Patents Assigned to Deutsche Thomson-Brandt GmbH
  • Patent number: 6217787
    Abstract: We are familiar with etching printed circuit boards chemically by providing a copper board with a mask and etching copper away chemically at those points where the mask is not present. This is disadvantageous, e.g. from environmental standpoints, because the chemical liquid is increasingly enriched with copper, and, when the liquid has been used, it can no longer be employed and is also difficult to dispose of. The invention is based on the object of providing a method of either applying or removing conductive material electrically.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: April 17, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Hans-Otto Haller
  • Patent number: 6215528
    Abstract: The key component of a digital PAL or NTSC color decoder is a quadrature demodulator for these AM modulated signals. For a SECAM color decoder, however, an FM demodulation is required which is conventionally implemented using a Hilbert filter which is followed by a CORDIC processor and a differentiation stage. It would be advantageous if for multi-standard applications a general-purpose color demodulator for PAL, NTSC and SECAM systems could be implemented on one chip having as much as possible common demodulation processing stages. According to the invention a single common quadrature mixer is used for all three color systems. A resulting bias effect caused by the use of a single mixing frequency is corrected in a clamping stage. The bias effect can also be used for line identification.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: April 10, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Jinan Lin, Maximilian Erbar
  • Patent number: 6215367
    Abstract: The reduction of interfering influences in an LC resonant circuit with an integrated circuit is effected by including the interfering elements of the housing in the resonant circuit. This precludes the occurrence of parasitic radio-frequency oscillation modes. It also ensures good radio-frequency properties and a wide frequency tuning range.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: April 10, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Phillippe Blaud, Martin Rieger, Heinrich Schemmann
  • Patent number: 6215738
    Abstract: A device for reading from and/or writing to optical recording media, including a beam generator, a focus device, which focuses the beam generated onto the optical recording medium at a focal point, a displacement device, which displaces the position of the focal point on the recording medium in accordance with a first direction of movement in dependence on an actuating signal, and a detector, which detects a beam reflected from the optical recording medium and outputs a regulating signal to a regulator. The regulator generates an actuating signal for the displacement device. The invention allows a higher data transfer rate to be achieved with an acceptable outlay. This is achieved by a beam influencing device arranged in the beam path and, in dependence on a further actuating signal of the regulator, influences the position of the focal point on the recording medium in accordance with the first direction of movement.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: April 10, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Hartmut Richter, Dietmar Uhde
  • Patent number: 6208695
    Abstract: A problem in the reception of terrestrially transmitted digital multicarrier broadcast signals is synchronization in case a receiver is switched on or tuned to another channel. The time required by the receiver to reach a given tuning frequency with adequate accuracy and to determine that the currently received signal is not a system-compliant signal is reduced significantly if a characteristic value calculated from correlation values between a windowed and FFT transformed section of the received signal and a reference symbol stored in the receiver does not exceed a pre-defined threshold. In such case the receiver can go ahead to the next tuning frequency. If, however, the characteristic value exceeds that threshold, then a system-compliant signal is found, even with an offset. The multicarrier signal will be further decoded in the normal way. Such conformity check can also be carried out in the subsequent normal reception mode.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: March 27, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Otto Klank, Juergen Laabs, Wolfgang Klausberger
  • Patent number: 6208096
    Abstract: In a tape transport for recording and/or reproducing signals by means of a recording medium using separate winding motors for driving the winding plates, the drive of the winding motors servo units is constructed as open-loop control devices and/or closed-loop control devices. Such servo units can advantageously be used for open-loop control and/or closed-loop control of the drive of the winding motor even during a braking operation.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: March 27, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Peter Mahr, Klaus Oldermann
  • Patent number: 6204882
    Abstract: Recent circuit concepts inject measurement lines, for cutoff and drive control of the cathode current, into each color channel during the vertical frame blanking period. Owing to the physically dependent exponential beam current characteristic profile as a function of the cathode control voltage VK, the exponent &ggr; of the characteristic profile and the ratio of two cathode components IK1 and IK2 may be used to form control reference values for cutoff and drive control, this process being started in each case from a fixed value of the exponent &ggr; or of the ratio of the two cathode currents IK1 and Ik2. However, it has been found that, if a fixed value is assumed for the exponent &ggr; or for the ratio of the two cathode currents IK1 and IK2, it is not possible to achieve an optimum result for displaying monochrome pictures. Thus, according to the invention, the exponent &ggr; is defined as a function of the color tube 1. The aim in this case is to reduce a &ggr;-dependent DC voltage offset u0f to zero.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: March 20, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Helmut Sowig
  • Patent number: 6198706
