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DESCRIPTION JP2017079346

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DESCRIPTION JP2017079346
Abstract: PROBLEM TO BE SOLVED: To improve sleep and the like of a subject by generating a
sound in consideration of an environmental sound. SOLUTION: A reproduction apparatus 20
includes an acquisition unit 210 for acquiring biological information of a subject, a sound source
40 for reproducing sound content and outputting a first reproduction sound signal P1, and sleep
of the subject based on the biological information. The amplitude of the first reproduced sound
signal P1 is adjusted based on the estimation unit 230 for estimating the sleep index M
indicating the depth, the volume of the environmental sound and the estimated sleep index M,
and the second reproduced sound signal P2 is output. And an adjustment unit 260. [Selected
figure] Figure 2
Reproducing apparatus and program
[0001]
The present invention relates to a reproduction apparatus and program for reproducing sound
content.
[0002]
In recent years, a technology has been proposed that detects biological information such as body
movement, respiration, and heart rate and generates a sound according to the biological
information to provide sleep improvement and relaxation effects (see, for example, Patent
Document 1) ).
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In addition, in a system that controls reproduction of sound content in accordance with the
relaxation state of a person, a technique is also known that controls the volume in relation to the
depth of sleep (see, for example, Patent Document 2).
[0003]
JP, 4-269972, A JP, 2008-525055, A
[0004]
By the way, a person's sleep repeats light sleep and deep sleep at a constant rhythm four to five
times a night in a cycle of about 90 minutes.
On the other hand, in addition to the sound content leading to a good sleep, environmental
sounds such as the sound of a cooler indoors and the sound of a car outdoors are included in the
sounds heard by the sleeping user. In the prior art, since the volume of the reproduced sound is
determined without considering the environmental sound, the reproduced sound may be buried
by the environmental sound, which may not lead to a good sleep. In addition, when the total
volume of the reproduced sound and the environmental sound exceeds a predetermined level in
a shallow sleep state, the subject may wake up halfway and can not sleep well. 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 a subject by generating sounds in consideration of
environmental sounds.
[0005]
In order to solve the above problems, one aspect of a reproduction apparatus according to the
present invention includes an acquisition unit that acquires biological information of a subject, a
reproduction unit that reproduces sound content and outputs a first reproduction sound signal,
and the living body The amplitude of the first reproduced sound signal is adjusted based on the
information, based on an estimation unit that estimates a sleep index that indicates the depth of
sleep of the subject, and the volume of environmental sound and the estimated sleep index. And
an adjusting unit that outputs the second reproduced sound signal. According to this aspect, it is
possible to adjust the volume of the reproduced sound in consideration of not only the depth of
the subject's sleep but also the volume of the environmental sound.
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[0006]
In one aspect of the reproduction apparatus described above, the environmental sound is
obtained based on a reproduction sound obtained by the second reproduction sound signal, a
sound signal output from a microphone to which the environmental sound is input, and the
second reproduction sound signal. Preferably, the adjustment unit specifies a volume of the
environmental sound based on the environmental sound signal.
[0007]
When a microphone is used to collect the sound heard by the subject, the reproduced sound of
the sound content and the environmental sound are superimposed.
According to this aspect, since the cancellation unit generates the environmental sound signal
based on the reproduced sound, the sound signal on which the environmental sound is
superimposed, and the second reproduced sound signal corresponding to the reproduced sound,
two types of sounds are superimposed. It is possible to take out the environmental sound by
offsetting the reproduced sound from the sound. As a result, the volume of the environmental
sound can be identified with high accuracy, and the malfunction can be reduced.
[0008]
In one aspect of the reproduction apparatus described above, the adjustment unit may be
configured to adjust the volume of the reproduction sound as the volume of the reproduction
sound is larger than the volume of the environmental sound and the depth of sleep indicated by
the sleep index becomes shallower. It is preferable to adjust the amplitude of the first reproduced
sound signal so that the difference in volume of the environmental sound is reduced.
[0009]
According to this aspect, since the volume of the reproduction sound is adjusted to be higher
than the volume of the environmental sound, it is possible to improve that the subject is buried in
the environmental sound and the reproduction sound can not be heard.
