CN102613969A - Judgment method and device for falling off of leads - Google Patents
Judgment method and device for falling off of leads Download PDFInfo
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Abstract
The invention relates to a judgment method and device for falling off of leads. The judgment method comprises the following steps of: conducting a physiological signal after collecting the physiological signal of a human body; filtering the high-frequency noise of the signal of the human body through low-pass filtering processing, coupling the signal subjected to the low-pass filtering processing and a sinusoidal signal so as to superpose the two signals, outputting the signals after carrying out impedance conversion on the signals, outputting the signals after carrying out differential amplification on the signals, carrying out analog-to-digital conversion on the signals, carrying out band-pass filtering processing on digital signals, filtering the physiological signal of the human body, and outputting the sinusoidal signal after obtaining the sinusoidal signal with the assigned frequency; carrying out amplitude calculation on the digital signals subjected to the band-pass filter processing so as to obtain the amplitudes of the sinusoidal signal; and comparing the threshold of the amplitude of the sinusoidal signal with the threshold of a preset amplitude so as to judge the lead connection state. The judgment method for falling off of leads can ensure the accurate judgment of the falling off of the leads under a complex condition.
Description
Technical field
The present invention relates to medical faint acquiring biological electric signals detection technique field, specially refer to determination methods and the device of coming off that lead when being used for acquiring biological electric signals
Background technology
Existing main a kind of of judgment technology that come off of leading is that sinusoidal signal beyond normal electrocardiosignal frequency band of AFE(analog front end) coupling is on the AFE(analog front end) input channel in
medical field; When right lower limb leads and all the other lead when being linked into human body; The amplitude of this sinusoidal signal of respectively leading on the passage becomes very little and is the common mode input, and this sinusoidal signal becomes fainter after the difference; When correctly not inserting as leading; The come off sinusoidal signal amplitude judged of being used to lead on this input channel of leading is known; Amplify in difference, software uses method such as digital filtering to obtain this sinusoidal signal after the analog digital conversion, judges the state of coming off that leads through the amplitude size of judging this signal.
Use above-mentioned AC coupled to judge that there is such problem in the method that comes off of leading: when right lower limb leads when coming off; If remaining limb lead or chest lead all may cause corresponding buffered device (impedance converter unit) saturated under the connection or the state that comes off; After through the rear end difference channel; Range of signal but possibly drop in the normal signal scope, and this can cause, and can't judge leads comes off, but signal is unusual
Summary of the invention
for overcoming above-mentioned defective, the object of the invention promptly is to provide the determination methods that comes off of leading that a kind of accuracy is high, can adapt to complex conditions.
the present invention also aims to provide a kind of judgment means that comes off of leading of the above-mentioned determination methods of application of high reliability.
The objective of the invention is to realize through following technical scheme:
A kind of determination methods that comes off of leading of the present invention, it mainly comprises:
Step I, signals collecting step, this step is gathered physiology signal;
Step II, Signal Pretreatment step; This step is carried out pretreatment to the physiology signal of gathering; Comprise high-frequency noise, generate sinusoidal signal, again with the processing that is coupled of the signal after the low-pass filtering treatment and this sinusoidal signal through low-pass filtering treatment filtering physiology signal; Two kinds of signals are superposeed, then the signal after the stack is carried out the impedance conversion;
Step III, signal amplification procedure, this step obtain the signal after the impedance conversion, and this signal is carried out the difference processing and amplifying;
Step IV, analog digital conversion step,
Signal after this step is amplified difference carries out analog digital conversion, and being about to analog signal conversion is digital signal;
Step V, filtering calculating, logical judgment step,
this step is obtained this digital signal and is carried out filtering, produces the sinusoidal signal of assigned frequency, then the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains its signal amplitude; Again sinusoidal signal amplitude and preset amplitude threshold are compared,, then judge to lead to be the state of coming off when sinusoidal signal amplitude during greater than default amplitude threshold; Otherwise judging leads is connection status.
