Patents by Inventor Andrew C. Chang

Andrew C. Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090245520
    Abstract: An digital content protection method and device are disclosed. In the method, digital content to be delivered from a content provider to a consumer terminal is retrieved. The digital content is encoded to prevent unauthorized playback. The encoded digital content and a key for decoding the content are separately transmitted from the content provider to the consumer terminal, playback of the encoded digital content requires decoding with the key.
    Type: Application
    Filed: March 27, 2008
    Publication date: October 1, 2009
    Applicant: MEDIATEK INC.
    Inventors: Andrew C. Chang, Ing-Shry Kuo
  • Patent number: 7193944
    Abstract: The present invention relates to an information recording method to write a digital information file onto an information recording medium. The digital information file comprises a plurality of digital data and the information recording medium comprises a plurality of predetermined recording units which are arranged sequentially on said information recording medium from an inner area to an outer area in order to write the plurality of digital data on the digital information file. The inner area of the information recording medium has a data recording start area, and the data recording start area comprises a first start recording unit, where recording the plurality of digital data of digital information file supposed to start. This information recording method is starting from said first start recording unit to derive a second start recording unit through a predetermined counting procedure.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: March 20, 2007
    Assignee: MediaTek Inc.
    Inventor: Andrew C. Chang
  • Publication number: 20040042362
    Abstract: The present invention relates to an information recording method to write a digital information file onto an information recording medium. The digital information file comprises a plurality of digital data and the information recording medium comprises a plurality of predetermined recording units which are arranged sequentially on said information recording medium from an inner area to an outer area in order to write the plurality of digital data on the digital information file. The inner area of the information recording medium has a data recording start area, and the data recording start area comprises a first start recording unit, where recording the plurality of digital data of digital information file supposed to start. This information recording method is starting from said first start recording unit to derive a second start recording unit through a predetermined counting procedure.
    Type: Application
    Filed: July 2, 2003
    Publication date: March 4, 2004
    Applicant: MediaTek Inc.
    Inventor: Andrew C. Chang
  • Publication number: 20040042376
    Abstract: This invention provides an information recording method to record a digital information file onto an information recording medium. The digital information file comprises a plurality of digital data. The information recording medium comprises a plurality of predetermined recording units which are arranged sequentially on the information recording medium from a inner area to an outer area in order to record the plurality of digital data in the digital information file. The outer area of the information recording medium has a recording start unit, the information recording method starts recording from the recording start unit to sequentially record the plurality of digital data in the digital information file on the information recording medium from outer to inner.
    Type: Application
    Filed: July 2, 2003
    Publication date: March 4, 2004
    Applicant: MediaTek Inc.
    Inventor: Andrew C. Chang
  • Patent number: 6496126
    Abstract: A data slice circuit and the method thereof The data slice circuit comprises a digitizer, a finite state machine, and a digitizer parameter adjustment element. The digitizer receives an analog signal and converts to a digital signal. The finite state machine generates a state signal in response to the digital signal. The digitizer parameter adjustment element generates a parameter adjustment signal in response to the state signal from the finite state machine. The digital signal of the digitizer is adjusted in accordance with the parameter adjustment signal.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: December 17, 2002
    Assignee: Mediatek Inc.
    Inventors: Jing-Hong Conan Zhan, Andrew C. Chang, Chi-Kwong Ho
  • Publication number: 20020067302
    Abstract: A data slice circuit and the method thereof. The data slice circuit comprises a digitizer, a finite state machine, and a digitizer parameter adjustment element. The digitizer receives an analog signal and converts to a digital signal. The finite state machine generates a state signal in response to the digital signal. The digitizer parameter adjustment element generates a parameter adjustment signal in response to the state signal from the finite state machine. The digital signal of the digitizer is adjusted in accordance with the parameter adjustment signal.
    Type: Application
    Filed: October 17, 2001
    Publication date: June 6, 2002
    Inventors: Jing-Hong Conan Zhan, Andrew C. Chang, Chi-Kwong Ho
  • Patent number: 5974088
    Abstract: A digital data slicer which can allow the digital sum value (DSV) of the sliced signal to approach zero is provided. The digital data slicer includes a comparator for comparing the input signal with an analog reference slice level to thereby generate the sliced signal. A DSV calculator is used to obtain the DSV of the sliced signal. A DSV processor is used to compare the DSV with a predefined tolerance window to thereby generate a digital correcting signal. A digital-to-analog (D/A) converter is then used to convert the digital correcting signal into an analog form which either raises or lowers the reference slice level to the comparator. This feedback control goes on until the DSV is within the range defined by the tolerance window.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: October 26, 1999
    Assignee: United Microelectronics Corp.
    Inventor: Andrew C. Chang