Pulse Code Modulation Patents (Class 348/472)
  • Patent number: 10904057
    Abstract: A communications system including a transmitter having a modulator that converts information bits to samples, a transmitter pseudo random number generator that generates a sequence of transmitter random numbers defining a time dilation function, and a transmitter time varying delay processor responsive to the samples and the time dilation function, where the transmitter time varying delay processor dithers the samples in time based on the time dilation function. The system also includes a receiver responsive to the dithered samples from the transmitter, where the receiver includes a receiver pseudo random number generator that generates a sequence of receiver random numbers in sync with the transmitter random numbers, a receiver time varying delay processor responsive to the receiver random numbers and the dithered samples, where the receiver time varying delay processor removes the dithering of the samples, and a demodulator for demodulating the samples to recover the information bits.
    Type: Grant
    Filed: June 2, 2020
    Date of Patent: January 26, 2021
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: John B. Sampson, Ameesh N. Pandya, Yen M. Hoang
  • Patent number: 10482569
    Abstract: Systems, devices, and techniques are generally described to transmit image data. An image file including image data may be identified. The image data may be divided into a plurality of portions. The plurality of portions may include a first portion corresponding to a first position in the image data and a second portion corresponding to a second position in the image data. The image data may be modified to produce a shuffled image. The shuffled image may indicate that the first portion corresponds to a third position and the second portion corresponds to a fourth position. The shuffled image may be sent to a recipient computing device. The recipient computing device may render the first portion at the first position and the second portion at the second position to display the image data.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: November 19, 2019
    Assignee: DISC INTELLECTUAL PROPERTIES, LLC
    Inventors: Steven B. Dunham, Darren P. Ehlers
  • Patent number: 10147202
    Abstract: To encode a texture to be used in a graphics processing system, the texture is first downscaled to generate a lower resolution representation of the texture 41. An upscaled version 42 of the lower resolution version of the texture is then compared to the original texture to determine a set of difference values indicating for each texel the difference between the value of the texel in the upscaled version of the texture and in the original texture 43. An encoded texture data block is then generated for each 8×8 block of texels in the original texture 44. Each encoded texture data block contains a base color value taken from the lower resolution representation of the texture and a set of index values indicating the difference data from the determined set of difference data to be used when decoding the block of texture data to generate the data values to be used for the texture data elements that the block of texture data represents.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 4, 2018
    Assignee: Arm Limited
    Inventors: Jorn Nystad, Anders Lassen
  • Patent number: 10116323
    Abstract: The invention provides an analog-to-digital converter (ADC) converting an input signal to an output signal. The ADC may comprise a main circuit and a comparator coupled to the main circuit. The main circuit may: transfer the input signal by an input transfer block, filter an error signal by a loop filter, and combine the transferred input signal and the filtered error signal to form a combined signal. The comparator may quantize the combined signal to provide the output signal, wherein the error signal may reflect a difference between the combined signal and the output signal.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: October 30, 2018
    Assignee: MEDIATEK INC.
    Inventor: Jen-Huan Tsai
  • Patent number: 9626787
    Abstract: Systems and methods for rendering three-dimensional images using a render setup graph are provided. A dependency graph is accessed. The dependency graph comprises a plurality of supplier nodes, a multiplexer node, and a plurality of graphlet nodes. The plurality of supplier nodes is accessed. The supplier nodes each have an output of a first type. These outputs are connected to the multiplexer node. A graphlet is accessed. The graphlet comprises the plurality of graphlet nodes. An output of the multiplexer node connects to the graphlet by connecting to an input of one node of the plurality of graphlet nodes. The multiplexer is configured to generate an instance of the graphlet for each supplier node connected to the multiplexer node. An image is rendered utilizing the accessed graphlet.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 18, 2017
    Assignee: DreamWorks Animation LLC
    Inventors: Peter McNerney, Evan P. Smyth
  • Patent number: 9442141
    Abstract: An analogue-to-digital converter for converting an analogue input signal into a digital output signal, the analogue-to-digital converter including two conversion paths, each configured to receive a version of the analogue input signal and convert it into a digital bit stream, a first feedback loop configured to provide feed-back, to both paths, that is indicative of a difference between the digital bit streams output by the two paths, and a second feedback loop configured to feed-back, to both paths, that is indicative of an average of the digital bit streams output by the two paths.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: September 13, 2016
    Assignee: QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD.
