JPH09130887A - Acoustic signal presentation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an excess burden on one's ears by adding reverberation components to an acoustic signal and adjusting a sound pressure level by taking the psycho-logical volume of sound into consideration. SOLUTION: The acoustic signals from a monophonic signal source 1 are supplied to reverberation sound addition means 2 L and 2 R via an input means 1a. In the means 2L and 2R, the reverberation components are prepared from the acoustic signals, these reverberation components are added to the acoustic signals and the signals are supplied to output level adjustment means 3L and 3R. In the means 3L and 3R, the voltage levels of the inputted signals are adjusted and the levels are sent to an output means 1b. In the means 1b, the acoustic signals are supplied to a headphone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic signal presenting apparatus for reproducing and presenting an audio signal by means of acoustic reproducing means arranged near both ears of a human.

[0002]

2. Description of the Related Art As a device for reproducing / presenting by sound reproducing means arranged near both ears of a human, for example, a device using headphones, a device in which a speaker is embedded in a headrest of a sofa, and the like are known. Further, recently, an apparatus which simultaneously presents an image and a sound using an HMD (head mounted display) has come into use. This device is composed of a small image display means mounted on the face and used for displaying an image, a sound reproducing means arranged in the vicinity of both ears for presenting sound, and various control devices and the like. It is a thing.

By the way, it is known that continuous hearing of sound at a high volume causes deafness. Therefore, it is desirable to present the sound with the volume suppressed as much as possible even in the above-mentioned device and the like. In addition, when used for a long period of time such as for business use, it is desirable to further reduce the volume.

In a widely used portable headphone stereo device, it is necessary to adjust the volume so that it is easy to hear when there is a large amount of ambient noise such as when walking or when riding in a vehicle. For example, JP-A-2-92
Japanese Unexamined Patent Application Publication No. 100 is provided with a noise input microphone that inputs noise around the headphones, a comparison circuit that compares the noise value with a reference value, an output volume variable circuit that varies the output volume based on the comparison, and the like. Discloses a method of automatically adjusting the output from the headphones according to the above.

[0005]

However, the above-mentioned acoustic signal presenting device is intended only to control the physical quantity of the sound pressure level by adjusting the output of the headphones, and the human ear does not actually operate. It does not take into account the loudness of the sound to be perceived, and may overload the human ear.

The acoustic signal presenting apparatus of the present invention has been made in view of such a problem, and its purpose is to consider not only physical sound but also psychological sound volume. The object of the present invention is to provide an acoustic signal presenting device that does not apply an excessive load to the human ear by adjusting the sound pressure level.

[0007]

In order to achieve the above object, a first invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic converter arranged near an ear and outputting the sound. Acoustic signal input means for receiving a signal, reverberation adding means for creating a reverberation component from the input acoustic signal and adding it to the acoustic signal, and output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means. And acoustic signal output means for outputting the adjusted output signal.

A second aspect of the present invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, and acoustic signal input means for receiving the acoustic signal and the input acoustic signal. Reverberation adding means for creating a reverberation component from a signal and adding it to an acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from this reverberation adding means, and output signal of the output signal output from this output level adjusting means. Maximum output control signal generating means for outputting a control signal when the voltage level is equal to or higher than a preset voltage level and output for a preset time, and the output according to the output of the maximum output control signal generating means At least one of the voltage level of the signal output from the level adjusting means, the reverberation-to-sound energy ratio, or the interaural cross-correlation coefficient. An output level control means for controlling the to and a sound signal output means for outputting a control signal at this output level control means.

A third aspect of the present invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, and acoustic signal input means for receiving the acoustic signal and the inputted acoustic signal. Reverberation adding means for creating a reverberation component from the signal and adding it to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from this reverberation adding means, and sound pressure placed in the ear canal or near the ear canal entrance The ear canal sound pressure measuring means for measuring and the maximum output of the control signal when the sound pressure value output from this ear canal sound pressure measuring means is equal to or higher than a preset sound pressure value and exceeds a preset time. Depending on the output control signal generating means and the output of the maximum output control signal generating means, the voltage level or the residual level of the output signal output from the output level adjusting means. Comprising an output level control means for controlling at least one of the sound-to-direct energy ratio or the interaural cross-correlation coefficient, and an acoustic signal outputting means for outputting a control signal at this output level control means.

