JPH10244004A - Audible sound for inducing fmtheta and generating method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the desirable condition of mind and body affected by Fmθ and αwave, that is, the power of attention and concentration, and further quicken the progress of relaxation and rest of mind and body by letting a person hear an audible sound including a modulated wave formed by superposing ultra low frequency below a designated hertz on low frequency in the audible region. SOLUTION: When a change-over switch S is put in a contact (b) position to start a circuit, the outputs of first and second oscillation circuits O1, O2 are fed to a modulation circuit M. Both outputs are mixed hear to be amplituded and modulated, and a modulation wave is led out at the output end of the modulation circuit M. In this modulated wave, a sine wave with a frequency of about 2 to 10 hertz is superposed on a sine wave with a frequency of about 150 hertz. The output of the modulation circuit M is amplified by amplifiers A1, A2 to energize a pair of speaker units in a headphone P. When an object person operates with the headphone P put on the head, an audible sound including a modulated wave in which a since wave with a frequency of about 2 to 10 hertz is superposed on a sine wave with a frequency of about 150 hertz can be heard by his ears.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audible sound for inducing Fm.theta. In human brain waves and a method for generating the audible sound.

[0002]

2. Description of the Related Art The potential difference observed between two different points on the cerebral cortex and scalp is called "brain wave" and has a unique waveform and rhythm corresponding to the state of mind and body. Brain waves are generally classified into four waves, an α wave, a β wave, a θ wave, and a δ wave, depending on the period of the rhythm. Among them, α waves having a period of 8 to 13 Hz are strong and appear continuously over a wide area as the body and mind relax. On the other hand, β waves having a period of 18 to 30 Hertz, on the contrary, become stronger and appear more widely as the body and the body become nervous. The θ wave having a period of 4 to 8 Hz and the δ wave having a period of less than 4 Hz are brain waves related to sleep onset. It is said that the θ wave appears strongly when falling asleep, and the δ wave becomes dominant as the sleep becomes deeper. As shown in Inoue et al., "The EEG of Mental Activities," pp. 136-148 (1988).
Among waves, the predominant θ rhythm at 6 to 7 Hz observed near the median frontal region of adults is called “Fmθ” and is said to be deeply involved in mental work. Analyzing the brain waves of a person performing mental work, F
mθ is observed, and its intensity and distribution are
The more attention and concentration of the worker, the stronger,
It will appear widely.

[0003] As described above, since Fmθ has a close relationship with attention and concentration, if Fmθ can be artificially induced by any method, the attention and concentration of the worker can be improved. It is expected that work efficiency and accuracy can be improved. However, no device or method capable of artificially inducing Fmθ has been known so far.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide an audible sound that can induce Fmθ artificially by allowing a human to listen.

Another object of the present invention is to provide a method for artificially generating such an audible sound.

[0006]

Means for Solving the Problems The present inventor has conducted intensive studies on means capable of solving the above-mentioned problems. Hearing sounds were found to induce the appearance of Fmθ more strongly and in a wider range when humans listen. The present invention is based on such a novel finding, and has as its gist an audible sound for inducing Fmθ including a modulated wave obtained by superimposing a super-low frequency having a frequency of about 20 Hz or less on a low frequency in an audible range. Things.

The present inventor has also studied a method of artificially generating such an audible sound.
By amplitude-modulating the low frequency in the audible range at a very low frequency of about 20 Hertz or less, and performing an electroacoustic conversion of an electric signal including a modulated wave obtained by superimposing the very low frequency on the obtained low frequency,
It turned out to be relatively easy to obtain. That is, according to the present invention, the low frequency in the audible range is amplitude-modulated at a very low frequency of about 20 Hz or less, and an electric signal including a modulated wave obtained by superimposing the very low frequency on the obtained low frequency is subjected to electroacoustic conversion. The gist of the invention is a method of generating an audible sound for inducing Fmθ.

[0008]

The audible sound of the present invention, when heard by a human, promotes the appearance of Fmθ in the brain waves. In particular, when the very low frequency is in the range of about 2 to 10 Hertz,
It encourages not only Fmθ but also the appearance of α waves.

A method for generating an audible sound according to the present invention is for artificially generating such an audible sound. When the amplitude of a low frequency in an audible range is modulated by an ultra-low frequency having a frequency of about 20 Hz or less, the former method is used. An electric signal including a modulated wave obtained by superimposing the latter ultra-low frequency on the low frequency is obtained. The electric signal is subjected to electroacoustic conversion to give an audible sound including the modulated wave.

