Patents by Inventor David A. C. M. Roovers

David A. C. M. Roovers 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: 8155302
    Abstract: An acoustic echo cancellation device for canceling an echo in a microphone signal in response to first and second input signals includes a first combination unit for combining the first and second input signals into an aggregate input signal. The device further includes an adaptive filter unit for filtering the aggregate input signal so as to produce an aggregate echo cancellation signal. A second combination unit combines the aggregate echo cancellation signal with the microphone signal so as to produce a residual signal, and an additional filter unit filters either the first or second input signal so as to produce a first or a second partial echo cancellation signal. A post-processor unit suppresses remaining echo components in the residual signal. The post-processor unit uses at least one partial echo cancellation signal to suppress echo components corresponding with the first input signal to a greater extent than echo components corresponding with the second input signal.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: April 10, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: David A. C. M. Roovers
  • Publication number: 20080304675
    Abstract: An acoustic echo cancellation device (1) for canceling an echo (e) in a microphone signal (z) in response to a first input signal (s) and a second input signal (m) comprises: —a first combination unit (13) arranged for combining the first input signal (s) with the second input signal (m) into an aggregate input signal (x), —an adaptive filter unit (11) arranged for filtering the aggregate input signal (x) so as to produce an aggregate echo cancellation signal (y), —a second combination unit (14) arranged for combining the aggregate echo cancellation signal (y) with the microphone signal (z) so as to produce a residual signal (r), —an additional filter unit (12) arranged for filtering either the first input signal (s) or the second input signal (m) so as to produce a first partial echo cancellation signal (ys) or a second partial echo cancellation signal (ym) respectively, and—a post-processor unit (15) arranged for suppressing remaining echo components in the residual signal (r).
    Type: Application
    Filed: January 3, 2007
    Publication date: December 11, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventor: David A. C. M. Roovers