CN103977503A - PACE wave detection device and method low in cost - Google Patents
PACE wave detection device and method low in cost Download PDFInfo
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- CN103977503A CN103977503A CN201410208947.1A CN201410208947A CN103977503A CN 103977503 A CN103977503 A CN 103977503A CN 201410208947 A CN201410208947 A CN 201410208947A CN 103977503 A CN103977503 A CN 103977503A
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Abstract
The invention provides a PACE wave detection device and method low in cost. The PACE wave detection device comprises a signal collection unit (201), a signal amplification unit (202), a direct-current offset and amplification unit (203) and a PACE wave intelligent detection unit (204), wherein the signal collection unit (201) is used for obtaining electrocardio and PACE wave mixed signals from the human body; the PACE wave intelligent detection unit (204) comprises an analog-digital conversion module (2041) having the low-order digit and the high sampling rate. The PACE wave detection device and method have the advantages that a two-level amplifier circuit and a direct-current offset circuit are used and are matched with software to ingeniously achieve detection on PACE waves by a low-order digit analog-digital converter, cost of hardware is reduced to a great degree, and meanwhile high-reliability PACE wave detection is guaranteed.
Description
Technical field
The present invention relates to field of medical, relate in particular to one PACE ripple checkout gear and method cheaply.
Background technology
Some cardiac's body has been implanted into cardiac pacemaker, and cardiac pacemaker produces electric pulse and triggers heartbeat, maintains blood samples of patients and flows, and to sustain life, cardiac pacemaker produces electric pulse and is medically being referred to as PACE ripple.The measured circuit of PACE ripple and electro-physiological signals detects simultaneously, if PACE accurately cannot be identified, will cause electrocardio measuring error; In the time that PACE wave amplitude is larger, PACE ripple also can be modulated onto on respiratory wave, affects respiratory waveform.
According to ANSI/AAMI EC13:2002 standard, monitor PACE wave amplitude is ± 2mV～± 700mV that polarizing voltage input range is ± 300mV that electrocardiosignal amplitude is ± 5mV.Exceed ± 1V of three's sum signal amplitude maximum, so wide signal amplitude scope, if hardware circuit carries out high multiple amplification to signal, in the time that PACE amplitude is larger, circuit just there will be saturated so, causes PACE ripple to detect unsuccessfully.If the mode that therefore adopts low multiple to amplify detects PACE ripple, will improve the figure place of analog-digital converter (ADC), certainly will improve so the cost of analog-digital converter.
Summary of the invention
In order to solve the problems of the prior art, the invention provides one PACE ripple checkout gear cheaply.
The invention provides one PACE ripple checkout gear cheaply, comprise signal gathering unit, signal amplification unit, DC offset and amplifying unit, PACE ripple intelligent detection unit, described signal gathering unit is 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 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 amplifying 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 of described analog-to-digital conversion module output;
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 direct current biasing signal of controlling with digital signal processing module output, and this digital signal is converted to the analogue signal with direct current biasing signal, and give described DC offset and amplifying unit by this analog signal transmission;
Described control and digital signal processing module are for obtaining the simulation physiological signal of signal amplification unit transmission through the digital signal of AD conversion unit conversion, and extract the PACE ripple signal in this digital signal, and judge PACE ripple signal power, if strong PACE ripple signal, directly carries out date processing to this digital signal; If weak PACE ripple signal, control with digital signal processing module and from this digital signal, extract direct current biasing signal, and control analogue signal that this direct current biasing 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 for by this physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification, control and the detection PACE ripple signal of digital signal processing module from the DC offset signal secondary amplification;
In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, the 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 that the first differential signal amplification module, the first difference turn single-end circuit module, described the first differential signal amplification module is connected with described signal gathering unit, and described the first differential signal amplification module is for being enlarged into differential signal to the physiological signal with PACE ripple; Described the first difference turns single-end circuit module and is connected with described DC offset and amplifying unit with described the first differential signal amplification module, described analog-to-digital conversion module respectively, and described the 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 the first differential signal amplification module respectively, described channel selecting module is used for carrying out the switching of electrocardiac channel, and physiological signal is transferred to described the first differential signal amplification module by electrocardiac channel.
