Patents by Inventor Willem F. Druyvesteyn

Willem F. Druyvesteyn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5724430
    Abstract: An audio-visual arrangement, more particularly, a multi-media terminal, includes a picture screen on which pictures can be displayed. The arrangement further includes a plurality of electro-acoustic converters for reproducing sound that corresponds to audio information generated by the audio signal source. The converters are positioned at regular mutual distances along one side of the picture screen. The ratio of the strength of the control signals applied to the converters has values for which a sound wave concentration is obtained in a listening/viewing area situated dead opposite to the picture screen. With the audio-visual arrangement the nuisance of noise experienced in a living space and/or working space by persons other than the user of the arrangement remains limited. A further reduction of the nuisance can be obtained by a system in which the audio-visual arrangement is combined with means for active noise abatement.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: March 3, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Ronaldus M. Aarts, Willem F. Druyvesteyn
  • Patent number: 5161210
    Abstract: The audio signal is divided into frequency sub-bands, the sub-band samples are quantized according to a predetermined quantizing criterion, and the quantized samples in one or more sub-bands are summed with samples of the auxiliary signal in such sub-bands, the auxiliary signal sample in a sub-band having a maximum amplitude less than half the quantization step used in such sub-band. The combined signal, covering the entire frequency band of the audio signal, can be transmitted or recorded on a record carrier. Upon audio reproduction at a receiver only the audio signal will be audible, the auxiliary signal being masked due to the psychoacoustic characteristics of the human auditory system which are unresponsive to low-level noise in the presence of high amplitude sound. The receiver includes a decoder which analyzes the combined signal into the original frequency sub-bands and re-quantizes the sub-band signals using the same quantizing criterion as at the coder.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: November 3, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Willem F. Druyvesteyn, Abraham Hoogendoorn, Leon M. Van De Kerkhof, Raymond N. J. Veldhuis
  • Patent number: 4996621
    Abstract: Device is provided for reading information from a magnetic recording medium, comprising a SQUID (15), a magnetic yoke formed from two flux guides (3 and 5) and a face (13) for magnetic flux coupling of the SQUID with the magnetic recording medium. The SQUID is provided with connection means (33) for a detection circuit (35).
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: February 26, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Jacobus J. M. Ruigrok, Victor Zieren, Ulrich E. Enz, Willem F. Druyvesteyn
  • Patent number: 4165525
    Abstract: A thin-film magnetic head in which the electrically conductive magnetic material of the core is wound directly a number of times around an electrical conductor which ensures the energization of the head presents the advantage that the manufacture can take place by means of exclusively electroplating methods, since in this configuration no insulating layers are necessary between the material of the core and the conductor.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: August 21, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit J. Koel, Willem F. Druyvesteyn
  • Patent number: RE32545
    Abstract: A magnetic device comprising a first and a second plate of a magnetic material between which domains are situated. An interaction force occurs between the domains in the two plates. Stable domain positions in a second plate define equally stable domain positions in a first plate. One or both plates can be provided with domain guiding structures. Domain displacement in one plate can control a domain displacement in the other so that a variation in the interaction force is produced.
    Type: Grant
    Filed: October 20, 1977
    Date of Patent: November 17, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Jan W. F. Dorleijn, Willem F. Druyvesteyn, Frederik A. De Jonge