CN102613969B - A kind of lead-fail detector determination methods and device - Google Patents
A kind of lead-fail detector determination methods and device Download PDFInfo
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Abstract
<b> the present invention is </b><bGreatT.Gre aT.GT lead-fail detector determination methods and device </b><bGreatT.Gre aT.GT.</b><bGreatT.Gre aT.GT the present invention adopts: conducted by conducting wire after gathering physiology signal; By the high-frequency noise of low-pass filtering treatment filtering human body signal, signal after low-pass filtering treatment and sinusoidal signal are carried out coupling processing, two kinds of signals are superposed, export after carrying out impedance transformation, export after differential amplification is carried out to this signal, carry out analog digital conversion, bandpass filtering treatment is carried out to this digital signal, physiology signal is carried out filtering, exports after obtaining the sinusoidal signal of assigned frequency; The digital signal of bandpass filtering treatment is carried out amplitude calculating, obtains the amplitude of sinusoidal signal with this; The sinusoidal signal amplitude finally will obtained, compares this sinusoidal signal amplitude and the amplitude threshold preset, judges with this connection status of leading.</b><bGreatT.Gre aT.GT adopts this kind of lead-fail detector determination methods, can ensure accurately to judge lead-fail detector at complex condition.</b>
Description
Technical field
the present invention relates to medical weak biological electrical signal collection detection technique field, be related specifically to for lead-fail detector determination methods and device during acquiring biological electric signals.
Background technology
in medical field, main a kind of of existing lead-fail detector judgment technology is that sinusoidal signal beyond AFE (analog front end) is coupled a normal electrocardiosignal frequency band is in AFE (analog front end) input channel, when right lower limb lead and all the other lead be linked into human body time, the amplitude of this sinusoidal signal on passage of respectively leading becomes very little and is common mode input, and after difference, this sinusoidal signal becomes fainter; When have lead correctly do not access time, sinusoidal signal amplitude for lead-fail detector judgement in this input channel of leading is known, after differential amplification, analog digital conversion, the method such as software application digital filtering obtains this sinusoidal signal, by judging that the amplitude size of this signal judges lead-fail detector state.
using above-mentioned AC coupled to judge there is such problem in the method for lead-fail detector: when right lower limb lead-fail detector, if remaining limb lead or chest lead are connecting or corresponding buffer (impedance transformation unit) all may be caused under the state that comes off saturated, after the difference channel of rear end, range of signal but may drop within the scope of normal signal, this can cause judging lead-fail detector, but signal is abnormal.
Summary of the invention
for overcoming above-mentioned defect, namely object of the present invention is to provide the lead-fail detector determination methods that a kind of accuracy is high, can adapt to complex conditions.
the present invention also aims to the lead-fail detector judgment means that the above-mentioned determination methods of a kind of application of high reliability is provided.
the object of the invention is to be achieved through the following technical solutions:
a kind of lead-fail detector determination methods of the present invention, it mainly comprises:
step I, signals collecting step, this step gathers physiology signal;
step II, Signal Pretreatment step, this step carries out pretreatment to the physiology signal gathered, comprise the high-frequency noise by low-pass filtering treatment filtering physiology signal, generate sinusoidal signal, again the signal after low-pass filtering treatment and this sinusoidal signal are carried out coupling processing, two kinds of signals are superposed, then impedance transformation is carried out to the signal after superposition;
step III, signal amplification procedure, this step obtains the signal after impedance transformation, carries out differential amplification process to this signal;
step IV, analog digital conversion step,
this step, to the signal after differential amplification, is carried out analog digital conversion, is converted to digital signal by analogue signal;
step V, filtering calculating, logic step,
this step obtains this digital signal and carries out filtering, produces the sinusoidal signal of assigned frequency, then carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtain its signal amplitude; Again sinusoidal signal amplitude and the amplitude threshold preset are compared, when sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off; Otherwise, judge to lead as connection status.