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In addition, since the difference between the volume of the reproduced sound and the volume of
the environmental sound becomes smaller as the depth of sleep becomes shallower during a part
of the sleep, let the subject hear the reproduced sound when the sleep of the subject is shallow
While being able to reduce awakening on the way. Here, one sleep, a sleep period in which the
depth of sleep reaches deep sleep from the time of entering the bed, a wake-up preparation
period in which sleep depth changes in a direction in which the depth of sleep becomes shallow
toward wake-up, the end of the sleep period When dividing into sleep periods until the start of
the wake-up preparation period, it is preferable that at least a part of sleep periods be a sleep
period.
[0010]
In one aspect of the reproduction apparatus described above, the environmental sound is
obtained based on a reproduction sound obtained by the second reproduction sound signal, a
sound signal output from a microphone to which the environmental sound is input, and the
second reproduction sound signal. From the frequency spectrum of the environmental sound,
based on the frequency analysis result of frequency analysis of the environmental sound signal
and the frequency analysis unit for generating the environmental sound signal. It is preferable to
adjust the frequency characteristic to be given to the first reproduced sound signal so that the
frequency spectrum of the reproduced sound becomes large. According to this aspect, the
environmental sound signal is subjected to frequency analysis, and the frequency characteristic
and the gain are adjusted so that the frequency spectrum of the reproduced sound is larger than
the frequency spectrum of the environmental sound. It becomes possible.
[0011]
The invention of the reproducing apparatus described above can also be grasped as an invention
of a program of the reproducing apparatus provided with a computer. Such a program is, for
example, as follows. It is a program of a reproducing apparatus provided with a computer, and
the computer is based on an acquiring unit for acquiring biological information of a subject, a
reproducing unit for reproducing sound content and outputting a first reproduced sound signal,
and the biological information. And adjusting the amplitude of the first reproduced sound signal
based on the volume of the environmental sound and the estimated sleep index to estimate the
sleep index indicating the depth of the subject's sleep; It functions as an adjustment unit that
outputs as a sound signal.
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[0012]
FIG. 1 is a diagram showing an overall configuration of a system including a playback device
according to a first embodiment. FIG. 2 is a block diagram showing a functional configuration of
a playback device. It is an explanatory view for explaining a relation of an event and a sleep
depth. It is a block diagram showing an example of composition of a sound source of a
reproducing device, and an adjustment part. It is a graph which shows the change of the sleep
index in one sleep. It is a graph which shows the relation between the volume of environmental
sound and the volume of reproduction sound. It is a block diagram which shows the structure of
the adjustment part of 2nd Embodiment. It is a graph which shows an example of the
relationship between the frequency spectrum of environmental sound, the frequency spectrum of
the reproduction | regeneration sound after correction | amendment, and 1 / f characteristic.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a diagram showing the overall configuration of a system 1
including a playback apparatus 20 according to the first embodiment. As shown in the figure, the
system 1 is configured to include a sensor 11, a reproduction device 20, a speaker 51 and a
microphone 70. This system 1 is intended to improve sleep by making the subject E who is in a
supine posture on the bed 5 hear the sound emitted from the speaker 51. The playback device
20 can switch and play a plurality of sound contents. The system 1 detects biological information
of a subject by the sensor 11 and estimates the depth of sleep based on the detected biological
information. Further, the microphone 70 is used to detect the sound that the subject E is listening
to. This sound is a combination of the environmental sound and the reproduced sound of the
sound content emitted from the speaker 51. Then, based on the estimated depth of sleep and the
environmental sound, the volume of the reproduced sound is adjusted so as not to be awake for a
while in the state where the subject E hears and the sleep is shallow.
[0014]
The sensor 11 is made of, for example, a sheet-like piezoelectric element, and is disposed under
the mattress of the bed 5 or the like. When the subject E lies on the bed 5, the biological
information of the subject E is detected by the sensor 11. The body movement caused by various
things of the body including the respiration and the heartbeat of the subject E is detected by the
sensor 11, and a detection signal in which these components are superimposed is output from
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the sensor 11. Although the figure shows a configuration in which the detection signal is
transmitted to the reproduction device 20 by wire, for convenience, it may be transmitted by
wireless.
