CN105496403A - USB (universal serial bus) brain electric signal acquisition system on basis of DSP (digital signal processing) framework - Google Patents
USB (universal serial bus) brain electric signal acquisition system on basis of DSP (digital signal processing) framework Download PDFInfo
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- CN105496403A CN105496403A CN201410489357.0A CN201410489357A CN105496403A CN 105496403 A CN105496403 A CN 105496403A CN 201410489357 A CN201410489357 A CN 201410489357A CN 105496403 A CN105496403 A CN 105496403A
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Abstract
The invention discloses a USB (universal serial bus) brain electric signal acquisition system on the basis of a DSP (digital signal processing) framework. The USB brain electric signal acquisition system comprises a brain electrode module, an amplification and hardware filter unit module, a DSP signal acquisition and preprocessing module, a USB interface circuit module, a PC (personal computer) and a disease cause analysis and diagnosis module, and is structurally characterized in that brain electric signals can be received by the brain electrode module, can be filtered and amplified by the amplification and hardware filter module and then can be transmitted to the DSP signal acquisition and preprocessing module; the DSP signal acquisition and preprocessing module is connected with the USB interface circuit module, the USB interface circuit module is further connected with the PC, and disease causes can be ultimately obtained. Brain electric signal simulation, conversion and preprocessing circuits of the USB brain electric signal acquisition system include a preamplifier circuit, a high-pass filter circuit, a photoelectric isolation circuit, a 50HZ trap circuit, a low-pass filter circuit, a main amplification and level increasing circuit and an A/D (analog/digital) conversion circuit. The USB brain electric signal acquisition system has the advantages that the USB brain electric signal acquisition system and a laptop can be connected with each other to acquire the brain electric signals, so that a portable brain electric signal monitoring analyzer can be formed, and the USB brain electric signal acquisition system has excellent practical value.
Description
Technical field
The present invention is applied in the clinical diagnosis of brain electromedicine, teaching and scientific research field, relates to a kind of USB eeg signal acquisition system based on DSP framework particularly.
Background technology
The acquisition process of EEG signals is the important branch in biomedical engineering, and it provides required data for EEG research and clinical diagnosis, analysis.Current brain electric information extracts and can be applied in some diseases (epilepsy) diagnosis or brain Electricity Functional (as cognition) research, electroencephalogram has irreplaceable effect in the location of the diagnosis of epilepsy, classification, epileptogenic focus and treatment, it is not only Diagnosis of Epilepsy, the classification of epilepsy, the strong foundation of epilepsy localization, and the medication of epileptic can be instructed, or the objective judgement standard of antiepileptic curative effect.Therefore for meeting the needs of the clinical diagnosis of brain electromedicine, teaching and scientific research, research and the design of carrying out eeg signal acquisition processing system are very necessary.
Along with the development of computer technology, people can extract than directly relying on the more accurate characteristic parameter of Visual Observations Observations EEG waveform to analyze EEG signals, rely on the traditional method of visual diagnostic EEG gradually to make way for more accurate computer " pattern recognition " method.This problem is according to the feature of EEG signals, utilize high-speed dsp as data collection and analysis device, and utilize USB interface to computer to carry out data transmission, devise the eeg signal acquisition processing system of the traditional instruments such as the oscillograph in alternative biological experiment, monitor, amplifier.This system is by designed in conjunction for the powerful processing capacity of the advantage of traditional instrument and DSP, computer.
Summary of the invention
The present invention is exactly for the problems referred to above, make up the deficiencies in the prior art, provide a kind of USB eeg signal acquisition system based on DSP framework, the present invention can be connected collection EEG signals with portable notebook, form portable brain electric signal monitoring analyser, there is good practical value.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
A kind of USB eeg signal acquisition system based on DSP framework of the present invention, comprising brain electrode module, amplification and hardware filtering unit module, DSP signals collecting and pretreatment module, usb circuit module, PC and the large module of analyzing and diagnosing cause of disease module six; Its structural feature is: brain electrode module receives EEG signals and carries out filter and amplification by the amplification of setting and hardware filtering unit module, then sends DSP signals collecting and pretreatment module to; DSP signals collecting is connected with usb circuit module with pretreatment module, and usb circuit module is connected with PC again, finally draws the cause of disease.
The present invention arranges EEG signals analog-converted pre-process circuit, comprising pre-amplification circuit, high-pass filtering circuit, photoelectric isolating circuit, 50HZ trap circuit, low-pass filter circuit, main amplification and level lifting, A/D change-over circuit.
As a preferred embodiment of the present invention, the collection of described EEG signals is by special biosensor.
As another kind of preferred version of the present invention, described pre-amplification circuit adopts differential circuit structure, and pre-amplification circuit has high input impedance, high cmrr, low noise, low drifting performance.
Further, described pre-amplification circuit adopts chip AD620, and input adopts super β treatment technology, has low input bias current, low noise, high accuracy, higher Time Created, low power consumption characteristic; Common mode rejection ratio can reach 130dB, is suitable as very much Medical Instruments preamplifier and uses; Calculate by analysis, this circuit has good gain and common mode inhibition capacity.
As another preferred version of the present invention, the DSP that described DSP signals collecting and pretreatment module adopt is TMS320F2812, TMS320F2812 is the fixed point 32 bit DSP chip on the C2000 platform of American TI Company release, and dominant frequency 150MHZ, handling property can reach 150MIPS; Chip itself with 12 high-resolution a/d converter of 2 × 8 passages, the conversion time of 80ns.
The invention has the beneficial effects as follows.
The present invention adopts high-speed dsp as CPU, internal resource and peripheral hardware are all very abundant, the actual needs of eeg signal acquisition system can well be met, and utilize USB interface to computer to carry out data transmission, the eeg signal acquisition processing system of the traditional instruments such as the oscillograph in alternative biological experiment, monitor, amplifier, can meet the needs of the clinical diagnosis of brain electromedicine, teaching and scientific research.
Eeg signal acquisition system of the present invention can be connected collection EEG signals with portable notebook, thus forms portable brain electric signal monitoring analyser, has good practical value.
Accompanying drawing explanation
Fig. 1 is the EEG Processing flow chart of a kind of USB eeg signal acquisition system based on DSP framework of the present invention.
Fig. 2 is the EEG signals analog-converted pre-process circuit theory diagram of a kind of USB eeg signal acquisition system based on DSP framework of the present invention.
Detailed description of the invention
As shown in Figure 1, be the EEG Processing flow chart of a kind of USB eeg signal acquisition system based on DSP framework of the present invention.Figure comprises brain electrode module, amplification and hardware filtering unit module, DSP signals collecting and pretreatment module, usb circuit module, PC and the large module of analyzing and diagnosing cause of disease module six; Brain electrode module receives EEG signals and carries out filter and amplification by the amplification of setting and hardware filtering unit module, then sends DSP signals collecting and pretreatment module to; DSP signals collecting is connected with usb circuit module with pretreatment module, and usb circuit module is connected with PC again, finally draws the cause of disease.
As shown in Fig. 2 embodiment, it is the EEG signals analog-converted pre-process circuit theory diagram of a kind of USB eeg signal acquisition system based on DSP framework of the present invention.The present invention arranges EEG signals analog-converted pre-process circuit, comprising pre-amplification circuit, high-pass filtering circuit, photoelectric isolating circuit, 50HZ trap circuit, low-pass filter circuit, main amplification and level lifting, A/D change-over circuit.Described pre-amplification circuit adopts differential circuit structure, and pre-amplification circuit has high input impedance, high cmrr, low noise, low drifting performance.Described pre-amplification circuit adopts chip AD620, and input adopts super β treatment technology, has low input bias current, low noise, high accuracy, higher Time Created, low power consumption characteristic; Common mode rejection ratio can reach 130dB, is suitable as very much Medical Instruments preamplifier and uses; Calculate by analysis, this circuit has good gain and common mode inhibition capacity.
Claims (5)
1. based on a USB eeg signal acquisition system for DSP framework, comprising brain electrode module, amplification and hardware filtering unit module, DSP signals collecting and pretreatment module, usb circuit module, PC and the large module of analyzing and diagnosing cause of disease module six; It is characterized in that: brain electrode module receives EEG signals and carries out filter and amplification by the amplification of setting and hardware filtering unit module, then sends DSP signals collecting and pretreatment module to; DSP signals collecting is connected with usb circuit module with pretreatment module, and usb circuit module is connected with PC again, finally draws the cause of disease.
2. a kind of USB eeg signal acquisition system based on DSP framework according to claim 1, is characterized in that: the collection of described EEG signals is by special biosensor.
3. a kind of USB eeg signal acquisition system based on DSP framework according to claim 1, is characterized in that: described pre-amplification circuit adopts differential circuit structure.
4. a kind of USB eeg signal acquisition system based on DSP framework according to claim 3, is characterized in that: described pre-amplification circuit adopts chip AD620, and input adopts super β treatment technology.
5. a kind of USB eeg signal acquisition system based on DSP framework according to claim 1, it is characterized in that: the DSP that described DSP signals collecting and pretreatment module adopt is TMS320F2812, TMS320F2812 is the fixed point 32 bit DSP chip on the C2000 platform of American TI Company release, and dominant frequency 150MHZ, handling property can reach 150MIPS; Chip itself with 12 high-resolution a/d converter of 2 × 8 passages, the conversion time of 80ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410489357.0A CN105496403A (en) | 2014-09-24 | 2014-09-24 | USB (universal serial bus) brain electric signal acquisition system on basis of DSP (digital signal processing) framework |
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| CN201410489357.0A CN105496403A (en) | 2014-09-24 | 2014-09-24 | USB (universal serial bus) brain electric signal acquisition system on basis of DSP (digital signal processing) framework |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106236081A (en) * | 2016-08-24 | 2016-12-21 | 滁州学院 | Portable brain electric instrument based on DSP, ARM |
| CN106859643A (en) * | 2017-02-24 | 2017-06-20 | 北京体育大学 | A kind of system of study movement person's pre-games brain electricity feature and sports achievement correlation |
-
2014
- 2014-09-24 CN CN201410489357.0A patent/CN105496403A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106236081A (en) * | 2016-08-24 | 2016-12-21 | 滁州学院 | Portable brain electric instrument based on DSP, ARM |
| CN106859643A (en) * | 2017-02-24 | 2017-06-20 | 北京体育大学 | A kind of system of study movement person's pre-games brain electricity feature and sports achievement correlation |
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Application publication date: 20160420 |