Patents by Inventor Thomas C. Butash

Thomas C. Butash 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).

  • Patent number: 6990060
    Abstract: A system and method for demultiplexing an RF signal including nested frequency division multiplexed (FDM) channels is disclosed. The system can demultiplex an RF signal including at least two nested sets of FDM channels extending over a bandwidth B.
    Type: Grant
    Filed: February 12, 2001
    Date of Patent: January 24, 2006
    Assignee: BAE Systems
    Inventor: Thomas C. Butash
  • Patent number: 6351451
    Abstract: A computationally efficient digital signal processing (DSP) system is provided for multiplexing/demultiplexing a large number of closely spaced FDM channels. Sub-band definition filtering divides the FDM channel band, comprised of N channels into K sub-bands, in order to reduce the dimension of polyphase filter fast-Fourier transform for completing the multiplexing/demultiplexing. This reduces the order of the required prototype by a factor proportional to K and allows small size, lightweight DSP implementations.
    Type: Grant
    Filed: July 25, 2000
    Date of Patent: February 26, 2002
    Assignee: BAE Systems Information and Electronic Systems Integration, Inc.
    Inventor: Thomas C. Butash
  • Publication number: 20010036152
    Abstract: A system and method for demultiplexing an RF signal including nested frequency division multiplexed (FDM) channels is disclosed. The system can demultiplex an RF signal including at least two nested sets of FDM channels extending over a bandwidth B.
    Type: Application
    Filed: February 12, 2001
    Publication date: November 1, 2001
    Inventor: Thomas C. Butash
  • Patent number: 6091704
    Abstract: A digital signal processing system for multiplexing/demultiplexing a large number of closely spaced FDM channels in which sub-band definition filtering divides the FDM spectral band comprised of "N" channels into "K" sub-bands in order to reduce the dimension of the polyphase filter fast Fourier transform structure required to complete the multiplexing/demultiplexing. This reduces the order of the required prototype filter by a factor proportional to K. The number of sub-bands K is chosen so that it is large enough to ensure the polyphase filter, fast Fourier transform structure for each sub-band is realizable within a finite word length, fixed point arithmetic implementation compatible with a low power consumption. To facilitate efficient sub-band definition filtering, the real basebanded composite signal is inputted at a spectral offset from DC equal to one quarter the FDM channel bandwidth for the N channels and the signal is sampled at a frequency 50% greater than the applicable Nyquist rate.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: July 18, 2000
    Assignee: Lockheed Martin Corporation
    Inventor: Thomas C. Butash
  • Patent number: 5867479
    Abstract: A digital signal processing system for multiplexing/demultiplexing a large number of closely spaced FDM channels in which sub-band definition filtering divides the FDM spectral band comprised of "N" channels into "K" sub-bands in order to reduce the dimension of the polyphase filter fast Fourier transform structure required to complete the multiplexing/demultiplexing. This reduces the order of the required prototype filter by a factor proportional to K. The number of sub-bands K is chosen so that it is large enough to ensure the polyphase filter, fast Fourier transform structure for each sub-band is realizable within a finite word length, fixed point arithmetic implementation compatible with a low power consumption. To facilitate efficient sub-band definition filtering, the real basebanded composite signal is inputted at a spectral offset from DC equal to one quarter the FDM channel bandwidth for the N channels and the signal is sampled at a frequency 50% greater than the applicable Nyquist rate.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: February 2, 1999
    Assignee: Lockheed Martin Corporation
    Inventor: Thomas C. Butash