Patents by Examiner John K. Peng

Patent number: 6330033
Abstract: A delay tracker for a signal processing system, which delay tracker utilizes a special code or pulse on the active portion of the tracked signal with the system including a pulse detector later in the system subsequently recognizing the special code or pulse in order to identify such signal and ascertain any delays associated with the signal for use by the system including possible resynchronization of the tracked signal with another signal associated therewith.
Type: Grant
Filed: March 21, 1996
Issued: December 11, 2001
Inventor: James Carl Cooper
Patent number: 6310645
Abstract: A method and apparatus for measuring a characteristic of a communication signal modulated with a composite video signal without the need for a synchronizing device. Samples are taken of an intermediate signal derived from the received communication signal that represents the power spectrum of the communication signal at different instants of time. From a priori knowledge of the spectral characteristics of the communication signal modulated with a composite video signal, predetermined features of the communication signal are identified based on the relative values of the samples collected over a period of time equal to an entire frame of the composite video signal. The sample with the maximum value of a plurality of sample values collected for one frame is coincident with the occurrence of a vertical synchronization pulse of the composite video signal, which occurs when no modulation is present, and therefore is representative of the power of the communication signal at the visual carrier frequency.
Type: Grant
Filed: November 10, 1998
Issued: October 30, 2001
Assignee: Antec Corporation
Inventors: Semyon Lapushin, Boris Smychkovich, Alexander Birger
Patent number: 6295093
Abstract: A closed-caption broadcasting and receiving method and apparatus. According to the closed-caption broadcasting method and apparatus, character information and control information are inputted, and a control code of 2 words and a character code of 2 words including a syllable character completion type code are produced. The control code is obtained by combining the control information with a mode control bit and a parity bit, and the character code is obtained by combining the character information with a mode control bit and a parity bit. A digital-modulated caption signal is produced by inputting the control code and the character code, and is coded on a scanning line which does not affect a television video signal to be transmitted.
Type: Grant
Filed: May 5, 1997
Issued: September 25, 2001
Assignee: Samsung Electronics Co., Ltd.
Inventors: Hyun-Jeong Park, Jin-Hwa Yang, Jum-Han Bae
Patent number: 6271891
Abstract: A video signal processing circuit in which nearly 100% of a largest possible dynamic range can be used, desired contrast is obtained, and desired brightness characteristics are obtained by an increasing in luminance of a screen. The circuit has an RGB amplifier which amplifies three primary color video signals R, G, and B by a predetermined gain and in which the gain is controlled by a gain control signal, A/D converters for converting analog three primary color video signals which are generated from the RGB amplifier into digital signals respectively, inverse gamma correcting circuits for effecting an inverse gamma correction to the three primary color digital video signals respectively, an OR circuit and a peak holding circuit for detecting peak levels of the analog three primary color signals, and a gain control signal generator for generating a gain control signal in accordance with the peak levels.
Type: Grant
Filed: June 18, 1999
Issued: August 7, 2001
Assignee: Pioneer Electronic Corporation
Inventors: Shuji Ogawa, Hirofumi Kawaguchi, Nozomu Kikuchi, Junichi Usui, Masayuki Takeda
Patent number: 6259477
Abstract: A joint spatial-temporal alignment of video sequences uses a subsampled version of a reference video sequence for correlation with a corresponding subsampled version of a test video sequence in an iterative manner. The subsampled reference video sequence is obtained by detecting a temporal transition field in the reference video sequence, and then selecting a pair of fields from the reference video sequence that straddle the transition field separated by a given number of fields (time interval). Then starting from a current field of the test video sequence a pair of fields is selected separated by the same number of fields and correlated with the subsampled reference video sequence. If the correlation criteria are not satisfied, the current field in the test video sequence is incremented by one and the correlation process repeated until spatial-temporal alignment is achieved.
Type: Grant
Filed: June 23, 1998
Issued: July 10, 2001
Assignee: Tektronix, Inc.
Inventor: Shane Ching-Feng Hu
Patent number: 6252626
Abstract: Apparatus and methods for system and method for testing and aligning a CRT which can sequentially perform all of the tests needed to precisely align the CRT and provide real-time feedback for operator adjustments. The system can integrate each of the measurements and automatically verify measurements previously performed as required. An improved color CCD camera is also provided which can maintain focus irrespective of variations in the thickness and glass curvature of the CRT screen. Further, photodiode optical filter and lens assemblies and wobulator assemblies can be incorporated into the system to further improve the testing and aligning of the CRTs.
Type: Grant
Filed: March 25, 1997
Issued: June 26, 2001
Assignee: Image Processing Systems, Inc.