[0015]
The reproduction apparatus 20 can acquire the breathing cycle BRm, the cardiac cycle HRm, and
the body movement of the subject based on the detection signal (biological information) output
from the sensor 11. The playback device 20 is, for example, a portable terminal or a personal
computer, and the CPU executes a pre-installed program to construct a plurality of functional
blocks described later.
[0016]
The speaker 51 is disposed at a position where the subject E who is in the supine posture can
hear the sound, and is amplified by the built-in amplifier to emit sound. The microphone 70 is
disposed near the pillow, and converts the sound being listened to by the subject E into an
electrical signal and outputs it. The microphone 70 detects a sound superimposed with
environmental sounds such as a cooler sound and a car passing outdoor, in addition to the
reproduced sound of the sound content.
[0017]
FIG. 2 is a diagram mainly showing the configuration of functional blocks in the playback device
20 in the system 1. As shown in this figure, the playback apparatus 20 includes A / D converters
205 and 271, an acquisition unit 210, an estimation unit 230, a control unit 240, a storage unit
250, and a sound source 40 for outputting a first reproduced sound signal P1. It has a D / A
converter 261, an adjustment unit 260 for outputting the second reproduced sound signal P2,
and an echo canceller 270. Among them, the A / D converters 205 and 271, the D / A converter
261, the input unit 237. The functional blocks excluding the storage unit 250 are constructed by
the execution of the program. The sound source 40 may be configured by LSI (Large Scale
Integration). The storage unit 250 stores a content table and a personal table. A plurality of
sound contents are stored in the content table. Here, the sound content may be any data as long
as the sound source 40 can generate sound data. For example, performance data obtained by
converting performance information into data, or parameters for controlling the sound source 40
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may be used, or waveform data may be used. The point is that as long as the sound source 40
can be controlled, the form is not limited.
[0018]
The A / D converter 205 converts a 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 the digital signal to the estimation unit 230 and the control unit 240. The estimation unit
230 and the control unit 240 specify the breathing cycle BRm and the heartbeat cycle HRm of
the subject based on the detection signal of the sensor 11. Specifically, the frequency component
corresponding to the frequency range of the human heartbeat is extracted from the detection
signal, and the cardiac cycle HRm is specified from the signal digitized at a predetermined
threshold. In addition, since the heartbeat component to be superimposed on the detection signal
has a small amplitude compared to the respiratory component, a component having a small
amplitude may be added as a condition for extraction. Further, a frequency component
corresponding to the frequency range of human respiration is extracted from the detection
signal, and a breathing cycle BRm is specified from a signal digitized at a predetermined
threshold. The breathing cycle BRm and the cardiac cycle HRm are used by the control unit 240
as a biological rhythm. The respiration rate BR per minute may be specified instead of the
breathing cycle BRm, and the heart rate HR per minute may be specified instead of the cardiac
cycle HRm. That is, it is sufficient to specify heartbeat information on heartbeat and respiration
information on respiration. The control unit 240 controls the tempo of the heartbeat-linked
sound reproduced by the sound source 40 and controls the tempo of the respiration-linked
sound reproduced by the sound source 40 using the respiration information and the heartbeat
information. These correspond to parameters for controlling the sound source 40. Here, the
heart-linked sound is sound content which is waveform data having an amplitude envelope
having a length close to that of the heart beat, and the respiratory-linked sound is waveform data
having an amplitude envelope having a length close to that of a breathing period. And sound
content. The control unit 240 controls the tempo by controlling so that the sound source 40
repeatedly reproduces waveform data that is a heartbeat-linked sound for each heartbeat period
HRm, and repeatedly reproduces waveform data that is a respiration-linked noise for each
breathing cycle BRm. Do. Also, there are various methods for controlling the tempo of the sound
content. For example, waveform data of various tempos may be prepared in advance, and
waveform data of a tempo matching the cardiac cycle HRm or the respiratory cycle BRm may be
selected and reproduced. Further, when the sound content is performance data, the tempo for
reproducing the performance data may be changed in accordance with the tempo of breathing or
heartbeat. The input unit 237 is for the subject E to input various settings, and corresponds to a
touch panel or a keyboard.
