Patents by Inventor Arif Kareem

Arif Kareem 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).

  • Waveform timing alignment system for digital oscilloscopes
    Patent number: 4843309
    Abstract: A method and an apparatus detect the presence of and correct for timing misalignment between waveforms acquired by digital oscilloscopes. In a preferred embodiment, a digital oscilloscope (50) includes a waveform alignment system (60) that receives a first waveform (86) and a similar second waveform (88) of a periodic electrical signal. A digital signal processor (80) of the waveform alignment system generates an autocorrelation value in connection with the first waveform and a first cross-correlation value in connection with the first and second waveforms and compares the values to determine whether they differ by more than a preselected tolerance, thereby to detect a timing misalignment between the first and second waveforms.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: June 27, 1989
    Assignee: Tektronix, Inc.
    Inventors: Arif Kareem, George S. Walker, Daniel G. Knierim