CN107374611A - A kind of bio signal processing unit - Google Patents
A kind of bio signal processing unit Download PDFInfo
- Publication number
- CN107374611A CN107374611A CN201710804208.2A CN201710804208A CN107374611A CN 107374611 A CN107374611 A CN 107374611A CN 201710804208 A CN201710804208 A CN 201710804208A CN 107374611 A CN107374611 A CN 107374611A
- Authority
- CN
- China
- Prior art keywords
- module
- signal
- selection purposes
- frequency selection
- processing unit
- 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.)
- Pending
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
Abstract
The invention discloses a kind of bio signal processing unit, described device includes what is be sequentially connected：Pre-amplifying module, power frequency suppression module, frequency selection purposes module, AD conversion module, control module, RF modules；The input electrode of pre-amplifying module is 2, and pre-amplifying module is used to gather bioelectrical signals, and the signal of collection is amplified, reduces noise, shielding interference signal is handled；Power frequency suppression module is used to control Hz noise；Frequency selection purposes module is used to carry out frequency selection purposes；AD conversion module is used to digitize the bioelectrical signals collected；Control module is used to control frequency selection purposes module, AD conversion module, while realizes the communication with RF modules；RF modules are used to the data signal of AD conversion module output being wirelessly sent to host computer；Realize high common mode inhibition, high power frequency rejection ability, high to-noise ratio, so as to effectively gather the technique effect of faint bioelectrical signals.
Description
Technical field
The present invention relates to bio signal process field, in particular it relates to a kind of bio signal processing unit.
Background technology
Kinetocyte or tissue (such as human body, animal tissue) no matter in inactive state or active state, can all produce with
Life state is closely related, regular electrical phenomena, referred to as biological electricity.Bioelectrical signals include resting potential and action electricity
Position, its essence are the cross-film flowings of ion.
Research bioelectrical signals have important value, and bioelectrical signals are influenceed by human body factors, there is one
As the unexistent feature of signal.
1：Signal is weak, span is big, and most faint signal is less than 1 μ V, and maximum can reach mv ranks.
2：Impedance is high, and epidermis signal impedance can be up to hundreds of K ohms.
3：Noise is strong, is highly prone to disturb.
4：Frequency is low, is influenceed greatly by Hz noise.
5：Signal randomness is strong, and biomedicine signals are not still random, and is non-stable, is brought to signal acquisition
Very big difficulty.
Traditional biological electrical signal collection device, common mode inhibition capacity is low, poor anti jamming capability；Can only by complexity structure come
Shielding interference.
The content of the invention
The invention provides a kind of bio signal processing unit, solves traditional biological electrical signal collection device, common mode inhibition
Ability is low, poor anti jamming capability；The technical problem of interference can only be shielded by the structure of complexity, realize high common mode inhibition,
High power frequency rejection ability, high to-noise ratio, so as to effectively gather the technique effect of faint bioelectrical signals.
For achieving the above object, this application provides a kind of bio signal processing unit, described device to be included successively
Connection：Pre-amplifying module, power frequency suppression module, frequency selection purposes module, AD conversion module, control module, RF modules；It is preposition
The input electrode of amplification module is 2, and pre-amplifying module is used to gather bioelectrical signals, and the signal of collection is put
Greatly, noise, shielding interference signal processing are reduced；Power frequency suppression module is used to control Hz noise；Frequency selection purposes module be used for into
Line frequency is chosen；AD conversion module is used to digitize the bioelectrical signals collected；Control module is used to control frequency selection purposes
Module, AD modular converters, while realize the communication with RF modules；RF modules are used for the data signal for exporting AD conversion module
Wirelessly it is sent to host computer.