    Inventors: Gerald Miaille, Michael John Story, Dimitrios Mavridis
  • Patent number: 9230294
    Abstract: Preservation and reuse of intermediate data generated in a render setup graph for computer animation is disclosed. A processing node in the graph can generate intermediate data and, rather than send it directly to a downstream node in the graph, preserve it for reuse during subsequent processing. As a result, a downstream processing node can reuse the preserved intermediate data, rather than wait while the intermediate data is generated by the processing node in realtime. An intermediate data file management module can manage this process by storing the generated intermediate data in a file for preservation, retrieving the stored intermediate data from the file for reuse, optimizing the file storage location for speed and efficiency, and facilitating sharing of the intermediate data during collaboration between users.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 5, 2016
    Assignee: DreamWorks Animation LLC
    Inventors: Evan P. Smyth, Peter McNerney
  • Patent number: 9179033
    Abstract: The present disclosure relates to digital watermarking. One claim recites a method to detect two or more different digital watermarks in media. The method includes: receiving captured imagery of the media, the captured imagery comprising a plurality of image frames; for a first image frame applying a first watermark detector to search for a first digital watermark hidden within the first image frame, in which an electronic processor is programmed as the first watermark detector; and for a second image frame applying a second, different watermark detector to search for a second, different watermark hidden within the second image frame, in which an electronic processor is programmed as the second watermark detector. Other claims and combinations are provided too.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: November 3, 2015
    Assignee: Digimarc Corporation
    Inventors: Alastair M. Reed, Trent J. Brundage
  • Patent number: 9092856
    Abstract: A method and apparatus are provided for filtering banding noise in a signal representative of an image. The method includes detecting, by a banding noise detector, banding noise in a neighborhood of a current pixel of the image, determining, by an adaptive filter weight decision unit, a number of banding steps in the neighborhood of the current pixel, determining, by the adaptive filter weight decision unit, a difference between a current pixel value and a previous output value, selecting, by the adaptive filter weight decision unit, a filter weight based on the number of banding steps, the difference between the current pixel value and the previous output value, and the detected banding noise, and filtering, by a recursive filter, the current pixel value according to the selected filter weight.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: July 28, 2015
    Assignee: STMICROELECTRONICS ASIA PACIFIC PTE. LTD.
    Inventors: Xiaoyun Deng, Lucas Hui
  • Patent number: 8619882
    Abstract: A data modulation circuit has an adder adding an input signal, and an output signal of a memory device; and an output circuit part discriminating and quantizing the output signal of the adder by a predetermined threshold value. The memory device receives and holds the output signal of the adder and a predetermined signal, and supplies the held signals to the adder as an output signal of the memory device.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: December 31, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Uichi Sekimoto
  • Patent number: 8401461
    Abstract: In a wireless communication system including a source device for wirelessly transmitting a video signal, and a sink device for receiving the wirelessly transmitted video signal and displaying the received video signal on a display, the sink device reads out EDID information from a ROM and wirelessly transmits a wireless data signal including the EDID information to the source device. The source device wirelessly receives the wireless data signal including the EDID information and wirelessly transmitted from the sink device, and wirelessly transmits the video signal to the sink device based on the EDID information.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: March 19, 2013
    Assignee: Panasonic Corporation
    Inventors: Makoto Funabiki, Akihiro Tatsuta, Hiroshi Ohue
  • Patent number: 8233088
    Abstract: A method for modulating a video signal. Frames of a plurality of frames are selected for modulation. A first magnitude alternation pattern is designated for each of a first area of a field of the selected frames. A second magnitude alternation pattern is designated for each of a second area of the field of the selected frames. The intensity of a plurality of pixels of a plurality of scan lines of the field of the selected frames is altered as designated by either the first magnitude alternation pattern or the second magnitude alternation pattern.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: July 31, 2012
    Assignee: Koplar Interactive Systems International, L.L.C.
