Tohoku University

Tohoku Techno Arch Co., Ltd.

Mitsuyuki Nakao

Yoshitaka Kimura

Takuya Ito

Nobuo Yaegashi

Kunihiro Okamura

Shinichi Chida

Miyuki Endo

Hidekazu Nishigori

Yuji Nabeshima

Kazunari Ohwada

Michiyoshi Sato

Naoaki Sato

Takayuki Shimazaki

Junichi Sugawara

Sayaka Oshio

Masato Senoo

A fetal state estimation apparatus estimates a state of a fetus in a maternal body based on a potential signal indicating a change in potential on a surface of the maternal body. The fetal state estimation apparatus is configured to include a rotation angle estimation unit which estimates a rotation angle of the fetus with respect to the maternal body at every beating of a heart of the fetus based on the potential signal and a fetal movement estimation unit which estimates a fetal movement which is a movement of the fetus based on the potential signal and the estimated rotation angle.

Fetal state estimation apparatus, fetal state estimating method, and non-transitory computer-readable medium

A signal extracting apparatus is provided based on independent component analysis with reference for a single measured signal as a signal processing technique that allows stable and quick extraction of a target signal from single measured signal even in a high-noise environment with a high noise ratio against a target signal to be extracted. The signal extracting apparatus includes: a single-signal measuring unit to measure a measured signal as a single time-series signal containing a target signal obtained by measurement by a single channel; a reference signal creating unit () to create a reference signal provided with timing-axis information based on the time-series signal obtained by the single-signal measuring unit; and a main processing unit () to perform independent component analysis with reference for a single measured signal by capturing the reference signal obtained by the reference signal creating unit () and providing the timing-axis information for an algorithm in a reference system to extract an independent component.

Signal extracting apparatus

Disclosed are a fetus electrocardiogram signal measuring method and its device that are capable of measuring the electrocardiogram signals of a fetus even during fetus movements and even at a gestational age during which the measurement current is weak, without the need for reattaching the electrodes and providing any shield room, even if the mother is a hospitalized or ambulant pregnant woman. The fetus electrocardiogram signal measuring device includes (1) high input impedance electrodes, (2) region-variable ground electrodes, and (3) a differential amplifier circuit and an optimization computing section.

Fetus electrocardiogram signal measuring method and its device

An electrocardiogram signal processing method and device for extracting a fetus electrocardiogram signal included in a biopotential signal detected from an electrode attached to a mother's body is provided. The electrocardiogram signal processing method for extracting an electrocardiogram signal of a fetus () from a biopotential signal containing electrocardiogram signals of the mother's body () and a fetus () inputted through an electrode (E) attached to the mother's body () during pregnancy, comprises a reference signal generating stepof generating a reference signal for separating/extracting a fetus electrocardiogram signal of a specified induction type according to a beat rate signal inputted from a sensor (S) for detecting the beat rate of the fetus () and a fetus electrocardiogram signal extracting stepof separating/extracting the fetus electrocardiogram signal of the specified induction type from the biopotential signal inputted through an electrode (E) according to the reference signal generated at reference signal generating stepby a reference system independent component analyzing method.

Electrocardiogram signal-processing method and electrocardiogram signal-processing device

There is provided a non-linear signal separation method using the non-linear state space projection method capable of separating an effective non-linear signal even if the S/N ratio is low by performing the time domain high speed non-linear state space projection when a signal is a multi-channel signal and has a periodicity. In the non-linear signal separation method using the non-linear state space projection method, an original signal having a complex signal which is a multi-channel and cyclic signal measured from one phenomenon is processed by using the time domain high-speed non-linear state space projection method so as to estimate a noise in the original signal and subtract the estimated noise from the original signal, thereby separating the signal to be measured in the original signal as a non-linear signal even when the S/N ratio is low.

Non-linear signal separation method using non-linear state space projection method

Growing community of inventors

Sendai, Japan

Mitsuyuki Nakao