The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2007
Filed:
Apr. 08, 2003
James Allen Stephens, Chandler, AZ (US);
David L. Barron, Scottsdale, AZ (US);
Sean S. You, Tempe, AZ (US);
James Allen Stephens, Chandler, AZ (US);
David L. Barron, Scottsdale, AZ (US);
Sean S. You, Tempe, AZ (US);
FreeScale Semiconductor, Inc, Austin, TX (US);
Abstract
A comfort noise generator () suitable for use in a communication system includes a finite impulse response (FIR) filter (), a random number generator (), and a coefficient updater (). The coefficient updater () determines an updated set of filter coefficients () based on the signal frame of the input signal (). The updated set of filter coefficients () is output to the FIR filter (). The FIR filter () shapes a white noise signal () supplied by the random number generator () to provide a simulated background noise signal, or comfort noise signal (). The comfort noise signal () is selectively output from an echo suppression system or corresponding method to overwrite or suppress reflected residual echoes.