    Inventors: Michael C. Reynolds, James G. Withers, Yousri H. Barsoum, Jesse J. Chounard, II, Edward J. Koplar
  • Patent number: 8212844
    Abstract: A method and a device for encoding the video level of a pixel of a picture into a subfield code word in a display device using a PWM (Pulse Width Modulation) technology and subfields for displaying video picture. The bits of the subfield code word are computed recursively one after the other from the bit having the most significant weight to the bit having the least significant weight. In determining the state of a bit of the subfield code word, a first threshold and a second threshold is associated with the bit, the second threshold being greater than the first threshold, and the video level to be encoded by this bit and its following bits in the subfield code word are compared to the first and second thresholds. A state is allocated to the bit based on the comparison.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: July 3, 2012
    Assignee: Thomson Licensing
    Inventors: Cedric Thebault, Carlos Correa, Sebastien Weitbruch
  • Patent number: 7672520
    Abstract: The invention relates to a method for coding N+1 images comprising a step of temporal analysis of these images generating a low-frequency image and N high-frequency images. It furthermore comprises the following steps: dividing each of the N+1 low-frequency and high-frequency images into N+1 parts; interleaving the N+1 low-frequency and high-frequency images so as to generate N+1 interleaved images and so that the N+1 parts of the low-frequency image are distributed between the N+1 interleaved images, each of the N+1 interleaved images comprising a single part of the low-frequency image; and coding the N+1 interleaved images independently of one another, each of the interleaved images being coded with one and the same number of bits.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: March 2, 2010
    Assignee: Thomson Licensing
    Inventors: Patrick Lopez, Gwenaelle Marquant, Edouard Francois
  • Patent number: 7602443
    Abstract: A method for modulating a video signal. Frames are selected from a plurality of frames for modulation. Intensity of a plurality of pixels of a plurality of scan lines of a field of the selected frames is altered according to at least one pattern or as designated by an adjustment.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: October 13, 2009
    Assignee: Koplar Interactive Systems International, L.L.C.
    Inventors: Michael C. Reynolds, James G. Withers, Jesse J. Chounard, II
  • Patent number: 7586542
    Abstract: A method for modulating a video signal. Frames of a plurality of frames are selected for modulation. A first magnitude alternation pattern is designated for each of a first area of a field of the selected frames. A second magnitude alternation pattern is designated for each of a second area of the field of the selected frames. The intensity of a plurality of pixels of a plurality of scan lines of the field of the selected frames is altered as designated by either the first magnitude alternation pattern or the second magnitude alternation pattern.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: September 8, 2009
    Assignee: Koplar Interactive Systems International, L.L.C.
