CN106798553A - A kind of fetal heart sound noise-reduction method of time-domain adaptive adding window - Google Patents

A kind of fetal heart sound noise-reduction method of time-domain adaptive adding window Download PDF

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CN106798553A
CN106798553A CN201710074942.8A CN201710074942A CN106798553A CN 106798553 A CN106798553 A CN 106798553A CN 201710074942 A CN201710074942 A CN 201710074942A CN 106798553 A CN106798553 A CN 106798553A
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fetal heart
heart rate
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CN106798553B (en
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周营
饶丽婷
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Suzhou Budding Medical Technology Co Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02411—Detecting, measuring or recording pulse rate or heart rate of foetuses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/43—Detecting, measuring or recording for evaluating the reproductive systems
    • A61B5/4306—Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
    • A61B5/4343—Pregnancy and labour monitoring, e.g. for labour onset detection
    • A61B5/4362—Assessing foetal parameters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/30—Noise filtering
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/15—Biometric patterns based on physiological signals, e.g. heartbeat, blood flow

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Heart & Thoracic Surgery (AREA)
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  • Biophysics (AREA)
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  • Ultra Sonic Daignosis Equipment (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

The invention provides a kind of fetal heart sound noise-reduction method of time-domain adaptive adding window.The method carries out self adaptation adding window by the envelope to fetal heart sound data, remains useful fetal heart sound signal on envelope, eliminates most of interference signal.The method can suppress the noise with frequency band with cardiechema signals, improve signal to noise ratio, and can compensate for the faint cardiechema signals being submerged under strong noise background.When noise jamming causes heart rate curve interrupted, the noise-reduction method can make heart rate curve more continuous.

