Number Class Name Patents
381/65 Helical spring 10

Patents under this class:

Patent Number Title Of Patent Date Issued
8615090 Method and apparatus of generating sound field effect in frequency domain Dec. 24, 2013
8284195 Cooperative utilization of spatial indices between application and rendering hardware Oct. 9, 2012
8275138 Dynamic acoustic rendering Sep. 25, 2012
8139780 Using ray tracing for real time audio synthesis Mar. 20, 2012
8036395 Sound effects generation device, sound effects generation method, and computer program product Oct. 11, 2011
7039478 Method and system for authoring a soundscape for a media application May. 2, 2006
6771787 Waveguide electroacoustical transducing Aug. 3, 2004
6445798 Method of generating three-dimensional sound Sep. 3, 2002
6405093 Signal amplitude control circuitry and methods Jun. 11, 2002
6148175 Audio entertainment system Nov. 14, 2000
5812689 Low-powered loud speaker provided with echo generator Sep. 22, 1998
5539830 Mounting structure for an integral vibration element of a spring type echo machine Jul. 23, 1996
5333203 Reverb and selectable tremolo and vibrato electron tube preamplifier Jul. 26, 1994
5220608 Method and means for stereophonic sound reproduction Jun. 15, 1993
5131051 Method and apparatus for controlling the sound field in auditoriums Jul. 14, 1992
4718098 Multi-diaphragm artificial reverberation device Jan. 5, 1988
4653101 Audio reverberator Mar. 24, 1987
4628528 Pressure wave transducing Dec. 9, 1986
4248120 Stringed musical instrument with electrical feedback Feb. 3, 1981

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