Chrominance Phase Adjuster (e.g., Inverter) Patents (Class 348/662)
  • Patent number: 9001275
    Abstract: HDMI is a digital audio and video communications protocol commonly used in consumer electronics. HDMI is particularly synonymous with high fidelity audio and video. Even though HDMI is a digital communications protocol, the audio quality can be impaired by analog signal impairments and distortions even if there are no digital decoding errors. In particular, the very process by which the audio is converted from Digital (HDMI) to human audible “Analog Audio” can be prone to errors. This occurs when the Digital to Analog Converter (DAC) clock, which is derived from the HDMI TMDS clock or HDMI source, is “distorted” due to its jitter, resulting in erroneous sampling or outputting of vital audio samples, thereby reducing the audio quality of the experience. The present invention reduces the jitter on the TMDS clock, and hence the audio DAC clock, resulting in lower audio distortion.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: April 7, 2015
    Inventors: Andrew Joo Kim, David Anthony Stelliga
  • Patent number: 8675982
    Abstract: An image processing method for removing a noise component contained in an original image, includes: separating an original image into a temporary noise-free image and a temporary noise component; extracting an edge component in the temporary noise-free image by executing edge detection on the temporary noise-free image; determining a fine edge component in the original image contained in the temporary noise component based upon a level of the extracted edge component; extracting an actual noise component by excluding the fine edge component from the temporary noise component; and removing noise from the original image based upon the extracted actual noise component.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: March 18, 2014
    Assignee: Nikon Corporation
    Inventor: Kenichi Ishiga
  • Publication number: 20100231799
    Abstract: A method for reducing color noises of a chrominance signal includes the following steps: receiving the chrominance signal; sampling the chrominance signal to generate a plurality of chrominance samples; determining a phase-rotation level between a specific chrominance sample and the chrominance samples; calculating an average value of the chrominance samples; and selectively outputting the average value or the chrominance information of the specific chrominance sample as an output chrominance information to represent the color information of the specific chrominance sample according to the phase-rotation level.
    Type: Application
    Filed: March 10, 2009
    Publication date: September 16, 2010
    Applicant: MEDIATEK, INC.
    Inventors: Min-Yu Lin, I-Hong Chen, Chung-Yen Lu
  • Patent number: 7643681
    Abstract: Color correction is performed on a first set of three pixel values by determining a color phase of the pixel values. The determined color phase is used to determine a phase difference, and the phase difference is used to control an amount of color phase rotation applied to the chrominance pixel values of the first set. The color phase is also used to determine a first gain, and the first gain is used to control a scaling of the rotated chrominance pixel values, thereby generating color corrected chrominance pixel values. The color phase is also used to determine a second gain, and the second gain is used to control an amount of scaling applied to the luminance pixel value of the first set, thereby generating the color corrected luminance pixel value. How color phase determines phase difference, the first gain and the second gain is changed depending on lighting conditions.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: January 5, 2010
    Assignee: Media Tek USA Inc
    Inventors: Youichi Nakasone, Toshihiro Sasai
  • Patent number: 7277134
    Abstract: An NTSC system chrominance signal demodulation apparatus is provided with a clock timing change circuit for burst-locking an input signal under the state where the phase is shifted by 90 degrees for every line, and phase axis rotation circuits for performing phase axis rotation, thereby to enable conversion of the phase axis of the burst signal. Therefore, demodulation of a PAL system chrominance signal can be carried out as well as demodulation of an NTSC system chrominance signal, and thereby demodulation of chrominance signals can be carried out using a common device regardless of the broadcast systems such as NTSC and PAL. Further, demodulation of chrominance signals can be carried out even under adverse conditions such as weak electric field or level compression of the burst signal.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: October 2, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshihiro Matsumura, Kazuya Miyashita
  • Patent number: 6690430
    Abstract: A chrominance signal demodulation circuit capable of precisely processing a chrominance signal demodulation even when a phase of an inputted chrominance signal is abruptly changed due to a tape track skew error. A first and second color difference signals in an R-Y axis and B-Y axis directions are obtained by multiplying a color burst signal of the inputted chrominance signal and color subcarrier signals generated by a color subcarrier generator. A demodulation phase detector 17 generates a phase error signal to compensate a phase difference between the phases of the color burst signal and the color subcarrier signal based on the first and second color difference signals obtained. The color subcarrier generator 12 generates color subcarrier signals compensated responsive to the phase error signal. Thereby, a chrominance information portion following to the color burst signal in the inputted chrominance signal is successively processed with a chrominance signal demodulation with a correct phase.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: February 10, 2004
    Assignee: JVC Victor Company & Japan, Ltd.
    Inventor: Hiroshi Takeshita
  • Patent number: 6327005
    Abstract: A digital TV display device and method is disclosed including a display control unit providing selection signals, a look-up table unit having at least two look-up tables wherein at least one of the look-up tables is operative in a read mode and the other is operative in a write mode in response to the selection signals, and a look-up table selection unit forwarding a data read from the at least one look-up table operative in the read mode in response to the selection signals for displaying.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: December 4, 2001
    Assignee: LG Electronics Inc.
    Inventor: Dongil Han
  • Patent number: 5995164
    Abstract: In a video encoder, the color distortion between pixels can be reduced by encoding the hue transition to limit very large hue (phase) transitions and encode a corresponding smaller phase transition. This produces fewer spurious colors between pixels during the encoding. This can be done by comparing the change in hue value to a reference value and adding or subtracting 2 .pi. to this reference value to reduce the absolute value of a modified delta hue signal.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: November 30, 1999
    Assignee: Zilog, Incorporated
    Inventor: Anatoliy V. Tsyrganovich
  • Patent number: 5404180
    Abstract: A waveform shaping apparatus in which no unrequired waveform shaping operation is performed even if its sensitivity is enhanced is provided. A signal (A) to be shaped in waveform is delayed by delay circuits (1 and 2) to produce signals (B and C). The signals (A, B and C) are applied to an original correction signal generating means (200a) and a control signal generating means (100a) to produce original correction signals (Ka and Kb), and control signals (Ha and Hb), respectively. A control circuit (13) selects the original correction signals (Ka and Kb), or a value "0" in accordance with the control signals (Ha and Hb) to generate a quasi-correction signal (L). The signal (L) is multiplied by a specified coefficient in a coefficient multiplier (14) to produce a correction signal (M), and the correction signal (M) is added to the signal (B) in an adder (5) to obtain an output signal (N) which has been shaped in waveform.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: April 4, 1995
    Assignees: Mitsubishi Electric Engineering Company Limited, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tooru Kitano, Tsutomu Kawano