CN103977503B - A kind of PACE ripple checkout gear of low cost and method - Google Patents
A kind of PACE ripple checkout gear of low cost and method Download PDFInfo
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Abstract
The invention provides a kind of PACE ripple checkout gear and method of low cost, this PACE ripple checkout gear comprises signal gathering unit (201), signal amplification unit (202), DC offset and amplifying unit (203), PACE ripple intelligent detection unit (204), and described signal gathering unit (201) is for obtaining electrocardio and PACE ripple mixed signal from human body; Described PACE ripple intelligent detection unit (204) comprises analog-to-digital conversion module (2041), and this analog-to-digital conversion module (2041) has lower-order digit and high sampling rate.The invention has the beneficial effects as follows that two-stage amplifying circuit used in the present invention and DC offset circuit coordinate software to achieve the detection of lower-order digit analog-digital converter to PACE ripple cleverly, high degree reduce hardware cost, ensure that simultaneously high reliability PACE ripple detect.
Description
Technical field
The present invention relates to field of medical device, particularly relate to a kind of PACE ripple checkout gear and method of low cost.
Background technology
Some cardiac's et al. Ke cardiac pacemaker, cardiac pacemaker produces electric pulse triggering cardiac and beats, and maintains patient blood flow, and to sustain life, cardiac pacemaker produces electric pulse and is medically referred to as PACE ripple.PACE ripple and the measured circuit of electro-physiological signals detect simultaneously, if PACE accurately cannot be identified, will cause electrocardio measuring error; When PACE wave amplitude is larger, PACE ripple also can be modulated onto on respiratory wave, affects respiratory waveform.
According to ANSI/AAMIEC13:2002 standard, monitor PACE wave amplitude is ± 2mV ~ ± 700mV, and polarizing voltage input range is ± 300mV, and electrocardiosignal amplitude is ± 5mV.Three's sum signal amplitude is maximum exceedes ± 1V, so wide signal amplitude scope, if hardware circuit carries out high multiple amplification to signal, so when PACE amplitude is larger, circuit just there will be saturated, causes PACE ripple to detect unsuccessfully.The mode of therefore amplifying according to low multiple detects PACE ripple, will improve the figure place of analog-digital converter (ADC), so certainly will improve the cost of analog-digital converter.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of PACE ripple checkout gear of low cost.
The invention provides a kind of PACE ripple checkout gear of low cost, comprise signal gathering unit, signal amplification unit, DC offset and amplifying unit, PACE ripple intelligent detection unit, described signal gathering unit is used for obtaining the physiological signal with PACE ripple from human body;
Described signal amplification unit is connected with described signal gathering unit, and described signal amplification unit is used for carrying out one-level amplification to physiological signal;
Described DC offset and amplifying unit are connected with described signal amplification unit, for receiving the physiological signal amplified through one-level;
Described PACE ripple intelligent detection unit comprises analog-to-digital conversion module, D/A converter module, control and digital signal processing module, described analog-to-digital conversion module is connected with described signal amplification unit and described DC offset and amplifying unit respectively, for respectively the physiological signal of the simulation of described signal amplification unit and described DC offset and amplifying unit transmission being converted to digital signal; Described analog-to-digital conversion module figure place is for being less than or equal to 12, and described analog-to-digital conversion module sample rate is for being more than or equal to 4KHz; Described control is connected with described analog-to-digital conversion module with digital signal processing module, for receiving the digital signal that described analog-to-digital conversion module exports;
Described D/A converter module is connected with described control and digital signal processing module and described DC offset and amplifying unit respectively, for receiving the digital signal with DC bias signal controlling to export with digital signal processing module, and this digital signal is converted to the analogue signal with DC bias signal, and give described DC offset and amplifying unit by this analog signal transmission;
The digital signal that described control and digital signal processing module are changed through AD conversion unit for the simulation physiological signal obtaining signal amplification unit and transmit, and the PACE ripple signal extracted in this digital signal, and judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, then direct date processing is carried out to this digital signal; If weak PACE ripple signal, then control from this digital signal, to extract DC bias signal with digital signal processing module, and control analogue signal that this DC bias signal is converted to through D/A converter module and by this analog signal output to DC offset and amplifying unit; Described DC offset and amplifying unit are used for that this physiological signal through one-level amplification and the described analogue signal with DC bias signal are done difference and carry out DC offset, obtain DC offset signal, again secondary amplification is carried out to the signal after offsetting, control with digital signal processing module from the detection PACE ripple signal the DC offset signal after secondary amplifies;
Setting an amplitude intermediate value y, y ∈ [2 in amplitude [2mV, the 700mV] scope of input signal PACE, 700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
As a further improvement on the present invention, described signal amplification unit comprises the first differential signal amplification module, the first difference turns single-end circuit module, described first differential signal amplification module is connected with described signal gathering unit, and described first differential signal amplification module is used for being enlarged into differential signal to the physiological signal with PACE ripple; Described first difference turns single-end circuit module and is connected with described DC offset and amplifying unit with described first differential signal amplification module, described analog-to-digital conversion module respectively, and described first difference turns single-end circuit module and exports to described analog-to-digital conversion module and described DC offset and amplifying unit for differential signal being converted to single-ended signal.
As a further improvement on the present invention, described signal amplification unit also comprises channel selecting module, described channel selecting module is connected with described signal gathering unit, described first differential signal amplification module respectively, physiological signal for carrying out the switching of electrocardiac channel, and is transferred to described first differential signal amplification module by electrocardiac channel by described channel selecting module.
As a further improvement on the present invention, described channel selecting module comprises analog switch, and described analog switch is used for switching each electrocardiac channel.
As a further improvement on the present invention, described DC offset and amplifying unit comprise subtractor, the second differential signal amplification module, the second difference turn single-end circuit module, described subtractor is connected with described signal amplification unit with described D/A converter module respectively, described subtractor is used for the physiological signal amplified through one-level and the described analogue signal with DC bias signal being done difference and carries out DC offset, obtains DC offset signal; Described second differential signal amplification module is connected with described subtractor, for carrying out secondary amplification to DC offset signal; Described second difference turns single-end circuit module and is connected with described analog-to-digital conversion module with described signal amplification unit respectively, and described second difference turns single-end circuit module and exports to described analog-to-digital conversion module for the differential signal after secondary amplification is converted to single-ended signal.
As a further improvement on the present invention, described control and digital signal processing unit comprise PACE channel control module, described PACE channel control module is connected with described channel selecting module, and described PACE channel control module is selected for the switch exporting PACE passage.
As a further improvement on the present invention, described control and digital signal processing module comprise bandpass filtering modules block, PACE characteristic parameter extraction module, described bandpass filtering modules block is connected with described analog-to-digital conversion module, the digital signal that described bandpass filtering modules block is used for analog-to-digital conversion module exports carries out digital filtering, extracts the PACE ripple signal in digital signal; Described PACE characteristic parameter extraction module is connected with described D/A converter module with described bandpass filtering modules block respectively, described PACE characteristic parameter extraction module is used for carrying out extraction PACE characteristic parameter to PACE ripple signal, and the PACE characteristic parameter of extraction is transferred to described D/A converter module.
Present invention also offers and a kind ofly use described PACE ripple checkout gear to carry out the method detected, comprise the steps:
A. signals collecting, obtains the physiological signal with PACE ripple from human body by signal gathering unit;
B. one-level differential amplification, carries out one-level amplification by signal amplification unit to the physiological signal of the simulation that described signal gathering unit exports;
C. analog digital conversion, is converted to digital signal by analog-to-digital conversion module by the analogue signal that described signal amplification unit exports;
D. judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, so carry out date processing by described control and digital signal processing module; If weak PACE ripple signal, so carries out secondary amplification procedure;
Described secondary amplification procedure comprises the steps:
The first step: DC offset and secondary amplify, direct current biasing value signal in weak PACE ripple signal is converted to analogue signal through D/A converter module by described control and digital signal processing module, and by this analog signal output to DC offset and amplifying unit, and control with digital signal processing module control described signal amplification unit one-level is amplified after physiological signal export to described DC offset and amplifying unit, the dc-bias that physiological signal after the one-level amplification that described DC offset and amplifying unit signal amplification unit export deducts the output of described D/A converter module carries out DC offset, obtain DC offset signal, again secondary amplification is carried out to the signal after counteracting,
Second step: analog digital conversion, the analogue signal through secondary amplification described DC offset and amplifying unit exported by analog-to-digital conversion module is converted to digital signal;
3rd step: Digital Signal Processing, carries out detection PACE ripple signal by described control and digital signal processing module to the digital signal that described analog-to-digital conversion module exports;
Setting an amplitude intermediate value y, y ∈ [2 in amplitude [2mV, the 700mV] scope of input signal PACE, 700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
As a further improvement on the present invention, described date processing comprises digital filtering, filters low-and high-frequency noise, filters out electrocardiosignal, realizes the extraction to PACE ripple signal, extracts PACE characteristic parameter further to the PACE ripple signal extracted.
As a further improvement on the present invention, described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
The invention has the beneficial effects as follows: two-stage amplifying circuit used in the present invention and DC offset circuit coordinate software to achieve the detection of lower-order digit analog-digital converter to PACE ripple cleverly, high degree reduce hardware cost, ensure that simultaneously high reliability PACE ripple detect.
Accompanying drawing explanation
Fig. 1 is PACE ripple checkout gear theory diagram of the present invention.
Fig. 2 is signal amplification unit theory diagram of the present invention.
Fig. 3 is DC offset of the present invention and amplifying unit theory diagram.
Fig. 4 is control of the present invention and digital signal processing unit theory diagram.
Fig. 5 is method flow diagram of the present invention.
Detailed description of the invention
As shown in Figure 1, the invention discloses a kind of PACE ripple checkout gear of low cost, comprise signal gathering unit 201, signal amplification unit 202, DC offset and amplifying unit 203, PACE ripple intelligent detection unit 204, described signal gathering unit 201 is for obtaining the physiological signal with PACE ripple from human body;
Described signal amplification unit 202 is connected with described signal gathering unit 201, and described signal amplification unit 202 is for carrying out one-level amplification to physiological signal;
Described DC offset and amplifying unit 203 are connected with described signal amplification unit 202, for receiving the physiological signal amplified through one-level;
Described PACE ripple intelligent detection unit 204 comprises analog-to-digital conversion module 2041, D/A converter module 2042, controls and digital signal processing module 2043, described analog-to-digital conversion module 2041 is connected with described signal amplification unit 202 and described DC offset and amplifying unit 203 respectively, and the physiological signal for the simulation described signal amplification unit 202 and described DC offset and amplifying unit 203 transmitted respectively is converted to digital signal; Described analog-to-digital conversion module 2041 figure place is for being less than or equal to 12, and described analog-to-digital conversion module 2041 sample rate is for being more than or equal to 4KHz; Described control is connected with described analog-to-digital conversion module 2041 with digital signal processing module 2043, for receiving the digital signal that described analog-to-digital conversion module 2041 exports;
Described D/A converter module 2042 is connected with described control and digital signal processing module 2043 and described DC offset and amplifying unit 203 respectively, for receiving the digital signal with DC bias signal controlling to export with digital signal processing module 2043, and this digital signal is converted to the analogue signal with DC bias signal, and give described DC offset and amplifying unit 203 by this analog signal transmission;
The digital signal that described control and digital signal processing module 2043 are changed through AD conversion unit for the simulation physiological signal obtaining signal amplification unit 202 and transmit, and the PACE ripple signal extracted in this digital signal, and judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, then direct date processing is carried out to this digital signal; If weak PACE ripple signal, then control from this digital signal, to extract DC bias signal with digital signal processing module 2043, and control analogue signal that this DC bias signal is converted to through D/A converter module 2042 and by this analog signal output to DC offset and amplifying unit 203; Described DC offset and amplifying unit 203 carry out DC offset for this physiological signal through one-level amplification and the described analogue signal with DC bias signal are done difference, obtain DC offset signal, again secondary amplification is carried out to the signal after offsetting, control with digital signal processing module 2043 from the detection PACE ripple signal the DC offset signal after secondary amplifies;
Setting an amplitude intermediate value y, y ∈ [2 in amplitude [2mV, the 700mV] scope of input signal PACE, 700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
Signal gathering unit 201 obtains the physiological signal with PACE ripple from human body, this physiological signal comprises electrocardio and PACE ripple mixed signal.
