CN103735263A - Array surface myoelectric image collector and collecting method - Google Patents
Array surface myoelectric image collector and collecting method Download PDFInfo
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- CN103735263A CN103735263A CN201310579380.4A CN201310579380A CN103735263A CN 103735263 A CN103735263 A CN 103735263A CN 201310579380 A CN201310579380 A CN 201310579380A CN 103735263 A CN103735263 A CN 103735263A
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Abstract
The invention discloses an array surface myoelectric image collector based on an array electrode and a collecting method. The array surface myoelectric image collector comprises the one 16-channel array electrode, one reference electrode module, two simulation filter and amplification modules, two A/D conversion module, one data processing module and one power module. When the array surface myoelectric image collector is used, sixteen input signals are collected by the 16-channel array electrode, differential amplification and filtering are carried out by sixteen simulation filter and amplification circuits, the input signals are converted into digital signals through the two A/D conversion models, and two A/D converters race to control an SPI bus to transmit data to an MCU for processing. According to the array surface myoelectric image collector, myoelectric signals of sixteen channels can be collected, processed and transmitted at a high speed at the same time, the number of the channels can be increased when a plurality of collectors are used in a parallel connection mode, and a myoelectric image is obtained. Pains, caused by an iEMG, of people are avoided, and the myoelectric image sequence that muscle groups complete a certain motion in a cooperated mode can be further obtained.
Description
Technical field
The invention belongs to human body surface myoelectric signal collecting device and manufacture field, relate in particular to a kind of array surface myoelectric image harvester and acquisition method.
Background technology
Electromyographic signal (Electromyography, EMG) is the curve of the static or electrical activity while shrinking of applied electronics instrument record muscle.Article one, on muscle fiber, action potential communication process has formed ultimate fibre action potential (Single Fiber Action Potential, SFAP); In a motor unit, the comprehensive stack of all SFAP on time and space just formed moving cell action potential (Motor Unit Action Potential, MUAP), the lasting distribution process of motor unit produces motor unit action potential sequence (Motor Unit Action Potential train, MUAPt); During musculation, participate in MUAPt that a plurality of motor units of musculation form and at detecting electrode place space-time, superpose and formed electromyogram picture after the filter action of the volume conductor that formed by muscle, subcutaneous tissue and skin etc.
Traditional myoelectricity image-pickup method is that the tiny electrodes such as needle electrode or line electrode are directly injected to 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 the MUAP degree that superposes is mutually lower, therefore can detect relatively easily the MUAP sequence of different types of movement unit.
Another method is called surface EMG detection.Surface myoelectric (surface Electromyography, sEMG) signal is that the bio electricity variation of neuromuscular system when carrying out random and non-random activity guides, amplifies, shows and record through surface electrode the one dimension voltage time sequence signal obtaining, its amplitude is about 0-5000 μ V, frequency 0-500Hz, signal aspect has stronger randomness and unstability.
Compare with traditional pin type electromyogram signal, the space exploration of sEMG is larger, and repeatability better.Basic research shows, sEMG signal comes from the alphamotoneuronal bioelectric of spinal cord under the control of brain motor cortex, the amplitude of signal and frequecy characteristic change the Physiological factors such as the movable synchronization of the motor unit depending under different musculation levels and functional status, muscle fiber recruitment, and exploring electrode position, signal cross-talk (Crosstalk), skin temperature, muscle length and muscle contraction mode etc. are measured the combined effect of sexual factor.Controlling under good condition, the variation of above-mentioned sEMG signal activity to a great extent can quantitative response musculation the musculatioies such as the excited conduction velocity of local fatigue degree, muscle strength level, muscle enable mode, motor unit, polymyarian group harmony and the Changing Pattern of maincenter controlling feature, thereby for Sports Scientific Research, gesture identification, rehabilitation medicine is clinical and basic research etc. has important learning value and application value.
But above these two kinds of electromyographic signal collection methods are Shortcomings all.
Medical practice shows, iEMG has brought larger misery to patient, and first, its 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 is at present all single channel or several dispersions gathers.Because electromyographic signal exists crosstalk phenomenon, make the signal collecting can not analyze the cooperation relation between polymyarian group, then because electrode detection dot density is meticulous not, cannot utilize it to carry out the research in higher levels of graphics.
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 and acquisition method based on array-type electrode.It can gather, process and transmit the electromyographic signal of 16 passages at high speed, and can use the expansion that obtains port number by the parallel connection of a plurality of harvesters, thereby forms the electromyogram picture being comprised of closely spaced electrode.The misery that this has been avoided iEMG to bring to people can obtain again the myoelectricity image sequence of certain action that cooperated between different muscle groups simultaneously.
For this reason, the present invention adopts following technical scheme to solve above technical problem:
An array surface myoelectric image harvester, comprises the array electrode of 1 16 passage, 1 reference electrode module, 2 analog filtering amplifying circuit modules, 2 A/D modular converters, 1 data processing module and 1 power module.
The array electrode of described 16 passages is comprised of two 8 channel array electrodes, and each 8 channel array electrode is comprised of 8 electrodes, can gather 8 tunnel electromyographic signals.
Described reference electrode module consists 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 amplifying 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.A passage in 8 channel array electrodes of each analog filtering amplifying circuit and front end is connected.The small-signal that analog filtering amplifying circuit module collects electrode is carried out the interfering signal beyond filtering 20-380Hz after one-level differential amplification, then passes through secondary differential amplification, and output signal ratio input signal strengthens 60dB left and right.16 road signal parallel transmission, do not interfere with each other.
Described A/D modular converter comprises a high-speed a/d converter that can carry out 8 channel parallel data collections, by the 8 road signal conversion codings that amplify through analog filtering, is digital signal.The order that the SPI interface of A/D converter sends for the main controller MCU that receives reply data processing module and the data that convert are sent.
Described data processing module comprises a main controller MCU, and it is responsible for sending order and the data that convert in A/D converter being read in to laggard row date processing by spi bus to A/D converter, and sends by another road spi bus.
Be converted to+3.3V of the 3.7-12V DC voltage DC voltage that power module provides outside is supplied with the running voltage of main controller MCU and A/D converter; ± 2.5V DC voltage is supplied with 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 realizes by one or more array surface myoelectric image harvesters, and the method is specially:
1, worn array myoelectricity image acquisition device, the array electrode module that is about to 16 passages of array surface myoelectric image harvester is attached to the following position of human body elbow, and reference electrode is attached in wrist.
2, initialize: start array myoelectricity image acquisition device, after initializing, prepare to start to gather.
3,16 channel array electrodes are divided into two 8 channel array electrodes, each 8 channel array electrode gathers eight common-mode signals between adjacent two electrodes and between last electrode and ground as input signal, and 16 channel array electrodes gather 16 input signals altogether.
4,16 input signals that step 3 gathers enter respectively 16 analog filtering amplifying circuits of two analog filtering amplifying circuit modules.Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then pass through secondary differential amplification.
5, the signal through step 4 secondary differential amplification enters respectively two A/D modular converters, by two A/D modular converters, is converted to digital signal, often converts once and just to main controller MCU, sends the request that once completes.
6, two A/D converters adopt the mode of preemptive type spi bus to main controller MCU transmission data.When arbitrary A/D converter data transaction completes, to MCU, be sent completely request immediately.MCU receives that settling signal is the SPI interface of this A/D converter of gating, shields the SPI interface of another A/D converter, and the concurrent order of losing one's life receives the transformation result of this A/D converter.If another A/D converter completes data transaction when the current A/D converter that carries out transfer of data does not complete transfer of data, by waiting for after the current A/D converter that is transmitting data completes transfer of data, seize immediately spi bus, and start transmission.Temporal control will there will not be the situation of loss of data to occur.
7, in data processing module, main controller MCU processes the data that receive, and can the data of 16 passages be 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 thrusting skin, has overcome 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 be according to demand arbitrary extension to 16 * N passage, and image data amount is large, and the dependency of data is strong, facilitates the processing of electromyogram picture in graphics.Such as 8 16 channel array formula myoelectricity image acquisition devices are used 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 a plurality of single array myoelectricity image acquisition devices, does not interfere with each other, and has reduced the interference between the data that collect, and has strengthened the effectiveness of data.
4, the present invention has adopted high-speed a/d converter to carry out analogue signal to the conversion of digital signal, has precision high, and fireballing advantage is used MCU to carry out date processing simultaneously, has feature low in energy consumption, efficiency is high.
5, the present invention has adopted spi bus mode to carry out transfer of data, has simplified circuit design, has dwindled the volume of harvester, has again higher transfer rate simultaneously, meets the transmission demand of Large Volume Data.
6, the present invention designs according to design principle portable, wearable mobile unit, and product has little, low in energy consumption, the wieldy feature of volume.
Fig. 1 is the structural representation of array surface myoelectric image harvester of the present invention;
Fig. 2 is the connection diagram of a plurality of array surface myoelectric image harvesters;
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 amplifying 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.
the specific embodiment
Below, the invention will be further described with specific embodiment by reference to the accompanying drawings.
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 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 whether dormancy of A/D converter.The 19th foot is connected with the 36th foot of A/D converter, controls the reset of A/D converter.The 23rd foot is connected with the 47th foot of A/D converter, receives the signal that A/D converter converts, and produces and interrupts.The 36th foot is connected with the 38th foot of A/D converter, controls the start and stop of A/D converter.The 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 is linked together and 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 to connect when many array-type electrodes harvester acquisition method.The 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.The 26th foot need to send the gating signal of SPI1 mouth of the MCU of data for sending the next one, and the 27th foot, for the gating signal of the SPI1 mouth that receives a MCU and send, enables the function of SPI1.
MCU the 3rd foot (VDD), the 30th foot (VDD), the 48th foot (VDD) connect power module 501+3.3V output, and the 4th foot (VSS), the 31st foot (VSS), the 47th foot (VSS) ground connection, for MCU provides running voltage.The 13rd foot (VDDA) connects the output of power module 501+3.3V, and the 16th foot (VSSA) ground connection, and two capacitor C 50 in parallel and C51 between the 13rd foot and the 16th foot, for the inside A/D converter of MCU etc. provides running voltage.The 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 the 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 comprised of resistance R 14, capacitor C 38, button S1.
A/D modular converter 201-1,201-2: mainly comprise for analogue signal being converted to 8 road high-speed a/d converters of digital signal.As shown in Figure 4, the input that 1st～16 feet of A/D converter (U1) are analogue signal, wherein the 2nd, 4,6,8,10,12,14,16 feet are connected with the 8 tunnel output signals of analog filtering amplification module 301-1,301-2 respectively; 1st, 3,5,7,9,11,13,15 feet can pass through resistance R 4 ground connection, also can be connected as the negative reference edge of analogue signal with the 64th foot WCT of MCU through resistance R 1, C1 low-pass filtering.
The 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+2.5V output, and 19th, 21,22 foot shunt capacitance C11, C12, C13 ground connection, the 54th foot, the 56th foot, the 59th foot shunt capacitance C3, C7 ground connection, for filtering; The 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 501-2.5V output, and 20th, 23,32 foot shunt capacitance C14, C16, C22 ground connection, the 56th foot, the 57th foot, the 58th foot shunt capacitance C4, C5 ground connection, for filtering.The 48th foot (DVDD_2), the 50th foot (DVDD) connect power module 501+3.3V output, and the ground connection that is connected with capacitor C 9, 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.
The 24th foot (VREFP) of A/D converter, the 25th foot (VREFN) are connected to respectively in parallel two capacitor C 17, C19 two ends, and the 25th foot connect power module 501-2.5V output, form the reference voltage input of A/D converter.The 26th foot (VCAP4) connect after electric capacity, the 28th foot (VCAP1), the 30th foot (VCAP2), the 55th foot (VCAP3) are connected with C8 with capacitor C 18, C20, C21, C6 in parallel respectively, connect power module 501-2.5V exports, as shunt capacitance.The 31st foot (RESV1) ground connection.
A/D converter the 34th foot (DIN), the 39th foot (
), the SPI0 interface of the 40th foot (SCLK), the 43rd foot (DOUT) and the main controller MCU of data processing module 101, wherein the 34th foot is connected to the 51st foot of MCU, the 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.The 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.The 47th foot (
) be connected to the 23rd foot of MCU.The 52nd foot (CLKSEL) is connected to the 45th foot of MCU.
A/D converter the 60th foot (RLDINV_2) ground connection.The 61st foot (RLDINV), the 62nd foot (RLDIN), the 63rd foot (RLDOUT) form driven-right-leg circuit with resistance R 2, R3 and capacitor C 2.
Analog filtering amplifying circuit module 301-1,301-2: for the signal that electrode is collected, amplify and filtering.As shown in Figure 5, the signal of 1 passage is obtained by the signal operation of No. 1 point of electrode 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 and is carried out differential amplification respectively after R1, C2, R15, C14, C8 low-pass filtering by U2 the 1st foot (IN), the 4th foot (+IN).U2 the 2nd foot (Rg), the 3rd foot (Rg) connecting resistance Rg1 are used for regulating amplification.The 5th foot (Vs), the 8th foot (+Vs) connect respectively power module 501-2.5V ,+2.5V running voltage, and capacitor C a1, Ca3 are for decoupling.The 6th foot (REF) ground connection.Signal after the 7th foot (Vout) output is amplified.Signal through U2 has amplified 40dB.
Capacitor C 111, C101 and resistance R 4 form the high pass filter that cut-off frequency is 20Hz.
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.The 5th foot (+INB), the 6th foot (INB), the 7th foot (VoutB) are second amplifier.The 7th foot (V-), the 8th foot (V+) meet respectively power module 501-2.5V ,+2.5V, and the running voltage of U3 is provided.Capacitor C 5, C13 are for decoupling.The 7th foot (VoutB) output final signal.
High pass filter and quadravalence chebyshev low-pass filter are equivalent to the band filter that a passband is 20 ~ 380Hz, and amplify and finally amplify altogether 58dB through two-stage.
The 2nd passage to the 8 passages are identical with first passage.
Electrode 401: can be attached to skin surface, for gathering array electromyogram picture.As shown in Figure 6, on 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.Between two row's electrodes, be through hole, diameter 2mm, center of circle spacing 10mm.Circuit line width 0.25mm.
Power module 501: for whole harvester provides voltage, 3.7-12V external input voltage can be depressurized to+3.3V ,+2.5V, tri-kinds of voltages of-2.5V.As shown in Figure 7, BT1 is that 6V battery is as power supply.
Voltage transitions chip U3 is for external input voltage is converted to+3.3V.The 1st foot (Vin) connects external input voltage, and C26 is decoupling capacitor.The 2nd foot (GND) ground connection.The 3rd foot (EN) connects external input voltage, enables chip.The 4th foot (BYP) connects C31 shunt capacitance to reduce output ripple.The 5th foot (Vout) is+3.3V output voltage that capacitor C 27 is filter capacitor.
Voltage transitions chip U4 is for external voltage is converted to+2.5V.The 1st foot (Vin) connects external input voltage, and C28 is decoupling capacitor.The 2nd foot (GND) ground connection.The 3rd foot (EN) connects external input voltage, enables chip.The 4th foot (BYP) connects C33 shunt capacitance to reduce output ripple.The 5th foot (Vout) is+2.5V output voltage that capacitor C 29 is filter capacitor.
Voltage transitions chip U2 is for external voltage is converted to-2.5V.The 1st foot (COMP) connects capacitance compensation capacitor C 23.The 2nd foot (GND) ground connection.The 3rd foot (Vin), the 4th foot (EN) connect external input voltage after meeting electric capacity R10, and capacitor C 30 is for decoupling.The 5th foot (IN) connects external input voltage, and capacitor C 34 is for decoupling.The 6th foot (SW) is switching inverter output, forms feedback circuit with inductance L 1, small-signal Schottky diode D1, resistance R 9, R11, capacitor C 25, the 9th foot (FB).The 7th foot (PS_GND) ground connection.The 8th foot (OUT) output-2.5V voltage.The 10th foot (VREF) forms feedback reference voltage circuit with resistance R 7, capacitor C 24.
Reference electrode module 601: as shown in Figure 8, only have an electrode to form, be connected with the ground of array surface myoelectric image harvester.During use, be affixed on the less position of people's specific surface muscular tissue, 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 realizes by one or more array surface myoelectric image harvesters, and the method is specially:
1, worn array myoelectricity image acquisition device, the array electrode module that is about to 16 passages of array surface myoelectric image harvester is attached to the following position of human body elbow, and reference electrode is attached in wrist.
2, initialize: start array myoelectricity image acquisition device, after initializing, prepare to start to gather.
3,16 channel array electrodes are divided into two 8 channel array electrodes, each 8 channel array electrode gathers eight common-mode signals between adjacent two electrodes and between last electrode and ground as input signal, and 16 channel array electrodes gather 16 input signals altogether.
4,16 input signals that step 3 gathers enter respectively 16 analog filtering amplifying circuits of two analog filtering amplifying circuit modules.Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then pass through secondary differential amplification.
5, the signal through step 4 secondary differential amplification enters respectively two A/D modular converters, by two A/D modular converters, is converted to digital signal, often converts once and just to main controller MCU, sends the request that once completes.
6, two A/D converters adopt the mode of preemptive type spi bus to main controller MCU transmission data.When arbitrary A/D converter data transaction completes, to MCU, be sent completely request immediately.MCU receives that settling signal is the SPI interface of this A/D converter of gating, shields the SPI interface of another A/D converter, and the concurrent order of losing one's life receives the transformation result of this A/D converter.If another A/D converter completes data transaction when the current A/D converter that carries out transfer of data does not complete transfer of data, by waiting for after the current A/D converter that is transmitting data completes transfer of data, seize immediately spi bus, and start transmission.Temporal control will there will not be the situation of loss of data to occur.
7, in data processing module, main controller MCU processes the data that receive, and can the data of 16 passages be 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 amplifying circuit modules, 2 A/D modular converters, 1 data processing module and 1 power module etc.; Wherein,
The array electrode of described 16 passages is comprised of two 8 channel array electrodes, and each 8 channel array electrode is comprised of 8 electrodes, can gather 8 tunnel electromyographic signals;
Described reference electrode module consists of an electrode, is reference ground;
Described analog filtering amplifying 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; A passage in 8 channel array electrodes of each analog filtering amplifying circuit and front end is connected; The small-signal that analog filtering amplifying circuit module collects electrode is carried out the interfering signal beyond filtering 20-380Hz after one-level differential amplification, then passes through secondary differential amplification; 16 road signal parallel transmission, do not interfere with each other;
Described A/D modular converter comprises a high-speed a/d converter that can carry out 8 channel parallel data collections, by the 8 road signal conversion codings that amplify through analog filtering, is digital signal; The order that the SPI interface of A/D converter sends for the main controller MCU that receives reply data processing module and the data that convert are sent;
Described data processing module comprises a main controller MCU, and it is responsible for sending order and the data that convert in A/D converter being read in to laggard row date processing by spi bus to A/D converter, and sends by another road spi bus;
Be converted to+3.3V of the 3.7-12V DC voltage DC voltage that power module provides outside is supplied with the running voltage of main controller MCU and A/D converter, and ± 2.5V DC voltage is supplied with 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 realizes by one or more array surface myoelectric image harvesters, it is characterized in that, the method is specially:
(1) worn array myoelectricity image acquisition device, the array electrode module that is about to 16 passages of array surface myoelectric image harvester is attached to the following position of human body elbow, and reference electrode is attached in wrist;
(2) initialize: start array myoelectricity image acquisition device, after initializing, prepare to start to gather;
(3) 16 channel array electrodes are divided into two 8 channel array electrodes, each 8 channel array electrode gathers eight common-mode signals between adjacent two electrodes and between last electrode and ground as input signal, and 16 channel array electrodes gather 16 input signals altogether;
(4) 16 input signals that step 3 gathers enter respectively 16 analog filtering amplifying circuits of two analog filtering amplifying circuit modules; Interfering signal after one-level differential amplification beyond filtering 20-380Hz, then pass through secondary differential amplification;
(5) signal through step 4 secondary differential amplification enters respectively two A/D modular converters, by two A/D modular converters, is converted to digital signal, often converts once and just to main controller MCU, sends the request that once completes;
(6) two A/D converters adopt the mode of preemptive type spi bus to main controller MCU transmission data; When arbitrary A/D converter data transaction completes, to MCU, be sent completely request immediately; MCU receives that settling signal is the SPI interface of this A/D converter of gating, shields the SPI interface of another A/D converter, and the concurrent order of losing one's life receives the transformation result of this A/D converter; If another A/D converter completes data transaction when the current A/D converter that carries out transfer of data does not complete transfer of data, by waiting for after the current A/D converter that is transmitting data completes transfer of data, seize immediately spi bus, and start transmission; Temporal control will there will not be the situation of loss of data to occur;
(7) in data processing module, main controller MCU processes the data that receive, and can the data of 16 passages be sent by another SPI mouth.
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| CN104224170A (en) * | 2014-09-15 | 2014-12-24 | 浙江大学 | Array type flexible surface electromyography electrode and preparation method thereof |
| CN105434088A (en) * | 2016-01-08 | 2016-03-30 | 武汉工程大学 | Artificial limb surface electromyogram signal acquisition system based on wireless sensor networks |
| CN106371371A (en) * | 2016-11-03 | 2017-02-01 | 南京航空航天大学 | Electromyographic signal, mechanical signal and high speed image simultaneous acquisition system and method |
| CN106845464A (en) * | 2017-03-22 | 2017-06-13 | 中国科学院深圳先进技术研究院 | A kind of back pain Symptomatic classification system and method based on Sample Entropy |
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