JPWO2017086353A1 - Output sound generation device, output sound generation method, and program - Google Patents

Abstract

  It produces an output sound that is difficult to hear as an unpleasant sound and can reduce discomfort. An output sound generation device that generates an output sound for controlling the body includes at least an acquisition unit 1 that acquires sound information indicating a sound to be modulated based on a base sound that is a base of the output sound, and the output sound. Modulation that generates a modulated sound in which at least one of the volume, pitch, and tone of the sound indicated by the sound information is periodically changed, or a modulated sound in which the sound indicated by the sound information is periodically continued A sound generation unit 3.

Description

  This application claims the benefit of priority with respect to Japanese Patent Application No. 2015-227048 filed on November 19, 2015, the contents of which are incorporated herein by reference.

  The following disclosure relates to an apparatus, a method, and a program for generating output sound.

  In recent years, research for improving sleep and imparting a relaxation effect has been conducted. As a method to lead a person to sleep or to relax, the two different sounds, known as binaural beats, are given to the left and right ears, respectively, to change the frequency of the brain waves to the frequency difference between the two sounds. A technique for guiding is known (see Japanese Patent No. 2750502).

  However, binaural beats may be heard as an annoying sound of “pea” when heard alone. Moreover, although the operation sound of a machine etc. is easy to hear as noise only with the sound, if it is a sound which cooperates with such an operation sound, an unpleasant feeling can be eased.

  An object of the present invention is to provide a technique for generating an output sound that is difficult to hear as an unpleasant sound and can reduce discomfort.

  An output sound generation device according to an embodiment of the present invention is an output sound generation device that generates an output sound for controlling the body, and generates a sound to be modulated based on a base sound that is a base of the output sound. A sound that is included in the output sound, and is a modulated sound in which at least one of the volume, pitch, and tone of the sound indicated by the sound information is periodically changed, or A modulated sound generating unit that generates a modulated sound in which the sound indicated by the sound information is periodically continued.

  According to the disclosure of the present embodiment, it is possible to generate an output sound that is difficult to hear as an unpleasant sound and can reduce discomfort.

FIG. 1 is a block diagram illustrating a schematic configuration of the output sound generation device according to the first embodiment. FIG. 2 is a diagram summarizing the types, frequencies, and characteristics of electroencephalograms. FIG. 3 outputs one of the two output sounds generated by the adding unit from one of the two output units, and two of the two generated by the adding unit from the other of the two output units. It is a block diagram which shows the structure which outputs the other of the output sounds. FIG. 4 is a diagram illustrating a sound, a frequency of the sound, and a frequency difference between the sound and a sound that is a semitone below. FIG. 5 is a diagram illustrating a sound that can be used as an added sound when the key is C major, and an upper limit value of a frequency difference for the sound. FIG. 6 is a diagram illustrating a sound that can be used as an added sound when the key is C # major, and an upper limit value of a frequency difference for the sound. FIG. 7 is a diagram illustrating a sound that can be used as an added sound when the key is D major, and an upper limit value of a frequency difference for the sound. FIG. 8 is a diagram illustrating a sound that can be used as an additional sound when the key is D # major, and an upper limit value of a frequency difference for the sound. FIG. 9 is a diagram showing a sound that can be used as an additional sound when the key is E major, and an upper limit value of a frequency difference for the sound. FIG. 10 is a diagram showing a sound that can be used as an added sound when the key is F major, and an upper limit value of a frequency difference for the sound. FIG. 11 is a diagram illustrating a sound that can be used as an added sound when the key is F # major, and an upper limit value of a frequency difference for the sound. FIG. 12 is a diagram illustrating a sound that can be used as an additional sound when the key is G major, and an upper limit value of a frequency difference for the sound. FIG. 13 is a diagram illustrating a sound that can be used as an additional sound when the key is G # major, and an upper limit value of a frequency difference for the sound. FIG. 14 is a diagram showing a sound that can be used as an added sound when the key is A major, and an upper limit value of a frequency difference for the sound. FIG. 15 is a diagram illustrating a sound that can be used as an additional sound when the key is A # major, and an upper limit value of a frequency difference for the sound. FIG. 16 is a diagram showing a sound that can be used as an added sound when the key is B major, and an upper limit value of a frequency difference for the sound. FIG. 17 is a diagram illustrating a sound that can be used as an additional sound when the key is C minor, and an upper limit value of a frequency difference for the sound. FIG. 18 is a diagram illustrating a sound that can be used as an added sound when the key is C # minor and an upper limit value of a frequency difference for the sound. FIG. 19 is a diagram showing a sound that can be used as an additional sound when the key is D minor, and an upper limit value of a frequency difference for the sound. FIG. 20 is a diagram illustrating a sound that can be used as an added sound when the key is D # minor and an upper limit value of a frequency difference for the sound. FIG. 21 is a diagram illustrating a sound that can be used as an added sound when the key is E minor, and an upper limit value of a frequency difference for the sound. FIG. 22 is a diagram illustrating a sound that can be used as an additional sound when the key is F minor and an upper limit value of a frequency difference for the sound. FIG. 23 is a diagram illustrating a sound that can be used as an additional sound when the key is F # minor, and an upper limit value of a frequency difference for the sound. FIG. 24 is a diagram illustrating a sound that can be used as an added sound when the key is G minor, and an upper limit value of a frequency difference for the sound. FIG. 25 is a diagram illustrating a sound that can be used as an added sound when the key is G # minor, and an upper limit value of a frequency difference for the sound. FIG. 26 is a diagram illustrating a sound that can be used as an additional sound when the key is A minor, and an upper limit value of a frequency difference for the sound. FIG. 27 is a diagram showing a sound that can be used as an added sound when the key is A # minor and an upper limit value of a frequency difference for the sound. FIG. 28 is a diagram showing a sound that can be used as an added sound when the key is B minor and an upper limit value of a frequency difference for the sound. FIG. 29 is a diagram illustrating a sine wave. FIG. 30 is a block diagram illustrating a schematic configuration of an output sound generation device according to the fourth embodiment. FIG. 31 is a block diagram illustrating a schematic configuration of an output sound generation device according to the seventh embodiment. FIG. 32 is a block diagram illustrating a schematic configuration of an output sound generation device according to the eighth embodiment. FIG. 33 is a block diagram illustrating a schematic configuration of the output sound generation device according to the ninth embodiment. FIG. 34 is a block diagram illustrating a schematic configuration of the output sound generation device according to the tenth embodiment. FIG. 35 is a block diagram illustrating a schematic configuration of the output sound generation device according to the eleventh embodiment. FIG. 36A is a schematic view illustrating the frequency and amplitude of a bass sound in Example 4 of the eleventh embodiment. FIG. 36B is a schematic view illustrating a modulated sound that cancels out fluctuations in the amplitude of the bass sound illustrated in FIG. 36A. FIG. 36C is a schematic diagram illustrating the amplitude when the base sound and the modulated sound illustrated in FIG. 36B are superimposed. FIG. 37 is a diagram illustrating the frequency spectrum of the modulated sound in Example 5 of the eleventh embodiment. FIG. 38A is a diagram illustrating a frequency spectrum of a bass sound in Example 6 of the eleventh embodiment. FIG. 38B is a diagram illustrating the frequency spectrum of the modulated sound in Example 6 of the eleventh embodiment. FIG. 39 is a block diagram illustrating a schematic configuration of the output sound generation device according to Example 1 of the fourteenth embodiment. FIG. 40 is a block diagram illustrating a schematic configuration of the output sound generation device according to Example 2 of the fourteenth embodiment. FIG. 41 is a block diagram illustrating a schematic configuration of the output sound generation device according to Example 4 of the fourteenth embodiment. FIG. 42A is a block diagram illustrating a schematic configuration of the output sound generation device according to the fifteenth embodiment. FIG. 42B is a block diagram illustrating a schematic configuration of the output sound generation device according to the application example 1 of the fifteenth embodiment. FIG. 42C is a block diagram illustrating a schematic configuration of the output sound generation device according to the application example 2 of the fifteenth embodiment. FIG. 43 is a diagram illustrating the frequency spectrum of the bass sound in the seventeenth embodiment. FIG. 44 is a block diagram illustrating a schematic configuration of the output sound generation device according to the seventeenth embodiment.

  An output sound generation device according to an embodiment of the present invention is an output sound generation device that generates an output sound for controlling the body, and generates a sound to be modulated based on a base sound that is a base of the output sound. A sound that is included in the output sound, and is a modulated sound in which at least one of the volume, pitch, and tone of the sound indicated by the sound information is periodically changed, or A modulated sound generating unit that generates a modulated sound in which the sound indicated by the sound information is periodically continued (first configuration).

  According to the first configuration, the sound information indicating the sound to be modulated is acquired from the bass sound, and the modulated sound is generated based on the sound indicated by the sound information. The modulated sound is a sound obtained by periodically changing at least one of the volume, pitch, and tone color of the sound indicated by the sound information, or a sound obtained by periodically repeating the sound indicated by the sound information. Therefore, even a sound that can be heard as noise with only the base sound is less likely to be annoying due to the modulated sound, and uncomfortable feeling can be reduced.

  In the first configuration, the bass sound is music, the acquisition unit acquires the music key as the sound information, and the modulated sound generation unit includes the first sound of the acquired music key. Alternatively, any one of the third sound and the fifth sound may be extracted, and the modulated sound may be generated based on the extracted sound (second configuration).

  According to the second configuration, any one of the first sound, the third sound, and the fifth sound of the bass music key is extracted to generate the modulated sound. Since the modulated sound is generated based on a sound that is unlikely to be unnatural with respect to the music of the bass sound, it is difficult to hear as a disturbing sound.

  In the second configuration, the modulated sound generation unit may generate, as the modulated sound, a sound obtained by performing amplitude modulation on the extracted sound at the predetermined frequency (third configuration).

  According to the third configuration, the electroencephalogram can be induced to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In the second configuration, the modulated sound generation unit may generate a sound obtained by frequency-modulating the extracted sound at the predetermined frequency as the modulated sound (fourth configuration).

  According to the fourth configuration, the electroencephalogram can be induced to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In the second configuration, the modulated sound generation unit may generate, as the modulated sound, a sound in which a sound having the same pitch as the extracted sound continues in a predetermined cycle (fifth configuration).

  According to the fifth configuration, the electroencephalogram can be induced to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In the second configuration, the modulated sound generation unit may generate two sounds having a predetermined frequency difference as the modulated sound based on the extracted sound (sixth configuration).

  According to the sixth configuration, since two modulated sounds having a frequency difference of a predetermined frequency are generated based on the extracted sound, it is possible to generate an output sound that is difficult to hear as an annoying sound.

  In any one of the third to sixth configurations, the modulated sound generation unit may generate a key of the key acquired by the acquisition unit in order to generate the modulated sound when the acquired music key is a major key. In addition to the first sound, the third sound, and the fifth sound, one sound may be extracted from the second sound and the sixth sound (seventh configuration).

