CN111544737A - Binaural beat sound output device with improved sound field sense and method thereof - Google Patents
Binaural beat sound output device with improved sound field sense and method thereof Download PDFInfo
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- 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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- 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
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- 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
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Abstract
The present invention relates to a binaural-beat sound output apparatus and method thereof with improved sound field sensation, and more particularly, to a brain wave sound output apparatus and method thereof using binaural beats, which receives music desired by a user, applies binaural beats to a specific frequency band, can induce a desired brain wave state with a stereo sound source, and can provide the desired brain wave state with a stereo sound source, thereby improving sound field sensation without generating a feeling of contradiction or monotony to the music.
Description
Technical Field
The present invention relates to a binaural beat sound output device and method (binaural beat sound output and method with improved sound field), and more particularly, to a electroencephalogram sound output device using binaural beats, which receives music desired by a user, applies binaural beats to a specific frequency band, and can induce a desired electroencephalogram state with a stereo sound source and provide a stereo sound source, thereby improving sound field without generating a feeling of contradiction or monotony to the music.
Background
It is known that the human brain emits different frequencies according to each state, and when a signal of a constant frequency is continuously received from the outside by sound, light, or the like, the brain wave is also in harmony with the input frequency. The brain of the general person relaxes in mind and body during meditation, and is in an activated state during concentration.
Binaural beats are the principle of inducing the desired brain waves in the brain using the difference of two frequencies.
That is, the binaural beat is a sound that is modulated from an input audio signal into a sound in an audible frequency band (20 to 20000Hz) that is heard by a human being so as to form an external wave that affects the brain because a low frequency is not perceived by the human being, and is effectively modulated so as to affect the brain.
That is, since the sound in the 11Hz band belonging to the α -level is an inaudible band that cannot be heard by humans, the sound in the 300Hz band is supplied to the left ear and the sound in the 311Hz band is supplied to the right ear by stereo sound, thereby forming a frequency difference of 1Hz, and at this time, the two sounds are accommodated in the brain and receive the difference of 1Hz, thereby realizing brain wave induction stimulation.
The human brain wave is an electrical signal generated on the surface of the head, and its origin is an electric current generated by a plurality of ions passing through the cell membrane exciting the neuron. The brain waves can be measured, and the mental state of a person can be determined from the frequency ranges of the measured brain waves, and different mental states can be presented according to the frequency ranges.
As an example, a wave is used in a frequency range of less than 0.4 to 4Hz to show a deep sleep state, a theta wave is used in a frequency range of 4 to 8Hz to show a sleep and meditation state, an alpha wave is used in a frequency range of 8 to 14Hz to show a relaxation state, and a beta wave is used in a frequency range of 15 to 24Hz to show a tension state.
In this way, the frequency of the brain shows a human mind state that changes at every moment, and when the human brain wave is changed by forced brain wave induction, the actual mind state of the human changes.
Conventionally, all signals of left (L) and Right (R) are processed into monaural signals, and then binaural beats are generated by frequency shifting of a desired frequency band, so that a user can listen to sound made of binaural beats for desired music.
However, not only inconvenience of listening to sound is caused by the beat phenomenon generated by the frequency shift phenomenon, but also a problem that stereoscopic sensation, which is indispensable for enjoying music, is completely lost in the process of converting a stereoscopic audio signal into a monaural audio signal and a problem that sound quality is degraded by monotonous sound (monaural).
In this regard, in korean patent application No. 10-1406531 ("apparatus and method for generating binaural beats from a stereoscopic audio signal"), an apparatus and method for generating binaural beats from a stereoscopic audio signal while preventing distortion of the stereoscopic audio signal are disclosed.
Korean patent application No.: no. 10-1406531 (application No. 2014.06.03).
Disclosure of Invention
[ problem to be solved ]
The present invention has been made to solve the above-described problems of the conventional art, and an object of the present invention is to provide an apparatus and a method for outputting brain wave sound using binaural beats, which receive music desired by a user, apply binaural beats to a specific frequency band, and can induce a desired brain wave state with a stereo sound source and provide the brain wave state with a stereo sound source, thereby improving a sound field feeling without generating a feeling of contradiction or monotony to the music.
[ MEANS FOR solving PROBLEMS ] to solve the problems
Preferably, a binaural beat sound output apparatus with an improved sound field feeling according to an embodiment of the present invention includes: a sound source input unit 100 that receives input of sound source data composed of a first stereo sound source signal and a second stereo sound source signal; a monaural conversion unit 200 that receives the sound source data and converts the sound source data to generate a first monaural sound source signal; a frequency control unit 300 which receives the first stereo sound source signal, the second stereo sound source signal, and the first mono sound source signal, analyzes the frequency bands constituting the sound source signals, and shifts a specific frequency band among the frequency bands constituting the first mono sound source signal by a predetermined frequency to generate a second mono sound source signal; and an output audio generating part 400 for generating a first stereo output signal by removing the specific band of the first stereo sound source signal and adding the specific band of the first mono sound source signal, and generating a second stereo output signal by removing the specific band of the second stereo sound source signal and adding the specific band of the second mono sound source signal.
