JP5114615B2 - Sound playback device - Google Patents

Description

  The present invention relates to a sound reproducing device, and more particularly, to a sound reproducing device that outputs auxiliary sound that allows a listener to hear music or sound more clearly.

  Traditionally, educational facilities such as elementary schools and junior high schools have music rooms that can accommodate a relatively large number of people, and children and students can listen to singing and listening to music. .

In such a place, the sound absorption characteristics and reverberation time characteristics of the walls and ceiling are optimized, so that singing voices and music can reach the listener in any position in the music room (for example, Patent Document 1). reference.).
JP 2006-138078 A

  However, in a music room that can accommodate a relatively large number of people, although it is a relatively small sound, there are many annoying noises such as the listener's speaking voice and the sound of searching for baggage, and it may not be possible to hear music and voice clearly. It was.

  In addition, even when music or sound is amplified by sound amplification equipment and output from a speaker or the like, the listener may not be able to hear clearly because of surrounding noise.

  The present invention has been made in view of such circumstances, and even if there is a relatively small amount of noise, the listener can listen to any sound (hereinafter referred to as a target sound) such as a target music or voice. Provided is a sound reproducing device capable of outputting auxiliary sound that enables clear listening.

In order to solve the above-described problem, the sound reproducing device according to the present invention is a sound reproducing device that outputs predetermined sounds from the left and right speakers, respectively, the first sound having a constant frequency, and the first sound. When the first sound is output from any one of the speakers while alternately switching the second sound having a frequency higher than that of the sound at predetermined intervals, the second sound is output from the other speaker. When outputting the second sound and outputting the second sound, the first sound is output as a sound having a higher frequency than the first sound, and then the frequency of the first sound is changed to change the first sound . The second sound is output as a sound having a higher frequency than the first sound .

The sound reproducing device according to the present invention is also characterized by the following points.
(1) A third sound having a pulse waveform with a frequency lower than that of the first sound and having a duty ratio larger than 0 and equal to or less than 0.5 is output by overlapping the first sound and the second sound. Make it.
(2) The third sound is output by 15 to 30 dB smaller than the first sound and the second sound, and the fourth sound including any music and / or sound effect is output from the first sound and the second sound. Overlapping and outputting the first and second sounds in a state that is larger by 15 to 40 dB than the first sound and the second sound, or overlapping and outputting each of the third sounds.

In the sound reproducing device according to claim 1, while alternately switching a first sound having a constant frequency and a second sound having a higher frequency than the first sound at a constant interval, When the first sound is output from a speaker, the second sound is output from the other speaker, and when the second sound is output, the first predetermined period is the first time. Since the sound is output as a sound having a frequency higher than that of the first sound, and then the frequency of the first sound is changed to output the second sound as a sound having a frequency higher than that of the first sound. However, the target sound is heard while listening to the auxiliary sound composed of the first sound and the second sound, and the target sound can be clearly heard without worrying about relatively small noise.

  In the sound reproduction device according to claim 2, since the third sound having a pulse waveform with a frequency of 20 to 25 Hz and a duty ratio of greater than 0 and less than or equal to 0.5 is output. It is possible to prevent the noise that has become unintentional from starting to become anxious again, and the target sound can be clearly heard without worrying about relatively small noise over a long period of time.

  In the sound reproducing device according to claim 3, the third sound is output by 15 to 30 dB smaller than the first sound and the second sound, and any music and / or sound effect is output. Because the fourth sound is output by 15 to 40 dB larger than the first sound and the second sound, the fourth sound that is the target sound is combined with the first to third sounds. Can be output at a sound pressure that is easy for the listener to hear, and the target sound can be heard without worrying about noise.

  The present invention is a sound reproducing device that outputs predetermined sounds from left and right speakers, respectively, and a first sound having a constant frequency and a second sound having a higher frequency than the first sound are spaced at regular intervals. When the first sound is output from any one of the speakers while switching alternately, the second sound is output from the other speaker and the second sound is output. In this case, a sound reproducing apparatus is provided that outputs a sound having a frequency higher than that of the first sound for the first predetermined period and then outputs a sound having a frequency higher than that of the first sound.