Because PACE ripple signal and electrocardiosignal belong to the signal of telecommunication together, both aliasings, can gather PACE ripple signal from original electrocardiosignal, and signal gathering unit 201 is for obtaining electrocardio and PACE mixed signal from human body.
Signal amplification unit 202 is amplified to PACE ripple signal in suitable scope, ensures that strong PACE ripple signal amplitude gamut can detect.
Analog-to-digital conversion module 2041 input is connection signal amplifying unit 202 and DC offset and amplifying unit 203 respectively, this analog-to-digital conversion module 2041 is for being converted to digital signal respectively 2 tunnel analogue signals, and concrete which signal that uses carries out Digital Signal Processing by controlling to determine with digital signal processing module 2043.
Analog-to-digital conversion module 2041 uses lower-order digit ADC, to reduce the cost of circuit.ANSI/AAMIEC13:2002 specifies to need the PACE ripple deration of signal detected to be 0.1ms ~ 2ms, therefore must improve sample rate as much as possible.
D/A converter module 2042 is for being converted to analogue signal the direct current biasing digital signal controlling to export with digital signal processing module 2043.
Control with digital signal processing module 2043 pairs of analog digital conversion after signal carry out Digital Signal Processing, and the control of realizing circuit.
As shown in Figure 2, described signal amplification unit 202 comprises the first differential signal amplification module 2022, first difference and turns single-end circuit module 2023, described first differential signal amplification module 2022 is connected with described signal gathering unit 201, and described first differential signal amplification module 2022 is for being enlarged into differential signal to the physiological signal with PACE ripple; Described first difference turns single-end circuit module 2023 and is connected with described DC offset and amplifying unit 203 with described first differential signal amplification module 2022, described analog-to-digital conversion module 2041 respectively, and described first difference turns single-end circuit module 2023 and exports to described analog-to-digital conversion module 2041 and described DC offset and amplifying unit 203 for differential signal being converted to single-ended signal.
Described signal amplification unit 202 also comprises channel selecting module 2021, described channel selecting module 2021 is connected with described signal gathering unit 201, described first differential signal amplification module 2022 respectively, physiological signal for carrying out the switching of electrocardiac channel, and is transferred to described first differential signal amplification module 2022 by electrocardiac channel by described channel selecting module 2021; Described channel selecting module 2021 is connected with digital signal processing unit 2043 with described control, and described control and digital signal processing unit 2043 control the switching of electrocardiac channel.
Described channel selecting module 2021 comprises analog switch, and described analog switch is used for switching each electrocardiac channel.
Channel selecting module 2021, for reducing the complexity of hardware circuit and reducing hardware cost, by using analog switch to switch each electrocardiac channel, achieves the task that a circuit completes multi-channel detection.
First differential signal amplification module 2022 is difference amplifiers, this difference amplifier synchronously amplifies PACE ripple signal and electrocardiosignal, do not carry out filter process, PACE ripple signal is separated completely by software simulating with electrocardiosignal, saves circuit structure further and reduces costs; The gain of this difference amplifier is x1.
Consider that MCU chip does not generally have signal differential to input, so turn single-end circuit module 2023 by the first difference differential signal is transferred to single ended signal.
As shown in Figure 3, described DC offset and amplifying unit 203 comprise subtractor 2031, second differential signal amplification module 2032, second difference and turn single-end circuit module 2033, described subtractor is connected with described signal amplification unit 202 with described D/A converter module 2042 respectively, described subtractor is used for the physiological signal amplified through one-level and the described analogue signal with DC bias signal being done difference and carries out DC offset, obtains DC offset signal; Described second differential signal amplification module 2032 is connected with described subtractor 2031, for carrying out secondary amplification to DC offset signal; Described second difference turns single-end circuit module 2033 and is connected with described analog-to-digital conversion module 2041 with described signal amplification unit 202 respectively, and described second difference turns single-end circuit module 2033 and exports to described analog-to-digital conversion module 2041 for the differential signal after secondary amplification is converted to single-ended signal.