Further preferably, the binaural beat sound output device with improved sound field sensation further includes an integrated control unit 500, and the integrated control unit 500 changes the specific frequency band or the predetermined frequency according to a user operation or set mode information.
Further preferably, the specific frequency band is selected from a frequency band of 500 to 6000Hz, and the predetermined frequency is a frequency in any one of frequency ranges of α wave, β wave, θ wave, and frequency range of waves as the brain wave to be induced.
Further, it is preferable that the integrated control unit 500 sets an electroencephalogram to be intentionally induced based on an operation of a user or pattern information received from the user, and sets an electroencephalogram induction sequence so that the set electroencephalogram is induced.
Further preferably, the binaural beat sound output device with improved sound field sensation further includes; a brain wave sensor part 600 including a brain wave sensor that detects a current brain wave state of the user; and a heart rate sensor unit 700 including a heart rate sensor for detecting a current heart rate of the user, wherein the integrated control unit 500 receives a current brain wave state of the user detected by the brain wave sensor unit 600, determines a brain wave induction sequence to sequentially induce brain waves, receives the current heart rate of the user detected by the heart rate sensor unit 700, and changes the playback speed of the first stereo output signal and the second stereo output signal.
Further, it is preferable that the integrated control unit 500 receives the current brain wave state of the user detected by the brain wave sensor unit 600, and controls the frequency control unit 300 such that the brain wave induction sequence from the current brain wave state of the user to the brain wave to be induced is sequentially induced from a state in which the frequency of the brain wave is high to a state in which the frequency of the brain wave is low to a state in which the frequency of the brain wave is high.
Further preferably, the binaural beat sound output device with improved sound field sensation further includes a sound output unit 800, the sound output unit 800 converting the first stereo output signal and the second stereo output signal into sound and outputting the sound, the sound corresponding to the first stereo output signal being output from one side of the sound output unit 800, and the sound corresponding to the second stereo output signal being output from the other side of the sound output unit 800.
Preferably, a binaural beat sound output method with improved sound field sensation according to an embodiment of the present invention includes: a sound source input step in which a sound source input section accepts input of sound source data composed of a first stereo sound source signal and a second stereo sound source signal, which are stored or input from the outside; a monaural sound source generating step in which a monaural converting section receives the sound source data and converts the sound source data to generate a first monaural sound source signal; a frequency band analyzing step, wherein the frequency control part receives the first stereo sound source signal, the second stereo sound source signal and the first single sound channel sound source signal and analyzes the frequency band forming the sound source signal; a frequency shifting step in which a frequency control unit shifts a specific frequency band among frequency bands constituting the first monaural sound source signal by a predetermined frequency to generate a second monaural sound source signal; and an output audio generating step of generating a first stereo output signal by removing the specific frequency band of the first stereo sound source signal and adding the specific frequency band of the first mono sound source signal, and generating a 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, and further comprising a control step of changing the specific frequency band or the predetermined frequency by an integrated control unit according to a user operation or set mode information.
Further preferably, the specific frequency band is selected from a frequency band of 500 to 6000Hz, and the predetermined frequency is a frequency in any one of frequency ranges of α wave, β wave, θ wave, and frequency range of waves as the brain wave to be induced.
Further preferably, the controlling step includes a user inputting step of setting an electroencephalogram to be intentionally induced according to an operation of a user or pattern information received from the user, and setting an electroencephalogram induction order to induce the set electroencephalogram.
Further preferably, the binaural beat sound output method with improved sound field sensation further includes; a brain wave detection step, in which the integrated control part detects the current brain wave state of the user by using a brain wave sensor; a step of determining a brain wave induction sequence, which receives the detected current brain wave state of the user and determines the brain wave induction sequence to sequentially induce brain waves; and a speed changing step of receiving the detected current heart rate of the user and changing the playing speed of the first stereo output signal and the second stereo output signal.
Further preferably, the control step receives the detected current brain wave state of the user, and controls the frequency transition step so that the brain wave induction sequence from the current brain wave state of the user to the brain wave to be induced is induced in order from a state of high brain wave frequency to a state of low brain wave frequency or from a state of low brain wave frequency to a state of high brain wave frequency.
[ Effect of the invention ]
According to the above-described configuration, the binaural beat sound output device and the method thereof having an improved sound field feeling according to the present invention have advantages in that music desired by a user is received, binaural beats are applied to a specific frequency band, a desired brain wave state can be induced by a stereo sound source, and a stereo sound source can be provided, so that a sense of contradiction or monotony to the music is not generated, and the sound field feeling is improved, thereby minimizing a beat phenomenon.
In addition, there is an advantage that sound quality degradation of a music signal or a learning audio signal to which a binaural beat is applied can be improved by improving sound field feeling.
Drawings
Fig. 1 is a diagram showing a configuration of a binaural beat sound output apparatus with an improved sound field feeling 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 binaural beat sound output apparatus and method with improved sound field feeling according to an embodiment of the present invention.
Fig. 3 is an embodiment of a sequence of brain wave induction to an intentionally induced brain wave in a binaural beat sound output apparatus and method for improving a sound field feeling according to an embodiment of the present invention.