  According to the seventh configuration, when the key of the bass music is a major key as the sound for generating the modulated sound, the second sound is added to the first sound, the third sound, and the fifth sound of the key. Since one sound is extracted from the sound and the sixth sound, one sound can be extracted from a wider range of candidates.

  In any one of the third to sixth configurations, the modulated sound generation unit may generate a key of the key acquired by the acquisition unit to generate the modulated sound when the acquired music key is a minor key. In addition to the first sound, the third sound, and the fifth sound, one sound may be extracted from the fourth sound and the seventh sound (eighth configuration).

  According to the eighth configuration, in the case where the key of the bass music is a minor key as the sound for generating the modulated sound, the fourth sound is added to the first sound, the third sound, and the fifth sound of the key. Since one sound is extracted from the sound and the seventh sound, one sound can be extracted from a wider range of candidates.

  In any one of the sixth to eighth configurations, the modulated sound generation unit, as a sound to be extracted to generate the modulated sound, has a difference between a frequency of the sound and a frequency of a sound that is a semitone below the sound. It is good also as extracting the sound whose half frequency is larger than the said predetermined frequency (9th structure).

  According to the ninth configuration, two sounds that can be heard with the same pitch can be used as the modulated sound, so that it is possible to output a sound with no sense of incongruity. Also, by using two sounds that can be heard as the same pitch as the modulated sound, two added sounds can be output as binaural beats.

  In any one of the sixth to ninth configurations, an adder that generates two output sounds by adding the base sound to each of the two modulated sounds, and two speakers corresponding to the left and right ears And an output unit that outputs the output sound, wherein one speaker of the two speakers outputs one output sound of the two output sounds generated by the adding unit. The other speaker may output the other output sound of the two output sounds generated by the adding unit (tenth configuration).

  According to the tenth configuration, the base sound is added to each of the two modulated sounds whose frequency difference is a predetermined frequency to generate two output sounds, and the two output sounds are output from the two speakers. In other words, by outputting a so-called binaural beat, the brain wave can be induced to a predetermined frequency, and thus the body can be controlled.

  In any of the sixth to ninth configurations, an adder that generates an output sound by adding the two modulated sounds, a speaker that outputs the output sound, and a speaker that outputs the bass sound It is good also as providing an output part (11th structure).

  According to the eleventh configuration, since the output sound obtained by adding the two modulated sounds and the bass sound are output separately, the user can hear a sound in which the base sound and the modulated sound are synthesized after the output. Therefore, the synthesized sound to be output can be adjusted by the user finely adjusting the position and angle of each speaker.

  Any one of the third to ninth configurations may further include three output units for outputting the two modulated sounds and the bass sound (twelfth configuration).

  According to the twelfth configuration, there is no need for an adding unit that adds the modulated sound and the bass sound or adds the two modulated sounds. Therefore, the output sound generation device can be realized with a simple configuration as compared with the case where the addition unit is provided. Further, since the two modulated sounds and the bass sound are output separately, a sound obtained by synthesizing the base sound and the two modulated sounds can be heard after the output. Therefore, the synthesized sound to be output can be adjusted by the user finely adjusting the position and angle of each output unit.

  In any one of the third to ninth configurations, an addition unit that adds one of the two modulated sounds and the bass sound, and an output unit that outputs the output sound are further included, and the output unit includes: A speaker that outputs a sound obtained by addition of the adding unit and the other modulated sound of the two modulated sounds may be provided as an output sound (a thirteenth configuration).

  According to the thirteenth configuration, a sound obtained by adding one of the two modulated sounds and the bass sound and the other modulated sound are output from separate speakers. For this reason, a sound obtained by adding the base sound and one of the modulation sounds and the other modulation sound after the output can be heard. Therefore, the synthesized sound to be output can be adjusted by the user finely adjusting the position and angle of each speaker.

  In any one of the second to thirteenth configurations, a sound collecting unit that collects the bass sound is further provided, and the obtaining unit obtains the key of the bass sound collected by the sound collecting unit. It is also possible (fourteenth configuration).

  According to the 14th structure, the modulation | alteration sound suitable for the music which flows around a user can be produced | generated.

  In the first configuration, the acquisition unit acquires, as the sound information, a reference pitch serving as a reference for the bass sound based on a frequency spectrum of the bass sound, and the modulated sound includes the reference pitch and a predetermined pitch. The sound may have a difference (fifteenth configuration).

  According to the fifteenth configuration, the modulated sound has a predetermined pitch difference from the pitch that serves as the reference for the bass sound, and thus is harmonized with the bass sound and is less likely to be annoying. Also, there is no need to listen in stereo like binaural beats.

  In the fifteenth configuration, the modulated sound generating unit is configured to generate only a predetermined frequency with respect to a frequency corresponding to the reference pitch so that a monaural beat is formed when the bass sound and the modulated sound are overlapped. A shifted sound may be generated as the modulated sound (sixteenth configuration).

  According to the sixteenth configuration, since the monaural beat is formed by the bass sound and the modulated sound, the brain wave can be guided to a predetermined frequency.

  In the fifteenth configuration, the predetermined pitch difference may be any one of a short third, a long third, a fourth, a fifth, a short 6 °, and a long 6 ° (seventeenth configuration). .

  According to the seventeenth configuration, a modulated sound that cooperates with the base sound can be generated, and therefore the user's brain wave can be guided to a predetermined frequency without giving the user unpleasant feeling.

  In the fifteenth configuration, the predetermined pitch difference is a pitch difference that forms a chord with a sound of the reference pitch, and the modulated sound generator generates at least two modulations that make up the sound of the reference pitch and the chord Sound may be generated (eighteenth configuration).

  According to the eighteenth configuration, since the two modulated sounds that form the base sound and the chord are generated, the user's brain wave can be guided to a predetermined frequency without giving the user discomfort.

  In the fifteenth configuration, the modulated sound generation unit may generate a sound that has the same timbre as the bass sound and is modulated at a predetermined frequency with respect to the sound of the reference pitch as the modulated sound. (Nineteenth configuration).

  According to the nineteenth configuration, the modulated sound has the same timbre as the bass sound, and the bass sound and the volume are different. Therefore, the modulated sound is less likely to be annoying to the base sound, and the brain wave can be guided to a predetermined frequency.

  In the fifteenth configuration, the modulated sound generation unit may generate a sound having the same frequency spectrum as the reference pitch and having a pitch different from that of the base sound as the modulated sound (twentieth configuration). .

  According to the twentieth configuration, the modulated sound has the same timbre as the bass sound, and the bass sound and the pitch are different. Therefore, the modulated sound is a harmonized sound with no sense of incongruity with respect to the bass sound, and it is easy to induce brain waves.

  In the fifteenth configuration, the modulated sound generation unit may generate, as the modulated sound, a sound that is amplitude-modulated at a predetermined frequency with respect to the sound of the reference pitch (a twenty-first configuration).

  According to the twenty-first configuration, the electroencephalogram can be induced to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In the fifteenth configuration, the modulated sound generation unit may generate, as the modulated sound, a sound obtained by frequency-modulating a sound having the reference pitch with a predetermined frequency (a twenty-second configuration).

  According to the twenty-second configuration, the electroencephalogram can be induced to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In the fifteenth configuration, the modulated sound generation unit may generate, as the modulated sound, a sound in which a sound having the reference pitch is continued at a predetermined period (a twenty-third configuration).

  According to the 23rd structure, an electroencephalogram can be induced | guided | derived to a predetermined frequency. Also, since the output sound is not a binaural beat, there is no need to listen in stereo.

  In any one of the fifteenth to twenty-third configurations, the acquisition unit may acquire a pitch based on a peak frequency in the frequency spectrum of the bass sound as the reference pitch (a twenty-fourth configuration).

  According to the twenty-fourth configuration, the modulated sound is generated on the basis of the pitch corresponding to the peak frequency of the spectrum structure of the bass sound, so that it is difficult for the sound to be harsh.

  In any one of the fifteenth to twenty-fourth configurations, the bass sound is an environmental sound, further includes a sound collecting unit that collects the environmental sound, and the acquisition unit is configured to collect the sound collected by the sound collecting unit. The reference pitch may be acquired based on the frequency spectrum of the environmental sound (25th configuration).

  According to the 25th structure, the modulation | alteration sound suitable for the environmental sound which flows around a user can be produced | generated.

  In any one of the eleventh to twenty-fifth configurations, an adding unit that adds the modulated sound and the bass sound to generate the output sound, and an output unit that outputs the output sound generated by the adding unit , May be further provided (26th configuration).

  According to the twenty-sixth configuration, the output sound is a sound obtained by adding the modulation sound generated based on the reference pitch of the base sound and the base sound, and thus is difficult to be annoying.

  In any one of the eleventh to twenty-fifth configurations, an output unit including a speaker that outputs the bass sound and a speaker that outputs the modulated sound may be further provided (a twenty-seventh configuration).

  According to the twenty-seventh configuration, since the bass sound and the modulated sound are output from separate speakers, the user can change the position of the speaker and the angle of the beat so that the beat sound formed by the bass sound and the modulated sound is fine. Adjustments can be made.

  In the second configuration, the modulated sound generation unit generates two modulated sounds having different sound image localizations by performing amplitude modulation on the same two sounds as the extracted sound at the predetermined frequency, respectively. It is good also as doing (28th structure).

  According to the twenty-eighth configuration, the electroencephalogram is guided to a predetermined frequency, and thereby the body can be controlled.

  In the fifteenth configuration, the modulated sound generation unit generates two modulated sounds having different sound image localizations by performing amplitude modulation on the same two sounds as the sound of the reference pitch at a predetermined frequency, respectively. It is good also as (29th structure).

  According to the 29th structure, an electroencephalogram is induced | guided | derived to a predetermined frequency, and, thereby, a body can be controlled.

  In the twenty-eighth or the twenty-ninth configuration, an output unit including two speakers corresponding to left and right ears is further provided, and one speaker of the two speakers modulates one of the two modulated sounds. Sound may be output, and the other speaker may output the other modulated sound (30th configuration).

  According to the 30th structure, an electroencephalogram can be guide | induced to a predetermined | prescribed frequency and, thereby, a body can be controlled.

  In any of the first to thirtieth configurations, the modulated sound may be a sound having a single frequency component (a thirty-first configuration).

  According to the thirty-first configuration, since the harmonic component is not included in the modulated sound, it is possible to effectively induce an electroencephalogram or the like to a predetermined frequency.

  In any one of the first to thirty-first configurations, the modulated sound generation unit includes at least one of a volume of the generated modulated sound, a frequency used when generating the modulated sound, and a frequency of the generated modulated sound itself. It is good also as changing one according to progress of time (32nd structure).

  According to the thirty-second configuration, in order to change at least one of the volume of the modulated sound, the frequency at which the modulated sound is generated, and the frequency of the generated modulated sound according to the passage of time, for example, the user's sleep time It is possible to output a modulated sound having a different volume or frequency depending on the sound. As a result, it is possible to effectively induce the user's brain wave with an appropriate modulated sound corresponding to the sleep state without disturbing the user's sleep.

  An output sound generation method according to an embodiment of the present invention is an output sound generation method for generating an output sound for controlling a body, wherein a sound to be modulated is generated based on a base sound that is a base of the output sound. A sound that is included in the output sound and is a sound that is included in the output sound, in which at least one of a volume, a pitch, and a tone color of the sound indicated by the sound information is periodically changed, or the sound information A modulated sound is generated by periodically repeating the sound indicated by.

  According to this method, sound information indicating the sound to be modulated is acquired from the bass sound, and the modulated sound is generated based on the sound indicated by the sound information. The modulated sound is a sound obtained by periodically changing at least one of the volume, pitch, and tone color of the sound indicated by the sound information, or a sound obtained by periodically repeating the sound indicated by the sound information. Therefore, even a sound that can be heard as noise with only the base sound is less likely to be annoying due to the modulated sound, and uncomfortable feeling can be reduced.

  A program according to an embodiment of the present invention provides sound information indicating a sound to be modulated based on a base sound that is a base of the output sound, to a computer of an output sound generating device that generates an output sound for controlling the body. A sound that is included in the output sound, and is a modulated sound in which at least one of a sound volume, a pitch, and a tone color indicated by the sound information is periodically changed, or the sound information is Generating a modulated sound in which the indicated sound is periodically continued.

  According to this program, sound information indicating the sound to be modulated is acquired from the bass sound, and a modulated sound is generated based on the sound indicated by the sound information. The modulated sound is a sound obtained by periodically changing at least one of the volume, pitch, and tone color of the sound indicated by the sound information, or a sound obtained by periodically repeating the sound indicated by the sound information. Therefore, even a sound that can be heard as noise with only the base sound is less likely to be annoying due to the modulated sound, and uncomfortable feeling can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated. In addition, in order to make the explanation easy to understand, in the drawings referred to below, the configuration is shown in a simplified or schematic manner, or some components are omitted. Further, the dimensional ratio between the constituent members shown in each drawing does not necessarily indicate an actual dimensional ratio.

[First Embodiment]
FIG. 1 is a block diagram illustrating a schematic configuration of the output sound generation device according to the first embodiment. The output sound generation device according to the first embodiment includes a key acquisition unit 1, an addition sound determination unit 2, an addition sound generation unit 3, a sound source 4, an addition unit 5, and an output unit 6. This output sound generation device generates output sounds for controlling the user's body, such as output sounds for guiding the user to a sleep state, output sounds for relaxing, and output sounds for awakening.

  The sound source 4 stores bass music that is the base of the output sound. The bass music can be any sound. However, it is preferable to use a sound according to the purpose of controlling the user's body. For example, for the purpose of guiding the user to sleep, healing music suitable for inviting sleep is used. The bass music stored in the sound source 4 is not limited to one type, and may be a plurality of types. When a plurality of types of bass music are stored in the sound source 4, the user may specify one bass music used for output from the output unit 6, or automatically determine one bass music. You may do it. As the base music stored in the sound source 4, music recorded on a CD, music downloaded via the Internet, or the like can be used.

  The key acquisition unit 1 acquires a key (key) of a bass music stored in the sound source 4 as sound information indicating a sound to be modulated in an additional sound generation unit 3 described later. When a plurality of types of bass music are stored in the sound source 4, the key of the bass music designated by the user or one bass music determined automatically is acquired.

  For example, when the bass music is stored in the sound source 4, information indicating the key of the bass music is also stored in advance. In this case, the key acquisition unit 1 acquires the key of the bass music based on the information indicating the key stored together with the bass music. As another method, the key acquisition unit 1 may acquire the key of the bass music by analyzing the frequency spectrum of the bass music.

  The added sound determination unit 2 determines a sound to be added to the bass music stored in the sound source 4 based on the key acquired by the key acquisition unit 1. A detailed method for determining the sound to be added will be described later.

  The added sound generation unit 3 generates a modulated sound obtained by modulating a sound determined from the bass music with a predetermined frequency. Specifically, the added sound generating unit 3 generates two sounds having the same frequency difference fa as the modulated sound, which are the same as the sounds determined by the added sound determining unit 2. In the present embodiment, the two modulated sounds are sounds to be added to the bass music, and are herein referred to as additive sounds. These two added sounds are sounds for guiding the brain waves to a predetermined frequency fa.

  FIG. 2 is a diagram summarizing the types, frequencies, and characteristics of electroencephalograms. When the type of electroencephalogram is a γ wave, the frequency is 26 to 70 Hz, and the user is in an excited state. When the type of electroencephalogram is β-wave, the frequency is 14 to 38 Hz, and the user is in a normal daily life state. When the type of electroencephalogram is an α wave, the frequency is 8 to 14 Hz, and the user is in a relaxed state. When the type of electroencephalogram is a θ wave, the frequency is 4 to 8 Hz, and the user is in a sleep state. When the type of electroencephalogram is a δ wave, the frequency is 0.5 to 4 Hz, and the user is in a deep sleep state.

  As shown in FIG. 2, the lower the electroencephalogram frequency, the quieter the body is. In particular, when the electroencephalogram is a θ wave or δ wave having a frequency of 8 Hz or less, it is in a sleep state, and in the case of a δ wave having a frequency of 4 Hz or less, it is a deep sleep state. For this reason, roughly, if the brain wave is guided to a lower frequency, it can be led to a deeper sleep state, and if the brain wave is guided to a higher frequency, it can be led to a shallower sleep state or awake state.

  The predetermined frequency fa is set to a target frequency for inducing brain waves. For example, when guiding the user to a sleep state, the predetermined frequency fa is set to a frequency of 8 Hz or less. At this time, a user's biological information (a user's body movement, a heart rate, a respiration rate, etc.) may be acquired, an electroencephalogram may be estimated, and the predetermined frequency fa may be set to a frequency lower than the estimated electroencephalogram. That is, as the sleep state becomes deeper, the frequency of the estimated electroencephalogram is gradually lowered, so that the predetermined frequency fa is set to be gradually lowered.

  By guiding the electroencephalogram to a predetermined frequency fa, the user can be led to a sleep state or can be led from a sleeping state or a out of state to an awake state according to the magnitude of the predetermined frequency fa. . In addition, the user can be relaxed by setting the predetermined frequency fa to 8 to 14 Hz corresponding to the state of the α wave of the brain wave.

  As described above, the additional sound generation unit 3 generates two additional sounds that are the same as the sound determined by the additional sound determination unit 2 and have a predetermined frequency difference fa. When the frequency of the sound determined by the addition sound determination unit 2 is fb, the addition sound generation unit 3 generates, for example, an addition sound having a frequency of fb and an addition sound having a frequency of fb-fa. However, the two added sounds to be generated are not limited to this combination, and may be an added sound having a frequency of fb and an added sound having a frequency of fb + fa, an added sound having a frequency of fb−fa / 2, and a frequency. May be an added sound of fb + fa / 2.

  The adder 5 adds the two added sounds generated by the added sound generator 3 and the bass music stored in the sound source 4. Specifically, two output sounds are generated by adding the base music stored in the sound source 4 to each of the two additional sounds generated by the additional sound generation unit 3.

  The output unit 6 is, for example, a speaker, and two output units 6 are provided corresponding to the left and right ears. One output unit 6 of the left and right output units 6 outputs one of the two output sounds generated by the addition unit 5, and the other output unit 6 outputs the two output sounds generated by the addition unit 5. The other of the output sounds is output.

  3 outputs one of the two output sounds generated by the adding unit 5 from one of the two output units 6, and is generated by the adding unit 5 from the other of the two output units 6. It is a block diagram which shows the structure which outputs the other of two performed output sounds. In FIG. 3, two adders 5 are shown for ease of explanation, but actually one may be used. However, as shown in FIG. 3, two addition units 5 may be provided.

  Such a sound output from the two output units 6 is known as a binaural beat. That is, the brain waves can be guided to the predetermined frequency fa by letting the left and right ears hear two sounds that differ by a predetermined frequency fa.

  Details of the method of determining the added sound by the added sound determining unit 2 will be described below.

In the simplest case, the chords constituting music can be classified into the following three types (1) to (3). In (1) to (3), I, IV, and V represent frequencies. These chords (1) to (3) are the most important chords, and it can be considered that other chords are formed by transforming these three chords.
(1) I: Tonic (2) IV: Subdominant (3) V: Dominant

In the case of the major key, the constituent sounds of the three chords (1) to (3) are represented by the following (1a) to (3a). However, in (1a) to (3a), the constituent sound of the key is represented by the frequency counted from the lowest sound.
(1a) I: 1, 3, 5
(2a) IV: 4, 6, 1
(3a) V: 5, 7, 2

In the case of the minor key, the constituent sounds of the three chords are represented by the following (1b) to (3b). However, in (1b) to (3b), the constituent sound of the key is represented by the frequency counted from the lowest sound.
(1b) Im: 1, ♭ 3, 5
(2b) IVm: 4, ♭ 6, 1
(3b) V: 5, 7, 2

The three chords are basic chords. These chords include sounds that do not become unnatural when added to each chord. In the case of the major key, the sound that does not become an unnatural sound even if added is shown in Table 1, and in the case of the minor key, the sound that does not become an unnatural sound even if added is shown in Table 2. These sounds are sometimes called tension notes.

  In Tables 1 and 2, there is a theory that “1” in the chord of V cannot be added. However, “1” is the most important sound of the key, and is often used simultaneously with the chord of V, so it is listed here as a sound that can be added.

From Tables 1 and 2, in the case of each of the major key and minor key, the sounds that do not become unnatural sound when added to any of the three chords are as follows.
・ Measure key: 1, 3, 5, 2, 6
・ For minor keys: 1, ♭ 3, 5, 4, ♭ 7

  Since these sounds are common to the three chords that form the basis of music, even if they are constantly added while the chords of the music are changing, the sounds are less uncomfortable. In particular, the first sound, third sound, and fifth sound of the key are included in both the major key and the minor key.

  For this reason, in this embodiment, the addition sound determination unit 2 determines any one of the first sound, the third sound, and the fifth sound of the key acquired by the key acquisition unit 1 as the addition sound. . The added sound is a substantially continuous sound that is a constant sound with little change in time.

  In particular, when the key acquired by the key acquisition unit 1 is a major key, the addition sound determination unit 2 adds the second sound and the sixth sound in addition to the first sound, the third sound, and the fifth sound of the key. One of the sounds is determined as the added sound. In addition, when the key acquired by the key acquisition unit 1 is a minor key, the addition sound determination unit 2 adds the fourth sound and the seventh sound in addition to the first sound, the third sound, and the fifth sound of the key. One of the sounds is determined as the added sound.