That is, a first aspect of the present invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound. The acoustic signal input from an acoustic signal input means for receiving the acoustic signal. A reverberation component is created from the reverberation component, and the reverberation component is added to the acoustic signal by the reverberation adding means. Then, the voltage level of the output signal from the reverberation adding means is adjusted by the output level adjusting means, and the adjusted output signal is output by the acoustic signal output means.

A second aspect of the present invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound. The acoustic signal input from an acoustic signal input means for receiving the acoustic signal. A reverberation component is created from the reverberation component, and the reverberation component is added to the acoustic signal by the reverberation adding means. Next, the voltage level of the output signal from the reverberation adding means is adjusted by the output level adjusting means, and when the adjusted voltage level of the output signal is equal to or higher than the preset voltage level and is output over a preset time. The maximum output control signal generating means outputs the control signal. Then, according to the output of the maximum output control signal generating means, at least one of the voltage level of the signal output from the output level adjusting means, the reverberation-to-direct sound energy ratio, or the interaural cross-correlation coefficient is set. It is controlled by the output level control means, and the controlled signal is output from the acoustic signal output means.

A third aspect of the present invention is an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound. The acoustic signal input from the acoustic signal input means for receiving the acoustic signal. A reverberation component is created from the reverberation component, and the reverberation component is added to the acoustic signal by the reverberation adding means. Next, while adjusting the voltage level of the output signal from the reverberation adding means by the output level adjusting means, the sound pressure is measured by the ear canal sound pressure measuring means arranged in the ear canal or near the ear canal entrance, and the sound at this time is measured. When the pressure value is equal to or higher than the preset sound pressure value and is output over a preset time, the maximum output control signal generating means outputs the control signal. Then, according to the output of the maximum output control signal generating means, at least one of the voltage level of the output signal output from the output level adjusting means, the reverberation-to-direct energy ratio, or the interaural cross-correlation coefficient. Is controlled by the output level control means, and the controlled signal is output from the acoustic signal output means.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of the present embodiment will be described. When you listen to the sound of music etc. with headphones, an unnatural state occurs where you can hear the sound in your head or in your ears. This is called intracranial localization. One way to solve this is
There is a method of adding a reverberation sound component to the original sound so that the sound can be heard from outside the head. This is called out-of-head localization.

As described above, it is known that there is a certain kind of relation between the out-of-head localization and the addition of reverberation, but until now, regarding the relation between the addition of reverberation and the psychological loudness, No consideration was given.

Therefore, as a result of conducting an experiment paying attention to this point, the present applicant found out that there is the following relationship between the addition of reverberation and the psychological loudness. Hereinafter, such an experiment will be described in detail.

In FIG. 1, 101 is a sound source, 102L,
102R is a reverberation adding device, 103L and 103R are attenuators, 104 is an input switching device, and 105 is a headphone. In the experiment, the loudness of the sound when the sound of the sound source (original sound) was directly heard was compared with the loudness of the sound when the reverberation component was added to the original sound (reverberation sound). That is, the examinee switches the input switching device 104 to 2
After listening to the sounds, the levels of the reverberation-added sounds were adjusted by the attenuators 103L and 103R so that the loudnesses were equal.

The experimental results are summarized and shown in FIG. In FIG. 2, the horizontal axis represents the energy ratio E _{r / d} of the reverberant sound to the direct sound, and the vertical axis represents the change in the sound pressure level and the psychological change in the sound pressure level. The solid line is the sound pressure level raised by adding reverberation to the original sound, and the one-dot chain line and two-dot chain line add reverberation components with interaural cross-correlation coefficient φ of 0.7 and 1.0, respectively. It shows the psychological change of the sound pressure level raised by doing. Here, the energy ratio E _{r / d} of the direct sound to the reverberant sound is defined by the following equation.

[0018]

(Equation 1)

It can be seen from FIG. 2 that the addition of the reverberation component raises the physical sound pressure level as shown by the solid line, but psychologically the sound can be heard louder than that. This indicates that the tendency is stronger when the interaural cross-correlation coefficient is lower.

From this, it can be seen that even if the sound pressure level is the same, the sound is heard louder in the human ear when the reverberation added sound is heard than when only the original sound is heard. Thus, when the original sound and the reverberation added sound are heard with the same sound volume, the sound pressure level of the reverberation added sound can be lowered.
The present embodiment focuses on this point.

