42 results about "Fetal Heart Tone" patented technology

The invention relates to a method for acquiring fetal heart sound signal envelope. The method comprises the following steps that a fetal heart sound signal is collected, and intervention processing is conducted on the signal; a template signal is acquired, matching filtering is conducted on the fetal heart sound signal after preprocessing by utilizing the template signal, so that a signal-to-noise-ratio wave shape is acquired; non-linear peak enhancement is conducted on the fetal heart sound signal after matching filtering according to slope variation of the signal within two adjacent moments, and the envelope of the fetal heart sound signal after the matching filtering is further acquired. The invention further relates to a device for achieving the method. The method and device for acquiring the fetal heart sound signal envelope has the following advantages of being strong in anti-interference capacity and capable of enabling periodicity of the signal to be more obvious, so that calculation of the following fetal heart rate is facilitated.

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.

The invention discloses a method for reducing noise of fetal heart sound signal based on non-negative matrix decomposition. The existing filtering methods have limitations in improving the signal-to-noise ratio of fetal heart sound signals. The invention performs short-time Fourier transform on the signal to obtain the amplitude information matrix and phase angle information matrix; performs singular value decomposition and non-negative matrix decomposition on the amplitude information matrix, selects useful features according to the characteristic matrix and coefficient matrix, and combines them to obtain The amplitude information matrix after noise reduction; phase compensation is performed on the phase angle information matrix to obtain the compensated phase matrix; short-time Fourier inverse transform is performed on the amplitude information matrix and the compensated phase matrix to obtain the time domain signal. The singular value decomposition method adopted in the present invention avoids the influence of the randomness of the initial value on the matrix iteration result, and the adopted phase compensation method replaces the original band noise signal phase with the compensated phase, which increases the reliability of the phase signal after noise reduction. Reliability, significantly improved the noise reduction effect of fetal heart sound signal.

The invention provides a nonnegative blind source separation fetal heart sound analysis method and device. The method comprises the following steps: 1) collecting fetal heart sound signals; 2) carrying out pretreatment on the collected fetal heart sound signals, and adopting wavelet transform, which not only can effectively remove noise, but also can keep local singularity of the signals, in the pretreatment process; 3) converting the signals obtained after pretreatment to a time-frequency domain to obtain nonnegative frequency spectrum, the adopted method being: carrying out wigner-ville distribution calculating on the signals obtained after pretreatment and carrying out modulus calculating to obtain magnitude spectrum; 4) carrying out blind source separation by utilizing non-negative matrix factorization and carrying out processing on the fetal heart sound signal amplitude spectrum to obtain nonnegative time-frequency component of the fetal heart sound signal; 5) drawing an envelope curve; and 6) analyzing the envelope, setting dual thresholds to realize envelope segmentation and calculating instantaneous heart rate. The analysis method and device are good in flexibility, can segment the fetal heart sound signal accurately, and are high in instantaneous heart rate identification accuracy.

The present invention discloses a method, a system and a device for assistant positioning used for fetal heart sound monitoring. The method comprises the steps of: collecting audio data of two fetal heart sound tracks; marking the two fetal heart sound tracks on corresponding position points of a rectangular region; employing the marked position points to calculate fetal heart sound signal intensities corresponding to all the unknown position points in the rectangular region; and performing rendering according to color to generate a rendering graph according to the fetal heart sound signal intensity corresponding to each position point in the rectangular region. The system comprises a collection unit, a marking unit, a calculation unit and a rendering unit. The device comprises a storage and a processor configured to execute the method for assistant positioning used for fetal heart sound monitoring. According to the invention, the method, the system and the device for assistant positioning used for fetal heart sound monitoring can assist users in rapid and accurate positioning of the optimal monitoring positions, are high in convenience and operation mutual experience, and can be widely applied in the fetal heart sound monitoring field.

