Patents Assigned to U.S.
  • Patent number: 5774293
    Abstract: A recording and/or reproducing apparatus for a magnetic record carrier such as a tape or disk. The apparatus includes a magnetic recording/reproducing head, a guide for positioning the face of the head relative to a recording surface of the record carrier, and an actuator for moving the head relative to the guide in a direction normal to the recording surface. The actuator is driven by a control unit which receives a control signal from a detector upon detection thereby of frictional contact between the face of the magnetic head and the recording surface. That causes the control unit to cause the actuator to move the head so as to increase the distance between the face thereof and the recording surface.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: June 30, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Steven E. Stupp
  • Patent number: 5772917
    Abstract: The invention relates to a luminescent zeolite of the Faujasite type containing Ce.sup.3+ ions. Such a zeolite can for instance be used in the luminescent screen of a low pressure mercury discharge lamp for use in photochemical processes. According to the invention the zeolite further contains cations S.sup.n+, wherein n.gtoreq.2 and the sum of the amount of Ce.sup.3+ ions and the amount of cations S.sup.n+ per unit cell of the zeolite is at least 16. The zeolite exhibits a high quantum efficiency for converting UV radiation of 254 nm into radiation having an emission maximum between 315 and 400 nm, even in case the Ce.sup.3+ ion content is relatively low.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: June 30, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Ulrich H. Kynast, Volker U. Weiler
  • Patent number: 5774086
    Abstract: A voltage amplifier AD comprising two transistors (Q1, Q2) arranged as a differential pair, having collectors which are connected to a positive power supply terminal (VCC) by means of two branches each comprising a resistive load. Each branch comprises at least two resistive elements (R11, R12, R21, R22) arranged in series. The amplifier AD is also provided with means for comparing the potentials of the different nodes of the circuit, which means allow addition of a first and a second current (IO, IO') to the current supplied in a portion of the resistive load of the second branch. These currents allow rectification of the non-linearity of the evolution of the output voltage (Vout) as a function of the input voltage (Vin).
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: June 30, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Benoit Guyot
  • Patent number: 5774269
    Abstract: An image pick-up apparatus (1) which includes a beam splitter (2) for splitting an image into sub-images and several image sensors (3, 4) for picking up the sub-images is provided with a depolarizing element (6) for reducing the linear polarization degree of the light incident on the beam splitter. The electronic image signals of the image sensors (3, 4) are combined so as to form an electronic image signal of a composite image in a combination unit (5). Because the linear polarization degree of the light incident on a mirror surface (27) of the beam splitter (2) is low, the differences between brightnesses of sub-images picked up by individual image sensors are small. Disturbances are thus counteracted in the composite image.The image pick-up apparatus is preferably used in an X-ray examination apparatus (10) in order to reproduce an X-ray image having a high spatial resolution and few disturbances.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: June 30, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Rudolph M. Snoeren
  • Patent number: 5771386
    Abstract: The invention relates to a telecommunication device having software that is used for controlling function routines, which software includes several separately compilable program units. To reduce the time necessary for manufacturing the telecommunication device and the time necessary for implementing software changes, the program units each have a header which contains addresses (Ap1, Ap2, Ad) used for addressing procedures and/or data combined in the program units. Furthermore, a catalogue is provided which is available to all the loaded program units, which catalogue contains references for addressing the headers of the program units. Within the framework of the manufacture of the telecommunication device, the predefined program units need not be linked when the software of the telecommunication device is implemented.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Lothar Baumbauer
  • Patent number: 5771304
    Abstract: A television receiver has a subwoofer box situated inside the cabinet of the television receiver. The subwoofer box has a loudspeaker arranged in a chamber and mounted in such a manner that it is situated outside the space enclosed by the subwoofer box. The chamber is dimensioned so as to accommodate the loudspeaker. This enables the volume of the subwoofer box to be optimized in view of the space available inside the cabinet of the television receiver. Moreover, mounting of the loudspeaker and the wiring thereof is simplified considerably.
