Title:
信号対ノイズ比改善のための信号処理方法及び装置
Document Type and Number:
Japanese Patent JP2005516642
Kind Code:
A
Abstract:
A method and apparatus extract a signal component of a measured signal using one of two methods. If the signal component in the measured signal is a periodic signal with a certain well-defined peak-to-peak intensity value, upper and lower envelopes of the measured signal are determined and analyzed to extract said signal component of the measured signal. This signal component can further be used to calculate a desired parameter of the sample. The DC component of the signal is determined as the median value of the upper envelope, and the AC component is determined as the median value of the difference between the upper and lower envelopes. If the signal component of the measured signal is a periodic signal characterized by a specific asymmetric shape, a specific adaptive filtering is applied to the measured signal, resulting in the enhancement of the signal component relative to a noise component. This adaptive filtering is based on a derivative of the Gaussian Kernel having specific parameters matching the characteristics of the signal component.
Inventors:
Wasselman Yoram
Application Number:
JP2003526274A
Publication Date:
June 09, 2005
Filing Date:
October 15, 2001
Export Citation:
Assignee:
Imagine Medical Technologies California, Inc.
International Classes:
A61B5/145; A61B5/04; A61B5/053; A61B5/1455; A61B5/00; (IPC1-7): A61B5/145
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima