JP2017070571A - Sound source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sleep, etc. by generating a sound corresponding to characteristics of each subject.SOLUTION: A sound device 20 includes an acquisition part 210 for acquiring biological information on a subject, a sound source 40 for reproducing a sound content designated from a plurality of sound contents, an estimation part 230 for estimating the depth of sleep based on the biological information, an evaluation part 235 for monitoring the transition of the depth of sleep, and evaluating an effect that the reproduced sound content has on the sleep of the subject, and a control part 240 for designating a sound content to be reproduced by the sound source 40 from the plurality of sound contents based on the result of the evaluation by the evaluation part 235.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sound source device.

  In recent years, a technique has been proposed in which biological information such as body movement, breathing, and heartbeat is detected and a sound corresponding to the biological information is generated to improve sleep and provide a relaxation effect (see, for example, Patent Document 1). ). In addition, a technique for adjusting at least one of the type of sound to be generated, the volume, and the tempo according to the relaxed state of the subject has been proposed (see, for example, Patent Document 2).

JP-A-4-269972 JP 2004-344284 A

By the way, the influence of the sound that the subject hears or feels during sleep on sleep varies depending on the subject. However, in the conventional technique, even if the sleep of a subject can be improved by changing the volume, tempo, and type of music according to the relaxed state of the subject, the sleep can be improved for other subjects. It may not have been possible.
The present invention has been made in view of such circumstances, and an object of the present invention is to improve sleep and the like of each subject by generating sounds corresponding to the characteristics of each subject.

In order to solve the above problem, an aspect of a sound source device according to the present invention includes an acquisition unit that acquires biological information of a subject, a sound source that reproduces sound content specified from a plurality of sound contents,
Based on the biological information, an estimation unit that estimates a sleep depth indicating the depth of sleep of the subject;
One of the sound contents is reproduced in the sound source, the transition of the sleep depth estimated by the estimating unit is monitored based on the biological information acquired by the acquiring unit, and the reproduced sound content is An evaluation unit that evaluates an influence on the sleep of the subject, and a control unit that specifies sound content to be reproduced by the sound source from the plurality of sound contents based on an evaluation result of the evaluation unit.

  According to this aspect, while estimating the sleep depth based on the biological information of the subject, the influence of the sound content on the sleep of the subject can be evaluated, and the sound content to be reproduced is designated based on the evaluation result. be able to. For this reason, it becomes possible to improve the quality of sleep by reproducing | regenerating suitable sound content according to the characteristic of each test subject. Furthermore, since the evaluation is performed when the sound content is reproduced, the accuracy of the evaluation is improved as the number of times of using the sound source device is increased. That is, since the sound source device can learn the influence of the sound content on the subject's sleep, the sleep quality of the subject can be improved as the number of times the sound source device is used increases.

  In one aspect of the above-described sound source device, the evaluation unit compares the transition of the sleep depth set in advance with the sleep depth estimated by the estimation unit, and the reproduced sound content is determined by the subject. It is preferable to evaluate the effect on sleep. According to this aspect, since the transition of the target depth of sleep is set, the accuracy of evaluation can be improved.

  In one aspect of the sound source device described above, the control unit controls at least one of the volume and the sound quality so as to correct the hearing of the subject by controlling the sound source based on the measurement result of the hearing of the subject. It is preferable to provide a correction unit. The subject's hearing ability varies, and varies depending on the age. By correcting the sound content reproduced by the sound source so that the subject can hear it, the sound content can sufficiently affect the sleep of the subject.

  In one aspect of the sound source device described above, the evaluation unit evaluates the sound content for each of a plurality of events that classify temporal changes in the sleep depth estimated by the estimation unit, and Each is associated with one or a plurality of the events, and the control unit is configured to output the sound content associated with the current event based on the evaluation result of the evaluation unit evaluating the sound content for each event. The sound content to be reproduced by the sound source is preferably designated from among the above.

  According to this aspect, the sound content can be evaluated for each event, and the sound content to be reproduced can be specified from the plurality of contents associated with the event based on the evaluation result. The sleep cycle periodically repeats REM sleep and non-REM sleep. That is, there are cases where the sleep depth changes in the direction of increasing depth and in the direction of decreasing depth of sleep. Thus, it is not preferable to evaluate uniformly when the nature of sleep differs. According to this aspect, the sound content is evaluated for each of a plurality of events in which temporal changes in the sleep depth are classified, and the sound content is designated, so that the sound content can be reproduced in consideration of the sleep cycle of the subject.

  In one aspect of the sound source device described above, an evaluation storage unit that stores an evaluation value that is an evaluation result of the evaluation unit in association with the event and the sound content is included, and the evaluation unit evaluates the sound content. The evaluation value stored in the evaluation storage unit is updated, and the control unit refers to the evaluation value in the evaluation storage unit, and the sound source is selected from the sound contents associated with the current event. It is preferable to specify the sound content to be reproduced. According to this aspect, since the evaluation unit updates the evaluation value, the influence of the reproduced sound content on the sleep of the subject can be reflected in the specification of the sound content.

  In one aspect of the sound source device described above, the evaluation unit is a predetermined time from the time when the predetermined event makes a transition to another event, or the time when the sleep depth estimated by the estimation unit changes. It is preferable to evaluate the current sound content and the previous sound content in accordance with the ratio between the current sound content playback time and the previous sound content playback time. The influence of the sound content on the sleep of the subject can be known by the change in the sleep depth. At the time when the sleep depth changes, the current sound content is being played back, but it is highly probable that the previous sound content also contributes to the change in the sleep depth. According to this aspect, since the evaluation value is determined according to the ratio of the reproduction time, the accuracy of the evaluation of the sound content can be improved.

  In one aspect of the above-described sound source device, the sound source device includes an input unit that reproduces part or all of the plurality of sound contents using the sound source, and can input an impression felt by the subject, and the control unit includes the input unit. It is preferable to set the initial value of the evaluation value based on the impression input using the input. According to this aspect, since the result of the sensitivity evaluation of the subject is reflected in the initial value of the evaluation value, the evaluation value corresponding to the characteristics of the subject is set earlier than in the case where a uniform value is adopted as the initial value. It is possible to improve the sleep of the subject.