The Main Function of DC offset and amplifying unit 203 weak PACE ripple signal is carried out secondary be amplified in suitable scope, ensure weak PACE ripple signal significantly gamut can detect.
The D. C. value that subtractor 2031 exports for cutting D/A converter module 2042, the DC component in bucking circuit, prevents due to DC component that to amplify the circuit caused saturated, the dynamic range of expansion circuit.
Second differential signal amplification module 2032 is difference amplifiers, and this difference amplifier synchronously amplifies weak PACE ripple signal and electrocardiosignal, does not carry out filter process, and the later separation of PACE ripple signal and electrocardiosignal is completely still by software simulating; The gain of this difference amplifier is x2.
Second difference turns single-end circuit module 2033 for differential signal is transferred to single-ended signal.
As shown in Figure 4, described control and digital signal processing module 2043 comprise PACE channel control module 20433, described PACE channel control module 20433 is connected with described channel selecting module 2021, and described PACE channel control module 20433 is selected for the switch exporting PACE passage.
Described control and digital signal processing module 2043 comprise bandpass filtering modules block 20431, PACE characteristic parameter extraction module 20432, described bandpass filtering modules block 20431 is connected with described analog-to-digital conversion module 2041, described bandpass filtering modules block 20431 carries out digital filtering for the digital signal exported analog-to-digital conversion module 2041, filter low-and high-frequency noise, filter out electrocardiosignal, realize the extraction to PACE ripple signal; Described PACE characteristic parameter extraction module 20432 is connected with described D/A converter module 2042 with described bandpass filtering modules block 20431 respectively, the PACE characteristic parameter of extraction for carrying out extraction PACE characteristic parameter to PACE ripple signal, and is transferred to described D/A converter module 2042 by described PACE characteristic parameter extraction module 20432; Described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
Direct current biasing acquisition methods is: after the initial data after analog-to-digital conversion module 2041 carries out analog digital conversion cuts PACE ripple signal, calculates the meansigma methods of signal in a period of time.
As shown in Figure 5, the invention also discloses and a kind ofly use described PACE ripple checkout gear to carry out the method detected, comprise the steps:
In step sl, signals collecting, obtains the physiological signal with PACE ripple from human body by signal gathering unit 201;
The incoming wave amplitude of PACE ripple signal detection is ± 2mV ~ ± 700mV, scope very wide, in method of the present invention, at the amplitude [2mV of input signal PACE, 700mV] scope interior the amplitude intermediate value y setting, y ∈ [2,700] mV, PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal; PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
Hereafter mentioned strong PACE ripple signal, weak PACE ripple signal refers in particular to the specific PACE ripple signal in above scope.
In step s 2, one-level differential amplification, carries out one-level amplification by signal amplification unit 202 to the physiological signal that described signal gathering unit 201 exports;
In step s 2, carrying out one-level amplification is X1, after one-level is amplified, the mixed signal of strong PACE ripple superimposed signal circuit DC component both can not saturated (having shown as the maximum output area that voltage amplitude exceedes circuit), gamut obtains larger amplitude again, extraordinary signal accuracy can be obtained after analog digital conversion, directly carry out Digital Signal Processing.After one-level is amplified, can ensure that strong PACE ripple signal gamut can detect.
In step s3, analog digital conversion, is converted to digital signal by analog-to-digital conversion module 2041 by the analogue signal that described signal amplification unit 202 exports;
In step s 4 which, judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, so carry out date processing by described control and digital signal processing module 2043; If weak PACE ripple signal, so carries out secondary amplification procedure.
In step s 4 which, software judges the digital signal amplitude collected after one-level is amplified, if amplitude is in [2, y], is then judged as weak PACE ripple signal, needs further to amplify, performs secondary amplification procedure; If amplitude is then judged as strong PACE ripple signal in [y, 700mV] scope, directly date processing can be carried out.
