Patents Examined by John K. Peng
  • 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: 6201582
    Abstract: A circuit for moiré suppression detects the Nyquist frequency in an input video signal. Based on detected alternating structures indicative of the Nyquist frequency, the circuit fades between outputting the input video signal and a low-pass filtered version of the input video signal. When the output signal is applied to a video display, moiré is suppressed.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: March 13, 2001
    Assignee: Philips Electronics North America Corporation
    Inventor: Christian Hentschel
  • Patent number: 6201583
    Abstract: In an image signal input apparatus that performs high-speed input processing of an image signal and, in particular, a brightness signal, a video signal is processed by a clamping circuit so as to achieve a constant reference level, and then input to an A/D converter. The A/D converter samples the video signal synchronously with a clock signal of a frequency 4fsc. The output of the A/D converter is input to a selector directly or via a 4-data arithmetic mean circuit. The 4-data arithmetic mean circuit obtains an arithmetic mean of every four consecutive data output from the A/D converter. The obtained 4-data arithmetic mean data correspond to the brightness signal. After the 4-data arithmetic mean data is stored in a memory through a DMA controller, the data is output to a personal computer via a Centronics® interface, thereby reducing the amount of data memory necessary for input processing to a quarter of the normal amount.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: March 13, 2001
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Satoru Kuwabara
  • Patent number: 6201563
    Abstract: An ATV receiver is provided with a 16-state trellis decoder to achieve improved performance in the presence of NTSC co-channel interference. In one embodiment, the ATV receiver comprises a tuner, a comb filter, and a trellis decoder. The tuner is configured to downmix a selected channel frequency signal to an intermediate frequency signal, where the comb filter is configurable to screen out most of the NTSC co-channel interference. The intermediate frequency receive signal is modified by the comb filter to resemble a partial response signal. The trellis decoder the demodulates the partial response signal in an improved fashion taking into account the state of the trellis encoder and the partial response channel. The trellis decoder may have a 16 state trellis comprised of four 4-state butterflies wherein each edge in the trellis is a single transition.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: March 13, 2001
    Assignee: LSI Logic Corporation
    Inventor: Dojun Rhee
  • Patent number: 6195128
    Abstract: A method of processing digital video information in real time involves reading-in digital data representing pixels of successive video frames, e.g., from a digitizer. The pixel frame data is initially stored and subjected to an idealization treatment to choose and pre-select representative values for pixel characteristics which are then adopted in the further processing. The idealized frame data can then be subjected to compression by deriving further data representing blocks of pixels (mini-blocks) and blocks of mini-blocks (super-blocks) and by generating code words to describe the changes in the pixel data of successive frames. The compressed data is finally stored and/or transmitted.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: February 27, 2001
    Assignee: Eidos Technologies Limited
    Inventor: Stephen B Streater
  • Patent number: 6195132
    Abstract: A noise reduction signal processing apparatus for reducing noises accurately, such as for use in a display apparatus for displaying a video signal, has a median filter (40) which receives the video signal, and which executes a filter processing on the inputted video signal and outputs a reference signal; a subtracter (50) which is connected with the median filter (40), and which outputs a difference signal that indicates a difference between a reference signal outputted from the median filter (40) and the video signal; a minimum value detection circuit (70) which outputs the difference signal from the subtracter (50) or a limitation value, whichever is smaller, as a minimum value signal; and an adder (35) which adds a noise reduction signal obtained on the basis of the minimum value signal output from the minimum value detection circuit (70) and the video signal.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: February 27, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Katsunobu Kimura, Takaaki Matono, Haruki Takata, Tatsuo Nagata, Masato Sugiyama, Yasutaka Tsuru, Koichi Sudo
  • Patent number: 6195134
    Abstract: A horizontal electron-beam deflector capable of preventing circuits from being damaged due to disturbance such as electric discharge with a simple and small circuit configuration, wherein an AFC circuit inputs a control signal indicating a frequency from a computer, the control signal is output to a deflection circuit, the AFC circuit generates a horizontal synchronization pulse signal, and the deflection circuit generates a horizontal deflection signal while controlling a voltage by using the control signal input from the AFC circuit.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: February 27, 2001
    Assignee: Sony Corporation
    Inventors: Shinji Takahashi, Takatomo Nagamine
  • Patent number: 6191822
    Abstract: A separator circuit receives a stream of data including both audio and video components. The separator circuit separates the audio and video components for transmission to appropriate devices. In the preferred embodiment, the separator circuit is part of a decompression engine which decompresses the received stream of data and also separates the audio and video components. Preferably, the decompression engine is implemented within a device configured for coupling to an IEEE 1394-1995 serial bus network. Alternatively, the decompression engine is implemented as a separate dedicated device within the IEEE 1394-1995 serial bus network. After separating the audio and video components, one or both of those components are transmitted from the decompression engine over one or more isochronous channels on the IEEE 1394-1995 serial bus, to the appropriate devices.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: February 20, 2001
    Assignees: Sony Corporation, Sony Electronics, Inc.