As a further improvement on the present invention, described channel selecting module comprises analog switch, and described analog switch is for switching each electrocardiac channel.
As a further improvement on the present invention, described DC offset and amplifying unit comprise that 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 for by the physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, acquisition DC offset signal; Described the second differential signal amplification module is connected with described subtractor, for DC offset signal is carried out to secondary amplification; Described the 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 the 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 passage control module, described PACE passage control module is connected with described channel selecting module, and described PACE passage control module is selected for the switch of 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, described bandpass filtering modules block, for the digital signal of analog-to-digital conversion module output is carried out to digital filtering, is extracted 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 PACE ripple signal to extract PACE characteristic parameter, and the PACE characteristic parameter of extraction is transferred to described D/A converter module.
The present invention also provides a kind of method that uses described PACE ripple checkout gear to detect, and comprises the steps:
A. signals collecting, obtains the physiological signal with PACE ripple from human body by signal gathering unit;
B. one-level differential amplification, the physiological signal of the simulation by signal amplification unit to described signal gathering unit output carries out one-level amplification;
C. analog digital conversion, is converted to digital signal by analog-to-digital conversion module by the analogue signal of described signal amplification unit output;
D. judge PACE ripple signal power, if strong PACE ripple signal carries out date processing by described control and digital signal processing module so; If weak PACE ripple signal, carries out secondary amplification procedure so;
Described secondary amplification procedure comprises the steps:
The first step: DC offset and secondary amplify, described control and digital signal processing module are converted to analogue signal by the direct current biasing value signal in weak PACE ripple signal through D/A converter module, and by this analog signal output to DC offset and amplifying unit, and described in control and digital signal processing module control, the physiological signal after one-level amplification is exported to described DC offset and amplifying unit by signal amplification unit, the dc-bias that physiological signal after described DC offset and amplifying unit amplify by the one-level of signal amplification unit output deducts described D/A converter module output carries out DC offset, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification,
Second step: analog digital conversion, is converted to digital signal by analog-to-digital conversion module by the analogue signal of amplifying through secondary of described DC offset and amplifying unit output;
The 3rd step: Digital Signal Processing, detects PACE ripple signal by described control and digital signal processing module to the digital signal of described analog-to-digital conversion module output;
In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, the 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, and the PACE ripple signal extracting is further extracted to PACE characteristic parameter.
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 realize cleverly the detection of lower-order digit analog-digital converter to PACE ripple, greatly the reduction of degree hardware cost, ensured that the PACE ripple of high reliability detects simultaneously.
Brief description of the drawings
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 one PACE ripple checkout gear cheaply, 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 amplifying through one-level;
Described PACE ripple intelligent detection unit 204 comprises analog-to-digital conversion module 2041, D/A converter module 2042, control 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, is converted to digital signal for the physiological signal of the simulation respectively described signal amplification unit 202 and described DC offset and amplifying unit 203 transmitted; Described analog-to-digital conversion module 2041 figure places are for being less than or equal to 12, and described analog-to-digital conversion module 2041 sample rates are 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, the digital signal of exporting for receiving described analog-to-digital conversion module 2041;
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, control for receiving the digital signal with direct current biasing signal of exporting with digital signal processing module 2043, and this digital signal is converted to the analogue signal with direct current biasing signal, and give described DC offset and amplifying unit 203 by this analog signal transmission;
Described control and digital signal processing module 2043 be the digital signal through AD conversion unit conversion for the simulation physiological signal that obtains signal amplification unit 202 and transmit, and extract the PACE ripple signal in this digital signal, and judge PACE ripple signal power, if strong PACE ripple signal, directly carries out date processing to this digital signal; If weak PACE ripple signal, control with digital signal processing module 2043 and from this digital signal, extract direct current biasing signal, and control analogue signal that this direct current biasing 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 for by this physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification, control and the detection PACE ripple signal of digital signal processing module 2043 from the DC offset signal secondary amplification;
In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, the PACE ripple signal within the scope of [y, 700] mV is strong PACE ripple signal.