Secondary amplification procedure comprises the steps:
In step W1: DC offset and secondary amplify, direct current biasing value signal in weak PACE ripple signal is converted to analogue signal through D/A converter module 2042 by described control and digital signal processing module 2043, and by this analog signal output to DC offset and amplifying unit 203, and control with digital signal processing module 2043 control described signal amplification unit 202 one-level is amplified after physiological signal export to described DC offset and amplifying unit 203, the dc-bias that physiological signal after described DC offset and amplifying unit 203 amplify by the one-level that signal amplification unit 202 exports deducts the output of described D/A converter module 2042 carries out DC offset, obtain DC offset signal, again secondary amplification is carried out to the signal after counteracting,
In step W2: analog digital conversion, the analogue signal through secondary amplification described DC offset and amplifying unit 203 exported by analog-to-digital conversion module 2041 is converted to digital signal;
In step W3: Digital Signal Processing, by described control and digital signal processing module 2043, detection PACE ripple signal is carried out to the digital signal that described analog-to-digital conversion module 2041 exports.
Setting an amplitude intermediate value y, y ∈ [2 in amplitude [2mV, the 700mV] scope of input signal PACE, 700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
Described date processing comprises digital filtering, filters low-and high-frequency noise, filters out electrocardiosignal, realizes the extraction to PACE ripple signal, extracts PACE characteristic parameter further to the PACE ripple signal extracted.
Described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
In secondary amplification procedure, second level amplification is carried out to the weak PACE ripple signal collected, amplification is X2, for weak PACE ripple signal, because amplitude is too small, even if amplify through one-level, the signal accuracy using the analog-digital converter of lower-order digit to gather is still inadequate, directly cannot carry out Digital Signal Processing; The secondary amplification of weak PACE ripple signal demand is comparatively large, therefore before amplification, needs the DC component of system to balance out, to improve the dynamic range of circuit; The multiple that secondary amplifies is X2, choosing of X2 needs to ensure that the amplitude of y*X1*X2 is not more than the maximum output area of circuit, and to weak PACE ripple signal after x1*x2 doubly amplifies, good signal accuracy can be obtained after being input to lower-order digit analog-digital converter, can ensure that weak PACE ripple signal gamut can detect after secondary amplifies.
Beneficial effect: the present invention adopts the mode of software and hardware combining to detect PACE ripple, software switches to the electrocardiac channel needing to detect PACE by multiway analog switch, by low multiple signal amplification unit 202, signal is amplified (being referred to as first order amplifying circuit) thereupon, lower-order digit is passed through after amplification, the analog-to-digital conversion module 2041 of high sampling rate gathers, software processes the signal collected, and contrast PACE wave characteristic, if meet PACE wave characteristic, so PACE ripple just detects at first order amplifying circuit, this level only can collect significantly PACE ripple.If PACE ripple is not detected at first order amplifying circuit, can judge that PACE wave amplitude is less, so the signal of first order amplifying circuit output is by the DC component (i.e. polarizing voltage) in the DC offset by being measured by software control counteracting and amplifying unit 203 offseting signal, and by high multiple amplifying circuit, signal is amplified (being referred to as second level amplifying circuit), finally by lower-order digit, the analog-to-digital conversion module 2041 of high sampling rate gathers, software processes the signal collected, and contrast PACE wave characteristic, the PACE ripple of low amplitude can be obtained.First order amplifying circuit and second level amplifying circuit and software with the use of ensure that PACE ripple can be detected in gamut.
