Additional Modulation Of Picture Carrier (e.g., Quadrature) Patents (Class 348/475)
  • Patent number: 9264740
    Abstract: Methods and apparatus for estimating received error rates. In one embodiment, the estimation of received error rates is conducted in relation to a bus interface such as a high-speed High-Definition Multimedia Interface (HDMI) interface, and the method utilizes corrupted symbols that violate TMDS symbol rules, the corrupted symbols being easily detected and counted. In one exemplary implementation, a symbol error rate (SER) can be estimated from the number of detected invalid symbols. The SER can be used to diagnose the performance of the HDMI interface, and optionally as a basis for selecting or implementing corrective action(s).
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: February 16, 2016
    Assignee: Apple Inc.
    Inventor: Colin Whitby-Strevens
  • Patent number: 8477248
    Abstract: A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: July 2, 2013
    Assignee: Sigmatel, Inc.
    Inventors: Jon David Hendrix, Jeffrey Donald Alderson, Glen Ragan
  • 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: 8199260
    Abstract: In a VIF circuit for synchronously detecting a picture signal from an AM-modulated PIF signal, the accuracy of a picture signal to be demodulated is maintained even in a state of overmodulation. A comparator (68) determines whether the picture signal exceeds VTH, which is a state of overmodulation. In a period in which the signal is less than or equal to VTH, a switch circuit (56) inputs an output voltage of an APC filter (54) to a VCO (48), and a PLL is formed. The PLL operates so as to lock onto the PIF signal, and reproduces a carrier wave. On the other hand, in a period in which the signal exceeds VTH, the switch circuit (56) inputs an output voltage VSH of an SH circuit (58) to the VCO (48). The SH circuit (58) holds the voltage of the APC filter (54) that is in a locked state in a horizontal synchronizing period and uses the voltage to control the VCO (48), whereby free run and frequency drifting are minimized.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: June 12, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tsutomu Tanaka, Mutsuki Niki
  • Patent number: 8111327
    Abstract: A method for audio/video synchronization and an apparatus thereof are provided. At least one dynamic synchronization checkpoint is disposed on the playback sample number axis of a video. Whether or not the audio and the video are synchronized is checked when the playback sample number of the video is set the dynamic synchronization checkpoint. The video is paused playing if the playback speed of the video is too fast, and those delayed playback sample number of the video having not been played are skipped if the playback speed of the video is too slow. Furthermore, the location of the dynamic synchronization checkpoint and the frequency of performing synchronization detection are adjusted according to the playback time jitter between the audio and the video.
    Type: Grant
    Filed: May 27, 2007
    Date of Patent: February 7, 2012
    Assignee: Industrial Technology Research Institute
    Inventors: Hung-Cheng Shih, De-Hui Shiue
  • Patent number: 7962012
    Abstract: A BD-ROM has recorded therein an AV Clip generated by multiplexing a video stream and a graphics stream. The graphics stream represents an interactive display to be overlayed with the video stream, and includes a sequence of three Button State groups. The interactive display includes a plurality of buttons, each of which changes from a normal state to a selected state, and from the selected state to an active state, according to a user operation. In the three Button State groups in the graphics stream, the first-order group (N-ODSs) is made of a plurality of pieces of graphics data, which represent normal states of the buttons, the second-order group (S-ODSs) is made of a plurality of pieces of graphics data, which represent selected states of the buttons, and the third-order group (A-ODSs) is made of a plurality of pieces of graphics data, which represent active states of the buttons.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: June 14, 2011
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Yahata, Tomoyuki Okada, Wataru Ikeda, Joseph McCrossan
  • 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: 7576804
    Abstract: A triax transmitter interface for transmitting a video signal on a triax cable comprises a video signal input port, a first modulator for modulating a luminance component of a video signal received at said input port onto a first carrier and a second modulator for modulating a chrominance component of the video signal onto a second carrier, and a triax output port for outputting said modulated carriers to a triax cable. The first modulator is a quadrature modulator adapted to modulate luminance components of two video image lines simultaneously and in quadrature onto said first carrier. A receiver interface has a quadrature demodulator for restoring the luminance component.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: August 18, 2009
    Assignee: Thomson Licensing
    Inventor: Rudolf Koppe
  • Patent number: 7333113
    Abstract: A system for capturing motion comprises: a motion capture volume configured to include at least one moving object having markers defining a plurality of points on the at least one moving object; at least one mobile motion capture camera, the at least one mobile motion capture camera configured to be moveable within the motion capture volume; and a motion capture processor coupled to the at least one mobile motion capture camera to produce a digital representation of movement of the at least one moving object.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: February 19, 2008
    Assignees: Sony Corporation, Sony Pictures Entertainment Inc.
