WO2020153515A1 - 음장감을 개선한 바이노럴 비트의 음향 출력 장치 및 그 방법 - Google Patents
음장감을 개선한 바이노럴 비트의 음향 출력 장치 및 그 방법 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/369—Electroencephalography [EEG]
- A61B5/372—Analysis of electroencephalograms
- A61B5/374—Detecting the frequency distribution of signals, e.g. detecting delta, theta, alpha, beta or gamma waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/369—Electroencephalography [EEG]
- A61B5/377—Electroencephalography [EEG] using evoked responses
- A61B5/38—Acoustic or auditory stimuli
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
- A61M21/02—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2503/00—Evaluating a particular growth phase or type of persons or animals
- A61B2503/12—Healthy persons not otherwise provided for, e.g. subjects of a marketing survey
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
- A61M2021/0005—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus
- A61M2021/0027—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus by the hearing sense
- A61M2021/0033—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus by the hearing sense subsonic
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/04—Heartbeat characteristics, e.g. ECG, blood pressure modulation
- A61M2230/06—Heartbeat rate only
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/08—Other bio-electrical signals
- A61M2230/10—Electroencephalographic signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/07—Synergistic effects of band splitting and sub-band processing
Definitions
- the present invention relates to a binaural beat sound output device and a method for improving the sound field feeling, and more specifically, to receive desired music from a user, and apply a binaural bit to a specific frequency band to obtain a desired EEG as a stereo sound source.
- the present invention relates to an EEG sound output device using a binaural beat that can provide a stereo sound source while inducing a state and improve the sound field feeling without rejection or monotony of music.
- the human brain is known to emit different frequencies according to each state. When a signal of a certain frequency is continuously received from the outside through sound or light, the brain waves also have an effect of synchronizing with the input frequency. Generally, when the human brain is meditating, the mind and body are relaxed, and when the mind is focused, the brain is activated.
- Binaural beat is a principle that induces a desired brain wave in the brain by using a difference between two frequencies.
- a binaural bit is a band of audible frequency (20 to 20,000 Hz) that a human can listen to an input audio signal to form an external wave affecting the brain because a human cannot perceive a low frequency. It refers to a sound that is effectively combined to modulate to sound and affect the brain.
- the sound in the 11 Hz band belonging to the alpha stage is an inaudible frequency band that cannot be heard by humans, and stereo sound is used to provide sound in the 300 Hz band, which is an audible frequency band to the left ear, and 1 Hz by supplying sound in the 311 Hz band to the right ear. It gives a frequency difference of.
- the two sounds are combined in the brain to accept the difference of 1 Hz, and the stimulation of brain wave induction is made.
- Human brain waves are electrical signals that originate from the surface of the head, the source of which is the current generated by ions passing through the cell membrane of excitatory neurons. It is possible to measure the EEG and determine a person's psychological state according to the frequency range of the measured EEG, and different psychological states are represented according to each frequency range.
- the frequency range when the frequency range is less than 0.4 to 4 Hz, it is shown as a delta wave, and a very deep sleep state.
- the frequency range When the frequency range is 4 to 8 Hz, it is shown as a sleep, meditation state as the theta wave, and the frequency range is 8 to.
- it When it is 14 Hz, it appears as an alpha wave in a relaxed state, and when the frequency range is 15 to 24 Hz, it appears as a beta wave in a tense state.
- the frequency of the brain represents the psychological state of a person changing from time to time, and artificially inducing the person's psychological state based on a study that the person's actual psychological state changes when a person's brain waves are changed with a forced EEG. To do this, binaural beats have been used.
- a binaural beat is generated through frequency shift for a desired frequency band to generate a sound composed of a binaural beat for music desired by a user. I can listen.
- Korean Patent Registration No. 10-1406531 (a device and method for generating a binaural bit from a stereo audio signal)
- distortion of a stereo audio signal can be prevented while generating a binaural bit from a stereo audio signal.
- Devices and methods are disclosed.
- the present invention has been devised to solve the problems of the prior art as described above, and receives a music desired by a user, and applies a binaural bit to a specific frequency band to induce a desired EEG state with a stereo sound source while being a stereo sound source. It is possible to provide an EEG sound output device and method using a binaural beat, which improves the sound field feeling without rejection or monotony of music.
- a binaural beat sound output device with improved sound field includes: a sound source input unit 100 that receives sound source data consisting of a first stereo sound source signal and a second stereo sound source signal; and the sound source data.
- the frequency converter constituting each sound source signal by receiving the received signal, receiving the first mono sound signal, the second stereo sound signal, and the first mono sound signal by converting the first mono sound signal into a mono conversion signal 200
- a frequency control unit 300 generating a second mono sound signal by shifting a specific frequency band of a frequency band constituting the first mono sound signal by a predetermined frequency, and the specific frequency of the first stereo sound signal.
- the band is removed and the specific frequency band of the first mono sound signal is added to generate a first stereo output signal, the specific frequency band of the second stereo sound signal is removed, and the specific frequency of the second mono sound signal is removed. It is preferable to include an output audio generator 400 that generates a second stereo output signal by adding a band.
- the binaural beat sound output device with improved sound field further comprises an integrated control unit 500 for varying the specific frequency band or the predetermined frequency according to user manipulation or preset mode information. It is desirable to be.
- the specific frequency band is selected from a frequency band of 500 to 6000 Hz, and the predetermined frequency is an EEG to be derived, within a frequency range of any one of the alpha, beta, theta, or delta frequency ranges. It is preferred that it is a frequency.
- the integrated control unit 500 sets an EEG to be induced according to a user's manipulation or mode information input from the user, and sets an EEG induction sequence to induce the EEG.
- the binaural beat sound output device having improved sound field feeling includes an EEG sensor unit 600 including an EEG sensor detecting a user's current EEG state and a heart rate sensor detecting a user's current heart rate. It is further configured to further include a heart rate sensor unit 700, and the integrated control unit 500 receives the current EEG state of the user detected by the EEG sensor unit 600, and sequentially determines the EEG induction sequence to induce EEG. In addition, it is preferable to receive the user's current heart rate detected by the heart rate sensor unit 700 and to change the reproduction speeds of the first stereo output signal and the second stereo output signal.
- the integrated control unit 500 receives the current EEG state of the user detected by the EEG sensor unit 600, and the order of EEG induction to the EEG to be derived from the current EEG state of the user is the frequency of the EEG. It is preferable to control the frequency control unit 300 so as to be sequentially induced from a high state to a low state or from a low state to a high state.
- the binaural beat sound output device with improved sound field further comprises sound output means 800 for converting and outputting the first stereo output signal and the second stereo output signal into sound, wherein the Preferably, the sound corresponding to the first stereo output signal is output to one side of the sound output means 800, and the sound corresponding to the second stereo output signal is output to the other side of the sound output means 800.
- sound output means 800 for converting and outputting the first stereo output signal and the second stereo output signal into sound, wherein the sound corresponding to the first stereo output signal is output to one side of the sound output means 800, and the sound corresponding to the second stereo output signal is output to the other side of the sound output means 800.
- the sound output method of the binaural beat having improved sound field feeling includes, at a sound source input unit, sound source data consisting of a first stereo sound source signal and a second stereo sound source signal that are pre-stored or input from the outside.
- the input sound source input step the mono conversion unit receives the sound source data, converts it into a first mono sound source signal, and generates a mono sound.
- the frequency control unit In the frequency control unit, the first stereo sound source signal, the second stereo sound source signal, and the 1 A frequency band analysis step of analyzing a frequency band formed by receiving a mono source signal, and the frequency control unit shifts a specific frequency band among the frequency bands constituting the first mono source signal by a predetermined frequency, thereby causing a second mono source signal
- the output audio generation unit removes the specific frequency band of the first stereo sound source signal and adds the specific frequency band of the first mono sound source signal to generate a first stereo output signal. It consists of an output audio generation step of removing the specific frequency band of the second stereo sound source signal and adding the specific frequency band of the second mono sound source signal to generate a second stereo output signal. It is preferable to further include a control step of varying the specific frequency band or the predetermined frequency according to preset mode information.
- the specific frequency band is selected from a frequency band of 500 to 6000 Hz, and the predetermined frequency is an EEG to be derived, within a frequency range of any one of the alpha, beta, theta, or delta frequency ranges. It is preferred that it is a frequency.
- control step comprises a user input step of setting an EEG to be induced, and setting an EEG induction sequence so that the set EEG is induced, according to user manipulation or mode information input from the user. desirable.
- the sound output method of the binaural beat that improves the sound field feeling is an integrated control unit, an EEG detection step of detecting a user's current EEG state using an EEG sensor, and an integrated control unit using a heart rate sensor. Further comprising a heart rate detection step for detecting the heart rate, the control step is received by the current state of the brain wave of the detected user, the brain wave induction sequence determining step of sequentially determining the brain wave induction sequence to induce the brain wave and the detected user It is preferred that the present invention comprises a speed variable step of receiving the heart rate and varying the reproduction speeds of the first stereo output signal and the second stereo output signal.
- control step receives the detected current EEG state of the user, and the order of EEG induction to the EEG to be derived from the current EEG state of the user is high, low to high, or low to high. It is preferable to control the frequency shift step so as to be sequentially induced in a state.
- the binaural beat sound output device and method for improving the sound field of the present invention receive the music desired by the user, and apply the binaural bit to a specific frequency band to obtain a desired brainwave state as a stereo sound source. It has the advantage of being able to provide a stereo sound source while inducing it, thereby minimizing the pulsation phenomenon by improving the sound field without rejection or monotony of music.
- FIG. 1 is a view showing the configuration of a sound output device of a binaural beat with improved sound field according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a frequency band spectrum of a sound source signal in a sound output device of a binaural beat with improved sound field feeling and a method according to an embodiment of the present invention.
- FIG. 3 is a view showing an order of brain wave induction to an EEG to be induced in a sound output device of a binaural beat with improved sound field according to an embodiment of the present invention and a method thereof.
- 4 and 5 is a flow chart showing a sound output method of the binaural beat with improved sound field feeling according to an embodiment of the present invention.
- a system refers to a set of components, including devices, mechanisms and means, organized and regularly interacted to perform the necessary functions.
- a binaural beat sound output device and a method for improving sound field can induce induction into brain waves in order to target music desired by a user using a binaural beat, and a specific frequency band of music It relates to an apparatus and a method that can improve and provide sound field feeling with a stereo sound source, not a mono sound source, without rejection or monotony without being aware of the distortion of the sound source by applying only the binaural beat.
- FIG. 1 is a block diagram showing a sound output device of a binaural beat with improved sound field according to an embodiment of the present invention, with reference to FIG. 1, a binaural with improved sound field according to an embodiment of the present invention
- the sound output device of the beat will be described in detail.
