Patents by Inventor Joseph H. Rothweiler

Joseph H. Rothweiler 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).

  • System for digital multiband filtering
    Patent number: 4691292
    Abstract: A digital filter system in which the frequency spectrum of an input signal is divided into M consecutive subbands. Each subband is generated by multiplying the impulse reponse of a low pass filter by a sinusoid (sine or cosine) whose frequency is equal to the center frequency of its respective subband. The sinusoids of adjacent bands are phase shifted by 90.degree. relative to each other to establish a condition enabling aliasing components to be cancelled when the subbands are recombined.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: September 1, 1987
    Assignee: RCA Corporation
    Inventor: Joseph H. Rothweiler