Hereinafter, the present invention will be described in detail with reference to examples and experimental examples. A modulated wave according to the present invention is obtained by superposing an ultra-low frequency having a frequency of about 20 Hz or less on a low frequency in an audible range. It is. As such a low frequency, a continuous wave or a pulse wave having an appropriate waveform having a frequency exceeding an extremely low frequency and not exceeding about 20,000 hertz is usually used. The present inventor has conducted various tests on healthy subjects. As a result, when the frequency of the low frequency exceeds about 6,000 Hz, some subjects may complain of difficulty in hearing or slight discomfort.
Actually, when considering the frequency of the ultra-low frequency and the frequency characteristics of the reproducing apparatus, usually, about 50 to 3,000 Hz,
Preferably, it is set to about 100 to 500 Hertz, and more preferably, to about 120 to 200 Hertz.
Various tests were also performed on the waveform, and a continuous wave such as a sine wave, or a pulse wave such as a sawtooth wave, a square wave, a triangular wave, or a rectangular wave, for example, having a relatively long pulse duration is preferable. there were. On the other hand, for very low frequencies, a frequency of about 20
Usually, a continuous wave or a pulse wave of about 2 to 10 Hz or less is desirable, and a continuous wave such as a sine wave or a pulse wave having a relatively long duration is preferable as in the case of a low frequency. It is suitable.

In order to generate such a modulated wave, an electric circuit called a modulated wave generating circuit is generally used. The modulated wave generating circuit includes, for example, a first oscillation circuit for generating an audible low frequency and a first oscillating circuit. A second oscillating circuit for generating an ultra-low frequency having a frequency of about 20 Hertz or less, and an input terminal connected to an output terminal of the oscillating circuit for modulating the former low frequency with the latter ultra-low frequency. It includes a modulation circuit such as a modulation circuit, a phase modulation circuit, a frequency modulation circuit, or a pulse modulation circuit. Normally, the low frequency generated by the first oscillation circuit is amplitude-modulated in the modulation circuit by the very low frequency generated by the second oscillation circuit, and the latter low frequency is superimposed on the former low frequency. An electric signal including a modulated wave is obtained. There is no particular limitation on the circuit configuration and circuit elements in these oscillation circuits and modulation circuits, as long as the modulated wave appearing at the output end of the modulation circuit satisfies the above requirements, but generally, transistors, field effect transistors and / or Or, it is mainly composed of an integrated circuit. When the output of the modulation circuit itself is low, or the output terminal of the modulation circuit and the electro-acoustic transducer do not match in terms of impedance, etc., the electro-acoustic transducer cannot be substantially energized by the modulation circuit alone. Does not prevent insertion of an appropriate amplifier, matching circuit, or the like between the modulation circuit and the electroacoustic transducer.

The modulated wave thus obtained has a waveform in which the very low frequency envelopes the low frequency, and the voltage value of the low frequency periodically fluctuates according to the frequency of the very low frequency. The present inventor focused on Fmθ-inducing ability and side effects, and conducted tests on healthy subjects with various modulation degrees of the modulated wave. The modulation degree was about 30 to 100%, and preferably about 60 to 100%. When it was in the range of 90%, the highest level of Fmθ could be induced without causing side effects such as discomfort. Since the optimum modulation degree of the modulated wave and the optimum frequency of the low frequency and the very low frequency in the modulated wave are usually slightly different depending on the individual subjects, each subject can determine the optimum modulation degree and frequency. It is desirable to provide the modulation wave generating circuit with a function of adjusting the degree of modulation and the frequency within a certain range so that audible sound can be heard.

By the way, in the audible sound according to the present invention, when so-called "1 / f fluctuation" is added, the Fmθ inducing ability is remarkably increased. That is, the frequency, duration,
When the frequency and / or the intensity is varied according to the 1 / f fluctuation rule, the audible sound based on the modulated wave and the 1 / f
It has been found that the fluctuation due to the fluctuation law acts synergistically and promotes the appearance of Fmθ to such an extent that it cannot be easily achieved by only one of them. Above all, EEG, heart rate, blood pressure, breathing,
A sequence with 1 / f fluctuation sampled from long-term fluctuations of biological phenomena including body temperature is extremely useful,
When varying the frequency, duration, frequency and / or intensity of the audible sound based on such a sequence, a very high level of Fmθ can be induced with a small amount of stimulation, and it lasts for a long time after stimulation. . This is because a series with 1 / f fluctuation sampled from long-term fluctuations in human biological phenomena contains a lot of important information on biological control mechanisms represented by the nervous system. It is understood that the perception of Fmθ in addition to the effect of promoting the appearance of Fmθ results in a synergistic increase in the physiological action of the audible sound according to the present invention. In order to impart such a variation to the audible sound, for example, the above-described sequence is stored in a microcomputer, and an electric signal including a pseudo 1 / f fluctuation sequence extracted therefrom is supplied to the oscillation circuit through an interface. Or a modulation circuit.

The electric signal obtained as described above is supplied to an electroacoustic converter, where it is converted into an audible sound containing the modulated wave. The audible sound referred to in the present invention means a sound wave that can be perceived by a human auditory organ. Therefore, the electroacoustic transducer referred to herein is a means for converting the electric signal into a sound wave including the modulated wave. become.
As individual electroacoustic transducers, for example, electrodynamic speakers, electromagnetic transducers such as electromagnetic speakers and electrostatic speakers,
Examples include an electrostatic converter such as a piezoelectric speaker or a combination thereof as appropriate. The operating principle, shape, form, and size of the electro-acoustic transducer are not particularly limited, and any electro-acoustic transducer can be used in the present invention as long as the subject can perceive the modulated wave through his / her hearing. When the device for generating audible sound of the present invention is carried and used, small headphones and earphones are suitable.