further, described filtering calculating, logic step comprise the following steps:
step V ', bandpass filtering step,
this step obtains this digital signal, and carries out bandpass filtering treatment to this digital signal, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency;
step V ", amplitude calculation procedure,
this step obtains the sinusoidal signal of this assigned frequency, and carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtains the amplitude of sinusoidal signal;
step V ' ' ', logic step,
this step obtains sinusoidal signal amplitude, this sinusoidal signal amplitude and the amplitude threshold preset is compared, judges connection status of leading; When sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off; When sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead as connection status.
improve as one, the frequency of the sinusoidal signal in described Signal Pretreatment step is outside the frequency band of physiological signal, and the wave filter carrying out bandpass filtering treatment in described bandpass filtering step is have the wave filter that linear phase is also integral coefficient.
further, the amplitude calculation method of the sinusoidal signal in described amplitude calculation procedure adopts slip discrete fourier transform method.
the present invention also provides a kind of judgment means adopting above-mentioned lead-fail detector determination methods, comprising: comprising: the sensor unit that sequential signal connects, Signal Pretreatment unit, amplifier circuit unit, AD conversion unit, CPU and the sinusoidal circuit for generating unit be connected with described Signal Pretreatment cell signal;
described sensor unit is connected to human body and physiological signal is converted to the signal of telecommunication, and the signal of telecommunication is outputted to Signal Pretreatment unit; Described sinusoidal circuit for generating unit is identical for generation of two-way frequency, the antipodal sinusoidal signal of phase place;
described Signal Pretreatment unit is connected with described sensor unit and sinusoidal circuit for generating cell signal respectively, this Signal Pretreatment unit is used for carrying out pretreatment to by low-pass filtering treatment to this signal of telecommunication, filter away high frequency noise, then be coupled the sinusoidal signal with fixed frequency produced from described sinusoidal signal generating unit, two kinds of signals are superposed, exports after then impedance transformation being carried out to the signal after superposition; Described signal amplifies for carrying out differential amplification to this input signal, carrys out filtering common mode signal; Then the signal after this differential amplification is outputted to AD conversion unit and carry out analog digital conversion; Described for converting analogue signal to digital signal;
described CPU is connected with AD conversion unit, carries out filtering for obtaining described digital signal, produces the sinusoidal signal of assigned frequency, then carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtain its signal amplitude; Again sinusoidal signal amplitude and the amplitude threshold preset are compared, when sinusoidal signal amplitude is greater than default amplitude threshold, then judge lead as the state of coming off and export; Otherwise, judge to lead as connection status and export.
further, described CPU mainly comprises: controlling of sampling unit, band-pass filter unit that sequential signal connects, magnitude computation unit, logic judgment unit;
described controlling of sampling unit carries out analog digital conversion for controlling described AD conversion unit, obtains this digital signal; The mid frequency of described band-pass filter unit is consistent with the frequency that described sinusoidal circuit for generating unit exports, and carries out bandpass filtering treatment, physiology signal is carried out filtering, obtain the sinusoidal signal of assigned frequency to this digital signal; Described magnitude computation unit obtains the amplitude of described sinusoidal signal waveform by slip discrete fourier transform method algorithm; Be preset with lead-fail detector threshold value in described logic judgment unit, the lead-fail detector threshold value of this amplitude and setting compares by this logic judgment unit, to judge the connection status of leading of current input channel.
as a kind of improvement, described sensor unit comprises: the physiological electrode being connected to human body, and the conducting wire be connected with this physiological electrode; Described conducting wire is connected with described Signal Pretreatment unit, physiology signal is converted to the signal of telecommunication and outputs signal to described pretreatment unit.
further, the path that respectively leads of described lead-fail detector judgment means is connected on centered level current potential by described Signal Pretreatment unit, and it comprises: the input protection that sequential signal connects and low-pass filter unit, AC-DC coupling unit, impedance transformation unit;
described input protection and low-pass filter unit are used for carrying out low-pass filtering pretreatment to the signal of telecommunication, filter away high frequency noise; Described AC-DC coupling unit is used for the sinusoidal signal that the signal after low-pass filtering treatment and sinusoidal signal generating unit produce to be coupled, and makes two kinds of Signal averaging; Described impedance transformation unit carries out impedance transformation process to the signal after superposition.