  Specifically, it is a sound reproducing device that outputs predetermined sounds from the left and right speakers, respectively, and a first sound having a frequency of 75 to 128 Hz and a frequency that is higher by 4 to 13 Hz than the first sound. When the first sound is output from any one of the speakers while alternately switching the second sound at intervals of 0.5 to 5 seconds, the second sound is output from the other speaker. When outputting the second sound, the first sound is output as a sound having a frequency higher by 4 to 7 Hz than the first sound for the first 45 to 90 seconds, and thereafter, the sound is output from the first sound. The present invention provides a sound reproducing apparatus that outputs sound having a high frequency of 8 to 13 Hz.

  That is, when the listener is listening to the target sound, even if there is some noise around the listener, the sound that can output the auxiliary sound that allows the target sound to be heard clearly without worrying about the noise. A playback device is provided. In addition, the sound reproducing apparatus according to the present invention functions like a so-called noise canceller by outputting auxiliary sound.

  Here, sound means sound having a frequency in the range of about 20 to 20000 Hz that can be heard by humans, and sound of sound, which is caused by a single frequency vibration, voice or music whose frequency changes, ripple, It is a concept that includes the sound of noise, noise, and the like.

  A speaker means any device that can convert an acoustic signal generated from acoustic data recorded on a recording medium of acoustic data into air vibration and output it as sound. In this specification, a dynamic speaker, headphones Including earphones.

  The acoustic data refers to data in which an acoustic signal is formed by the acoustic signal generation means and can be output as the first to fourth sounds from the speaker. Analog data, digital data, MIDI data (standard MIDI file) ), The conversion format of the data such as MP3 data is not particularly limited. Further, the presence / absence of data encryption and the compression / non-compression of data may be any, and the compression format is not limited.

  The recording medium refers to a medium that can record acoustic data, and the acoustic data is accumulated by electrical, magnetic, optical, mechanical, or chemical action, and the acoustic data is read by the playback device. Things that can be done. Among such recording media, those removable from the relaxation support device described later include, for example, a floppy (registered trademark) disk, a magneto-optical disk, a CD-ROM, a CD-R / W, a DVD, a DAT, an 8 mm tape, There are memory cards.

  As a recording medium fixed to the computer, there are a hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory) and the like.

  Further, here, the concept includes a server or the like that downloads acoustic data via a network.

  The first sound is sound output from either one of the left and right speakers, and can have a frequency of 75 to 128 Hz, for example.

  Here, if the frequency of the first sound is less than 75 Hz, if the target sound is, for example, music, it interferes with the bass sound of the music, which is not preferable.

  Also, if the frequency of the first sound exceeds 128 Hz, the listener may feel uncomfortable when listening to the first sound, and the consciousness may be lost from the target sound, and the target sound includes a human voice. If it is a thing, there is a possibility of interfering with a low voice such as a man, which is not preferable.

  By setting the first sound within the range of 75 to 128 Hz, more preferably within the range of 100 to 110 Hz, the first sound does not cause the listener to feel uncomfortable and does not interfere with a low voice such as a man. 1 sound.

  In particular, when the first sound is set to 100 to 110 Hz, it is more preferable because the first sound that is most uncomfortable for the listener can be obtained.

  The second sound is a sound output from either one of the left and right speakers, and has a frequency higher by 4 to 13 Hz than the first sound.

  That is, the frequency difference between the first sound and the second sound is 4 to 13 Hz.

  The auxiliary sound includes at least a first sound and a second sound.

  When the frequency difference of the second sound is below 4 Hz, it cooperates with the first sound to induce an electroencephalogram that should appear in a deep sleep state called a δ wave in the brain, and the listener can This is not preferable because it may interfere with listening to the sound.

  Also, if the frequency difference of the second sound exceeds 13 Hz, the brain wave that should appear in the awake state called β wave is induced in the brain by cooperating with the first sound, and relaxed. This is not preferable because the target sound may not be heard.

  By increasing the frequency of the second sound so that the frequency difference from the first sound is 4 to 13 Hz, it is possible to make the brain suitable for relaxing and to worry about noise. The target sound can be heard clearly without being concentrated.