The above-described sound source device invention can also be understood as a sound source device program invention including a computer. For example, such a program is as follows.
A program for a sound source device including a computer, the computer based on an acquisition unit that acquires biological information of a subject, a sound source that reproduces sound content specified from a plurality of sound contents, and the biological information Based on the biological information acquired by the acquisition unit when reproducing one of the sound contents in the sound source, the estimation unit estimating the sleep depth indicating the depth of sleep of the subject, Based on the evaluation result of the evaluation unit, the evaluation unit that monitors the transition of the sleep depth estimated by the estimation unit and evaluates the effect of the reproduced sound content on the sleep of the subject, and the evaluation unit It is made to function as a control part which designates the sound content which the said sound source should reproduce | regenerate from sound content.

It is a figure which shows the whole structure of the system containing the sound source device which concerns on embodiment. It is a block diagram which shows the function structure of a sound source device. It is explanatory drawing for demonstrating the relationship between an event and sleep depth. It is explanatory drawing which shows an example of a sound content evaluation screen. It is a block diagram which shows the structural example of the sound source of a sound source device. It is a flowchart which shows operation | movement of a sound source device. It is explanatory drawing for demonstrating calculation of a sleep sleep evaluation value. It is a flowchart which shows the processing content of a deep sleep guidance process. It is a flowchart which shows the processing content of standby sequence processing. It is a flowchart which shows the processing content of the awakening prevention process. It is a flowchart which shows the processing content of an awakening process. It is a flowchart which shows the processing content of an alarming process. It is explanatory drawing for demonstrating the input screen of subjective evaluation.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an overall configuration of a system 1 including a sound source device 20 according to the first embodiment. As shown in the figure, the system 1 includes a sensor 11, a sound source device 20, and speakers 51 and 52. This system 1 is intended to improve sleep by causing a subject E taking a supine posture on the bed 5 to hear sounds emitted from the speakers 51 and 52 or to feel them by vibration. It is. The sound source device 20 can switch and reproduce a plurality of sound contents. The system 1 detects the biological information of the subject using the sensor 11 and estimates the depth of sleep based on the detected biological information. And the sound content reproduced | regenerated based on the estimated depth of sleep is evaluated, and a sound content is automatically changed so that the quality of the test subject's E sleep may improve according to the said evaluation.

  The sensor 11 is made of, for example, a sheet-like piezoelectric element, and is disposed below the mattress of the bed 5. When the subject E lies on the bed 5, the biological information of the subject E is detected by the sensor 11. Body movements caused by various things including the breathing and heartbeat of the subject E are detected by the sensor 11, and a detection signal in which these components are superimposed is output from the sensor 11. In the drawing, for convenience, the configuration in which the detection signal is transmitted to the sound source device 20 by wire is shown, but a configuration in which the detection signal is transmitted wirelessly is also possible.

  The sound source device 20 can acquire the subject's breathing cycle BRm, heart rate cycle HRm, and body movement based on the detection signal (biological information) output from the sensor 11. Based on the detection signal (biological information) output from the sensor 11, the sleep depth of the subject E can be estimated, and the parameters of the sound generated from the speakers 51 and 52 can be stored in association with the sleep depth. It has become. The sound source device 20 is, for example, a portable terminal or a personal computer, and a plurality of functional blocks to be described later are constructed by the CPU executing a program installed in advance.

  The speakers 51 and 52 are arranged at positions where the subject E in a supine posture can hear a stereo sound. Among these, the speaker 51 receives a stereo left (L) signal output from the sound source device 20 as a built-in amplifier. Amplify and emit sound. Similarly, the speaker 52 amplifies the stereo light (R) signal output from the sound source device 20 with a built-in amplifier and emits the sound. In addition, although there may be a configuration in which the subject E listens to the sound with headphones, in the present embodiment, the configuration using the speakers 51 and 52 will be described.

  FIG. 2 is a diagram illustrating a configuration of functional blocks mainly in the sound source device 20 in the system 1. As shown in this figure, the sound source device 20 includes an A / D converter 205, an acquisition unit 210, an estimation unit 230, an evaluation unit 235, a control unit 240, a storage unit 250, a sound source 40, and a D / A converter 261. 262, among which the functional blocks excluding the A / D converter 205, the D / A converters 261 and 262, and the input unit 237 are constructed by executing the program. The sound source 40 may be configured by LSI (Large Scale Integration). The storage unit 250 stores a content table, an evaluation table, and a personal table. The content table stores a plurality of sound contents. Here, the sound content may be any data as long as sound data can be generated in the sound source 40. For example, performance data obtained by converting performance information into data, parameters for controlling the sound source 40, or waveform data may be used. In short, any format can be used as long as the sound source 40 can be controlled.

The A / D converter 205 converts the detection signal from the sensor 11 into a digital signal. The acquisition unit 210 temporarily stores the converted digital signal in the internal memory, and outputs it to the estimation unit 230 and the control unit 240. The estimation unit 230 and the control unit 240 specify the respiratory cycle BRm and the heartbeat cycle HRm of the subject based on the detection signal of the sensor 11. Specifically, a frequency component corresponding to a human heartbeat frequency range is extracted from the detection signal, and the heartbeat cycle HRm is specified from the digitized signal. Since the heartbeat component superimposed on the detection signal has a smaller amplitude than the respiratory component, a component with a small amplitude may be added as an extraction condition. Further, a frequency component corresponding to the frequency range of human breathing is extracted from the detection signal, and the respiratory rate BR is specified from the digitized signal. The respiratory cycle BRm and the heartbeat cycle HRm are used by the control unit 240 as a biological rhythm. Note that the respiratory rate BR per minute may be specified instead of the respiratory cycle BRm, and the heart rate HR per minute may be specified instead of the heartbeat cycle HRm. That is, heart rate information relating to heartbeat and respiration information relating to breathing may be specified. The control unit 240 controls the tempo of the heartbeat-linked sound reproduced by the sound source 40 and the tempo of the breath-linked sound reproduced by the sound source 40 using the breathing information and the heartbeat information. These correspond to parameters for controlling the sound source 40. Here, the heartbeat-linked sound is sound content that is waveform data having an amplitude envelope with a length close to the cycle of heartbeat, and the breath-linked sound is waveform data having an amplitude envelope with a length close to the cycle of breathing. Is assumed to be sound content. The control unit 240 controls the tempo by controlling the sound source 40 to repeatedly reproduce waveform data that is a heartbeat-linked sound for each heartbeat cycle HRm and to repeatedly reproduce waveform data that is a breath-linked sound for each breathing cycle BRm. To do.
There are various methods for controlling the tempo of the sound content. For example, waveform data having various tempos may be prepared in advance, and waveform data having a tempo that matches the heartbeat cycle HRm or the respiratory cycle BRm may be selected and reproduced. When the sound content is performance data, the tempo for reproducing the performance data may be changed according to the tempo of breathing or heartbeat.
The input unit 237 is for the subject E to input various settings, and includes a touch panel and a keyboard, and includes a start button that the subject E operates when entering the floor and an end button that operates when getting up. The system 1 is also used for prior evaluation of sound content performed before the subject E uses the system 1.