    Inventors: Michael C. Reynolds, Yousri H. Barsoum, Edward J. Koplar
  • Patent number: 7006568
    Abstract: A video encoding/decoding system based on 3D wavelet decomposition and the human perceptual model is implemented. JND is applied in quantizer design to improve the subjective quality of compressed video. The 3D wavelet decomposition helps to remove spatial and temporal redundancy and provides scalability of video quality. In order to conceal the errors that may, occur under bad wireless channel conditions, a slicing method and a joint source channel coding scenario, that combines RCPC with CRC and utilizes the distortion information to allocate convolutional coding rates are proposed. A new subjective quality index based on JND is presented and used to evaluate the overall system performance at different signal to noise rations (SNR) and at different compression ratios. Due to the wide use of arithmetic coding (AC) in data compression, it is considered as a readily available unit in the video codec system for broadcasting.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: February 28, 2006
    Assignee: University of Maryland, College Park
    Inventors: Junfeng Gu, Yimin Jiang, John S. Baras
  • Patent number: 6954234
    Abstract: A system and method allows a high-bandwidth serial or parallel digital video broadcast data signal to be monitored on a low-cost digital display device such as a computer monitor. The system includes means for extracting horizontal and vertical synchronization information and clock from the digital video broadcast data signal, and a transmitter converting the digital video data signal and the horizontal and vertical synchronization information and the clock into a Digital Visual Interface (DVI)-compliant digital video data signal.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: October 11, 2005
    Assignee: Koninklijke Philips Electronics N.V
    Inventors: Evgeniy Leyvi, Joseph K. Masters
  • Patent number: 6847659
    Abstract: The present invention provides methods and apparatus for reconfiguring protocol data for a multiplexed data stream which is reduced to carry fewer services for cable-side transmission in a cable television plant or the like. More particularly, the present invention provides methods and apparatus for reconfiguring protocol data for a desired combination of multiplexed data stream subgroups contained within an incoming high data rate data stream, such as a high data rate Quadrature Phase Shift Keying (QPSK) modulated multiplexed data stream, when the incoming multiplexed data stream is reduced.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: January 25, 2005
    Assignee: General Instrument Corporation
    Inventors: Arthur P. Jost, Erik Elstermann, Jeffrey D. Kuczynski-Brown, Richard DiColli, Jeffrey Paul Viola
  • Patent number: 6757434
    Abstract: A method and device for tracking a region-of-interest in a sequence of image frames, wherein the boundary of the target region of a previous frame is projected onto the current frame so that a search area in the current frame can be established. For every pixel in the search area in the current frame, a search window is established in the previous frame so as to find a matched pixel within the search window. If the matched pixel is within the ROI of the previous frame, then the corresponding pixel in the current frame is preliminarily considered as a pixel within the ROI of the current frame. This backward matching is carried out using a low pass subband in the wavelet domain. The preliminary ROI in the current frame is then refined using edge detection in a high frequency subband.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: June 29, 2004
    Assignee: Nokia Corporation
    Inventors: Mohamed Khames Ben Hadj Miled, Fehmi Chebil
  • Patent number: 6477185
    Abstract: A demultiplexing and decoding apparatus for coded audio and video data realized with a simple circuit construction and reduced processing load, which processes a packet with higher priority over other packets, prior to the other packets. A plurality of TS packet buffers 73 and 74, for storing input TS packets until they are interpreted, are set in a RAM 7, and processing priority orders are respectively set in the buffers. A PID filter 31 demultiplexes a TS packet, with a PID designated in PID table 36, from a supplied transport stream. A TS packet with higher priority is stored into the TS packet buffer 73, while a TS packet with lower priority is stored into the TS packet buffer 74. Regardless of the input order, the TS packet stored in the TS packet buffer 73 is processed by the CPU 6 prior to the TS packet stored in the TS packet buffer 74.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: November 5, 2002
    Assignees: Hitachi, Ltd., Hitachi ULSI Systems Co., Ltd.
    Inventors: Hironori Komi, Masuo Oku, Takanori Eda, Iwao Ishinabe, Tomohisa Ooishi, Kazuyuki Takada
  • Patent number: 6072837
    Abstract: A subtraction device subtracts a predicted value generated by a predicting portion from a digital picture signal supplied through an input terminal. The subtraction device generates a difference signal as an output signal. A quantizing portion detects an activity of the difference signal, designates the number of quantizing steps corresponding to the activity, and quantizes the difference signal with the number of quantizing steps. The quantizing portion outputs side information to an output terminal.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: June 6, 2000
    Assignee: Sony Corporation
    Inventors: Tetsujiro Kondo, Yasuhiro Fujimori, Kenji Takahashi, Kunio Kawaguchi
  • Patent number: 6005605
    Abstract: Within a desired service area, multiple transmitters at separately located sites simultaneously broadcast the same multi-channel, multi-program signal. Broadcast waves from the transmitters propagate substantially throughout the service area and overlap in a substantial portion of the area. The signals are broadcast as spread spectrum signals and the receivers include despreaders with rake capabilities to obtain enhanced output signals with multi-path reception. In the preferred implementation, the channels are 6 MHz wide channels broadcast in the super high frequency microwave portion of the spectrum. Each such channel carries a multiplexed digital data stream containing packets of information for a plurality of programs, e.g., television programs.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: December 21, 1999
    Assignee: Bell Atlantic Network Services, Inc.
