CN103735263B - Array surface myoelectric image harvester and acquisition method - Google Patents
Array surface myoelectric image harvester and acquisition method Download PDFInfo
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- CN103735263B CN103735263B CN201310579380.4A CN201310579380A CN103735263B CN 103735263 B CN103735263 B CN 103735263B CN 201310579380 A CN201310579380 A CN 201310579380A CN 103735263 B CN103735263 B CN 103735263B
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Abstract
The invention discloses a kind of surface myoelectric image harvester based on array-type electrode and acquisition method, it comprises 1 16 channel array electrode, 1 reference electrode module, 2 analog filtering amplification circuit module, 2 A/D modular converters, 1 data processing module and 1 power module; During use, 16 channel array electrodes gather 16 input signals, after 16 analog filtering amplifying circuit differential amplifications and filtering, be converted to digital signal by two A/D modular converters, two A/D converters are seized spi bus and are transferred data to main controller MCU process.The present invention can the electromyographic signal of simultaneously high speed acquisition, process and transmission 16 passages, and the parallel connection of multiple harvester uses easily extensible port number, obtains electromyogram picture.Which avoid the misery that iEMG brings to people, muscle group can be obtained again and to have cooperated the myoelectricity image sequence of certain action.
Description
Technical field
The invention belongs to human body surface myoelectric signal collecting device and manufacture field, particularly relate to a kind of array surface myoelectric image harvester and acquisition method.
Background technology
Electromyographic signal (Electromyography, EMG) be applied electronics instrument record muscle static or shrink time the curve of electrical activity.Article one, on muscle fiber, action potential communication process defines ultimate fibre action potential (Single Fiber Action Potential, SFAP); In a motor unit, all SFAP comprehensive superposition over time and space just defines moving cell action potential (Motor Unit Action Potential, MUAP), the distribution process that motor unit continues produces motor unit action potential sequence (Motor UnitAction Potential train, MUAPt); During musculation, the MUAPt that the multiple motor units participating in musculation are formed defines electromyogram picture in the superposition of detecting electrode place space-time after the filter action of the volume conductor be made up of muscle, subcutaneous tissue and skin etc.
Traditional myoelectricity image-pickup method is that tiny to needle electrode or line electrode etc. electrode is directly injected muscular tissue collection, obtains plug-in type electromyographic signal (indwelling or intramuscular EMG Signal, iEMG).Needle electrode, line electrode can contact with muscle fiber well, and it is lower that MUAP superposes mutually degree, therefore can detect the MUAP sequence of different types of movement unit relatively easily.
Another method is called surface EMG detection.Surface myoelectric (surface Electromyography, sEMG) signal is that the bio electricity change of neuromuscular system when carrying out random and non-randomness and being movable guides through surface electrode, amplifies, show and record the one dimension voltage time sequence signal obtained, its amplitude is about 0-5000 μ V, frequency 0-500Hz, signal aspect has stronger randomness and unstability.
Compared with traditional pin type electromyogram signal, the space exploration of sEMG is comparatively large, and repeatability better.Basic research shows, sEMG signal comes from the alphamotoneuronal bioelectric of spinal cord under the control of brain motor cortex, the Physiological factors such as motor unit active synchronization, muscle fiber recruitment under different musculation level and functional status is depended in the amplitude of signal and frequecy characteristic change, and exploring electrode position, signal cross-talk (Crosstalk), skin temperature, muscle length and muscle contraction mode etc. measure the combined effect of sexual factor.Controlling under good condition, the change of above-mentioned sEMG signal activity to a great extent can the musculation such as local fatigue degree, muscle strength level, muscle activation pattern, motor unit excitatory transmission speed, polymyarian group harmony of quantitative response musculation and the Changing Pattern of maincenter controlling feature, and thus clinical for Sports Scientific Research, gesture identification, rehabilitation medicine in basic research etc. has important learning value and application value.
But above these two kinds of electromyographic signal collection methods all Shortcomings.
Medical practice shows, iEMG brings larger misery to patient, and first, it can cause damage to skin, also can bring pain to patient; Secondly, it is not suitable for repeatedly duplicate detection.