Fig. 4 and 5 are sequence diagrams illustrating a binaural beat sound output method with improved sound field sensation according to an embodiment of the present invention.
Detailed Description
Hereinafter, a binaural beat sound output device and method for improving sound field feeling according to the present invention will be described in detail with reference to the drawings. The drawings described below are provided as examples to fully convey the concept of the invention to those skilled in the art. Therefore, the present invention is not limited to the drawings shown below, and may be implemented in various ways. In addition, like reference numerals denote like parts throughout the specification.
In this case, the technical terms and scientific terms used have meanings that are generally understood by those skilled in the art unless otherwise defined, and descriptions of known functions and structures that may unnecessarily obscure the gist of the present invention in the following description and drawings are omitted.
A system is a collection of elements including devices, mechanisms, units, and the like organized and regularly interacting to perform a desired function.
A binaural beat sound output device and method for improving a sound field sensation according to an embodiment of the present invention relates to a device and method for improving a sound field sensation by using a stereo sound source other than a monaural sound source without perceiving distortion of the sound source and without generating a haptic sensation or a monotonous sensation by inducing music desired by a user to a target brain wave using binaural beats and applying binaural beats only to a specific frequency band of the music.
In particular, providing a stereo sound source can improve sound field feeling, thereby having an advantage that not only the beat phenomenon can be minimized, but also the reduction of sound quality in the process of converting to a monaural sound source can be improved.
Fig. 1 is a block diagram showing a binaural beat sound output apparatus with improved sound field feeling according to an embodiment of the present invention, and the binaural beat sound output apparatus with improved sound field feeling according to the embodiment of the present invention will be described in detail with reference to fig. 1.
As shown in fig. 1, the binaural-beat sound output device with improved sound field sensation according to the embodiment of the present invention preferably includes a sound source input unit 100, a monaural conversion unit 200, a frequency control unit 300, an output-sound generation unit 400, and an integrated control unit 500.
Preferably, each structure operates by a terminal unit controlled by one MCU, but this is only an embodiment of the present invention, and may also operate by a plurality of terminal units controlled by each MCU connected via a wired or wireless network as the case may be.
Each structure is described in detail.
Preferably, the sound source input unit 100 receives input of sound source data including the first and second stereo sound source signals.
Preferably, the sound source input unit 100 receives an input of a desired external sound source from a user, or receives an input of sound source data selected by the user from among a plurality of sound source data stored in advance in the sound source storage unit.
In this case, the plurality of sound source data are generally configured by a stereo sound source, and thus, it is preferable that the plurality of sound source data are configured by the first and second stereo sound source signals without performing a separate conversion process.
In addition, it is preferable that the sound source input unit 100 converts the external sound source inputted as an Analog signal into a Digital signal by an Analog-to-Digital Converter (ADC) when receiving an input of the external sound source from a user.
Preferably, the monaural conversion unit 200 receives the audio source data and converts the audio source data into a monaural audio source to generate a first monaural audio source signal.
That is, preferably, the monaural conversion unit 200 extracts a monaural sound source from the sound source data including a stereo sound source to generate the first monaural sound source signal.
In this case, a sound source component on either side may be selected from the left-side component or the right-side component of an audio component composed of stereo sound to be used as the monaural sound source, or a stereo component may be mixed to extract one monaural sound source to be used as the monaural sound source.
Preferably, the frequency control unit 300 analyzes a frequency band constituting each sound source signal with respect to the first and second stereo sound source signals delivered from the sound source input unit 100 and the first monaural sound source signal delivered from the monaural sound source conversion unit 200. In this case, the frequency band analysis is to perform fourier transform on each sound source signal to obtain frequency components constituting each sound source signal.
Further, it is preferable that the frequency control unit 300 extracts a specific frequency band among frequency bands constituting the first monaural sound source signal, and shifts a predetermined frequency to the extracted specific frequency band to generate the second monaural sound source signal, and most preferably, the frequency shift is realized by a DSP.
Preferably, the frequency control unit 300 of the binaural beat sound output device with an improved sound field feeling according to the embodiment of the present invention generates the second monaural sound source signal by variably setting the specific frequency band or the predetermined frequency according to a user operation or preset mode information under the control of the integrated control unit 500. That is, the frequency control unit 300 may set a frequency band and a frequency amount to be shifted in consideration of the frequency of the brain wave to be induced according to the control of the integrated control unit 500, and may shift a set frequency band component in the frequency band constituting the first monaural sound source signal by the set frequency amount according to the set frequency band and frequency amount to generate the second monaural sound source signal.
In detail, it is preferable that the integrated control unit 500 sets an intentionally induced brain wave by applying a binaural beat according to a user operation or pattern information (desired brain wave state information) received from the user, and sets a brain wave induction order so as to induce the set brain wave (intentionally induced brain wave).
For this reason, as shown in fig. 1, the binaural beat sound output apparatus with improved sound field sensation according to the embodiment of the present invention preferably further includes a brain wave sensor unit 600 and a heart rate sensor unit 700.
The brain wave sensor unit 600 preferably includes a brain wave sensor for detecting a current brain wave state of the user, and the heart rate sensor unit 700 preferably includes a heart rate sensor for detecting a current heart rate of the user.