    Inventors: Bruce Kostreski, Allan Schneider
  • Patent number: 5870434
    Abstract: A subtraction device subtracts a predicted value generated by a predicting portion from a digital picture signal supplied through an input terminal. The subtraction device generates a difference signal as an output signal. A quantizing portion detects an activity of the difference signal, designates the number of quantizing steps corresponding to the activity, and quantizes the difference signal with the number of quantizing steps. The quantizing portion outputs side information to an output terminal.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: February 9, 1999
    Assignee: Sony Corporation
    Inventors: Tetsujiro Kondo, Yasuhiro Fujimori, Kenji Takahashi, Kunio Kawaguchi
  • Patent number: 5859876
    Abstract: A digital signal transmission system is provided which minimizes the AM signal envelope distortion caused by multiple digitally modulated carriers in the same band as the AM signal. The system transmits an amplitude modulated signal. Digital carriers for the digital signal are placed both above and below the frequency of the analog AM carrier. Certain digital carriers that are above the frequency of the analog AM carrier have an associated digital carrier that is at an equal frequency offset below the analog AM carrier. The data and modulation placed on the upper digital carrier and its counterpart are such that the signal resulting from their addition has no component that is in-phase with the analog AM carrier. The signal envelope is predistorted to counteract the distortion added by the digital carriers.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: January 12, 1999
    Inventors: Mark J. Dapper, Michael J. Geile, Barry Walter Carlin
  • Patent number: 5727090
    Abstract: The invention implements a run-length file format with improved space-sav qualities. The file starts with a header in ASCII format and includes information such as the file format, maximum X and Y values, and a color palette. The binary raster data include at least one byte for each pixel run to indicate the color selected from the color palette and the run length. Concatenation flags demarcate groups of bytes. According to a first embodiment, each run is indicated by a variable-length sequence of bytes with the color in a fixed-length field and the repeat number in a variable-length field. According to a second embodiment, the color and run length are given in separate byte strings, each having a variable length. The file also includes line offset pointers to permit navigation of the file without decompressing it and thus to facilitate operations such as panning and zooming.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: March 10, 1998
    Assignee: United States of America as represented by the Secretary of Commerce
    Inventor: Martin J. Yellin
  • Patent number: 5659353
    Abstract: Within a desired service area, multiple transmitters at separately located sites simultaneously broadcast the same multi-channel, multi-program signal. Broadcast waves from the transmitters propagate substantially throughout the service area and overlap in a substantial portion of the area. The signals are broadcast as spread spectrum signals and the receivers include despreaders with rake capabilities to obtain enhanced output signals with multi-path reception. In the preferred implementation, the channels are 6 MHz wide channels broadcast in the super high frequency microwave portion of the spectrum. Each such channel carries a multiplexed digital data stream containing packets of information for a plurality of programs, e.g., television programs.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: August 19, 1997
    Assignee: Bell Atlantic Network Services, Inc.
    Inventors: Bruce Kostreski, Allan Schneider
  • Patent number: 5583569
    Abstract: A video camera is adapted to provide an asynchronous computer-friendly output signal instead of a standard analog video format. The output signal becomes a digitally-encoded message wherein each video frame becomes a serialized string of digital data demarcated by a digitally-encoded initiator identifying the ensuing data as characterizing that entire frame. The beginning of the entire set of frames that comprise the total video message is identified by a special header comprising a time stamp code and a format code.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: December 10, 1996
    Assignee: Intel Corporation
    Inventor: Andrew Kuzma
  • Patent number: 5523795
    Abstract: A method and an apparatus capable of transmitting and receiving multiplexed signals as serial data in such a manner that, even in a state where a continuous signal such as an audio digital signal is not in synchronism with another signal such as a video digital signal, the continuous signal can be properly reproduced on a reception side. Address data based on a word clock of another digital signal is sampled on a transmission side in accordance with a sampling clock of the continuous signal, and the sampled address value is included in the multiplexed signals to be thereby transmitted together to the reception side.