    Type: Grant
    Filed: August 2, 1995
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Martinus P. M. Van Den Thillart, Wilhelmus H. M. M. Evers, Johannes A. A. Das, Dirk De Boe, Raoul E. M. Keereman
  • Patent number: 5771308
    Abstract: A method of processing an image representing an object of substantially uniform intensity contrasted against a background of uniform intensity includes the determination of a trace (.increment.) of the image cutting the object in a segment (I) and the scanning of the image by said trace starting from an origin pixel (yl). Firstly, at each current pixel (Pi) with ordinate (yi), a first function ?E(a,yi), V(a,yi)! of stored cumulated sums is determined, computed beforehand over intervals of the trace which are delimited by the origin pixel (yl) and by end pixels defined by the abscissa (yi) of the current pixel and by a semi-width parameter (a), and a particular optimal value ?E(yi); V(yi)! of the first function of the cumulated sums is estimated within limits (al, am) of the semi-width parameter. Then, over the set of pixels of the trace, a second function of said particular optimal values ?E(yi), V(yi)! is constructed, and an optimal value ?E(yo), V(yo)! of the second function is estimated.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Raoul Florent
  • Patent number: 5770487
    Abstract: A method of manufacturing a device whereby a layer structure with semiconductor elements and conductor tracks is formed on a first side of a semiconductor wafer which is provided with a layer of semiconductor material disposed on an insulating layer. Then the semiconductor wafer is fastened with said first side to a support wafer by means of a glue layer, the support wafer being provided with a metallization. Material is then removed from the semiconductor wafer from the other, second side thereof until the insulating layer is exposed. Contact windows are provided in the insulating layer from the first side of the semiconductor wafer before the latter is refastened on the support wafer. These windows are filled with a material which can be removed selectively relative to the insulating layer. The contact windows are opened from the second side of the semiconductor wafer after the latter has been fastened on the support wafer and after the insulating layer has been exposed.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Henricus G. R. Maas, Ronald Dekker, Maria H. W. A. Van Deurzen
  • Patent number: 5771074
    Abstract: To avoid color defects in the motion-compensated luminance signal, which defects occur in non-motion-compensative time-interpolation of the color signal, a method includes the steps of generating a second color difference signal from a first color difference signal supplied at a first field repetition frequency by way of field repetition, the second color difference signal having a second field repetition frequency which is doubled with respect to the first field repetition frequency, generating a third, time-averaged color difference signal from the second color difference signal by time-averaging of two consecutive fields, generating a fourth, spatially high-resolution color difference signal by a spatially high-resolution interpolation of two consecutive fields from the second color difference signal, forming a fifth color difference signal to be supplied as a linear combination of the third and the fourth color difference signals by means of coefficients which are complementary with respect to a constant,
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Achim Ibenthal
  • Patent number: 5769351
    Abstract: Saddle-shaped, flared deflection coil for display tubes, having two arcuate connection portions at the ends and two interposed coil flanks located at both sides of a window. The coil is wound by making use of two wire bundles which are simultaneously fed (by means of two winding arms or flyers). At certain instants during the winding process, the flyers can be moved apart in such a way that a pin can be inserted between the wire bundles. The result is a coil having (triangular) apertures in the flank portions in which one wire bundle extends along one side of each aperture and the other wire bundle extends along another side.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Hendrik D. Van Den Berg, Jannes Michel, Antonius W. M. Mols
  • Patent number: 5771459
    Abstract: A communication system connects stationary and second entities via a cellular radio intermediate network. Each such entity has its own network that is separate from the intermediate network, and connects to the intermediate network by a gateway device. A gateway transfers a message while executing protocol conversion under interpretation of a message header. The conversion maintains in the header at least a predetermined subset of the following: Source Address, Geographic Address, Priority Level, Reliability Level, Delay Requirement, Expiry Time and Repetition Time. A critical distinction exists between connectionless and connection-oriented service.
    Type: Grant
    Filed: June 16, 1995
    Date of Patent: June 23, 1998
    Assignee: U.S. Philips Corporation
    Inventors: David A. Demery, Frans Zijderhand, Edwin W. Mulder
  • Patent number: 5768405
    Abstract: Digital image processing method for local determination of the center and the width of objects in the form of contrasting bands on a background. A digital image processing method, for representation of objects in the form of contrasting bands of substantially uniform intensity on a substantially uniform background, includes a step for the identification of pixels situated on the central lines of the objects, which step is referred to as a "tracking" step. This method is characterized in that the step includes a first filtering operation which is executed by applying, to each image, a series of N lozenge-type-bidimensional, selective, recursive low-pass filters having respective ones of the principal directions angulary spaced apart 180.degree./N in order to determine the direction of each band-shaped object segment as that in which the response of one of the filters is maximum.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: June 16, 1998
    Assignee: U.S Philips Corporation
    Inventor: Sherif Makram-Ebeid
  • Patent number: 5768399
    Abstract: An audio surround-sound system includes a main enclosure, an audio decoder device to decode audio source signals supplied by an audio source device to provide decoded audio signals, and at least a first and second low distortion amplifier housed within the main enclosure to receive and amplify the decoded audio signals. Also included is at least a first and a second speaker element operatively coupled to the at least first and second amplifiers, respectively, to produce the audible signals, where the audible signals are received by the listener from a first and second direction. A local radio transmitter converts a portion of the decoded audio signals into radio modulated signals and transmits the radio modulated signals where a wireless receiver receives and converts the radio modulated signals into remote audio source signals.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: June 16, 1998
    Assignee: Audio Technica U.S., Inc.