Further, said filtering calculating, logical judgment step may further comprise the steps:
The step V ', the bandpass filtering step,
This step is obtained this digital signal, and this digital signal is carried out bandpass filtering treatment, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency;
The step V ", the amplitude calculation procedure,
This step is obtained the sinusoidal signal of this assigned frequency, and the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains the amplitude of sinusoidal signal;
Step V ' ' ', logical judgment step,
this step is obtained the sinusoidal signal amplitude, and this sinusoidal signal amplitude and preset amplitude threshold are compared, and judges the connection status of leading; When sinusoidal signal amplitude during, then judge to lead to be the state of coming off greater than default amplitude threshold; When the sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead to be connection status.
are as a kind of improvement; The frequency of the sinusoidal signal in the said Signal Pretreatment step is outside the frequency band of physiological signal, and the wave filter that carries out bandpass filtering treatment in the said bandpass filtering step is to have linear phase and be the wave filter of integral coefficient.
are further again, and the amplitude computational methods of the sinusoidal signal in the said amplitude calculation procedure adopt the slip discrete fourier transform method.
The present invention also provides a kind of above-mentioned judgment means of determination methods of coming off of leading that adopts, and comprising: comprising: sensor unit, Signal Pretreatment unit, amplifier circuit unit, AD conversion unit, CPU that sequential signal connects and the sine generation circuit unit that is connected with said Signal Pretreatment cell signal;
Said sensor unit is connected to human body and converts physiological signal into the signal of telecommunication, and the signal of telecommunication is outputed to the Signal Pretreatment unit; The said sinusoidal circuit unit that takes place is used to produce that the two-way frequency is identical, the antipodal sinusoidal signal of phase place;
Said Signal Pretreatment unit is connected with the sinusoidal circuit unit signal that takes place with said sensor unit respectively; This Signal Pretreatment unit is used for through low-pass filtering treatment this signal of telecommunication being carried out pretreatment; Filter away high frequency noise; The sinusoidal signal with fixed frequency that is coupled then and produces from said sinusoidal signal generating unit superposes two kinds of signals, then the signal after the stack is carried out exporting after the impedance conversion; Said signal amplification is used for that this input signal is carried out difference amplifies, and comes the filtering common-mode signal; Signal after then this difference being amplified outputs to AD conversion unit and carries out analog digital conversion; Said being used for becomes digital signal with analog signal conversion;
said CPU is connected with AD conversion unit, is used to obtain said digital signal and carries out filtering, produces the sinusoidal signal of assigned frequency, then the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains its signal amplitude; Sinusoidal signal amplitude and preset amplitude threshold are compared, when sinusoidal signal amplitude during greater than default amplitude threshold, then judging leads is state of coming off and output again; Otherwise judging leads is connection status and output.
Further, said CPU mainly comprises: controlling of sampling unit, band-pass filter unit that sequential signal connects, amplitude computing unit, logic judgment unit;
said controlling of sampling unit is used to control said AD conversion unit and carries out analog digital conversion, obtains this digital signal; The mid frequency of said band-pass filter unit is consistent with the frequency of said sinusoidal generation circuit unit output, and this digital signal is carried out bandpass filtering treatment, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency; Said amplitude computing unit obtains the amplitude of said sinusoidal signal waveform through slip discrete fourier transform method algorithm; Be preset with the threshold value that comes off of leading in the said logic judgment unit, this logic judgment unit compares leading of this amplitude and the setting threshold value that comes off, to judge the connection status of leading of current input channel.
As a kind of improved, described sensor unit comprises
: be connected to the physiological electrode of human body, and the line that leads that is connected with this physiological electrode; The said line that leads links to each other with said Signal Pretreatment unit, and physiology signal is converted into the signal of telecommunication and outputs signal to said pretreatment unit.
