Mark Edward Engebretson

US Patent:

7516932, Apr 14, 2009

Filed:

Dec 28, 2006

Appl. No.:

11/648157

Inventors:

Mark Engebretson - Huntington Beach CA, US
Mary Vosse - Culver City CA, US
Harald Kanz - North Hills CA, US
Yoshiyuki Takeuchi - Pine Mountain Club CA, US

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

A47H 1/10

US Classification:

248317, 381 87, 381386

Abstract:

A system is provided for suspending a plurality of line array loudspeakers. The suspension system includes a rigging bar having an engaging member, such as a pivotal member, positioned near one end of the rigging bar. The engaging member includes a free end capable of extending outward past the end of the rigging bar in which the engaging member is positioned. The end of the rigging bar opposite the pivotal member is designed to releasably receive an engaging member of an adjacent rigging bar. The free end of the engaging member of the rigging bar may include a hole that aligns with holes positioned in the receiving end of the rigging bar. The engaging member of one rigging bar may then be secured to an adjacent rigging bar by aligning holes of the engaging member of a first rigging bar with the holes in the receiving end of a second rigging bar and inserting a release pin through the aligned holes.

US Patent:

7606383, Oct 20, 2009

Filed:

Oct 5, 2005

Appl. No.:

11/244677

Inventors:

Mark E. Engebretson - Huntington Beach CA, US
Luis F. Esparza - Chino Hills CA, US

Assignee:

QSC Audio Products, Inc. - Costa Mesa CA

International Classification:

H04R 9/06
H04R 1/20

US Classification:

381335, 381337, 381343, 381345

Abstract:

A loudspeaker system consisting of a plurality of direct-radiating electro-acoustical drivers arrayed along a curved line. While in one embodiment the curved line array may be a spiral array, in another embodiment it may be any curved line array (such as an arcuate array). The acoustical drivers are directly coupled to an acoustical waveguide without use of adapters or a throat section. The waveguide and the acoustical drivers may thus be oriented along the curved line so as to produce controlled vertical and horizontal angular coverage with improved phase coherence and reduced distortion. A plurality of phase plugs may be interspersed between the plurality of acoustical drivers to assist in equalizing the sound path to achieve uniform phase at the mouth of the waveguide.

US Patent:

7606384, Oct 20, 2009

Filed:

Oct 5, 2005

Appl. No.:

11/244679

Inventors:

Mark E. Engebretson - Huntington Beach CA, US
Luis F. Esparza - Chino Hills CA, US

Assignee:

QSC Audio Products, Inc. - Costa Mesa CA

International Classification:

H04R 9/06
H04R 1/20

US Classification:

381335, 381337, 381343, 381345

Abstract:

A loudspeaker system consisting of a plurality of direct-radiating electro-acoustical drivers arrayed along a spiral line. The acoustical drivers may be directly coupled to an acoustical waveguide without use of adapters or a throat section. The waveguide and the acoustical drivers may thus be oriented along the spiral line so as to produce controlled vertical and horizontal angular coverage with improved phase coherence and reduced distortion. A plurality of phase plugs may be interspersed between the plurality of acoustical drivers to assist in equalizing the sound path to achieve uniform phase at the mouth of the waveguide.

US Patent:

7997552, Aug 16, 2011

Filed:

Mar 11, 2009

Appl. No.:

12/402348

Inventors:

Mark Engebretson - Huntington Beach CA, US
Mary Vosse - Culver City CA, US
Harald Kanz - North Hills CA, US
Yoshiyuki Takeuchi - Pine Mountain Club CA, US

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

A47H 1/10

US Classification:

248317, 381386, 381387

Abstract:

A system is provided for suspending a plurality of line array loudspeakers. The suspension system includes a rigging bar having an engaging member, such as a pivotal member, positioned near one end of the rigging bar. The engaging member includes a free end capable of extending outward past the end of the rigging bar in which the engaging member is positioned. The end of the rigging bar opposite the pivotal member is designed to releasably receive an engaging member of an adjacent rigging bar. The free end of the engaging member of the rigging bar may include a hole that aligns with holes positioned in the receiving end of the rigging bar. The engaging member of one rigging bar may then be secured to an adjacent rigging bar by aligning holes of the engaging member of a first rigging bar with the holes in the receiving end of a second rigging bar and inserting a release pin through the aligned holes.

US Patent:

20080085026, Apr 10, 2008

Filed:

Oct 5, 2005

Appl. No.:

11/244676

Inventors:

Mark E. Engebretson - Huntington Beach CA, US
Luis F. Esparza - Chino Hills CA, US

Assignee:

QSC AUDIO PRODUCTS, INC. - Costa Mesa CA

International Classification:

H04R 1/02
H04R 1/20

US Classification:

381338

Abstract:

A loudspeaker system consisting of a plurality of direct-radiating electro-acoustical drivers arrayed along a curved line. While in one embodiment the curved line array may be a spiral array, in another embodiment it may be any curved line array (such as an arcuate array). The acoustical drivers are directly coupled to an acoustical waveguide without use of adapters or a throat section. The waveguide and the acoustical drivers may thus be oriented along the curved line so as to produce controlled vertical and horizontal angular coverage with improved phase coherence and reduced distortion. A plurality of phase plugs may be interspersed between the plurality of acoustical drivers to assist in equalizing the sound path to achieve uniform phase at the mouth of the waveguide.

US Patent:

42563895, Mar 17, 1981

Filed:

Dec 31, 1979

Appl. No.:

6/108180

Inventors:

Mark E. Engebretson - Warner Springs CA

Assignee:

Paramount Sound Systems Corporation - Glendale CA

International Classification:

G03B 3100

US Classification:

352 11

Abstract:

A method and system of blending the effective audio sensation in a theater having a plurality of audio speakers driven by a single program signal recorded on a motion picture film strip as the film strip is being projected in the theater, which method and system includes the driving of each of the speakers in the theater with a common program signal through an amplifier having a gain controlled by an analog electrical signal whereby the level of the analog signal determines the volume of the program signal at each of the speakers and creating a digital gain control signal for each of the speakers in response to a control signal recorded periodically on the film strip at locations on the film strip determined by the desired volume of a given speaker at a given time which digital gain control signal is converted to an analog signal and is used for controlling the driving amplifiers of each of the speakers in the theater in which the film is being projected.