CN202005762U - Program-controlled amplifying and filtering device for heart sound signal acquisition - Google Patents
Program-controlled amplifying and filtering device for heart sound signal acquisition Download PDFInfo
- Publication number
- CN202005762U CN202005762U CN2011200571495U CN201120057149U CN202005762U CN 202005762 U CN202005762 U CN 202005762U CN 2011200571495 U CN2011200571495 U CN 2011200571495U CN 201120057149 U CN201120057149 U CN 201120057149U CN 202005762 U CN202005762 U CN 202005762U
- Authority
- CN
- China
- Prior art keywords
- program control
- filtering device
- signal
- cardiechema signals
- program
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
A program-controlled amplifying and filtering device for heart sound signal acquisition is characterized in that a heart-sound sensor, a program-controlled amplifying and filtering device, an analog-to-digital conversion device and a central processing unit are included; the heart-sound sensor acquires the heart-sound signal and transmits the signal to the program-controlled amplifying and filtering device, the program-controlled amplifying and filtering device improves the accuracy, filters the noises and transmits the processed signal to the analog-to-digital conversion device for analog-to-digital conversion; the analog-to-digital conversion device transmits the processed signal to the central processing unit, and the central processing unit is further connected with the program-controlled amplifying and filtering device. In the utility model, based on such advanced technologies as electronic information technology and data processing technology, the accuracy and reliability of the signal heart sound acquisition can be improved through an analog signal processing circuit which can realize heart sound signal acquisition through the program-controlled amplifying and controlling device, and design flexibility of heart-sound signal acquisition equipment is increased.
Description
Technical field:
This utility model relates to the cardiechema signals process field, specifically is that a kind of cardiechema signals is gathered program control amplification filtering device.
Background technology:
Hear sounds is one of most important physiological signals, is a kind of basic skills of clinical assessment systema cariovasculare functional state, is the reflection of heart and trunk mechanical movement situation.Cardiechema signals has comprised the abundant information that can reflect the normal or pathology of heart; normal hear sounds comprises first heart sound (S1), second heart sound (S2), third heart sound (S3) and four hear sounds compositions of fourth heart sound (S4); wherein S1, S2 are the parts that can hear; S3, S4 intensity are very weak, can hear hardly.If cardiac function occurs unusual or pathological changes appears in cardiovascular; to comprise other the outer noise compositions except that S1, S2 in the hear sounds; important diagnostic information such as the noise of these appearance and distortion can reflect that cardiovascular disease still is difficult to produce clinical and pathological change symptom in the past with some.Comprised these abundant information in the cardiechema signals, in the field of detecting the type disease, cardiechema signals has unrivaled superiority.Simultaneously easy to detect, the noinvasive of cardiechema signals, cost are minimum, can be used as that heart disease detects, the conventional means of prevention.Yet traditional cardiac auscultation technology is carried out with people's ear audition, and this mode depends on the sensitivity of people's ear audition and hearer's subjective experience and judgement, and its effect has significant limitation.
Because the intensity of cardiechema signals can have bigger variation along with the body constitution of disease type and different people, the signal quality that causes heart sound transducer to obtain is difficult to guarantee clinically.When cardiechema signals is more weak, cause analog digital conversion Signal-to-Noise reduction afterwards, can't guarantee the requirement of subsequent segment and diagnosis algorithm Signal-to-Noise.If overflow will cause the distortion of cardiechema signals near the peak value of signal, will cause subsequent treatment to finish when serious.Can adopt the amplifier of the big linearity and the problem that high-precision analog-digital converter overcomes the front, but this can increase the cost of equipment undoubtedly greatly.And cardiechema signals intensity itself also is one of key character of cardiechema signals, and therefore traditional automatic gain control circuit is used in hear sounds to gather the field also incompatible.
Summary of the invention:
The purpose of this utility model is exactly big and to the difficulty that signals collecting causes in order to overcome the cardiechema signals Strength Changes, provides a kind of cardiechema signals that the moderate and real cardiechema signals intensity of energy can obtain accurately when making signal arrive analog-digital commutator by program control amplification filtering device to gather program control amplification filtering device.
