TWI795869B - A method of auscultation using brain waves - Google Patents

Abstract

A method of auscultation using brain waves. The method provides a brain wave auscultation device. A brain wave acquisition unit of the brain wave auscultation device is placed in the brain of a subject to obtain an original brain wave signal of the subject. And transmitted to a signal processing unit, the signal processing unit filters the original electroencephalogram signal based on a frequency band reservation standard to generate a signal to be processed, the frequency band reservation standard defines the following bands as reserved parts: δ band, θ band, α band, β band and γ band, the signal processing unit shifts a center frequency of the signal to be processed to the audible range of the human ear, and then spreads the spectrum of the signal to be processed after the shift to form a signal to be loudspeaker , the frequency range of the signal to be speaker is 20 Hz to 20k Hz, and then a speaker unit is used to generate sound based on the signal to be speaker.

Description

A method of auscultation using brain waves

The invention relates to a method for auscultation using brain waves, in particular to a brain wave auscultation method for doctors to quickly diagnose brain waves by hearing.

With the advancement of medical technology, brain wave examination has become a common diagnostic method in the clinical diagnosis and treatment of neurological patients. Since the brain contains tens of thousands of neurons, the neurons are tightly connected, and through the transmission of electrical signals, people can move, think, sleep, etc. The Department of Neurology uses brain wave equipment to record the activity of nerve cells in the brain Signal flow and changes in brainwave patterns can be used to judge the patient's brain function and related diseases, and even the current emotional state. However, the existing brain wave examination usually needs to wait for a period of time before returning to the clinic to listen to the report results. The conventional method cannot implement the identification of the brain wave frequency band, so that the patient cannot know the current state of the body at the time of medical treatment, and the doctor cannot immediately when the patient seeks medical treatment. Treat patients accordingly.

Furthermore, the existing brain wave detection is mostly presented in the form of waveform data, and the brain wave data cannot provide doctors with intuitive diagnosis results. Doctors must rely on the interpretation of the information by the doctor, and then provide the analysis results to the patient. Once the doctor has insufficient experience in brain wave analysis, it will easily lead to slow interpretation of the doctor's data and affect the speed of consultation.

The main purpose of the present invention is to solve the problem that conventional electroencephalogram detection cannot provide intuitive diagnosis results.

In order to achieve the above object, the present invention provides a method for auscultation using brain waves, including: Step 1: providing a brain wave auscultation device, the brain wave auscultation device includes a brain wave capture unit, and a brain wave capture unit connected signal processing unit, and a speaker unit connected to the signal processing unit; Step 2: placing the brain wave capture unit on the brain of a subject to obtain an original brain wave signal of the subject and transmit it to The signal processing unit, after obtaining the original electroencephalogram signal, the signal processing unit filters the original electroencephalogram signal based on a frequency band reservation standard to generate a signal to be processed, and the frequency band reservation standard defines the following bands as reserved parts: δ band, θ band, α band, β band, and γ band, the signal processing unit shifts a central frequency of the signal to be processed to the audible range of the human ear, and then spreads the spectrum of the shifted signal to be processed to forming a speaker-to-be-speaker signal, the frequency range of the speaker-to-be-speaker signal is 20 Hz to 20k Hz; and step 3: making the speaker unit emit sound based on the speaker-to-be-speaker signal.

In one embodiment, the signal processing unit shifts the center frequency to 1k Hz.

In one embodiment, the second step further includes the following sub-step: using an amplification circuit to perform signal amplification processing on the original electroencephalogram signal.

In one embodiment, the signal processing unit spreads all bands of the signal to be processed based on complex spreading ratios, and each of the spreading ratios acts on one of the bands of the signal to be processed.

In an embodiment, the spreading ratios are different.

In one embodiment, the signal processing unit spreads the frequency spectrum of the signal to be processed based on a phase-locked loop technique and a voltage-controlled oscillator modulation technique.

In one embodiment, the signal processing unit is based on a phase-locked loop technique, a voltage-controlled oscillator modulation technique, and at least one of the following cooperative techniques. The frequency of the signal to be processed is For spectrum spreading, the cooperative technique can be an input frequency modulator, an output modulation technique, or a frequency divider modulation technique.

According to the foregoing disclosure, compared with the conventional technology, the present invention has the following characteristics: the present invention presents brain waves in the form of sound, providing doctors with a more intuitive way to obtain brain wave detection results. At the same time, by means of the sound processing technology provided by the method of the present invention, the center frequency of the spectrum of the signal to be processed is transferred to the audible range of the human ear, so that the signal to be processed is converted into the signal to be loudspeaker that can be dialed out by the speaker .