- a binaural beat sound output device with improved sound field includes a sound source input unit 100, a mono conversion unit 200, a frequency control unit 300, and output audio. It is preferable to include a generator 400 and an integrated controller 500.
- Each of the components is preferably operated through a terminal means controlled through a single MCU, but this is only an embodiment of the present invention, and in some cases controlled through each MCU connected through a wired or wireless network. It may also operate through terminal means.
- the sound source input unit 100 receives sound source data including a first stereo sound source signal and a second stereo sound source signal.
- the sound source input unit 100 receives a desired external sound source from a user, or receives sound source data selected from a user among sound source data stored in advance in the sound source storage unit.
- the sound source data is generally composed of a stereo sound source, it is preferable to consist of the first stereo sound source signal and the second stereo sound source signal without a separate conversion process.
- the sound source input unit 100 converts the external sound source input as an analog signal to a digital signal using an analog-to-digital converter (ADC). It is preferred.
- ADC analog-to-digital converter
- the mono conversion unit 200 receives the sound source data and converts it to a mono sound source to generate a first mono sound source signal.
- the mono conversion unit 200 is preferably a stereo sound source to extract the mono sound source from the sound source data to generate the first mono sound source signal.
- the sound source component on either side selected from the left or right component of the audio component composed of stereo as the mono sound source may be extracted as a mono sound source by mixing the stereo components.
- the frequency control unit 300 is for each of the first stereo sound source signal, the second stereo sound source signal and the first mono sound source signal received from the mono conversion unit 200 received from the sound source input unit 100 It is desirable to analyze the frequency bands being formed. At this time, the analysis of the frequency band means that a frequency component formed by performing Fourier transform on each is obtained.
- the frequency control unit 300 preferably generates a second mono sound signal by extracting a specific frequency band among the frequency bands constituting the first mono sound signal, and shifting the extracted specific frequency band by a predetermined frequency.
- the frequency shift is most preferably implemented using a DSP.
- the frequency control unit 300 of the binaural beat sound output device having improved sound field according to an embodiment of the present invention is controlled by the integrated control unit 500, according to a user's operation or preset mode information,
- the second mono sound source signal is generated by variably setting the specific frequency band or the predetermined frequency. That is, the frequency control unit 300 sets the frequency band and frequency amount to be shifted in consideration of the frequency of the EEG to be induced and controls the set frequency band and frequency amount under the control of the integrated control unit 500.
- the second mono sound source signal may be generated by shifting a set frequency band component of a frequency band constituting one mono sound source signal by a set frequency amount.
- the integrated control unit 500 sets a brain wave to be induced by applying a binaural bit according to a user's manipulation or mode information (desired brain wave state information) input from the user, and the set brain wave (induction) It is desirable to set the order of EEG induction so that the desired EEG) is induced.
- the binaural beat sound output device with improved sound field includes a brain wave sensor unit 600 and a heart rate sensor unit 700 as shown in FIG. 1. It is desirable to be.
- the EEG sensor unit 600 is preferably configured to include an EEG sensor that detects a user's current EEG state
- the heart rate sensor unit 700 is configured to include a heart rate sensor that detects a user's current heart rate. It is preferred.
- the EEG sensor unit 600 may be implemented in the form of a hair band or an attachment pin to contact the user's head, or may be included as a separate component in the headphones.
- the heart rate sensor unit 700 may be embodied as a wrist band to be attached to a user's wrist, or may be embodied as a conventional electrode attached to a chest or neck.
- the integrated control unit 500 receives the current EEG state of the user detected by the EEG sensor unit 600, and sequentially induces the EEG set according to the user's manipulation or mode information received from the user. It is desirable to determine the order of induction for EEG.
- the integrated control unit 500 receives the current EEG state of the user sensed by the EEG sensor unit 600, and sets the user's current EEG state according to user manipulation or mode information received from the user. It is preferable to control the frequency control unit 300 such that the order of the EEG induction to the target EEG is sequentially induced from a high state to a low state or a low state to a high state.
- the EEG induction sequence refers to an EEG induction sequence from a user's current EEG state detected by the EEG sensor unit to a target EEG desired by the user, and sequentially increases the frequency of EEG (delta wave-theta wave-AL) It is preferable to control the frequency control unit 300 so as to be guided in the order of papa-beta wave and lowering (beta wave-alpha wave-theta wave-delta wave).
- the integrated control unit 500 directly transmits the delta wave to the frequency control unit 300.
- the frequency control unit 300 may be controlled so that a delta wave state is induced through a beta-alpha-theta-wave.
- the integrated control unit 500 has a frequency shift so that the beta wave state is induced from the frequency control unit 300 through theta wave-alpha wave. It is desirable to control so that it can be achieved.
- the integrated control unit 500 receives the current heart rate of the user sensed by the heart rate sensor unit 700 and variably controls the reproduction speeds of the first stereo output signal and the second stereo output signal. That is, when the user is stable and the current heart rate is slow, it is desirable to play the audio slowly to help induce the brain wave state of the user to the delta state.
- the first stereo output signal and the second stereo output signal will be described later.
- the frequency control unit 300 preferably generates the second mono sound signal by variably setting the specific frequency band or the predetermined frequency under the control of the integrated control unit 500.
- the human hearing is known to have a discrimination limit of 0.3% in frequency variation from 500 to 6000 Hz. That is, in the frequency range between 500 and 6000 Hz, the human hearing ability can discriminate between 1.5 and 18 Hz frequency changes, and when the frequency is shifted using a binaural bit, the frequency range between 500 and 6000 Hz When the frequency is shifted by 0.3% or more, the change in sound quality is recognized.