    Inventor: Scott D. Smyers
  • Patent number: 6191812
    Abstract: An improved method of tracking a camera in dynamic chroma-keying of the type in which a foreground object is photographed against a multicolored chroma-key screen. The multicolor patterns are created by projection on a monochrome screen, for example by projecting light through a mask on a screen colored with the chroma-key color. The projection of multiple patterns can emulate the use of a single pattern having multiple levels of detail, and can enable lateral tracking of the camera. Sequentially projecting known transformations (for example, rotations) of a pattern adds an extra degree of freedom which further enhances the accuracy of the method.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: February 20, 2001
    Assignee: RT-SET Ltd.
    Inventors: Dekel Tzidon, Aviv Tzidon
  • Patent number: 6191806
    Abstract: A management system and method for use with on-demand cable programming, wherein a customer telephones a cable supplier and requests that a particular video program be played. The management system uses a plurality of video sources, wherein each of the video sources is capable of playing the requested video program. A telephone switch system and routing table are used to route incoming customer requests directly to the interface in control of the video-source serving the region from where the request originated. The volume of requests received from each customer region serviced by the cable supplier is evaluated. If the volume of customer requests surpasses a threshold level, then additional video sources are added to the cable network by the cable supplier.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: February 20, 2001
    Assignee: AT&T Corp.
    Inventor: Daniel J. Mayer
  • Patent number: 6188449
    Abstract: A semiwide-screen television receiver which can provide a horizontally extended picture on a screen. The receiver receives and displays on a cathode ray tube (CRT) an image signal having a 12:9 screen aspect ratio (AR), and includes a cathode ray tube having a horizontal dimension which is larger than that of a conventional CRT having a 4:3 screen aspect ratio. A deflection unit including an inductance variation device for adjusting the inductance value of a horizontal deflection coil is provided, so as to minimize an inductance dispersion of the deflection unit.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: February 13, 2001
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-Wan Hong, Chel-Woon Youn, Sung-Pyo Hong
  • Patent number: 6188440
    Abstract: A conversion unit having a bidirectional conversion function of converting analog video signals into digital image data and vice versa and a processing unit having a function of encoding image data and of decoding encoded data are provided. A data transmission control unit switches the flow direction of each of image data and encoded data in response to an encoder/decoder switch signal. A process control unit performs switching of the receiving/transmitting of a control signal such as a transmission clock signal relating to encoded data in response to a master/slave set signal.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: February 13, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masayoshi Toujima, Hiromasa Nakajima, Yasuo Kohashi, Hitoshi Fujimoto, Misako Matsumoto
  • Patent number: 6184918
    Abstract: A method for monitoring viewing of broadcast data includes detecting a lead tag corresponding to a program in the broadcast data. The broadcast data is monitored for a tail tag corresponding to the program. Whether the program was viewed in its entirety is determined by matching the lead tag with the tail tag.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: February 6, 2001
    Assignee: Intel Corporation
    Inventors: Jean M. Goldschmidt Iki, Anthony Alexander Shah-Nazaroff, Christopher D. Williams, Kathleen Lane
  • Patent number: 6184943
    Abstract: A portable computer system incorporating a rear projection display. The rear projection display is housed in a display enclosure that is movable between an open and closed position, and incorporates either a pliable or deformable projection surface or a projection surface formed of multiple rigid components. When the display enclosure is open, the projection surface is configured to expand beyond the form factor dimensions of the base portion of the portable computer. In the preferred embodiment of the invention, the projection surface is a pliable material that can be safely deformed or collapsed within the display enclosure when it is closed. The rear projection display thereby allows the effective viewing area of a portable computer display to be increased without negatively impacting the form factor dimensions or weight of the portable computer.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: February 6, 2001
    Assignee: Compaq Computer Corporation