  Then, as a feature of the present invention, the sound reproducing device can switch the first sound and the second sound from one of the speakers while alternately switching between the first sound and the second sound at intervals of 0.5 to 5 seconds. Is output from the other speaker.

  That is, the auxiliary sound is configured by switching the left and right of the speaker that outputs the first sound and the second sound at intervals of 0.5 to 5 seconds, more preferably at intervals of 1 to 2.5 seconds. Yes.

  In general, the human brain naturally functions to balance left and right. Therefore, for example, when a long period of time elapses with the right ear listening to the first sound and the left ear listening to the second sound, the right and left biases gradually become apparent in the brain, causing stress. I feel it.

  Therefore, this bias is prevented by causing the first sound and the second sound to be switched left and right at intervals of 0.5 to 5 seconds, more preferably at intervals of 1 to 2.5 seconds, and stress occurs. I try to avoid that.

  Here, if the left / right switching timing between the first sound and the second sound is less than 0.5 seconds, the target sound may not be heard clearly in noise, which is not preferable.

  Also, if the left / right switching timing exceeds 5 seconds, the sound heard from the left and right ears in the brain is biased, which may cause stress and is not preferable.

  By making the left / right switching timing preferably within the range of 1 to 2.5 seconds, the target sound can be heard clearly in the noise and the bias to the sound heard from the left and right ears can be prevented. Stress can be avoided.

  In other words, it is possible to further improve the environment where the target sound can be clearly heard without being concerned about noise.

  The waveforms of the first sound and the second sound are not particularly limited, and may be any of a sine wave, a rectangular wave, a triangular wave, etc., but preferably a sine wave.

  By using a sine wave, smoothness can be generated in the first sound and the second sound, and the stress generated when the listener listens to the first sound and the second sound can be further reduced. it can.

  In addition, when the second sound is output, the sound reproducing device outputs the sound having a frequency higher by 4 to 7 Hz than the first sound for the first 45 to 90 seconds, and then the first sound. Alternatively, the sound may be output as a high frequency sound by 8 to 13 Hz.

  That is, for the first 45 to 90 seconds, it is preferable to keep the frequency difference at 4 to 7 Hz and then set the frequency difference to 8 to 13 Hz.

  By outputting the sound in this way, first, the consciousness is quickly diverted from the noise, and then the state is shifted to a state where the target sound can be clearly heard.

  As a result, the listener can concentrate and listen to the target sound clearly without worrying about noise in a relatively short time.

  Here, if the state where the frequency difference is 4 to 7 Hz is less than 45 seconds, there is a possibility that the consciousness is not deviated from the noise and the target sound cannot be heard clearly.

  Moreover, even if the frequency difference of 4 to 7 Hz exceeds 90 seconds, it is not possible to expect a further effect that distracts from the noise, but rather, it wastes time to hear the target sound clearly. Therefore, it is not preferable.

  When the frequency difference is 4 to 7 Hz, it is possible to quickly distract from the noise by setting it to 45 to 90 seconds, more preferably 50 to 70 seconds, and to hear the target sound clearly as soon as possible. it can.

  In addition, the sound reproducing device may be configured to output a third sound having a pulse waveform with a frequency of 20 to 25 Hz and a duty ratio of greater than 0 and less than or equal to 0.5.

  As described above, the listener can quickly deviate from the noise and hear the target sound clearly when the listener listens to the first sound and the second sound simultaneously from the left and right separate ears. However, with the passage of time, you may become accustomed and you may be worried about the noise again.

  This is considered to be due to the fact that the first sound and the second sound have a constant frequency.

  Therefore, by outputting a third sound having a pulse waveform with a frequency of 20 to 25 Hz and a duty ratio greater than 0 and less than or equal to 0.5, a slight load is applied to the brain to avoid habituation. The target sound can be heard clearly over a long period of time.

  In other words, the auxiliary sound is composed of the first to third sounds, and the third sound is a sound output for 20 to 28 milliseconds and repeated 20 to 25 times per second.

  A duty ratio of 0 is not preferable because a pulse waveform is not obtained.

  On the other hand, if the duty ratio exceeds 0.5, the length of the sound per cycle of the pulse wave is too long and is close to a continuous sound, which may be harsh to the listener.

  It is desirable that the third sound is output from both the left and right speakers.

  In addition, the third sound is output by 15 to 30 dB smaller than the first sound and the second sound, and the fourth sound including any music and / or sound effect is output as the first sound. In addition, the output may be larger by 15 to 40 dB than the second sound.

  That is, the target sound may be output as the fourth sound from the speaker of the sound reproducing apparatus together with the first to third sounds (auxiliary sound).

  In addition, the sound pressure of each sound may be adjusted in the above-described range of the sound pressure level so that the third sound <the first sound and the second sound <the fourth sound.

  With this configuration, the listener can hear the target sound (fourth sound) more clearly.

  Here, first, it is preferable to output the sound pressure of the third sound by 15 to 30 dB smaller than the sound pressure of the first sound and the second sound.

  If the difference between the sound pressure of the third sound and the sound pressure of the first and second sounds is smaller than 15 dB, the third sound becomes noticeable, which is not preferable.

  In addition, if the difference between the sound pressure of the third sound and the sound pressure of the first and second sounds is greater than 30 dB, the effect of the third sound is weakened, and once the noise is no longer concerned, This is not preferable.

  Further, the sound pressure of the fourth sound may be output by 15 to 40 dB larger than the sound pressure of the first sound and the second sound.

  If the difference between the sound pressure of the fourth sound and the sound pressure of the first and second sounds is less than 15 dB, the first and second sounds will be conspicuous compared to the fourth sound, This is not desirable because it makes it difficult for the listener to turn his consciousness toward the fourth sound.

  In addition, if the difference between the sound pressure of the fourth sound and the sound pressure of the first and second sounds is larger than 40 dB, it is difficult for the listener to clearly hear the fourth sound. It is not preferable.

  That is, the sound pressure of the third sound is output by 15 to 30 dB smaller than the sound pressure of the first sound and the second sound, and the sound pressure of the fourth sound is the first sound and the second sound. By maintaining the relationship of outputting 15 to 40 dB larger than the sound pressure of the second sound, the listener can hear the target sound (fourth sound) more clearly without worrying about noise.

  Hereinafter, the sound reproducing apparatus according to the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 is an overall view of the sound reproducing device B. The sound reproducing device B is composed of left and right speakers 5 and 6 and a reproducing device main body 7.

  The left and right speakers 5 and 6 are dynamic speakers and have a structure in which air is vibrated by a diaphragm disposed in a voice coil to generate sound that can be heard by human ears.

  The left and right speakers 5 and 6 are respectively provided with a left acoustic signal transmission cable 8 and a right acoustic signal transmission cable 9, and serve to transmit the acoustic signals output from the reproduction apparatus body 7 to the left and right speakers 5 and 6. Is responsible.

  An acoustic signal output male terminal 12 is formed at the distal end of the left and right acoustic signal transmission cables 8 and 9 on the reproduction apparatus main body side. By connecting the acoustic signal output male terminal 12 to the reproduction apparatus main body 7, The signal can be transmitted to the left and right speakers 5 and 6 via the left and right acoustic signal transmission cables 8 and 9.

  Further, the left and right speakers 5 and 6 have amplifiers (not shown) built in, and by inserting the plug 11 of the power cable 10 into an outlet, the sound signal can be amplified and sound can be output. I have to.

  The playback device body 7 is a digital audio player that can play back sound data in which sound signals that vibrate the left and right speakers 5 and 6 are converted in a predetermined format, and can generate sound signals from a recording medium that records sound data. is doing.

  More specifically, the playback apparatus main body 7 has a substantially rectangular parallelepiped housing, and the front panel 13 of the playback apparatus main body 7 includes a liquid crystal display unit 40 formed of a TFT liquid crystal panel.

  Further, the front panel 13 is formed with an operation unit 15 composed of five keys 14. The operation unit 15 selects a plurality of control programs stored in advance in the reproduction apparatus main body 7 or executes them. It functions as an input means for inputting instructions.