    Inventor: Demian Gordon
  • Publication number: 20080024660
    Abstract: A sign detection device including a first comparing device for comparing a first input signal with a first threshold signal in a first period and a second period to generate a first output signal; a second comparing device for comparing a second input signal with a second threshold signal to generate a second output signal; a converter for optionally changing the polarity of the second output signal to obtain a third output signal; and an operator coupled to the first comparing device and the converter for performing a logic operation of the first output signal and the third output signal to obtain polarity information of the product of the first input signal and the second input signal.
    Type: Application
    Filed: July 26, 2007
    Publication date: January 31, 2008
    Applicant: Mstar Semiconductor, Inc.
    Inventor: Fucheng Wang
  • Patent number: 6415059
    Abstract: Data compression apparatus in which input data is compressed according to a target output data quantity using a stage of data quantization, the apparatus comprises: one or more trial quantizers for selecting a degree of quantization so that the target output data quantity is not exceeded; a data selector for selecting a subset of the current data to be quantized; a data store for storing the subset of data; a backsearch quantizer and dequantizer for sequentially quantizing and dequantizing the subset of data at a plurality of degrees of quantization including the degree of quantization selected by the trial quantizer(s) and one or more harsher degrees of quantization; a comparator for comparing data quantized and dequantized by the backsearch quantizer with the stored subset of data, to detect errors introduced by the quantization and dequantization by the backsearch quantizer; and a quantization selector for selecting a final degree of quantization for use in compression of the current data, the final degree
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: July 2, 2002
    Assignee: Sony United Kingdom Limited
    Inventor: Nicholas Ian Saunders
  • Patent number: 6256070
    Abstract: A video encoding system combines the processing of image data and closed caption data in the formation of a raster television signal. By combining the processing of image data and closed caption data, a single discrete time oscillator (DTO) can be used to generate oscillation signals that are required for each process. In a preferred embodiment, the DTO generates the 500 kHz signal that is used as the “run in” clock for closed caption data, and also generates the subcarrier signal that is used for the modulation of the chrominance components of a composite video signal.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: July 3, 2001
    Assignee: Ati International Srl
    Inventor: Michael Frank
  • Patent number: 6252631
    Abstract: Apparatus for encoding a continuous (i.e. QAM) signal into a (non-continuous) video signal is achieved in a manner to obviate noise problems normally introduced by breaks in the (video) signal due to horizontal and vertical pulses, low fidelity circuits, timing errors and time shifts. The apparatus employs a circular First-In-First-Out buffer with an address counter. The continuous signal is samples and coded on to a active portion of a video line and an address pointer in the address counter is adjusted back a given number of samples at the end of the video line. On the next video line, that (adjusted) number of samples (from the previous line) are output from the buffer before new data is output. By adjusting the number of samples and adding extra samples to the next video line, noise problems are virtually eliminated.
    Type: Grant
    Filed: September 14, 1998
    Date of Patent: June 26, 2001
    Assignee: AdvancedInteractive, Inc.
    Inventor: Karim Lakhani
  • Patent number: 6211919
    Abstract: A method and apparatus for transparently embedding data into a video signal modulates a particular carrier frequency with a randomized pattern representing the data. The randomized pattern may be a combination of the data with the output from a pseudo-random binary sequence generator, or the data may be converted first into a bi-orthogonal pattern selected from among a plurality of such patterns and then randomized. The resulting modulated carrier frequency is then amplitude modulated based upon a human visual model so that the modulated carrier frequency amplitude is greater in areas of high image complexity and lower in areas of low image complexity. The subliminal data represented by the modulated carrier frequency is added to the video signal.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: April 3, 2001
    Assignee: Tektronix, Inc.