    Inventor: Charles A. Sellers
  • Patent number: 6181383
    Abstract: A method and apparatus for preserving audio and video presentation synchronization during the splicing operation by selectively deleting, if necessary, an audio/video access unit to avoid overlapping of audio/video frames in the spliced output stream.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: January 30, 2001
    Assignee: Sarnoff Corporation
    Inventors: Edward C. Fox, Paul Wallace Lyons, Charles Wine
  • 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: 6177963
    Abstract: A video signal distribution system comprises an interface device and video signal input means for receiving TV signals on broadcast channels connected to the interface device. A plurality of video appliances and a plurality of TV sets may be connected to the interface device such that the television sets are arranged to be remote from the plurality of video appliances. A person using the system has a remote control device that may be actuated to emit signals for selecting channels for viewing and to control the video appliances. Each of the television sets includes a repeater arranged to receive the control signals from the remote control device and form corresponding electrical control signals. The interface device receives the electrical control signals corresponding to a selected TV set and directs electrical control signals to a selected one of the plurality of video appliances to provide video signals to the television sets.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: January 23, 2001
    Assignee: Multiplex Technology, Inc.
    Inventors: Richard T. Foye, John B. Crosby
  • Patent number: 6175391
    Abstract: Digital TV receiver including an antenna, a tuner for synchronizing one of a plurality of digital TV signals received at the antenna, the digital TV signal having data streams, and each data stream having a plurality of symbols, a comparing unit for comparing data streams of the synchronized digital TV signal to an already stored symbol pattern of a synchronizing signal in succession, to provide a positive number if found identical as a result of the comparison or either one of a negative value or a zero if found different as the result of the comparison, memories each having an identical initial value the memories corresponding to symbols in the data stream in one to one fashion, an adder for adding signals provided as many as a number of symbols in the data stream from the comparing unit in succession to corresponding initial values in the memories in succession when each of the data streams is received and keeping updating the initial values in the memories by storing the added signals to corresponding mem
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: January 16, 2001
    Assignee: LG Electronics Inc.
    Inventor: Heung Sik Kwak
  • Patent number: 6172713
    Abstract: A color system determination circuit for use with an input video signal having a frequency component is disclosed. The circuit includes a color trap filter for attenuating the frequency component in the input video signal with the color trap filter providing a color burst output signal, a comparator for comparing the color burst output signal of the color trap filter and the frequency component of the input video signal, a maximum value detector which receives the color burst output signal of the color trap filter and a color burst sampling signal and detects a maximum value of the color burst output signal of the color trap filter during a period of the color burst sampling signal, and another maximum value detector which receives the video signal and the color burst sampling signal and detects a maximum value of the video signal during the period of the color burst sampling signal.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: January 9, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Hisao Morita
  • Patent number: 6169587
    Abstract: A circuitry for attaining a fixed raster vertical scan size of a video display apparatus is proposed. The video display apparatus comprises a flyback transformer (FBT) which includes a primary winding and a secondary winding. The secondary winding has a terminal generating a high voltage to an anode of a cathode ray tube (CRT) of the video display apparatus via an external loading. Moreover, the secondary winding has a voltage reference terminal. The raster vertical scan size adjustment circuit comprises a compensation circuit and a raster vertical scan size control circuit. The compensation circuit includes an input terminal adapted to connect the voltage reference terminal of the secondary winding for detecting voltage change at the voltage reference terminal responsive to variation of the external loading. The compensation circuit has an output terminal generating the compensated signal.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: January 2, 2001
    Assignee: Acer Peripherals Inc.
    Inventor: Hsieh Chang-Fa