  In the present embodiment, the estimation unit 230 estimates the sleep depth indicating the depth of sleep of the subject based on the biological information output from the sensor 11. In this example, the estimation unit 230 sets the sleep depth indicating the depth of sleep from the subject E to rest, deep sleep, and getting up to “Stand”, “Wake”, “REM”. ”,“ ST1 (first stage) ”,“ ST2 (second stage) ”,“ ST3 (third stage) ”, and“ ST4 (fourth stage) ”. In this example, the sleep depth indicating the depth of sleep is estimated in seven stages, but the first stage ST1 and the second stage ST2 are “shallow sleep”, and the third stage ST3 and the fourth stage ST4 are “deep sleep”. The sleep depth may be estimated in five stages.

  Specifically, the state in which the body movement changes greatly immediately after going to bed is “getting out of bed”, the resting state having relatively little body movement, but the state in which the β wave is dominant in the brain wave pattern of the subject E is “wakening”, the subject E The state where the θ wave appears in the EEG pattern of “the first stage ST1 and the second stage ST2”, and the state where the δ wave appears in the brain wave pattern of the subject E “the third stage ST3 and the fourth stage ST4”. “A θ wave appears in the brain wave pattern of the subject E, but it is estimated that the respiration is shallow and the irregular state is“ REM sleep ”. In addition to this, various known methods can be used for this estimation.

  Moreover, in this embodiment, from the viewpoint of inducing the sleep of the subject E to a good sleep, the sound content to be reproduced is managed according to the event in which the temporal change of the sleep depth in one sleep of the subject is classified. . As shown in FIG. 3, the events include sleep onset induction SI (SleepIn), deep sleep induction DS (DeepSleep), standby sequence IDL, awakening prevention SA (StopAwakening), awakening WA (WakeUp), and awakening AL (ALarm). .

  The sleep onset induction SI is executed in order to guide the subject E to fall asleep during the period from when the subject E enters the bed until he falls asleep. The deep sleep induction DS is executed to guide the subject E to deeper sleep, and is executed while the sleep depth reaches from the second stage ST2 to the fourth stage ST4. The standby sequence IDL is executed following the deep sleep induction DS, and ends when a predetermined time elapses from the start of the standby sequence IDL, and the sleep depth often transitions from the fourth stage ST4 in a direction in which sleep becomes shallower. The awakening prevention SA starts when the time TREM elapses after the sleep depth becomes shallower and becomes more than REM sleep. Then, when a predetermined time elapses from the start of the awakening prevention SA or the sleep depth reaches the second stage ST2, the state transitions to the deep sleep induction DS. The awakening WA starts from a time TWU before the alarm set time and ends just before the alarm set time. Alarm AL starts from the alarm setting time and is executed until subject E operates the end button.

  In general, a person tends to have a long respiratory cycle BRm and a heartbeat cycle HRm during a period from a normal state to deep sleep. In addition, the fluctuation of those cycles tends to be small. In addition, body movements decrease as sleep becomes deeper. Therefore, the estimation unit 230 combines the changes in the respiratory cycle BRm and the heartbeat cycle HRm and the number of body movements per unit time based on the detection signal of the sensor 11 and compares it with a plurality of threshold values, thereby comparing the depth of sleep. Estimate. Note that the depth of sleep may be estimated based only on the heartbeat cycle HRm.

  The evaluation unit 235 performs real-time evaluation. In the real-time evaluation, when one of the sound contents is reproduced on the sound source 40, the transition of the sleep depth estimated by the estimation unit 230 is monitored and reproduced based on the biological information acquired by the acquisition unit 210. An evaluation value is generated by evaluating the influence of the sound content on the sleep of the subject E, and this is stored in the evaluation table in association with the sound content and the event. Moreover, before using this system 1, the control part 240 performs prior evaluation of sound content. The result of the prior evaluation of the sound content is stored in the personal table.

  Human sleep is roughly divided into REM sleep with shallow sleep and non-REM sleep with deep sleep. At the time of falling asleep, it first shifts to non-REM sleep, and then shifts to REM sleep with a shallow sleep. A person's sleep repeats two types of sleep different in nature at a constant rhythm 4 to 5 times a night with a period of about 90 minutes. Thus, the depth of human sleep fluctuates with a period of about 90 minutes. In the following description, the time variation of the sleep depth in the overnight sleep is referred to as a sleep cycle.

  First, the evaluation unit 235 sets a time variation (target sleep cycle) of the sleep depth to be a target from the sleep cycle when the subject E has a good sleep in advance. The target sleep cycle represents the temporal change in the depth of sleep from the time of going to bed (or after going to sleep) to get up, and at least the depth of sleep necessary for the evaluation of sound content described later. The time required for migration is set. For example, the time until the transition from entering the bed to REM sleep, the time until the sleep stage advances by one stage, and the like. For this target setting, for example, after the subject E gets up while recording the sleep cycle in the storage unit 250, the subject's E subjective evaluation for sleep is input in five stages using the input unit 237. Then, a plurality of sleep cycles having “5” having the highest subjective evaluation stored in the storage unit 250 may be specified, an average value thereof may be calculated, and this may be set as a target. Further, an ideal sleep cycle of a general person may be defined and set as a target.

