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:
Sep. 06, 1994
Filed:
Mar. 05, 1991
Rex McCarthy, Newbury Park, CA (US);
Robert Smith, Corona, CA (US);
Sensormedics Corp., Yorba Linda, CA (US);
Abstract
A method of energy-reducing waveform shaping of carrier signals in a photoplethysmographic system, in which a carrier signal may comprise a time-varying periodic waveform comprising a sum of carrier components. The carrier signal has its energy reduced by adding additional carrier components, which reduce the energy envelope for a period of the carrier signal, while preserving the signal information. The method of energy-reducing waveform shaping may be coupled with frequency-division, phase-division and component-amplitude-division multiplexing, and more generally with any method of multiplexing which employs a time-varying periodic carrier signal. Redundant information may be used for error detection and correction. A plurality of carrier components may be chosen which reduces the energy envelope for a period of the carrier signal, and which employs more carrier components than needed to perform the preferred form of multiplexing and demultiplexing of the modulation effects introduced by a tissue section of the patient. Majority voting of carrier components may then provide for error detection and correction.