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Using this, the subject E can input a wake-up time and the like. Moreover, it is used also for the
hearing test etc. which the test subject E performs before using this system 1. FIG.
[0019]
In the present embodiment, the estimation unit 230 estimates the sleep index M indicating the
depth of the subject's sleep based on the biological information output from the sensor 11. The
sleep depth is an example of the sleep index M. The estimation unit 230 supplies the estimated
sleep index M to the adjustment unit 260 via the control unit 240. In this example, the estimation
unit 230 determines the sleep depth indicating the depth of sleep from the subject E's resting to
a deep sleep and getting up to “Stand (Absolute)”, “Wake (Wake up)”, and “REM (Rem
sleep) “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 depth of sleep may be estimated in five
stages.
[0020]
More specifically, a state in which body movement immediately after bedtime changes greatly is
“Being out of bed”, a resting state in which body movement is relatively small, but a state in
which the β wave is dominant in the electroencephalogram pattern of subject E is “wakening”;
The state in which the θ wave appears in the electroencephalogram pattern of “1st stage ST1
and the second stage ST2”, and the state in which the δ wave appears in the
electroencephalogram pattern of the subject E is “3rd stage ST3 and the fourth stage ST4 The
θ wave appears in the EEG pattern of the subject E, but it is estimated that breathing is shallow
and irregular state is “REM sleep”. Various other known methods can be used for this
estimation.
[0021]
Further, in the present embodiment, from the viewpoint of inducing the sleep of the subject E to
be a good sleep, the control unit 240 should reproduce in accordance with the event that divided
the temporal change of the sleep depth in one sleep of the subject. Manage sound content. As
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events, as shown in FIG. 3, there are sleep onset induction SI (SleepIn), deep sleep induction DS
(DeepSleep), standby sequence IDL, awakening prevention SA (StopAwakening), awakening WA
(WakeUp), and awakening AL (ALarm). .
[0022]
Sleep onset induction SI is performed to induce the subject E to sleep onset during the period
from the subject E entering the bed until the sleep depth reaches the second stage ST2. The deep
sleep induction DS is performed to guide the subject E to a deeper sleep, and is performed while
the sleep depth is from the second stage ST2 to the fourth stage ST4 and while the fourth stage
ST4 is maintained. Ru. The standby sequence IDL is executed subsequent to the deep sleep
induction DS and ends when a predetermined time has elapsed from the start, and the sleep
depth often transitions from the fourth stage ST4 in the direction in which sleep is shallow. The
awakening prevention SA is started when the time TREM elapses after the sleep depth becomes
shallow and reaches REM sleep or more. Then, when a predetermined time has elapsed from the
start or the sleep depth reaches the second stage ST2, transition to deep sleep induction DS is
made. The awakening WA starts from the time TWS before the alarm set time and ends
immediately before the alarm set time. The alarm AL starts from the alarm setting time and is
executed until the subject E operates the end button. Here, the sleep induction SI corresponds to
the sleep period in which the depth of sleep reaches deep sleep (the state where the second stage
ST 2 is exceeded) from the bed, and the awakening WA and the alarm AL are a time TWS before
the alarm setting time. The wake-up preparation period, which is a period from the time of wake
up to wake-up, the deep sleep induction DS, the waiting sequence IDL, and the awakening
prevention SA are sleep periods from the end of the sleep onset period to the start of the wakeup preparation period. The control unit 240 divides one sleep into a sleep period, a sleep period,
and a wake-up preparation period, and controls the volume of reproduced sound according to
each period.
[0023]
In general, a person tends to have a long breathing cycle BRm and a cardiac cycle HRm during a
period from normal state to deep sleep. Also, the fluctuation of their period tends to be small. In
addition, the more you sleep, the less you move. Therefore, based on the detection signal of the
sensor 11, the estimation unit 230 combines the changes in the breathing cycle BRm and the
cardiac cycle HRm, and the number of body movements per unit time, and compares it with a
plurality of threshold values to achieve deep sleep. Estimate the The depth of sleep may be
estimated based only on the cardiac cycle HRm.