Signal gathering unit 201 is obtained 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 inputs connect respectively signal amplification unit 202 and DC offset and amplifying unit 203, which signal this analog-to-digital conversion module 2041, for 2 tunnel analogue signals are converted to respectively to digital signal, specifically use carry out Digital Signal Processing and determines by controlling 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 that the PACE ripple deration of signal that need to detect is 0.1ms～2ms, therefore must improve as much as possible sample rate.
D/A converter module 2042 is for being converted to analogue signal controlling the direct current biasing digital signal of exporting with digital signal processing module 2043.
Control with digital signal processing module 2043 signal after analog digital conversion is carried out to Digital Signal Processing, and realize the control of circuit.
As shown in Figure 2, described signal amplification unit 202 comprises that the first differential signal amplification module 2022, the first difference turn single-end circuit module 2023, described the first differential signal amplification module 2022 is connected with described signal gathering unit 201, and described the first differential signal amplification module 2022 is for being enlarged into differential signal to the physiological signal with PACE ripple; Described the first difference turns single-end circuit module 2023 and is connected with described the first differential signal amplification module 2022, described analog-to-digital conversion module 2041 and described DC offset and amplifying unit 203 respectively, and described the 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 the first differential signal amplification module 2022 respectively, described channel selecting module 2021 is for carrying out the switching of electrocardiac channel, and physiological signal is transferred to described the first differential signal amplification module 2022 by electrocardiac channel; 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 are controlled the switching of electrocardiac channel.
Described channel selecting module 2021 comprises analog switch, and described analog switch is 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, realized a circuit task of completing multi-channel detection.
The 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 and separating completely of electrocardiosignal are realized by software, further save circuit structure and reduce costs; The gain of this difference amplifier is x1.
Consider that MCU chip does not generally have signal differential input, transfers single-ended input signal so turn single-end circuit module 2023 by the first difference to differential signal.
As shown in Figure 3, described DC offset and amplifying unit 203 comprise that 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 for by the physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, acquisition DC offset signal; Described the second differential signal amplification module 2032 is connected with described subtractor 2031, for DC offset signal is carried out to secondary amplification; Described the 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 the 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 is weak PACE ripple signal to be carried out to secondary be amplified in suitable scope, and the weak PACE ripple signal of guarantee significantly gamut can detect.
The D. C. value that subtractor 2031 is exported for cutting D/A converter module 2042, the DC component in bucking circuit, prevents that to amplify the circuit causing saturated due to DC component, expands the dynamic range of circuit.
The 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 realized by software; The gain of this difference amplifier is x2.
The 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 passage control module 20433, described PACE passage control module 20433 is connected with described channel selecting module 2021, and described PACE passage control module 20433 is selected for the switch of 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 is carried out digital filtering for the digital signal that analog-to-digital conversion module 2041 is exported, 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, described PACE characteristic parameter extraction module 20432 is for PACE ripple signal is extracted to PACE characteristic parameter, and the PACE characteristic parameter of extraction is transferred to described D/A converter module 2042; Described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
Direct current biasing acquisition methods is: the initial data that analog-to-digital conversion module 2041 carries out after analog digital conversion cuts after PACE ripple signal, calculates the meansigma methods of signal in a period of time.
As shown in Figure 5, the invention also discloses a kind of method that uses described PACE ripple checkout gear to detect, comprise the steps:
In step S1, 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, very wide of scope, in method of the present invention, at the amplitude [2mV of input signal PACE, 700mV] the interior amplitude intermediate value y that sets of scope, 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.
The strong PACE ripple signal below mentioned, weak PACE ripple signal refers in particular to the specific PACE ripple signal in above scope.
In step S2, one-level differential amplification, the physiological signal of described signal gathering unit 201 being exported by signal amplification unit 202 carries out one-level amplification;
In step S2, carrying out one-level amplification is X1, after one-level is amplified, the mixed signal of strong PACE ripple superimposed signal circuit DC component neither can saturated (showing as the maximum output area that voltage amplitude exceedes circuit), gamut has obtained larger amplitude again, after analog digital conversion, can obtain extraordinary signal accuracy, 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, the analogue signal of described signal amplification unit 202 being exported by analog-to-digital conversion module 2041 is converted to digital signal;
In step S4, judge PACE ripple signal power, if strong PACE ripple signal carries out date processing by described control and digital signal processing module 2043 so; If weak PACE ripple signal, carries out secondary amplification procedure so.