10: A method of auscultation using brain waves

11: Step 1

12: Step 2

13: Step 3

20: Brain wave auscultation device

21: Brain wave acquisition unit

211: Original brain wave signal

22: Signal processing unit

24:Speaker unit

25: Amplifying circuit

26: filter

261: Pending signal

27: Spread spectrum unit

271: Waiting for the sound signal

272: lock to the circuit

273: Spread spectrum clock generator

274:Voltage Controlled Oscillator

275: Phase selector circuit

277: frequency divider

80: Patient

Fig. 1 is a schematic flowchart of the steps of the first embodiment of the present invention.

FIG. 2 is a schematic diagram of an implementation of the present invention using a brain wave capture unit to capture brain waves.

Fig. 3 is a schematic diagram of the structural unit of the first embodiment of the present invention.

Fig. 4 is a schematic diagram of the structural unit of the second embodiment of the present invention.

Fig. 5 is a schematic diagram of the implementation of the present invention.

The detailed description and technical content of the present invention are described as follows with reference to the drawings: Please refer to FIGS. The electroencephalogram auscultation device 20 includes an electroencephalogram acquisition unit 21, a signal processing unit 22 connected to the electroencephalogram acquisition unit 21, and a speaker unit 24 connected to the signal processing unit 22; step two 12: The electroencephalogram acquisition unit 21 is placed in the brain of a subject 80 to obtain an original electroencephalogram signal 211 of the subject 80 and transmit it to the signal processing unit 22, and the signal processing unit 22 obtains the original electroencephalogram signal After 211, based on a frequency band protection The reserved reference filters the original brain wave signal 211 and generates a signal 261 to be processed. The frequency band reserved reference defines the following bands as reserved parts: δ band, θ band, α band, β band and γ band. The signal processing unit 22 After a central frequency of the signal to be processed 261 is shifted to the audible range of the human ear, the spectrum of the shifted signal to be processed 261 is spread to form a signal to be loudspeaker 271, the frequency of the signal to be loudspeaked 271 The range is from 20 Hz to 20k Hz; and step 3 13: making the speaker unit 24 emit a sound based on the signal to be speaker 271 .

For specific description, please refer to FIG. 2 to FIG. 4. At the beginning of the implementation, the brain wave capture unit 21 is placed on the brain of the examinee 80, and the brain wave capture unit 21 can be pasted on the scalp of the examinee 80 in multiples. Electrode pads, or a wearable device worn on the brain of the subject 80 , the electroencephalogram capture unit 21 captures the electroencephalogram data of the subject 80 to obtain the original electroencephalogram signal 211 . Moreover, since the original brainwave signal 211 is actually quite weak, in one embodiment, after the brainwave acquisition unit 21 obtains the original brainwave signal 211, it can first use an amplifying circuit 25 to analyze the original brainwave signal 211. The signal 211 undergoes signal amplification processing, and then transmits the amplified original electroencephalogram signal 211 to the signal processing unit 22 . In addition, the original electroencephalogram signal 211 obtained by the electroencephalogram acquisition unit 21 is an analog signal, and the signal processing unit 22 works as a digital signal, so the electroencephalogram acquisition unit 21 sends the signal to the signal processing unit 22 Before transmitting the original electroencephalogram signal 211 , the original electroencephalogram signal 211 needs to be converted from an analog signal to a digital signal for the signal processing unit 22 to perform signal processing.

Next, the signal processing unit 22 uses a filter 26 to filter the original electroencephalogram signal 211. The filter 26 retains some bands of the original electroencephalogram signal 211 based on a frequency band reservation criterion. The part of the band is delta band (0.15 Hz to 3 Hz), theta band (4 Hz to 8 Hz), alpha band (8 Hz to 14 Hz), β wave band (14 Hz to 28 Hz) and γ wave band (28 Hz to 70 Hz), that is to say, the filter 26 filters out the sudden bursts in the original brain wave signal 211 whose frequency is 0.15 Hz to 70 Hz. Waves and noises, so that the original brain wave signal 211 is converted into a signal 261 to be processed with δ band, θ band, α band, β band and γ band.

Further, the signal processing unit 22 takes the center frequency of the frequency spectrum of the signal to be processed 261 as the reference point of the signal to be processed 261, and shifts the center frequency to the audible range of the human ear, for example, around 1k Hz. The rest of the signal 261 migrates to other frequency bands synchronously with the center frequency and maintains a frequency difference from the center frequency. After the signal processing unit 22 transfers the signal to be processed 261, a spread spectrum unit 27 is used to spread the spectrum of the transferred signal 261 to be processed. The spread spectrum unit 27 may be composed of some electronic components of the signal processing unit 22, Or implemented with an independent physical circuit. When the spectrum spreading unit 27 is the physical circuit, because the signal type of the spectrum spreading unit 27 is an analog signal, before the signal processing unit 22 transmits the signal 261 to be processed to the spectrum spreading unit 27, the signal processing unit 22 Convert the signal to be processed 261 converted into an analog signal. After receiving the signal 261 to be processed, the spectrum spreading unit 27 expands the frequency spectrum of the signal 261 to be processed, so that the frequency range of the signal 261 to be processed falls between 20 Hz and 20k Hz, and converts its frequency into The signal 271 to be loudspeaker within the audible range of the human ear. In step 3 13, after the brainwave auscultation device 20 transmits the signal to be spoken 271 to the speaker unit 24, the speaker unit 24 can dial out a sound based on the signal to be spoken 271, so that doctors and other medical personnel The current state of the brain wave of the examinee 80 can be judged based on the voice dialed out by the speaker unit 24 .

Accordingly, the present invention provides the physician with an auditory diagnosis of the brain wave state of the examinee 80 without performing interpretation and analysis based on the brain wave data of the examinee 80, thereby allowing the physician to see a doctor in a more convenient and intuitive manner. At the same time, the auscultation method 10 using brain waves provided by the present invention, by shifting the center frequency of the signal 261 to be processed, At the same time, the frequency spectrum of the signal to be processed 261 is expanded, so that the original electroencephalogram signal 211 captured by the present invention can be sounded through the speaker unit 24 .

，其中，f_out為該待處理訊號261調變後頻率，f_in為該待處理訊號261調變前頻率，n為整數。 In one embodiment, please refer to FIG. 4 and FIG. 5, when the signal processing unit 22 performs spectrum spreading on the signal to be processed 261, the signal processing unit 22 uses complex The spreading ratios are used to spread the spectrum in all the bands of the signal to be processed 261, and the spreading ratios can be the same or different, and each of the spreading ratios acts on all the bands in the signal to be processed 261 . Specifically, when the signal processing unit 22 performs spectrum spreading, the spreading unit 27 can use a lock-in loop technology, and at the same time match an input frequency modulator technology, a voltage controlled oscillator modulation technology, and an output modulation technology, or a frequency divider modulation technology for frequency extension. First explain the aforementioned technology, please refer to FIG. 5 , in the lock-in loop technology, the spread spectrum unit 27 uses a lock-in loop 272 to provide the lock-in loop technology, and the lock-in loop 272 fixes the signal 261 to be processed waveforms, so that the phase difference between the δ band, θ band, α band, β band and γ band of the signal to be processed 261 is fixed. In the input frequency modulator technology, the spread spectrum unit 27 uses a spread spectrum clock generator 273 to modulate the input signal 261 to be processed after the locked loop 272 fixes the waveform of the signal to be processed 261 frequency, so that the signal to be processed 261 is expanded into the signal to be spoken 271 . In addition, in terms of the voltage-controlled oscillator modulation technology, the signal processing unit 22 can be implemented through a voltage-controlled oscillator 274 in the spectrum spreading unit 27, and the voltage-controlled oscillator 274 fixes the After the waveform of the signal to be processed 261 is obtained, the voltage of the signal to be processed 261 can be adjusted by the spread spectrum clock generator 273, so that the frequency of the signal to be processed 261 can be expanded. In this embodiment, the voltage controls the oscillation The modulator modulation technology and the input frequency modulator technology can act on each band with different spread spectrum ratios. In addition, as far as the output modulation technology is concerned, the present invention can be implemented by using a phase selector circuit 275 in the spectrum spreading unit 27, and the phase selector circuit 275 also fixes the waveform of the signal to be processed 261 in the lock-in loop 272 On the premise of delaying the phase difference of the signal to be processed 261 , thereby modulating the frequency of the signal to be processed 261 . In another embodiment, the present invention can also provide the VCO modulation technique through a delay circuit (not shown in the figure), as shown in FIG. 5 . In yet another embodiment, the present invention provides the frequency divider modulation technology through a frequency divider 277. The frequency divider 277 modulates the frequency of the signal to be processed 261 through a calculation formula, so that the signal to be processed 261 is When the waveform is fixed, the frequency spectrum of the signal to be processed 261 can be extended. The calculation formula is as follows:

, wherein, f _out is the frequency of the signal to be processed 261 after modulation, _fin is the frequency of the signal to be processed 261 before modulation, and n is an integer.

Further, when the signal processing unit 22 performs spectrum spreading, it may have different selection modes based on the different modulation techniques provided by the spreading unit 27, for example, the frequency spreading mode 1 to the frequency spreading mode depicted in FIG. 5 4. Taking frequency extension mode 1 as an example, the frequency spreading unit 27 provides the lock-in loop technology through the lock-in loop 272, and then uses the frequency spreading clock generator 273 and the voltage-controlled oscillator 274 to spread the signal 261 to be processed spectrum, so that the pending signal 261 is converted into the pending speaker signal 271. Taking frequency extension mode 2 as an example, the spectrum spreading unit 27 spreads the frequency spectrum of the signal to be processed 261 through the voltage controlled oscillator 274 after fixing the phase difference of each band in the signal to be processed 261 . In the frequency extension mode 3, the frequency spreading unit 27 uses the lock-in loop 272 to cooperate with the phase selector circuit 275 or the delay circuit to spread frequency, and then utilizes the frequency divider 277 and the frequency spreading clock generator 273 with the VCO 274. In addition, in the frequency extension mode 4, the frequency spreading unit 27 uses the lock-in loop 272 to provide the lock-in loop technology, and then uses the frequency divider 277, The spread spectrum clock generator 273 and the voltage controlled oscillator 274 perform spectrum spread. As can be seen from the above, when the spread spectrum unit 27 implements the spread spectrum technique, the phase-locked loop technology and the voltage-controlled oscillator modulation technique can be used as the basis of the spread spectrum technique, and the input frequency modulator technology is matched with the output frequency modulator. Modulation technology, or the frequency divider modulation technology and other technologies for collaborative processing. At the same time, the present invention converts the signal to be processed 261 into the signal to be loudspeaker 271 whose frequency falls within the audible range of the human ear. The spread spectrum unit 27 can be implemented by selecting different synergistic technologies according to requirements, and the selected frequency can also be changed. Therefore, the spectrum spreading unit 27 of the present invention makes the frequency spreading ratio set between the voltage controlled oscillator modulation technique and the aforementioned synergy technique be set to be different.

In summary, it is only a preferred embodiment of the present invention, and should not limit the scope of the present invention, that is, all equivalent changes and modifications made according to the patent scope of the present invention should still belong to the present invention patent coverage.

10: A method of auscultation using brain waves 11: Step 1 12: Step 2 13: Step 3

Claims (4)

A method for auscultation using electroencephalograms, comprising: Step 1: providing an electroencephalogram auscultation device, the electroencephalogram auscultation device includes an electroencephalogram acquisition unit, a signal processing unit connected to the electroencephalogram acquisition unit, and a Connecting the speaker unit of the signal processing unit; step 2: placing the brain wave capture unit in the brain of a subject to obtain an original brain wave signal of the subject and transmit it to the signal processing unit, the signal processing After the unit obtains the original electroencephalogram signal, it filters the original electroencephalogram signal based on a frequency band reservation standard to generate a signal to be processed. The frequency band reservation standard defines the following bands as reserved parts: δ band, θ band, α band, β band and γ band, the signal processing unit shifts a center frequency of the signal to be processed to 1k Hz, and the rest of the signal to be processed moves to other frequency bands along with the center frequency, and maintains a frequency difference from the center frequency , the signal processing unit uses a spread spectrum unit to spread the spectrum of the signal to be processed after migration, and the spread spectrum unit uses a phase-locked loop technology to fix the δ-band, θ-band, α-band, β-band and γ-band Phase difference, and spread spectrum for each band with a complex number of spread spectrum ratios, these spread spectrum ratios can be the same or different, each of these spread spectrum ratios acts on one of the bands of the signal to be processed, and makes The signal to be processed after spreading forms a signal to be speaker, and the frequency range of the signal to be speaker is 20 Hz to 20k Hz; and step 3: make the speaker unit emit sound based on the signal to be speaker. A method for auscultation using electroencephalogram as described in claim 1, wherein, in the second step, the signal processing unit obtains the original electroencephalogram signal, and uses an amplification circuit to perform signal amplification processing on the original electroencephalogram signal. A method for auscultation using brainwaves as described in claim 1, wherein the signal processing unit further performs spectrum expansion on the signal to be processed based on a voltage-controlled oscillator modulation technique. A method for auscultation using brainwaves as described in claim 1, wherein the signal processing unit performs spectrum spreading on the signal to be processed based on the phase-locked loop technology, a voltage-controlled oscillator modulation technology, and at least one of the following collaborative technologies , the cooperative technique can be an input frequency modulator technique, an output modulation technique, or a frequency divider modulation technique.

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