Further; Described Signal Pretreatment unit is connected to said the come off path that respectively leads of judgment means of leading on the centered level current potential, and it comprises: input protection that sequential signal connects and low-pass filter unit, alternating current-direct current coupling unit, impedance converter unit;
said input protection and low-pass filter unit are used for the signal of telecommunication is carried out LPF pretreatment, filter away high frequency noise; Said alternating current-direct current coupling unit is used for the sinusoidal signal of signal after the low-pass filtering treatment and the generation of sinusoidal signal generating unit is coupled, and makes two kinds of signals stacks; Said impedance converter unit carries out the impedance conversion process to the signal after superposeing.
Said input protection comprises with low-pass filter unit: two ends are connected the gas-discharge tube on said lead line and floating ground respectively; The current-limiting resistance that links to each other with the outfan of said sensor unit; The filter capacitor that links to each other with the input of said impedance converter unit; The other end of this filter capacitor with link to each other floatingly, center tap terminal and impedance converter unit the double diode that links to each other of in-phase input end, this double diode other two ends link to each other with said the come off positive-negative power of judgment means of leading;
Said alternating current-direct current coupling unit comprises: with the high-frequency coupling electric capacity that the said sinusoidal outfan that circuit unit takes place is connected, the resistance that is connected with the input of said impedance converter unit; The other end of said high-frequency coupling electric capacity is connected to the input of said impedance converter unit, and the other end of said resistance is connected on the said centered level;
said impedance converter unit comprises: low noise list amplifier, and this low noise list amplifier in-phase end is the input of said impedance converter unit, its outfan is connected to said amplifier circuit unit.
are further, and said amplifier circuit unit is that instrument amplifier constitutes, and its outfan is connected to said AD conversion unit; Said sinusoidal road sinusoidal signal that circuit unit takes place is connected to an input of said impedance converter unit, and another road sinusoidal signal is connected to another input of this impedance converter unit.
advantage of the present invention and beneficial effect are: adopt this kind determination methods that comes off of leading, can guarantee that electrocardiograph does not connect, leads at the line that leads that line all comes off, big power frequency is disturbed, accurately judge to lead under the complex conditions such as impedance mismatching of more serious differential path and come off.
The device of determination methods is adopted above-mentioned this kind to lead to come off in
; Proposed a kind of through the fixing mode of the front end centered level impedance converter unit of path of coming off that suppresses to lead of circuit; What possibly occur is saturated, and the lead evaluation algorithm that comes off of design novel can be judged more accurately and rapidly to lead and comes off.
Description of drawings
In order to be easy to explanation, the present invention is done to describe 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;
The corresponding judgment means structured flowchart that comes off that leads that adopts method shown in Figure 2 of Fig. 3;
Fig. 4 is the enforcement sketch map of alternating current-direct current coupling unit in the Signal Pretreatment unit among Fig. 3;
Fig. 5 is the structured flowchart of logic judgment unit among Fig. 3.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, a kind of determination methods that comes off of leading of the present invention, it mainly comprises:
Step I, signals collecting step, this step is gathered physiology signal;
Step II, Signal Pretreatment step; This step is carried out pretreatment to the physiology signal of gathering; Comprise high-frequency noise, generate sinusoidal signal, with the processing that is coupled of the signal after the low-pass filtering treatment and this sinusoidal signal through low-pass filtering treatment filtering physiology signal; Two kinds of signals are superposeed, then the signal after the stack is carried out the impedance conversion;
Step III, signal amplification procedure, this step obtain the signal after the impedance conversion, and this signal is carried out the difference processing and amplifying;
Step IV, analog digital conversion step,
Signal after this step is amplified difference carries out analog digital conversion, and being about to analog signal conversion is digital signal;
Step V, filtering calculating, logical judgment step,
this step is obtained this digital signal and is carried out filtering, produces the sinusoidal signal of assigned frequency, then the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains its signal amplitude; Again sinusoidal signal amplitude and preset amplitude threshold are compared,, then judge to lead to be the state of coming off when sinusoidal signal amplitude during greater than default amplitude threshold; Otherwise judging leads is connection status.
