CN104224225A - Heart sound signal acquisition system - Google Patents
Heart sound signal acquisition system Download PDFInfo
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- CN104224225A CN104224225A CN201410501006.7A CN201410501006A CN104224225A CN 104224225 A CN104224225 A CN 104224225A CN 201410501006 A CN201410501006 A CN 201410501006A CN 104224225 A CN104224225 A CN 104224225A
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- signal acquisition
- heart sound
- sound signal
- acquisition system
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Abstract
The invention relates to a signal acquisition system, in particular to a heart sound signal acquisition system. The heart sound signal acquisition system consists of a heart sound signal acquisition circuit, an A/D (analog/digital) conversion part, a USB (universal serial bus) communication part and an upper computer display part. The system can efficiently display an acquired heart sound signal in real time and fulfill the aim of seeing and hearing integration; an acquired signal is high in signal-to-noise ratio and is favorable for subsequent researches.
Description
Technical field
The present invention relates to a kind of signal acquiring system, be specifically related to a kind of heart sound signal acquisition system.
Background technology
Cardiechema signals is one of physiological signal of wanting of body weight for humans.Due to the mechanism of production of hear sounds, it can reflect the health status of cardiomotility, blood flow and heart well.Message examination and analysb accurately can judge cardiechema signals, finds cardiovascular disease ahead of time, is the indispensable means of one understanding heart and blood vessel state.But the many information containing cardiovascular pathological changes in cardiechema signals, the simple cardiac auscultation that relies on is difficult to judge that whether cardiovascular is healthy.The Electrocardioscopy of current extensive use is cardiac chronotropic and becomes conductive optimum detection method, but the inotropic native heart valve that can not detect heart is impaired.First the mechanical activity obstacle that electrocardio conducting tissue pathological changes causes can not be reflected in electrocardiosignal (ECG), but can first reflect on hear sounds, and therefore, hear sounds has the irreplaceable diagnostic message of electrocardiosignal.、
The lower process being unfavorable for the later stage of tone signal Acquire and process system noise on the market, or the transmission speed of the serial ports had is slow, simultaneously because now general computer does not exist serial ports, is unfavorable for promoting.
Summary of the invention
The present invention aims to provide a kind of real time signal aquisition system based on USB.
Technical program of the present invention lies in:
A kind of heart sound signal acquisition system, native system by the heart because of signal acquisition circuit, A/D change, usb communication and host computer display section form.
Preferably, described heart sound signal acquisition circuit comprises heart sound transducer, enlarge leadingly, low-pass filter circuit, intergrade amplifying circuit and earphone and exports.
More preferably, described intergrade amplifying circuit connects a rear class amplifying circuit.
Or preferably, described A/D conversion adopts STCl2C5A60S2 single-chip microcomputer as main control chip.
More preferably, described STCl2C5A60S2 series monolithic ADC is made up of multidiameter option switch, comparator, successively comparand register, 10bit DAC, transformation result depositor (ADC_RES and ADC_RESL) and ADC_CONTR.
Or preferably, described usb communication employing model is the USB chip of CH372.
Technique effect of the present invention is:
This system can show the cardiechema signals collected efficiently and in real time, and can reach the object of audiovisual unification, and the Signal-to-Noise obtained is high, is beneficial to follow-up research.
Accompanying drawing explanation
Fig. 1 is mechanism's block diagram of a kind of heart sound signal acquisition system of the present invention.
Detailed description of the invention
The signal utilizing homemade heart sound transducer to collect is millivolt level signal, tentatively amplify through pre-amplification circuit, low-pass filtering is carried out to the signal after amplifying, then amplify through intergrade, exported by earphone, because signal now only has hundreds of millivolt, for the ease of post-processed, through the adjustable amplification of rear class, volt level signal need be obtained and can be passed through the post-processed such as A/D.
Because cardiechema signals is very faint, and pre-amplification circuit is the first order of Detection of Weak Signals, is responsible for the task of small-signal being amplified, should reduces the observation noise introduced in measuring process as far as possible.Preamplifier is then one of critical piece introducing noise, so require that preamplifier should have good low-noise performance.Again because of process is suitable number of sound letter, so have chosen the OPA2134 operational amplifier with ultra-low-distortion low noise, also has the feature such as high input impedance, high cmrr low drifting simultaneously.
The signal obtained from preamplifying circuit is very faint, and the adulterate noise of auscultation head and clothes or skin friction and the mechanical noise of some high frequencies, so need to carry out filtering radio-frequency component by low pass filter.