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[0024]
A person's sleep is divided roughly into light sleep rem sleep and deep sleep non rem sleep. At
the time of sleep onset, first transition to non-REM sleep and then transition to shallow sleep
REM sleep. A person's sleep repeats two types of sleep of different nature, at a constant rhythm,
four to five times a night in a cycle of about 90 minutes. Thus, a person's sleep fluctuates in a
depth of about 90 minutes. In the following description, the time variation of the depth of sleep
in one night's sleep is referred to as a sleep cycle.
[0025]
As described above, the microphone 70 converts the sound in which the environmental sound N
and the reproduction sound P are superimposed into the sound signal S, and supplies the sound
signal S to the A / D converter 271. The A / D converter 271 converts the sound signal S from an
analog signal to a digital signal and outputs it to the echo canceller 270. The echo canceller 270
is output from the microphone 70 to which the reproduction sound P and the environmental
sound N obtained by the second reproduction sound signal P2 are input, and is converted into
digital signals based on the sound signal S and the second reproduction sound signal P2. And
outputs an environmental sound signal S1 indicating the environmental sound N. For example,
the echo canceller 270 subtracts the second reproduction sound signal P2 from the sound signal
S converted into the digital signal to generate the environmental sound signal S1, and outputs the
environmental sound signal S1 to the adjustment unit 260.
[0026]
The control unit 240 controls the operation of the sound source 40, and specifies a sound
content to be reproduced from among a plurality of sound contents stored in the content table.
The control unit 240 also generates a personal profile and stores the personal profile in the
personal table of the storage unit 250 when the subject E uses the system 1 for the first time. In
order to improve the sleep of the subject E by sound, it is assumed that the sound must be heard
by the subject E. Therefore, information (volume information, sound quality information) on the
hearing ability of the subject E is measured and stored in the personal table. In order to measure
the hearing in advance and use it for correction of the content reproduction, the control unit 260
is controlled so as to vary the volume of the sound emitted from the speaker 51 actually installed
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in the bedroom, depending on whether the sound can be heard at the sleeping position Measure
your hearing. Specifically, when the volume is continuously varied and can not be heard, the
button is pressed to measure hearing. Alternatively, the volume is continuously decreased to
measure the volume that has become inaudible and the volume that has been increased to be
able to be audible, respectively, and the two values are compared to adopt a reasonable average.
Alternatively, sounds with different single volume may be reproduced, and hearing ability may be
estimated by the number of sounds heard. This value is used to correct the reference playback
volume for content playback so that the actual volume can be heard. Similarly, by measuring at a
plurality of different frequencies, the frequency characteristics of the hearing are measured to
adjust the sound quality.
[0027]
That is, the control unit 240 controls the adjusting unit 260 based on the measurement result of
the hearing ability of the subject E to adjust the volume and the sound quality so as to correct the
hearing ability of the subject E. Specifically, a first control signal C1 for controlling the sound
quality and a second control signal C2 for controlling the volume are output. The first control
signal C1 designates a frequency characteristic to be corrected, and the second control signal C2
designates a volume to be corrected. Such correction is measured by emitting sound from the
speaker 51 at the actual sleeping position, and thus includes the acoustic characteristics of the
device and the characteristics of the sound field environment. In other words, it is possible to
correct acoustic characteristics and environmental characteristics in addition to the hearing
characteristics of the subject E.
[0028]
Next, the sound source 40 corresponds to the reproduction unit of the present invention, and
reproduces the sound content designated by the control unit 240 and outputs the first
reproduction sound signal P1. The adjustment unit 260 adjusts the amplitude and frequency
characteristics of the first reproduced sound signal P1 and outputs the adjusted result as a
second reproduced sound signal P2.
[0029]
The detailed structure of the sound source 40 and the adjustment part 260 is shown in FIG. The
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sound source 40 includes first to third sound source units 410 to 430 and a mixer 451. The first
sound source unit 410 reproduces sound content (respiratory interlocking sound) interlocked
with the breathing cycle BRm, and the second sound source unit 420 reproduces sound content
interlocking with the cardiac cycle HRm (heartbeat interlocking sound). The sound source unit
430 reproduces sound content not linked to any of the breathing cycle BRm and the cardiac
cycle HRm. In the following description, a sound unrelated to the rhythm of the living body such
as the breathing cycle BRm or the cardiac cycle HRm may be referred to as background sound.