Fig. 2 is the steps flow chart of a kind of specific embodiment of employing method shown in Figure 1:
Wherein, the step I is equal to the signals collecting step 301 among Fig. 2 among Fig. 1,
This step comprises: through like sensor unit among Fig. 3 10, the physiology signal that obtains is transmitted to Signal Pretreatment step 302; This sensor unit 10 generally comprises: physiological electrode and the connected line that leads; Physiological electrode is generally the limbs folder, breast is led conductors such as inhaling ball, electrode slice; It closely contacts to obtain physiology signal with human body, conducts to the Signal Pretreatment unit through the line that leads then.
The step II is equal to the Signal Pretreatment step 302 among Fig. 2 among Fig. 1,
This step is carried out pretreatment to the human body signal that obtains.Promptly; The high-energy that sends through the device that adopts holding circuit to suppress known configurations such as defibrillation; Use known low-pass filtering technique to handle filter away high frequency noise; To pass through signal and as shown in Figure 3 sine generation circuit unit 60 after the low-pass filtering treatment again and produce the sinusoidal signals processing that is coupled, two signals are superposeed; Then the signal after the stack is carried out the impedance conversion, the effect of its this impedance conversion is that high impedance obtains stack signal afterwards, outputs to amplifying circuit then; The frequency of this sinusoidal signal is outside the frequency band of physiological signal.
The step III is equal to the signal amplification procedure 303 among Fig. 2 among Fig. 1,
This step is obtained through the signal after the step 302 impedance conversion, this signal is carried out difference amplify, and comes the filtering common-mode signal with this; Through guaranteeing analog-to-digital precision after the signal amplification.
The step IV is equal to the analog digital conversion step 304 among Fig. 2 among Fig. 1,
After step 303 pair signal carried out the difference amplification, step 304 was carried out analog digital conversion, is digital signal with analog signal conversion;
And the step V equals the step 305,306 among Fig. 2, the set that 307 order takes place among Fig. 1.
The digital signal of obtaining step 304 conversion, and this digital signal carried out bandpass filtering treatment, physiology signal is carried out filtering, obtain the sinusoidal signal of assigned frequency.
Wherein, the wave filter that carries out bandpass filtering treatment is to have linear phase and be the wave filter of integral coefficient; That adopts in this specific embodiment has linear phase and specify as follows for the wave filter of integral coefficient: the supposing the system sample frequency is 1000Hz, and the come off single sinusoidal frequency of judgement of being used to lead is 250Hz.Under this assumed condition; For can be at real time execution 250Hz bandpass filtering under the embedded platform; Simultaneously in order to guarantee that filtering 250Hz 250Hz wave trap sinusoidal, that keep other signals should have strict linear phase; To guarantee that the signal behind the trap does not have phase distortion, employing wave filter of principle shown in formula (1) carries out the 250Hz frequency-selecting to be handled.Simultaneously, in order to reduce the amplitude-frequency of other unrelated frequencies, adopt cascade structure.
In the formula (1), N is necessary for 2 positive integer time power; When N got 128, the three dB bandwidth of frequency-selecting/trap was 8.952Hz.
Extracting the sinusoidal while of 250Hz, filtering 250Hz is sinusoidal from mixed signal, can obtain another road signal.
When the 250Hz band filter adopted transfer function shown in the formula (1), the 250Hz notch filter can adopt shown in the formula (2).Formula (2) transfer function is formula (1) transfer function and pure delay link sum.
The amplitude of will carrying out through the digital signal of step 305 bandpass filtering treatment is calculated, and obtains the amplitude of sinusoidal signal with this;
The amplitude computational methods of sinusoidal signal of the present invention are calculated through the method for slip DFT (SDFT); The method of this slip DFT (SDFT) is: 2006 the 13rd chapters the 18th of books " Digital Signal Processing " of publishing like China Machine Press save the 361-366 page or leaf; Totally 6 pages; The author is: and (U.S.A) Lyons (Lyons, R.G.); Translate by people such as Zhu Guangming, Cheng Jianyuan, Liu Baotong; This book is English by name: Understanding Digital Signal Processing, Second Edition.