Description

A kind of fetal heart sound noise-reduction method of time-domain adaptive adding window
Technical field
The present invention relates to Audio Signal Processing field, more particularly to a kind of time domain noise reduction method for faint fetal heart sound.
Background technology
Fetal Heart Rate is the important indicator of foetus health monitoring, and fetal heart rate curve intuitively shows the cardiac function of fetus, And it is closely related with the information such as the oxygen supply situation and umbilical cord-wrapping of fetus.At present, most conventional Fetal Heart Rate detection method is to adopt Ultrasonic wave fetus-voice meter, ultrasonic wave fetus-voice meter is used actively to launch ul-trasonic irradiation in heart of fetus, imitated using the Doppler of ultrasonic wave Should, calculate Fetal Heart Rate by signal transacting.There is safe dose in ultrasonic wave, medically it is not recommended that high-frequency, long-time Ground uses ultrasonic wave fetus-voice meter, and this causes the pregnant woman cannot at any time to monitor the health status of fetus.It is more preferable for this problem Foetus health monitoring tool be the testing equipment that fetal heart sound is collected using passive type, this testing equipment do not launch ultrasonic wave, Passive type receives the heartbeat acoustical signal of fetus, all fool proof to fetus and pregnant woman, can continuously use for a long time.Passive type fetal rhythm Sound testing equipment uses highly sensitive acoustical signal acquisition module, and fetal heart sound is gathered in her abdominal, then makees letter to fetal heart sound Number treatment, calculate Fetal Heart Rate simultaneously draw curve map.
Fetal heart sound is a kind of faint low-frequency acoustic signal, is easily disturbed by noise in ambient noise, parent etc., the fetal rhythm of collection Inevitably contain various low frequency noises in sound data, serious noise jamming can influence the calculating of heart rate value.In reality During now of the invention, it is found by the applicant that the frequency domain filtering method of routine can filter the noise jamming of non-fetal rhythm audio section, Signal to noise ratio is improved to a certain extent, the noise with fetal heart sound signal with frequency range cannot be but filtered, and disturbs very serious with band noise When, it is impossible to heart rate value is calculated, causes heart rate curve intermittent.Now need one kind to filter to be made an uproar with frequency range with cardiechema signals The method of sound, further improves signal to noise ratio, improves the intermittent phenomenon of fetal heart rate curve.
The content of the invention
(1) technical problem to be solved
In view of above-mentioned technical problem, the invention provides a kind of fetal heart sound noise-reduction method of time-domain adaptive adding window, with reality Now improve signal to noise ratio and improve the effect of the intermittent phenomenon of fetal heart rate curve.
(2) technical scheme
A kind of fetal heart sound noise-reduction method of time-domain adaptive adding window of the present invention includes：Step A, to i-th second original fetal heart sound Data diN () is filtered, filter the interference signal outside fetal rhythm audio section, obtains fetal heart sound filtering data fi(n), wherein, n= 1,2 ..., IV, IV is 1 second total sampling number；Step B, to filtering data fiN () takes envelope, obtain envelope data ei(n)；Step C, determines whether to open time-domain adaptive adding window according to preceding M seconds Fetal Heart Rate, if opening adding window, into step D, if being not turned on adding Window, then skip to step E；Step D, time-domain adaptive adding window is specifically included：
Sub-step D1：According to Fetal Heart Rate value upper 1 second, the reference spacing L and spacing between current 1 second two rectangular window are generated Variation length dHAnd dL；
Sub-step D2：It is the rectangular window of w to set width, is moved on the envelope of current 1 second, and moving step length is v, calculates every Individual original position is lkThe gross energy p of envelope in place's rectangular windowk, wherein, k=1,2 ..., K, K count for total position；
Sub-step D3：Current 1 second envelope data is divided into Q sections, from pkIn find out every section in Energy maximum value pqAnd its phase Answer position lq, q=1,2 ..., Q；
Sub-step D4：From Q sections of maximum pqIn find out two maximum p for meeting conditionmax1And pmax2, it is recorded successively Position lmax1And lmax2；
Sub-step D5：With lmax1And lmax2It is the starting point of adding window, degree of widening is the rectangular window of w on envelope respectively, will be [lmax1+ w, lmax2] in the range of envelope zero setting, and lmax1Before position and in lmax2L behind+w positionsmax2-lmax1In-w distances Envelope zero setting.
Step E, according to the current 1 second heart rate value of envelope peak interval calculation.
(3) beneficial effect
From above-mentioned technical proposal as can be seen that a kind of heart sound noise-reduction method of time-domain adaptive adding window of the invention have it is following Beneficial effect：
(1) suppress the noise with cardiechema signals with frequency band, improve signal to noise ratio；
(2) the faint cardiechema signals being submerged under compensation strong noise background, make heart rate curve more continuous.
Brief description of the drawings
Fig. 1 is the flow chart of the fetal heart sound noise-reduction method according to embodiment of the present invention time-domain adaptive adding window.
Fig. 2 is that the heart rate curve of the not windowing process for surveying fetal heart sound data 1 is bent with heart rate after self adaptation windowing process Line is contrasted；
Fig. 3 is that the heart rate curve of the not windowing process for surveying fetal heart sound data 2 is bent with heart rate after self adaptation windowing process Line is contrasted；
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference Accompanying drawing, the present invention is described in more detail.It should be noted that in accompanying drawing or specification description, similar or identical portion Divide and all use identical figure number.The implementation for not illustrated in accompanying drawing or being described, is those of ordinary skill in art Known form.In addition, though the demonstration of the parameter comprising particular value can be provided herein, it is to be understood that parameter is without definite etc. In corresponding value, but corresponding value can be similar in acceptable error margin or design constraint.Mentioned in embodiment Direction term, for example " on ", D score, "front", "rear", "left", "right" etc., be only the direction of refer to the attached drawing.Therefore, the side for using It is for illustrating not for limiting the scope of the invention to term.