described input protection comprises with low-pass filter unit: two ends are connected the gas-discharge tube on described conducting wire and floating ground respectively, the current-limiting resistance be connected with the outfan of described sensor unit, the filter capacitor be connected with the input of described impedance transformation unit, the other end of this filter capacitor is connected with floating, center tap terminal and impedance transformation unit the double diode that is connected of in-phase input end, this double diode other two ends be connected with the positive-negative power of described lead-fail detector judgment means;
described AC-DC coupling unit comprises: the coupling capacitance be connected with the outfan of described sinusoidal circuit for generating unit, the resistance be connected with the input of described impedance transformation unit; The other end of described coupling capacitance is connected to the input of described impedance transformation unit, and the other end of described resistance is connected in described centered level;
described impedance transformation unit comprises: low noise list amplifier, and this low noise list amplifier in-phase end is the input of described impedance transformation unit, and its outfan is connected to described amplifier circuit unit.
further, described amplifier circuit unit is that instrument amplifier is formed, and its outfan is connected to described AD conversion unit; One tunnel sinusoidal signal of described sinusoidal circuit for generating unit is connected to an input of described impedance transformation unit, and another road sinusoidal signal is connected to another input of this impedance transformation unit.
advantage of the present invention and beneficial effect are: adopt this kind of lead-fail detector determination methods, can ensure that the complex conditions such as electrocardiograph does not connect at conducting wire, conducting wire all comes off, the impedance mismatching of large Hz noise, more serious differential path accurately judge lead-fail detector.
adopt the device of above-mentioned this kind of lead-fail detector determination methods, propose the impedance transformation unit that a kind of mode of fixing front end centered level by circuit suppresses lead-fail detector path, what may occur is saturated, and the Novel lead of the design evaluation algorithm that comes off can judge lead-fail detector more accurately and rapidly.
Accompanying drawing explanation
for ease of illustrating, the present invention is described in detail by following preferred embodiment and accompanying drawing.
Fig. 1 method flow diagram of the present invention;
Fig. 2 is the concrete steps FB(flow block) of Fig. 1;
Fig. 3 correspondence adopts the lead-fail detector judgment means structured flowchart of method shown in Fig. 2;
Fig. 4 is the enforcement schematic diagram of AC-DC coupling unit in Signal Pretreatment unit in Fig. 3;
Fig. 5 is the structured flowchart of logic judgment unit in Fig. 3.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
as shown in Figure 1, a kind of lead-fail detector determination methods of the present invention, it mainly comprises:
step I, signals collecting step, this step gathers physiology signal;
step II, Signal Pretreatment step, this step carries out pretreatment to the physiology signal gathered, comprise the high-frequency noise by low-pass filtering treatment filtering physiology signal, generate sinusoidal signal, signal after low-pass filtering treatment and this sinusoidal signal are carried out coupling processing, two kinds of signals are superposed, then impedance transformation is carried out to the signal after superposition;
step III, signal amplification procedure, this step obtains the signal after impedance transformation, carries out differential amplification process to this signal;
step IV, analog digital conversion step,
this step, to the signal after differential amplification, is carried out analog digital conversion, is converted to digital signal by analogue signal;
step V, filtering calculating, logic step,
this step obtains this digital signal and carries out filtering, produces the sinusoidal signal of assigned frequency, then carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtain its signal amplitude; Again sinusoidal signal amplitude and the amplitude threshold preset are compared, when sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off; Otherwise, judge to lead as connection status.
Fig. 2 is for adopting the steps flow chart of a kind of detailed description of the invention of method shown in Fig. 1:
Wherein, in Fig. 1, step I is equal to the signals collecting step 301 in Fig. 2,
This step comprises: by sensor unit 10 in such as Fig. 3, the physiology signal of acquisition is transmitted to Signal Pretreatment step 302; This sensor unit 10 generally comprises: physiological electrode and connected conducting wire, physiological electrode is generally limbs folder, breast is led and inhaled the conductor such as ball, electrode slice, it and human body close contact, to obtain physiology signal, then conduct to Signal Pretreatment unit by conducting wire.