Concrete amplitude computational methods in this specific embodiment are: generally under the 1000Hz sample frequency, the single sinusoidal SDFT transfer function of 250Hz is suc as formula shown in (3).In the formula (3), the N value is necessary for 4 positive integer doubly.Result in the formula (3) is carried out delivery handle, can obtain the single sine amplitude information of 250Hz.
The amplitude of obtaining step 306 sinusoidal signals compares this sinusoidal signal amplitude and preset amplitude threshold, judges the connection status of leading with this.When sinusoidal signal amplitude during greater than default amplitude threshold, then judge to lead to be the state of coming off, when the sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead to be connection status.
Fig. 3 is the judgment means that comes off of leading that adopts like Fig. 2 method, comprising: sensor unit 10, Signal Pretreatment unit 20, signal amplification unit 30, AD conversion unit 40, CPU 50, the sinusoidal circuit unit 60 that takes place.
The phase place that wherein connects the sinusoidal signal on sinusoidal signal and other paths that lead that are connected except that right lower limb (RL) and RA on the path that leads of right arm (RA) is opposite fully;
When the path that also will respectively lead simultaneously is connected on the centered level current potential and does not connect with the line of avoiding leading, the impedance converter unit is saturated leading of causing come off judge inaccurate; The signal of telecommunication and this sinusoidal signal that to carry out after the low-pass filtering treatment superpose, and the signal after will superposeing then inputs to impedance varitron unit and carries out the impedance conversion;
30 pairs of these input signals of amplifier circuit unit carry out difference and amplify, and come the filtering common-mode signal; Signal after then this difference being amplified outputs to AD conversion unit 40 and carries out analog digital conversion, and analog signal conversion is become digital signal.CPU 50 is used for the final state recognition that comes off of leading.The sinusoidal circuit unit 60 that takes place is used to produce that the two-way frequency is identical, the antipodal sinusoidal signal of phase place.
In this specific embodiment, sensor unit 10 is connected to human body through physiological electrode, and the other end of physiological electrode is connected to the line electrode end that leads.The other end of line of leading is connected to Signal Pretreatment unit 20.This unit has been realized converting physiology signal into the signal of telecommunication, and output Signal Pretreatment unit.
Particularly; Input protection comprises with low-pass filter unit S21: two ends are connected the gas-discharge tube on said lead line and floating ground respectively; The current-limiting resistance that links to each other with the outfan of said sensor unit 10; The filter capacitor that links to each other with the input of said impedance converter unit S23; The other end of this filter capacitor with link to each other floatingly, center tap terminal and impedance converter unit the double diode that links to each other of in-phase input end, this double diode other two ends link to each other with said the come off positive-negative power of judgment means of leading;
Alternating current-direct current coupling unit S22 detailed structure is as shown in Figure 4, is made up of high-frequency coupling electric capacity and resistance.Wherein an end of electric capacity is connected to the sinusoidal outfan that circuit 60 takes place, and the other end is connected to the input of impedance converter unit S23; One end of resistance is connected on the centered level, and the other end is connected to the input of impedance converter unit S23.
Impedance converter unit S23 is made up of a high input impedance, low maladjustment voltage, low offset current, low noise list amplifier; Single amplifier is as voltage follower; Its in-phase end is the input of impedance converter unit S23, and its outfan is connected to amplifier circuit unit 30.
Wherein, controlling of sampling cell S 51 is used to control AD conversion unit 40 and carries out analog digital conversion, and reads the digital quantity after the conversion; The mid frequency of band-pass filter unit S52 is consistent with the sinusoidal frequency that circuit unit 60 outputs take place to be 250Hz, and bandwidth is chosen as 8.9Hz, is used for obtaining the sine that frequency is 250Hz from mixed signal; Amplitude computing unit S53 obtains the amplitude that frequency is a 250Hz place waveform through the SDFT algorithm then; Logic judgment unit S54 compares leading of this amplitude and the setting threshold value that comes off, to judge the connection status of leading of current input channel.