  In the prior evaluation of the sound content, the control unit 240 controls the sound source 40 so as to read out the sound content specified by the input unit 237 from the content table stored in the storage unit 250. Then, every time playback of one sound content is finished, the sound content evaluation screen shown in FIG. 4 is displayed. When the subject E touches the screen, a vertical bar is displayed, and the sound content is evaluated at the position of the vertical bar. May be. In this case, the input unit 237 is configured with a touch panel, on which a sound content evaluation screen is displayed.

The sound content holds evaluation values for each event of SI, DS, IDL, SA, WA, and AL. The initial value of each evaluation value is determined for 10 items by input to the sound content evaluation screen in FIG. In this example, ten conflicting concepts such as “comfortable” and “harsh” are displayed in the left and right columns. Since 10 items have different weights depending on each event (SI, DS, SA, IDL, WA, AL), the 10 input values are weighted according to each event to be set as initial values.
The initial value is associated with the event and the sound content and stored in the evaluation table. After that, the subject E repeats sleep, sleep, and wake up, and each evaluation value of the sound content is updated through each event, which is suitable for personal sleep. It becomes the evaluation value.

  The control unit 240 controls the operation of the sound source 40 and designates the sound content to be reproduced based on the evaluation result of the evaluation unit 235 from the plurality of sound contents stored in the content table. More specifically, the control unit 240 refers to the content stored in the evaluation table, and designates the sound content that the sound source 40 should reproduce from the sound content associated with the current event.

  The sound source 40 reproduces various musical sounds based on the sound content stored in the content table of the storage unit 250. FIG. 5 shows a detailed configuration of the sound source 40. The sound source 40 includes first to third sound source units 410 to 430, mixers 451 and 452, and equalizers 453 and 454. The first sound source unit 410 reproduces sound content (breathing-linked sound) linked to the breathing cycle BRm, the second sound source unit 420 plays sound content (beat-linked sound) linked to the heartbeat cycle HRm, and the third The sound source unit 430 reproduces sound content that is not linked to either the respiratory cycle BRm or the heartbeat cycle HRm. In the following description, sounds irrelevant to the rhythm of the living body such as the respiratory cycle BRm and the heartbeat cycle HRm may be referred to as background sounds. Examples of background sounds include wave sounds, wind sounds, murmur sounds, and hustle sounds. As described above, the sound content is a content having three elements of heartbeat-linked sound, breath-linked sound, and background sound. Note that a fourth sound source unit may be provided to play back music.

The first to third sound source units 410 to 430 switch and reproduce the sound content stored in the content table of the storage unit 250 at the timing specified by the control unit 240, and output it in a digital two-channel format. To do.
The mixer 451 mixes (adds) the left (L) signals output from the first to third sound source units 410 to 430, and similarly, the mixer 452 is output from each of the sound source units. The sound signal of light (R) is mixed.
The equalizer 453 gives sound quality (frequency characteristics) to the output signal of the mixer 451 and adjusts the volume. Similarly, the equalizer 454 imparts sound quality (frequency characteristics) to the output signal of the mixer 452 and adjusts the volume. Control information for designating sound quality (frequency characteristics) and volume is generated by the control unit 240.

When the subject E uses the system 1 for the first time, the control unit 240 generates a personal profile and stores it in the personal table of the storage unit 250. In order to improve the sleep of the subject E by sound, since the sound must be heard by the subject E as a premise, information (volume information, sound quality information) regarding the hearing ability of the subject E is measured and stored in the personal table.
Since the effect changes depending on the volume, in order to measure the hearing in advance and use it to correct the content reproduction, the volume of the speakers 51 and 52 actually installed in the bedroom is varied, and the hearing is measured based on whether or not the sound is heard at the sleeping position. Specifically, the volume is measured by pressing a button or the like when the sound is no longer audible after being continuously varied. Alternatively, measure the volume at which you can hear it, compare both values and adopt a reasonable average. Or you may reproduce | regenerate the sound from which a single volume differs, and estimate hearing by the number heard. Using this value, the reference volume for content playback is corrected so that the volume can be actually heard. Similarly, by measuring at a plurality of different frequencies, the frequency characteristic of hearing is measured and the sound quality is adjusted.
That is, the control unit 240 controls the sound source 40 based on the measurement result of the hearing of the subject E, and adjusts the volume and the sound quality so as to correct the hearing of the subject E. Note that the control unit 240 may adjust at least one of volume and sound quality.
Since such correction is measured by emitting sound from the speakers 51 and 52 at the actual sleeping position, it includes the acoustic characteristics of the device and the characteristics of the sound field environment. In other words, the acoustic characteristic and the environmental characteristic can be corrected together with the hearing characteristic of the subject E.

  Next, the D / A converter 261 shown in FIG. 2 converts the left (L) sound signal whose frequency characteristics and volume are adjusted by the equalizer 453 into an analog signal and outputs the analog signal. Similarly, the D / A converter 262 converts the sound signal of the light (R) whose frequency characteristics and volume are adjusted by the equalizer 454 into an analog signal and outputs the analog signal.

FIG. 6 is a flowchart showing the operation of the sound source device 20. The operation of the system 1 will be described with reference to FIG. 3 in the order of sleep onset induction process S1, deep sleep induction process S2, standby sequence process S3, awakening prevention process S4, awakening process S5, and awakening process S6. .
As shown in FIG. 6, first, the control unit 240 determines whether or not the start button has been operated (step Sa1), and if the determination result indicates affirmation, the sleep content is reproduced at the volume VolSI. The sound source 40 is controlled (step Sa2). In this case, the control unit 240 refers to the evaluation table of the storage unit 250 and designates the sound content having the highest sleep onset evaluation value from the plurality of sound contents for sleep onset. As a result, the sound source 40 starts playing the designated sound content.

  As shown in FIG. 3, when the start button is operated at time t0, the control unit 240 sets the sleep flag SF to inactive (L). And the control part 240 monitors biometric information, and when the subject's E body stops moving by simple vibration measurement, it makes the sleep flag SF active. In the example shown in FIG. 3, the sleep flag SF becomes active at time t1 after the sleep depth becomes REM sleep REM.