    Type: Grant
    Filed: August 16, 1994
    Date of Patent: June 4, 1996
    Assignee: Sony Corporation
    Inventor: Mamoru Ueda
  • Patent number: 5524025
    Abstract: Digital signals, such as digitized television signals, are subjected to a source coding step followed by a channel mapping step. The source coding step causes the television signal to be represented by two or more data streams while, in the channel mapping step, the mapping is such that the data elements of the various data streams have differing probabilities of being erroneously detected at the receiver. In preferred embodiments, a first one of the aforementioned data streams carries components of the overall television signal which are regarded as the most important--for example the audio, the framing information, and the vital portions of the video information, such as motion compensation information--and that data stream is mapped such that its data elements have the lowest probability of error.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: June 4, 1996
    Assignee: AT&T Corp.
    Inventors: Victor B. Lawrence, Arun N. Netravali, Jean-Jacques Werner
  • Patent number: 5495298
    Abstract: An apparatus for concealing error data of pixel data in a digital image signal. The apparatus includes a deframing circuit for detecting errors every predetermined unit to generate a first error flag in high order bit planes including at least the most significant bit plane of bit planes of pixel data in a received digital image signal and for forming a second error flag representing the presence or absence of an error in each of the bits forming the pixel data every pixel data in the high order bit planes on the basis of the first error flag. The apparatus further includes an error correcting device for calculating a plurality of possible data values of the pixel data and for selecting one data value from among the plurality of possible data values, taking the correlation between the pixel data and surrounding pixel data into consideration, on the basis of the second error flag representing the presence or absence of an error in each of the bits forming the pixel data when the pixel data has an error.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: February 27, 1996
    Assignee: Sony Corporation
    Inventors: Masashi Uchida, Tetsujiro Kondo, Hideo Nakaya
  • Patent number: 5475439
    Abstract: An image processing apparatus for performing digital signal processing on an input color video signal is provided with a delay circuit for cancelling a time difference which occurs between a luminance signal component and a chrominance signal component of the input color video signal in accordance with a difference between a filtering processing for the luminance signal component and a filtering processing for the chrominance signal component.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: December 12, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventor: Makoto Shimokoriyama
  • Patent number: 5416525
    Abstract: A composite signal which comprises a video signal situated in the base band and a frequency-modulated audio signal situated outside the base band is coded by an N-bit pulse code modulator or an N-bit noise-shaped pulse code modulator with inadequate quality for, for example, N<5 (in particular for N=1) because, after modulation, demodulation and decoding, the video signal is found to affect the audio signal if, as is usual, the amplitude of the video signal is, for example, ten times greater than the amplitude of the frequency-modulated audio signal. If the amplitude of the video signal is not more than five times greater (in the ideal case one and a half times greater) than the amplitude of the frequency-modulated audio signal, the effect mentioned is apparently considerably reduced.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: May 16, 1995
    Assignee: Koninklijke PTT Nederland N.V.
    Inventor: Antonius J. R. Maria
  • Patent number: 5386239
    Abstract: In a video signal processing system, a single adaptive passband equalizer is used to process a composite Quadrature Amplitude Modulated (QAM) signal encoded with high priority (HP) and standard priority (SP) components. The equalizer output is phase corrected by a de-rotator, and filtered to separate the HP and SP components. Error signals respectively representing HP and SP phase errors are developed. One of the error signals controls the operation of the de-rotator. Both error signals are used to generate updated coefficients for the adaptive equalizer. Afterwards the HP and SP components are decoded and combined.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: January 31, 1995
    Assignee: Thomson Consumer Electronics, Inc.