- the binaural beat sound output device with improved sound field does not allow a user to recognize a change in sound quality of a sound source due to frequency shift, so that the lower limit of the shifting frequency band is within 0.3%. It is desirable to set it to a value.
- the frequency band and frequency amount to be shifted are related to the frequency of the EEG to be induced.
- the amount of frequency shifted using a binaural bit proceeds in a frequency band within the range of 8 to 14 Hz. It is preferable, and it is preferable to set the lower limit to a value within the range of 8 to 14/0.3%, that is, 2667 to 4667 Hz as the frequency band to be shifted.
- Table 1 below relates to a target EEG intended to be induced by a user using a binaural beat sound output device with improved sound field according to an embodiment of the present invention, and thus a desired amount of transition frequency and a lower limit of the transition frequency band. will be.
- EEG state to be induced Frequency Lower limit of the transition frequency band EEG condition frequency Delta 0.4 to 4 Hz 0.4 to 4 Hz 133 ⁇ 1333 Hz Thetapa 4 to 8 Hz 4 to 8 Hz 1333 ⁇ 2667 Hz Alpha wave 8 ⁇ 14 Hz 8 ⁇ 14 Hz 2667 ⁇ 4667 Hz Beta wave 15 ⁇ 24 Hz 15 ⁇ 24 Hz 5000 to 8000 Hz
- the integrated control unit 500 to generate a sound source signal for inducing to the desired EEG (target EEG state) set by the user's manipulation or mode information (desired EEG state information) input from the user,
- the frequency band it is preferable to set the frequency band to be shifted and the amount of frequency to be shifted with reference to the values in Table 1 above.
- the frequency control unit 300 generates the second mono sound signal by frequency shifting the first mono sound signal according to the setting of the integrated control unit 500.
- the binaural beat sound output device having improved sound field feeling does not provide a mono sound source, but transmits a stereo sound source as described above, thereby improving the sound field feeling and pulsating. And the sound quality can be improved.
- the output audio generation unit 400 the first stereo sound source signal and the second stereo sound source signal, the specific frequency band is removed and the first mono sound source signal before each transition to the corresponding part It is preferable to mix with the second mono sound source signal after transition.
- the output audio generator 400 removes the specific frequency band of the first stereo sound source signal and adds the specific frequency band of the first mono sound source signal to generate a first stereo output signal, and the It is preferable to generate the second stereo output signal by removing the specific frequency band of the second stereo sound source signal and adding the specific frequency band of the second mono sound source signal.
- the first stereo output signal and the second stereo output signal generated through the output audio generation unit 400 are the input stereo sound source, but the mono sound source is only for a specific frequency band of the sound source signal.
- the mono sound source is only for a specific frequency band of the sound source signal.
- FIG. 2 is a view showing a frequency band spectrum before and after transition by a sound output device of a binaural beat with improved sound field according to an embodiment of the present invention.
- the EEG to be derived when the EEG to be derived is set by the user's manipulation or the mode information (desired EEG state information) input from the user in the integrated control unit 500, the EEG transitions to induce the EEG of the user to the alpha wave.
- the frequency amount is set to 10 Hz and the frequency band to be shifted is set to 500 to 2000 Hz
- the frequency band between 500 and 2000 Hz of the first mono sound source signal is shifted by 10 Hz by the frequency control unit 300 Moving from 510 to 2010 Hz, a second mono sound source signal is generated.
- the frequency band to be shifted is set to 500 to 2000 Hz, but this is only an embodiment of the present invention.
- the lower limit of the frequency band to be shifted is set to 3333 Hz, and frequency shifting can be performed for the higher bands.
- one of the first or second stereo sound source signals selected by the output audio generation unit 400 is mixed as a first mono sound source signal in a set frequency band, and among the first or second stereo sound source signals
- the other has the advantage of being able to induce desired brain waves smoothly while being provided to the user as a stereo sound source by mixing a second mono sound source signal in a set frequency band.
- the binaural beat sound output device with improved sound field is preferably configured to further include sound output means 800.
- the sound output means 800 may convert and output the first stereo output signal and the second stereo output signal to sound.
- the sound corresponding to the first stereo output signal is output to one side of the sound output means 800, and the sound corresponding to the second stereo output signal is output to the other side of the sound output means 800. It is preferable to be output, and the sound output means 800 may be implemented as an audio amplifying stage for driving connected headphones or earphones.
- the binaural beat sound output device with improved sound field is preferably configured to further include user means, as shown in FIG. 1.
- a user's manipulation command (direct input of a desired EEG state or a mode input of an EEG state) is input, or a target EEG to be induced according to the current EEG state, EEG state and manipulation command, and currently in progress It is preferred that a display for the order of EEG induction is made.
- FIGS. 4 and 5 are flowcharts showing a sound output method of a binaural beat with improved sound field according to an embodiment of the present invention, with reference to FIGS. 4 and 5, sound field feeling according to an embodiment of the present invention
- the sound output method of the improved binaural beat will be described in detail.
- a sound output method of a binaural beat with improved sound field includes a sound source input step, a mono generation step, a frequency band analysis step, a frequency shift step, and an output audio generation step. It is preferably made to include, it is preferable to control the frequency shift step through a control step.