Two-stage amplifying circuit used in the present invention and DC offset circuit coordinate software to achieve the detection of lower-order digit analog-digital converter to PACE ripple cleverly, high degree reduce hardware cost, ensure that the PACE ripple of high reliability detects simultaneously.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the PACE ripple checkout gear of a low cost, it is characterized in that: comprise signal gathering unit (201), signal amplification unit (202), DC offset and amplifying unit (203), PACE ripple intelligent detection unit (204), described signal gathering unit (201) is for obtaining the physiological signal with PACE ripple from human body;
Described signal amplification unit (202) is connected with described signal gathering unit (201), and described signal amplification unit (202) is for carrying out one-level amplification to physiological signal;
Described DC offset and amplifying unit (203) are connected with described signal amplification unit (202), for receiving the physiological signal amplified through one-level;
Described PACE ripple intelligent detection unit (204) comprises analog-to-digital conversion module (2041), D/A converter module (2042), controls and digital signal processing module (2043), described analog-to-digital conversion module (2041) is connected with described signal amplification unit (202) and described DC offset and amplifying unit (203) respectively, and the physiological signal for the simulation described signal amplification unit (202) and described DC offset and amplifying unit (203) transmitted respectively is converted to digital signal; Described analog-to-digital conversion module (2041) figure place is for being less than or equal to 12, and described analog-to-digital conversion module (2041) sample rate is for being more than or equal to 4KHz; Described control is connected with described analog-to-digital conversion module (2041) with digital signal processing module (2043), for receiving the digital signal that described analog-to-digital conversion module (2041) exports;
Described D/A converter module (2042) is connected with described control and digital signal processing module (2043) and described DC offset and amplifying unit (203) respectively, for receiving the digital signal with DC bias signal controlling to export with digital signal processing module (2043), and this digital signal is converted to the analogue signal with DC bias signal, and give described DC offset and amplifying unit (203) by this analog signal transmission;
The digital signal that described control and digital signal processing module (2043) are changed through AD conversion unit for the simulation physiological signal obtaining signal amplification unit (202) and transmit, and the PACE ripple signal extracted in this digital signal, and judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, then direct date processing is carried out to this digital signal; If weak PACE ripple signal, then control from this digital signal, to extract DC bias signal with digital signal processing module (2043), and control this DC bias signal and be converted to analogue signal and by this analog signal output to DC offset and amplifying unit (203) through D/A converter module (2042); Described DC offset and amplifying unit (203) carry out DC offset for this physiological signal through one-level amplification and the described analogue signal with DC bias signal are done difference, obtain DC offset signal, again secondary amplification is carried out to the signal after offsetting, control from the DC offset signal after secondary amplifies, to detect PACE ripple signal with digital signal processing module (2043);
Setting an amplitude intermediate value y, mV in amplitude [2mV, the 700mV] scope of input signal PACE, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, and the PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
2. PACE ripple checkout gear according to claim 1, it is characterized in that: described signal amplification unit (202) comprises the first differential signal amplification module (2022), the first difference turns single-end circuit module (2023), described first differential signal amplification module (2022) is connected with described signal gathering unit (201), and described first differential signal amplification module (2022) is for being enlarged into differential signal to the physiological signal with PACE ripple; Described first difference turns single-end circuit module (2023) and is connected with described DC offset and amplifying unit (203) with described first differential signal amplification module (2022), described analog-to-digital conversion module (2041) respectively, and described first difference turns single-end circuit module (2023) and exports to described analog-to-digital conversion module (2041) and described DC offset and amplifying unit (203) for differential signal being converted to single-ended signal.
3. PACE ripple checkout gear according to claim 2, it is characterized in that: described signal amplification unit (202) also comprises channel selecting module (2021), described channel selecting module (2021) is connected with described signal gathering unit (201), described first differential signal amplification module (2022) respectively, physiological signal for carrying out the switching of electrocardiac channel, and is transferred to described first differential signal amplification module (2022) by electrocardiac channel by described channel selecting module (2021).
4. PACE ripple checkout gear according to claim 3, is characterized in that: described channel selecting module (2021) comprises analog switch, and described analog switch is used for switching each electrocardiac channel.
5. PACE ripple checkout gear according to claim 1, it is characterized in that: described DC offset and amplifying unit (203) comprise subtractor (2031), the second differential signal amplification module (2032), the second difference turn single-end circuit module (2033), described subtractor is connected with described signal amplification unit (202) with described D/A converter module (2042) respectively, described subtractor is used for the physiological signal amplified through one-level and the described analogue signal with DC bias signal being done difference and carries out DC offset, obtains DC offset signal; Described second differential signal amplification module (2032) is connected with described subtractor (2031), for carrying out secondary amplification to DC offset signal; Described second difference turns single-end circuit module (2033) and is connected with described analog-to-digital conversion module (2041) with described signal amplification unit (202) respectively, and described second difference turns single-end circuit module (2033) and exports to described analog-to-digital conversion module (2041) for the differential signal after secondary amplification is converted to single-ended signal.