The first embodiment of the present invention will be described in detail below. In the first embodiment, as shown in FIG. 3, a monaural signal source 1, an acoustic signal input means 1a, an acoustic signal output means 1b, reverberation adding means 2L and 2R, and output level adjusting means 3L and 3R, It is composed of headphones 4.

FIG. 4 is a diagram showing a specific circuit configuration of the reverberation adding means 2L and 2R. The amplifier 21 and the delay element 22 are shown in FIG.
And subtractors 23 and 24. In the figure, G indicates the amplification degree. The interaural cross-correlation coefficient φ of the signal output from such a circuit is expressed by the following equation.

Φ = (3G ² -1) / (1 + G ² ) When the amplification degree G of the amplifier is 1, the output signal is only the direct sound component, and therefore the energy ratio E _r of the direct sound to the reverberant sound. _{/ d} = 0, and the interaural cross-correlation coefficient φ = 1. When the amplification factor G is 0.6, the energy ratio E of direct sound to reverberant sound is
_{r / d} becomes maximum and the interaural cross-correlation coefficient φ = 0.
In the present embodiment, the amplification degree of the amplifier is set so that the reverberant sound to direct sound energy ratio E _{r / d} is about 2.0 and the interaural cross-correlation coefficient φ is about 0.7.

According to the first embodiment, the reverberation sound adding means 2
By adding a reverberation sound by L and 2R, a louder sound can be heard psychologically.
As a result, the output level of the headphones 4 can be suppressed to a low level, so that it is possible to prevent an excessive load from being applied to the human ear. At the same time, the problem of in-head localization, which is peculiar to listening to headphones, is solved, and the effect of eliminating the feeling of strangeness and oppression is also achieved.

In the first embodiment described above, the signal source 1
Although the monaural case is assumed as the above, a signal source of two channels or more channels may be used. Also,
The interaural cross-correlation coefficient φ has been described as being set to about 0.7, but it may be any other value, or 1.0.
In this case, the effect of psychologically increasing the sound is slightly reduced, but there is an advantage that the configuration can be simplified as shown in FIG.

Further, as the reverberation adding means 2L and 2R,
It may have a reverberation characteristic in a real space as shown in FIG. 6 as a transfer characteristic. The reverberation adding means 2L shown in FIG.
The 2R is composed of a convolution operation means 25 and a memory 26. Reverberation characteristics measured in an arbitrary real space are given to the memory 26 in advance as transfer characteristics. In this case, instead of measuring in the real space, the one obtained by simulation may be used.

The acoustic transducer may be, for example, a speaker mounted on the headrest of the sofa, other than the headphones 4 described above. FIG. 7 is a diagram showing the configuration of the second embodiment of the present invention, in which a signal source 1 based on stereo sound is used.
, Acoustic signal input means 1a, and acoustic signal output signal 1b
, Reverberation adding means 2L and 2R, and output level adjusting means 3
L, 3R and maximum output control signal generating means 5a
And headphones 4.

Maximum output control signal generating means 5a
Outputs a predetermined control signal when the output of the output level adjusting means 3L, 3R exceeds a preset level and time. This set level is obtained from the relationship between the voltage of the signal applied to the headphones 4 and the sound pressure level presented by the headphones 4, and is, for example, a sound pressure level that is not noisy and does not adversely affect the ears. A voltage value will do.

The control signal from the maximum output control signal generating means 5a is output level adjusting means 3L, 3R.
Alternatively, it is supplied to the reverberation adding means 2L, 2R, which controls at least one of the output level of the output level adjusting means 3L, 3R, the energy ratio of the direct sound to the reverberant sound, or the interaural cross-correlation coefficient.

According to the second embodiment, since the output level to be output is adjusted according to the preset condition, it is possible to prevent an excessive load from being applied to the ear. Particularly, since the reverberation sound is added, the output level can be further lowered and the burden on the ear can be further reduced.

In the second embodiment, the control signal is generated by using the signal of one channel to control the signals of both channels. However, of course, the control signal is generated based on the signals of both channels. You may let it control.