In step S4, software, to the digital signal amplitude judgement collecting after one-level is amplified, if amplitude in [2, y], is judged as weak PACE ripple signal, need to further amplify, and carries out secondary amplification procedure; If amplitude is judged as strong PACE ripple signal in [y, 700mV] scope, can directly carry out date processing.
Secondary amplification procedure comprises the steps:
In step W1: DC offset and secondary amplify, described control and digital signal processing module 2043 are converted to analogue signal by the direct current biasing value signal in weak PACE ripple signal through D/A converter module 2042, and by this analog signal output to DC offset and amplifying unit 203, and the physiological signal that control and digital signal processing module 2043 are controlled after described signal amplification unit 202 amplifies one-level is exported to described DC offset and amplifying unit 203, physiological signal after one-level that described DC offset and amplifying unit 203 use signal amplification units 202 are exported is amplified deducts the dc-bias that described D/A converter module 2042 exports and carries out DC offset, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification,
In step W2: analog digital conversion, the analogue signal of amplifying through secondary of described DC offset and amplifying unit 203 being exported by analog-to-digital conversion module 2041 is converted to digital signal;
In step W3: Digital Signal Processing, the digital signal of described analog-to-digital conversion module 2041 being exported by described control and digital signal processing module 2043 detects PACE ripple signal.
In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, the 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, and the PACE ripple signal extracting is further extracted to PACE characteristic parameter.
Described PACE characteristic parameter comprises rise/fall edge, pulse width, PACE amplitude and signal direct current biasing.
In secondary amplification procedure, the weak PACE ripple signal collecting is carried out to second level amplification, amplification is X2, for weak PACE ripple signal, because amplitude is too small, even amplify through one-level, the signal accuracy that uses the analog-digital converter of lower-order digit to gather is still inadequate, cannot directly carry out Digital Signal Processing; The secondary amplification of weak PACE ripple signal demand is larger, therefore, before amplifying, the DC component of system need to be balanced out, to improve the dynamic range of circuit; The multiple that secondary amplifies is X2, choosing of X2 need 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, after being input to lower-order digit analog-digital converter, can obtain good signal accuracy, after secondary amplifies, can ensure that weak PACE ripple signal gamut can detect.
Beneficial effect: the present invention adopts the mode of software and hardware combining to detect PACE ripple, software switches to the electrocardiac channel that need to detect PACE by multiway analog switch, by low multiple signal amplification unit 202, signal is amplified to (being referred to as first order amplifying circuit) thereupon, after amplifying, pass through lower-order digit, the analog-to-digital conversion module 2041 of high sampling rate gathers, software is processed the signal collecting, and contrast PACE wave characteristic, if meet PACE wave characteristic, PACE ripple just detects at first order amplifying circuit so, 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, the signal of first order amplifying circuit output is by the DC component (being polarizing voltage) in the DC offset by being measured by software control counteracting and amplifying unit 203 offseting signals so, and by high multiple amplifying circuit, signal is amplified to (being referred to as second level amplifying circuit), finally pass through lower-order digit, the analog-to-digital conversion module 2041 of high sampling rate gathers, software is processed the signal collecting, and contrast PACE wave characteristic, can obtain the PACE ripple of low amplitude.Being used in conjunction with of first order amplifying circuit and second level amplifying circuit and software ensured that PACE ripple can be detected in gamut.