A method of supplying a modulated wave generated by a modulated wave generating circuit to an electroacoustic converter is generally classified into two types. One of the methods is a modulated wave generating circuit and an electroacoustic converter. This is a wired system in which devices are directly connected by a cable or the like. In this method, the subject or his / her assistant usually operates electrical components including the modulated wave generating circuit at the place where the subject actually listens. In another method, an electrical component including a modulated wave generating circuit and an electrical component including an electroacoustic transducer are separately configured, and the output of the modulated wave generating circuit is transmitted by wireless communication or optical communication. This is a wireless system for supplying electrical components. In wireless systems, usually
The assistant operates the former electrical component at a place slightly away from the place where the subject actually listens. Fmθ
Although there is no substantial difference in either method, the latter method facilitates simultaneous audible stimulation of a plurality of subjects, and furthermore, the wireless method There is an advantage that the subject can move freely within the reach.

The electric signal containing the modulated wave obtained as described above can be recorded on a magnetic or optical recording medium in a reproducible manner. When such a recording medium is appropriately reproduced by a reproducing apparatus, an electric signal including an original modulated wave is given. When the electric signal is subjected to electroacoustic conversion in the same manner as described above, it becomes an audible sound according to the present invention. The audible sound generating method according to the present invention naturally includes such an aspect. The recording medium referred to here generally means a magnetic recording medium such as a magnetic tape, a magnetic disk, and a magnetic floppy, and an optical recording medium such as an optical disk. What is necessary is just to employ | adopt the method according to a recording body. When the recording medium is, for example, a compact cassette type magnetic tape, the magnetic tape may be run in a state of being in contact with the magnetic head, and an electric signal containing a modulated wave may be applied to the magnetic head. When the recording medium is, for example, a compact disk, an electric signal including a modulated wave is temporarily converted into a digital signal, and a master disc on which the digital signal is optically readable is created. Then, if a disc material such as polycarbonate is pressed based on the master disc, a compact disc having tracks on which modulated waves are optically recorded can be obtained. When the recording medium is a recording medium capable of recording an image such as a video tape or a video disk, an image capable of inducing Fmθ and / or α wave may be recorded in addition to the modulated wave according to the present invention.

Since the audible sound according to the present invention has substantially no difference in Fmθ induced by one ear or both ears, the recording method may be a monaural method or a stereo method. There may be. However, in the case of the stereo system, for example, while a modulated wave can be recorded on the first track, an unmodulated low frequency can be recorded on the second track. If only the first track recorded is listened, and if necessary, both tracks can be listened to in stereo, the subject can switch between modulated waves and unmodulated low frequencies as appropriate. it can. Depending on the subject, if the audible sound is heard for a long period of time, a feeling of fatigue or familiarity with the audible sound may occur, and when performing the above, such feeling of fatigue and familiarity may be minimized. can do.

When the recording medium thus obtained is reproduced by a reproducing apparatus as appropriate, it gives an electric signal containing a modulated wave. There is no particular limitation on the playback device itself as long as such an electric signal can be obtained, and usually a business or consumer audio / video device is used.

Next, the method of administering audible sound according to the present invention will be described. In general, the audible sound according to the present invention is slightly strong at first, and it is better to gradually reduce it, although it depends on the purpose of use. When the purpose of use is to improve attention and concentration during mental work, if necessary,
The user may listen to the music for an appropriate time before or during the work. When the purpose is to prevent or treat a disease or the like, carefully observe the condition of the subject, for example, once to three times a day, and for a maximum of two hours each time, 1 to 7 days a week, Months to 1
You can listen over the years. Depending on the purpose of use and the subject, the sound pressure of the audible sound at that time is usually about 20 to 90.
dB, preferably about 30 to 80 dB. As described above, the audible sound according to the present invention has substantially no difference in the intensity and distribution of the induced Fmθ whether it is heard with one ear or with both ears. Although it depends on the subject, the audible sound according to the present invention has a property of provoking the appearance of Fmθ when listening for a long time and then listening for a very short time or even without listening at all. For such a subject, the audible sound of the present invention is also useful as so-called "mental training" means. Note that the audible sound of the present invention may include, for example, appropriate sound such as music in addition to the modulated wave as long as the appearance of Fmθ in the subject is not substantially prevented.

The following are a few reference examples of an Fmθ guidance apparatus and an Fmθ guidance recording medium to which the audible sound generation method according to the present invention is applied.

