Patents Assigned to Telefunken Fernseh und Rundfunk GmbH
  • Patent number: 5455533
    Abstract: An impedance converter includes an emitter follower constructed of a first transistor with a first resistor connected between an emitter electrode of the first transistor and an output terminal. Input to the emitter follower is provided by a second transistor of complementary type, with input signal applied to the base of the second transistor and the emitter electrode of the second transistor coupled to the base of the first transistor with a second resistor. Bias current in the second transistor and second resistor is in constant proportion to bias current in the first transistor and first resistor. Output impedance can be made positive, negative or zero by appropriate proportioning of the first and second resistors.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: October 3, 1995
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Hartmut Kollner
  • Patent number: 5444720
    Abstract: Items of auxiliary information are transmitted in an AM radio broadcast signal by phase angle modulating the AM carrier with digitally encoded data representing the auxiliary information. The items of auxiliary information are allocated to a cyclically recurring number of groups, each group consists of two equal length information blocks. Each information block includes an information word and a check word. Different offset words are superimposed on the respective ones of the check words. The offset words are useful for the synchronization of the information blocks in a receiver.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: August 22, 1995
    Assignee: Telefunken, Fernseh und Rundfunk GmbH
    Inventor: Karl-Heinz Schwaiger
  • Patent number: 5361278
    Abstract: A method of transmitting an analog signal including the steps of converting the analog signal into a digital signal and using windows to subdivide the digital signal into successive blocks. The blocks are evaluated for level changes, and when a level change is below a predetermined level the blocks are overlapped by 50%. The signal segments within the blocks assessed using analysis windows. The signal segments are transformed using subsampling and time domain aliasing cancellation to compensate for aliasing components. The signal segments are inverse transformed and assessed using synthesis windows. The blocks are rejoined in overlapping fashion. When the level change is above the predetermined level the signals are subdivided into blocks and the blocks are overlapped by less than 50%, or not overlapped at all. The signal segments are fully scanned, compressed and transformed. The signal segments are finally inverse transformed and expanded.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: November 1, 1994
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Thomas Vaupel, Detlef Krahe
  • Patent number: 5355170
    Abstract: In order to compatibly transmit teletext data in the form of special characters, fine textures and color hues at higher WST levels, complementary data in the form of one or more associated complementary pages are transmitted for each page of teletext by the broadcaster in addition to the basic teletext data of conventionally structured teletext pages (level 1). The complementary data for some or all teletext pages are transmitted preferably in at least one complementary page. In the receiver, the complementary page(s) associated with a selected teletext page are temporarily stored separately from the corresponding teletext page(s) and processed so that the characters associated with the basic data are displayed in those character positions where there is no complementary data present. The characters associated with the basic data in cooperation with the complementary data are displayed in those character positions where complementary data is present.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: October 11, 1994
    Assignee: Telefunken Fernseh und. Rundfunk GmbH
    Inventors: Gerhard Eitz, Gerhard Moll
  • Patent number: 5231491
    Abstract: A television signal processing system develops a television signal containing wide aspect ratio image information which is compatible with a standard aspect ratio television format. One image line is separated from every group of four successive image lines. The remaining image lines are vertically compressed, whereby vacant regions ("bars") appear along the top and bottom edges of a displayed image. The separated image lines are scrambled and inserted into the vacant regions. An image display including the vacant regions exhibits a standard aspect ratio, while the active image area between the vacant edge regions exhibits a wide aspect ratio.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: July 27, 1993
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Gerhard Holoch
  • Patent number: 5227990
    Abstract: A signal is divided by windows into successive blocks that overlap at least by 50% and signal sections contained in the blocks are evaluated by analysis windows. The signal sections contained in the blocks are subjected to a transformation which permits sub-sampling with compensation of the aliasing components such as, for example, the "time domain aliasing cancellation" method. The spectra resulting from the transformation are subsequently coded, transmitted, decoded after transmission and changed back to signal sections by re-transformation. The blocks including the signal sections are evaluated by synthesis windows and are joined together in an overlapping fashion. The window functions of the synthesis windows are determined in dependence on the window functions of the corresponding analysis windows in the overlap region.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: July 13, 1993
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Thomas Vaupel, Detlef Krahe, Gerhard Dickopp
  • Patent number: 5214742
    Abstract: Transmitting a signal wherein the signals is segmented by means of windows into successive overlapping blocks, the partial signals contained in the blocks are converted by transformation into a spectrum, with the spectra then being coded, transmitted, decoded after transmission and converted back into partial signals by retransformation. Finally, the blocks containing the partial signals are joined in an overlapping manner, with the overlapping regions of the blocks being weighted such that the resultant of the window functions in the respective overlapped regions equals one. To2.2. In order to avoid interferences in adjacent blocks upon changes in the signal amplitude, the length of the window functions is selected as a function of signal amplitude changes. The method is suitable for the treatment of audio and video signals which are subjected to data reduction during transmission.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: May 25, 1993
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Bernd Edler
  • Patent number: 4841465
    Abstract: The invention relates to a function system and its use in image transmission. According to the invention, a vector is transformed with a matrix in such a manner that simple logic addition and linkage circuits are sufficient.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: June 20, 1989
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: The A. Vuong
  • Patent number: 4773084
    Abstract: For the transmission of synchronizing information for a PCM signal transmitted in biphase code, a synchronizing pattern is provided which is composed of a biphase signal that has been shifted by one-half bit period relative to the data portion of the transmitted signal.