6. PACE ripple checkout gear according to claim 3, it is characterized in that: described control and digital signal processing module (2043) comprise PACE channel control module (20433), described PACE channel control module (20433) is connected with described channel selecting module (2021), and described PACE channel control module (20433) is selected for the switch exporting PACE passage.
7. the PACE ripple checkout gear according to any one of claim 1 to 6, it is characterized in that: described control and digital signal processing module (2043) comprise bandpass filtering modules block (20431), PACE characteristic parameter extraction module (20432), described bandpass filtering modules block (20431) is connected with described analog-to-digital conversion module (2041), described bandpass filtering modules block (20431) carries out digital filtering for the digital signal exported analog-to-digital conversion module (2041), extracts the PACE ripple signal in digital signal; Described PACE characteristic parameter extraction module (20432) is connected with described D/A converter module (2042) with described bandpass filtering modules block (20431) respectively, the PACE characteristic parameter of extraction for carrying out extraction PACE characteristic parameter to PACE ripple signal, and is transferred to described D/A converter module (2042) by described PACE characteristic parameter extraction module (20432).
8. use PACE ripple checkout gear described in any one of claim 1 to 7 to carry out the method detected, it is characterized in that, comprise the steps:
A. signals collecting, obtains the physiological signal with PACE ripple from human body by signal gathering unit (201);
B. one-level differential amplification, carries out one-level amplification by the physiological signal of signal amplification unit (202) to the simulation that described signal gathering unit (201) exports;
C. analog digital conversion, is converted to digital signal by analog-to-digital conversion module (2041) by the analogue signal that described signal amplification unit (202) exports;
D. judge that PACE ripple signal is strong and weak, if strong PACE ripple signal, so carry out date processing by described control and digital signal processing module (2043); If weak PACE ripple signal, so carries out secondary amplification procedure;
Described secondary amplification procedure comprises the steps:
The first step: DC offset and secondary amplify, DC bias signal in weak PACE ripple signal is converted to analogue signal through D/A converter module (2042) by described control and digital signal processing module (2043), and by this analog signal output to DC offset and amplifying unit (203), and control with digital signal processing module (2043) control described signal amplification unit (202) one-level is amplified after physiological signal export to described DC offset and amplifying unit (203), physiological signal after described DC offset and amplifying unit (203) amplify by the one-level that signal amplification unit (202) exports deducts the DC bias signal that described D/A converter module (2042) exports and carries out DC offset, obtain DC offset signal, again secondary amplification is carried out to the signal after counteracting,
Second step: analog digital conversion, the analogue signal through secondary amplification described DC offset and amplifying unit (203) exported by analog-to-digital conversion module (2041) is converted to digital signal;
3rd step: Digital Signal Processing, carries out detection PACE ripple signal by described control and digital signal processing module (2043) to the digital signal that described analog-to-digital conversion module (2041) exports;
Setting an amplitude intermediate value y, mV in amplitude [2mV, the 700mV] scope of input signal PACE, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, and the PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
9. method according to claim 8, is characterized in that: described date processing comprises digital filtering, filters low-and high-frequency noise, filters out electrocardiosignal, realizes the extraction to PACE ripple signal, extracts PACE characteristic parameter further to the PACE ripple signal extracted.
10. method according to claim 9, is characterized in that: described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
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| CN111490784B (en) * | 2020-04-23 | 2023-05-02 | 全球能源互联网研究院有限公司 | Analog-to-digital converter and analog-to-digital conversion method |
| CN114600050A (en) * | 2020-09-30 | 2022-06-07 | 焦旭 | Multi-signal parallel acquisition circuit, electronic device and body characteristic signal acquisition instrument |
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