Wherein, principle of the invention is：Bioelectrical signals access acquiring biological electric signals device by differential mode and entered, and pass through
Phase equilibrium module effectively balances the phase (mainly Hz noise) of common mode interference signal, and pre-amplifying module is real together
Existing high common-mode rejection ratio；Effectively to reduce suppression of the phase equilibrium module to useful signal, access discrete device is to reduce pair
The common mode degree of useful signal；Often the amplitude of power frequency interference signals is all bigger, and the design devises after pre-amplifying module
Power frequency suppression module, it is the supplement suppressed to front end power frequency；In order to adapt to the situation that user gathers different biological telecommunications, devise
Frequency selection purposes module, different frequencies is adjusted by control module, in order to verify the accuracy of frequency selection purposes module, devised
Frequency calibration circuit；The signal collected is digitized by A/D module and realizes and be wirelessly transmitted to by control module, RF modules again
Host computer.
Further, the pre-amplifying module is provided with biological telecommunications match circuit and is used to match bio signal input side
Formula, biological telecommunications match circuit are used for phase equilibrium, improve input impedance, improve signal to noise ratio.
Further, biological telecommunications match circuit includes：Phase equilibrium module, discrete device；Phase equilibrium module is used for
The phase of common-mode signal is balanced, prevents common-mode signal to be changed into difference mode signal, it is therefore an objective to effectively suppresses interference signal and power frequency component；
Discrete device is used to prevent useful signal by phase equilibrium module common mode, so as to realize that useful signal is not suppressed.
Further, the input impedance of pre-amplifying module is 1.5M Ω (in 1KHZ signals)；Signal to noise ratio be 41db (
When input signal is 0.1mV, frequency 1KHZ)；Gain is 34-47dB；Pre-amplifying module front end is pressed down using Differential Input common mode
It is 120dB to make ratio.
Further, it is 5HZ, gain 6-16db that power frequency, which suppresses mould stopband,.
Further, the gain of frequency selection purposes module is 16-23dB, and frequency selection purposes module is additionally operable to supplement amplified signal, carried
Rise device sensitivity, ensuring equipment dynamic property.
One or more technical schemes that the application provides, have at least the following technical effects or advantages：
As a result of effectively balanced by phase equilibrium module common mode interference signal phase (mainly power frequency do
Disturb), and pre-amplifying module realizes high common-mode rejection ratio together；Effectively to reduce suppression of the phase equilibrium module to useful signal
System, discrete device is accessed to reduce the technological means to the common mode degree of useful signal, so, efficiently solve traditional biological telecommunications
Number collector, common mode inhibition capacity is low, poor anti jamming capability；The technical problem of interference can only be shielded by the structure of complexity,
Realize high common mode inhibition, high power frequency rejection ability, high to-noise ratio, so as to effectively gather the skill of faint bioelectrical signals
Art effect.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention；
Fig. 1 is the structural representation of bio signal processing unit in the application.
Embodiment
The invention provides a kind of bio signal processing unit, solves traditional biological electrical signal collection device, common mode inhibition
Ability is low, poor anti jamming capability；The technical problem of interference can only be shielded by the structure of complexity, realize high common mode inhibition,
High power frequency rejection ability, high to-noise ratio, so as to effectively gather the technique effect of faint bioelectrical signals.
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other different from the other modes in the range of being described herein, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Refer to Fig. 1, this application provides acquiring biological electric signals device (including pre-amplifying module, power frequency suppress mould
Block, frequency selection purposes module, A/D module, control module, RF modules), simple in construction, compact, it is only necessary to two input electrodes
(traditional, at least to need four electrodes, the design uses difference signal technique, signal acquisition is done eventually through signal difference)
It just can effectively collect bioelectrical signals.
Acquiring biological electric signals module amplification module includes, pre-amplifying module, power frequency suppression module, frequency selection purposes module
Three parts.
Preposition module：
Preposition module, it is desirable to bioelectrical signals can be effectively gathered, meanwhile, reduce noise, shielding interference signal.It is preposition
The speciality that amplification module has is as follows：
1:High-amplification-factor (selected device, supports high-amplification-factor), effectively improves the noise coefficient of system.
2:Individually designed biological telecommunications match circuit (input pattern signal, it is different with traditional input mode, so being single
Solely design, match circuit, comprising phase equilibrium module, discrete device, purpose is in order to realize, phase equilibrium, high input impedance,
High s/n ratio), to adapt to the characteristics of bioelectrical signals impedance is high, signal is weak；Match circuit can prevent altogether to greatest extent simultaneously
Mould disturbs and Hz noise, effectively transformation of the anti-stop signal from common mode to differential mode.