In Fig. 1, step II is equal to the Signal Pretreatment step 302 in Fig. 2,
This step carries out pretreatment to the human body signal obtained.Namely, by the high-energy adopting the device of the known features such as protection circuit suppression defibrillation to send, known low-pass filtering technique process is used to carry out filter away high frequency noise, again the signal after low-pass filtering treatment and sinusoidal circuit for generating unit 60 as shown in Figure 3 are produced sinusoidal signal and carry out coupling processing, two signals are superposed; Then carry out impedance transformation to the signal after superposition, the effect of its this impedance transformation is the signal that high impedance obtains after superposition, then outputs to amplifying circuit; The frequency of this sinusoidal signal is outside the frequency band of physiological signal.
In Fig. 1, step III is equal to the signal amplification procedure 303 in Fig. 2,
This step obtains the signal after step 302 impedance transformation, carries out differential amplification, carry out filtering common mode signal with this to this signal; Analog-to-digital precision can be ensured after being amplified by signal.
In Fig. 1, step IV is equal to the analog digital conversion step 304 in Fig. 2,
After step 303 pair signal carries out differential amplification, step 304 carries out analog digital conversion, and analogue signal is converted to digital signal;
And in Fig. 1 step step V equal step 305 in Fig. 2,306, the set occurred in sequence of 307.
Bandpass filtering step 305,
The digital signal that obtaining step 304 is changed, and bandpass filtering treatment is carried out to this digital signal, physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency.
Wherein, the wave filter carrying out bandpass filtering treatment is have the wave filter that linear phase is also integral coefficient; What adopt in this detailed description of the invention has linear phase also for the wave filter of integral coefficient is described as follows: supposing the system sample frequency is 1000Hz, and the single sinusoidal frequency judged for lead-fail detector is 250Hz.Under this assumed condition, in order to can at real time execution 250Hz bandpass filtering under embedded platform, simultaneously in order to ensure that filtering 250Hz 250Hz wave trap that is sinusoidal, that retain other signals should have strict linear phase, to ensure that the signal after trap is without phase distortion, the wave filter of principle as shown in formula (1) is adopted to carry out 250Hz frequency-selecting process.Meanwhile, in order to reduce the amplitude-frequency of other unrelated frequencies, adopt cascade structure.
In formula (1), N is necessary for the positive integer power of 2; When N gets 128, the three dB bandwidth of frequency-selecting/trap is 8.952Hz.
(1)
While extraction 250Hz sine, from mixed signal, filtering 250Hz is sinusoidal, can obtain another road signal.
When 250Hz band filter adopts transfer function shown in formula (1), 250Hz notch filter can adopt shown in formula (2).Formula (2) transfer function is formula (1) transfer function and pure delay link sum.
(2)
Amplitude calculation procedure 306,
Digital signal by step 305 bandpass filtering treatment is carried out amplitude calculating, obtains the amplitude of sinusoidal signal with this;
The amplitude calculation method of sinusoidal signal of the present invention is calculated by the method for slip discrete Fourier transform (DFT) (SDFT), the method of this slip discrete Fourier transform (DFT) (SDFT) is: books " Digital Signal Processing " the 13rd chapter Section 18 361-366 page in 2006 published as China Machine Press, totally 6 pages, author is: (U.S.) Lyons (Lyons, R.G.); Translated by people such as Zhu Guangming, Cheng Jianyuan, Liu Baotong; This book English is by name: UnderstandingDigitalSignalProcessing, SecondEdition.
Concrete amplitude calculation method is in this embodiment: general under 1000Hz sample frequency, and the mono-sinusoidal SDFT transfer function of 250Hz is such as formula shown in (3).In formula (3), N value is necessary for the positive integer of 4 doubly.Delivery process is carried out to the result in formula (3), the mono-sine amplitude information of 250Hz can be obtained.