And the passage that the sEMG signal picker that we can see at present is all single channel or several dispersions gathers.Cooperation relation between polymyarian group can not be analyzed because electromyographic signal exists signal that crosstalk phenomenon makes to collect, then due to electrode detection dot density meticulous not, the research that it carries out in higher levels of graphics cannot be utilized.
Summary of the invention
For overcoming the technical deficiency of existing electromyographic signal collection and defect, the invention provides a kind of surface myoelectric image harvester based on array-type electrode and acquisition method.It can gather, process and transmit simultaneously the electromyographic signal of 16 passages at high speed, and uses by the parallel connection of multiple harvester the expansion obtaining port number, thus forms the electromyogram picture be made up of closely spaced electrode.Which avoid the misery that iEMG brings to people, the myoelectricity image sequence of certain action that to have cooperated between different muscle group can be obtained again simultaneously.
For this reason, the present invention adopts following technical scheme to solve above technical problem:
A kind of array surface myoelectric image harvester, comprises the array electrode of 1 16 passage, 1 reference electrode module, 2 analog filtering amplification circuit module, 2 A/D modular converters, 1 data processing module and 1 power module.
The array electrode of described 16 passages is made up of two 8 channel array electrodes, and each 8 channel array electrodes are made up of 8 electrodes, can gather 8 tunnel electromyographic signals.
Described reference electrode module is made up of an electrode, is affixed on the less position of human body surface muscular tissue (as wrist), is the reference ground of array surface myoelectric image harvester of the present invention.
Described analog filtering amplification circuit module comprises eight analog filtering amplifying circuits, and each analog filtering amplifying circuit is composed in series by one-level differential amplifier circuit, bandwidth-limited circuit and secondary differential amplifier circuit.Each analog filtering amplifying circuit is connected with a passage in 8 channel array electrodes of front end.Analog filtering amplification circuit module carries out the interfering signal after one-level differential amplification beyond filtering 20-380Hz to the small-signal that electrode collects, then through secondary differential amplification, output signal ratio input signal strengthens about 60dB.16 road signal parallel transmission, do not interfere with each other.
Described A/D modular converter comprises the high-speed a/d converter that can be carried out 8 channel parallel data collections, is digital signal by the 8 road signal conversion codings amplified through analog filtering.The order that the SPI interface of A/D converter sends for the main controller MCU receiving reply data processing module and the data converted are sent.
Described data processing module comprises a main controller MCU, and it is responsible for sending order to A/D converter and the data converted in A/D converter being read in laggard row date processing by spi bus, and is sent by another road spi bus.
The 3.7-12V DC voltage that outside provides by power module is converted to the running voltage of+3.3V DC voltage supply main controller MCU and A/D converter; ± 2.5V DC voltage supply the running voltage of analogue amplifier and the positive negative reference voltage of A/D converter.
Another object of the present invention is to provide a kind of acquisition method of array electromyogram picture, and the method is realized by one or more array surface myoelectric image harvester, and the method is specially:
1, worn array myoelectricity image acquisition device, the array electrode module by 16 passages of array surface myoelectric image harvester is attached to human body elbow with lower portion, and reference electrode is attached in wrist.
2, initialize: start array myoelectricity image acquisition device, prepare after initializing to start to gather.
3,16 channel array electrodes are divided into two 8 channel array electrodes, eight common-mode signals between adjacent two electrodes of each 8 channel array electrodes collection and between last electrode and ground are as input signal, and 16 channel array electrodes gather 16 input signals altogether.
4,16 input signals that step 3 gathers enter 16 analog filtering amplifying circuits of two analog filtering amplification circuit module respectively.Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then through secondary differential amplification.
5, the signal through step 4 secondary differential amplification enters two A/D modular converters respectively, is converted to digital signal by two A/D modular converters, often converts once just to send to main controller MCU once to complete request.