  Returning to FIG. In step Sa3, the control unit 240 determines whether or not the sleep sleep flag SF is active. When the determination result is negative, the control unit 240 determines whether or not the time TSI has elapsed since the start of reproduction of the sound content being reproduced (step Sa4). When the determination result is negative, the control unit 240 returns the process to step Sa3. On the other hand, if the determination result is affirmative, the sound content is reproduced and the time TSI elapses, and the sleep content does not fall asleep, and the sound content is less likely to fall asleep. Therefore, the evaluation unit 235 updates the sleep sleep evaluation value of the sound content being reproduced by “−1” (step Sa5). More specifically, the evaluation unit 235 reads out the sleep onset evaluation value corresponding to the sound content in the evaluation table, subtracts “1” from the read out sleep evaluation value, and generates a new sleep onset evaluation value. Store in a table. Here, the time TSI is a time determined based on the target sleep cycle described above. Hereinafter, set times such as TDS, TIDL, TSA, and TWU used in each event are also determined based on the target sleep cycle. In this manner, the evaluation unit 235 compares the transition of the sleep depth set in advance (target sleep cycle) with the transition of the actually estimated sleep depth, and evaluates the influence of the sound content on sleep.

  Thereafter, the control unit 240 changes the sound content for sleep (Step Sa6). Specifically, the control unit 240 refers to the evaluation table so as to reproduce the sound content having the highest sleep sleep evaluation value by excluding the sound content whose sleep sleep evaluation value has been updated from the plurality of sleep sleep content contents. The sound source 40 is controlled. As a result, the sound contents are reproduced in descending order of the sleep evaluation value until reaching sleep. When the process of step Sa6 ends, the control unit 240 returns the process to step Sa3.

  Next, when the determination result of step Sa3 is affirmative, the control unit 240 determines whether or not the sound content being played back is the sound content played back first in the sleep-inducing process S1 (step Sa7). When the sound content is the first played content and the determination result is affirmative, the evaluation unit 235 updates the sleep sleep evaluation value of the currently played sound content to “+1” (step Sa8). More specifically, the evaluation unit 235 reads the sleep onset evaluation value corresponding to the sound content in the evaluation table, adds “1” to the read sleep onset evaluation value, generates a new sleep onset evaluation value, and evaluates this Store in a table.

  Next, when the determination result in step Sa7 is negative, that is, when the sound content being played back is not the sound content played back first in the sleep-inducing process S1, the evaluation unit 235 determines the sound content being played back and the previous sound The sleep onset evaluation value is calculated according to the time ratio of the content, and the sleep onset evaluation value is updated (step Sa9). More specifically, as shown in FIG. 7, the current sound content playback time wa1 and the immediately preceding sound content playback time wb1 between the time when the sleep sleep flag SF becomes active and the time TSI in the past. A sleep evaluation value is determined according to the ratio. For the current sound content, “wa1 / (wa1 + wb1)” is added to update the sleep onset evaluation value. On the other hand, for the previous content, “wb1 / (wa1 + wb1) +1” is added to update the sleep onset evaluation value. For the immediately preceding content, not only “wb1 / (wa1 + wb1)” but also “1” is added. The sleep evaluation value of the immediately preceding content is “−1” at the time of switching to the current sound content. Because. Since the sleep sleep flag becomes active, the sleep sleep evaluation value is increased in steps Sa8 and Sa9.

  For example, in the example shown in FIG. 7, when wb1: wa1 = 0.7: 0.3, the previous sound content evaluation is +1.7, and the current sleep content evaluation value is +0.3. This is because the reason why the sleep flag SF becomes active is considered not only in the current sound content but also in the immediately preceding sound content. As described above, the playback time of the current sound content and the immediately preceding sound content for a predetermined time from the time when the sleep transition SI, which is an example of the predetermined event, is changed to the deep sleep induction, which is an example of another event. By evaluating the current sound content and the immediately preceding sound content in accordance with the ratio to the playback time, the evaluation value can be distributed at the time ratio. As a result, the accuracy of the evaluation of the sound content can be improved.

  When the process of step Sa8 or Sa9 shown in FIG. 6 is completed, the control unit 240 executes the deep sleep induction process S2. In addition, you may make it perform deep sleep induction | guidance | derivation process S2 after predetermined time, after the process of step Sa8 or Sa9 is complete | finished. FIG. 8 is a flowchart showing the contents of the deep sleep guidance process S2. As shown in FIG. 8, first, the control unit 240 controls the sound source 40 so as to reproduce the sound content for deep sleep at the volume VolDS (step Sb1). In this case, the control unit 240 refers to the evaluation table of the storage unit 250 and designates the sound content having the highest deep sleep evaluation value from among the plurality of sound contents for deep sleep. As a result, the sound source 40 starts playing the designated sound content.

  Thereafter, the control unit 240 determines whether or not the current time is before the time TWU of the alarm setting time (step Sb2). When the determination result is affirmative, the control unit 240 makes a transition to the awakening process (step Sb3). On the other hand, when the determination result indicates negative, the control unit 240 determines whether or not the sleep depth stage has progressed or retreated (step Sb4). The stage progression means movement in a direction where the sleep depth increases, and the stage retreat means movement in a direction where the sleep depth becomes shallow.

  When there is no stage advance / retreat, the control unit 240 determines whether or not the time TDS has elapsed since the reproduction of the deep sleep sound content being reproduced (step Sb5). If the determination result is negative, the control unit 240 returns the process to step Sb2. On the other hand, if the determination result is affirmative, the sound content is played and the stage does not progress even after the time TDS has elapsed, and it is considered that the effect of inducing deep sleep of the sound content is small. It is done. Therefore, the control unit 240 changes the sound content being reproduced (step Sb6). In this case, the control unit 240 refers to the evaluation table, excludes the current sound content from the plurality of deep sleep sound contents, and causes the sound source 40 to reproduce the sound content having the highest deep sleep evaluation value. Control. As a result, it is possible to reproduce sound content that is effective in inducing deep sleep.

  On the other hand, in the determination process of step Sb4, if there is a progress / retreat of the stage and a positive determination result is obtained, the evaluation unit 235 performs the reproduction between the time when the stage has shifted to the time before the time TDS. The deep sleep evaluation value is updated according to the time ratio of the sound content that has been played (step Sb7).