The brain wave sensor part 600 may be implemented in a hair band or a band clip manner in contact with the head of the user, or may be included in a headset in another structure.
The heart rate sensor unit 700 may be implemented as a wrist band that can be attached to the wrist of the user, or as a typical electrode that is attached to the chest or neck.
Preferably, using this, the integrated control unit 500 receives the current brain wave state of the user detected by the brain wave sensor unit 600, and determines a brain wave induction order for sequentially inducing the user to the set "brain waves" according to the user's operation or pattern information received from the user.
In detail, it is preferable that the integrated control unit 500 receives the transmission of the current brain wave state of the user detected by the brain wave sensor unit 600, and controls the frequency control unit 300 so that the brain wave induction order from the current brain wave state of the user to the "target brain wave" induction set according to the user operation or the pattern information received from the user is sequentially induced from a state of high brain wave frequency to a state of low brain wave frequency or from a state of low brain wave frequency to a state of high brain wave frequency.
The brain wave induction sequence is a brain wave induction sequence for inducing a target brain wave desired by the user from the current brain wave state of the user detected by the brain wave sensor unit 600, and preferably, the frequency control unit 300 is controlled so that the frequency of the brain wave is induced in a sequence of increasing (wave- θ wave- α wave- β wave) or decreasing (β wave- α wave- θ wave).
Therefore, the brain wave state can be naturally transited from the current brain wave state to the target brain wave state.
As an example, as shown in fig. 3, when the current brain wave state of the user is a β -wave and the target brain wave state desired by the user is a wave, the integrated control unit 500 controls the frequency control unit 300 such that the wave state is induced after the β -wave- α -wave- θ wave, instead of controlling the frequency transition such that the wave state is directly induced by the frequency control unit 300.
In contrast, when the current brain wave state of the user is a θ wave and the target brain wave state desired by the user is a β wave, the integrated control unit 500 preferably controls the frequency control unit 300 to perform frequency transition so that the β wave state is induced after the θ wave- α wave.
Further, it is preferable that the integrated control unit 500 variably controls the playback speed of the first stereo output signal and the playback speed of the second stereo output signal in response to the transmission of the current heart rate of the user detected by the heart rate sensor unit 700. That is, it is preferable to help the brain wave state of the user to be induced toward the wave state by playing audio slowly in a case where the user is stable and the current heart beat frequency becomes slow.
The first stereo output signal and the second stereo output signal will be described later.
In this way, it is preferable that the frequency control unit 300 generates the second monaural sound source signal by variably setting the specific frequency band or the predetermined frequency according to the control of the integrated control unit 500.
In detail, the human hearing is known to have a resolution limit of 0.3% of the frequency change in the range of 500 to 6000 Hz. That is, the human hearing ability in the frequency range of 500 to 6000Hz can distinguish the frequency change of 1.5 to 18Hz, and when the frequency is shifted by 0.3% or more in the frequency range of 500 to 6000Hz, the change of the sound quality can be recognized.
Therefore, in the binaural beat sound output device with improved sound field sensation according to the embodiment of the present invention, the lower limit of the frequency band to be shifted is preferably set to a value within 0.3% so that the user cannot recognize the sound quality change of the sound source due to the frequency shift.
As an example, the frequency bands and frequency quantities that are intended to be migrated are associated with the frequencies of the brainwaves that are intended to be induced. In the case where it is intended to induce an α wave, since the α wave has a frequency range of 8 to 14Hz as described above, the frequency band in which the frequency amount of the binaural beat transition is preferably in the range of 8 to 14Hz is used, and the lower limit value of the frequency band to be transitioned is preferably set to 8 to 14/0.3%, that is, a value in the range of 2667 to 4667 Hz.
Table 1 below relates to target brain waves intended to be induced by a user using a binaural beat sound output device with improved sound field sensation according to an embodiment of the present invention, and a preferred transition frequency amount and a lower limit of a transition frequency band corresponding thereto.
[ TABLE 1 ]
In this way, the integrated control unit 500 preferably sets a frequency band to be shifted and a frequency amount to be shifted in frequency components constituting the first monaural sound source signal with reference to the values described in table 1 in order to generate a sound source signal for being induced into a specific brain wave (target brain wave state) which is intended to be induced (set by a user operation or mode information (desired brain wave state information) received from the user.
The frequency control unit 300 shifts the frequency of the first monaural sound source signal to generate the second monaural sound source signal according to the setting of the integrated control unit 500.
In this case, as described above, the binaural beat sound output device according to the embodiment of the present invention, which improves the sound field sensation, can improve the beat phenomenon and the sound quality degradation by transmitting the stereo sound source, instead of providing the monaural sound source.
For this purpose, it is preferable that the output audio generating unit 400 removes the specific frequency band from the first and second stereo sound source signals, and mixes only the corresponding portions into the first monaural sound source signal before the transition and the second monaural sound source signal after the transition, respectively.
In detail, it is preferable that the output audio generating unit 400 generates a first stereo output signal by removing the specific band of the first stereo sound source signal and adding the specific band of the first mono sound source signal, and generates a second stereo output signal by removing the specific band of the second stereo sound source signal and adding the specific band of the second mono sound source signal.