[0021]

Reference Example 1 <Fmθ Guidance Device> FIG. 1 is a block diagram of electrical components of an Fmθ guidance device for generating an audible sound according to the present invention. In the figure, O1 and O2
Denotes a first oscillation circuit or a second oscillation circuit, respectively, and usually an operational amplifier is used. First oscillation circuit O1
Generates a sine wave having a frequency of about 150 Hz, and the second oscillator circuit O2 generates a sine wave having a sine wave waveform at a frequency of about 2 to 10 Hz.
Generates very low frequencies in Hertz. The second oscillation circuit O2 is provided with a variable resistor V1, which can be operated to change the very low frequency in the range of about 2 to 10 Hz. M is a modulation circuit, the input terminal of which is connected to the output terminals of a first oscillation circuit O1 and a second oscillation circuit O2. The low frequency and the very low frequency are amplitude-modulated here, and the output At the end, a modulated wave obtained by superimposing a very low frequency on a low frequency is derived. The variable resistor V2 provided in the modulation circuit M is for adjusting the depth of the amplitude modulation, and by operating this, the modulation degree can be changed in the range of about 30 to 100%. An output terminal of the first oscillation circuit O1 is connected to an amplification circuit A1 via a changeover switch S.
And the output terminal of the modulation circuit M is connected to the input terminal of the second amplification circuit A2 and the contact b of the changeover switch S. Headphones P as electroacoustic transducers are connected to output terminals of the first and second amplifier circuits A1 and A2 via connectors C which can be freely connected and disconnected. Variable resistors V provided at the input terminals of a pair of amplifiers A1 and A2, respectively.
Numeral 3 is for adjusting the magnitude of the audible sound radiated from the left and right speaker units in the headphones P by changing the magnitude of the electric signal applied to the amplifiers A1 and A2. The variable resistor V4 provided between the input terminals of the pair of amplifiers A1 and A2 radiates from the left and right speaker units in the headphones P by adjusting the magnitude of the electric signal applied to the amplifiers A1 and A2. This is to balance the audible sound that is made.

To explain the operation of this embodiment, when the circuit is started with the changeover switch S at the position of the contact b, the outputs of the first and second oscillation circuits O1 and O2 are supplied to the modulation circuit M. You. The two outputs are mixed and amplitude-modulated here, and a modulated wave having a waveform as shown in FIG. As shown in FIG. 2, a sine wave having a frequency of about 2 to 10 Hertz is superimposed on a sine wave having a frequency of about 150 Hertz in this modulated wave. The output of the modulation circuit M is amplified by amplifiers A1 and A2,
Is energized. When the changeover switch S is connected to the contact a, the modulated wave is supplied only to the amplifier A2, and the amplifier A1 is supplied with a low frequency of about 150 Hz generated by the first oscillation circuit O1. In this case, an audible sound including a modulated wave is emitted from one speaker unit of the headphones P, and an audible sound including an unmodulated sine wave is emitted from the other speaker unit.

Since the present embodiment is configured as described above, when the subject is operated with the headphones P mounted on his / her head, a sine wave having a frequency of about 150 Hz is applied to the ears of the subject,
An audible sound including a modulated wave in which a sine wave having a frequency of about 2 to 10 Hz is superimposed on the sine wave can be heard.

[0024]

REFERENCE EXAMPLE 2 <Fmθ Guiding Device> FIG. 3 is a block diagram showing the electrical components of the Fmθ guiding device for supplying the output of the modulated wave generation circuit to the electroacoustic transducer by a wireless method. Symbols O1, O2, M, V1 in the figure
V4, P, and C are for referencing exactly the same circuits and circuit elements as in the case of the reference example shown in FIG. 1, and their use purposes and functions are substantially the same.

As shown in FIG. 3, this embodiment comprises a transmission system and a reception system. In the transmission system, the first oscillation circuit O
The modulated wave or sine wave generated by the first and second oscillation circuits O2 and M is supplied to the input terminal of the stereo frequency modulation circuit FSM via the changeover switch S as in the previous embodiment. The frequency modulation circuit FSM generally has a low-frequency amplification circuit for amplifying a modulated wave or a sine wave applied to the input terminal, and an input terminal connected to an output terminal of the low-frequency amplification circuit. It is composed of a frequency modulation circuit for converting a modulated wave or a sine wave into a high frequency that is frequency-modulated based on the sine wave. A high frequency power amplifier circuit RF for appropriately amplifying the high frequency is provided at an output terminal of the frequency modulation circuit FSM.
The input terminal of P is connected, and the antenna ANT1 for radiating high frequency is connected to the output terminal of the high frequency power amplifier circuit RFP. The receiving system includes an antenna ANT2 for receiving a high frequency, a stereo-type receiving circuit FSR for demodulating a high-frequency voltage from the antenna ANT2 to an electric signal including an original modulated wave or a sine wave, and an output of the receiving circuit FSR. To an audible sound.

The operation of the present embodiment will be described. Since the present embodiment is configured as described above, when the receiving system is started while the transmitting system is operated, the pair of speaker units in the headphone P outputs a frequency of about 150 Hz. Or an audible sound including a modulated wave obtained by superimposing a sine wave having a frequency of about 2 to 10 Hz on the sine wave.

In this embodiment, one or a plurality of receiving systems are prepared for one transmitting system, and these receiving systems are carried by individual subjects, and their headphones P are held on their heads. If the receiving system is operated in the mounted state, the audible sound of the present invention can be heard. This example is suitable for a plurality of subjects to hear audible sounds simultaneously in a relatively large place.