The sinusoidal circuit unit 60 that takes place is used to produce that the two-way frequency is identical, the sinusoidal signal of phase place anti-phase.Wherein one tunnel sinusoidal signal is connected to the input (like RA) of impedance converter unit S23; Another road sinusoidal signal is connected to another input (other except that RA and RL lead) of impedance converter unit S23.
As shown in Figure 5; The input data that obtain through controlling of sampling cell S 51; Be divided into two-way, the one tunnel is single sinusoidal with the 250Hz that extracts in the input data through frequency-selective network (1), and another road is through after having the link of same delay with frequency-selective network; Deduct frequency-selective network output, obtain not having the sinusoidal bioelectrical signals of 250Hz.The single sinusoidal signal of the 250Hz of frequency-selective network output is as the input of slip DFT (3), to extract the amplitude information of this sinusoidal signal.Amplitude and fixed threshold that extraction obtains compare, and when amplitude surpasses threshold value, expression is led and come off, and at this moment decision logic will export signal pressure zero setting; Otherwise, represent to lead connection, the output bioelectrical signals.
In this specific embodiment, when the sinusoidal amplitude in 250Hz frequency place that logic judgment unit S54 gets access to greater than the threshold value of having set that comes off of leading, disconnected leading of anticipation then when prepass for coming off; Otherwise think the connection of leading.Come off if per 100 milliseconds of anticipations break to lead for 1 time, in 1 second, then can make 10 judgements the state of coming off that leads.Lead when coming off when at least 5 quilts in 1 second are judged as in advance, then finally confirm as current leading to come off.The state of coming off that promptly leads drew a result in per 1 second.
Come off in order accurately to judge to lead; Usually the threshold value that comes off of will leading is provided with less than normally; But the impedance mismatching that anti-myoelectricity interference performance of taking into account system and xerosis cutis cause, this value is unsuitable too small, can choose the SDFT method usually and obtain 70% of this bin magnitudes; Think to lead greater than this value to come off, think the connection of leading less than this value.Simultaneously, for fear of the erroneous judgement that comes off of leading that sporadic interference causes, can come off to leading and judge that adding is sluggish.In addition, software also need be judged that AD conversion unit 60 is whether saturated according to system requirements and judge to lead whether come off.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention
Claims (9)
1. the determination methods that comes off of leading is characterized in that, mainly comprises:
Step I, signals collecting step, this step is gathered physiology signal;
Step II, Signal Pretreatment step; This step is carried out pretreatment to the physiology signal of gathering; Comprise high-frequency noise, generate sinusoidal signal, with the processing that is coupled of the signal after the low-pass filtering treatment and this sinusoidal signal through low-pass filtering treatment filtering physiology signal; Two kinds of signals are superposeed, then the signal after the stack is carried out the impedance conversion;
Step III, signal amplification procedure, this step obtain the signal after the impedance conversion, and this signal is carried out the difference processing and amplifying;
Step IV, analog digital conversion step,
Signal after this step is amplified difference carries out analog digital conversion, and being about to analog signal conversion is digital signal;
Step V, filtering calculating, logical judgment step,
This step is obtained this digital signal and is carried out filtering, produces the sinusoidal signal of assigned frequency, then the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains this sinusoidal signal amplitude; Again this sinusoidal signal amplitude and preset amplitude threshold are compared,, then judge to lead to be the state of coming off when sinusoidal signal amplitude during greater than default amplitude threshold; Otherwise judging leads is connection status.
2. the determination methods that comes off of leading according to claim 1 is characterized in that, said filtering calculating, logical judgment step may further comprise the steps:
The step V ', the bandpass filtering step,
This step is obtained this digital signal, and this digital signal is carried out bandpass filtering treatment, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency;
The step V ", the amplitude calculation procedure,
This step is obtained the sinusoidal signal of this assigned frequency, and the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains the amplitude of sinusoidal signal;
Step V ' ' ', logical judgment step,
This step is obtained the sinusoidal signal amplitude, and this sinusoidal signal amplitude and preset amplitude threshold are compared, and judges the connection status of leading; When sinusoidal signal amplitude during, then judge to lead to be the state of coming off greater than default amplitude threshold; When the sinusoidal signal amplitude is less than or equal to default amplitude threshold, then judge to lead to be connection status.