Adopt the voltage-controlled type low-pass active filter of second order in design, compare firstorder filter, output voltage can be made at high band with speed decline faster, to improve filter effect.In order to make circuit stability work, the gain of wave filter should be less than 3.
Because the signal obtained from intergrade only has hundreds of millivolt, be not easy to the process in later stage, so added again one-level amplification here, the signal between-5 V to+5 V can be obtained, be convenient to A/D sampling.
Native system adopts STCl2C5A60S2 single-chip microcomputer as main control chip.This single-chip microcomputer carries 10,8 tunnel high-speed a/d converter, and speed can reach 250kHz (250,000 times/s).STCl2C5A60S2 series monolithic ADC is made up of multidiameter option switch, comparator, successively comparand register, 10bit DAC, transformation result depositor (ADC_RES and ADC_RESL) and ADC_CONTR.
The ADC of STCl2C5A60S2 series monolithic is successively comparison A/D C.Successively comparison A/D C is made up of a comparator and D/A converter, by successively CL Compare Logic, from highest order (MSB), sequentially exports each input voltage and built-in D/A converter and compares.Through repeatedly comparing, make the digital quantity Approach by inchmeal input analog amount respective value of conversion gained.Successively comparison A/D transducer has the advantages such as speed is high, low in energy consumption.
Adopt the USB chip CH372 of Nanjing Qin Heng company herein, this chip can realize the transmission speed of 1MB/s, at full speed USB device interface, and compatible USB V2.0, plug and play, peripheral component only needs crystal and electric capacity.A pair main side point and a pair assisted endpoint are provided, support controls transfer, bulk transfer, interrupt transfer, there is easy built-in firmware pattern and external firmware pattern flexibly.The usb protocol that built-in firmware patterned mask is relevant, the USB automatically completing standard enumerates layoutprocedure, do not need local side controller to do any process completely, simplify the firmware programs of single-chip microcomputer.STCl2C5A60S2 control CH372 is adopted to realize the usb communication of slave computer and host computer herein.
Claims (6)
1. a heart sound signal acquisition system, is characterized in that: native system by the heart because of signal acquisition circuit, A/D change, usb communication and host computer display section form.
2. as claim 1 heart sound signal acquisition system, it is characterized in that: described heart sound signal acquisition circuit comprises heart sound transducer, enlarge leadingly, low-pass filter circuit, intergrade amplifying circuit and earphone and exports.
3. as claim 2 heart sound signal acquisition system, it is characterized in that: described intergrade amplifying circuit connects a rear class amplifying circuit.
4. as claim 1 heart sound signal acquisition system, it is characterized in that: described A/D conversion adopts STCl2C5A60S2 single-chip microcomputer as main control chip.
5. as claim 4 heart sound signal acquisition system, it is characterized in that: described STCl2C5A60S2 series monolithic ADC is made up of multidiameter option switch, comparator, successively comparand register, 10bit DAC, transformation result depositor (ADC_RES and ADC_RESL) and ADC_CONTR.
6. as claim 1 heart sound signal acquisition system, it is characterized in that: described usb communication employing model is the USB chip of CH372.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410501006.7A CN104224225A (en) | 2014-09-26 | 2014-09-26 | Heart sound signal acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410501006.7A CN104224225A (en) | 2014-09-26 | 2014-09-26 | Heart sound signal acquisition system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104224225A true CN104224225A (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410501006.7A Pending CN104224225A (en) | 2014-09-26 | 2014-09-26 | Heart sound signal acquisition system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105982692A (en) * | 2015-04-29 | 2016-10-05 | 广东医学院附属医院 | Multifunctional stethoscope for broadband parameter monitoring and implementation method of multifunctional stethoscope |
| CN109199432A (en) * | 2018-06-26 | 2019-01-15 | 南京邮电大学 | A kind of parallelly compressed cognitive method of Multi-path synchronous acquisition cardiechema signals |
-
2014
- 2014-09-26 CN CN201410501006.7A patent/CN104224225A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105982692A (en) * | 2015-04-29 | 2016-10-05 | 广东医学院附属医院 | Multifunctional stethoscope for broadband parameter monitoring and implementation method of multifunctional stethoscope |
| CN109199432A (en) * | 2018-06-26 | 2019-01-15 | 南京邮电大学 | A kind of parallelly compressed cognitive method of Multi-path synchronous acquisition cardiechema signals |
| CN109199432B (en) * | 2018-06-26 | 2021-09-03 | 南京邮电大学 | Parallel compression sensing method for multi-path synchronous acquisition of heart sound signals |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141224 |
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| WD01 | Invention patent application deemed withdrawn after publication |