6, two A/D converters adopt the mode of preemptive type spi bus to transmit data to main controller MCU.When arbitrary A/D converter data convert, be sent completely request to MCU immediately.MCU receives the SPI interface of settling signal and this A/D converter of gating, shields the SPI interface of another A/D converter, and concurrent order of losing one's life receives the transformation result of this A/D converter.If another A/D converter completes data conversion when the current A/D converter carrying out data transmission does not complete data transmission, will wait until that the current A/D converter transmitting data seizes spi bus after completing data transmission immediately, and start transmission.Temporal control there will not be the situation of loss of data to occur.
7, in data processing module, main controller MCU processes the data received, and the data of 16 passages is sent by another SPI mouth.
The invention has the beneficial effects as follows:
1, collection surface electromyographic signal image of the present invention, electrode only need be attached to skin surface, without the need to thrusting skin, overcomes the misery that plug-in type myoelectricity image acquisition is brought to people.
2, the surface myoelectric image of collection of the present invention is 16 channel array formula electromyogram pictures, and can according to demand arbitrary extension to 16 × N channel, and image data amount is large, and the dependency of data is strong, facilitates the process of electromyogram picture in graphics.Such as 8 16 channel array formula myoelectricity image acquisition devices use simultaneously, just can obtain the array electromyogram picture of 128 passages.Overcome the deficiency of conventional surface electromyographic signal collection data.
3, the present invention is when adopting many array myoelectricity image-pickup method to carry out myoelectricity image acquisition, and separate collection between multiple single array myoelectricity image acquisition device, does not interfere with each other, and decreases the interference between the data that collect, enhances the effectiveness of data.
4, present invention employs high-speed a/d converter and carry out the conversion of analogue signal to digital signal, there is precision high, fireballing advantage, use MCU to carry out date processing simultaneously, there is low in energy consumption, that efficiency is high feature.
5, present invention employs spi bus mode and carry out data transmission, simplify circuit design, reduce the volume of harvester, have again higher transfer rate simultaneously, meet the transmission demand of Large Volume Data.
6, the present invention designs according to the design principle of portable, wearable mobile unit, and product has little, low in energy consumption, the wieldy feature of volume.
Accompanying drawing explanation
Fig. 1 is the structural representation of array surface myoelectric image harvester of the present invention;
Fig. 2 is the connection diagram of multiple array surface myoelectric image harvester;
Fig. 3 is the circuit diagram of data processing module;
Fig. 4 is the circuit diagram of A/D modular converter;
Fig. 5 is the circuit diagram of analog filtering amplification circuit module;
Fig. 6 is the structural representation of electrode;
Fig. 7 is the circuit diagram of power module;
Fig. 8 is the structural representation of reference electrode module.
Detailed description of the invention
Below, the invention will be further described with specific embodiment by reference to the accompanying drawings.
As depicted in figs. 1 and 2, array myoelectricity image acquisition device of the present invention, comprises the array-type electrode of 1 16 passage, 2 analog filtering amplifying circuits, 2 A/D modular converters, 1 data processing module and 1 power module.
Data processing module 101: mainly comprise the MCU(U7 for control data transmission and date processing).As shown in Figure 3, MCU the 49th foot (SPI0_PCS0), the 50th foot (SPI0_SCK), the 51st foot (SPI0_MOSI), the 52nd foot (SPI0_MISO) are the SPI0 interfaces of MCU, be connected with the SPI interface of the A/D converter in A/D modular converter 201-1,201-2, work in holotype, for sending order to A/D converter and receiving data.Wherein the 49th foot is connected with 39 feet of A/D converter, and the 50th foot is connected with 40 feet of A/D converter, and the 51st foot is connected with 34 feet of A/D converter, and the 52nd foot is connected with the 43rd foot of A/D converter.
MCU the 8th foot (
), the 19th foot (
), the 23rd foot (
), the 36th foot (START), the 45th foot (CLKSEL) be connected with A/D converter in A/D modular converter 201-1,201-2.Wherein the 8th foot is connected with 35 feet of A/D converter, controls A/D converter whether dormancy.19th foot is connected with the 36th foot of A/D converter, controls the reset of A/D converter.23rd foot is connected with the 47th foot of A/D converter, receives the signal that A/D converter converts, and produces and interrupts.36th foot is connected with the 38th foot of A/D converter, controls the start and stop of A/D converter.45th foot is connected with the 52nd foot of A/D converter, for selecting the clock signal of A/D converter.