- the sound source input unit 100 may receive the sound source data including a first stereo sound source signal and a second stereo sound source signal, which are pre-stored or input from the outside.
- the inputting of the sound source it is preferable to receive a desired external sound source from a user, or to receive sound source data selected from a user among sound source data previously stored in a sound source storage unit.
- the sound source data is generally composed of a stereo sound source, it is preferable to consist of the first stereo sound source signal and the second stereo sound source signal without a separate conversion process.
- ADC analog-to-digital converter
- the mono conversion unit 200 may receive the sound source data and convert it to the first mono sound source signal to generate it.
- the stereo sound source extracts the mono sound source from the sound source data to generate the first mono sound signal.
- the sound source component on either side selected from the left or right component of the audio component composed of stereo as the mono sound source may be extracted as a mono sound source by mixing the stereo components.
- the frequency control unit 300 may receive the first stereo sound source signal, the second stereo sound source signal, and the first mono sound source signal, and analyze the frequency band formed.
- the analysis of the frequency band means that a frequency component formed by performing Fourier transform on each is obtained.
- the frequency controller 300 may generate the second mono sound signal by shifting a specific frequency band among a frequency band constituting the first mono sound signal by a predetermined frequency.
- the frequency shifting step it is preferable to extract a specific frequency band from among the frequency bands constituting the first mono sound source signal and to shift the extracted specific frequency band by a predetermined frequency to generate a second mono sound source signal,
- the frequency shift is most preferably implemented using a DSP.
- the specific frequency band or the predetermined frequency is varied according to the control of the control step in the frequency shift step.
- the integrated control unit 500 may variably set the specific frequency band or the predetermined frequency according to user manipulation or preset mode information.
- the frequency shifting step generates the second mono sound signal by variably setting the specific frequency band or the predetermined frequency according to the user's manipulation or preset mode information under the control of the control step. It is preferred. That is, in the frequency shifting step, according to the control of the control step, the frequency band and frequency amount to be shifted are set in consideration of the frequency of the brain wave to be derived, and the first mono sound source signal is set as much as the set frequency band and frequency amount.
- the second mono sound source signal may be generated by shifting a set frequency band component among the formed frequency bands by a set frequency amount.
- the integrated control unit 500 sets a brain wave to be induced by applying a binaural bit according to a user's manipulation or mode information (desired brain wave state information) input from the user, and sets the It is preferable to set the order of brain wave induction so that the brain wave (the brain wave to be induced) is induced.
- control step sets a brain wave to be derived according to a user's manipulation or mode information input from the user, and sets the EEG induction sequence so that the set EEG is induced. It may be configured to include an input step.
- an EEG detection step of detecting the user's current EEG state using an EEG sensor and a user's current heart rate detection using a heart rate sensor may be configured to further include a heart rate detection step.
- control step may be configured to include an EEG induction sequence determining step of receiving the detected current EEG state of the user and sequentially determining the EEG induction sequence so that the EEG is sequentially induced.
- control step determines the sequence of EEG induction for sequentially receiving the detected current EEG state of the user, and sequentially inducing the EEG set according to the user's manipulation or mode information received from the user. .
- control step receives the current EEG state of the detected user, and the EEG induction sequence from the current EEG state of the user to the target EEG set according to user manipulation or mode information received from the user is EEG. It is preferable to control the frequency shifting step so that the frequencies of S are sequentially induced from a high state to a low state or from a low state to a high state.
- the control step receives the current EEG state of the user detected by the EEG detection step, and the EEG induction sequence from the current EEG state of the user to the target EEG set according to the user's manipulation or mode information received from the user. , It is preferable to control the frequency shift step so that the frequency of the EEG is sequentially induced from a high state to a low state or from a low state to a high state.
- the EEG induction sequence means the EEG induction sequence from the current EEG state of the user sensed by the EEG detection step to the target EEG desired by the user. It is preferable to control the frequency shift step so as to be induced in the order of papa-beta wave) and lowering (beta wave-alpha wave-theta wave-delta wave).
- the control step controls the frequency shifting step to derive the delta wave state immediately.
- the frequency shift step may be controlled so that a delta-wave state is induced through a beta-alpha-theta-wave.
- the control step controls the frequency shift step so that the frequency shift can be performed so that the beta wave state is induced through theta wave-alpha wave. It is preferred.
- control step further includes a variable speed step of receiving the detected user's current heart rate and variably controlling the reproduction speeds of the first stereo output signal and the second stereo output signal. It is desirable to do. That is, when the user is stable and the current heart rate is slow, it is desirable to play the audio slowly to help induce the brain wave state of the user to the delta state.
- the second mono sound signal by variably setting the specific frequency band or the predetermined frequency in the frequency shifting step through the control step.
- the human hearing is known to have a discrimination limit of 0.3% in frequency variation from 500 to 6000 Hz. That is, in the frequency range between 500 and 6000 Hz, the human hearing ability can discriminate between 1.5 and 18 Hz frequency changes, and when the frequency is shifted using a binaural bit, the frequency range between 500 and 6000 Hz When the frequency is shifted by 0.3% or more, the change in sound quality is recognized.
- the lower limit of the frequency band to be shifted is within 0.3% so that the user does not recognize the sound quality change of the sound source even by frequency shift. It is desirable to set it to a value.
- the frequency band and frequency amount to be shifted are related to the frequency of the EEG to be induced.
- the amount of frequency shifted using a binaural bit proceeds in a frequency band within the range of 8 to 14 Hz. It is preferable, and it is preferable to set the lower limit to a value within the range of 8 to 14/0.3%, that is, 2667 to 4667 Hz as the frequency band to be shifted.