    Inventors: Kelly E. Statham, Robert T. Green, III
  • Patent number: 5768398
    Abstract: A signal amplification system wherein a signal coming from a microphone is applied to a loudspeaker via a signal processing system. The signal processing system includes an estimator for estimating the transfer function from the loudspeaker to the microphone. The equalizer is set to a transfer function that is reciprocal to the transfer function from the loudspeaker to the microphone to equalize the transfer function from the microphone to the listeners. The estimator may include an adaptive filter which has a transfer function that approaches the transfer function from the loudspeaker to the microphone.
    Type: Grant
    Filed: April 2, 1996
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis P. Janse, Patrick A. A. Timmermans
  • Patent number: 5767917
    Abstract: An apparatus for automatically synchronizing a video system to one of a plurality of composite synchronizing signals in accordance with a plurality of known video formats, includes a number of synchronizing signal stripper circuits, corresponding, respectively, to a number of types of composite synchronizing signals, a horizontal analyzer, having a plurality of horizontal standard identification circuits corresponding to a identification circuits for each known horizontal synchronizing signal rate for each type of composite synchronizing signal, for determining an approximate horizontal synchronizing signal rate and, a vertical analyzer, having a plurality of vertical rate identification circuits corresponding to the number of different known vertical rates, for determining the vertical synchronizing signal rate.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Viktor L. Gornstein, Alan P. Cavallerano
  • Patent number: 5767829
    Abstract: In Deformed Helix Ferro-electric liquid crystal display devices (DHFLCDs) the memory effect in video applications is interrupted by adapting the data voltages of matrix displays based on MIMs or TFTs, dependent on the data in a previous frame, so that the polarization within a cell always switches to a fixed value (zero). In other types of displays (based on diodes) or for less rapid applications, the polarization can also be readily set at this value.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Antonius G. H. Verhulst
  • Patent number: 5767621
    Abstract: After a plate of electrically insulating, particularly hard and brittle material has been provided with a mask having a very large number of patterned apertures, it is exposed to at least one jet of abrasive powder particles, which jet is moved relative to the plate. In this way a plate is manufactured with a pattern of apertures and/or cavities which are eminently suitable for manipulating electron currents in electronic displays. Plates manufactured in this way may be used, for example, as control plates, spacer plates, or electron transport duct plates in electronic displays.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus C. M. De Haas, Franciscus M. H. Van Laarhoven, Johannes G. Van Beek
  • Patent number: 5765741
    Abstract: A switching device in an auto-reverse deck for a magnetic-tape-cassette apparatus, in which a first pressure roller (24) mounted on a first pressure-roller lever (20), for a first tape-transport direction, can be applied to a first capstan (36) in a first operating position of the switching device and a second pressure roller (25) mounted on a second pressure-roller lever (21), for a second tape-transport direction, can be applied to a second capstan (37) in a second operating position of the switching device, in which a magnetic head is arrangeable on a carrier element (2) mounted on a deck plate (1) and is movable in different positions relative to a transport path of a magnetic tape.
    Type: Grant
    Filed: January 23, 1997
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Norbert Kunze, Stefan Koch
  • Patent number: 5767948
    Abstract: A lithographic device includes a machine frame which supports a substrate holder, a focusing system and a mask holder in a vertical direction. The substrate holder is displaceable parallel to a horizontal X-direction and a horizontal Y-direction perpendicular to the X-direction by a first positioning device, and the mask holder is displaceable parallel to the X-direction by a second positioning device. The substrate holder and the mask holder are displaced synchronously parallel to the X-direction during exposure of a semiconductor substrate. The second positioning device is capable of positioning the mask holder also parallel to the Y-direction and of rotating it about a vertical axis of rotation. Therefore, a displacement of the mask holder has a parallelism to the X-direction which is determined by a positioning accuracy of the second positioning device and which is not adversely affected by a deviation from parallelism and straightness of a guide of the second positioning device.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Erik R. Loopstra, Frank B. Sperling, Hendricus J.M. Meijer, Jan Van Eijk
  • Patent number: 5767458
    Abstract: A graphical tablet includes a pair of parts to be brought into electrical contact with one another under user-interaction. Electrical signals are generated indicative of X and Y coordinates of the contact. The signals are filtered by a low-pass filter. The filtered X and Y signals are sampled with a particular sampling frequency and are held in separate X and Y holding circuits. The cut-off frequency of the filter is at least part of the time substantially lower than the sampling frequency, as each holding circuit has to settle for only increments and decrements relative to its stored sample value. Thus the spectrum of noise rejection is widened with respect to the prior art.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: June 16, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Gerardus J.K.M. Koolen