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:
Nov. 21, 2006
Filed:
Nov. 14, 2003
Alvin Mark Terry, Longmont, CO (US);
Alvin Mark Terry, Longmont, CO (US);
Datex-Ohmeda, Inc., Madison, WI (US);
Abstract
Processing of plethysmographic signals via the cepstral domain is provided. In one embodiment, a cepstral domain plethysmographic signal processing method () includes the steps of obtaining () time domain plethysmographic signals, smoothing () the time domain plethysmographic signals, performing () a first-stage Fourier transformation of the time domain plethysmographic signals to frequency domain plethysmographic signals, computing () power spectrums from the frequency domain plethysmographic signals, scaling () the power spectrums with a logarithmic function, performing () a second-stage Fourier transformation on log-scaled spectrums to transform the power spectrums into cepstrums, and examining () the cepstrums to obtain information therefrom relating to a physiological condition of the patient such as the patient's pulse rate or SPO2 level.