- control step is the first step of generating a sound source signal for inducing to a desired EEG (target EEG state) set by the user's manipulation or mode information (desired EEG state information) input from the user.
- a desired EEG target EEG state
- mode information desired EEG state information
- the second mono sound signal is generated by frequency shifting the first mono sound signal according to the control setting of the control step.
- the sound output method of the binaural beat with improved sound field does not provide a mono sound source, but transmits a stereo sound source to improve the sound field feeling, thereby improving the pulsation and sound quality degradation.
- the output audio generation step after removing the specific frequency band for the first stereo sound source signal and the second stereo sound source signal and transitioning to the first mono sound source signal before transitioning only the corresponding portion, respectively It is preferable to mix with the second mono sound source signal.
- the output audio generator 400 removes the specific frequency band of the first stereo sound source signal and adds the specific frequency band of the first mono sound source signal to add the first stereo. It is preferable to generate an output signal, remove the specific frequency band of the second stereo sound source signal, and add the specific frequency band of the second mono sound source signal to generate a second stereo output signal.
- the generated first stereo output signal and the second stereo output signal are the same as the received stereo sound source, but by applying a binaural bit of a mono sound source only to a specific frequency band of the sound source signal, to a desired brainwave state. While inducing, it is possible to induce the EEG state desired by the user without distortion or sound quality of the sound source and without feeling of rejection or monotony.
- FIG. 2 is a view showing a frequency band spectrum before and after transition by a sound output method of a binaural beat with improved sound field according to an embodiment of the present invention.
- the control step when the brainwave to be derived is set by the user's manipulation or the mode information (desired brainwave state information) input from the user, when the brainwave to be derived is an alpha file, the amount of frequency to be shifted to induce the user's brainwaves to the alpha wave is 10.
- the frequency band to be shifted is set to 500 to 2000 Hz
- the frequency band between 500 and 2000 Hz of the first mono sound source signal is shifted by 10 Hz through the frequency shifting step to move from 510 to 2010 Hz.
- a second mono sound source signal is generated.
- the frequency band to be shifted is set to 500 to 2000 Hz, but this is only an embodiment of the present invention.
- the lower limit of the frequency band to be shifted is set to 3333 Hz, and frequency shifting can be performed for the higher bands.
- one of the first or second stereo sound source signals selected by the output audio generation step is mixed as a first mono sound source signal in a set frequency band, and the other of the first or second stereo sound source signals is By mixing as a second mono sound source signal in the set frequency band, there is an advantage in that induction to a desired brainwave can be smoothly provided while being provided to the user as a stereo sound source.
- first stereo output signal and the second stereo output signal generated by the output audio generation step may be converted into sound through the sound output means 800 and output.
- the sound corresponding to the first stereo output signal is output to one side of the sound output means 800, and the sound corresponding to the second stereo output signal is output to the other side of the sound output means 800. It is preferable to be output, and the sound output means 800 may be implemented as an audio amplifying stage for driving connected headphones or earphones.
- the progress (progress) of each step may be transmitted to the user means or the user's input information may be received.