Two-stage amplifying circuit used in the present invention and DC offset circuit coordinate software to realize cleverly the detection of lower-order digit analog-digital converter to PACE ripple, greatly the reduction of degree hardware cost, ensured 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, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a PACE ripple checkout gear cheaply, 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 amplifying through one-level;
Described PACE ripple intelligent detection unit (204) comprises analog-to-digital conversion module (2041), D/A converter module (2042), control 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, for respectively the physiological signal of the simulation of described signal amplification unit (202) and described DC offset and amplifying unit (203) transmission being 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 of described analog-to-digital conversion module (2041) output;
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, be used for receiving the digital signal with direct current biasing signal of controlling with digital signal processing module (2043) output, and this digital signal is converted to the analogue signal with direct current biasing signal, and give described DC offset and amplifying unit (203) by this analog signal transmission;
Described control and digital signal processing module (2043) are for obtaining the simulation physiological signal of signal amplification unit (202) transmission through the digital signal of AD conversion unit conversion, and extract the PACE ripple signal in this digital signal, and judge PACE ripple signal power, if strong PACE ripple signal, directly carries out date processing to this digital signal; If weak PACE ripple signal, control with digital signal processing module (2043) and from this digital signal, extract direct current biasing signal, and control analogue signal that this direct current biasing 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) for by this physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification, control and the detection PACE ripple signal of digital signal processing module (2043) from the DC offset signal secondary amplification; In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, 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 that the first differential signal amplification module (2022), the first difference turn single-end circuit module (2023), described the first differential signal amplification module (2022) is connected with described signal gathering unit (201), and described the first differential signal amplification module (2022) is for being enlarged into differential signal to the physiological signal with PACE ripple; Described the first difference turns single-end circuit module (2023) and is connected with described the first differential signal amplification module (2022), described analog-to-digital conversion module (2041) and described DC offset and amplifying unit (203) respectively, and described the 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 the first differential signal amplification module (2022) respectively, described channel selecting module (2021) is for carrying out the switching of electrocardiac channel, and physiological signal is transferred to described the first differential signal amplification module (2022) by electrocardiac channel.
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 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 that 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 for by the physiological signal amplifying through one-level with described in there is direct current biasing signal analogue signal do the poor DC offset that carries out, acquisition DC offset signal; Described the second differential signal amplification module (2032) is connected with described subtractor (2031), for DC offset signal is carried out to secondary amplification; Described the 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 the 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 passage control module (20433), described PACE passage control module (20433) is connected with described channel selecting module (2021), and described PACE passage control module (20433) is selected for the switch of exporting PACE passage.
7. according to the PACE ripple checkout gear described in claim 1 to 6 any one, 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), for the digital signal of analog-to-digital conversion module (2041) output is carried out to digital filtering, is extracted 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, described PACE characteristic parameter extraction module (20432) is for PACE ripple signal is extracted to PACE characteristic parameter, and the PACE characteristic parameter of extraction is transferred to described D/A converter module (2042).
8. the method that described in right to use requirement 1 to 7 any one, PACE ripple checkout gear detects, is characterized in that, comprises the steps:
A. signals collecting, obtains the physiological signal with PACE ripple by signal gathering unit (201) from human body;
B. one-level differential amplification, the physiological signal of the simulation by signal amplification unit (202) to described signal gathering unit (201) output carries out one-level amplification;
C. analog digital conversion, is converted to digital signal by analog-to-digital conversion module (2041) by the analogue signal of described signal amplification unit (202) output;
D. judge PACE ripple signal power, if strong PACE ripple signal carries out date processing by described control and digital signal processing module (2043) so; If weak PACE ripple signal, carries out secondary amplification procedure so;
Described secondary amplification procedure comprises the steps:
The first step: DC offset and secondary amplify, described control and digital signal processing module (2043) are converted to analogue signal by the direct current biasing value signal in weak PACE ripple signal through D/A converter module (2042), and by this analog signal output to DC offset and amplifying unit (203), and the physiological signal that control and digital signal processing module (2043) are controlled after described signal amplification unit (202) amplifies one-level is exported 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 of signal amplification unit (202) output deducts described D/A converter module (2042) output carries out DC offset, obtain DC offset signal, again the signal after offsetting is carried out to secondary amplification,
Second step: analog digital conversion, is converted to digital signal by analog-to-digital conversion module (2041) by the analogue signal of amplifying through secondary of described DC offset and amplifying unit (203) output;
The 3rd step: Digital Signal Processing, detects PACE ripple signal by described control and digital signal processing module (2043) to the digital signal of described analog-to-digital conversion module (2041) output;
In amplitude [2mV, the 700mV] scope of input signal PACE, set an amplitude intermediate value y, y ∈ [2,700] mV, the PACE ripple signal within the scope of [2, y] mV is weak PACE ripple signal, 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, and the PACE ripple signal extracting is further extracted to PACE characteristic parameter.
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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