3. the determination methods that comes off of leading according to claim 1; It is characterized in that; The frequency of the sinusoidal signal in the said Signal Pretreatment step is outside the frequency band of physiological signal, and the wave filter that carries out bandpass filtering treatment in the said bandpass filtering step is to have linear phase and be the wave filter of integral coefficient.
4. the determination methods that comes off of leading according to claim 2 is characterized in that, the amplitude computational methods of the sinusoidal signal in the said amplitude calculation procedure adopt the slip discrete fourier transform method.
5. any said judgment means of determination methods of coming off of leading of employing such as claim 1-4; It is characterized in that, comprising: sensor unit, Signal Pretreatment unit, amplifier circuit unit, AD conversion unit, CPU that sequential signal connects and the sine generation circuit unit that is connected with said Signal Pretreatment cell signal;
Said sensor unit is connected to human body and converts physiological signal into the signal of telecommunication, and the signal of telecommunication is outputed to the Signal Pretreatment unit; The said sinusoidal circuit unit that takes place is used to produce that the two-way frequency is identical, the antipodal sinusoidal signal of phase place;
Said Signal Pretreatment unit is connected with the sinusoidal circuit unit signal that takes place with said sensor unit respectively; This Signal Pretreatment unit is used for this signal of telecommunication is carried out the LPF pretreatment; Filter away high frequency noise; The sinusoidal signal that is coupled then and produces from said sinusoidal signal generating unit superposes two kinds of signals, then the signal after the stack is carried out exporting after the impedance conversion; Said signal amplification circuit unit is used for that this input signal is carried out difference and amplifies, and comes the filtering common-mode signal; Signal after then this difference being amplified outputs to AD conversion unit and carries out analog digital conversion; Said AD conversion unit is used for analog signal conversion is become digital signal;
Said CPU is connected with AD conversion unit, is used to obtain said digital signal and carries out filtering, produces the sinusoidal signal of assigned frequency, then the sinusoidal signal of this assigned frequency amplitude of carrying out is calculated, and obtains this sinusoidal signal amplitude; Sinusoidal signal amplitude and preset amplitude threshold are compared, when sinusoidal signal amplitude during greater than default amplitude threshold, then judging leads is state of coming off and output again; Otherwise judging leads is connection status and output.
6. the judgment means that comes off of leading according to claim 5 is characterized in that, said CPU mainly comprises: controlling of sampling unit, band-pass filter unit, amplitude computing unit and logic judgment unit that sequential signal connects;
Said controlling of sampling unit is used to control said AD conversion unit and carries out analog digital conversion, and obtains this digital signal; The mid frequency of said band-pass filter unit is identical with the frequency of said sinusoidal generation circuit unit output, and this digital signal is carried out bandpass filtering treatment, and physiology signal is carried out filtering, obtains the sinusoidal signal of assigned frequency; Said amplitude computing unit calculates said sinusoidal signal amplitude through the slip discrete fourier transform method; Be preset with the amplitude threshold that comes off that leads in the said logic judgment unit, said logic judgment unit compares this sinusoidal signal amplitude and preset the leading amplitude threshold that comes off, with the judgement connection status of leading.
7. a kind of judgment means that comes off of leading according to claim 5 is characterized in that described sensor unit comprises: be connected to the physiological electrode of human body, and the line that leads that is connected with this physiological electrode; The said line that leads links to each other with said Signal Pretreatment unit, and physiology signal is converted into the signal of telecommunication and outputs signal to said pretreatment unit.