MCU the 61st foot (SPI1_PCS0), the 62nd foot (SPI1_SCK), the 63rd foot (SPI1_MOSI), the 64th foot (SPI1_MISO) are the SPI1 interfaces of MCU, for outwards sending data.When adopting many array-type electrodes harvester acquisition method, the SPI1 mouth identical function foot of each MCU being linked together and namely forms spi bus, the data of each MCU can be sent by spi bus.
MCU the 26th foot (PTA4), the 27th foot (PTA5) only need when many array-type electrodes harvester acquisition method to connect.27th foot of first MCU is always unsettled, and the 26th foot of last MCU is always unsettled.In addition, first MCU the 26th foot is connected with the 27th foot of second MCU, by that analogy.26th foot needs the gating signal of the SPI1 mouth of the MCU sending data for sending the next one, the 27th foot is for receiving the gating signal of the SPI1 mouth of upper MCU transmission, the function of enable SPI1.
+ the 3.3V that MCU the 3rd foot (VDD), the 30th foot (VDD), the 48th foot (VDD) connect power module 501 exports, and the 4th foot (VSS), the 31st foot (VSS), the 47th foot (VSS) ground connection, for MCU provides running voltage.+ the 3.3V that 13rd foot (VDDA) connects power module 501 exports, and the 16th foot (VSSA) ground connection, and two electric capacity C50 and C51 in parallel between the 13rd foot with the 16th foot, for the inside A/D converter etc. of MCU provides running voltage.14th foot (VREFH) is in parallel with the 13rd foot (VDDA), and the 15th foot (VREFL) is in parallel with the 16th foot (VSSA), for the inside A/D converter of MCU provides reference voltage.
MCU the 32nd foot (EXTAL), the 33rd foot (XTAL0) are connected with external crystal-controlled oscillation Y1, for MCU provides clock frequency.Ground connection after 32nd foot (EXTAL) series capacitance C36 in outside oscillating circuit, ground connection after the 33rd foot (XTAL0) series capacitance C39, forms frequency of oscillation trimming circuit with parallel resistance R15.
MCU the 34th foot is connected with reset circuit, for the duty of the MCU that resets.Wherein reset circuit is made up of resistance R14, electric capacity C38, button S1.
A/D modular converter 201-1,201-2: mainly comprise the 8 road high-speed a/d converters for analogue signal being converted to digital signal.As shown in Figure 4,1st ~ 16 feet of A/D converter (U1) are the input of analogue signal, wherein the 2nd, 4,6,8,10,12,14,16 feet output signal with 8 tunnels of analog filtering amplification module 301-1,301-2 respectively and are connected; 1st, 3,5,7,9,11,13,15 feet can pass through resistance R4 ground connection, also can be connected as the negative reference edge of analogue signal with the 64th foot WCT of MCU through resistance R1, C1 low-pass filtering.
+ the 2.5V that 19th foot (AVDD_2) of A/D converter, the 21st foot (AVDD_3), the 22nd foot (AVDD_4), the 54th foot (AVDD_1), the 56th foot (AVDD_5), the 59th foot (AVDD) connect power module 501 exports, and 19th, 21,22 foot shunt capacitance C11, C12, C13 ground connection, 54th foot, the 56th foot, the 59th foot shunt capacitance C3, C7 ground connection, for filtering;-the 2.5V that 20th foot (AVSS_2), the 23rd foot (AVSS_3), the 32nd foot (AVSS_4), the 53rd foot (AVSS_1), the 56th foot (AVSS_3), the 57th foot (AVSS_7), the 58th foot (AVSS) connect power module 501 exports, and 20th, 23,32 foot shunt capacitance C14, C16, C22 ground connection, 56th foot, the 57th foot, the 58th foot shunt capacitance C4, C5 ground connection, for filtering.+ the 3.3V that 48th foot (DVDD_2), the 50th foot (DVDD) connect power module 501 exports, and the ground connection that is connected with electric capacity C9, C10, C15, the 33rd foot (DGND_2), the 49th foot (DGND_3), the 51st foot (DGND) ground connection.Above supply pin provides running voltage for A/D converter.
