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:
May. 09, 2006
Filed:
Apr. 23, 2003
David G. Welkie, Branford, CT (US);
Craig M. Whitehouse, Branford, CT (US);
David G. Welkie, Branford, CT (US);
Craig M. Whitehouse, Branford, CT (US);
Analytica of Branford, Inc., Branford, CT (US);
Abstract
Apparatus and methods are provided for reducing coherent noise in measurements of repetitive analog signal waveforms by digital signal averagers. Coherent noise is repetitive and synchronous with the signal waveform and is therefore undiminished by conventional signal averaging techniques. A major source of coherent noise is the repetitive voltage transitions that occur within the digital signal averager itself. The apparatus and methods of the present invention introduce a known and variable phase offset during the signal averaging process between the signal waveform being measured and the internally generated coherent noise, thereby allowing such coherent noise to be averaged, and therefore reduced, during the signal averaging process. Consequently, the apparatus and methods of the present invention allow greater signal-to-noise ratio and signal dynamic range than with the prior art.