Inventors: Eric S. Buckley, Bruce W. C. Lee, Branko Bukal, Wayne G. Dawe, Andrew G. Noonan, Todd R. Richardson
Patent number: 6222593
Abstract: In a system according to the invention, fine image data 2 created and output by a personal computer 1 is input to an image processing/dividing section 4. The image processing/dividing section 4 determines, on the basis of parameters stored in a projector arrangement storage 5, which portion of the fine image data 2 is output to which projector, thereby performing a predetermined processing. Digital signals from the image processing/dividing section 4 are input to a plurality of D/A converters 6, respectively, where the signals are converted to analog signals. Images in the form of the analog signals are projected onto a screen 8 from projectors 7a-7d. Thus, the image projected on the screen 8 is constituted of accurately positioned images, and hence is a very fine image.
Type: Grant
Filed: May 30, 1997
Issued: April 24, 2001
Assignee: Olympus Optical Co. Ltd.
Inventors: Masaki Higurashi, Tatsuo Nagasaki, Yasuhiro Komiya, Koutatsu Oura, Ganglu Jing
Patent number: 6215527
Abstract: An contour correcting circuit for correcting the contour without deterioration of image quality of the video signal, comprising a first HPF for extracting the high frequency signal component of the video signal supplied from an input terminal Tin, a second HPF for differentiating the output of the first HPF additionally, and a correlator for synthesizing the output signals of the output and the inverted output of said first HPF, and the output of the second HPF to form a signal having a predetermined signal waveform, wherein the correlator forms a signal waveform of the preshoot portion and overshoot portion with the first order differential output which is relatively static at the inflection point of the video signal, synthesizes a second order differential waveform so as to be a sharp signal waveform at the middle portion, and performs sharpness processing of the video signal by use of the contour correction signal.
Type: Grant
Filed: July 6, 1999
Issued: April 10, 2001
Assignee: Sony Corporation
Inventors: Hiroshige Okamoto, Yoko Takahashi, Masaru Miyamoto, Atsuko Tsukimura
Patent number: 6211925
Abstract: A video intermediate-frequency signal processing device capable of receiving FM broadcasts, includes a first FM detecting unit for demodulating an intermediate-frequency signal from a sound intermediate-frequency detecting unit using a phase-locked loop, and for furnishing a demodulated FM signal, a second FM detecting unit for detecting or demodulating a reference signal applied to generate a reference DC voltage, a comparator for obtaining a difference between the modulated FM signal from the first FM detecting unit and the reference DC voltage from the second FM detecting unit, and for furnishing, as a sound signal, a signal having a value corresponding to the difference, and a feedback unit for, when receiving FM broadcasts, filtering the output of the comparator, and feeding the filtered output back to a low-pass filter of a phase-locked loop included in a video detecting unit.
Type: Grant
Filed: November 18, 1998
Issued: April 3, 2001
Assignee: Mitsubishi Denki Kabushiki Kaisha
Inventor: Kazuyuki Kikuchi
Patent number: 6208386
Abstract: Apparatus for automatic electronic replacement of a billboard in a video image including an automatic camera orientation measurement apparatus including motion measurement means operative to measure the Field of View (FOV) of the TV camera relative to a known reference position.
Type: Grant
Filed: May 13, 1997
Issued: March 27, 2001
Assignee: Orad Hi-Tec Systems Limited
Inventors: Itzhak Wilf, Avi Sharir, Michael Tamir
Patent number: 6208376
Abstract: A communication system easy to be operated upon as to the display method of images generated by image generating units of a plurality of communication terminals and as to the control of each image generating unit.
Type: Grant
Filed: April 21, 1997
Issued: March 27, 2001
Assignee: Canon Kabushiki Kaisha
Inventors: Koichiro Tanaka, Akitomo Sasaki, Hiroki Yonezawa
Patent number: 6208383
Abstract: A soft scrolling method and apparatus of closed-caption words whereby caption information which is encoded in a horizontal line of each field of a television broadcasting signal which does not affect the broadcasting signal is displayed on a display screen of a receiver, as being scrolled line by line by selection of a viewer. According to the method, whether or not the present mode is a soft scroll mode is discriminated, and if so, character data is read out from a display memory, in which decoded caption information is stored, for a line or several lines at predetermined intervals into which a one-row scrolling time is equally divided. The readout character data is converted into a video signal to be displayed on the display screen.
Type: Grant
Filed: May 5, 1997
Issued: March 27, 2001
Assignee: Samsung Electronics Co., Ltd.
Inventor: Hyun-Jeong Park
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
Issued: 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
Issued: 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
Issued: 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
Issued: 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
Issued: February 27, 2001
Assignee: Eidos Technologies Limited
Inventor: Stephen B Streater
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
Issued: February 27, 2001
Assignee: Sony Corporation
Inventors: Shinji Takahashi, Takatomo Nagamine
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
Issued: February 27, 2001
Assignee: Hitachi, Ltd.
Inventors: Katsunobu Kimura, Takaaki Matono, Haruki Takata, Tatsuo Nagata, Masato Sugiyama, Yasutaka Tsuru, Koichi Sudo
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
Issued: February 20, 2001
Assignee: RT-SET Ltd.
Inventors: Dekel Tzidon, Aviv Tzidon