  More specifically, assuming that the playback time of the current sound content at time TDS is wa2 and the playback time of the previous sound content is wb2, when the sleep depth stage advances, “wa2 / (wa2 + wb2)” is added to obtain a deep sleep evaluation value. On the other hand, for the immediately preceding sound content, “wb2 / (wa2 + wb2)” is added to update the deep sleep evaluation value. When the sleep depth stage is retreated, “wa2 / (wa2 + wb2)” is subtracted from the current sound content to obtain a deep sleep evaluation value. On the other hand, the deep sleep evaluation value is updated by subtracting “wb2 / (wa2 + wb2)” for the immediately preceding sound content. That is, the current sound content and the previous sound content are evaluated according to the ratio of the playback time of the current sound content and the playback time of the previous sound content for a predetermined time from the time when the sleep depth changes. To do. Thereby, the deep sleep evaluation value recorded in the evaluation table is updated. When the sleep depth stage is advanced, the deep sleep evaluation value is increased, and when the stage is retreated, it is decreased.

  When the process of step Sb6 or step Sb7 is completed, the control unit 240 advances the process to step Sb8, and determines whether the time TSL has elapsed since the sleep flag SF became active or the fourth stage ST4 has been reached. To do. When the determination result indicates negative, the control unit 240 returns the process to step Sb2, and when the determination result indicates positive, the control unit 240 shifts to the standby sequence process (step Sb10).

  FIG. 9 shows the processing contents of the standby sequence processing S3. First, the control unit 240 reproduces the standby sound content with the volume VolIDL (step Sc1). In this case, the control unit 240 refers to the evaluation table in the storage unit 250 and designates the sound content having the highest standby evaluation value from the plurality of standby sound contents. As a result, the sound source 40 starts playing the designated sound content.

  Next, the control unit 240 determines whether or not a predetermined time has elapsed since the start of the standby sequence (step Sc2). When this determination result indicates affirmation, the control unit 240 makes a transition to deep sleep guidance processing (step Sc3). On the other hand, if the determination result is negative, the control unit 240 determines whether or not the stage has been retracted (step Sc4). When there is no stage retreat, the determination result is affirmative, and the control unit 240 determines whether or not the time TIDL has elapsed since the start of reproduction of the sound content (step Sc5). If time TIDL has not elapsed, control unit 240 returns the process to step Sc2. On the other hand, if the time TIDL has elapsed, the evaluation unit 235 adds “1” to the standby evaluation value of the sound content being reproduced and updates it (step Sc6). Since the stage does not move backward even after the time TIDL has elapsed, the standby evaluation value is increased.

If there is a stage retreat of the sleep depth and the determination result in step Sc4 is negative, the evaluation unit 235 updates the standby evaluation value of the sound content being played back to “−1”. Since the stage has moved backward, the waiting evaluation value is lowered.
(Step Sc7). Specifically, the evaluation unit 235 generates a new standby evaluation value by subtracting “1” from the standby evaluation value of the sound content read from the evaluation table, and writes the generated standby evaluation value in the evaluation table. Update by In the standby sequence process, the sound content has a low meaning of sleep intervention and it is evaluated that it does not adversely affect sleep, so the time TIDL is relatively short. Further, the evaluation including the immediately preceding sound content is not performed, and if there is no stage retreat, the reproduction of the sound content is continued.

  Next, when the process of step Sc7 ends, the control unit 240 changes the sound content (step Sc8). In this case, the control unit 240 refers to the evaluation table, excludes the sound content being reproduced from the plurality of standby sound contents, and controls the sound source 40 to reproduce the sound content having the highest standby evaluation value. .

  Next, when the process of step Sc6 or step Sc8 ends, the control unit 240 determines whether or not the sleep depth is equal to or greater than the REM sleep REM (the state where sleep is shallow) (step Sc9). If the determination result is negative, the control unit 240 returns the process to step Sc2. On the other hand, if the determination result is affirmative, it is determined whether or not the time TREM has elapsed since becoming the REM sleep REM (step Sc10), and when the time TREM has elapsed, the control unit 240 transitions to an awakening prevention process. (Step Sc11).

  FIG. 10 shows the processing contents of the awakening prevention process S4. First, the control unit 240 reproduces the sound content for preventing awakening at the volume VolSA (step Sd1). In this case, the control unit 240 refers to the evaluation table in the storage unit 250 and designates the sound content having the highest arousal prevention evaluation value from the plurality of sound contents for awakening prevention. As a result, the sound source 40 starts playing the designated sound content.

  Next, the control unit 240 determines whether or not the stage has advanced / retreated (step Sd2). When this determination result indicates affirmation, the evaluation unit 235 updates the arousal prevention evaluation value according to the ratio of the reproduction time of the sound content reproduced before the time TSA from the stage transition time (step Sd3).

  More specifically, assuming that the playback time wa3 of the current sound content at the time TSA is the playback time wb3 of the previous sound content, when the sleep depth stage progresses, for the current sound content, “wa3 / (Wa3 + wb3) "is added to obtain an evaluation value for preventing arousal. On the other hand, for the previous sound content, “wb3 / (wa3 + wb3)” is added to update the arousal prevention evaluation value. When the sleep depth stage is retreated, “wa3 / (wa3 + wb3)” is subtracted from the current sound content to obtain an evaluation value for preventing arousal. On the other hand, for the immediately preceding sound content, “wb3 / (wa3 + wb3)” is subtracted to update the arousal prevention evaluation value. That is, the current sound content and the previous sound content are evaluated according to the ratio of the playback time of the current sound content and the playback time of the previous sound content for a predetermined time from the time when the sleep depth changes. To do. Thereby, the arousal prevention evaluation value recorded in the evaluation table is updated. When the sleep depth stage progresses, the wakefulness prevention evaluation value is increased, and when it is retreated, it is decreased.

  When the determination result of step Sd2 is negative, or when the process of step Sd3 ends, the control unit 240 determines whether or not the time TSA has elapsed since the start of reproduction of a certain sound content (step Sd4). When the determination result is negative, the control unit 240 returns the process to step Sd2. On the other hand, when the determination result is affirmative, the control unit 240 controls the sound source 40 to change the sound content (step Sd5). Specifically, referring to the evaluation table, the sound content being reproduced is excluded from the plurality of sound contents for awakening prevention, and the sound content with the highest arousal prevention evaluation value is designated. As a result, the sound source 40 starts playing the designated sound content.