- a user's manipulation command (direct input of a desired EEG state or a mode input of an EEG state) is input, or a target EEG to be induced according to the current EEG state, EEG state and manipulation command, and currently in progress It is preferred that a display for the order of EEG induction is made.
- the binaural beat sound output device and the method for improving the sound field according to an embodiment of the present invention and the method, the binaural monophonic sound source only for a specific frequency band of the sound source signal while maintaining the received stereo sound source
- the beat it is possible to induce the desired EEG state, but without the distortion or sound quality of the sound source, the user can induce the desired EEG state without feeling of rejection or monotony.
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Abstract
Description
유도하고자 하는 뇌파 상태(목표 뇌파 상태) | 주파수량 | 천이 주파수 대역의 하한 | |
뇌파 상태 | 주파수 | ||
델타파 | 0.4 ~ 4 Hz | 0.4 ~ 4 Hz | 133 ~ 1333 Hz |
세타파 | 4 ~ 8 Hz | 4 ~ 8 Hz | 1333 ~ 2667 Hz |
알파파 | 8 ~ 14 Hz | 8 ~ 14 Hz | 2667 ~ 4667 Hz |
베타파 | 15 ~ 24 Hz | 15 ~ 24 Hz | 5000 ~ 8000 Hz |
Claims (12)
- 제1 스테레오 음원신호와 제2 스테레오 음원신호로 이루어지는 음원 데이터를 입력받는 음원 입력부(100);상기 음원 데이터를 전달받아, 제1 모노 음원신호로 변환하여 생성하는 모노 변환부(200);상기 제1 스테레오 음원신호, 제2 스테레오 음원신호 및 제1 모노 음원신호를 전달받아 각각의 음원신호를 이루고 있는 주파수 대역을 분석하고, 상기 제1 모노 음원신호를 이루고 있는 주파수 대역 중 특정 주파수 대역을 소정의 주파수만큼 천이시켜 제2 모노 음원신호를 생성하는 주파수 제어부(300); 및상기 제1 스테레오 음원신호의 상기 특정 주파수 대역을 제거하고 상기 제1 모노 음원신호의 상기 특정 주파수 대역을 더하여 제1 스테레오 출력신호를 생성하고, 상기 제2 스테레오 음원신호의 상기 특정 주파수 대역을 제거하고 상기 제2 모노 음원신호의 상기 특정 주파수 대역을 더하여 제2 스테레오 출력신호를 생성하는 출력 오디오 생성부(400);를 포함하여 구성되는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 1항에 있어서,상기 음장감을 개선한 바이노럴 비트의 음향 출력 장치는사용자의 조작 또는 기설정된 모드 정보에 따라, 상기 특정 주파수 대역 또는 상기 소정의 주파수를 가변하는 통합 제어부(500);를 더 포함하여 구성되는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 2항에 있어서,상기 특정 주파수 대역은500 ~ 6000 Hz의 주파수 대역에서 선택되며,상기 소정의 주파수는유도하고자 하는 뇌파로서, 알파파, 베타파, 세타파 또는 델타파의 주파수 범위 중 어느 하나의 주파수 범위 내의 주파수인 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 3항에 있어서,상기 통합 제어부(500)는사용자의 조작 또는 사용자로부터 입력되는 모드 정보에 따라, 유도하고자 하는 뇌파를 설정하고,설정한 상기 뇌파가 유도되도록 뇌파유도 순서를 설정하는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 4항에 있어서,상기 음장감을 개선한 바이노럴 비트의 음향 출력 장치는사용자의 현재 뇌파 상태를 감지하는 뇌파 센서를 포함하는 뇌파 센서부(600); 및사용자의 현재 심장 박동수를 감지하는 심박 센서를 포함하는 심박 센서부(700);를 더 포함하여 구성되며,상기 통합 제어부(500)는상기 뇌파 센서부(600)에서 감지된 사용자의 현재 뇌파 상태를 전달받아, 순차적으로 뇌파가 유도되도록 뇌파유도 순서를 결정하고,상기 심박 센서부(700)에서 감지된 사용자의 현재 심장 박동수를 전달받아, 상기 제1 스테레오 출력신호와 제2 스테레오 출력신호의 재생속도를 가변하는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 5항에 있어서,상기 통합 제어부(500)는상기 뇌파 센서부(600)에서 감지된 사용자의 현재 뇌파 상태를 전달받아, 사용자의 현재 뇌파 상태에서 유도하고자 하는 뇌파로의 뇌파유도 순서가, 뇌파의 주파수가 높은 상태에서 낮은 상태로 또는 낮은 상태에서 높은 상태로 순차적으로 유도되도록 상기 주파수 제어부(300)을 제어하는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 제 1항에 있어서,상기 음장감을 개선한 바이노럴 비트의 음향 출력 장치는상기 제1 스테레오 출력신호와 제2 스테레오 출력신호를 음향으로 변환하여 출력하는 음향 출력수단(800);을 더 포함하여 구성되며,상기 음향 출력수단(800)의 일측으로는 상기 제1 스테레오 출력신호에 대응하는 음향이 출력되고, 상기 음향 출력수단(800)의 타측으로는 상기 제2 스테레오 출력신호에 대응하는 음향이 출력되는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 장치.
- 음원 입력부에서, 기저장된 또는 외부로부터 입력되는, 제1 스테레오 음원신호와 제2 스테레오 음원신호로 이루어지는 음원 데이터를 입력받는 음원 입력단계;모노 변환부에서, 상기 음원 데이터를 전달받아, 제1 모노 음원신호로 변환하여 생성하는 모노 생성단계;주파수 제어부에서, 상기 제1 스테레오 음원신호, 제2 스테레오 음원신호 및 제1 모노 음원신호를 전달받아 이루고 있는 주파수 대역을 분석하는 주파수 대역 분석단계;주파수 제어부에서, 상기 제1 모노 음원신호를 이루고 있는 주파수 대역 중 특정 주파수 대역을 소정의 주파수만큼 천이시켜 제2 모노 음원신호를 생성하는 주파수 천이단계;출력 오디오 생성부에서, 상기 제1 스테레오 음원신호의 상기 특정 주파수 대역을 제거하고 상기 제1 모노 음원신호의 상기 특정 주파수 대역을 더하여 제1 스테레오 출력신호를 생성하고, 상기 제2 스테레오 음원신호의 상기 특정 주파수 대역을 제거하고 상기 제2 모노 음원신호의 상기 특정 주파수 대역을 더하여 제2 스테레오 출력신호를 생성하는 출력 오디오 생성단계;로 이루어지되,통합 제어부에서, 사용자의 조작 또는 기설정된 모드 정보에 따라, 상기 특정 주파수 대역 또는 상기 소정의 주파수를 가변하는 제어단계;를 더 포함하여 이루어지는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 방법.
- 제 8항에 있어서,상기 특정 주파수 대역은500 ~ 6000 Hz의 주파수 대역에서 선택되며,상기 소정의 주파수는유도하고자 하는 뇌파로서, 알파파, 베타파, 세타파 또는 델타파의 주파수 범위 중 어느 하나의 주파수 범위 내의 주파수인 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 방법.
- 제 9항에 있어서,상기 제어단계는사용자의 조작 또는 사용자로부터 입력되는 모드 정보에 따라, 유도하고자 하는 뇌파를 설정하고,설정한 상기 뇌파가 유도되도록 뇌파유도 순서를 설정하는 사용자 입력단계;를 포함하여 구성되는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 방법.