24th foot (VREFP) of A/D converter, the 25th foot (VREFN) are connected to two electric capacity C17, C19 two ends in parallel respectively, and-the 2.5V that the 25th foot connects power module 501 exports, and form the reference voltage input of A/D converter.26th foot (VCAP4) meets-2.5V connecing power module 501 after electric capacity, the 28th foot (VCAP1), the 30th foot (VCAP2), the 55th foot (VCAP3) are connected with C6 and the C8 of electric capacity C18, C20, C21, parallel connection respectively and exports, as shunt capacitance.31st foot (RESV1) ground connection.
A/D converter the 34th foot (DIN), the 39th foot (
), the SPI0 interface of the main controller MCU of the 40th foot (SCLK), the 43rd foot (DOUT) and data processing module 101, wherein the 34th foot is connected to the 51st foot of MCU, 39th foot is connected to 49 feet of MCU, and the 40th foot is connected to 50 feet of MCU, and the 43rd foot is connected to 52 feet of MCU.35th foot (
) be connected to the 7th foot of MCU), the 36th foot (
) being connected to the 8th foot of MCU, the 38th foot (START) is connected to the 36th foot of MCU.47th foot (
) be connected to the 23rd foot of MCU.52nd foot (CLKSEL) is connected to the 45th foot of MCU.
A/D converter the 60th foot (RLDINV_2) ground connection.61st foot (RLDINV), the 62nd foot (RLDIN), the 63rd foot (RLDOUT) form driven-right-leg circuit with resistance R2, R3 and electric capacity C2.
Analog filtering amplification circuit module 301-1,301-2: the signal for being collected by electrode carries out amplifying and filtering.As shown in Figure 5, the signal of 1 passage is obtained by the signal operation of electrode No. 1 point and No. 2 points.The signal of No. 1 point is imported into by J1, and the signal of No. 2 points is imported into by J2, is entered U2 respectively through after R1, C2, R15, C14, C8 low-pass filtering and is carried out differential amplification by U2 the 1st foot (-IN), the 4th foot (+IN).U2 the 2nd foot (Rg), the 3rd foot (Rg) connecting resistance Rg1 are for regulating amplification.5th foot (-Vs), the 8th foot (+Vs) connect-the 2.5V ,+2.5V running voltage of power module 501 respectively, and electric capacity Ca1, Ca3 are used for decoupling.6th foot (REF) ground connection.7th foot (Vout) exports the signal after amplifying.Signal through U2 is exaggerated 40dB.
It is the high pass filter of 20Hz that electric capacity C111, C101 and resistance R4 form cut-off frequency.
Resistance R6, R3, R9 and electric capacity C3, C7 form first order second order chebyshev low-pass filter, resistance R2, R7, R11 and electric capacity C1, C11 form second level second order chebyshev low-pass filter.Two-stage low pass filter forms a quadravalence Chebyshev low-pass filter amplifier, and cut-off frequency is 380Hz, and signal amplifies 18dB.
U3 is the rail-to-rail output double operational of high accuracy, and the 1st foot (VoutA), the 2nd foot (-INA), the 3rd foot (+INA) are first amplifier.5th foot (+INB), the 6th foot (-INB), the 7th foot (VoutB) are second amplifier.7th foot (V-), the 8th foot (V+) meet-the 2.5V ,+2.5V of power module 501 respectively, provide the running voltage of U3.Electric capacity C5, C13 are used for decoupling.7th foot (VoutB) exports final signal.
It is the band filter of 20 ~ 380Hz that high pass filter and quadravalence chebyshev low-pass filter are equivalent to a passband, and finally amplifies 58dB altogether through two-stage amplification.
2nd passage is identical with first passage to the 8th passage.