  In order to make the sound after the addition more comfortable, it is preferable that the added sound is the first sound of the key acquired by the key acquisition unit 1. The preferred sound after the first sound is the fifth sound, and the preferred sound after the fifth sound is the third sound.

  For a certain major key, a minor key that starts with a sound that is a third lower than the fundamental tone is called a parallel tone and consists of exactly the same sound. In this parallel tone, the first sound, the third sound, the fifth sound, the second sound, and the sixth sound of the major key, and the first sound, the third sound, the fifth sound, the fourth sound, and the minor key, The seventh sound is the same sound.

For example, both C major and A minor are composed of sounds of “do, les, mi, fa, so, la, shi”. In the case of the C major key, the sounds that can be added are the first sound, third sound, fifth sound, second sound, and sixth sound, which are de, mi, seo, les, and la. In the case of a key, it becomes “La”, “Do”, “Mi”, “Le” and “So”, and the same sound is obtained. Table 3 is a table showing three chords and their constituent sounds in the case of the C major key, and a sound that does not become an unnatural sound even if it is added. Table 4 shows three chords in the case of the A minor key. It is a table | surface which shows the sound which does not become an unnatural sound even if it adds a chord and its component sound.

  FIG. 4 is a diagram showing a pitch name, a frequency of the sound, and a frequency difference between the sound and a semitone lower sound. As shown in FIG. 4, the frequency of the reference A4 sound is 440 Hz.

  Since the human audible range is 20 Hz or higher, the sound that can be used as the added sound is E0 or higher. When the user hears a binaural beat, the phase of the sound is maintained to some extent even in the brain, causing interference in the brain, so that an electroencephalogram is induced to a predetermined frequency. For this reason, if the frequency of the sound is too high, the phase information is not maintained in the brain, and the brain wave cannot be guided to a predetermined frequency. Here, the upper limit frequency of the sound used as the binaural beat is 1000 Hz. That is, the sound that can be used as the added sound is B5 or less.

  Here, in order for the added sound to function as a binaural beat, sounds input to the left and right ears need to be recognized as the same pitch. As shown in FIG. 4, the lower the frequency, the smaller the frequency difference from the sound below the semitone. Two sounds with different semitones are not recognized as the same sound, but if the frequency difference between the two sounds is in the range of about half of the frequency difference between the semitones, they will be heard in the same pitch. For example, a C5 sound having a frequency of 523.3 Hz has a frequency difference of approximately 29.37 Hz with respect to a sound below a semitone, and therefore, a sound having a frequency difference within approximately 14.7 Hz with respect to the C5 sound and the C5 sound. Sounds the same pitch. In this case, if the predetermined frequency fa is within 14.7 Hz, the C5 sound can be used as the additional sound, but if the predetermined frequency fa is higher than 14.7 Hz, the C5 sound is used as the additional sound. Can not do it.

  That is, the addition sound determination unit 2 has a frequency that is 20 Hz or more and 1000 Hz or less as the addition sound, and a frequency that is half the difference between the frequency of the sound and the frequency of the sound that is a semitone below the sound is predetermined. The sound is determined to be larger than the frequency fa. The sound that can be used as the addition sound can be determined according to the type of key. Hereinafter, a sound that can be used as an additional sound according to the type of key acquired by the key acquisition unit 1 will be described.

<When the key is C major>
When the key is C major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the C major key are C, E, G, D, and A.

  When the key is C major, the sounds that can be used as the additional sound are as shown in FIG. FIG. 5 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

  As described above, the upper limit value of the frequency difference for the sound that can be used as the added sound is about half of the frequency difference between the sound and the sound that is lower than the semitone. For example, when a binaural beat having a predetermined frequency fa of 5 Hz is generated, the usable added sound needs to be a sound whose upper limit of the frequency difference is larger than 5 Hz. Therefore, referring to FIG. 4, G3, A3, C4 , D4, E4, G4, A4, C5, D5, E5, G5, A5.

<When the key is C # major>
When the key is C # major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound whose frequency is 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, second sound, and sixth sound of the C # major key are C #, F, G #, D #, and A #.

  When the key is C # major, the sounds that can be used as the added sound are as shown in FIG. FIG. 6 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is D major>
When the key is D major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, the third sound, the fifth sound, the second sound, and the sixth sound of the D major key are D, F #, A, E, and B.

  When the key is D major, the sounds that can be used as the added sound are as shown in FIG. FIG. 7 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is D # major>
When the key is D # major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, second sound, and sixth sound of the D # major key are D #, G, A #, F, and C.

  When the key is D # major, the sounds that can be used as the added sound are as shown in FIG. FIG. 8 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is E major>
When the key is E major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the E major key are E, G #, B, F #, and C #.

  When the key is E major, the sounds that can be used as the addition sound are as shown in FIG. FIG. 9 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is F major>
When the key is F major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, second sound, and sixth sound of the F major key are F, A, C, G, and D.

  When the key is F major, the sounds that can be used as the addition sound are as shown in FIG. FIG. 10 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is F # major>
When the key is F # major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound whose frequency is 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, second sound, and sixth sound of the F # major key are F #, A #, C #, G #, and D #.

  When the key is F # major, the sounds that can be used as the addition sound are as shown in FIG. FIG. 11 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is G major>
When the key is the G major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the G major key are G, B, D, A, and E.

  When the key is G major, the sounds that can be used as the added sound are as shown in FIG. FIG. 12 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is G # major>
When the key is G # major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the G # major key are G #, C, D #, A #, and F.

  When the key is G # major, the sounds that can be used as the addition sound are as shown in FIG. FIG. 13 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is A major>
When the key is A major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the A major key are A, C #, E, B, and F #.

  When the key is A major, the sounds that can be used as the added sound are as shown in FIG. FIG. 14 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is A # major>
When the key is A # major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the A # major key are A #, D, F, C, and G.

  When the key is A # major, the sounds that can be used as the additional sound are as shown in FIG. FIG. 15 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is B major>
When the key is B major, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the second sound, and the sixth sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, second, and sixth sounds of the B major key are B, D #, F #, C #, and G #.

  When the key is B major, the sounds that can be used as the added sound are as shown in FIG. FIG. 16 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is C minor>
When the key is C minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound that have a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the C minor key are C, D #, G, F, and A #.

  When the key is C minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 17 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is C # minor>
When the key is C # minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the C # minor key are C #, E, G #, F #, and B.

  When the key is C # minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 18 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is D minor>
When the key is D minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound whose frequency is 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, fourth sound, and seventh sound of the D minor key are D, F, A, G, and C.

  When the key is D minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 19 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is D # minor>
When the key is D # minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, fourth sound, and seventh sound of the D # minor key are D #, F #, A #, G #, and C #.

  When the key is D # minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 20 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is E minor>
When the key is E minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, third sound, fifth sound, fourth sound, and seventh sound of the E minor key are E, G, B, A, and D.

  When the key is E minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 21 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is F minor>
When the key is F minor, the sounds that can be used as the additional sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound having a frequency of 20 Hz or more and 1000 Hz or less. The first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound of the F minor key are F, G #, C, A #, and D #.

  When the key is F minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 22 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is F # minor>
When the key is F # minor, the sounds that can be used as the added sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the F # minor key are F #, A, C #, B, and E.

  When the key is F # minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 23 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is G minor>
When the key is G minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the G minor key are G, A #, D, C, and F.

  When the key is the G minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 24 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is G # minor>
When the key is G # minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound whose frequency is 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the G # minor key are G #, B, D #, C #, and F #.

  When the key is G # minor, the sounds that can be used as the addition sound are as shown in FIG. FIG. 25 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is A minor>
When the key is A minor, the sounds that can be used as the addition sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound that have a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the A minor key are A, C, E, D, and G.

  When the key is A minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 26 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is A # minor>
When the key is A # minor, the sounds that can be used as the added sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound having a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the A # minor key are A #, C #, F, D #, and G #.

  When the key is A # minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 27 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

<When the key is B minor>
When the key is B minor, the sounds that can be used as the added sound are the first sound, the third sound, the fifth sound, the fourth sound, and the seventh sound that have a frequency of 20 Hz or more and 1000 Hz or less. The first, third, fifth, fourth, and seventh sounds of the B minor key are B, D, F #, E, and A.

  When the key is B minor, the sounds that can be used as the additional sound are as shown in FIG. FIG. 28 also shows the upper limit value of the frequency difference for the sound that can be used as the added sound.

  According to the output sound generation device of this embodiment, any sound can be used as the base music that is the base of the output sound for controlling the body as long as the key can be acquired, and the output sound is harsh. It is possible to generate a sound that is difficult to sound. Thereby, for example, when the user is guided to a sleep state by the output sound generation device, the user can use favorite music as the base music.

  In addition, for example, in order to guide the user to a deep sleep state, it is preferable to gradually decrease the predetermined frequency fa according to the user's sleep state (electroencephalogram state). In this case, it is necessary to generate an output sound corresponding to the user's sleep state a plurality of times until the user enters a deep sleep state. However, according to the output sound generation device of the present embodiment, it is jarring each time. It is possible to generate a sound that does not easily become a special sound. This is a great advantage compared to a method in which an output sound that does not easily become harsh is created in advance and the output sound is output.

[Second Embodiment]
The output sound generation device in the second embodiment is different from the output sound generation device in the first embodiment in the processing performed by the adding unit 5 and the output unit 6.

  In the output sound generation device according to the second embodiment, the addition unit 5 adds the two addition sounds generated by the addition sound generation unit 3 and the bass music stored in the sound source 4. Specifically, the two additional sounds generated by the additional sound generating unit 3 are added, and the bass music stored in the sound source 4 is added to the sound obtained by the addition.

  The output unit 6 outputs the output sound generated by the adding unit 5. In this case, since the output sound is monaural, there is no need for two output units 6 and one output unit 6 may be used. When two output units 6 are provided, the same output sound is output from the two output units 6.

  As in the present embodiment, even when two added sounds having different frequencies by a predetermined frequency fa are added and further added to the bass music stored in the sound source 4, the brain waves are guided to the predetermined frequency fa. can do.

  In addition, when adding two addition sounds produced | generated by the addition sound production | generation part 3, it can also add by arbitrary ratios, without adding by the ratio of 1: 1.

[Third Embodiment]
A general sound contains various frequency components. In particular, a sound having a pitch includes a harmonic component whose frequency is doubled, tripled, quadrupled, or the like with respect to a reference fundamental tone. When a binaural beat is generated using such a sound, with respect to the harmonic component, the frequency difference between the two added sounds to be generated becomes twice, three times, four times, or the like of the predetermined frequency fa. For this reason, when the overtone component is included in the added sound, there is a possibility that the effect of inducing the brain wave to the predetermined frequency fa by listening to the left and right ears of the binaural beat may be reduced.