    Inventors: Scott E. Zink, Daniel G. Baker
  • Patent number: 6160543
    Abstract: A transmission device for computer video signals. Computer video signals can be inputted into the transmission device for processing and to be transmitted by only three pairs of transmission line (Category 5 UTP) to a remote terminal, while still maintain the function of horizontal and vertical synchronism. The transmission device has a converter for converting the polarity of horizontal synchronous signal (Hsync) and vertical synchronous signal (Vsync) into a state pulse (STATE). The state pulse (STATE), a negative pulse for vertical synchronous signal (V), a negative pulse for horizontal synchronous signal (H) are then carried respectively on the red video signal (R), the green video signal (G), and the blue video signal (B) for transmitting to a receiver in the remote terminal.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: December 12, 2000
    Assignee: Aten International Patent & Trademark Office
    Inventor: Sun-Chung Chen
  • Patent number: 6105032
    Abstract: A method for improving the execution of significant bit scans on a data entity in a computer system is provided. The data entity is examined in a number of iterations equal to the base two logarithm of the size of the data entity in bits, N. Initially, half of the data entity is examined to determine if the significant bit is present. If not, the other half of the data entity is examined. The half within which the significant data entity resides is then iteratively halved and examined in each successive iteration of the method until the number of bits examined is equal to one.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: August 15, 2000
    Assignee: IP-First, L.L.C.
    Inventors: John D Bunda, Arturo Martin-de-Nicolas
  • Patent number: 5946048
    Abstract: A network terminal device utilizes a unique modulation scheme that enables the transmission of digital data over a wireless, cable or direct broadcast satellite TV channel without disturbing quality of television signals. A digital data stream of the network, for example, is transparently transmitted in the television channel in a superfluous sideband segment of the frequency spectrum using a technique, herein called vestigial quadrature modulation (VQM), that entails substituting the vestigial sideband of a conventional television signal with a sideband of a data-encoded signal, preferably being QAM-modulated. A sufficient portion of the television sideband spectrum displaced by the substituted data signal, e.g., to at least the 7.sup.th harmonic, is preserved for deriving sync information that is used both for clocking the digital data from the modulated data signal and for driving vertical and horizontal sync circuits of the television.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: August 31, 1999
    Assignee: Hybrid Networks, Inc.
    Inventor: William C Levan
  • Patent number: 5929920
    Abstract: Digital information is encoded in the video portion of a television signal such that "n" (n is an integer) bits of the digital information are carried by each successive frame in a group of frames. The digital information is encoded by modulating a carrier signal, using, for example, either amplitude shift keying (ASK) or frequency shift keying (FSK), and the modulated carrier is then added to the video signal selectively, only in portions of the television program that (a) are not likely to be perceptible by a viewer, and (b) are of sufficient intensity to transmit the data. The video signal including the encoded digital data, may be transmitted, in real time, to a television receiver, or recorded for later playback.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: July 27, 1999
    Assignee: Lucent Technologies Inc.
    Inventor: Theodore Sizer, II
  • Patent number: 5875005
    Abstract: The method for generating a modulated television signal involves performing a first filtering and a second filtering to obtain two signals, one having a passband that is equal to complete passband and the other one having a passband that is equal to the sideband to be suppressed. The signal having a complete passband is amplitude-modulated with a video carrier, obtaining a first signal. The signal having a passband equal to the sideband to be suppressed is then divided into a first component and a second component, and the first component is phase-shifting by 90.degree. with respect to the second component. The first component is modulated with a video carrier that is phase shifted by 90.degree., obtaining a second signal. The second component of the signal having a passband equal to the sideband to be suppressed is modulated with the video carrier, obtaining a third signal. The second and third signals are then subjected to an algebraic sum, obtaining a fourth signal.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: February 23, 1999
    Assignee: M.B. International S.r.l.
    Inventor: Michele Bargauan
  • Patent number: 5663766
    Abstract: Digital information is encoded in the video portion of a television signal such that "n" (n is an integer) bits of the digital information are carried by each successive frame in a group of frames. The digital information is encoded by modulating a carrier signal, using, for example, either amplitude shift keying (ASK) or frequency shift keying (FSK), and the modulated carrier is then added to the video signal selectively, only in portions of the television program that (a) are not likely to be perceptible by a viewer, and (b) are of sufficient intensity to transmit the data. The video signal including the encoded digital data, may be transmitted, in real time, to a television receiver, or recorded for later playback.
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: September 2, 1997
    Assignee: Lucent Technologies Inc.
    Inventor: Theodore Sizer, II
  • Patent number: 5659372
    Abstract: A tuner selects one of channels at different locations in a frequency band used for transmitting VSB HDTV signals including symbol codes descriptive of digital signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate-frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherence in local oscillations used during frequency conversion(s).