This utility model comprises: heart sound transducer is gathered cardiechema signals and is transferred to program control amplification filtering device, program control amplification filtering device improves the processing of precision and filtering noise to signal, and the signal after will handling is transferred to analog-digital commutator and carries out analog digital conversion, and the signal after analog-digital commutator will be changed is transferred to central processing unit; Central processing unit also connects the program control amplification filtering device of control.Program control amplification filtering device can carry out pretreatment to cardiechema signals between heart sound transducer and analog-digital commutator, improve the precision and the filtering partial noise of signals collecting.
And can effectively control by the adaptive electric-level gain that program control amplification filtering device is set of central processing unit, can adjust at different people's intensity of heart sounds situation like this, improve the signals collecting quality and prevent distorted signals.And the hear sounds regulation can assess by central processing unit, can realize the coupling of acquired signal scope and analog digital conversion scope by this device.Program control amplification filtering device can be provided with filter patterns (low pass, high pass, logical, the band resistance of band) flexibly by central processing unit, bandwidth, band connection frequency, stop-band frequency etc. can be set flexibly, and the self adaptation setting of carrying out filtering at different collection environment can effectively be improved the quality of cardiechema signals.
Further, described program control amplification filtering device comprises connection successively: the pretreatment amplifying device of the Signal Matching between realization and the heart sound transducer, realize the program control filtering device of the out-of-band noise filtering of signal, further realize the Signal Matching amplifying device of the amplification/compression of signal.
Signal Matching between above-mentioned pretreatment amplifying device realization and the heart sound transducer accurately is controlled at the decentraction tone signal in the best required level range of wave filter by self-adapting program control, to reach best filter effect.This amplifier should have low noise, high cmrr, low level drift, but characteristics such as programme-control.Its realization is easy, has multiple scheme, for example: be integrated gain-programmed amplifier (as AD603) to have advantages such as the high and low drift of integrated level, low nonlinearity, high cmrr and broadband; Perhaps be integrated operational amplifier (for example AD620) and program control resistor network (for example ad5231) (or digital regulation resistance), have and be provided with flexibly, characteristics such as device is abundant.
Above-mentioned program control filtering device is realized the filtering work of the out-of-band noise of signal, can be provided with as required that mode of operation such as low pass, high pass, band are logical, band resistance etc., and can set parameters such as band connection frequency, stop-band frequency, the filtering different types of noise realizes the reliable collection of cardiechema signals in varying environment.Its realization is easy, has multiple scheme, for example: realize (as MAX262) by integrated program control filtering circuit, MAX262 can finish direct current by the change input clock frequency and pass to and design of band-stop filter to high pass, low pass, band in the 170KHz frequency range, and peripheral circuit is simple in structure, and programme-control is convenient; Perhaps realize programmable filter by integrated operational amplifier (AD620) and switching capacity.
Above-mentioned Signal Matching amplifying device makes the later signal of filtering can be fit to analog-to-digital scope, can be fixedly low noise, the low drifting operating amplifier of amplification.
Further, be connected with the signal quality apparatus for evaluating with described pretreatment amplifying device and program control filtering device, the signal quality apparatus for evaluating is by weighing and assess indexs such as the intensity of the cardiechema signals that collects and signal to noise ratios, produce the control signal of amplification and filter, and write down the intensity and the signal to noise ratio index of original cardiechema signals.
Above-mentioned signal quality apparatus for evaluating can be realized for central processing unit or by an one-chip computer module, realize the assessment of signal quality.
Further, be connected with display device, can show various data with described central processing unit.
The cardiechema signals that this utility model provides is gathered program control amplification filtering device and is utilized advanced technologies such as electronic information technology, data processing technique, realize the analog signal processing circuit that cardiechema signals is gathered by program control amplification filtering device, improve precision and reliability that cardiechema signals is gathered, increased the design flexibility of cardiechema signals collecting device.