  Therefore, in this embodiment, a sound having a single frequency component is used as the added sound. The sound having a single frequency component is, for example, a sound whose time waveform is a sine wave (see FIG. 29). Thereby, an electroencephalogram can be effectively induced to a predetermined frequency fa.

  When generating a binaural beat, two added sounds having a frequency difference of a predetermined frequency fa are generated. However, only one of the two added sounds has a single frequency component. Also good.

[Fourth Embodiment]
In the first to third embodiments described above, based on the key extracted from the bass music, two modulated sounds (added sounds) having a predetermined frequency difference are generated, and the generated modulated sound and the bass music are generated. The example which adds is demonstrated. In the present embodiment, an example in which modulated sound is generated by performing modulation different from that of the above-described embodiment will be described.

<Example 1>
FIG. 30 is a block diagram illustrating a schematic configuration of the output sound generation device according to the present embodiment. In FIG. 30, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment. The output sound generation apparatus in the present embodiment includes a key acquisition unit 1, a sound determination unit 21, a modulated sound generation unit 31, and output units 61A and 61B.

  The sound determination unit 21 determines a sound for modulating the bass music based on the key acquired by the key acquisition unit 1 by the same method as the addition sound determination unit 2 of the first embodiment described above.

  The modulated sound generation unit 31 generates a modulated sound obtained by modulating the sound determined by the sound determination unit 21 with a predetermined frequency. Specifically, for example, the determined sound is multiplied by (a × sin 2πfc × t + (1−a)) [0 <a <1/2, t: time]. As a result, a modulated sound is generated by performing amplitude modulation on the determined sound at the frequency fc.

  The output units 61A and 61B each include a speaker. The output unit 61A outputs the bass music stored in the sound source 4, and the other output unit 61B outputs the modulated sound generated by the modulated sound generating unit 31.

  Human brain waves have the property of synchronizing with periodic fluctuations. A user's brain wave can be induced and a psychological state can be controlled by a beat formed by outputting a modulated sound obtained by amplitude-modulating a sound extracted from bass music with a predetermined frequency and a base sound. Binaural beats need to be heard in stereo, but in the case of the modulated sound of this configuration, there is no need to listen in stereo.

<Example 2>
In the above example 1, the modulation sound generation unit 31 has been described as an example in which the modulation sound is generated by amplitude-modulating the sound determined by the sound determination unit 21, but the modulation sound is generated by frequency modulation at a predetermined frequency. May be.

  In this case, for example, the modulated sound generation unit 31 shifts the frequency of the determined sound by (a × sin 2πfd × t) [0 <a <1/2, t: time], thereby generating a frequency at the frequency fd. A modulated sound is generated.

  In this way, the user's brain wave can be induced and the psychological state can be controlled by the beat formed by outputting the modulated sound obtained by modulating the sound extracted from the bass music with a predetermined frequency and the base sound. . Binaural beats need to be heard in stereo, but in the case of the modulated sound of this configuration, there is no need to listen in stereo.

<Example 3>
The modulated sound generation unit 31 may generate a modulated sound in which the sound image localization of the sound determined by the sound determination unit 21 is periodically changed.

  In this case, the output unit 61B includes two speakers corresponding to the left and right ears. The modulated sound generation unit 31 assigns the same sound as the determined sound to the two left and right speakers. Then, one sound is multiplied by (a × sin 2πfe × t + (1−a)), and the other sound is multiplied by (−a × sin 2πfe × t + (1−a)). In other words, in this example, modulated sounds having different sound image localizations are generated by performing amplitude modulation at the frequency fd on the same two sounds as the determined sounds. By comprising in this way, a user's brain wave can be guide | induced to the frequency fe and a psychological state can be controlled.

[Fifth Embodiment]
The frequency for inducing the user's brain wave is about 20 Hz or less, and the sound is such that it falls below the audible range. In the above-described fourth embodiment, a modulated sound obtained by modulating an existing sound is output, thereby causing the brain wave to perceive the frequency of the modulated sound. For example, the same effect as in the fourth embodiment can be expected even when a decaying sound that causes the guitar sound to decay and disappear when the guitar is played is continuously played at a predetermined frequency.

  In the present embodiment, a sound that is determined by the sound determination unit 21 in the modulation sound generation unit 31 in order to generate a modulation sound corresponding to an attenuation sound, and is a sound in which a short sound is continued at a predetermined period. Is generated as a modulated sound. That is, for example, when the sound determination unit 21 determines the sound “mi” and the frequency perceived by the user's brain wave is 2 Hz, the sound “mi” is continuously generated at a pace of 2 times per second. The generated sound is generated as a modulated sound.

  With this configuration, the user's brain wave can perceive the frequency of the modulated sound, and the user's brain wave can be induced.

[Sixth Embodiment]
Parameters such as the volume of the modulated sound exemplified in the fourth and fifth embodiments described above, the frequency for generating the modulated sound, and the frequency of the generated modulated sound itself are changed according to the user's sleep state and output. Also good.

  The modulated sound is output for the purpose of inducing a user's brain wave during sleep, for example. Since the sleep state changes with time, it is preferable that the modulation sound also changes with sleep time. Therefore, in this embodiment, for example, a modulated sound having a volume corresponding to time is generated so that the volume decreases as the user's sleep time elapses. In this case, the modulated sound generation unit 31 includes a timer. The modulated sound generator 31 generates a modulated sound with a predetermined volume for each time according to the time measured by the timer.

  Moreover, the frequency of the modulated sound to be generated may be changed as the user's sleep time elapses, and the modulated sound having a different frequency may be output according to the time. In this case, the modulated sound generator 31 generates a modulated sound at a frequency predetermined for each time according to the time measured by the timer.

  By comprising in this way, the modulation | alteration sound suitable for a user's sleep state can be output, and the brain wave at the time of a user's sleep can be induced | guided | derived more effectively.

  Note that the sleep time measured by the timer may not be the sleep time of the user who hears the modulated sound. For example, when a plurality of people are sleeping side by side, a modulated sound having a volume corresponding to the sleep time of a person other than the user who should hear the modulated sound may be output. By doing so, it is possible to prevent other people's sleep from being disturbed by the output of the modulated sound.

[Seventh Embodiment]
In the second embodiment described above, the two additional sounds generated by the additional sound generation unit 3 are added, and the bass music stored in the sound source 4 is added to the sound obtained by the addition, and output. In the present embodiment, a sound obtained by adding two added sounds and a bass music are output from separate speakers.

  In this case, as shown in FIG. 31, the output sound generation device according to the present embodiment includes two output units 6A and 6B each having one speaker. The output unit 6A outputs the bass music stored in the sound source 4, and the output unit 6B outputs the sound added by the adding unit 5.

  Since the added sound is often a monotone sound, the load of the adding process in the adding unit 5 can be reduced by configuring in this way. For this reason, the processing performance of the adding unit 5 does not need to be higher than that of the second embodiment. Further, since the base music and the sound obtained by adding the two additional sounds are output from the output units 6A and 6B, the user can hear the sound obtained by synthesizing the base music and the additional sound after the output. Therefore, the user can adjust the output synthesized sound by finely adjusting the position and angle of each speaker of the output units 6A and 6B.

[Eighth Embodiment]
In the first embodiment described above, the adder 5 adds each of the two added sounds generated by the added sound generator 3 and the bass music stored in the sound source 4 to generate two output sounds. Generated and output two output sounds from each of the two speakers provided in the output unit 6. In the present embodiment, an example in which the adding unit 5 is not provided will be described.

  Specifically, as shown in FIG. 32, the output sound generation device according to the present embodiment is not provided with an adding unit, and includes three output units 6A to 6C each having one speaker.

  The output unit 6A outputs the bass music stored in the sound source 4. The output unit 6B outputs one added sound 1 of the two added sounds 1 and 2 added by the added sound generating unit 3, and the output unit 6C outputs the other added sound 2.

  According to this configuration, since the addition unit is not provided, the output sound generation device can be realized with a simple configuration as compared with the first embodiment. In addition, since the user can finely adjust the position and angle of each speaker of the output units 6B and 6C, it is possible to adjust the generation of beats due to the superposition of the added sound 1 and the added sound 2. That is, a binaural beat and a monaural beat can be selectively generated according to the arrangement of the output units 6B and 6C.

  In the above description, the output units 6B and 6C are provided with speakers and output modulated sound from the speakers. However, for example, mechanical sound such as fan sound may be output as modulated sound. That is, the output unit is not limited to a speaker.

[Ninth Embodiment]
In the first embodiment described above, the adding unit 5 adds one added sound generated by the added sound generating unit 3 and the bass music stored in the sound source 4, and the other added sound is the bass music. You may output without adding.

  Specifically, as shown in FIG. 33, the output sound generating device in the present embodiment adds one added sound 1 and the bass music stored in the sound source 4 in the adder 53 and adds the other. Sound 2 is not added to the bass music. The output sound generation device in this embodiment includes two output units 6A and 6B each having one speaker. The output unit 6A outputs a sound obtained by adding the addition sound 1 and the bass music by the addition unit 53, and the output unit 6B outputs only the addition sound 2.

  With this configuration, the user can finely adjust the position and angle of each speaker of the output units 6A and 6B. Therefore, it is possible to adjust the generation of beats due to the superposition of the added sound 1 and the added sound 2. it can. That is, a binaural beat and a monaural beat can be selectively generated according to the arrangement of the output units 6A and 6B.

[Tenth embodiment]
In the second embodiment described above, for example, when the sound source 4 is an environmental sound emitted outside the output sound generation device, the output sound generation device may be configured as shown in FIG.

  Specifically, as shown in FIG. 34, the output sound generation device includes a sound receiving unit 7 having a microphone that collects the sound of the sound source 4, and the key acquisition unit 1 collects sound by the sound receiving unit 7. Key from key. The adding unit 5 adds the two added sounds generated by the added sound generating unit 3. The output unit 6 outputs the sound added by the adding unit 5. The environmental sound may be a natural sound or music, and may be a sound having a peak frequency and a pitch.

  By comprising in this way, the addition sound in harmony with the sound source can be output with respect to the sound source outside the output sound generation device. As a result, it is possible to provide a sound with no sense of incongruity as the entire sound transmitted to the user.

[Eleventh embodiment]
In the first embodiment described above, an example has been described in which two modulated sounds differing by a predetermined frequency fa are heard as binaural beats based on a key acquired from bass music. In the present embodiment, for example, an example will be described in which a user's brain wave is induced by using an environmental sound including an operation sound of a machine such as a fan as a base sound and outputting a modulated sound in harmony with the base sound together with the base sound.

<Example 1>
FIG. 35 is a functional configuration diagram of the output sound generation device according to the present embodiment. As illustrated in FIG. 35, the output sound generation device 100 includes a sound source 101, a pitch acquisition unit 102, a sound determination unit 103, a modulated sound generation unit 104, and an output unit 105.

  The sound source 101 includes a microphone, collects a bass sound with the microphone, and outputs the collected sound to the pitch acquisition unit 102. The base sound is an environmental sound including, for example, operation sounds of a fan, a compressor, a motor, etc., combustion sounds of gas equipment, and the like.