  Next, the control unit 240 determines whether a predetermined time has elapsed since the transition to the awakening prevention process or whether the second stage ST2 has been reached (step Sd6). If the determination result is negative, the control unit returns the process to step Sd2, and if the determination result is affirmative, the control unit 240 transitions the process to deep sleep induction processing (step Sd7).

Next, the awakening process will be described. As described with reference to FIG. 8, the awakening process is started when the time TWU of the alarm time is reached (step Sb3). FIG. 11 is a flowchart showing the processing contents of the awakening process S5.
First, the control unit 240 reproduces the awakening sound content with the volume VolWA (step Se1). In this case, the control unit 240 refers to the evaluation table in the storage unit 250 and designates the sound content having the highest arousal evaluation value from among the plurality of sound contents for awakening. As a result, the sound source 40 starts playing the designated sound content.

Next, the control unit 240 determines whether or not the current time has reached the alarm time (step Se2). When the determination result is affirmative, the control unit 240 shifts the process to a wake-up process (step Se3).
On the other hand, when the determination result is negative, the control unit 240 determines whether or not the stage has progressed / retreated (step Se4). If this determination result indicates affirmation, the evaluation unit 235 updates the arousal evaluation value in accordance with the proportion of the reproduction time of the sound content reproduced before the time TWA from the stage transition time (step Se5).

  More specifically, assuming that the playback time of the current sound content at time TWA is wa4 and the playback time of the immediately preceding sound content is wb4, when the sleep depth stage is moved backward, “wa4 / (wa4 + wb4)” is added to obtain a wakefulness evaluation value. On the other hand, for the previous sound content, “wb4 / (wa4 + wb4)” is added to update the arousal evaluation value. Further, when the sleep depth stage advances, “wa4 / (wa4 + wb4)” is subtracted from the current sound content to obtain a wakefulness evaluation value. On the other hand, for the previous sound content, “wb4 / (wa4 + wb4)” is subtracted to update the arousal evaluation value. That is, the current sound content and the previous sound content are evaluated according to the ratio of the playback time of the current sound content and the playback time of the previous sound content for a predetermined time from the time when the sleep depth changes. To do. Thereby, the arousal evaluation value recorded in the evaluation table is updated. When the sleep depth stage is retreated, the arousal evaluation value is increased, and when the stage is advanced, the arousal evaluation value is decreased.

  When the determination result of step Se4 is negative, or when the process of step Se5 ends, the control unit 240 determines whether or not the time TWA has elapsed since the start of reproduction of a certain sound content (step Se6). When the determination result is negative, the control unit 240 returns the process to step Se2. On the other hand, when the determination result is affirmative, the control unit 240 controls the sound source 40 to change the sound content (step Se7). Specifically, referring to the evaluation table, the sound content being reproduced is excluded from the plurality of sound contents for awakening, and the sound content with the highest arousal evaluation value is designated. As a result, the sound source 40 starts playing the designated sound content. When the process of step Se7 ends, the control unit 40 returns the process to step Se2.

Next, the alarm processing will be described. FIG. 12 is a flowchart showing the processing contents of the alarm processing S6.
First, the control unit 240 plays the alarm sound content at the volume VolAL (step Sf1). In this case, the control unit 240 refers to the evaluation table in the storage unit 250 and designates the sound content having the highest alarm evaluation value from among the plurality of sound contents for alarm. As a result, the sound source 40 starts playing the designated sound content.

Next, the control unit 240 determines whether or not the subject E has woken up (step Sf2). In this process, the control unit 240 determines whether or not the subject E has operated the end button. When the determination result is negative, the control unit 240 determines whether or not the time TAL has elapsed since the start of reproduction of a certain sound content (step Sf3). When the determination result is negative, the control unit 240 returns the process to step Sf2. On the other hand, if the determination result is affirmative, the subject E does not wake up even when the sound content is reproduced for the time TAL, so that the sound alarm effect of the sound content is considered to be small. In this case, the evaluation unit 235 updates the alarm evaluation value of the sound content being reproduced by “−1” (step Sf4). Specifically, the evaluation unit 235 reads the wake-up evaluation value of the sound content from the evaluation table, generates a new wake-up evaluation value by subtracting “1”, and writes the generated wake-up evaluation value in the evaluation table. Update the wake-up evaluation value.
Thereafter, the control unit 240 controls the sound source 40 to change the sound content (step Sf5). In this case, the control unit 240 refers to the evaluation table, excludes the sound content being reproduced from the plurality of sound contents for alarm, and controls the sound source 40 to reproduce the sound content having the highest alarm evaluation value. . When the process of step Sf5 ends, the control unit 240 returns the process to step Sf2.
Next, when the subject E wakes up and the determination result in step Sf2 is affirmative, the evaluation unit 235 updates the wakeup evaluation value according to the ratio of the reproduction time of the sound content reproduced before the time TAL from the wake-up time. (Step Sf6).

  More specifically, if the playback time of the current sound content at time TAL is wa5 and the playback time of the previous sound content is wb5, “wa5 / (wa5 + wb5)” is added for the current sound content. The wake-up evaluation value. On the other hand, for the immediately preceding sound content, “wb5 / (wa5 + wb5) +1” is added to update the wakeup evaluation value. For the previous content, not only “wb5 / (wa5 + wb5)” but also “1” is added. The wakeup evaluation value of the previous content is “−1” at the time of switching to the current sound content. Because. Since the subject E has woken up, the alarm evaluation value is increased. In addition to evaluating whether or not the subject E has occurred, the content may be evaluated from a change in heartbeat cycle or sleep depth obtained from the detection signal of the sensor 11. That is, the evaluation is increased if the sleep depth becomes shallow or the heartbeat cycle is shortened during a predetermined time, and the evaluation is decreased if the sleep depth remains deep or the heartbeat cycle is not shortened.

<Modification>
The present invention is not limited to the above-described embodiments, and various applications and modifications as described below are possible, for example. In addition, one or a plurality of arbitrarily selected aspects of application / deformation described below can be appropriately combined.