Description of drawings:
Fig. 1 is the electrical schematic diagram of this utility model embodiment;
Fig. 2 is the electrical schematic diagram of program control amplification filtering device among Fig. 1;
Fig. 3 is the electrical schematic diagram of pretreatment amplifying device among the embodiment;
Fig. 4 is the electrical schematic diagram of program control filter among the embodiment.
The specific embodiment
Embodiment with indefiniteness further explains, illustrates the technical program below.
A kind of cardiechema signals is gathered program control amplification filtering device, as shown in Figures 1 and 2, heart sound transducer is gathered cardiechema signals and is transferred to program control amplification filtering device, program control amplification filtering device improves the processing of precision and filtering noise to signal, and the signal after will handling is transferred to analog-digital commutator and carries out analog digital conversion, and the signal after analog-digital commutator will be changed is transferred to central processing unit; Central processing unit also connects the program control amplification filtering device of control, and central processing unit is connected with display device.
Program control amplification filtering device comprises connection successively: the pretreatment amplifying device of the Signal Matching between realization and the heart sound transducer, realize the program control filtering device of the out-of-band noise filtering of signal, further realize the Signal Matching amplifying device of the amplification/compression of signal.Be connected with the signal quality apparatus for evaluating with described pretreatment amplifying device and program control filtering device, by the cardiechema signals that collects being assessed the control signal that produces pretreatment amplifying device and program control filtering device, the signal quality apparatus for evaluating is a central processing unit in this example, utilize the central processing unit deal with data, the assessment that realizes signal quality is a prior art, is not giving unnecessary details.
The realization of pretreatment amplifying device is easy, for example as shown in Figure 3, adopts integrated operational amplifier AD620 and program control resistor network ad5231; The realization of program control filtering device is easy, for example as shown in Figure 4, adopts switched capacitor network and integrated operational amplifier AD620.
During acquired signal, heart sound transducer is gathered cardiechema signals, be transferred to the pretreatment amplifying device and carry out pretreatment, again pretreated signal is transferred to the filtering that the program control filtering device carries out out-of-band noise, further amplifies by the Signal Matching amplifying device again, make the later signal of filtering can be fit to analog-to-digital scope, carry out analog digital conversion again, and data after A is transferred to central processing unit assesses, collect suitable cardiechema signals, and can show by display device.
Claims (8)
1. a cardiechema signals is gathered program control amplification filtering device, it is characterized in that comprising: heart sound transducer is gathered cardiechema signals and is transferred to program control amplification filtering device, program control amplification filtering device improves the processing of precision and filtering noise to signal, and the signal after will handling is transferred to analog-digital commutator and carries out analog digital conversion, and the signal after analog-digital commutator will be changed is transferred to central processing unit; Central processing unit also connects the program control amplification filtering device of control.
2. cardiechema signals according to claim 1 is gathered program control amplification filtering device, it is characterized in that: described program control amplification filtering device comprises successively and to connect: realize and heart sound transducer between the pretreatment amplifying device of Signal Matching, realize the program control filtering device of the out-of-band noise filtering of signal, further realize the Signal Matching amplifying device of the amplification/compression of signal.
3. cardiechema signals according to claim 2 is gathered program control amplification filtering device, it is characterized in that: described pretreatment amplifying device is integrated gain-programmed amplifier or is integrated operational amplifier and program control resistor network.
4. cardiechema signals according to claim 2 is gathered program control amplification filtering device, it is characterized in that: described program control filtering device is integrated program control filtering circuit or is the programmable filter that integrated operational amplifier and switching capacity are formed.
5. cardiechema signals according to claim 2 is gathered program control amplification filtering device, it is characterized in that: described Signal Matching amplifying device is the fixing operational amplifier of amplification.
6. gather program control amplification filtering device according to claim 2 or 3 or 4 or 5 described cardiechema signals, it is characterized in that: be connected with the signal quality apparatus for evaluating with described pretreatment amplifying device and program control filtering device, by the cardiechema signals that collects being assessed the control signal that produces pretreatment amplifying device and program control filtering device.