As described above, the first stereo output signal and the second stereo output signal generated by the output audio generating unit 400 can induce a desired brain wave state without generating distortion and sound quality degradation of a sound source and without generating a tactile sensation and a monotonous sensation while maintaining an original state of a received stereo sound source and applying a binaural beat of a monophonic sound source only to a specific frequency band of a sound source signal.
Fig. 2 is a diagram of frequency band spectra before and after transition by a binaural beat sound output apparatus with improved sound field feeling according to an embodiment of the present invention.
Specifically, when the brain wave to be induced is an α wave set to be intentionally induced according to the operation of the user or the mode information (desired brain wave state information) received from the user, the integrated control unit 500 sets the frequency amount to be shifted to 10Hz and sets the frequency band to be shifted to 500 to 2000Hz in order to induce the brain wave of the user to the α wave, and the frequency control unit 300 shifts the frequency band between 500 to 2000Hz of the first monaural sound source signal to 10Hz and shifts the frequency band to 510 to 2010Hz, thereby generating the second monaural sound source signal.
Here, the frequency band to be shifted is set to 500 to 2000Hz, but this is only one embodiment of the present invention, and referring to table 1 described above, when the frequency amount to be shifted is set to 10Hz in order to induce α -waves, the lower limit of the frequency band to be shifted is set to 3333Hz, and frequency shifting can be performed for a frequency band equal to or higher than the lower limit.
In this case, one of the first and second stereo sound source signals selected by the output audio generating unit 400 is mixed as the first mono sound source signal into the set frequency band, and the other of the first and second stereo sound source signals is mixed as the second mono sound source signal into the set frequency band, so that the user can be provided with a stereo sound source and the desired brain wave can be smoothly induced.
Preferably, the binaural beat sound output apparatus with improved sound field feeling according to an embodiment of the present invention further includes a sound output unit 800.
The audio output unit 800 may convert the first stereo output signal and the second stereo output signal into audio and output the audio.
In detail, it is preferable that a sound corresponding to the first stereo output signal is output from one side of the sound output unit 800, and a sound corresponding to the second stereo output signal is output from the other side of the sound output unit 800, and the sound output unit 800 may be implemented by an audio amplifier for driving a headphone or an ear plug connected thereto.
Also, preferably, as shown in fig. 1, the binaural beat sound output apparatus with improved sound field feeling according to the embodiment of the present invention further includes a user unit.
Preferably, the user unit receives an input of an operation command (direct input of a desired electroencephalogram state or mode input of an electroencephalogram state) from the user, and displays a current electroencephalogram state, a target electroencephalogram intended to be induced according to the electroencephalogram state and the operation command, and a currently performed electroencephalogram induction order.
Fig. 4 and 5 are sequence diagrams showing a binaural beat sound output method with improved sound field sensation according to an embodiment of the present invention, and the binaural beat sound output method with improved sound field sensation according to the embodiment of the present invention will be described in detail with reference to fig. 4 and 5.
Preferably, as shown in fig. 4, the binaural-beat sound output method with improved sound field feeling according to an embodiment of the present invention includes a sound source input step, a monaural generation step, a frequency band analysis step, a frequency shift step, and an output audio generation step, and the frequency shift step is preferably controlled by a control step.
Each step is explained in detail.
In the sound source input step, the sound source input unit 100 may receive input of the sound source data composed of the first and second stereo sound source signals, which are stored in advance or input from the outside.
In detail, it is preferable that the sound source input step receives an input of a desired external sound source from a user, or receives an input of sound source data selected by the user from among a plurality of sound source data stored in advance in the sound source storage unit.
In this case, since the plurality of sound source data are generally configured by stereo sound sources, it is preferable that the plurality of sound source data are configured by the first and second stereo sound source signals without performing a separate conversion process.
Further, preferably, when an input of an external sound source is received from a user, the external sound source input as an Analog signal is converted into a digital signal by an Analog-to-digital converter (ADC).
In the monaural sound source generating step, the monaural conversion unit 200 may receive the transmission of the sound source data and convert the sound source data to generate the first monaural sound source signal.
In detail, it is preferable that the monaural sound source generating step extracts a monaural sound source from the sound source data including a stereo sound source to generate the first monaural sound source signal.
In this case, a sound source component on one side may be selected from a left-side component or a right-side component of an audio component including stereo sound as the monaural sound source, or a single monaural sound source may be extracted by mixing stereo components to be used as the monaural sound source.
In the frequency band analyzing step, 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 of the sound source signal. In this case, the frequency band analysis is to perform fourier transform on each sound source signal to obtain frequency components constituting each sound source signal.
In the frequency shifting step, the frequency control unit 300 may shift a specific frequency band among frequency bands constituting the first monaural sound source signal by a predetermined frequency to generate the second monaural sound source signal.
That is, in the frequency shift step, it is preferable that a specific frequency band is extracted from the frequency bands constituting the first monaural sound source signal, and a predetermined frequency is shifted with respect to the extracted specific frequency band to generate the second monaural sound source signal, and most preferably, the frequency shift is realized by a DSP.
In this case, it is preferable that the specific frequency band or the predetermined frequency is changed in the frequency transition step in accordance with the control of the control step, as described above.