As the background sound, the sound of a wave, the sound of a wind, the sound of a serpent, the
sound of a crowd, etc. correspond. As described above, the sound content is a content having
three elements of a heartbeat-linked sound, a respiration-linked sound, and a background sound.
A fourth sound source unit may be provided to reproduce music.
[0030]
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 designated by the control unit 240, and
output it in a digital stereo two-channel format Do. The mixer 451 mixes (adds) the signals
output from the first to third sound source units 410 to 430, and outputs a first reproduced
sound signal P1.
[0031]
In addition, the adjustment unit 260 includes an equalizer 265, an amplifier 267, a volume
control unit 268, and a frequency characteristic control unit 269. The equalizer 265 applies
frequency characteristics to the first reproduced sound signal P1. The amplifier 267 amplifies
the first reproduced sound signal P1 to which the frequency characteristic is added to generate a
second reproduced sound signal P2.
[0032]
The frequency characteristic control unit 269 controls the equalizer 265 such that the frequency
characteristic specified by the first control signal C1 is obtained. For example, if the subject E is
an old man and it is difficult to hear highs, the equalizer 265 is controlled to emphasize 1.5 KHz
by 3 dB and 2 KHz by 5 dB. The volume control unit 268 specifies the volume of the
environmental sound N based on the environmental sound signal S1. Specifically, the
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environmental sound signal S1 is detected to acquire the volume. Then, the volume control unit
268 controls the gain of the amplifier 267 so that the volume of the reproduction sound P
becomes larger than the volume of the environmental sound N. As a result, it is possible to
output the second reproduced sound signal P2 in which the amplitude of the first reproduced
sound signal P1 is adjusted. Furthermore, the volume control unit 268 controls the gain of the
amplifier 267 based on the sleep index M indicating the depth of sleep. Specifically, in at least a
part of one sleep period, as the depth of sleep indicated by the sleep index M decreases, the
difference between the volume of the reproduced sound P and the volume of the environmental
sound N decreases. Control the gain of 267. The gain of the amplifier 267 is further controlled
based on the second control signal C2 after the above gain control.
[0033]
Gain control based on the sleep index M will be described with reference to FIGS. 5 and 6. FIG. 5
is a graph showing the change of the sleep index M in one sleep, and FIG. 6 is a graph showing
the relationship between the volume of the environmental sound N and the volume of the
reproduced sound P. As shown in FIG. As shown in FIG. 5, the sleep index M changes in a
plurality of cycles in one sleep. When the sleep index M indicates deep sleep, the subject E does
not wake up even at a large volume, but when the sleep index M indicates shallow sleep, the
subject E may wake up even at a small volume There is sex. Therefore, the volume control unit
268 controls the amplifier 267 so that the volume of the reproduced sound P is increased by a
predetermined volume based on the volume of the environmental sound N in the sleep onset
period. In the sleep period, the gain of the amplifier 267 is controlled so that the difference
between the volume of the reproduced sound P and the volume of the environmental sound N
decreases as the depth of sleep indicated by the sleep index M decreases. Furthermore, in the
wake-up preparation period, the gain of the amplifier 267 is controlled so that the difference
between the volume of the reproduced sound P and the volume of the environmental sound N
gradually increases as time passes.
[0034]
As described above, in the sleep asleep period, the volume of the reproduced sound P is made
larger than the volume of the environmental sound N by a predetermined volume, so the
inconvenience that the reproduced sound P is buried in the environmental sound N and can not
be heard by the subject E is improved can do. In addition, since the difference between the
volume of the reproduced sound P and the volume of the environmental sound N is controlled in
the sleep period according to the depth of sleep, halfway awakening can be prevented in a
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shallow sleep state, and in a deep sleep state The reproduced sound P is not buried in the
environmental sound N, and the subject E can be induced to sleep well. Furthermore, in the wakeup preparation period, the subject E can be induced to wake up.