  The pitch acquisition unit 102 analyzes the frequency spectrum of the bass sound collected by the sound source 101, and acquires a pitch as a reference for the bass sound based on the frequency spectrum. Specifically, the pitch acquisition unit 102 detects the peak frequency in the frequency spectrum and sets the pitch corresponding to the peak frequency as the pitch of the bass sound. In particular, sound generated by a fan, a compressor, a motor, or the like has a peak frequency due to the rotational speed of the rotating body. The spectrum composed of the peak frequency sound and its harmonics can be said to be a single sound spectrum.

  The sound determination unit 103 determines the pitch of the modulated sound output from the output unit 105 based on the pitch acquired by the pitch acquisition unit 102.

  The modulated sound generation unit 104 performs a predetermined modulation on the sound having the pitch determined by the sound determination unit 103 to generate a modulated sound. Specifically, for example, a modulated sound having a predetermined frequency difference from the frequency of the determined pitch is generated so that a monaural beat is formed when superimposed on the bass sound. That is, when the frequency of the determined pitch is f1, a sound having a frequency (f1 + Δf) slightly shifted from the frequency f1 is generated as a modulated sound.

  The output unit 105 includes at least one speaker. The output unit 105 outputs the modulated sound generated by the modulated sound generation unit 104 from the speaker.

  Only the operation sound of a fan or the like is heard as simple noise, but a monaural beat is formed by outputting a modulation sound having a predetermined frequency difference from the base sound extracted from the operation sound of a fan or the like. As a result, a sound obtained by superimposing the base sound and the modulated sound can be synchronized with the user's brain.

<Example 2>
The frequency difference between the modulated sound and the bass sound generated by the modulated sound generation unit 104 (see FIG. 35) may have a pitch relationship in which a chord is formed by the modulated sound and the bass sound. That is, it is only necessary to form a pitch difference that makes the bass sound and the modulated sound feel cooperative. Specifically, for example, the modulated sound generation unit 104 may select any one of the pitch determined by the sound determination unit 103 and the minor third, the major third, the fourth, the fifth, the minor 6th, and the major 6 °. A modulated sound having a pitch difference is generated. The modulated sound may be shifted in octave units with respect to the bass sound.

  With this configuration, even if the base sound alone is a noise that gives the user discomfort, the discomfort can be reduced by outputting a modulated sound that is integrated with the base sound.

<Example 3>
In Example 2 described above, a chord is formed by the bass sound and one modulation sound, but a chord may be formed by the base sound and at least two modulation sounds.

  For example, when the pitch acquired by the pitch acquisition unit 102 is “de”, the sound determination unit 103 determines the same “do” as the acquired pitch as the pitch of the modulated sound.

  The modulated sound generation unit 104 performs chord C (do, mi, so), chord ♭ A (♭ la, de, ♭ mi), chord F (fa, la) as a long triad including the determined pitch “do”. , DO), two modulated sounds are formed so that one of them is formed. That is, when the chord C long triad is formed, the modulated sound generating unit 104 generates two modulated sounds corresponding to “mi” and “so”, respectively. Also, when forming a long triad of chord A, the modulation sound generation unit 104 generates two modulation sounds corresponding to “相当” and “♭”. When a chord F long triad is formed, the modulated sound generation unit 104 generates two modulated sounds corresponding to “Fa” and “La”, respectively.

  The chord configuration is not limited to the above example. It may be a short triad or a four chord (seventh chord) composed of a root tone, a third tone, a fifth tone, and a seventh tone.

  By configuring in this way, even if the bass sound alone is heard as noise, it is possible to reduce the discomfort by outputting two modulated sounds that make up the tone and chord of the pitch specified from the bass sound. can do.

<Example 4>
The modulated sound may be a sound having the same tone color as that of the bass sound, that is, a sound having the same frequency spectrum as that of the bass sound.

  In this case, the sound determination unit 103 determines a sound having the same frequency spectrum as the pitch acquired by the pitch acquisition unit 102 as the pitch of the modulated sound. The modulated sound generation unit 104 modulates the amplitude of the pitch determined by the sound determination unit 103 in accordance with the amplitude of the base sound, and generates a modulated sound.

  That is, for example, as shown in FIG. 36A, when the volume (amplitude) of the base sound fluctuates, as shown in FIG. 36B, it has the same pitch as the base sound so as to cancel the fluctuation in the amplitude of the base sound. Adjust the amplitude of the modulated sound. Furthermore, as shown in FIG. 36C, amplitude modulation is performed on the modulated sound so that the amplitude of the modulated sound and the base sound fluctuates at a predetermined frequency.

  According to this configuration, the modulated sound can be output so that the amplitude obtained by superimposing the modulated sound on the operation sound (bass sound) fluctuates at a predetermined frequency, so that the user's brain wave can be guided to the predetermined frequency. .

<Example 5>
In Examples 1 to 3 of this embodiment, modulated sounds having a predetermined pitch difference from the pitch acquired from the base sound are generated, but these modulated sounds may be sounds having a single peak frequency. That is, in this case, the frequency spectrum of the modulated sound has one peak frequency as shown in FIG. That is, the time waveform of the modulated sound is a sine wave.

  When the modulated sound includes a plurality of overtones, when the bass sound and the modulated sound are superimposed, a beat occurs at an unintended frequency. Therefore, with this configuration, it is difficult for beats to occur at unintended frequencies. In addition, since the modulated sound has a single peak frequency, the degree of freedom of generation and modulation of the modulated sound is increased.

<Example 6>
The modulated sound may be a sound having the same tone color as the bass sound and a different pitch. In this case, the sound determination unit 103 (see FIG. 35) determines the same pitch as the pitch acquired by the pitch acquisition unit 102 as the pitch of the modulated sound. The modulated sound generation unit 104 generates a sound having the same frequency spectrum as the sound of the pitch determined by the sound determination unit 103, and performs a pitch shift process on the sound to generate a modulated sound. Specifically, for example, when the frequency spectrum of the bass sound has the spectrum structure shown in FIG. 38A, the modulated sound generation unit 104 changes only the pitch without changing the sound reproduction speed shown in FIG. 38A. A modulated sound having the frequency spectrum structure shown in 38B is generated. In this case, the spectrum of the modulated sound shown in FIG. 38B is reduced in the frequency direction from the spectrum of the bass sound shown in FIG. 38A, and the pitch of the modulated sound is lower than that of the base sound.

  A modulated sound having a frequency spectrum structure similar to that of the bass sound has a tone color equivalent to that of the bass sound. Therefore, when a chord is formed by the bass sound and the modulated sound, the sound becomes natural and easy to hear than when a modulated sound and a chord of different timbres are formed.

<Example 7>
The modulated sound may be a sound obtained by performing amplitude modulation at a predetermined frequency on a sound having a pitch acquired from the bass sound. In this case, in FIG. 35, the sound determination unit 103 determines the same pitch as the pitch acquired by the pitch acquisition unit 102 as the pitch of the modulated sound. The modulated sound generation unit 104 generates a sound obtained by performing amplitude modulation at a predetermined frequency fp on the sound having the pitch determined by the sound determination unit 103 as a modulated sound. Specifically, for example, the sound of the determined pitch is multiplied by (a × sin 2πfp × t + (1−a)) [0 <a <1/2, t: time].

  Since the electroencephalogram has the property of synchronizing with periodic fluctuations, it is considered that the electroencephalogram can be induced using this property. The modulated sound in this example is different in volume from the sound of the pitch that is the reference of the bass sound, but the sound and frequency are the same. Therefore, the user's brain wave can be induced by synchronizing the user's brain wave with the modulated sound and the base sound by the output of the modulated sound.

<Example 8>
The modulated sound may be a sound that is frequency-modulated at a predetermined frequency. In this case, in FIG. 35, the modulated sound generating unit 104 generates a sound obtained by frequency-modulating the sound having the pitch determined by the sound determining unit 103 with a predetermined frequency fq as a modulated sound. Specifically, for example, the frequency shift is performed on the sound of the determined pitch by (a × sin 2πfq × t) [0 <a <1/2, t: time].

  As described above, the modulated sound in this example is a sound obtained by shifting the pitch that is the reference of the bass sound by a predetermined frequency. Therefore, by outputting the modulated sound, the user's brain wave can be synchronized with the modulated sound and the base sound, and the user's brain wave can be guided to a predetermined frequency.

<Example 9>
The modulated sound may be a sound obtained by periodically changing the sound image localization of the sound having the pitch determined by the sound determining unit 103 (see FIG. 35).

  In this example, the output unit 105 (see FIG. 35) includes two speakers corresponding to the left and right ears. Also, the modulated sound generation unit 104 (see FIG. 35) assigns a sound having a pitch determined by the sound determination unit 103 to each of the two speakers. Then, one sound is multiplied by (a × sin 2πfr × t + (1−a)) [0 <a <½, t: time], and the other sound is (−a × sin 2πfr × t +). (1-a)) is multiplied. That is, in this example, two modulated sounds having different phases are generated by performing amplitude modulation on two sounds having the same pitch determined by the sound determining unit 103.

  One of the two speakers in the output unit 105 outputs one of the two generated modulated sounds, which is assigned to the speaker, and the other speaker is the other modulated sound assigned to the speaker. Is output.

  Thus, by outputting a modulated sound whose sound image localization periodically changes, the user's brain wave can be synchronized with the modulated sound and the user's brain wave can be induced.

[Twelfth embodiment]
In the eleventh embodiment, similarly to the fifth embodiment described above, modulated sound such as attenuated sound may be generated.

  In this case, in FIG. 35, the modulated sound generating unit 104 continues the sound having the pitch determined by the sound determining unit 103 and having a short length in a predetermined cycle in order to generate a modulated sound corresponding to the attenuated sound. Sound is generated as a modulated sound. That is, for example, it is assumed that the pitch “mi” is acquired by the pitch acquisition unit 102 and the pitch “mi” is determined as the pitch of the modulated sound by the sound determination unit 103. When the frequency perceived by the user's brain wave is 2 Hz, the modulated sound generation unit 104 generates a sound obtained by continuing the determined “mi” sound at a pace of twice per second as a modulated sound.

  With this configuration, it is possible to guide the user's brain wave to a predetermined frequency using a sound having a pitch that is a reference for the operation sound (bass sound) of a fan or the like.

[Thirteenth embodiment]
The parameter (volume or frequency) of the modulated sound exemplified in the eleventh and twelfth embodiments described above may be changed and output according to the user's sleep state, as in the sixth embodiment described above.

  In this case, the modulated sound generation unit 104 (see FIG. 35) includes a timer, for example. For example, the modulated sound generation unit 104 generates a modulated sound having a predetermined volume for each time according to the time measured by a timer. Also, the modulated sound generation unit 104 may generate a modulated sound that is modulated at a predetermined frequency for each time according to the time measured by the timer.