  In addition, an external input / output terminal 16 is provided on the side surface of the reproduction apparatus main body 7. The external input / output terminal 16 is provided for connecting peripheral expansion devices to the playback apparatus main body 7, and can be connected to, for example, a charging cable or a personal computer.

  The liquid crystal display unit 40, the keys 14, and the external input / output terminal 16 are connected to a circuit board 17 disposed inside the reproducing apparatus main body 7, and a processing program stored in the circuit board 17 in advance. And so on.

  In addition, the upper portion 18 of the reproduction apparatus main body 7 is provided with an acoustic signal output female terminal 19 that can be fitted to the aforementioned acoustic signal output male terminal 12.

  The acoustic signal output female terminal 19 outputs an acoustic signal generated by the reproducing apparatus main body 7 so that the acoustic signal can be transmitted to the left and right speakers 5 and 6 via the acoustic signal output male terminal 12.

Next, with reference to FIG. 2, a description will be given of the circuit board 17 which is disposed inside the reproducing apparatus main body 7. FIG. 2 is a block diagram of the circuit board 17.

  The circuit board 17 includes a CPU 30 that functions as a control unit of the reproducing apparatus main body 7, a ROM 31 as a read-only memory, and a RAM 32 as a readable / writable memory.

  The CPU 30 is connected to a ROM 31, a RAM 32, and the like, and has a function of executing various processes according to a program stored in the ROM 31.

  The ROM 31 stores a control program for the CPU 30 related to the generation of an acoustic signal, an interface program (so-called operation system) for simplifying the operation of the playback device main body 7 performed by the user of the sound playback device B, and the like. .

The RAM 32 has a function of storing various flags and variable values necessary for the above-described program as a temporary storage area of the CPU 30 .

  The circuit board 17 includes an acoustic data recording RAM 33, an external input / output terminal 16, a key input switch 34, a liquid crystal display unit 40, and a codec circuit unit 35. The acoustic data recording RAM 33, the external input / output terminal 16, the key input switch 34, the liquid crystal display unit 40, and the codec circuit unit 35 are connected to the CPU 30, respectively.

  The acoustic data recording RAM 33 functions as a recording medium on which acoustic data is recorded, and acoustic data for outputting the first to fourth sounds is stored in a predetermined conversion format. The acoustic data recording RAM 33 enables the CPU 30 to read the acoustic data and allows the CPU 30 to write the acoustic data.

  That is, the acoustic data sent from the external input / output terminal 16 or the codec circuit unit 35 to the CPU 30 can be written in the acoustic data recording RAM 33.

  The external input / output terminal 16 is a USB (Universal Serial Bus) standard terminal for connecting a charging cable, a peripheral expansion device such as a personal computer, and the reproduction device main body 7, and includes a peripheral expansion device and a reproduction device. Acoustic data and power can be supplied to and from the main body 7.

  The key input switch 34 is a switch disposed on the circuit board 17 so as to face the front panel 13, and is disposed at a position corresponding to each key 14 disposed on the operation unit 15.

  The key input switch 34 is a switch that is turned on while each key 14 is being pressed, and the CPU 30 detects which key 14 has been pressed by detecting the key input switch 34 that has been turned on. Can be determined.

  The liquid crystal display unit 40 displays a processing state (processing result) such as the above-described program such as a title display of the acoustic data stored in the acoustic data recording RAM 33 and a reproduction state of the acoustic data to the user. It is.

  The codec circuit unit 35 constitutes a part of an acoustic signal generating means for converting the acoustic data recorded in the above-described acoustic data recording RAM 33 in a predetermined format into an acoustic signal.

  That is, the codec circuit unit 35, the CPU 30, the ROM 31, and the RAM 32 function as acoustic signal generating means for forming an acoustic signal from the acoustic data recorded in the acoustic data recording RAM 33 by cooperating with each other.

  An audio circuit unit 36 is connected to the codec circuit unit 35. The audio signal output female terminal 19 is connected to the audio circuit unit 36, and the audio signal transmitted from the codec circuit unit 35 is transmitted to the audio signal output male terminal 12 via the audio signal output female terminal 19.