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: August 19, 1997
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: C. B. Patel, Allen LeRoy Limberg
  • Patent number: 5646698
    Abstract: BPSK modulation of suppressed carrier in quadrature with a video carrier amplitude-modulated by composite video signal is used for transmitting a serial-bit digital signal, which is subjected both to "pre-line-comb" and "pre-frame-comb" partial-response filtering prior to conversion to BPSK modulating signal. The "pre-frame-comb" partial-response filtering of the serial-bit data is done on a continuous basis, rather than transmitting frames of the BPSK twice, once in positive logic and once in negative logic, during successive pairs of consecutive frames of the NTSC television signal. This results in the full luminance bandwidth below chroma frequencies being available on average for the transmission of BPSK, rather than half that bandwidth.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: July 8, 1997
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jian Yang, Allen LeRoy Limberg
  • Patent number: 5565930
    Abstract: Digital signal receivers for detecting BPSK modulation of a suppressed carrier transmitted through the same channel as an analog television signal are described, in which the detected BPSK is digitized with an oversampling analog-to-digital converter prior to digital comb filtering for separating the BPSK from interfering analog television signal remnants. This is done to get an increased number of bits resolution from a relatively inexpensive flash converter so that the BPSK, which is of relatively low amplitude compared to maximally interfering analog television signal remnants, is not overwhelmed by quantizing noise. The oversampling analog-to-digital converter can be of sigma-delta type.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 15, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Thomas V. Bolger, Jiang Yang, Allen L. Limberg
  • Patent number: 5563664
    Abstract: BPSK modulation of suppressed carrier in quadrature with a video carrier amplitude-modulated by composite video signal is used for transmitting a serial-bit digital signal, which is subjected both to "pre-line-comb" and "pre-frame-comb" partial-response filtering prior to conversion to BPSK modulating signal. The "pre-frame-comb" partial-response filtering of the serial-bit data is done on a continuous basis, rather than transmitting frames of the BPSK twice, once in positive logic and once in negative logic, during successive pairs of consecutive frames of the NTSC television signal. This results in the full luminance bandwidth below chroma frequencies being available on average for the transmission of BPSK, rather than half that bandwidth.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: October 8, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jian Yang, Allen L. Limberg
  • Patent number: 5534933
    Abstract: A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPSK) signal encoding digital signals. The quadrature transmission reduces the visibility of the lower-frequency PSK sidebands in the TV signal as viewed on screen. The symbol rate of the PSK is made to be a multiple of the horizontal line scan rate of video signal. To reduce the visibility of the higher-frequency PSK sidebands in the TV signal as viewed on screen, the BPSK is transmitted twice during respective frames of successive pairs of data frames, which data frames recur at the same rate as video frames. To reduce the interference of video with the PSK, the PSK is subjected to partial-response filtering at the transmitter and is highpass line-comb filtered at the digital signal receiver.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: July 9, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jian Yang
  • Patent number: 5526062
    Abstract: In a television system including a source of an intermediate frequency (IF) signal, which signal includes an IF picture carrier amplitude modulated with video information, synchronous demodulator means responds to the IF signal, for providing an in-phase first output video signal that has both luminance and chrominance components, and for providing a quadrature-phase second output video signal that has a chrominance component but substantially no luminance component. Chroma circuitry is responsive to the quadrature-phase second output video signal for generating first and second color-difference signals.
    Type: Grant
    Filed: June 29, 1995
    Date of Patent: June 11, 1996
    Assignee: Samsung Electronics, Co., Ltd.
    Inventor: Jack R. Harford
  • Patent number: 5508748
    Abstract: A system for determining the data bits represented by the received symbols of one or more data constellations includes converting the received symbols into multi-bit values (preferably in two's complement form), selecting a number of the most significant bits of each of the multi-bit values and inverting the most significant bit thereof to derive the data bits represented by the respective symbol.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: April 16, 1996
    Assignee: Zenith Electronics Corporation
    Inventors: Gopalan Krishnamurthy, Timothy G. Laud
  • Patent number: 5497205
    Abstract: A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPSK) signal encoding digital signals. The quadrature transmission reduces the visibility of the lower-frequency PSK sidebands in the TV signal as viewed on screen. The symbol rate of the PSK is made to be a multiple of the horizontal line scan rate of video signal. To reduce the visibility of the higher-frequency PSK sidebands in the TV signal as viewed on screen, the BPSK is transmitted twice during respective frames of successive pairs of data frames, which data frames recur at the same rate as video frames. To reduce the interference of video with the BPSK, the BPSK is comb filtered at the digital signal receiver and after symbol detection is subjected to partial-response filtering for recovering the digital signal originally encoded in the BPSK signal.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: March 5, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jian Yang, Allen L. Limberg
  • Patent number: 5461426
    Abstract: A relatively low power phase-shift-keyed (PSK) subcarrier encoding digital information is admixed with composite video signal. The PSK subcarrier is at an odd multiple of half the scan line frequency of the composite video signal, and the symbol rate is at a multiple of the scan line frequency. The PSK subcarrier modulates the amplitude of a suppressed carrier which is the same frequency as the video carrier for the composite video signal and preferably is in quadrature phasing therewith. To reduce evidence of the PSK subcarrier in television picture generated from that composite video signal, the PSK subcarrier is interrupted after each of periods of one frame duration and repeated in anti-phase during the next period of one frame duration. This also provides a basis for separating the PSK subcarrier from static luminance signal components by bandpass frame-comb filtering.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: October 24, 1995
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Allen L. Limberg, Chandrakant B. Patel, Tianmin Liu
  • Patent number: 5448299
    Abstract: A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPSK) signal encoding digital signals. The quadrature transmission reduces the visibility of the lower-frequency PSK sidebands in the TV signal as viewed on screen. The symbol rate of the PSK is made to be a multiple of the horizontal line scan rate of video signal. To reduce the visibility of the higher-frequency PSK sidebands in the TV signal as viewed on screen, the BPSK is transmitted twice during respective frames of successive pairs of data frames, which data frames recur at the same rate as video frames. To reduce the interference of video with the BPSK, the BPSK is comb filtered at the digital signal receiver and after symbol detection is subjected to partial-response filtering for recovering the digital signal originally encoded in the BPSK signal.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: September 5, 1995
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jian Yang, Allen L. Limberg
  • Patent number: 5430487
    Abstract: A system for improving motion-sensitive processing in a television receiver generates motion vectors for video images in a studio environment, encodes the motion vectors and then combines the encoded motion vectors with the video signal for transmission. A receiver decodes the motion vectors and applies them to the motion-sensitive processing apparatus to improve its performance. The motion vector information is encoded during the active portion of the video signal in a manner that does not produce significant distortion when the video signal is processed for display. According to one embodiment of the invention, the motion vectors are encoded in a band of frequencies surrounding the color subcarrier signal as a 16 quadrature amplitude modulated (QAM) signal using Fukinuki-type modulation.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: July 4, 1995
    Assignee: Matsushita Electric Corporation of America
    Inventor: Saiprasad V. Naimpally
  • Patent number: 5315619
    Abstract: A television receiver responds to a quadrature amplitude modulated (QAM) signal containing symbols mapped into a four quadrant grid-like constellation defined by I and Q axes. Demodulated I and Q components are processed by a carrier recovery network which adjusts the parameters of a locally generated carrier reference signal so as to maintain a desired orientation of the QAM constellation. The carrier recovery network includes a time multiplexed processor, including a signal multiplier, exhibiting plural operating modes in a digital phase locked loop exhibiting a loop delay of one symbol period.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: May 24, 1994
    Assignee: RCA Thomson Licensing Corporation
    Inventor: Bhavesh B. Bhatt
  • Patent number: RE41835
    Abstract: The present invention relates to an image processing technique, and in particular to a method for restoring a compressed image by using a hybrid motion compensation discrete cosine transform (hybrid MC/DCT) mechanism, including: a step of defining a smoothing functional having a smoothing degree of an image and reliability for an original image by pixels having an identical property in image block units; and a step of computing a restored image by performing a gradient operation on the smoothing functional in regard to the original image, thereby preventing the blocking artifacts and the ringing effects in regard to the pixels having an identical property in image blocks. In one embodiment, the method includes obtaining a pixel value in a current block and at least one adjacent pixel value, obtaining a difference value between the pixel value in the current block and the adjacent pixel value, and obtaining a smoothing value of the current image based on the difference value.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: October 19, 2010
    Assignee: LG Electronics, Inc.
    Inventor: Min-Cheol Hong