(3)
Logic step 307,
The amplitude of obtaining step 306 sinusoidal signal, compares this sinusoidal signal amplitude and the amplitude threshold preset, judges with this connection status of leading.When sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off, when sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead as connection status.
Fig. 3 adopts the lead-fail detector judgment means as Fig. 2 method, comprising: sensor unit 10, Signal Pretreatment unit 20, signal amplification unit 30, AD conversion unit 40, CPU 50, sinusoidal circuit for generating unit 60.
Sensor unit 10 is connected to human body and physiological signal is converted to the signal of telecommunication, and outputs to Signal Pretreatment unit 20.In Signal Pretreatment unit 20, first carry out pretreatment by low-pass filtering treatment to this signal of telecommunication, carry out filter away high frequency noise, be then coupled the sinusoidal signal with fixed frequency (such as 250Hz) produced from sinusoidal signal generating unit 60;
The sinusoidal signal of leading on path wherein connecting right arm (RA) is completely contrary with the phase place of other sinusoidal signals on path of leading connected except right lower limb (RL) and RA;
When to be also connected to by the path that respectively leads on centered level current potential to avoid conducting wire not connect, the saturated lead-fail detector caused of impedance transformation unit judges inaccurate simultaneously; The signal of telecommunication after carrying out low-pass filtering treatment is superposed with this sinusoidal signal, then the signal after superposition is inputed to impedance transformation subelement and carry out impedance transformation;
Amplifier circuit unit 30 carries out differential amplification to this input signal, carrys out filtering common mode signal; Then the signal after this differential amplification is outputted to AD conversion unit 40 and carry out analog digital conversion, convert analogue signal to digital signal.CPU 50 is for final lead-fail detector state recognition.Sinusoidal circuit for generating unit 60, phase place antipodal sinusoidal signal identical for generation of two-way frequency.
In this embodiment, sensor unit 10 is connected to human body by physiological electrode, and the other end of physiological electrode is connected to conducting wire electrode tip.The other end of conducting wire is connected to Signal Pretreatment unit 20.This unit achieves and physiology signal is converted to the signal of telecommunication, and outputs signal pretreatment unit.
Signal Pretreatment unit 20, comprises three subelements: input protection and low-pass filter unit S21, AC-DC coupling cell S 22, impedance transformation cell S 23.
particularly, input protection comprises with low-pass filter unit S21: two ends are connected the gas-discharge tube on described conducting wire and floating ground respectively, the current-limiting resistance be connected with the outfan of described sensor unit 10, the filter capacitor be connected with the input of described impedance transformation cell S 23, the other end of this filter capacitor is connected with floating, center tap terminal and impedance transformation unit the double diode that is connected of in-phase input end, this double diode other two ends be connected with the positive-negative power of described lead-fail detector judgment means;
AC-DC coupling cell S 22 detailed construction as shown in Figure 4, is made up of coupling capacitance and resistance.Wherein one end of electric capacity is connected to the outfan of sinusoidal circuit for generating 60, and the other end is connected to the input of impedance transformation cell S 23; One end of resistance is connected in centered level, and the other end is connected to the input of impedance transformation cell S 23.
Impedance transformation cell S 23 is made up of a high input impedance, low maladjustment voltage, low offset current, low noise list amplifier, single amplifier is used as voltage follower, its in-phase end is the input of impedance transformation cell S 23, and its outfan is connected to amplifier circuit unit 30.
Amplifier circuit unit 30 is made up of instrument amplifier, and for eliminating the common-mode signal in input channel, amplify AC signal, its outfan is connected to AD conversion unit 40.
CPU 50 primarily of controlling of sampling cell S 51, band-pass filter unit S52, magnitude computation unit S53, logic judgment unit S54.
Wherein, controlling of sampling cell S 51 carries out analog digital conversion for controlling AD conversion unit 40, and reads the digital quantity after conversion; The mid frequency of band-pass filter unit S52 is consistent with the frequency that sinusoidal circuit for generating unit 60 exports is 250Hz, and bandwidth selection is 8.9Hz, for obtaining the sine that frequency is 250Hz from mixed signal; Then magnitude computation unit S53 obtains by SDFT algorithm the amplitude that frequency is 250Hz place waveform; The lead-fail detector threshold value of this amplitude and setting compares by logic judgment unit S54, to judge the connection status of leading of current input channel.