    Type: Grant
    Filed: February 18, 1986
    Date of Patent: September 20, 1988
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Werner Scholz
  • Patent number: 4769726
    Abstract: A magnetic tape apparatus for recording of data, including two spaced apart tape guides for guiding a movable magnetic tape therebetween, the portion of the tape between the tape guides being in tension, magnetic heads between the guides for scanning the tape, and a main tape drive which selectively moves the tape continuously in a path which includes a segment extending between the guides past the magnetic heads, the tape guides and magnetic heads being shiftable relative to each other independently of the main tape drive for longitudinally shifting the portion of the tape between the tape guides relative to the magnetic heads.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: September 6, 1988
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Hans-Joachim Platte, Hartmut Schandl, Robert Einsel
  • Patent number: 4752962
    Abstract: Loudspeaker unit including a frame (FIG. 2) serving as sound guide to which the loudspeaker chassis (FIG. 1) is releasably fastened. According to the invention, form-locking cooperating detent means (4-6, 29-31) are provided on the frame and on the loudspeaker chassis. The loudspeaker chassis can be inserted into the frame by means of a relative translatory movement and can be removed by a rotational movement. Thus it becomes possible to install the loudspeaker in the frame and remove the loudspeaker from the frame by means of automatic machinery.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: June 21, 1988
    Assignees: Telefunken Fernseh und Rundfunk GmbH, NEWEK Neue Elektronik-Werke GmbH, Wirth Elektronik GmbH
    Inventors: Karl-Heinz Thiele, Werner Stehn, Gunter Wirth
  • Patent number: 4748437
    Abstract: A picture tube connecting device, including a common integral insulating housing, connector contacts in the common housing for electrically contacting a picture, and at least one potentiometer, including a focus adjusting potentiometer in the housing, electrically connected to the connector contacts for conducting electrical current to the picture tube via the connector contacts. A high voltage connector is provided for electrically connecting a high voltage to the focus adjusting potentiometer.
    Type: Grant
    Filed: July 17, 1986
    Date of Patent: May 31, 1988
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Walter Goseberg
  • Patent number: 4728949
    Abstract: A remote control unit, particularly for a television receiver or a video tape recorder, having a limited number of keys which have different functions that are identified by lettering presented on display elements corresponding to the keys, depending upon which appliance is selected for control. The remote control unit employs a microprocessor which cooperates with plug-in memories for the various appliances, the memories defining the key usages and corresponding lettering, etc. The remote control unit includes an additional display element for providing brief instructions to the user or displaying information received from the controlled appliance via a return channel.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: March 1, 1988
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Hans-Joachim Platte, Gunter Oberjatzas, Walter Vossing
  • Patent number: 4694336
    Abstract: A method for transmitting digital video signals wherein spectral values are sorted according to magnitude and leading zeros are suppressed. In this way, the average word per pixel length can be reduced to about 1 bit, with image quality remaining acceptable.
    Type: Grant
    Filed: April 14, 1986
    Date of Patent: September 15, 1987
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Heinz-Werner Keesen, Gunter Oberjatzas, Hartmut Peters
  • Patent number: 4680566
    Abstract: The invention concerns a coil arrangement with three windings arranged coaxially, where the outer coils are connected in series. The inductances of the outer coils are of equal magnitude and their magnetic fields have opposing polarities.The center winding induces in the series circuit of the outer windings currents which cancel each other out. The outer windings with their stray inductances form a coil which is separated from the center one and can be applied for other purposes.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: July 14, 1987
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Walter Goseberg, Alfred Pollack
  • Patent number: 4649551
    Abstract: Decoder for a frequency keyed signal, particularly an FSK videotext signal. To avoid isochronous distortions, precise matching of the decoder is necessary. Due to the provision of a additional AFC circuit (11) to regulate the natural frequency of the VCO (5) in the PLL loop (3-5) of the decoder, such matching is no longer required.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: March 10, 1987
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Hans-Dieter Sander, Wulf-Christian Streckenbach
  • Patent number: 4639687
    Abstract: The invention concerns a phase control circuit and a special digital controlled oscillator. According to the invention the digital controlled oscillator oscillates at two frequencies which are slightly above and slightly below the input frequency.
    Type: Grant
    Filed: August 12, 1985
    Date of Patent: January 27, 1987
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Werner Scholz
  • Patent number: 4636875
    Abstract: When recording a PCM signal, particularly an audio signal, on the oblique tracks of a magnetic tape, e.g. for example of a videorecorder, errors occur in the digital signal during the change of heads. These errors are removed in that, in the region where the scanning of the heads overlaps, phase matching of the bit clock pulses is effected, the bit patterns are matched and the number of bit clock pulses is increased or reduced before the next change of heads.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: January 13, 1987
    Assignee: Telefunken Fernseh- und Rundfunk GmbH
    Inventor: Werner Scholz
  • Patent number: 4595977
    Abstract: A switched mode power supply, particularly for a television receiver with standby operation, including a protection circuit for limiting the current on the primary side of the power supply transformer and preferably also a protection circuit against too high a voltage on the secondary side of the transformer. According to the invention, a further protection circuit including a thyristor is provided on the primary side so as to periodically block the switching transistor of the power supply oscillator when the current on the primary side becomes too high and exceeds the limit value.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: June 17, 1986
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventor: Wilfried von der Ohe
  • Patent number: 4590531
    Abstract: A pulse code modulated audio signal transmission system which compensates for signal interference in the pulse code modulated audio signal. The system includes a first device for receiving an audio signal and for converting the audio signal into a pulse code modulated audio signal, and a second device for receiving the audio signal and for producing an auxiliary signal corresponding to the audio signal but having a smaller bandwidth than the audio signal. A transmission circuit is connected to the first and second devices for receiving the pulse code modulated audio signal and the auxiliary signal and for producing an output signal which comprises the audio signal with portions of the audio signal which contain interference being substituted with corresponding portions of the auxiliary signal.
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: May 20, 1986
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Hans-Joachim Platte, Walter Voessing, Gunter Oberjatzas, Ernst Schroder