FIG. 8 is a diagram showing the configuration of the third embodiment, which is a stereophonic signal source 1, an acoustic signal input means 1a, an acoustic signal output means 1b, and a reverberation adding means 2L,
2R, output level adjusting means 3L, 3R, a microphone 6 which is a sound pressure measuring means, a maximum output control signal generating means 5a, and a headphone 4.

The microphone 6 is placed in the ear canal of the human ear,
For example, they are arranged as shown in FIG. FIG.
(A) shows how the microphone 6 supported by the headphones 4 measures the sound pressure at the entrance of the external auditory meatus 20 adjacent to the auricle 21.

Maximum output control signal generating means 5a
Outputs a control signal when the sound pressure input to the microphone 6 exceeds a preset level and time. The set level at this time is a value such that the sound pressure level is not noisy and does not adversely affect the ears, and is about 80 dB, for example.

The control signal from the maximum output control signal generating means 5a is output level adjusting means 3L, 3R.
Alternatively, it is supplied to the reverberation adding means 2L, 2R to control at least one of the output level of the output level adjusting means 3L, 3R, the energy ratio of the direct sound to the reverberant sound, or the interaural cross correlation coefficient.

As described above, in the third embodiment, since the output level to be output is adjusted according to the preset condition, it is possible to prevent the ear from being excessively loaded. Particularly, since the reverberation sound is added, the output level can be further lowered and the load on the ear can be further reduced. In addition, the problem of in-head localization, which is peculiar to listening to headphones, is solved, and there is an effect that a feeling of discomfort and pressure is eliminated.

The sound pressure may be measured by the method shown in FIG. 9 (b). In FIG. 9B, the microphone 6
The ring-shaped microphone holder 6a provided with is attached to the ear canal 20 to measure the sound pressure inside the ear canal 20.

FIG. 10 is a diagram showing the configuration of the fourth embodiment of the present invention, which is a stereophonic signal source 1, an acoustic signal input means 1a, an acoustic signal output means 1b, and reverberation adding means 2L and 2R. The output level adjusting means 3L and 3R, the noise input microphone 7, the noise control signal generating means 5b, and the headphones 4 are included.

The noise control signal generating means 5b outputs a control signal according to the noise detected by the noise input microphone 7. This control signal is output level adjusting means 3L, 3R or reverberation adding means 2L,
It is supplied to 2R. According to the output control signal, the output levels of the output level adjusting means 3L and 3R,
At least one of the direct-to-reverberant energy ratio or the interaural cross-correlation coefficient is controlled.

According to the fourth embodiment described above, the output level is adjusted according to the ambient noise, so that the user can always listen to the sound with an appropriate sound volume.
In particular, even when listening in a noisy place, since the reverberation sound is added, even if the output level is small, it can be heard psychologically, so that the load on the ear can be reduced.

FIG. 11 is a diagram showing the configuration of the fifth embodiment of the present invention, which is a stereophonic signal source 1, an acoustic signal input means 1a, an acoustic signal output means 1b, and reverberation adding means 2L and 2R. , Output level adjusting means 3L, 3R, a microphone 6, a cumulative output control signal generating means 5c, an alarm sound presenting means 8, an adding means 9, and a headphone 4, and the microphone 6 is arranged in the ear canal. There is.

Cumulative output control signal generating means 5c
Integrates the sound pressure near the ear canal 20 detected by the microphone 6. The value is reset in advance at the start of use. Then, when the integral calculation value becomes larger than a preset value, the control signal is output. The alarm sound presenting means 8 generates and outputs a warning sound according to the control signal. Although not shown, this warning sound is stopped by pressing a warning sound cancel button, for example.
Further, the length of the warning sound may be set in advance, and the warning sound may be automatically stopped after the elapse of the set time.

As described above, in the fifth embodiment, a warning sound is issued to instruct the user to rest his / her ears according to the usage situation. Particularly, since the sound pressure is integrated here, the usage time is short. However, when the user increases the output level and uses it, a warning sound is output early, and an instruction according to the usage situation can be issued. Therefore, it is possible to prevent an excessive load from being applied to the ear by continuous use for a long time.

The alarm is generated by the alarm sound presenting means 8
Instead, the alarm display means 10 as shown in FIG. 12 may be used. The display at this time may be lamp lighting, panel display, or the like. Further, the calculation of the sound pressure in the cumulative output control signal generating means 5c may be other than the integral calculation as long as it is a value calculated using two variables of the sound pressure and the time. