Patents Examined by John K. Peng
  • Patent number: 6169583
    Abstract: A method and circuit for determining a noise value that corresponds to the noise in a signal, the signal containing identical signal parts in the noise free signal. Noise values that correspond to the noise in a signal can be used to control noise reduction filters as well as other digital improvement circuits, and in particular picture improvement circuits. This is of particular interest for digital signal processing in modern television receivers. The invention helps to use-picture improvement algorithms that exist in modern digital television receivers more efficiently.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: January 2, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Bernd Merkl, Jens Saenger
  • 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
  • Patent number: 6166772
    Abstract: A home entertainment appliance includes a computer system and a television system. A video monitor or television monitor of the home entertainment system shows a sequence of video frames generated in the appliance based upon at least one received sequence of interlaced video fields each containing a number of scan lines. A video system of the appliance receives a first field, temporarily stores the first field in an input buffer, and then in a loop, while video fields are being received, performs various other steps. The other steps include receiving a next field, compensating the field in the input buffer, deinterlacing the received field with the compensated field in the input buffer, temporarily storing the received field, merging the received field and the compensated field into a video frame of the second sequence, and providing the video frame of the second sequence to a subsequent device.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: December 26, 2000
    Assignee: Compaq Computer Corporation
    Inventors: Christopher Voltz, Drew S. Johnson
  • Patent number: 6166781
    Abstract: A non-linear response correction apparatus and method reduce look up table size and output error. In one embodiment, a range of an N-bit input signal is split into two or more sectors, based on a gradient of a non-linear correction curve and an allowable error, and then a N-bit input signal is divided into U upper bits and D lower bits where U and D depend on which sector contains the input signal. First and second look up tables read first and second data stored therein, respectively, using the upper bits of the digital signal as an address. The first data is the difference between a corrected signal and the input signal, and the second data is the gradient of the corrected signal with respect to the gradient of the input signal. The second data read from the second look up table is multiplied by the lower bits, and the first data read from the first look up table is added to the upper bits.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: December 26, 2000
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Mal-seob Kwak, Jun Sunwoo, In-jun Hwang, Bong-soon Kang
  • Patent number: 6166782
    Abstract: A method and apparatus for reducing visibility of damping wire artifacts in aperture grill display tubes comprises a sensor device for locating the artifacts and responsively generating amplitude values, a processor for receiving the generated amplitude values and responsively calculating correction values, and a compensator device coupled to the processor for utilizing the correction values to correct said artifacts.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: December 26, 2000
    Assignee: Apple Computer, Inc.
    Inventor: Richard D. Cappels
  • Patent number: 6157411
    Abstract: A method and apparatus for compiling a repository of entertainment system data receives entertainment system data, including television program data and software application data, from at least a subset of a plurality of sources. The entertainment system data is then stored in a unitary format for subsequent access by a user.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: December 5, 2000
    Assignee: Intel Corporation
    Inventors: Christopher D. Williams, Jean M. Goldschmidt Iki, Kenneth Alan Moore
  • Patent number: 6151074
    Abstract: A video processing unit (13) that decodes compressed video data and resizes the image represented by the video data. The video processing unit (13) has two processing engines--a decoding engine (24) and a scaling engine (25), which share a memory (23). A memory manager (22) handles data requests from the two engines, and handles reading and writing of the memory (22).
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 21, 2000
    Assignee: Texas Instruments Incorporated
    Inventor: William B. Werner
  • Patent number: 6147720
    Abstract: A projection system includes first and second light sources which are disposed at an angle with respect to each other and are activated during respective different phases of an illumination cycle to illuminate a spot on different sides of a segmented rotary filter wheel. The filter wheel is alternately used to transmit light from one of the light sources, and to reflect light from the other light source, to a light valve, the output of which is projected onto a screen. The wheel segments may be alternately clear and mirrored or may alternately transmit and reflect colors to produce color sequential illumination of the light valve. In addition to filter wheels producing sequences of red, blue, green illumination, including the possibility of splitting a color phase into non-adjacent smaller phases to reduce color artifacts, a simple filter wheel which in two rotations produces a sequence of red, blue, green, cyan, magenta, yellow color illumination, resulting in an expanded color gamut, is also disclosed.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: November 14, 2000
    Assignee: Philips Electronics North America Corporation
    Inventors: William F. Guerinot, deceased, by Marlene Guerinot, legal representative, Matthew Scott Brennesholtz, Douglas A. Stanton
  • Patent number: 6141063
    Abstract: A method and an arrangement for generating a composite video signal in accordance with the chroma-key method in which a virtual background spill signal is generated and added to the composite video signal to avoid darkening effects which are produced when eliminating spill light, and to eliminate brightening effects which are produced in "clean-up" operations. The background spill signal may consist of the product of a virtual spill signal source (SP) and a control signal (k.sub.3). The control signal (k.sub.3) is preferably the difference between a foreground control signal (k.sub.1) and a background control signal (k.sub.2), and both signals should be identical in the foreground and background ranges but different in spill ranges.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: October 31, 2000
    Assignee: U.S. Philips Corporation
    Inventor: Rainer Gehrmann
  • Patent number: 6140809
    Abstract: A received signal is converted in a frequency converter, an output from which is again frequency converted. The second converted output is detected by a detector and then converted into a digital signal to be stored in a memory. A spectrum display is provided by a display. A frequency sweep of local signals supplied to frequency converter is enabled. While holding the frequency sweep for the earlier stage suspended to receive one of the radio waves in service, a signal to the input of the frequency converter may be branched and demodulated by demodulation means. A vertical sync signal is separated in monitor processing means and the frequency of the local signal generator may be swept only during a no-modulation interval contained in a vertical blanking interval, thus extracting a carrier component and a noise component, the levels of which are determined to provide a measure of C/N.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: October 31, 2000
    Assignee: Advantest Corporation
    Inventor: Wataru Doi
  • Patent number: 6141053
    Abstract: A system and method for transmitting blocks of compressed data in an ATM network is disclosed. Compressed data blocks representing a movie are labeled prior to transmission with the amount of data in each block and information regarding the compression ratio of each block and the time into the movie at which the block displays. A server in the system first determines the size of the receiver buffer, and then the minimum number of consecutive blocks that would fit in the buffer. It then determines minimum rate in bits per second by dividing the buffer size by the number of blocks, times 8 bits/byte, times the duration of each block in seconds. The server further instructs the receiver to wait before decompressing and displaying data by an amount of time sufficient to receive the amount of data from the first blocks of compressed data that is equal to the amount of data in the largest compressed data block in the file.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: October 31, 2000
    Inventor: Jukka I. Saukkonen
  • Patent number: 6137952
    Abstract: Image-distorting artifacts are added to selected areas of a color image. A first artifact change is made to a luminance component of a selected area, and at least one other artifact change is made to chrominance components of the selected area. The artifact changes are perceptively balanced such that the artifacts are not perceptible when the image is displayed on a monitor. For example, changes in saturation are selected to balance changes in intensity of luminance. However, when the image is filtered such that one of the artifacts is modified, the remaining artifact becomes visible. Such filtering might be performed by an RGB-to-NTSC converter. Thus, if the RGB-to-NTSC converter is used between an RGB output of DVD-ROM electronics and a computer monitor (in an attempt to make an unauthorized copy), the video signal leaving the RGB-to-NTSC converter will contain perceptible artifacts and, therefore, images of reduced viewability.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: October 24, 2000
    Assignee: Hewlett-Packard Company
    Inventor: Josh N. Hogan
  • Patent number: 6137538
    Abstract: Bus system (1, 2, 3) for a television signal processing device for transferring video data (d8) of at least one video data source (8) and/or supplementary data (d10) of one or more supplementary-data sources (10) between a transmitter (1) and a receiver (3) by means of a bus (2), wherein at the transmitter end (1), a single data stream (d2) for the bus (2) is formed from the video (d8) and/or supplementary data (d10) by means of an interface circuit (4). The interface circuit (4) combines the video and/or supplementary data, source by source, into blocks (db; db1, db2) following each other successively in time and containing identification data (dk; sk, ik) for start and end, or start and length, and content identification, and transfers the blocks serially.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: October 24, 2000
    Assignee: Micronas Intermetall GmbH
    Inventors: Knut Caesar, Manfred Juenke, Stefan Keller, Stefan Rohrer, Thomas Himmel, Kai Scheffer, Eric Schidlack
  • Patent number: 6133949
    Abstract: For measuring the frequency bandwidth of a signal-processing circuit with minimal external influences, a measuring circuit for a signal-processing circuit (1), arranged on an integrated circuit, for processing at least a picture signal is characterized in that measuring pulses are applied to the signal-processing circuit (1), in that the measuring circuit changes the charge of a capacitance (10) arranged in the measuring circuit, dependent on the time shift experienced by the measuring pulses in the signal-processing circuit (1), in that the measuring circuit switches the measuring capacitance (10) before each measuring process to a reference potential for a short time by means of an electronic switch (8), and in that the measuring circuit is arranged on the same integrated circuit as the signal-processing circuit (1) and is activated only during a measuring process.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: October 17, 2000
    Assignee: U.S. Philips Corporation
    Inventor: Joachim Reich
  • Patent number: 6133942
    Abstract: A co-channel interference canceler having a co-channel interference rejection filter and a driving method therefor are provided. The co-channel interference canceler is driven for removing co-channel interference of an NTSC signal existing in a co-channel on receiving of an HDTV signal. In doing so, an error rate of a direct signal path which does not pass the rejection filter and an error rate of a signal path passed through the rejection filter are compared. That is, the error rates, obtained for a predetermined period for each path, are compared using a reference signal, to output a driving signal for selecting the path having the smaller error rate. The error rate is obtained by integrating the number of symbol errors between the reference signal and each path signal. Therefore, the driving of the co-channel interference canceler is controlled according to the driving signal based on the error rate, thereby giving simple circuit structure and increased reliability.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: October 17, 2000
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Myeong-hwan Lee
  • Patent number: 6133961
    Abstract: The invention relates to an architecture making it possible to store and transfer still or moving video images, the said architecture comprising at least one input circuit (E1, E2, . . . , En) allowing access for data intended to make up video images, a memory area (M) making it possible to store video images, at least one video image output circuit (S1, S2, . . . , Sj) and a video bus (B) intended to provide for the transfer of information between the memory area (M), the input circuit and the output circuit, characterized in that the memory area (M) is a general-purpose memory and in that the video bus (B) has a width L greater than or equal to the width of the memory area (M).The general-purpose memory is operated in a centralized manner by a control circuit (CTRL).The invention applies to computer platforms dedicated to the transfer of Broadcast quality images or alternatively to video devices for built-up image animation.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: October 17, 2000
    Assignee: Thomson Broadcast Systems
    Inventors: Thierry Bourre, Patrick Labranche, Mohamed Rebiai, Patrice Bruhat
  • Patent number: 6133958
    Abstract: An arrangement for desynchronizing video signals transported in virtual containers in frames over a synchronous network comprises a feedback loop incorporating a FIFO buffer store and a tuneable oscillator adapted to provide a video line clock from demapped video information. Each virtual container is identified within a frame by a pointer introduced by the synchronous transport process, and the loop is arranged to overcome the interference of these pointers with the color subcarrier in the desynchronized signal. The loop has a bandwidth sufficiently narrow to effectively ignore phase noise created by the pointers. The oscillator frequency is controlled such that the rate of information flow around the loop is substantially constant. Video bytes are written into the buffer store and are then read at a controlled rate determined by the oscillator frequency.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: October 17, 2000
    Assignee: Nortel Networks Limited
    Inventor: James Alexander Shields
  • Patent number: 6130719
    Abstract: A method of recovering synchronization signals contained in a composite video signal. The synchronization signals are generally represented by voltage levels less than the blanking level of the video signal, and display data is represented by blanking level. A digital circuit controls a biasing circuit to generate a biasing voltage. A video signal is biased using the biasing voltage and the resulting biased video signal is provided as an input to an operational amplifier. A second input of the operational amplifier is driven by a reference voltage. The digital circuit monitors the output of the operational amplifier and controls the biasing voltage to cause the operational amplifier to clip the display data from the biased video signal and generate a signal representing synchronization signals.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: October 10, 2000
    Assignee: TeleCruz Technology, Inc.
    Inventors: Kumar Satyanarayana Hebbalalu, Bryan Michael Richter
  • Patent number: 6128467
    Abstract: A multimedia system for delivering multimedia content to customer premises equipment via a circuit of a communications network includes a plurality of servers connected to a plurality of disk systems by a switch and a local area network. The switch includes an arbiter and a plurality of switching elements connected as a crosspoint mesh. Each switching element includes one or more gates and a register connected to a first input of each gate. The arbiter can set the registers to a logical one to allow selected multimedia content to flow through the gate either from the disk systems to the servers, or from the servers to the disk systems in response to customer demands. The local area network is used to transport switching messages from the servers and the disk systems to the arbiter.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: October 3, 2000
    Assignee: Compaq Computer Corporation
    Inventor: Satish Laxmanrao Rege
  • Patent number: 6124896
    Abstract: A corner detector capable of detecting each corner position of a predetermined area from an input signal with a simple structure. There is provided memory means (9B) for storing memorizing an input signal (keyT) and corner detection means (9C) for detecting a point where the signal level becomes the reference signal level or more at first by reading an input signal stored in the memory means sequentially in horizontal direction from an upper limit and a lower limit of a retrieval scope and in vertical direction from the left end to the right end of the retrieval scope, and detecting a point where the signal level becomes the reference signal level or more at first by reading an input signal stored in the memory means sequentially in a diagonal direction at a predetermined angle from each angle of the retrieval scope to detect from the detected points four points whose positions differ.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: September 26, 2000
    Assignee: Sony Corporation
    Inventor: Masafumi Kurashige