  By comprising in this way, the modulation | alteration sound suitable for a user's sleep state can be output, and the brain wave at the time of a user's sleep can be induced | guided | derived more effectively.

  Note that the sleep time measured by the timer may not be the sleep time of the user who hears the modulated sound. For example, when a plurality of people are sleeping side by side, a modulated sound having a volume corresponding to the sleep time of a person other than the user who should hear the modulated sound may be output. By doing so, it is possible to prevent other people's sleep from being disturbed by the output of the modulated sound.

  Further, for example, the user's biological information may be measured, the user's sleep state may be measured based on the biological information, and a modulated sound modulated at a predetermined frequency according to the sleep state may be generated.

[Fourteenth embodiment]
<Example 1>
In the 11th to 13th embodiments described above, an example in which only the modulated sound generated by the modulated sound generation unit 104 (see FIG. 35) is output from the output unit 105 has been described. You may make it output.

  In this case, as shown in FIG. 39, the output sound generation device 100a includes an output unit 105A and an output unit 105B each including one speaker. The output unit 105A outputs the modulated sound generated by the modulated sound generation unit 104. The output unit 105B outputs the bass sound collected by the sound source 101.

  Here, the bass sound collected from the output unit 105B is output. However, if the bass sound is an operation sound of a machine or the like, the collected bass sound may not be output. When the collected bass sound is output from the output unit 105B, the volume difference between the collected bass sound and the modulated sound is matched to compensate for the difference in distance between the speaker and the source of the operating sound, and effects such as reverberation can be achieved. Can be added.

<Example 2>
In the 11th to 13th embodiments described above, the modulated sound generated by the modulated sound generation unit 104 may be added to the base sound collected by the sound source 101 and output.

  In this case, as illustrated in FIG. 40, the output sound generation device 100 b includes an addition unit 106 and an output unit 115. The adding unit 106 generates an output sound obtained by adding the modulated sound generated by the modulated sound generating unit 104 and the bass sound collected by the sound source 101. The output unit 115 includes one speaker and outputs the output sound generated by the adder unit 106.

<Example 3>
In the first to eighth examples, the twelfth embodiment, and the thirteenth embodiment of the eleventh embodiment described above, the case where there is one type of bass sound has been described. But you can.

  For example, when the operation sounds of two different machines have a bass sound, in FIG. 35, the sound source 101 stores two bass sounds obtained by collecting the operation sounds of the two machines.

  The pitch acquisition unit 102 performs frequency spectrum analysis for each of the two bass sounds, and acquires a pitch corresponding to the peak frequency in the frequency spectrum of each bass sound.

  The sound determination unit 103 determines the pitch of the modulated sound for each bass sound based on the pitch acquired for each bass sound by the pitch acquisition unit 102.

  The modulated sound generation unit 104 modulates the sound having a pitch determined for each bass sound at a predetermined frequency to generate a modulated sound.

  The output unit 105 includes two speakers, outputs one of the two modulated sounds generated by the modulated sound generation unit 104 from one speaker, and outputs the other modulated sound from the other speaker. .

  With this configuration, the user can hear the two output modulated sounds overlapping. Therefore, the user can adjust the beat formed by the two output modulated sounds by directly changing the position and angle of the two output speakers.

<Example 4>
In the example 3, the example in which two modulated sounds are output from the respective speakers has been described. However, the two modulated sounds may be added and output. In this case, the output sound generation device 100c includes an addition unit 116 and an output unit 115 as shown in FIG. The adding unit 116 generates an output sound obtained by adding the two modulated sounds generated by the modulated sound generating unit 104. The output unit 125 includes one speaker and outputs the output sound generated by the adder unit 116.

<Example 5>
In Examples 2 and 3, the example in which the addition unit is provided has been described. However, the addition process may be performed in the modulated sound generation unit without providing the addition unit. That is, in the case of Example 2 above, in FIG. 40, the modulated sound generation unit 104 adds the generated modulated sound and the base sound collected by the sound source 101 to generate an output sound. The output unit 115 outputs the output sound generated by the modulated sound generation unit 104.

  In the case of Example 3, in FIG. 41, the modulated sound generation unit 104 adds two modulated sounds generated for each bass sound to generate an output sound. The output unit 105 outputs the output sound generated by the modulated sound generation unit 104. In this case, the output unit 105 only needs to include one speaker.

[Fifteenth embodiment]
In the 11th to 14th embodiments described above, for example, the output sound generation device may be a fan. In this case, the bass sound is the blowing sound, and the output sound generation device generates the output sound using the pitch according to the rotation speed of the fan as the pitch of the base sound.

  For example, when the rotational speed of the fan is Z (rpm) and the number of blades of the fan is N, the frequency of the fan is N × Z / 60 (Hz). The blowing sound is a narrow-band sound having a peak at this frequency, and includes a sound called a blade passing sound. The electric fan has, for example, three operation modes of “strong”, “medium”, and “weak” representing the strength of the air blowing. The rotational speed of the fan of the electric fan changes according to this operation mode, and the frequency of the blade passing sound changes depending on the rotational speed of the fan.

  Therefore, in the present embodiment, in the output sound generation device, the frequency corresponding to the operation mode of the fan is stored in advance, and the frequency corresponding to the operation mode of the fan is acquired as the pitch of the base sound.

  Specifically, as illustrated in FIG. 42A, the output sound generation device 100d includes a control unit 107, a drive, in addition to the sound determination unit 103, the modulated sound generation unit 104, and the output unit 105, which are the same as those in FIG. Unit 108 and a pitch acquisition unit 112. Hereinafter, a configuration specific to the present embodiment will be described.

  The control unit 107 includes a processor such as a CPU and a memory, and stores in advance a frequency corresponding to the operation mode. The control unit 107 receives an operation mode of the electric fan from a remote controller (not shown) and drives the drive unit 108 in the received operation mode. Further, the control unit 107 outputs a frequency corresponding to the accepted operation mode to the pitch acquisition unit 112.

  The drive unit 108 includes a fan and a motor that drives the fan. Under the control of the control unit 107, the drive unit 108 drives the motor at a rotational speed corresponding to the operation mode to rotate the fan.

  The pitch acquisition unit 112 acquires the pitch corresponding to the frequency output from the control unit 107 as the pitch of the base sound (air blowing sound).

  The sound determination unit 103 determines the pitch of the modulated sound based on the pitch acquired by the pitch acquisition unit 102 using the same method as in any of the above-described first to thirteenth embodiments.

  The modulated sound generation unit 104 generates a modulated sound for the sound having the pitch determined by the sound determination unit 103 using the same method as in any of the above-described first to thirteenth embodiments.

  The output unit 105 includes a single speaker and outputs the modulated sound generated by the modulated sound generation unit 104.

  As described above, by storing the frequency corresponding to the operation mode in advance, the pitch acquisition unit 112 can acquire the pitch of the bass sound without performing the frequency analysis of the bass sound. Therefore, the load required for frequency analysis can be reduced as compared with the case of performing frequency analysis of bass sound. Moreover, according to this structure, it is applicable also to the bass sound which has frequencies other than an audible frequency band.

(Application 1)
In the fifteenth embodiment, an example in which the output sound generation device itself is a fan has been described. However, the output sound generation device generates and outputs a modulated sound according to the operation mode of two externally provided fans. May be. That is, in this case, as illustrated in FIG. 42B, the output sound generation device 100 e is not provided with a drive unit, and includes a control unit 117 instead of the control unit 107. The control part 117 memorize | stores the frequency according to each operation mode of two fans. In addition, the control unit 117 acquires the operation mode from each of the two fans, and outputs a frequency corresponding to the operation mode to the pitch acquisition unit 112 for each fan.

  The pitch acquisition unit 112 acquires the pitch corresponding to the frequency for each electric fan output from the control unit 107 as the pitch of the base sound (fan sound) for each electric fan.

  Based on the pitch for each electric fan acquired by the pitch acquisition unit 102, the sound determination unit 103 uses the same method as that in any of the above-described first to thirteenth embodiments to adjust the pitch of the modulated sound for each electric fan. To decide.

  The modulated sound generation unit 104 uses the same method as in any of the above-described first to thirteenth embodiments for the sound of the pitch for each electric fan determined by the sound determination unit 103, and generates the modulated sound for each electric fan. Is generated.

  The output unit 105 includes two speakers. One speaker outputs one of the two modulated sounds generated by the modulated sound generation unit 104, and the other speaker outputs the other modulated sound.

(Application example 2)
In the application example 1, the modulated sound for each electric fan is output from separate speakers, but two modulated sounds may be added and output.

  In this case, as shown in FIG. 42C, the output sound generating device includes an adding unit 116 for adding the modulated sound for each electric fan generated by the modulated sound generating unit 104. The output unit 135 includes one speaker, and outputs an output sound obtained by adding by the adding unit 116.

  In this example, the addition unit 116 is provided, but the addition unit 116 may not be provided, and the modulation sound generation unit 104 may add the modulation sound for each electric fan and output it to the output unit 135. With this configuration, the output sound generation device can be realized with a simple configuration as compared with the case where the addition unit is provided.

[Sixteenth Embodiment]
In the above-described 11th to 15th embodiments, the operation sound of a machine such as a fan has been mainly described as an example of the base sound. However, the base sound is a BGM or the like flowing around the output sound generation device. There may be. In other words, the environmental sound serving as the bass sound may be a machine operating sound or music flowing around the output sound generating device. In short, the bass sound may be any sound having a peak frequency and a pitch.

[Seventeenth embodiment]
In the present embodiment, a case where the bass sound in the above-described 11th to 16th embodiments does not have a clear pitch will be described.

  For example, when the bass sound has a spectral structure indicated by a solid line in FIG. 43, the peak frequency cannot be specified, and the bass sound has no clear pitch. In this case, the broken-line spectrum structure specified from the solid-line spectrum structure in FIG. 43 is a spectrum structure that approximates the pitch of the bass sound. The two mountain-shaped portions in the spectrum structure are relatively narrow frequency bands, and the frequency f11 having the maximum amplitude value in the frequency band of the larger mountain-shaped portion is set as the peak frequency indicating the reference pitch of the base sound. The peak frequency included in the other frequency band is set as the frequency of the harmonic overtone of the base sound.

  FIG. 44 is a functional configuration diagram of the output sound generation device according to the present embodiment. The output sound generation device 100g includes an approximation unit 109 in addition to the configuration of FIG. The approximating unit 109 performs a frequency spectrum analysis on the bass sound of the sound source 101, specifies a frequency having a maximum amplitude value in a frequency band having the largest amplitude in the spectrum structure as the frequency of the base sound of the base sound, The peak frequency included in the frequency band is specified as the frequency of the overtone of the base sound.

  The pitch acquisition unit 102 acquires the pitch including the frequency specified by the approximating unit 109, that is, the frequency of the base tone as a pitch that serves as a reference for the base tone.