    Abstract: The invention relates to a method and an arrangement for a compatible recording and/or reproduction device for the reproduction of information from, and/or for recording on, optical information carriers (CD) having differing information storage densities. A light source is used which is adapted to the highest storage density of the information carriers (CD) to be used as regards wavelength and light spot dimensions and the light directed onto the information carrier (CD) is defocused by a defocusing means for the enlargement of the light spot for information carriers (CD) of lower storage density.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: March 6, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Friedhelm Zucker
  • Patent number: 6198878
    Abstract: The bit rate control goals for applications using storage devices with the capability to process a variable bit rate data stream differ from the constant bit rate case. Therefore the encoder control strategy is adapted to this situation. For the first e.g. 80% of the total playing time an average bit rate is produced which is e.g. 95% only of the normal average bit rate. For the remaining 20% of the playing time the value for the desired average bit rate ascends to e.g. 150% of the normal value. During the first 80% the virtual buffer size is increased by a factor of e.g. 100 whereas during the last 20% the virtual buffer size descends to the normal value. Thereby an increased decoding quality can be achieved during e.g. 80% of the playing time. In the remaining playing time there is nearly no loss in the normal decoding quality.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: March 6, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Meinolf Blawat, Carsten Herpel
  • Patent number: 6195318
    Abstract: Method for the correction of a tracking error signal during optical scanning of a recording medium in the form of a disc. In the case of MO discs, the Kerr rotation angle is in general very small, so that so-called enhancement is used for processing. This leads to birefringence effects which are thermally induced on the WO disc during the writing process producing a noise level on the track error signal. According to the invention, an optical scanner arrangement is used to determine light intensities from two mutually perpendicular polarization planes. A noise element, which is produced by interfering polarization rotation of the light, in the tracking error signal is compensated by linking the electrical output signals of the scanner arrangement. Applicable both to MO and WO as well as CD audio, CD video and CD-ROM.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: February 27, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Stefan Rapp, Heinz-Jörg Schroeder, Friedhelm Zucker
  • Patent number: 6191907
    Abstract: A head drum for a magnetic tape apparatus includes a stationary lower cylinder and a rotating upper cylinder on which at least one write/read head is securely arranged and interacts with a magnetic tape with an exchange of electromagnetic signals. Also provided are at least one amplifier which rotates together with an upper cylinder and amplifies the signals coming from the write/read head, and a rotating transformer for transferring electrical signals between the stationary lower cylinder and the rotating upper cylinder. Storage means for electrical energy arranged on the rotating upper cylinder is capable of supplying electrical power to all the electronic components rotating together with the upper cylinder. A controller is securely arranged on the rotating upper cylinder for monitoring the charge state of the storage means and controlling the duration of the energy transfer as a function of the charge state.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: February 20, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Edgar Wursthorn, Jürgen Kaaden, Klaus Oldermann
  • Patent number: 6188435
    Abstract: A circuit for controlling beam current in a picture tube, which circuit calculates current pictures for the R, G, B beam currents in the picture tube, which largely correspond to real beam currents in the color picture tube. The circuit comprises a comparator/integrator which compares a sum of these current pictures with a beam current information item for the purpose of controlling the R, G, B beam currents and/or the picture sharpness. Gamma correction is carried out in the circuit. The circuit may be of analog or digital construction and may advantageously be integrated in a video processor IC. The present circuit is particularly applicable for television sets or computer monitors.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: February 13, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Hossein Ahmari, Gerard Rilly
  • Patent number: 6181385
    Abstract: A method is proposed for processing transitional regions in a picture signal. The picture signal comprises a sequence of digital pixel values. A number of adjacent pixel values, which contain a processing pixel value, are combined to form a processing block. A corrected pixel value is calculated for the processing pixel value. The maximum and minimum pixel values are first determined in the processing block to define the transitional region. The transitional region is then split into a number of sections on the basis of the magnitude of pixel value. Finally, a determination is made as to the section in which the processing pixel value is located. The processing pixel value is allocated a corresponding correction value in order to increase, to reduce or to leave unchanged the processing pixel value, in accordance with a predetermined transfer function.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: January 30, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Carlos Correa
  • Patent number: 6175895
    Abstract: A cache enabling architecture in which an optical storage reading and/or writing device, a caching processor and a mass writing and reading device are each connected to a data bus. The optical storage reading and/or writing device exchanges information directly with the caching processor over the data bus. The caching uses the mass writing and reading device as cache memory.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: January 16, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Xavier Leb{acute over (e)}gue, Rainer Schweer
  • Patent number: 6169586
    Abstract: The method according to the invention is distinguished by the fact that a transmitter identifier (SK) is contained in the received channel (EK), the program locations (P) are assigned once to the received channels (EK), and in the event of a deviation from this assignment, the microprocessor (&mgr;P) controls a search (SL) in order that the desired received channel (EK) is assigned anew to the program location (P).