[0028]

Reference Example 3 <Recording Medium for Fmθ Guidance> This example illustrates a magnetic recording medium which gives an audible sound whose reproduction frequency and duration change according to the 1 / f fluctuation rule when reproduced.

The electric circuit means for generating a modulated wave giving an audible sound will be described with reference to FIG. 4. In the figure, reference numeral 1 denotes a microprocessor, and the microprocessor 1 includes a frequency sequence recording circuit. 2. The duration recording circuit 3 and the clock oscillator 4 are connected to form a microcomputer. Separately, 5 healthy persons (2
Based on a time series of 25 cases with 1 / f fluctuation sampled from Fmθ of 0-year-olds (three males and two females), the frequency was set to 0 to 20 times / minute in 5 steps, and As for the duration, 0 to 60 seconds are equally divided into six stages, and the frequency series storage circuit 2 or the duration storage circuit 3
It is stored in. The microprocessor 1 controls the clock pulse from the clock oscillator 4 while referring to the stored contents of both, and generates a pulse train corresponding to the frequency sequence and the duration sequence. Since the storage capacity of the microprocessor 1 is limited, when the frequency sequence and the duration sequence are referred to a certain number, the original data is restored again. A certain number of pseudo-random signals thus obtained are converted into a 1 / f fluctuation control signal of the modulated wave generation circuit 6 by the interface 5. The modulation wave generation circuit 6 has a frequency of about 1
A first oscillating circuit for generating a sine wave of 50 Hertz, a second oscillating circuit for generating a sine wave of a frequency of about 8 Hertz, and an input terminal connected to an output terminal of the oscillating circuit; And a modulation circuit for amplitude-modulating the sine wave with the latter sine wave. A control signal from the interface 5 is applied to a modulation circuit in the modulation wave generation circuit 6 to control the output. The output terminals of the modulation circuit and the first oscillation circuit in the modulation wave generation circuit 6 are connected to separate input terminals of a stereo type magnetic recording device 7.

In this state, all the circuits and devices are started, and while observing the waveform appearing at the output terminal of the modulation wave generating circuit 6 with an oscilloscope, the modulation degree of the modulation wave is reduced to about 80.
%, And the magnetic tape 8 of the compact cassette type loaded in the magnetic recording device 7 is run at a speed of 4.8 cm / s to generate a sine wave of a frequency of about 150 Hz and a sine wave of about 8 Hz. Modulated waves obtained by superimposing a Hertz sine wave were recorded on separate tracks on the magnetic tape 8. The magnetic tape 8 has a tape width of 3.8.
One millimeter regular product was used.

The recording medium of this embodiment has a track on which a sine wave having a frequency of about 150 Hz is magnetically recorded and a track on which a modulated wave obtained by superimposing a sine wave having a frequency of about 8 Hz on the sine wave is magnetically recorded. When reproduced, an audible sound including the sine wave or the modulated wave was given. Since the recording medium of this example can be normally reproduced by a general reproducing apparatus, and is easy to handle and carry, the operator carries the recording medium with the reproducing apparatus to a place where he or she actually works mentally. An audible sound according to the invention can be heard. The audible sound given by the recording medium of the present example changes its appearance frequency and duration according to the 1 / f fluctuation rule, and has extremely high Fmθ inducing ability.

In this example, only the appearance frequency and duration of the audible sound are changed according to the 1 / f fluctuation rule, but only one of them is changed according to the 1 / f fluctuation rule, and the other is changed. The intensity and / or frequency of the low frequency and / or the very low frequency may be changed according to the 1 / f fluctuation rule within a certain range in addition to the irregular frequency or the appearance frequency and duration. . In this example, human F
Although only specific examples using a sequence sampled from a long-term variation in mθ are specifically mentioned, the present inventor, for example, describes a sequence sampled from a long-term variation in a biological phenomenon such as heart rate, blood pressure, respiration, and body temperature. In the same experiment, almost the same results were obtained, although slightly inferior to the case of Fmθ.

[0033]

[Reference Example 4] <Recording body for Fmθ induction> A first oscillator that generates a sine wave having a frequency of about 150 Hertz, a second oscillator that generates a sine wave having a frequency of about 8 Hertz, and a modulation having a built-in amplifier circuit And a stereo-type magnetic recording device, the output terminal of the first oscillator is connected to one of the input terminals of the modulator and the magnetic recording device, and the output terminal of the second oscillator is connected to the input terminal of the modulator. The output of the modulator was connected to one of the remaining inputs of the magnetic recording device. All these devices were started, and the modulation degree of the modulated wave was adjusted to about 80% while observing the waveform of the modulated wave appearing at the output end of the modulator with an oscilloscope. In this state, the compact cassette type magnetic tape loaded in the magnetic recording apparatus is run at 4.8 cm / s, and a modulated wave is applied to one of the tracks of the magnetic tape and an unmodulated low frequency is applied to the other track. That is, a frequency of about 15
A 0 Hertz sine wave was recorded. In addition, on magnetic tape,
A normal product having a tape width of 3.81 mm was used.