8. a kind of judgment means that comes off of leading according to claim 7 is characterized in that, described Signal Pretreatment unit comprises: input protection and low-pass filter unit, alternating current-direct current coupling unit and impedance converter unit that sequential signal connects;
Said input protection and low-pass filter unit are used for the signal of telecommunication is carried out LPF pretreatment, filter away high frequency noise; Said alternating current-direct current coupling unit is used for the sinusoidal signal of signal after the low-pass filtering treatment and the generation of sinusoidal signal generating unit is coupled, and makes two kinds of signals stacks; Said impedance converter unit carries out the impedance conversion process to the signal after superposeing;
Described Signal Pretreatment unit is connected to said the come off path that respectively leads of judgment means of leading on the centered level current potential; Said input protection comprises with low-pass filter unit: two ends are connected the gas-discharge tube on said lead line and floating ground respectively; The current-limiting resistance that links to each other with the outfan of said sensor unit; The filter capacitor that links to each other with the input of said impedance converter unit; The other end of this filter capacitor with link to each other floatingly, center tap terminal and impedance converter unit the double diode that links to each other of in-phase input end, the other two ends of this double diode link to each other with said the come off positive-negative power of judgment means of leading;
Said alternating current-direct current coupling unit comprises: with the high-frequency coupling electric capacity that the said sinusoidal outfan that circuit unit takes place is connected, the resistance that is connected with the input of said impedance converter unit; The other end of said high-frequency coupling electric capacity is connected to the input of said impedance converter unit, and the other end of said resistance is connected on the said centered level;
Said impedance converter unit comprises: low noise list amplifier, and this low noise list amplifier in-phase end is the input of said impedance converter unit, its outfan is connected to said amplifier circuit unit.
9. a kind of judgment means that comes off of leading according to claim 8 is characterized in that, said amplifier circuit unit is that instrument amplifier constitutes, and its outfan is connected to said AD conversion unit; The said sinusoidal two-way sinusoidal signal that circuit unit produces that takes place, wherein one tunnel sinusoidal signal is connected to an input of said impedance converter unit, and another road sinusoidal signal is connected to another input of this impedance converter unit.
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Cited By (11)
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| CN103110415A (en) * | 2013-02-01 | 2013-05-22 | 深圳市理邦精密仪器股份有限公司 | Detection device and method for pace-making signal |
| CN104352215A (en) * | 2014-09-29 | 2015-02-18 | 深圳市理邦精密仪器股份有限公司 | Wireless fetus central monitoring method and system |
| 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 |
| 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 |
| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector 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 |
| CN112535455A (en) * | 2019-09-20 | 2021-03-23 | 深圳市理邦精密仪器股份有限公司 | Filtering method, terminal device and computer storage medium |
| CN112741633A (en) * | 2019-10-31 | 2021-05-04 | 深圳市理邦精密仪器股份有限公司 | Electrocardiosignal detection system and electrocardiosignal detection equipment |
| CN114224349A (en) * | 2021-12-10 | 2022-03-25 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
| CN116584950A (en) * | 2022-12-31 | 2023-08-15 | 北京津发科技股份有限公司 | Bioelectric signal abnormality monitoring method and device |
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| CN102961131A (en) * | 2012-11-26 | 2013-03-13 | 西安交大辰方科技有限公司 | Automatic detection and transformation method for loose of electrocardiograph limb electrodes |
| CN103110415A (en) * | 2013-02-01 | 2013-05-22 | 深圳市理邦精密仪器股份有限公司 | Detection device and method for pace-making signal |
| CN104352215A (en) * | 2014-09-29 | 2015-02-18 | 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 |
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| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector 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 |
| CN112535455A (en) * | 2019-09-20 | 2021-03-23 | 深圳市理邦精密仪器股份有限公司 | Filtering method, terminal device and computer storage medium |
| CN112741633A (en) * | 2019-10-31 | 2021-05-04 | 深圳市理邦精密仪器股份有限公司 | Electrocardiosignal detection system and electrocardiosignal detection equipment |
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| CN116584950A (en) * | 2022-12-31 | 2023-08-15 | 北京津发科技股份有限公司 | Bioelectric signal abnormality monitoring method and device |
| 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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