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: January 2, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Uwe Riemann
  • Patent number: 6169716
    Abstract: The present invention relates to a device for reading from and/or writing to optical recording media which has a data slicer for generating a digital output signal from an analogue input signal, a comparison signal generating unit for providing a comparison signal to the data slicer, and a clock generator for generating a clock signal which is matched to the input signal and/or to the output signal. The device optimizes the function of the data slicer independently of the maximum run length in the analogue input signal. The device has a phase comparison device for comparing the digital output signal with the clock signal, which device is connected to an input of the comparison signal generating unit.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: January 2, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Christian B{umlaut over (u)}chler
  • Patent number: 6167005
    Abstract: The invention relates to a tracking device in which a position of a coil driven actuator is determined using a sensor coil. A reference signal 12 having a determined voltage and frequency is fed to a driven coil. A position of the coil driven actuator is proportional to a distance between the driving coil and the sensor coil. The sensor coil produces an alternating voltage induced by an alternating magnetic field emitted by the driving coil. The alternating voltage is used to determine the position of the actuator.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: December 26, 2000
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Juergen Kaaden, Peter Mahr, Gerhard Reiner
  • Patent number: 6166923
    Abstract: The switched-mode power supply comprises a secondary winding and four diodes for producing two rectified voltages of the same polarity, one of which can be regulated. A connection of the unregulated voltage has connected to it a variable Zener diode as an error amplifier for transmitting a regulating signal to the primary side. The driver stage provides a pulse-width-modulated square-wave signal for driving the switching transistor which is arranged at a high potential between the operating voltage on the input side and a first connection of the primary winding. The second connection of the primary winding is connected with a Zener diode and provides a stabilized voltage for the driver stage. Arranged between the driver stage and the control electrode of the switching transistor there is a differentiating element which produces positive and negative switching voltages for controlling the switching transistor.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: December 26, 2000
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Markus Rehm, Thomas Riesle, Gerard Rilly, Jose I. Rodriguez-Duran
  • Patent number: 6160785
    Abstract: In a further development of the CD, the so-called DVD, a data format was chosen which is upwards compatible with the CD. As a result, existing audio CDs can also be played on a DVD player. If complete error correction is not possible during the reproduction of a CD by an audio CD player, then simple measures for error concealment are additionally taken, but they are not always adequate. However, for cost reasons more complicated methods are not used in an audio CD player, since they would require a more powerful processor and a larger memory. However, a DVD player has this more complex hardware in any event, in order to enable the outstanding video quality that is intended.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: December 12, 2000
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Ingo Hutter
  • Patent number: 6154111
    Abstract: The storage coil has a core and windings which are arranged as conductor tracks on base layers. The base layers each contain only one winding, whose start and end are each passed out on one or more projections on the outer edge of the base layer. In consequence, the projections project out of an opening in a core, for example an E/I core, on which projections the windings of the base layers make contact with one another and with connections. With suitable dimensioning, losses resulting from the skin effect and eddy current losses can be kept very low.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: November 28, 2000
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Markus Rehm, Thomas Riesle, Jose-I. Rodriguez-Duran