<Modification 1>
In each of the above-described embodiments, the biological information of the subject E is detected using the sheet-like sensor 11, but the present invention is not limited to this, and any biological information can be detected. A sensor may be used. For example, the electrode of the first sensor may be attached to the forehead of the subject E, and the brain waves (α wave, β wave, δ wave, θ wave, etc.) of the subject E may be detected. Further, a second sensor may be attached to the wrist of the subject E to detect, for example, a radial artery pressure change, that is, a pulse wave. Since the pulse wave is synchronized with the heartbeat, the heartbeat is indirectly detected. Further, a third sensor for detecting acceleration may be provided between the head of the subject E and the pillow, and the body movement of the subject E, specifically, respiration and heartbeat may be detected. In addition, as a type of sensor for detecting biological information, a pressure sensor, a pneumatic sensor, a vibration sensor, an optical sensor, an ultrasonic Doppler, an RF Doppler, a laser Doppler, and the like can be considered.

<Modification 2>
In each embodiment mentioned above, although the evaluation part 235 evaluated evaluation of the sound content based on biometric information, this invention is not limited to this.
The evaluation of the sound content may be performed by the subject E using the input unit 237 after getting up. For example, the evaluation may be input by displaying the input screen illustrated in FIG. 13 and causing the subject E to perform a touch operation. In this example, the sleep state is arranged on the vertical axis, and the preference of sound content is arranged on the horizontal axis. For this reason, if the test subject E touches once, both evaluations can be performed simultaneously.
Moreover, since the evaluation of the subject E is executed after getting up, the evaluation is not performed for each event or each sound content but for the entire sleep cycle. For this reason, it is preferable to uniformly update the evaluation values for all of the sound content reproduced during sleep. However, the subjective evaluation after waking up is preferably used in combination with the real-time evaluation by reducing the weight as compared with the real-time evaluation.

<Modification 3>
In the above-described embodiment, sound contents are reproduced in descending order of evaluation value in each event, but the present invention is not limited to this.
The control unit 240 may specify sound content randomly at a predetermined rate in the selection of sound content. For example, combinations of sound content elements (heartbeat-linked sound, breath-linked sound, background sound) and parameters (volume / sound quality / sound field / tempo) can be varied randomly to select combinations and parameters that improve the effect. You may search.
Alternatively, the control unit 240 randomly varies the combination of the elements of the sound content and the plurality of parameters, and the evaluation unit 235 evaluates the sleep depth. If a direction for improvement is found, the control unit 240 controls a combination of elements and parameters in that direction. If not improved, the control unit 240 may repeat evaluation by changing the combination of elements and parameters at random again.
The sound content linked to breathing or heartbeat may be music that is generally distributed, and music of various tempos is stored in advance in the content table of the plurality of storage units 250, and the respiratory cycle BRm or heartbeat is stored. You may make it select and reproduce | regenerate the music of the tempo suitable for the period HRm. Here, when switching music, it is better to match the beat of the previous music with the beat of the subsequent music.
Further, the sound content may be singing or reading, and in that case, it may be based on speech synthesis.

DESCRIPTION OF SYMBOLS 1 ... System, 11 ... Sensor, 20 ... Sound source device, 40 ... Sound source, 51, 52 ... Speaker, 210 ... Acquisition part, 230 ... Estimation part, 235 ... Evaluation part, 240 ... Control part.

Claims (8)

An acquisition unit for acquiring biological information of the subject;
A sound source that plays the specified sound content from multiple sound content,
Based on the biological information, an estimation unit that estimates a sleep depth indicating the depth of sleep of the subject;
One of the sound contents is reproduced in the sound source, the transition of the sleep depth estimated by the estimating unit is monitored based on the biological information acquired by the acquiring unit, and the reproduced sound content is An evaluation unit for evaluating the influence on sleep of the subject;
Based on the evaluation result of the evaluation unit, a control unit for designating sound content to be reproduced by the sound source from the plurality of sound contents;
A sound source device comprising:   The evaluation unit compares the transition of the sleep depth set in advance with the sleep depth estimated by the estimation unit, and evaluates the influence of the reproduced sound content on the sleep of the subject. The sound source device according to claim 1, wherein 2. The control unit according to claim 1, wherein the control unit controls the sound source based on a measurement result of the subject's hearing to adjust at least one of volume and sound quality so as to correct the hearing of the subject. 2. The sound source device according to 2. The evaluation unit evaluates the sound content for each of a plurality of events divided into temporal changes in the sleep depth estimated by the estimation unit,
Each of the plurality of sound contents is associated with one or a plurality of the events,
The control unit specifies sound content to be reproduced by the sound source from sound contents associated with a current event, based on an evaluation result obtained by the evaluation unit evaluating the sound content for each event.
The sound source device according to claim 1, wherein the sound source device is a sound source device. An evaluation storage unit that stores an evaluation value that is an evaluation result of the evaluation unit in association with the event and the sound content;
When the evaluation unit evaluates the sound content, the evaluation unit updates the evaluation value stored in the evaluation storage unit,
The control unit refers to the evaluation value of the evaluation storage unit, and designates sound content to be reproduced by the sound source from sound content associated with a current event.
The sound source device according to claim 4. The evaluation unit includes a playback time of the current sound content immediately before the transition from a predetermined event to another event, or a predetermined time from the time when the sleep depth estimated by the estimation unit changes. Evaluate the current sound content and the previous sound content according to the proportion of the sound content's playback time,
The sound source device according to claim 4, wherein the sound source device is a sound source device. Reproducing a part or all of the plurality of sound contents with the sound source, comprising an input unit capable of inputting an impression felt by the subject,
The control unit sets an initial value of the evaluation value based on an impression input using the input unit;
The sound source device according to claim 5 or 6. A program for a sound source device equipped with a computer,
The computer,
An acquisition unit for acquiring biological information of the subject;
A sound source that plays the specified sound content from multiple sound content,
Based on the biological information, an estimation unit that estimates a sleep depth indicating the depth of sleep of the subject;
One of the sound contents is reproduced in the sound source, the transition of the sleep depth estimated by the estimating unit is monitored based on the biological information acquired by the acquiring unit, and the reproduced sound content is An evaluation unit for evaluating the influence on sleep of the subject;
Based on the evaluation result of the evaluation unit, as a control unit for designating sound content to be reproduced by the sound source from the plurality of sound content,
Sound source device program to function.

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