Therefore, in the control step, the specific frequency band or the predetermined frequency may be variably set by the integrated control unit 500 according to a user operation or preset mode information.
In detail, it is preferable that the frequency shift step generates the second monaural sound source signal by variably setting the specific frequency band or the predetermined frequency according to a user operation or mode information set in advance, under control of the control step. That is, in the frequency shift step, the frequency band and the frequency amount to be shifted are set in consideration of the frequency of the brain wave to be induced according to the control of the control step, and the second monaural sound source signal can be generated by shifting the set frequency band component in the frequency band constituting the first monaural sound source signal by the set frequency amount according to the set frequency band and frequency amount.
In the control step, it is preferable that the integrated control unit 500 sets an electroencephalogram to be intentionally induced by applying a binaural beat in accordance with an operation of the user or pattern information (desired electroencephalogram state information) received from the user, and sets an electroencephalogram induction order so that the set electroencephalogram (intentionally induced electroencephalogram) is induced.
For this, as shown in fig. 5, the controlling step may preferably include a user inputting step of setting an brain wave to be induced according to a user operation or pattern information received from a user, and setting the brain wave induction order such that the set brain wave is induced.
In addition, the method may further include an electroencephalogram detection step of detecting the current electroencephalogram state of the user using an electroencephalogram sensor, and a heart rate detection step of detecting the current heart rate state of the user using a heart rate sensor.
Thus, the control step may include an electroencephalogram induction order determination step of receiving transmission of the detected current electroencephalogram state of the user, and determining an electroencephalogram induction order such that electroencephalograms are sequentially induced.
Preferably, in the control step, the transmission of the detected current brain wave state of the user is received, and an order of brain wave induction for sequentially inducing the set "brain waves" is determined based on an operation of the user or pattern information received from the user.
In detail, it is preferable that the control step receives transmission of the detected current brain wave state of the user, and controls the frequency transition step so that the brain wave induction sequence from the current brain wave state of the user to the "target brain wave" induced by the user's operation or the pattern information received from the user is sequentially induced from a state of high brain wave frequency to a state of low brain wave frequency or from a state of low brain wave frequency to a state of high brain wave frequency.
Preferably, in the control step, the frequency transition step is controlled such that the brain wave induction order from the current brain wave state of the user to the "target brain wave" induction set according to the operation of the user or the pattern information received from the user is sequentially induced from a state in which the frequency of the brain wave is high to a state in which the frequency of the brain wave is low to a state in which the frequency of the brain wave is high.
In this case, the brain wave induction procedure is a brain wave induction procedure for inducing a brain wave from the current brain wave state of the user detected in the brain wave detection procedure to a target brain wave desired by the user, and it is preferable that the frequency shift procedure is controlled so that the frequency of the brain wave is induced in an order of increasing (wave- θ wave- α wave- β wave) or decreasing (β wave- α wave- θ wave).
Therefore, the brain wave state can be naturally transited from the current brain wave state to the target brain wave state.
As an example, as shown in fig. 3, when the current brain wave state of the user is a β wave and the target brain wave state desired by the user is a wave, the frequency transition step is controlled so that the wave state is induced after the β wave- α wave- θ wave, instead of controlling the frequency transition step and controlling the frequency transition so that the wave state is directly induced.
In contrast, in the case where the current brain wave state of the user is a θ wave and the target brain wave state desired by the user is a β wave, the frequency shift step is preferably controlled in the control step so that the β wave state is induced after the θ wave- α wave.
Further, as shown in fig. 5, it is preferable that the controlling step further includes a tempo changing step of receiving transmission of the detected current heart rate of the user and variably controlling playback tempos of the first stereo output signal and the second stereo output signal. That is, it is preferable to help the brain wave state of the user to be induced toward the wave state by playing audio slowly in a case where the user is stable and the current heart beat frequency becomes slow.
In this way, it is preferable that the control step generates the second monaural sound source signal by variably setting the specific frequency band or the predetermined frequency in the frequency transition step.
In detail, the human hearing is known to have a resolution limit of 0.3% of the frequency change in the range of 500 to 6000 Hz. That is, the human hearing ability in the frequency range of 500 to 6000Hz can distinguish the frequency change of 1.5 to 18Hz, and when the frequency is shifted by 0.3% or more in the frequency range of 500 to 6000Hz, the change of the sound quality can be recognized.
Therefore, in the binaural beat sound output method with improved sound field sensation according to the embodiment of the present invention, the lower limit of the frequency band to be shifted is preferably set to a value within 0.3%, so that the user cannot recognize the sound quality change of the sound source due to the frequency shift.
As an example, the frequency bands and frequency quantities that are intended to be migrated are associated with the frequencies of the brainwaves that are intended to be induced. In the case where it is intended to induce an α wave, since the α wave has a frequency range of 8 to 14Hz as described above, the frequency band in which the frequency amount of the binaural beat transition is preferably in the range of 8 to 14Hz is used, and the lower limit value of the frequency band to be transitioned is preferably set to 8 to 14/0.3%, that is, a value in the range of 2667 to 4667 Hz.