7. cardiechema signals according to claim 6 is gathered program control amplification filtering device, it is characterized in that: described signal quality apparatus for evaluating is central processing unit or is an one-chip computer module.
8. gather program control amplification filtering device according to claim 1 or 7 described cardiechema signals, it is characterized in that: be connected with display device with described central processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200571495U CN202005762U (en) | 2011-03-07 | 2011-03-07 | Program-controlled amplifying and filtering device for heart sound signal acquisition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200571495U CN202005762U (en) | 2011-03-07 | 2011-03-07 | Program-controlled amplifying and filtering device for heart sound signal acquisition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202005762U true CN202005762U (en) | 2011-10-12 |
Family
ID=44747426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200571495U Expired - Fee Related CN202005762U (en) | 2011-03-07 | 2011-03-07 | Program-controlled amplifying and filtering device for heart sound signal acquisition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202005762U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104778342A (en) * | 2014-01-14 | 2015-07-15 | 济南大学 | Heart sound characteristic extraction method based on wavelet singularity entropy |
| CN112350687A (en) * | 2020-10-29 | 2021-02-09 | 天津飞旋科技有限公司 | Hardware filtering device, method and system |
-
2011
- 2011-03-07 CN CN2011200571495U patent/CN202005762U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104778342A (en) * | 2014-01-14 | 2015-07-15 | 济南大学 | Heart sound characteristic extraction method based on wavelet singularity entropy |
| CN104778342B (en) * | 2014-01-14 | 2017-12-15 | 济南大学 | A kind of heart sound feature extracting method based on wavelet singular entropy |
| CN112350687A (en) * | 2020-10-29 | 2021-02-09 | 天津飞旋科技有限公司 | Hardware filtering device, method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103405228B (en) | A kind of portable cardiac and surface myoelectric measuring device | |
| CN203555751U (en) | Abdomen bowel sound analyzer system based on time-frequency analysis | |
| CN201211186Y (en) | Anti-interference bioelectric signal recording electrode | |
| CN106073764A (en) | Reduce the method and device of dynamic electrocardiogram (ECG) data recording equipment power consumption | |
| CN108574892A (en) | Sound pick-up, pick up facility and the method for eliminating noise | |
| CN104510461B (en) | Digital full isolation ecg signal acquiring denoising device and its method | |
| CN102008316B (en) | Auscultation sound spectrum analysis-based multifunctional digital stethoscope circuit | |
| CN202005762U (en) | Program-controlled amplifying and filtering device for heart sound signal acquisition | |
| CN201542630U (en) | Novel electrocardio-recorder | |
| CN204468044U (en) | A kind of heart sound signal acquisition system | |
| CN110464335A (en) | Cardioelectric monitor wrist-watch, switching system and switching method | |
| CN1488319A (en) | Multifunctional electronic stethoscope | |
| CN106510691A (en) | Electrocardiograph signal acquisition front end | |
| CN204708842U (en) | Portable cardiac monitoring equipment | |
| CN108451548A (en) | A kind of fetal rhythm voice handling method, device and a kind of fetal heart sound detection device | |
| CN204181640U (en) | Multi-purpose electronic stethoscope | |
| CN103977503B (en) | A kind of PACE ripple checkout gear of low cost and method | |
| CN203693631U (en) | Intelligent online heart sound collection and analysis device | |
| CN215017832U (en) | Heart sound electrocardiosignal collection system based on FPGA | |
| CN110840436A (en) | Method, device and terminal for acquiring electrocardiosignals and computer readable storage medium | |
| CN213070619U (en) | Noise removing circuit of stethoscope | |
| CN113208606A (en) | Analog front end AFE circuit for EEG signal acquisition | |
| CN205795671U (en) | Pulse detector | |
| CN113208612A (en) | Differential output instrument amplifier | |
| CN217285813U (en) | Analog front end AFE circuit for EEG signal acquisition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111012 Termination date: 20130307 |