The recording medium of the present embodiment has a frequency of about 1 when reproduced.
An audible sound including a sine wave of 50 Hz and an audible sound including a modulated wave obtained by superimposing a sine wave having a frequency of about 8 Hz on the sine wave as shown in FIG. 2 were provided. Since the recording medium of this example can be normally reproduced by a general reproducing apparatus, and is easy to handle and carry, the operator carries the recording medium with the reproducing apparatus to a place where he or she actually works mentally. An audible sound according to the invention can be heard.

[0035]

Reference Example 5 <Recording Body for Fmθ Guidance> This example illustrates an optical recording body that gives an audible sound according to the present invention when reproduced. In this example, first, a magnetic tape in which a predetermined modulated wave and an unmodulated low frequency are magnetically recorded on separate tracks, respectively, is manufactured.
Next, the magnetic tape was reproduced, and the reproduced output was optically recorded on a commercially available writable optical disk by an optical recording device.

In the same manner as in Reference Example 3, a sine wave having a frequency of about 150 Hz and a sine wave having a frequency of about 8 Hz are superimposed on the sine wave.
Modulated waves having f-fluctuations were generated, and these were recorded on separate tracks on a magnetic tape by a magnetic recording device in a stereo system for 8 minutes. The magnetic tape used was an open reel type having a tape width of 6.25 mm, and the tape traveling speed during recording was 19 cm / cm.
Set to seconds. Next, a sine wave having a frequency of about 150 Hz and the sine wave having a frequency of about 2 Hz, 10 Hz, 4 Hz, 8 Hz, 6 Hz, 8
Each time the frequency changes in this order, five types of modulated waves obtained by superimposing a sine wave of 4, 4, or 10 Hz are used.
Each one minute was generated with a rest period of two seconds, and recorded on the remaining portion of the magnetic tape in the same manner as described above. Note that the modulation degree of any modulated wave is
As in Reference Example 3 and Reference Example 4, it was set to about 80%.
During the rest period of the modulated wave, recording of the unmodulated sine wave in other tracks was also stopped.

The magnetic tape thus obtained was loaded into a magnetic reproducing apparatus, and the output end of the magnetic reproducing apparatus was connected to the input end of a general ordinary simple optical recording apparatus via a mixer. An optical recording device was loaded with a writable 8-cm optical disc "CDM-V8" manufactured and sold by Pioneer Corporation. In this state, both devices were started, and the reproduction output of the magnetic tape was recorded on the optical disc. The sampling frequency and the number of quantization bits at the time of optical recording are 4
4.1 kHz, 16 bits, and a calling subcode is provided on the optical disk for each of the first half and second half modulated waves.

The optical recording medium thus obtained is composed of a track on which a sine wave having a frequency of about 150 Hz is recorded and a track on which a modulated wave obtained by superposing a sine wave having a frequency of 2 to 10 Hz on the sine wave is recorded. And when played, gave audible sounds including those sinusoidal or modulated waves. Since the recording medium of this example can be usually reproduced by a general reproducing apparatus and is easy to handle and carry, the operator carries the recording apparatus with the reproducing apparatus to a place where he or she actually performs mental work, and is necessary before or during work. The audible sound according to the present invention can be heard according to. In addition, since the recording sub-code of this example is provided with a calling subcode for each modulated wave, it is easy for the operator and himself / herself to repeatedly listen only to the modulated wave that is most effective.

Next, the effects of the present invention will be specifically described with reference to experimental examples.

[0040]

[Experimental example] Five males and females aged 20 and under without neuropsychiatric disorders were examined, and stereo headphones were attached to their heads, and bioelectrodes for EEG measurement were fitted according to the International Electroencephalographic Society Union Standard Electrode Placement Method. did. Reference example except that the electroencephalograph "1A97A type" manufactured and sold by NEC Sanei Co., Ltd. equipped with a data processing device for the bioelectrode for electroencephalogram measurement, and the ultra-low frequency range was slightly expanded for stereo headphones. 4 was connected to a magnetic reproducing apparatus loaded with a recording medium produced in the same manner as in Example 4. Next, first, the subject is subjected to the Kraepelin test (continuous one-point addition work) as a mental work for 15 minutes without hearing the audible sound, during which the brain waves of the subject are detected and amplified. And a data recorder “XR-710” manufactured and sold by TEAC Corporation.
After the first half of the test was completed, the subject was allowed to rest for 5 minutes, and then, while listening to the audible sound, the latter half of the 15-minute Kraepelin test was loaded. During that time, the subject's brain waves were measured in the same manner as described above. After detection and amplification of the resulting data, it was recorded on a data recorder. The sound pressure of the audible sound was set to be about 70 dB on the eardrum of the subject.