[0035]
Second Embodiment Next, a second embodiment will be described. The playback device 20 of the
second embodiment is configured in the same manner as the playback device 20 of the first
embodiment, except that the adjustment unit 260A is used instead of the adjustment unit 260.
[0036]
FIG. 7 shows the configuration of the adjustment unit 260A of the second embodiment. The
adjustment unit 260A includes a frequency analysis unit 266. The frequency analysis unit 266
analyzes the frequency of the environmental sound signal S1 to specify the frequency spectrum
of the environmental sound N. The frequency characteristic control unit 269 controls the
equalizer 265 so that the frequency spectrum of the reproduced sound P is larger than the
frequency spectrum of the environmental sound N.
[0037]
More specifically, spectrum data representing the frequency spectrum is stored in the content
table in association with each sound content. The control unit 240 reads out the corresponding
spectrum data when selecting the sound content, and supplies the spectrum data to the
adjustment unit 260A. The frequency characteristic control unit 269 compares the spectrum
data with the analysis result of the frequency analysis unit 266, and controls the equalizer 265
so that the frequency spectrum of the reproduced sound P becomes larger than the frequency
spectrum of the environmental sound N. Good.
[0038]
Furthermore, it is preferable that the frequency spectrum of the sound that the subject E listens
to falls below the 1 / f (f is the frequency) characteristic in order not to disturb the comfortable
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sleep. Therefore, the frequency characteristic control unit 269 may control the equalizer 265 so
as not to exceed the 1 / f characteristic. This point will be described with reference to FIG. The
frequency spectrum of the environmental sound N is N (f), the frequency spectrum of 1 / f is R
(f), the frequency spectrum of the reproduced sound P before correction is P (f), and the
reproduced sound after correction is It is assumed that the frequency spectrum of P is P ′ (f)
(the frequency spectrum P (f) is omitted in FIG. 8). Here, in the case of N (f) ≧ P (f), the
frequency characteristic control unit 269 is an equalizer such that P ′ (f)> N (f) and R (f)> P ′
(f). Control the 265 In this case, the equalizer 265 may be controlled such that P '(f) = (R (f) + P
(f)) / 2. Further, in the case of N (f) <P (f), the equalizer 265 is controlled so that R (f)> P ′ (f). As
described above, in the present embodiment, the frequency spectrum of the environmental sound
N is specified, and the frequency characteristic to be imparted to the first reproduced sound
signal P1 is controlled so that the frequency spectrum of the reproduced sound P exceeds the
frequency spectrum of the environmental sound N. The subject E can listen to the reproduced
sound P not buried in the environmental sound N, which makes it possible to improve the sleep.
[0039]
<Modification> The present invention is not limited to the above-described embodiment, and
various applications and modifications as described below are possible, for example. In each of
the embodiments described above, the biological information of the subject E is detected using
the sheet-like sensor 11. However, 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. Alternatively, a second sensor may be attached to
the wrist of the subject E to detect, for example, pressure change in the radial artery, that is, a
pulse wave. Since the pulse wave is synchronized with the heartbeat, it indirectly detects the
heartbeat. In addition, a third sensor for detecting acceleration may be provided between the
head of the subject E and the pillow, and body motion of the subject E, specifically, respiration,
heartbeat, etc. may be detected. Moreover, as a type of sensor for detecting biological
information, a pressure sensor, an air pressure sensor, a vibration sensor, an optical sensor, an
ultrasonic Doppler, an RF Doppler, a laser Doppler, etc. can be considered. Although the first
control signal C1 and the second control signal C2 are supplied to the adjustment unit 260 in
order to correct the subject's hearing in each embodiment described above, the present invention
is not limited to this. It does not have to be done.
[0040]
DESCRIPTION OF SYMBOLS 1 ... System 11, 11 ... Sensor, 20 ... Reproduction apparatus, 40 ...
Sound source, 51 ... Speaker, 210 ... Acquisition part, 230 ... Estimation part, 240 ... Control part,
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260 ... Adjustment part, 265 ... Equalizer, 266 ... Frequency analysis part , 267 ... amplifier, 268 ...
volume control unit, 269 ... frequency characteristic control unit.
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