Deutsche Thomson-brandt Gmbh

Thomson Licensing

Thomson Licensing S.a.

Harman Becker Automotive Systems Gmbh

Friedhelm Zucker

Yasuaki Morimoto

Christian Buchler

Christian B&uuml;chler

Akira Kawamura

Heinz-J&ouml;rg Schroeder

Heinz-Jorg Schroder

Christian Büchler

Dietmar Uhde

Yoshiharu Chikazawa

Lieu Kim Dang

Lieu-Kim Dang

Stefan Rapp

Heinz J Schroder

A method for determining a position of a phase centre of an antenna arranged in a mobile device, in particular a vehicle, wherein the antenna is operable to receive satellite signals in a global navigation satellite system, the method comprising: receiving, with the antenna, satellite signals from satellites of the global navigation satellite system; determining a direction from which the satellite signals are received based on the received satellite signals; and determining the position of the phase centre of the antenna based on the direction from which the satellite signals are received and stored correlation information indicative of a correlation between the position of the phase centre and the direction from which the satellite signals are received.

Phase centre compensation for high precision GNSS antennas

The invention relates to a method for transmitting a write strategy to a laser driver, and to a pickup and an apparatus for writing to or reading from and writing to optical recording media using such method. According to the invention, the method has the steps of:

Method for transmitting a write strategy to a laser driver

In order to obtain a corrected or compensated focus error signal or track error signal, it is proposed to generate primary and secondary scanning beams incident on adjacent tracks of an optical recording medium and to detect the primary and secondary scanning beams reflected from the optical recording medium in order to derive from them primary-beam and secondary-beam focus error signals or primary-beam and secondary-beam track error signals, which are subsequently normalized in order to obtain the compensated focus error signal or track error signal from the normalized primary-beam and secondary-beam error signals by means of weighted combinations. As a result of the normalization, the corrected or compensated focus error signal or track error signal is generated independently of the reflection properties of the respectively scanned track.

Method for generating a corrected error signal, and corresponding apparatus

The invention relates to a serial data transfer in a numerically controlled control system to update an output value of the control system. A variable write depth shift register is used to update an output value of the control system in such a way that only a number of bits of a data word, which has to be updated to form the updated output value via a serial data transfer is transferred to the variable write depth shift register, so that the output value is updated in a shorter time and can be updated more frequently. The variable write depth shift register is applicable in a numerically controlled control system in which long data words and shift register are used to update the output value via serial data transfer.

Serial data transfer in a numerically controlled control system to update an output value of the control system

A magneto-optical recording or reproducing device having an information erasing means for erasing information or data recorded on a magneto-optical recording medium. According to the invention, the information erasing means comprises an erasing magnet having a field strength sufficient to initialize the magneto-optical recording medium without the assistance of a laser and/or an optical scanning device.

Magneto-optical recording or reproducing device

Device for reading from and/or writing to optical recording media

A method of accelerating the identification of the type of data carrier when the data carrier is inserted in a multimode player and/or recorder which accepts different types of data carriers Looking up a table of use statistics allows the present method to determine which data carrier type is most often used, thus most probable to be encountered, and to select a parameter or a set of parameters associated with this type to test the data carrier.

Fast startup procedure for multimode data players and/or recorders

A device for reading from and/or writing to optical recording media, the device comprising a light source for producing a scanning beam, a photodetector for detecting the scanning beam reflected by the recording medium and a semi-transparent mirror arranged in the beam path for directing the scanning beam onto the recording medium and the reflected scanning beam onto the photodetector. An object of the invention is to improve a device of this type, in particular with regard to reducing the production costs. This object is achieved by the semi-transparent mirror being a plane-parallel plate with a layered structure, and a partially reflective layer being arranged between two small carrier plates.

A device for writing to and/or reading from optical recording media having different structures is described, for example, a device which is suitable both for writing to/reading from digital videodisks (DVD) and conventional CD's. Provision is made for measuring the intensity of each peak in the mirror signal while the objective lens is moving to the recording medium. The intensity e.g. at the instant of the positive-negative crossing of the focus error signal is taken in this case. The type of optical recording medium is determined from the time characteristic and/or the height distribution of the peaks. In order to identify the type of optical recording medium, different properties of the optical recording medium are taken into account, such as reflectivity of the corresponding reflective surface, reduced intensity modulation due to spherical aberration, time characteristic and the like.

Device for writing and/or reading optical recording medium of various designs

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.

Optical format compatible recording and/or playback device

Method for the correction of a tracking error signal during optical scanning of a recording medium in the form of a disc

ROM-RAM Disk

A reproduction and/or recording device for optical recording media which is compatible in respect of varying storage density, despite an interdependence between pit or domain size, and the light spot size. Use is made of a track guidance signal generation device which can be changed over according to the storage density type and is connected to a detector which can be used for recording media of varying storage density, i.e. in the form of the standardized CD, minidisk or MOD, and for optical recording media, which have a comparatively higher information storage density, or smaller track spacings and smaller dimensions of the pits or storage structures.

Reproduction and/or recording device for optical recording media of

G factor alignment

A magneto optical disc system includes a disc having permanently recorded tracks overlain with magneto optical recording material. Data is recorded in the magneto optical material in tracks superimposed over the permanently recorded tracks, using the read-only data to define magneto optical tracks. The magneto optically recorded data is correlated with the prerecorded data for defining the location of data stored in the magneto-optic tracks.

Growing community of inventors

Villingen-Schwenningen, Germany

Friedhelm Zucker