3:Common-mode rejection ratio, reaching as high as 120dB, (front end uses Differential Input, ensures that front end inputs by inputting to match
Phase equilibrium).
4:Decision systems sensitivity (high-amplification-factor, low noise, so as to system in the case of identical signal, noise
Bigger than becoming, sensitivity just becomes big).
5:Gain is 34----47dB
Power frequency suppression module：
Hz noise is ubiquitous, effectively controls Hz noise, is the problem of acquiring biological electric signals must face；Trap
Module can effectively control power frequency interference signals, and decay reachable -60dB；Module can also provide certain enlarging function simultaneously.
Power frequency suppression module design stopband is 5HZ, and gain is that (after tested, 5HZ stopband, can be with maximum limit by 6---16db
The suppression power frequency component of degree, gain 6---16db, has and utilizes system noise factor).
Frequency selection purposes module：
Frequency selection purposes module, major function are frequency selection purposes, and this filter and amplification module, flexible design can be according to collection
Different bioelectrical signals, make corresponding adjustment；The multiplication factor of this module determines the dynamic parameter of a system.
Speciality is as follows：
1：Signal frequency is chosen and (carries out signal selection according to the service condition of, customer service)；
2：Effectively amplification supplement；
3：(effectively inhibiting interference signal by front end match circuit, (mainly power frequency is done for lifting system sensitivity
Disturb), system signal noise ratio is very high, so comparatively system multiplication factor can is made big, is limited by prior art means,
A/D module sensitivity is not general high, and the sensitivity of system can be improved by the amplification of frequency selection purposes module)；
4：Ensure that dynamic performance (because larger power frequency component is effectively suppressed, ensures the undersaturated feelings of system
Under condition, frequency selection purposes module multiplication factor can do it is bigger, so as to collection bioelectrical signals amplitude range just very
Greatly, therefore Dynamic Range is just greatly improved)；
5:Gain is 16---23dB.
Refer to table 1, table 1 be actually measured disparate modules under different technical indicators, the index pair of whole system
Table is answered, the relevance of different technologies index described above can should be demonstrate,proved from the data in table.
Table 1
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (6)
1. a kind of bio signal processing unit, it is characterised in that described device includes what is be sequentially connected：Pre-amplifying module, work
Frequency suppression module, frequency selection purposes module, AD conversion module, control module, RF modules；The input electrode of pre-amplifying module is 2
Individual, pre-amplifying module is used to gather bioelectrical signals, and the signal of collection is amplified, reduces noise, shielding interference is believed
Number processing；Power frequency suppression module is used to control Hz noise；Frequency selection purposes module is used to carry out frequency selection purposes；AD conversion module is used
Digitized in by the bioelectrical signals collected；Control module is used to control frequency selection purposes module, AD conversion module, realizes simultaneously
With the communication of RF modules；RF modules are upper for the data signal of AD conversion module output to be wirelessly sent to
Machine.
2. bio signal processing unit according to claim 1, it is characterised in that the pre-amplifying module is provided with biology
Telecommunications match circuit is used to match bio signal input mode, and biological telecommunications match circuit is used for phase equilibrium, improves input resistance
It is anti-, improve signal to noise ratio.
3. bio signal processing unit according to claim 2, it is characterised in that biological telecommunications match circuit includes：Phase
Position balance module, discrete device；Phase equilibrium module is used for the phase for balancing common-mode signal；Discrete device is used to prevent useful letter
Number by phase equilibrium module common mode.
4. bio signal processing unit according to claim 2, it is characterised in that the input impedance of pre-amplifying module is
1.5MΩ；Signal to noise ratio is 41db；Gain is 34-47dB；Pre-amplifying module front end use Differential Input common-mode rejection ratio for
120dB。
5. bio signal processing unit according to claim 1, it is characterised in that it is 5HZ that power frequency, which suppresses mould stopband, gain
For 6-16db.
