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A time-domain adaptive windowing fetal heart sound noise reduction technology

An adaptive, fetal heart sound technology, applied in applications, pulse rate/heart rate measurement, biometric identification mode based on physiological signals, etc., can solve the problems of intermittent heart rate curve, unable to filter noise, unable to calculate heart rate value, etc. Achieve the effect of improving signal-to-noise ratio and continuous heart rate curve

Active Publication Date: 2020-07-17
SUZHOU MODOO MEDICAL TECH CO LTD
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Problems solved by technology

In the process of realizing the present invention, the applicant found that the conventional frequency-domain filtering method can filter the noise interference in the non-fetal heart audio frequency band, and improve the signal-to-noise ratio to a certain extent, but cannot filter out the noise in the same frequency band as the fetal heart sound signal , when the noise interference in the same frequency band is very serious, the heart rate value cannot be calculated, resulting in intermittent heart rate curves

Method used

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  • A time-domain adaptive windowing fetal heart sound noise reduction technology
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  • A time-domain adaptive windowing fetal heart sound noise reduction technology

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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...

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Abstract

The invention provides a time domain self-adaptive windowing fetal heart sound noise reduction technology. By adaptively windowing the envelope of fetal heart sound data, this technology retains useful fetal heart sound signals on the envelope and eliminates most of the interference signals. This technology can suppress the noise in the same frequency band as the heart sound signal, improve the signal-to-noise ratio, and can compensate the submerged weak heart sound signal under the background of strong noise. When the heart rate curve is intermittent due to noise interference, this noise reduction technology can make the heart rate curve more continuous.

Description

technical field [0001] The invention relates to the field of audio signal processing, in particular to a time domain noise reduction technology for weak fetal heart sounds. Background technique [0002] Fetal heart rate is an important indicator of fetal health monitoring. The fetal heart rate curve intuitively shows the fetal heart function and is closely related to the fetal oxygen supply status and umbilical cord winding. At present, the most conventional fetal heart rate detection method is to use an ultrasonic fetal heart rate device, which actively emits ultrasound to act on the fetal heart, and uses the Doppler effect of ultrasound to calculate the fetal heart rate through signal processing. There is a problem with the safe dosage of ultrasound. It is not recommended to use high-frequency and long-term ultrasound fetal heart rate monitors in medicine, which makes it impossible for pregnant women to monitor the health of the fetus at any time. In response to this prob...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/024A61B5/00G06K9/40
CPCA61B5/02411A61B5/4362A61B5/7203A61B5/725G06V40/10G06V40/15G06V10/30
Inventor 周营饶丽婷
Owner SUZHOU MODOO MEDICAL TECH CO LTD
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