Sinusoidal circuit for generating unit 60, the sinusoidal signal of, reverse-phase identical for generation of two-way frequency.Wherein a road sinusoidal signal is connected to an input (as RA) of impedance transformation cell S 23; Another road sinusoidal signal is connected to another input (other except RA and RL lead) of impedance transformation cell S 23.
As shown in Figure 5, through the input data that controlling of sampling cell S 51 obtains, be divided into two-way, one tunnel is mono-sinusoidal with the 250Hz extracted in input data through frequency-selective network (1), another road is after having the link of same delay with frequency-selective network, deduct frequency-selective network to export, obtain the bioelectrical signals without 250Hz sine.The mono-sinusoidal signal of 250Hz that frequency-selective network exports, as the input of sliding DFT (3), to extract the amplitude information of this sinusoidal signal.The amplitude that extraction obtains and fixed threshold compare, and when amplitude exceedes threshold value, represent lead-fail detector, at this moment output signal is forced zero setting by decision logic; Otherwise, represent connection of leading, export bioelectrical signals.
In this detailed description of the invention, when the amplitude of the 250Hz frequency place sine that logic judgment unit S54 gets is greater than the lead-fail detector threshold value set, then what judge current channel in advance leads as coming off; Otherwise think connection of leading.If every 100 milliseconds judge 1 lead-fail detector in advance, in 1 second, then can make 10 judgements to lead-fail detector state.When being judged as lead-fail detector in advance at least 5 times in 1 second, then finally confirm as current lead-fail detector.Namely lead-fail detector state draws a result in every 1 second.
In order to accurately judge lead-fail detector, usually lead-fail detector threshold value is arranged less than normal, but the impedance mismatching that the anti-myoelectricity interference performance of consideration system and xerosis cutis cause, this value is unsuitable too small, usually can choose that SDFT method obtains this bin magnitudes 70%, be greater than this value and think lead-fail detector, be less than this value and think connection of leading.Meanwhile, in order to avoid the lead-fail detector erroneous judgement that sporadic interference causes, can judge to add sluggishness to lead-fail detector.In addition, software also need according to system requirements judge AD conversion unit 60 whether saturated judge to lead whether come off.
the foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1.
a kind of lead-fail detector determination methods, is characterized in that, mainly comprise:
step I, signals collecting step, this step gathers physiology signal;
step II, Signal Pretreatment step, this step carries out pretreatment to the physiology signal gathered, comprise the high-frequency noise by low-pass filtering treatment filtering physiology signal, generate the sinusoidal signal that two-way frequency is identical, phase place is contrary, signal after low-pass filtering treatment and this sinusoidal signal are carried out coupling processing, two kinds of signals are superposed, then impedance transformation is carried out to the signal after superposition;
step III, signal amplification procedure, this step obtains the signal after impedance transformation, carries out differential amplification process to this signal;
step IV, analog digital conversion step,
this step, to the signal after differential amplification, is carried out analog digital conversion, is converted to digital signal by analogue signal;
step V, filtering calculating, logic step,
this step obtains this digital signal and carries out filtering, produces the sinusoidal signal of assigned frequency, then carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtain this sinusoidal signal amplitude; Again this sinusoidal signal amplitude and the amplitude threshold preset are compared, when sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off; Otherwise, judge to lead as connection status;
described filtering calculating, logic step comprise:
step V ', bandpass filtering step,
this step obtains this digital signal, and carries out bandpass filtering treatment to this digital signal, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency;
the wave filter carrying out bandpass filtering treatment in described bandpass filtering step is have the wave filter that linear phase is also integral coefficient;
wherein, the path that respectively leads all is connected on centered level current potential.
2.
lead-fail detector determination methods according to claim 1, is characterized in that, described filtering calculating, logic step comprise the following steps:
step V ', bandpass filtering step,
this step obtains this digital signal, and carries out bandpass filtering treatment to this digital signal, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency;
step V ", amplitude calculation procedure,
this step obtains the sinusoidal signal of this assigned frequency, and carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtains the amplitude of sinusoidal signal;
step V ' ' ', logic step,
this step obtains sinusoidal signal amplitude, this sinusoidal signal amplitude and the amplitude threshold preset is compared, judges connection status of leading; When sinusoidal signal amplitude is greater than default amplitude threshold, then judge to lead as the state of coming off; When sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead as connection status.
3.
lead-fail detector determination methods according to claim 1, it is characterized in that, the frequency of the sinusoidal signal in described Signal Pretreatment step is outside the frequency band of physiological signal, and the wave filter carrying out bandpass filtering treatment in described bandpass filtering step is have the wave filter that linear phase is also integral coefficient.
4.
lead-fail detector determination methods according to claim 2, is characterized in that, the amplitude calculation method of the sinusoidal signal in described amplitude calculation procedure adopts slip discrete fourier transform method.
5.
a kind of judgment means adopting lead-fail detector determination methods as described in claim 1-4 any one, it is characterized in that, comprising: the sensor unit that sequential signal connects, Signal Pretreatment unit, amplifier circuit unit, AD conversion unit, CPU and the sinusoidal circuit for generating unit be connected with described Signal Pretreatment cell signal;
described sensor unit is connected to human body and physiological signal is converted to the signal of telecommunication, and the signal of telecommunication is outputted to Signal Pretreatment unit; Described sinusoidal circuit for generating unit is identical for generation of two-way frequency, the antipodal sinusoidal signal of phase place;
described Signal Pretreatment unit is connected with described sensor unit and sinusoidal circuit for generating cell signal respectively, this Signal Pretreatment unit is used for carrying out low-pass filtering pretreatment to this signal of telecommunication, filter away high frequency noise, then be coupled the sinusoidal signal produced from described sinusoidal signal generating unit, two kinds of signals are superposed, exports after then impedance transformation being carried out to the signal after superposition; Described amplifier circuit unit is used for carrying out differential amplification to input signal, carrys out filtering common mode signal, then the signal after this differential amplification is outputted to AD conversion unit and carry out analog digital conversion; Described AD conversion unit is used for converting analogue signal to digital signal;
described CPU is connected with AD conversion unit, carries out filtering for obtaining described digital signal, produces the sinusoidal signal of assigned frequency, then carries out amplitude calculating to the sinusoidal signal of this assigned frequency, obtain this sinusoidal signal amplitude; Again sinusoidal signal amplitude and the amplitude threshold preset are compared, when sinusoidal signal amplitude is greater than default amplitude threshold, then judge lead as the state of coming off and export; Otherwise, judge to lead as connection status and export; Described CPU comprises: band-pass filter unit; Described bandpass filtering unit is have the wave filter that linear phase is also integral coefficient; The path that respectively leads of described lead-fail detector judgment means is connected on centered level current potential by described Signal Pretreatment unit.
6.
a kind of judgment means according to claim 5, is characterized in that, described CPU mainly comprises: the controlling of sampling unit that sequential signal connects, band-pass filter unit, magnitude computation unit and logic judgment unit;
described controlling of sampling unit carries out analog digital conversion for controlling described AD conversion unit, and obtains this digital signal; The mid frequency of described band-pass filter unit is identical with the frequency that described sinusoidal circuit for generating unit exports, and carries out bandpass filtering treatment, physiology signal is carried out filtering, obtain the sinusoidal signal of assigned frequency to this digital signal; Described magnitude computation unit calculates described sinusoidal signal amplitude by slip discrete fourier transform method; Be preset with lead-fail detector amplitude threshold in described logic judgment unit, this sinusoidal signal amplitude and the lead-fail detector amplitude threshold preset compare, to judge connection status of leading by described logic judgment unit.
7.
a kind of judgment means according to claim 5, is characterized in that, described sensor unit comprises: the physiological electrode being connected to human body, and the conducting wire be connected with this physiological electrode; Described conducting wire is connected with described Signal Pretreatment unit, physiology signal is converted to the signal of telecommunication and outputs signal to described pretreatment unit.
8.
a kind of judgment means according to claim 7, is characterized in that, described Signal Pretreatment unit comprises: the input protection that sequential signal connects and low-pass filter unit, AC-DC coupling unit and impedance transformation unit;
described input protection and low-pass filter unit are used for carrying out low-pass filtering pretreatment to the signal of telecommunication, filter away high frequency noise; Described AC-DC coupling unit is used for the sinusoidal signal that the signal after low-pass filtering treatment and sinusoidal signal generating unit produce to be coupled, and makes two kinds of Signal averaging; Described impedance transformation unit carries out impedance transformation process to the signal after superposition;
described input protection comprises with low-pass filter unit: two ends are connected the gas-discharge tube on described conducting wire and floating ground respectively, the current-limiting resistance be connected with the outfan of described sensor unit, the filter capacitor be connected with the input of described impedance transformation unit, the other end of this filter capacitor is connected with floating, center tap terminal and impedance transformation unit the double diode that is connected of in-phase input end, the other two ends of this double diode are connected with the positive-negative power of described lead-fail detector judgment means;
described AC-DC coupling unit comprises: the coupling capacitance be connected with the outfan of described sinusoidal circuit for generating unit, the resistance be connected with the input of described impedance transformation unit; The other end of described coupling capacitance is connected to the input of described impedance transformation unit, and the other end of described resistance is connected in described centered level;
described impedance transformation unit comprises: low noise list amplifier, and this low noise list amplifier in-phase end is the input of described impedance transformation unit, and its outfan is connected to described amplifier circuit unit.
9.
a kind of judgment means according to claim 8, is characterized in that, described amplifier circuit unit is that instrument amplifier is formed, and its outfan is connected to described AD conversion unit; The two-way sinusoidal signal that described sinusoidal circuit for generating unit produces, wherein a road sinusoidal signal is connected to an input of described impedance transformation unit, and another road sinusoidal signal is connected to another input of this impedance transformation unit.
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| CN102961131B (en) * | 2012-11-26 | 2014-06-25 | 西安交大辰方科技有限公司 | Automatic detection and transformation method for loose of electrocardiograph limb electrodes |
| CN103110415B (en) * | 2013-02-01 | 2015-06-24 | 深圳市理邦精密仪器股份有限公司 | Detection device and method for pace-making signal |
| CN104352215B (en) * | 2014-09-29 | 2017-03-22 | 深圳市理邦精密仪器股份有限公司 | Wireless fetus central monitoring method and system |
| CN104783783B (en) * | 2015-04-23 | 2017-05-17 | 康泰医学系统（秦皇岛）股份有限公司 | Method for handheld electrocardio detector to automatically start electrocardiogram recording |
| CN105595992A (en) * | 2016-01-29 | 2016-05-25 | 安徽华米信息科技有限公司 | Method and device for collecting electrocardiosignals and wearable equipment |
| CN108663596B (en) * | 2018-05-14 | 2024-08-06 | 无锡商业职业技术学院 | Wearable electrocardiograph lead falling-off detection device and detection method |
| CN109117769A (en) * | 2018-07-31 | 2019-01-01 | 东南大学 | A kind of real-time quality assessment feedback method for wearing type electrocardiogram acquisition |
| CN112535455B (en) * | 2019-09-20 | 2024-07-12 | 深圳市理邦精密仪器股份有限公司 | Filtering method, terminal device and computer storage medium |
| CN112741633B (en) * | 2019-10-31 | 2024-04-05 | 深圳市理邦精密仪器股份有限公司 | Electrocardiogram signal detection system and electrocardiosignal detection device |
| CN114224349B (en) * | 2021-12-10 | 2023-12-19 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
| CN116584950B (en) * | 2022-12-31 | 2024-05-24 | 北京津发科技股份有限公司 | Bioelectric signal abnormality monitoring method and device |
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