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Holger Opfer

Volkswagen

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Featured researches published by Holger Opfer.

ATZ - Automobiltechnische Zeitschrift | 2006

Richtlautsprecher mit Anwendungen in Kommunikation, Entertainment und Fahrerassistenz

Holger Opfer

Bislang sind in der Automobilindustrie alle Versuche gescheitert, die schweren und Bauraum verschlingenden Lautsprecher durch Flachenlautsprecher zu ersetzen. In einem Projekt der Volkswagen-Konzernforschung werden nun aber andere Ziele verfolgt, bei denen flachige, 4 mm dunne, elektrostatische Folienlautsprecher aus Kunststoff im Dachhimmel verbaut werden, um mittels ihrer ausgepragten Richtcharakteristik ausschlieslich den jeweils darunter liegenden Sitzplatz zu beschallen. Diese Technologie, akustische Signale in einem kleinen Volumen gezielt zu ubermitteln, bietet eine ganze Reihe von Moglichkeiten, neuen Kundennutzen im Fahrzeug darzustellen.

Archive | 2009

Motor vehicle's acoustic behavior evaluating method, involves classifying characteristics of preprocessed acoustic signals into classes, and comparing classes of acoustic signals with reference classification

Holger Opfer; Carsten Spichalsky

Archive | 2005

Device and method for the acoustic communication and/or perception in a motor vehicle

Holger Opfer

Archive | 2008

Loudspeaker Arrangement in a Motor Vehicle

Holger Opfer

Archive | 2007

Data communication method for motor vehicle, involves determining position of terminal e.g. mobile telephone, in motor vehicle by hands-free equipment, and attaching directional loudspeakers and directional microphones to terminal

Holger Opfer; Carsten Spichalsky

Archive | 2007

Lautsprecheranordnung zur Beschallung in einem Kraftfahrzeug

Holger Opfer; Carsten Spichalsky

Archive | 2011

Method for detecting cross-wind of motor vehicle, involves synchronizing transmission signals of ultrasonic sensor units, and determining cross-wind from displacement of frequency between transmission signals and reception signal of units

Holger Opfer; Stefan Brosig; Carsten Spichalsky; Jörg Kreft

Archive | 2008

Device for sound absorption and sound damping, has resonance absorber fleece, where each layer consists of acoustically transparent knitting fleece

Ernst-Herbert Dr. Birkle; Karsten Van Heukelum; Holger Opfer; Heike Walter

Archive | 2005

Electrostatic planar loudspeaker arrangement in a motor vehicle

Holger Opfer

Archive | 2009

Sound sensor i.e. ultrasonic sensor, arrangement for use on rear side of component e.g. bumper, of motor vehicle, has two regions comprising thickness gaps, ramp and slots that cause impedance difference in arrangement

Holger Opfer; Olaf Täger

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Carsten Spichalsky

Volkswagen

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Ernst-Herbert Dr. Birkle

Volkswagen

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Heike Walter

Volkswagen

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Karsten Van Heukelum

Volkswagen

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Alexander Siebeneich

Volkswagen

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Christian Steinmetz

Volkswagen

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Jörg Kreft

Volkswagen

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Maja Schumann

Volkswagen

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Olaf Täger

Volkswagen

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Stefan Brosig

Volkswagen

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