  In this way, the sound reproducing device B according to the present embodiment reproduces the first to fourth sounds.

  Next, the sound output from the left and right speakers 5 and 6 of the sound reproducing device B will be described with reference to FIGS.

  In the present embodiment, the sound output from the left and right speakers 5 and 6 has a frequency difference of 6 Hz for 60 seconds after the start of sound output, and the frequency difference of 7 Hz after 60 seconds.

  When the first sound and the second sound are alternately switched at intervals of 2 seconds and the first sound is output from either speaker, the second sound is output from the speaker. Was output.

  The first sound is a 107 Hz sine wave, and the second sound is a 113 Hz sine wave.

  The first and second sounds are output from the left and right speakers as shown in FIG. FIG. 3 is an explanatory diagram showing acoustic waveforms output from the left and right speakers. First, the upper part of FIG. 3 shows a part of a waveform for 2 seconds after starting to reproduce the first to fourth sounds. The vertical axis represents sound pressure, and the horizontal axis represents time (t: unit is seconds).

  As shown in the upper part of FIG. 3, in this embodiment, when 0 <t <2, the first sound is output from the left speaker 6, while the second sound is output from the right speaker 5.

  At the same time, the left speaker 6 and the right speaker 5 simultaneously output a pulse wave (duty ratio: 0.1) as the third sound and a relatively gentle classical music as the fourth sound (target sound). is doing.

  At this time, the relationship between the sound pressure of the first and second sounds and the sound pressure of the third sound is such that the sound pressure of the third sound is higher than the sound pressure of the first sound and the second sound. The output is reduced by 15 to 30 dB.

  The relationship between the sound pressure of the first and second sounds and the sound pressure of the fourth sound is such that the sound pressure of the fourth sound is 15 than the sound pressure of the first sound and the second sound. It is output so as to increase by ~ 40 dB.

  With such a sound pressure relationship, the listener can clearly hear the fourth sound, which is the target sound, without being annoying to the listener and without worrying about ambient noise.

  Next, as shown in the middle part of FIG. 3, when 2 ≦ t <4, the first sound is output from the right speaker 5, while the second sound is output from the left speaker 6.

  Also in this case, of course, the relationship between the sound pressures of the first to fourth acoustics described above is maintained.

  At this time, the third sound and the fourth sound may be switched between left and right of the output speaker, or may not be switched.

  Next, as shown in the lower part of FIG. 3, when 4 ≦ t <6, the first sound is output from the left speaker 6 as in the case of 0 <t <2, and the second sound is output to the right speaker 5. Is output from.

  In this way, by switching the speakers that output the first sound and the second sound at predetermined intervals within a range of 0.5 to 5 seconds, the right and left biases gradually become apparent in the brain, causing stress. It can be prevented from occurring.

  By the way, when the fourth sound is a normal music piece, the sound pressure may be lower at a relatively quiet melody portion than at a normal melody portion.

  In a normal melody part, the listener's consciousness is suitable for the fourth sound with the highest sound pressure, so the first to third sounds (hereinafter also referred to as brain wave induced sounds) are actually heard. It is a state that I do not notice.

  However, if the sound pressure of the auxiliary sound is not adjusted when the sound pressure of the fourth sound becomes low, the difference in sound pressure between the auxiliary sound and the fourth sound becomes small, and the listener notices the auxiliary sound. There is a risk that.

  If the listener notices the auxiliary sound, the consciousness will be deviated (attention) from the fourth sound, and the fourth sound may not be heard clearly.

  Therefore, in the present embodiment, even when the sound pressure of the fourth sound becomes low, the sound pressure of the auxiliary sound is lowered so as to maintain the above-described relationship between the sound pressures.

  That is, as shown in FIG. 4, even when the sound pressure of the fourth sound decreases with time, the relationship between the sound pressure of the first and second sounds and the sound pressure of the third sound is The sound pressure of the first and second sounds and the fourth sound are output so that the sound pressure of the third sound is smaller by 15 to 30 dB than the sound pressure of the first and second sounds. The sound pressure of the fourth sound is output so that the sound pressure of the fourth sound is higher by 15 to 40 dB than the sound pressure of the first sound and the second sound.