Electrode 401: can be attached to skin surface, for gathering array electromyogram picture.As shown in Figure 6, each array electromyographic electrode there are 16 circular electrodes, are divided into two 8 channel electrodes in left and right, respectively have 8 electrodes.
On the fexible film that electrodes is made in polyimide material.The long 180mm of thin film, wide 20mm, thick 0.15mm.Electrode pad diameter 3.5mm, distance 10mm between the two electrode centers of circle, distance 10mm between the two rows electrode center of circle.Electrode adopts turmeric technique, thickness 0.1mm.Be through hole between two row's electrodes, diameter 2mm, center of circle spacing 10mm.Circuit line width 0.25mm.
Power module 501: for whole harvester provides voltage, can be depressurized to+3.3V ,+2.5V ,-2.5V three kinds of voltages by 3.7-12V external input voltage.As shown in Figure 7, BT1 is that 6V battery is as power supply.
Voltage conversion chip U3 is used for external input voltage to be converted to+3.3V.1st foot (Vin) connects external input voltage, and C26 is decoupling capacitor.2nd foot (GND) ground connection.3rd foot (EN) connects external input voltage, enable chip.4th foot (BYP) connects C31 shunt capacitance to reduce output ripple.5th foot (Vout) is+3.3V output voltage, and electric capacity C27 is filter capacitor.
Voltage conversion chip U4 is used for external voltage to be converted to+2.5V.1st foot (Vin) connects external input voltage, and C28 is decoupling capacitor.2nd foot (GND) ground connection.3rd foot (EN) connects external input voltage, enable chip.4th foot (BYP) connects C33 shunt capacitance to reduce output ripple.5th foot (Vout) is+2.5V output voltage, and electric capacity C29 is filter capacitor.
Voltage conversion chip U2 is used for external voltage to be converted to-2.5V.1st foot (COMP) meets capacitance compensation electric capacity C23.2nd foot (GND) ground connection.3rd foot (Vin), the 4th foot (EN) connect external input voltage after meeting electric capacity R10, and electric capacity C30 is used for decoupling.5th foot (IN) connects external input voltage, and electric capacity C34 is used for decoupling.6th foot (SW) exports for switching inverter, forms feedback circuit with inductance L 1, small-signal Schottky diode D1, resistance R9, R11, electric capacity C25, the 9th foot (FB).7th foot (PS_GND) ground connection.8th foot (OUT) exports-2.5V voltage.10th foot (VREF) and resistance R7, electric capacity C24 form feedback reference voltage circuit.
Reference electrode module 601: as shown in Figure 8, only has an electrode to form, is connected with the ground of array surface myoelectric image harvester.Be affixed on the position that people's specific surface muscular tissue is less during use, the reference ground of circuit is provided.No matter be single array myoelectricity harvester acquisition method or many array myoelectricity harvester acquisition method, all only need a reference electrode module.
The acquisition method of array electromyogram picture of the present invention, the method is realized by one or more array surface myoelectric image harvester, and the method is specially:
1, worn array myoelectricity image acquisition device, the array electrode module by 16 passages of array surface myoelectric image harvester is attached to human body elbow with lower portion, and reference electrode is attached in wrist.
2, initialize: start array myoelectricity image acquisition device, prepare after initializing to start to gather.
3,16 channel array electrodes are divided into two 8 channel array electrodes, eight common-mode signals between adjacent two electrodes of each 8 channel array electrodes collection and between last electrode and ground are as input signal, and 16 channel array electrodes gather 16 input signals altogether.
4,16 input signals that step 3 gathers enter 16 analog filtering amplifying circuits of two analog filtering amplification circuit module respectively.Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then through secondary differential amplification.
5, the signal through step 4 secondary differential amplification enters two A/D modular converters respectively, is converted to digital signal by two A/D modular converters, often converts once just to send to main controller MCU once to complete request.
6, two A/D converters adopt the mode of preemptive type spi bus to transmit data to main controller MCU.When arbitrary A/D converter data convert, be sent completely request to MCU immediately.MCU receives the SPI interface of settling signal and this A/D converter of gating, shields the SPI interface of another A/D converter, and concurrent order of losing one's life receives the transformation result of this A/D converter.If another A/D converter completes data conversion when the current A/D converter carrying out data transmission does not complete data transmission, will wait until that the current A/D converter transmitting data seizes spi bus after completing data transmission immediately, and start transmission.Temporal control there will not be the situation of loss of data to occur.