    Inventors: Tian J. Wang, Lauren A. Christopher
  • Patent number: 5329360
    Abstract: Image data multiplexing apparatus for multiplexing digital luminance and chrominance data of a representation of an image into multiplexed data blocks of a predetermined length, along with a corresponding demultiplexing apparatus, is described. Each of the multiplexed data blocks comprises a luminance data section comprising luminance data from a portion of the representation, a chrominance data section comprising chrominance data from the portion of the representation, a portion address indicative of the position in the representation of the portion, and a block offset pointer indicative of the position in the multiplexed data block of the boundary between the luminance data section and the chrominance data section.
    Type: Grant
    Filed: January 27, 1993
    Date of Patent: July 12, 1994
    Assignee: Sony United Kingdom Limited
    Inventors: Clive H. Gillard, James H. Wilkinson
  • Patent number: 5329375
    Abstract: In the recording apparatus and reproducing apparatus employing variable length coding, a formatting which prevents propagation of error due to transmission route error is realized. The input quantized value is coded in variable length and recorded in a first memory. The variable length code words recorded in the first memory are read out and formatted, and recorded into a second memory. In reproduction, the quantized value is decoded in the reverse sequence. By executing variable length coding and formatting in a pipeline operation by using two memories, high speed input signals such as moving picture signals can be formatted. Components of the recording apparatus and reproducing apparatus can be shared, and the circuit scale may be effectively reduced.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: July 12, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tatsuro Juri, Masaru Nakahama
  • Patent number: 5323232
    Abstract: A decimation or interpolation filter is selectively used for decimation or interpolation of pixel data of a chrominance component of a video signal, In general, the chrominance signal and the luminance signal are closely related to each other and their edge pattern data coincide with each other when reproduced on a picture screen. A filter device for decimation or interpolation of the chrominance signal is arranged to perform a number of filtering actions depending on the presence or absence and location of edge pattern data. The present, absence, and location of the edge pattern data is detected using a luminance signal which is neither decimated nor interpolated.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: June 21, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideki Otaka, Masakazu Nishino, Tatsurou Juri, Shinya Kadono
  • Patent number: 5301018
    Abstract: In a data compression process such as employed to compress video or other data, it is preferable not to compress the image data representative of the video image in a sequential format, or to take the data from the same area of the image. To equalize the information content of the data prior to compression, the present shuffling/deshuffling technique divides the video image into a multitude of image representing blocks, and selects a predetermined number of the image blocks from different spatial locations in the image, to form a succession of data sets representative of the video image information. That is, the selection of the image representing blocks is such that the information content (complexity) in each data set is similar to the information content in each other data set and further similar to the average information content of the entire video image.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: April 5, 1994
    Assignee: Ampex Systems Corporation
    Inventors: Peter Smidth, Charles H. Coleman, Sidney D. Miller
  • Patent number: 5298992
    Abstract: A process for coding a plurality of compressed video data streams in a time ordered sequence. Each compressed data stream includes coding of frame to frame differences of a video segment, which are represented as a compressed M.times.N exclusive-OR plane of pixel change values and location displacement control values for an output pointer into a decompressed video frame. By coding frame to frame differences in an exclusive-OR values, the replay process is made bidirectional, allowing for both forward and reverse playback of the video segment.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: March 29, 1994
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Pietras, Arturo A. Rodriguez, Andres J. Saenz
  • Patent number: 5293228
    Abstract: A method for the coding of images represented by source signals by means of which a luminance signal is formed by linear combination, using positive coefficients of the source signals, and at least one color signal, the luminance and color signals being digitized, sampled at the same resolution, and subjected to a reversible mathematical transformation in the frequency domain. The method comprises the steps of quantizing and assigning a code value to the continuous component and to each component of a set of alternating components of the transformed luminance signal, and quantizing and assigning a code value to only the continuous component of each of the transformed color signals, a set of alternating components being reconstructed by estimation during the decoding for each of the transformed color signals. The method can be applied to color images of any type represented as the superimposition of monochromatic images, whether the images are still images or motion images.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: March 8, 1994
    Assignees: France Telecom, Telediffusion De France S.A.