Accordingly, in the control step, it is preferable that a frequency band to be shifted and a frequency amount to be shifted among frequency components constituting the first monaural sound source signal are set with reference to values described in table 1 in order to generate a sound source signal for being induced into a specific brain wave (target brain wave state) which is intentionally induced (set by a user operation or mode information (desired brain wave state information) received from the user.
In the frequency shifting step, the first monaural sound source signal is frequency-shifted in accordance with the control setting in the control step to generate the second monaural sound source signal.
In addition, in the binaural beat sound output method with improved sound field sensation according to an embodiment of the present invention, instead of providing a mono sound source, the beat vibration phenomenon and the sound quality reduction can be improved by transmitting a stereo sound source to improve the sound field sensation.
For this reason, it is preferable that the output audio generating step removes the specific frequency band from the first and second stereo sound source signals, and mixes only the corresponding portions into the first monaural sound source signal before the transition and the second monaural sound source signal after the transition, respectively.
In detail, in the output audio generating step, it is preferable that the output audio generating unit 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 removes the specific frequency band of the second stereo sound source signal and adds the specific frequency band of the second mono sound source signal to generate a second stereo output signal.
As described above, the first stereo output signal and the second stereo output signal are generated so that the original state of the received stereo sound source is maintained and the binaural beat of the monaural sound source is applied only to the specific frequency band of the sound source signal, thereby inducing the desired brain wave state without causing distortion and deterioration in sound quality of the sound source and without causing a tactile sensation or a monotonous sensation.
Fig. 2 is a diagram of frequency band spectra before and after transition by a binaural beat sound output apparatus with improved sound field feeling according to an embodiment of the present invention.
In the control step, when the brain wave to be transferred is set to 10Hz and the frequency band to be transferred is set to 500 to 2000Hz in order to induce the brain wave of the user to the α wave when the brain wave to be induced is the α wave set according to the operation of the user or the mode information (desired brain wave state information) received from the user, the frequency control step shifts the frequency band between 500 to 2000Hz of the first monaural sound source signal by 10Hz and moves the frequency band to 510 to 2010Hz, thereby generating the second monaural sound source signal.
Here, the frequency band to be shifted is set to 500 to 2000Hz, but this is only one embodiment of the present invention, and referring to table 1 described above, when the frequency amount to be shifted is set to 10Hz in order to induce α -waves, the lower limit of the frequency band to be shifted is set to 3333Hz, and frequency shifting can be performed for a frequency band equal to or higher than the lower limit.
In this case, one of the first and second stereo sound source signals selected by the output audio generating step is mixed as the first mono sound source signal into the set frequency band, and the other of the first and second stereo sound source signals is mixed as the second mono sound source signal into the set frequency band, so that the stereo sound source can be provided to the user and the desired brain wave can be smoothly induced.
The first stereo output signal and the second stereo output signal generated in the output audio generating step may be converted into sound by the sound output unit 800 and output.
In detail, it is preferable that a sound corresponding to the first stereo output signal is output from one side of the sound output unit 800, and a sound corresponding to the second stereo output signal is output from the other side of the sound output unit 800, and the sound output unit 800 may be implemented by an audio amplifier for driving a headphone or an ear plug connected thereto.
In addition, the binaural beat sound output method with improved sound field sensation according to the embodiment of the present invention can transmit the progress state (progress status) of each step to the user unit or receive the transmission of the input information of the user.
Preferably, the user unit receives an input of an operation command (direct input of a desired electroencephalogram state or mode input of an electroencephalogram state) from the user, and displays a current electroencephalogram state, a target electroencephalogram intended to be induced according to the electroencephalogram state and the operation command, and a currently performed electroencephalogram induction order.
That is, in other words, according to the binaural beat sound output device and the method thereof with improved sound field sensation of the embodiment of the present invention, it is possible to induce a desired brain wave state without generating distortion and sound quality degradation of a sound source and without generating a tactile sensation and a monotonous sensation while maintaining an original state of a received stereo sound source and applying the binaural beat of a monaural sound source only to a specific frequency band of a sound source signal.
As described above, the present invention has been described with reference to specific matters such as specific constituent elements, specific embodiments and drawings, but this is provided only to facilitate a more complete understanding of the present invention, and the present invention is not limited to the above-described embodiments, and various modifications and variations can be made by those skilled in the art in light of the description.
Therefore, the idea of the present invention is not limited to the described embodiments, and the scope of the claims to be described later and all variations equivalent or equivalent to the scope of the claims are included in the scope of the idea of the present invention.
[ description of reference numerals ]
100: sound source input unit
200: monaural conversion section
300: frequency control unit
400: output audio generation unit
500: integrated control part
600: brain wave sensor unit
700: heart rate sensor unit
800: sound output unit
Claims (12)
1. A binaural beat sound output apparatus with an improved sound field feeling, comprising:
a sound source input unit (100) that receives input of sound source data that is composed of a first stereo sound source signal and a second stereo sound source signal;
a monaural conversion unit (200) that receives the sound source data and converts the sound source data to generate a first monaural sound source signal;
a frequency control unit (300) that receives the first stereo sound source signal, the second stereo sound source signal, and the first mono sound source signal, analyzes the frequency bands constituting the sound source signals, and shifts a specific frequency band among the frequency bands constituting the first mono sound source signal by a predetermined frequency to generate a second mono sound source signal; and
an output audio generation unit (400) which generates a first stereo output signal by removing the specific frequency band of the first stereo sound source signal and adding the specific frequency band of the first mono sound source signal, and generates a 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.