After the test is completed, the data recorded in the data recorder is added and processed nine times by a signal processor “7T18A” manufactured and sold by NEC Sanei Co., Ltd.
After the frequency analysis, the Fmθ of 10 subjects was averaged to 1
Displayed as a topograph per minute. In addition, Fm derived from F3, Fz, and F4 in the subject's head during mental work for 15 minutes each in the first half and the second half.
For θ, the average intensity (microvolt) per minute for each of the first half 15 minutes and the second half 15 minutes was determined, and the obtained average intensity was substituted into Equation 1 for each part to obtain Fmθ.
The rate of increase (%) was calculated. The topography and the Fmθ increase rate were used as a guide for judging the Fmθ inducibility of each audible sound. The results are shown in Table 1 and FIGS.

[0042]

(Equation 1)

As a control, a system in which no audible sound is heard (hereinafter referred to as “control 1”) and an unmodulated wave, that is,
A system that allows only a sine wave having a frequency of about 150 Hz to be heard (hereinafter, referred to as “control 2”) was provided.

[0044]

[Table 1]

As is clear from the results in Table 1, all audible sounds commonly include a sine wave having a frequency of about 150 Hz, but a remarkable difference was observed in the Fmθ increase rate. That is, when the frequency of the very low frequency is in the range of about 20 Hz or less, the Fmθ increase rate is remarkably increased in all parts of F3, Fz, and F4, and is about 130% of control 1 depending on the derived part. Had also reached. 5 and 6
Also supports that the mental work while listening to the audible sound according to the present invention causes Fmθ to appear strong and centered on the midline of the frontal region of the subject. As can be seen from the results of Control 3 and Control 4 in Table 1, when the very low frequency exceeds 20 Hertz, Fmθ
No significant difference was observed in the rate of increase from Control 1 or Control 2, and some subjects complained of slight discomfort or decreased concentration, or a clear delay in the progress of the Kraepelin test.

From the above experimental facts, it is understood that a very low frequency of about 20 Hertz or less, especially about 2 to 10 Hertz, is suitable. Although data is not shown, the test was performed in the same manner as above while fixing the very low frequency around 8 Hz and changing the low frequency appropriately within the range of 50 to 6,000 Hz. When the frequency is about 100 to 500 Hz, the Fmθ increase rate is significantly increased, and is about 120 to 200 Hz.
Peaked at hertz. In addition, the frequency is about 150
An audible sound obtained by superimposing a sine wave having a frequency of about 8 Hertz on a sine wave of Hertz was tested in the same manner as described above while appropriately changing the modulation degree of the modulated wave.
At 0%, the Fmθ increase rate reached a peak. In addition to sine waves, we tested pulse waves such as sawtooth waves, square waves, triangle waves, and square waves.Pulses with relatively long durations were almost inferior to sine waves, but almost the same results were obtained. Was done.

Separately, the effects of the audible sound according to the present invention on the appearance of α-waves were tested on the above-mentioned 10 subjects. That is, a bioelectrode for measuring electroencephalogram and stereo headphones are attached to the head of the subject, and a frequency of about 1
An audible sound including a modulated wave obtained by superimposing a sine wave having a frequency of about 8 Hz on a sine wave of 50 Hz was heard. During that time, brain waves were measured by a conventional method, amplified, and recorded on a data recorder. After the test was completed, the recorded data was subjected to frequency analysis, and the α-wave having a period of 8 to 10 Hz was displayed as a topograph per minute at intervals of 5 minutes for 20 minutes immediately after the start of the measurement. Three days later, exactly the same experiment was performed on the same subject, except that no audible sound was heard. As a result, when the audible sound according to the present invention is heard, a remarkable change appears in the α wave of the subject, and the α wave when the audible sound is not heard is as shown in FIG.
When the audible sound according to the present invention is listened to, as shown in FIG. 8, the α-wave is strong around the parietal portion of the subject at the time of 15 minutes from the start of the audible sound and appears extremely widely. Was admitted. At the same time, the appearance of β waves was also significantly suppressed. This tendency was not substantially changed even if the very low frequency was changed in the range of about 2 to 10 Hz.

These facts suggest that the audible sound according to the present invention not only promotes the appearance of Fmθ, but also has the effect of promoting the appearance of α waves and suppressing the appearance of β waves. As described above, since the α wave and the β wave are brain waves corresponding to relaxation or tension of mind and body, the audible sound according to the present invention, when used with the eyes open, induces Fmθ to enhance attention and concentration, When used with eyes closed, the body and mind relax and rest.

As described above, since Fmθ is a good indicator of attention and concentration, the results of this experimental example show that the audible sound according to the present invention can be used for general mental work to reduce the attention and concentration of the user. It can be said that it indicates that the efficiency and accuracy of mental work are kept at a high level. This is also evident from the progress rate (%) of the Kraepelin test. As shown in Table 1, when the audible sound according to the present invention was heard, the progress rate of the work was significantly increased.

[0050]

The audible sound of the present invention, when audible to humans, prompts the appearance of Fmθ in its brain waves. Above all,
When the very low frequency is in the range of about 2 to 10 Hertz, it encourages not only Fmθ but also the appearance of α waves. Therefore, the audible sound of the present invention can be used by humans to listen to humans, thereby improving the desirable state of mind and body in which Fmθ and α waves are involved, that is, improving attention and concentration, and furthermore, relaxing the mind and body.
Encourage rest.