  By adjusting the sound pressure in this way, the consciousness can be directed to the fourth sound and the noise can be avoided without making the listener aware of the auxiliary sound.

  Then, after 60 seconds have passed since the start of sound output from the speaker, the first sound is a 105-Hz sine wave and the second sound is a 112-Hz sine wave so that the fourth sound can be heard clearly. Yes.

  That is, it leads to a state in which the listener does not care about noise until 60 seconds after the start of sound output from the speaker, and the fourth sound can be clearly heard after 60 seconds.

  Therefore, compared to the case where the frequency difference between the first and second sounds is 7 hertz immediately after the start of sound output from the speaker, the fourth sound is clearly clarified without worrying about noise. Can be heard.

  Even in a state where the frequency difference between the first and second sounds after 60 seconds is 7 hertz, the first sound and the second sound are switched between the left and right speakers to be output as shown in FIG. I am doing so. At the same time, the relationship between the above-described sound pressures is also maintained.

  By configuring the first to fourth sounds as described above, even when listening to sounds of different frequencies on the left and right over a long period of time, there will be no bias in the brain, and noise will be a concern. The fourth sound can be heard clearly and promptly.

  The first to fourth sounds are recorded in a predetermined recording format to form an acoustic data recording medium, and the acoustic data recording medium is provided to an acoustic reproducing apparatus that can reproduce the recorded acoustic data, By letting the listener hear the output sound, an α wave or a θ wave may be induced in the listener's brain to cause a relaxation effect.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications other than the above-described embodiments can be made according to the design and the like as long as they do not depart from the technical idea according to the present invention.

  In the present embodiment, the left and right speakers 5 and 6 of the dynamic speaker type are connected to the sound reproducing device and the first to fourth sounds are output. For example, the fourth sound can be obtained by using stereo headphones or stereo earphones. Can be heard more clearly, and α-waves and θ-waves can be effectively induced in the brain of the listener to produce a relaxation effect.

  The place where the sound reproducing apparatus according to the present embodiment is installed is not limited to the music room, and can be installed in any place such as an audiovisual room, an auditorium, a hall, a movie theater, a living room, and the like. You may be able to carry without having to.

1 is an overall view of a sound reproducing device. It is a block diagram of the circuit board built in the sound reproducing device. It is explanatory drawing which showed the waveform of the sound output from each speaker of right and left. It is explanatory drawing which showed the waveform of the sound output from each speaker of right and left.

Explanation of symbols

B sound reproduction device 5 right speaker 6 left speaker 7 reproduction device main body 8 left sound signal transmission cable 9 right sound signal transmission cable 12 sound signal output male terminal 17 circuit board 19 sound signal output female terminal 30 CPU
31 ROM
32 RAM
33 Sound data recording RAM
35 Codec circuit part 36 Audio circuit part

Claims (3)

A sound reproducing device that outputs predetermined sounds from left and right speakers,
The first sound is output from either one of the speakers while alternately switching a first sound having a constant frequency and a second sound having a higher frequency than the first sound at a constant interval. The second sound is output from the other speaker, and
When outputting the second sound, the first sound is output as a sound having a higher frequency than the first sound, and then the frequency of the first sound is changed to change the second sound to the first sound. A sound reproducing apparatus that outputs a sound having a higher frequency than the sound of 1 .   A third sound having a lower frequency than the first sound and having a pulse waveform with a duty ratio greater than 0 and less than or equal to 0.5 is output by overlapping the first sound and the second sound. The sound reproducing device according to claim 1, wherein The third sound is output by 15 to 30 dB smaller than the first sound and the second sound, and
A fourth sound composed of an arbitrary music piece and / or sound effect is output in a state of being 15 to 40 dB larger than the first sound and the second sound, being overlapped with the first sound and the second sound, or The sound reproduction apparatus according to claim 2, wherein the sound reproduction apparatus outputs the third sound in an overlapping manner.

Images