  With such a configuration, even if the bass sound is not a sound having a clear pitch, a modulated sound corresponding to the bass sound can be generated by approximating the pitch of the bass sound.

(Application 1)
In the seventeenth embodiment, when the base sound is the blowing sound of the electric fan shown in the fifteenth embodiment, the blowing sound does not have a clear pitch. The fan passing sound is actually not a single sound having a peak at the frequency of N × Z / 60 (Hz) described above, but a sound having a frequency distribution in the vicinity of this frequency, and does not have a clear pitch. .

  Therefore, in this case, for example, the approximation unit 109 stores the frequency of N × Z / 60 (Hz) corresponding to the operation mode as a peak frequency indicating the pitch in the operation mode for each operation mode of the electric fan. May be. Alternatively, from the frequency distribution in the vicinity of the frequency of N × Z / 60 (Hz) corresponding to the operation mode, a frequency indicating a pitch serving as a reference for the operation mode is specified in advance, and the specified frequency is associated with the operation mode. Then, it may be stored in advance in the approximation unit 109.

(Application example 2)
In the seventeenth embodiment, when the base sound is an environmental sound around the output sound generation device, the output sound generation device includes a microphone, and the pitch of the environmental sound received by the microphone is specified by the approximation unit 109. Good.

  As mentioned above, embodiment mentioned above is only the illustration for implementing this invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

[Modification]
(1) In the above-described embodiment, the output sound generation device has been described as including the output unit. However, a configuration without the output unit may be employed. In this case, the output sound generated by the output sound generation device can be output using a commercially available speaker or the like. The output sound generator and a commercially available speaker can be connected by wire or wireless.

  (2) In the output sound generation device described in the above-described embodiment (including modifications), each block may be individually made into one chip by a semiconductor device such as an LSI, or may include a part or all of the blocks. One chip may be used.

  Here, although LSI is used, it may be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.

  Further, the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

  Further, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. Biotechnology can be applied as a possibility.

  (3) Part or all of the processing of each functional block in each of the above embodiments may be realized by a program. A part or all of the processing of each functional block in each of the above embodiments is performed by a central processing unit (CPU), a microprocessor, a processor, or the like in the computer. A program for performing each processing is stored in a storage device such as a hard disk or a ROM, and is read out and executed in the ROM or the RAM. The storage device (storage medium) is a tangible material that is not temporary, and for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.

  (4) Each process of the above embodiment may be realized by hardware, or may be realized by software (including a case where it is realized together with an OS (operating system), middleware, or a predetermined library). . Further, it may be realized by mixed processing of software and hardware. Needless to say, when the output sound generating apparatus according to the above-described embodiment is realized by hardware, it is necessary to adjust timing for performing each process. In the above embodiment, for convenience of explanation, details of timing adjustment of various signals generated in actual hardware design are omitted.

DESCRIPTION OF SYMBOLS 1 ... Key acquisition part, 2 ... Addition sound determination part, 3 ... Addition sound production | generation part, 4,101 ... Sound source, 5 ... Addition part, 6, 6A-6C, 105, 105A, 105B, 115, 125, 135 ... Output , 21, 102, 112 ... pitch acquisition unit, 100 to 100g ... output sound generation device, 103 ... sound determination unit, 104 ... modulated sound generation unit, 106, 116 ... addition unit, 107, 117 ... control unit, 108 ... Drive unit, 109 ... approximation unit

Claims (34)

An output sound generation device that generates an output sound for controlling a body,
An acquisition unit that acquires sound information indicating a sound to be modulated based on a base sound that is a base of the output sound;
A sound included in the output sound, which is a modulated sound in which at least one of a volume, a pitch, and a tone color of a sound indicated by the sound information is periodically changed, or a sound indicated by the sound information is periodically A modulated sound generator for generating a continuous modulated sound;
An output sound generating device. The bass sound is music;
The acquisition unit acquires the music key as the sound information,
The modulated sound generation unit extracts any one of the first sound, the third sound, and the fifth sound of the acquired music key, and generates the modulated sound based on the extracted sound The output sound generation device according to claim 1.   The output sound generation device according to claim 2, wherein the modulated sound generation unit generates a sound obtained by performing amplitude modulation on the extracted sound at a predetermined frequency as the modulated sound.   The output sound generation device according to claim 2, wherein the modulated sound generation unit generates a sound obtained by frequency-modulating the extracted sound with a predetermined frequency as the modulated sound.   The output sound generation device according to claim 2, wherein the modulation sound generation unit generates a sound in which a sound having the same pitch as the extracted sound continues in a predetermined cycle as the modulation sound.   The output sound generation device according to claim 2, wherein the modulated sound generating unit generates two sounds having a predetermined frequency difference as the modulated sound based on the extracted sound.   When the acquired music key is a major key, the modulated sound generation unit is configured to generate the modulated sound, and the first sound, the third sound, and the fifth sound of the key acquired by the acquisition unit. In addition to the above, the output sound generation device according to any one of claims 3 to 6, wherein one sound is extracted from the second sound and the sixth sound.   When the acquired music key is a minor key, the modulation sound generation unit generates the modulation sound, and the first sound, the third sound, and the fifth sound of the key acquired by the acquisition unit are generated. The output sound generation device according to claim 3, wherein one sound is extracted from the fourth sound and the seventh sound.   The modulated sound generation unit is a sound that is extracted to generate the modulated sound, and has a frequency that is half the difference between the frequency of the sound and the frequency of a sound that is a semitone below the sound, greater than the predetermined frequency. The output sound generation device according to any one of claims 6 to 8, wherein the sound is extracted. An adding unit that generates two output sounds by adding the bass sound to each of the two modulated sounds;
An output unit that has two speakers corresponding to the left and right ears and outputs the output sound;
One speaker of the two speakers outputs one output sound of the two output sounds generated by the adding unit, and the other speaker outputs two output sounds generated by the adding unit. The output sound generation device according to any one of claims 6 to 9, which outputs the other output sound. An adding unit that generates an output sound by adding the two modulated sounds;
The output sound generation device according to any one of claims 3 to 9, further comprising: an output unit including a speaker that outputs the output sound and a speaker that outputs the bass sound.   The output sound generation device according to any one of claims 3 to 9, further comprising three output units that output the two modulated sounds and the bass sound, respectively. An adder for adding one of the two modulated sounds and the bass sound;
An output unit for outputting the output sound,
The said output part is provided with the speaker which each outputs the sound obtained by the addition of the said addition part, and the other modulation | alteration sound of the said 2 modulation sounds as said output sound. The output sound generating device described in 1. A sound collection unit for collecting the bass sound;
The output sound generation apparatus according to any one of claims 2 to 13, wherein the acquisition unit acquires a key of the bass sound collected by the sound collection unit. The acquisition unit acquires, as the sound information, a reference pitch serving as a reference for the bass sound based on a frequency spectrum of the bass sound,
The output sound generating device according to claim 1, wherein the modulated sound is a sound having a predetermined pitch difference from the reference pitch.   The modulated sound generator generates a sound shifted by a predetermined frequency with respect to a frequency corresponding to the reference pitch so that a monaural beat is formed when the bass sound and the modulated sound are superimposed. The output sound generation device according to claim 15, generated as:   The output sound generation device according to claim 15, wherein the predetermined pitch difference is any one of a minor third, a major third, a fourth, a fifth, a minor 6th, and a major 6 °. The predetermined pitch difference is a pitch difference constituting a chord and a sound of the reference pitch,
The output sound generation device according to claim 15, wherein the modulation sound generation unit generates at least two modulation sounds constituting the sound of the reference pitch and the chord.   The output sound according to claim 15, wherein the modulated sound generation unit generates a sound having the same tone color as the bass sound and amplitude-modulated at a predetermined frequency with respect to the sound of the reference pitch as the modulated sound. Generator.   The output sound generation device according to claim 15, wherein the modulated sound generation unit generates a sound having the same frequency spectrum as the reference pitch and having a pitch different from that of the base sound as the modulated sound.   The output sound generation device according to claim 15, wherein the modulated sound generation unit generates a sound obtained by performing amplitude modulation at a predetermined frequency on the sound of the reference pitch as the modulated sound.   The output sound generation device according to claim 15, wherein the modulated sound generation unit generates a sound obtained by frequency-modulating a sound of the reference pitch with a predetermined frequency as the modulated sound.   The output sound generation device according to claim 15, wherein the modulated sound generation unit generates a sound in which a sound of the reference pitch is continued at a predetermined period as the modulated sound.   The output sound generation device according to any one of claims 15 to 23, wherein the acquisition unit acquires a pitch based on a peak frequency in a frequency spectrum of the bass sound as the reference pitch. The bass sound is an environmental sound,
A sound collecting unit for collecting the environmental sound;
The output sound generation device according to any one of claims 15 to 24, wherein the acquisition unit acquires the reference pitch based on a frequency spectrum of the environmental sound collected by the sound collection unit. An adder that adds the modulated sound and the bass sound to generate the output sound;
An output unit for outputting the output sound generated by the addition unit;
The output sound generation device according to any one of claims 11 to 25, further comprising:   The output sound generation device according to any one of claims 11 to 25, further comprising an output unit including a speaker that outputs the bass sound and a speaker that outputs the modulated sound.   The modulated sound generation unit generates two modulated sounds having different sound image localizations by performing amplitude modulation at a predetermined frequency on the same two sounds as the extracted sound, respectively. Output sound generator.   The modulated sound generation unit generates two modulated sounds having different sound image localizations by performing amplitude modulation on the same two sounds as the sound of the reference pitch at a predetermined frequency, respectively. The output sound generation device described. It further includes an output unit including two speakers corresponding to the left and right ears,
30. The output according to claim 28 or 29, wherein one of the two speakers outputs one of the two modulated sounds, and the other speaker outputs the other modulated sound. Sound generator.   The output sound generation device according to any one of claims 1 to 30, wherein the modulated sound is a sound having a single frequency component.   The modulated sound generation unit changes at least one of a volume of the generated modulated sound, a frequency used when generating the modulated sound, and a frequency of the generated modulated sound itself as time elapses. Item 32. The output sound generation device according to any one of Items 1 to 31. An output sound generation method for generating an output sound for controlling a body,
Based on the base sound that is the base of the output sound, obtain sound information indicating the sound to be modulated,
A sound included in the output sound, which is a modulated sound in which at least one of a volume, a pitch, and a tone color of a sound indicated by the sound information is periodically changed, or a sound indicated by the sound information is periodically An output sound generation method for generating a continuous modulated sound. In the computer of the output sound generation device that generates the output sound for controlling the body,
Obtaining sound information indicating a sound to be modulated based on a base sound that is a base of the output sound; and
A sound included in the output sound, which is a modulated sound in which at least one of a volume, a pitch, and a tone color of a sound indicated by the sound information is periodically changed, or a sound indicated by the sound information is periodically Generating a continuous modulated sound; and
A program that executes

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