As described above, the audible sound of the present invention is not limited to improvement of attention and concentration, but also relaxation of mind and body.
Resting enhances learning and creativity, and furthermore, for example, mental disorders such as neurosis, mental retardation, psychosomatic disorder, manic depression, and chronic alcoholism, and, for example, television receivers, video displays, and OA equipment The reduction of thinking, concentration, work motivation, insomnia, malaise, intimidation, phobia, discomfort, etc. due to electromagnetic waves radiated from automobile spark plugs, etc. And effective for remission. Therefore, the audible sound according to the present invention can be used in general homes, workplaces, stadiums, schools, study schools, driving schools, training schools, laboratories, laboratories, ateliers, etc., to improve the efficiency and accuracy of mental work, learning ability, academic research ability, and creative ability Or, it is useful as a means for increasing concentration during competition, and as a means for preventing and treating various mental illnesses such as stress in workplaces, clinics, hospitals, nursing homes, and the like. Depending on the subject, if the audible sound according to the present invention is continuously listened for a long period of time, the appearance of Fmθ may be promoted even if the audible sound is listened for a very short time or not at all. For such a subject, the audible sound according to the present invention is useful as a means of so-called "mental training". And such useful audible sound can be relatively easily artificially obtained by the generating method according to the present invention.

Thus, it can be said that the present invention is a significant invention that greatly contributes to the art.

[Brief description of the drawings]

FIG. 1 is a block diagram of electrical components of an Fmθ guiding device for generating an audible sound according to the present invention.

FIG. 2 shows the Fmθ guiding device of Reference Example 1 and the Fm of Reference Example 4.
It is a waveform diagram of the audible sound given by the recording body for (theta) guidance.

FIG. 3 is a block diagram of electrical components of another Fmθ guiding device for generating an audible sound according to the present invention.

FIG. 4 is a block diagram showing an electric system for recording a modulated wave or the like according to the present invention on a magnetic recording medium.

FIG. 5 is a topograph showing Fmθ when a mental task is applied to a subject without hearing an audible sound.

FIG. 6 is a topograph showing Fmθ when a mental load is applied to a subject while listening to an audible sound according to the present invention.

FIG. 7 is a topograph showing an α-wave when a subject is placed in a closed-eye sitting position without hearing an audible sound.

FIG. 8 is a topograph showing an α-wave when the subject is closed with his / her eyes closed while listening to an audible sound according to the present invention.

[Explanation of symbols]

 O1, O2 Oscillation circuit A1, A2 Amplification circuit M Modulation circuit V1 to V4 Variable resistance S Changeover switch C connector P Headphone FSM Frequency modulation circuit RFP High frequency power amplification circuit FSR reception circuit ANT1, ANT2 Antenna 1 Microprocessor 2 Frequency sequence storage circuit 3 Continuous sequence storage circuit 4 Clock oscillator 5 Interface 6 Modulated wave generation circuit 7 Magnetic recording device 8 Magnetic tape

Claims (12)

[Claims] 1. An audible sound that induces Fmθ including a modulated wave in which an extremely low frequency having a frequency of about 20 Hz or less is superimposed on a low frequency in an audible range. 2. The low frequency of the audible range is about 120 to 2
The audible sound that induces Fmθ according to claim 1, which is 00 Hertz. 3. The audible sound that induces Fmθ according to claim 1, wherein the very low frequency is about 2 to 10 Hertz. 4. The audible sound for inducing Fmθ according to claim 1, wherein the modulation degree of the modulated wave is in a range of about 30 to 100%. 5. The audible sound for inducing Fmθ according to claim 1, 2, 3 or 4, wherein the frequency, appearance frequency, duration and / or intensity of the audible sound varies according to the 1 / f fluctuation rule. 6. The audible sound that induces Fmθ according to claim 1, 2, 3, 4, or 5, wherein the low frequency and the very low frequency have a sinusoidal waveform. 7. An electro-acoustic conversion of an electric signal including a modulated wave obtained by superimposing an ultra-low frequency on an obtained low frequency by amplitude-modulating a low frequency in an audible range at a very low frequency of about 20 Hertz or less. A method of generating an audible sound that induces Fmθ. 8. The low frequency in the audible range is about 120 to 2
The method of generating an audible sound that induces Fmθ according to claim 7, wherein the frequency is 00 Hertz. 9. The method for generating an audible sound for inducing Fmθ according to claim 7, wherein the very low frequency is about 2 to 10 Hertz. 10. A modulation degree of a modulated wave is about 30 to 100%.
The method for generating an audible sound for inducing Fmθ according to claim 7, 8 or 9, wherein 11. The method according to claim 7, 8, 9 or 10, wherein the frequency, appearance frequency, duration and / or intensity of the audible sound varies according to the 1 / f fluctuation rule. . 12. The method for generating audible sound for inducing Fmθ according to claim 7, wherein the low frequency and the very low frequency have a sinusoidal waveform.