A kind of fetal heart sound noise-reduction method of time-domain adaptive adding window of the present invention, the method assumes fetal heart sound envelope data up to It is few to there are two heart sound peaks that heartbeat twice is produced, self adaptation adding window is opened in the case of Fetal Heart Rate is continuous, arranged by some Screening and judgement, find two heart sound envelope peaks, and rectangular window is added on heart sound envelope peak, envelopes and rectangle in the middle of two rectangular windows The a range of envelope zero setting in side outside window, so as to retain useful fetal heart sound signal on envelope, rejects most of interference signal.
In one exemplary embodiment of the present invention, there is provided the tire of time-domain adaptive adding window is carried out to actual measurement fetal heart sound The demonstration of heart sound noise-reduction method.Fig. 1 is the flow of the fetal heart sound noise-reduction method of time-domain adaptive adding window according to embodiments of the present invention Figure.Fig. 1 is refer to, the present embodiment includes：
Step A, to i-th second original fetal heart sound data diN () is filtered, filter the interference signal outside fetal rhythm audio section, Obtain fetal heart sound filtering data fi(n), wherein, n=1,2 ..., N, IV is 1 second total sampling number；
Step B, to filtering data fiN () takes envelope, obtain envelope data ei(n)；
Step C, judge before M second whether the Fetal Heart Rate that Continuous plus go out in normal range (NR), if so, then unlatching time domain it is adaptive Adding window is answered, into step D, if it is not, being then not turned on adding window, step E is skipped to：
Step D, in envelope data eiN () carries out self adaptation adding window, export new envelope data, specifically includes：
Sub-step D1：According to Fetal Heart Rate value upper 1 second, the reference spacing L and spacing between current 1 second two rectangular window are generated Variation length dHAnd dL；
In sub-step D1, with reference to spacing L, the variation length d of spacingHAnd dLCan be calculated by below equation：
Wherein, IV is 1 second total sampling number, f0It is Fetal Heart Rate upper one second, Fetal Heart Rate is f0Represent f per minute0Secondary heartbeat, It is only fetal heart rate variation value.It is noted herein that, the frequency of heartbeat will not typically be mutated, and fetal heart rate variation value should not be set It is excessive.
Sub-step D2：It is the rectangular window of w to set width, is moved on the envelope of current 1 second, and moving step length is v, calculates every Individual original position is lkThe gross energy p of envelope in place's rectangular windowk, wherein, k=1,2 ..., K, K count for total position；
It should be noted that the width w of suggestion rectangular window is less than 1/2L in sub-step D2, if rectangle window width is too wide, drop Effect of making an uproar may not be good, meanwhile, moving step length is v unsuitable excessive.
Sub-step D3：Current 1 second envelope data is divided into Q sections, from pkIn find out every section in Energy maximum value pqAnd its phase Answer position lq, q=1,2 ..., Q；
Sub-step D4：From Q sections of maximum pqIn find out two maximum p for meeting conditionmax1And pmax2, it is recorded successively Position lmax1And lmax2；
What sub-step D4 selected two maximums must meet three below condition：
Condition a：lmax2-lmax1Value in [L-dL, L+dH] in the range of；
Condition b：lmax1In the initial range of setting；
Condition c：pmax1With pmax2Ratio be no more than 2.
Sub-step D5：With lmax1And lmax2It is the starting point of adding window, degree of widening is the rectangular window of w on envelope respectively, will be [lmax1+ w, lmax2] in the range of envelope zero setting, and lmax1Before position and in lmax2L behind+w positionsmax2-lmax1In-w distances Envelope zero setting.
It should be noted that such as there are three heartbeat envelope peaks on current 1 second envelope in sub-step D5, to two of which After envelope peak adds rectangular window, and to envelope zero setting in the certain limit of between rectangular window and both sides after, the 3rd heartbeat envelope peak is still So keep down, and noise near it also suppress to a certain extent.
Step E, according to the current 1 second heart rate value of envelope peak interval calculation.
Fig. 2 to Fig. 3 is given at two groups of heart rate curves of the not windowing process of actual measurement fetal heart sound data and self adaptation adding window Heart rate curve comparison figure after reason, it can be seen that due to noise jamming, it is intermittent that the heart rate curve before non-windowing process occurs Phenomenon, discontinuously typically continues several seconds to more than ten clocks, and by after self adaptation windowing process, it is suppressed that noise jamming, heart rate curve is non- Chang Lianxu.
So far, combined accompanying drawing has been described in detail to the present embodiment.According to above description, those skilled in the art Should have to a kind of fetal heart sound noise-reduction method of time-domain adaptive adding window of the invention and clearly recognize.
Additionally, the above-mentioned definition to each element and method is not limited in embodiment various concrete structures, the shape mentioned Shape or mode, those of ordinary skill in the art can simply be changed or be replaced to it.
In sum, the fetal heart sound noise-reduction method of a kind of time-domain adaptive adding window of the invention, by fetal heart sound data Envelope carries out self adaptation adding window, remains useful fetal heart sound signal on envelope, eliminates most of interference signal.Work as noise jamming When causing heart rate curve interrupted, this noise-reduction method can make heart rate curve more continuous.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect Describe in detail bright, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the invention, it is all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in guarantor of the invention Within the scope of shield.

