Patents by Inventor Russell Siggelkoe

Russell Siggelkoe 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).

  • Multiple clock signal generator apparatus
    Patent number: 5266908
    Abstract: A digital-to-analog converter--preamplifier apparatus serving as an interface between a source of digital audio signal data and an amplifier is disclosed. A digital stage receives multiple digital audio signal inputs, a selected one of which is analyzed by a digital audio interface receiver, processed by a digital signal processing device and a delta-sigma modulator prior to passing to the analog stage for conversion from the digital domain into left and right channel analog audio output signals. Volume control is performed on the audio signal in both the digital domain and the analog domain in order to optimize performance and minimize noise. The present invention automatically adjust for input word lengths of greater than 18-bits.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: November 30, 1993
    Assignee: Vimak Corporation
    Inventors: Michael A. Koulopoulos, Russell A. Siggelkoe, Thomas R. Hegg
  • Digital-to-analog converter--preamplifier apparatus
    Patent number: 5243344
    Abstract: A digital-to-analog converter--preamplifier apparatus serving as an interface between a source of digital audio signal data and an amplifier is disclosed. A digital stage receives multiple digital audio signal inputs, a selected one of which is analyzed by a digital audio interface receiver, processed by a digital signal processing device and a delta-sigma modulator prior to passing to the analog stage for conversion from the digital domain into left and right channel analog audio output signals. Volume control is performed on the audio signal in both the digital domain and the analog domain in order to optimize performance and minimize noise. The present invention automatically adjust for input word lengths of greater than 18-bits.
    Type: Grant
    Filed: May 30, 1991
    Date of Patent: September 7, 1993
    Inventors: Michael A. Koulopoulos, Russell A. Siggelkoe, Thomas R. Hegg
  • Directional microphone
    Patent number: D389839
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: January 27, 1998
    Assignee: PictureTel Corporation
    Inventors: Edward C. Woodman, Steven L. Potts, Adam Reed, Russell Siggelkoe, Hong Wang