Patents by Inventor Ronald Alspaugh

Ronald Alspaugh 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).

  • Sampling rate conversion using polyphase filters with interpolation
    Patent number: 5274372
    Abstract: A sampling rate converter for converting an input digital signal, such as D2 PAL, into an output digital signal, such as D1 PAL, has a pair of polyphase filters. The input digital signal is input in parallel to the two polyphase filters, with the phase selected by one of the filters being offset by one from that of the other. The outputs of the polyphase filters are input to a linear interpolator to produce the output digital signal. The resolution of the sampling rate conversion is a function of the number of phases N of the polyphase filters and the number of interpolation steps M of the interpolator.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: December 28, 1993
    Assignees: Tektronix, Inc., The Grass Valley Group, Inc.
    Inventors: Ajay K. Luthra, Ganesh Rajan, Ronald Alspaugh