The invention discloses a method, device and system for processing fetal heart sound data. The method includes: converting the received ultrasonic echo signal into an electrical signal; preprocessing the electrical signal to obtain a fetal heart sound signal; performing AD sampling on the fetal heart sound signal according to a preset sampling frequency, and converting the AD sampled The data is numbered and cached in the cache module; the data to be sent is read from the cache module according to the preset reading frequency and the first preset rule, and the data to be sent is combined into the data to be sent according to the second preset rule UDP data packet; send the UDP data packet to the wireless player, wherein the wireless player will analyze the received UDP data packet, and arrange the data in the parsed UDP data packet according to the number, and arrange the The data is DA converted to generate an analog signal and played back. Thereby, the real-time performance and continuity of fetal heart sound playback can be guaranteed, and the delay of fetal heart sound playback can be reduced.

According to the embodiment, the invention discloses a fetal heart sound processing method, in order to solve a problem of existing fetal heart sound detection equipment which is difficult in effectively filtering off floor noise of fetal heart sound. According to the embodiment, the method comprises the following steps: acquiring ultrasonic echo signals which are collected when fetal heart soundis detected; processing the ultrasonic echo signals, so that fetal heart sound frequency digital signals are obtained; implementing de-noising treatment on the fetal heart sound frequency digital signals in accordance with a preset de-noising coefficient, so that fetal heart sound frequency signals that floor noise is filtered off are obtained, wherein the de-noising coefficient is confirmed in advance through no-load audio signals which are detected out when fetal heart sound detection equipment is under no-load; and outputting the fetal heart sound signals. According to the embodiment, the invention also provides a fetal heart sound processing device and the fetal heart sound detection equipment.

The invention discloses a fetal heart sound processing method and processing device. The method includes: obtaining fetal heart sound data and noise data; performing empirical mode decomposition on the fetal heart sound data and noise data to obtain the fetal heart sound natural mode component sequence and Noise natural mode component sequence; obtain the processed natural mode component sequence according to the fetal heart sound natural mode component sequence and noise natural mode component sequence; extract the instantaneous value of each processed natural mode component in the processed natural mode component sequence Frequency, and superimpose the processed natural mode components with instantaneous frequency between 20Hz and 200Hz to obtain the combined natural mode components; perform noise reduction processing on the combined natural mode components to obtain heartbeat waveforms, and extract the combined natural mode components The fetal heart rate is obtained from the first heart sound feature and the second heart sound feature, and the present invention can obtain both the fetal heart rate and the heartbeat waveform of the fetus, and the display result is clearer and more intuitive.

The invention discloses a fetal heart sound denoising method, system, device and storage medium, comprising the steps of: converting the acquired fetal heart sound audio signal into a digital signal reconstruction matrix, performing singular value decomposition on the reconstruction matrix and reverse Calculate the original component signal corresponding to each singular value, select the original component signal whose frequency domain signal feature is consistent with the frequency domain signal feature of the fetal heart sound audio signal according to the frequency domain signal feature of the original component signal, and superimpose The fetal heart sound noise reduction signal is obtained after selecting the original component signal. The present invention transforms the selection of the singular value to the frequency domain, selects by comparing the frequency characteristics of the component signal and the fetal heart sound audio signal, and compares and analyzes the frequency domain signal characteristics of the component signal corresponding to the singular value and the fetal heart sound audio signal. The correlation of frequency features is selected, which is more in line with practical applications, so as to obtain more accurate noise reduction signals. The invention can be widely used in the technical field of fetal heart sound processing.

The invention relates to the technical field of medical monitoring, in particular to the technical field of medical fetal monitoring, in particular to a method and a device for improving the quality of fetal heart sound signal collection. The technical solution provided by the present invention uses the judgment of the value of the uterine systolic pressure to identify the ongoing uterine contraction, and uses the method of intelligently controlling the signal gain to offset the weakening of the fetal heart rate and the weakening of the ultrasonic echo signal. Ensure good ultrasound echo signals during uterine contractions, and intelligent control will not cause signal saturation and distortion due to gain changes, so as to obtain good fetal heart sound signals and provide high-quality signals for subsequent processing.