7, in data processing module, main controller MCU processes the data received, and the data of 16 passages is sent by another SPI mouth.
Claims (2)
1. an array surface myoelectric image harvester, is characterized in that, it comprises the array electrode of 1 16 passage, 1 reference electrode module, 2 analog filtering amplification circuit module, 2 A/D modular converters, 1 data processing module and 1 power module; Wherein,
The array electrode of described 16 passages is made up of two 8 channel array electrodes, and each 8 channel array electrodes are made up of 8 electrodes, gather 8 tunnel electromyographic signals;
Described reference electrode module is made up of an electrode, is reference ground;
Described analog filtering amplification circuit module comprises eight analog filtering amplifying circuits, and each analog filtering amplifying circuit is composed in series by one-level differential amplifier circuit, bandwidth-limited circuit and secondary differential amplifier circuit; Each analog filtering amplifying circuit is connected with a passage in 8 channel array electrodes of front end; Analog filtering amplification circuit module carries out the interfering signal after one-level differential amplification beyond filtering 20-380Hz to the small-signal that electrode collects, then through secondary differential amplification; 16 road signal parallel transmission, do not interfere with each other;
Described A/D modular converter comprises the high-speed a/d converter that is carried out 8 channel parallel data collections, is digital signal by the 8 road signal conversion codings amplified through analog filtering; The order that the SPI interface of A/D converter sends for the main controller MCU receiving reply data processing module and the data converted are sent;
Described data processing module comprises a main controller MCU, and it is responsible for sending order to A/D converter and the data converted in A/D converter being read in laggard row date processing by spi bus, and is sent by another road spi bus;
The 3.7-12V DC voltage that outside provides by power module is converted to the running voltage of+3.3V DC voltage supply main controller MCU and A/D converter, ± 2.5V DC voltage supply the running voltage of analog amplify circuit and the positive negative reference voltage of A/D converter.
2. application rights requires an acquisition method for the array electromyogram picture of array surface myoelectric image harvester described in 1, and the method is realized by one or more array surface myoelectric image harvester, and it is characterized in that, the method is specially:
(1) worn array myoelectricity image acquisition device, the array electrode module by 16 passages of array surface myoelectric image harvester is attached to human body elbow with lower portion, and reference electrode is attached in wrist;
(2) initialize: start array myoelectricity image acquisition device, prepare after initializing to start to gather;
(3) 16 channel array electrodes are divided into two 8 channel array electrodes, eight common-mode signals between adjacent two electrodes of each 8 channel array electrodes collection and between last electrode and ground are as input signal, and 16 channel array electrodes gather 16 input signals altogether;
(4) 16 input signals that step (3) gathers enter 16 analog filtering amplifying circuits of two analog filtering amplification circuit module respectively; Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then through secondary differential amplification;
(5) signal through step (4) secondary differential amplification enters two A/D modular converters respectively, is converted to digital signal by two A/D modular converters, often converts once just to send to main controller MCU once to complete request;
(6) two A/D converters adopt the mode of preemptive type spi bus to transmit data to main controller MCU; When arbitrary A/D converter data convert, be sent completely request to MCU immediately; MCU receives the SPI interface of settling signal and this A/D converter of gating, shields the SPI interface of another A/D converter, and concurrent order of losing one's life receives the transformation result of this A/D converter; If another A/D converter completes data conversion when the current A/D converter carrying out data transmission does not complete data transmission, will wait until that the current A/D converter transmitting data seizes spi bus after completing data transmission immediately, and start transmission; Temporal control there will not be the situation of loss of data to occur;
(7) in data processing module, main controller MCU processes the data received, and the data of 16 passages is sent by another SPI mouth.
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| CN105326501A (en) * | 2015-12-10 | 2016-02-17 | 宁波工程学院 | Muscle disease monitoring method based on sEMG |
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