Claims (5)

1. a kind of fetal heart sound noise-reduction method of time-domain adaptive adding window, it is characterised in that including：
Step A, to i-th second original fetal heart sound data diN () is filtered, filter the interference signal outside fetal rhythm audio section, obtains tire Heart sound filtering data fi(n), wherein, n=1,2 ..., IV, IV is 1 second total sampling number；
Step B, to filtering data fiN () takes envelope, obtain envelope data ei(n)；
Step C, determines whether to open time-domain adaptive adding window according to preceding M seconds Fetal Heart Rate value, if opening adding window, into step D, If being not turned on adding window, step E is skipped to；
Step D, in envelope data eiSelf adaptation adding window is carried out on (n), new envelope data is exported：
Step E, according to the current 1 second heart rate value of envelope peak interval calculation.
2. method according to claim 1, it is characterised in that the condition that the step C opens self adaptation adding window is：Preceding M The Fetal Heart Rate that second Continuous plus go out in normal range (NR).
3. method according to claim 1, it is characterised in that the step D is specifically included：
Sub-step D1：According to Fetal Heart Rate value upper 1 second, the change of the reference spacing L and spacing between current 1 second two rectangular window is generated Change length dHAnd dL；
Sub-step D2：Make rectangle window width for w, moved on the envelope of current 1 second, moving step length is v, calculates each start bit It is set to lkThe gross energy p of envelope in the rectangular window at placek, wherein, k=1,2 ..., K, K count for total position；
Sub-step D3：Current 1 second envelope data is divided into Q sections, from pkIn find out every section in Energy maximum value pqAnd its corresponding positions Put lq, q=1,2 ..., Q；
Sub-step D4：From Q sections of maximum pqIn find out two maximum p for meeting conditionmax1And pmax2, its rectangle is recorded successively The original position l of windowmax1And lmax2；
Sub-step D5：With lmax1And lmax2To add the starting point of rectangular window, degree of widening is the rectangular window of w on envelope respectively, then Will be in [lmax1+ w, lmax2] in the range of envelope zero setting, and lmax1Before position and in lmax2In l behind+w positionsmax2-lmax1- w away from From interior envelope zero setting.
4. method according to claim 3, it is characterised in that long with reference to the change of spacing L, spacing in the sub-step D1 Degree dHAnd dLRespectively：
L = 60 × N f 0
d L = 60 × N f 0 - 60 × N f 0 - f v
d H = 60 × N f 0 + f v - 60 × N f 0
Wherein, IV is 1 second total sampling number, f0It is Fetal Heart Rate upper one second, Fetal Heart Rate is f0Represent f per minute0Secondary heartbeat, fvIt is tire Heart rate change value.
5. method according to claim 3, it is characterised in that the sub-step D4 selects must meeting for two maximums Three below condition：
Condition a：lmax2-lmax1Value in [L-dL, L+dH] in the range of；
Condition b：lmax1In the initial range of setting；
Condition c：pmax1With pmax2Mutual ratios be no more than 2.
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CN108393906A (en) * 2018-03-01 2018-08-14 深圳普得技术有限公司 A kind of control robot realizes mechanical regular movements method and robot

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Publication number Priority date Publication date Assignee Title
CN108393906A (en) * 2018-03-01 2018-08-14 深圳普得技术有限公司 A kind of control robot realizes mechanical regular movements method and robot
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