- 제 10항에 있어서,상기 음장감을 개선한 바이노럴 비트의 음향 출력 방법은통합 제어부에서, 뇌파 센서를 이용하여 사용자의 현재 뇌파 상태를 감지하는 뇌파 감지단계; 및통합 제어부에서, 심박 센서를 이용하여 사용자의 현재 심장 박동수를 감지하는 심박 감지단계;를 더 포함하고,상기 제어단계는감지된 사용자의 현재 뇌파 상태를 전달받아, 순차적으로 뇌파가 유도되도록 뇌파유도 순서를 결정하는 뇌파유도 순서 결정단계; 및감지된 사용자의 현재 심장 박동수를 전달받아, 상기 제1 스테레오 출력신호와 제2 스테레오 출력신호의 재생속도를 가변하는 속도 가변단계;를 포함하여 구성되는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 방법.
- 제 11항에 있어서,상기 제어단계는감지된 사용자의 현재 뇌파 상태를 전달받아, 사용자의 현재 뇌파 상태에서 유도하고자 하는 뇌파로의 뇌파유도 순서가, 뇌파의 주파수가 높은 상태에서 낮은 상태로 또는 낮은 상태에서 높은 상태로 순차적으로 유도되도록 상기 주파수 천이단계를 제어하는 것을 특징으로 하는 음장감을 개선한 바이노럴 비트의 음향 출력 방법.
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PCT/KR2019/001008 WO2020153515A1 (ko) | 2019-01-24 | 2019-01-24 | 음장감을 개선한 바이노럴 비트의 음향 출력 장치 및 그 방법 |
JP2021542114A JP2022518736A (ja) | 2019-01-24 | 2019-01-24 | 音場感を改善したバイノーラルビートの音響出力装置およびその方法 |
KR1020217018582A KR102499848B1 (ko) | 2019-01-24 | 2019-01-24 | 음장감을 개선한 바이노럴 비트의 음향 출력 장치 및 그 방법 |
EP19911976.9A EP3905726A4 (en) | 2019-01-24 | 2019-01-24 | BINAURAL RHYTHM OUTPUT DEVICE WITH IMPROVED SOUND FIELD AND METHOD THEREOF |
US17/424,980 US11778402B2 (en) | 2019-01-24 | 2019-01-24 | Binaural beat sound output device having improved sound field and method therefor |
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PCT/KR2019/001008 WO2020153515A1 (ko) | 2019-01-24 | 2019-01-24 | 음장감을 개선한 바이노럴 비트의 음향 출력 장치 및 그 방법 |
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US (1) | US11778402B2 (ko) |
EP (1) | EP3905726A4 (ko) |
JP (1) | JP2022518736A (ko) |
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KR20100133151A (ko) * | 2009-06-11 | 2010-12-21 | 주식회사 오디녹스 | 바이노럴 비트 주파수를 이용한 학습용 오디오신호 생성 방법 및 장치 |
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JP2017111414A (ja) * | 2015-12-16 | 2017-06-22 | ディーロジックス カンパニー リミテッドDlogixs Co.,Ltd | バイノーラルビートを用いた脳波誘導オーディオ装置及び方法 |
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JP2750502B2 (ja) * | 1993-09-15 | 1998-05-13 | 雄司 奥山 | リラックス集中誘導装置、録音装置、録音媒体及び放送装置 |
US20070282216A1 (en) * | 2004-11-30 | 2007-12-06 | Vesely Michael A | Altering brain activity through binaural beats |
US7674224B2 (en) * | 2005-10-14 | 2010-03-09 | Vitrepixel Holdings, Llc | Method for incorporating brain wave entrainment into sound production |
WO2009139011A1 (en) * | 2008-05-15 | 2009-11-19 | Akanemo S.R.L. | Binaural audio and processing of audio signals |
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2019
- 2019-01-24 WO PCT/KR2019/001008 patent/WO2020153515A1/ko unknown
- 2019-01-24 EP EP19911976.9A patent/EP3905726A4/en not_active Withdrawn
- 2019-01-24 JP JP2021542114A patent/JP2022518736A/ja active Pending
- 2019-01-24 KR KR1020217018582A patent/KR102499848B1/ko active IP Right Grant
- 2019-01-24 US US17/424,980 patent/US11778402B2/en active Active
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US6081743A (en) * | 1996-10-02 | 2000-06-27 | Carter; John Leland | Method and apparatus for treating an individual using electroencephalographic and cerebral blood flow feedback |
KR101406531B1 (ko) | 2007-10-24 | 2014-06-13 | 삼성전자주식회사 | 스테레오 오디오 신호로부터 바이노럴 비트를 발생시키는 장치 및 방법 |
KR20100133151A (ko) * | 2009-06-11 | 2010-12-21 | 주식회사 오디녹스 | 바이노럴 비트 주파수를 이용한 학습용 오디오신호 생성 방법 및 장치 |
KR20110046207A (ko) * | 2009-10-28 | 2011-05-04 | 와이드텍인코퍼레이션 주식회사 | 뇌파 유도장치 및 방법 |
JP2017111414A (ja) * | 2015-12-16 | 2017-06-22 | ディーロジックス カンパニー リミテッドDlogixs Co.,Ltd | バイノーラルビートを用いた脳波誘導オーディオ装置及び方法 |
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KR102499848B1 (ko) | 2023-02-16 |
US11778402B2 (en) | 2023-10-03 |
EP3905726A1 (en) | 2021-11-03 |
EP3905726A4 (en) | 2022-08-17 |
US20220095067A1 (en) | 2022-03-24 |
KR20210084636A (ko) | 2021-07-07 |
JP2022518736A (ja) | 2022-03-16 |
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