6. bio signal processing unit according to claim 1, it is characterised in that the gain of frequency selection purposes module is 16-
23dB, frequency selection purposes module are additionally operable to supplement amplified signal, lifting device sensitivity, ensuring equipment dynamic property.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804208.2A CN107374611A (en) | 2017-09-08 | 2017-09-08 | A kind of bio signal processing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804208.2A CN107374611A (en) | 2017-09-08 | 2017-09-08 | A kind of bio signal processing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107374611A true CN107374611A (en) | 2017-11-24 |
Family
ID=60352140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710804208.2A Pending CN107374611A (en) | 2017-09-08 | 2017-09-08 | A kind of bio signal processing unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107374611A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445926A (en) * | 2002-03-15 | 2003-10-01 | 松下电器产业株式会社 | Balance high frequency device, method for improving balance characteristic and balance high frequency circuit using the device |
| CN1951318A (en) * | 2005-10-19 | 2007-04-25 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for inhibiting power frequency common-mode interference |
| CN104771158A (en) * | 2015-04-07 | 2015-07-15 | 四川新源生物电子科技有限公司 | Action potential recorder and closed-loop pain suppression system |
-
2017
- 2017-09-08 CN CN201710804208.2A patent/CN107374611A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1445926A (en) * | 2002-03-15 | 2003-10-01 | 松下电器产业株式会社 | Balance high frequency device, method for improving balance characteristic and balance high frequency circuit using the device |
| CN1951318A (en) * | 2005-10-19 | 2007-04-25 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for inhibiting power frequency common-mode interference |
| CN100423688C (en) * | 2005-10-19 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for inhibiting power frequency common-mode interference |
| CN104771158A (en) * | 2015-04-07 | 2015-07-15 | 四川新源生物电子科技有限公司 | Action potential recorder and closed-loop pain suppression system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Oh et al. | Multi-frequency EIT system with radially symmetric architecture: KHU Mark1 | |
| US20190029548A1 (en) | Impedance bootstrap circuit for an interface of a monitoring device | |
| CN101828919A (en) | Surface electromyographic electrode with amplifying function | |
| CN101194836B (en) | Method and device for eliminating interference in bio-electrical impedance measurement | |
| Wang et al. | Design of ECG signal acquisition system based on DSP | |
| Xue et al. | Design of amplifier for wearable human ECG sensor with low power and low noise | |
| CN103190903A (en) | EEG signal amplifier and method for amplifying EEG signal | |
| CN107374611A (en) | A kind of bio signal processing unit | |
| CN103705230B (en) | Pre-stage circuit in bioelectricity detection | |
| Wang | Design of a 32-channel EEG system for brain control interface applications | |
| CN207664957U (en) | A kind of multistage highly-precise filtering circuit based on programmable filter LTC1063 and active filter | |
| CN103142224A (en) | Electroencephalogram signal detector and method for detecting electroencephalogram signal | |
| CN113876336B (en) | Dynamic switching device and dynamic switching method for myoelectricity acquisition reference electrode | |
| Zhu | Design of surface electromyography detection circuit | |
| CN104706344A (en) | Electrocardiosignal measurement collecting system | |
| CN112737517A (en) | Alternating current small signal differential amplification filter circuit suitable for measuring internal resistance of battery | |
| CN207870892U (en) | One kind being used for neonatal EEG signals detection device | |
| CN218445799U (en) | Multi-channel transient voltage-to-ground peak detection circuit based on ZYNQ platform | |
| CN107612513A (en) | A kind of low level signal amplification device | |
| CN105187018B (en) | The improved structure of differential integrator harvester | |
| Zhang et al. | Design of analog front-end circuit for audio-frequency magnetotelluric instrument | |
| Prince et al. | Design of front end circuitry for detection of surface EMG using bipolar recording technique | |
| CN109407157A (en) | A kind of induction type magnetic sensor and electromagnetic survey equipment | |
| CN217879497U (en) | High signal-to-noise ratio processing circuit for partial discharge signal processing | |
| CN210720587U (en) | Power line noise acquisition circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171124 |