2. The binaural beat sound output apparatus with improved sound field feeling according to claim 1,
further, the radio communication apparatus includes an integrated control unit (500), and the integrated control unit (500) changes the specific frequency band or the predetermined frequency according to a user operation or set mode information.
3. The binaural beat sound output apparatus with improved sound field feeling according to claim 2,
the specific frequency band is selected from the frequency bands of 500-6000 Hz,
the predetermined frequency is a frequency in any one of frequency ranges of an α wave, a β wave, a θ wave, and a frequency range of a wave, which is an electroencephalogram to be induced.
4. The binaural beat sound output apparatus with improved sound field feeling according to claim 3,
the integrated control unit (500) sets an electroencephalogram to be intentionally induced, based on a user operation or pattern information received from the user, and sets an electroencephalogram induction sequence to induce the set electroencephalogram.
5. The binaural beat sound output apparatus with improved sound field feeling according to claim 4,
further comprising:
a brain wave sensor unit (600) including a brain wave sensor for detecting a current brain wave state of a user; and
a heart rate sensor unit (700) including a heart rate sensor for detecting the current heart rate of the user,
the integrated control unit (500) receives the current brain wave state of the user detected by the brain wave sensor unit (600), determines a brain wave induction sequence to sequentially induce brain waves, and receives the current heart rate of the user detected by the heart rate sensor unit (700) to change the playback speed of the first stereo output signal and the second stereo output signal.
6. The binaural beat sound output apparatus with improved sound field feeling according to claim 5,
the integrated control unit (500) receives the current brain wave state of the user detected by the brain wave sensor unit (600), and controls the frequency control unit (300) such that the brain wave induction sequence from the current brain wave state of the user to the brain wave intended to be induced is sequentially induced from a state in which the frequency of the brain wave is high to a state in which the frequency of the brain wave is low, or from a state in which the frequency of the brain wave is low to a state in which the frequency of the brain wave is high.
7. The binaural beat sound output apparatus with improved sound field feeling according to claim 1,
further comprising an acoustic output unit (800), wherein the acoustic output unit (800) converts the first stereo output signal and the second stereo output signal into sound and outputs the sound,
sound corresponding to the first stereo output signal is output from one side of the sound output unit (800), and sound corresponding to the second stereo output signal is output from the other side of the sound output unit (800).
8. A binaural beat sound output method with improved sound field sensation, comprising:
a sound source input step in which a sound source input section accepts input of sound source data composed of a first stereo sound source signal and a second stereo sound source signal, which are stored or input from the outside;
a monaural sound source generating step in which a monaural converting section receives the sound source data and converts the sound source data to generate a first monaural sound source signal;
a frequency band analyzing step, wherein the frequency control part receives the first stereo sound source signal, the second stereo sound source signal and the first single sound channel sound source signal and analyzes the frequency band forming the sound source signal;
a frequency shifting step in which a frequency control unit shifts a specific frequency band among frequency bands constituting the first monaural sound source signal by a predetermined frequency to generate a second monaural sound source signal; and
an output audio generating step of generating a first stereo output signal by removing the specific frequency band of the first stereo sound source signal and adding the specific frequency band of the first mono sound source signal, generating a 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 method further includes a control step in which the integrated control unit changes the specific frequency band or the predetermined frequency according to a user operation or set mode information.
9. The binaural beat sound output method with improved sound field sensation according to claim 8,
the specific frequency band is selected from the frequency bands of 500-6000 Hz,
the predetermined frequency is a frequency in any one of frequency ranges of an α wave, a β wave, a θ wave, and a frequency range of a wave, which is an electroencephalogram to be induced.
10. The binaural beat sound output method with improved sound field sensation according to claim 9,
the controlling step may include a user input step,
in the user input step, an intention-to-induce brain wave is set according to an operation of a user or pattern information received from the user, and a brain wave induction order is set to induce the set brain wave.
11. The binaural beat sound output method with improved sound field sensation according to claim 10,
also includes;
a brain wave detection step, in which the integrated control part detects the current brain wave state of the user by using a brain wave sensor; and
a heart rate detection step in which the integrated control unit detects the current heart rate of the user by using a heart rate sensor,
the control steps include:
a brain wave induction sequence determination step of receiving the detected current brain wave state of the user and determining a brain wave induction sequence to sequentially induce brain waves; and
a speed changing step of receiving the detected current heart rate of the user and changing the playing speed of the first stereo output signal and the second stereo output signal.
12. The binaural beat sound output method with improved sound field sensation according to claim 11,
the control step receives the detected current brain wave state of the user, and controls the frequency transition step so that the brain wave induction sequence from the current brain wave state of the user to the brain wave to be induced is induced in order from a state of high brain wave frequency to a state of low brain wave frequency or from a state of low brain wave frequency to a state of high brain wave frequency.
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