    Inventor: Bernard Marti
  • Patent number: 5289508
    Abstract: A clock information transmitting device coupled to a digital processing circuit which receives a transmission signal and generates a coded transmission signal includes a PLL circuit for generating a first signal and a sampling clock signal, both being synchronized with a synchronizing signal in the transmission signal. The sampling clock signal is used in the digital processing circuit. A clock information generating part counts pulses of a transmission clock signal and generates clock information indicating a number of pulses of a transmission clock signal in response to one of the synchronizing signal and the first signal generated by the PLL circuit. A multiplexer outputs a multiplexed signal including the clock information and the coded transmission signal to a transmission path.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: February 22, 1994
    Assignee: Fujitsu Limited
    Inventors: Yoshiyuki Wada, Toshihiro Yamanaka
  • Patent number: 5285275
    Abstract: A method of and a circuit for decoding compressed picture image data wherein compressed picture image data of a variable length can be decoded at a fixed high rate. A buffer memory into which compressed picture image data are to be written has a capacity greater than an amount of object compressed picture image data for one frame. Before compressed picture image data are written into the buffer memory, it is checked as to whether or not the buffer memory has an empty space into which such compressed picture image data for one frame can be written. When the checking proves that the buffer memory has such empty space, the compressed picture image data are written into the buffer memory, but on the contrary if the buffer memory has no such empty space, the picture image data are abandoned and not written into the buffer memory.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: February 8, 1994
    Assignee: Sony Corporation
    Inventor: Tomomi Abe
  • Patent number: RE40107
    Abstract: The invention is a data pipeline system which synchronizes the display of digitized audio and video data regardless of the speed at which the data was recorded on its linear medium. To do this, the video data is played at a constant speed, synchronized by the audio speed. Further, the invention uses a method of “staging” data in storage buffers, i.e., ring buffers, which encourages efficient use of the viewer module resources by not permitting the viewer to read excessive amounts of data at any one time, i.e., to read only enough data into any one ring buffer so that the amount of data in the ring buffer is roughly equivalent to the amount of data in the other ring buffers and yet permitting the viewer to read large enough chunks of data to promote efficient use of the fill system.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: February 26, 2008
    Assignee: Avid Technology, Inc.
    Inventors: Eric C. Peters, Stanley Rabinowitz
  • Patent number: RE34810
    Abstract: A method and apparatus is disclosed for controlling the sampling of a composite analog color video signal so that the analog signal is sampled at precise locations relative to the phase of the color subcarrier of the color video signal in the absence of modulation. The invention thereby enables a digitized signal having a constant phase relationship relative to the unmodulated subcarrier phase to be provided which can be advantageously used in magnetic recording and reproducing apparatus. Since the constancy of the location of the samples relative to the phase of the color burst is maintained prior to recording, there is no phase error that would pose a problem during reproducing of the signal.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: December 27, 1994
    Assignee: Ampex Corporation
    Inventors: Maurice G. Lemaine, Leonard A. Pasdera
  • Patent number: RE46160
    Abstract: An original blanking period of a video signal is shortened to a set blanking period, and audio data is multiplexed into a resulting superimposing period. Table distinguishing data indicating the length of the superimposing period is inserted into the period as a blanking signal. With this configuration, it is possible to enable transmission and reception of an audio signal in a system capable of transmitting and receiving a video signal.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: September 20, 2016
    Assignee: Sony Corporation
    Inventor: Hiroshige Okamoto
  • Patent number: RE46297
    Abstract: An original blanking period of a video signal is shortened to a set blanking period, and audio data is multiplexed into a resulting superimposing period. Table distinguishing data indicating the length of the superimposing period is inserted into the period as a blanking signal. With this configuration, it is possible to enable transmission and reception of an audio signal in a system capable of transmitting and receiving a video signal.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: January 31, 2017
    Assignee: Sony Corporation
    Inventor: Hiroshige Okamoto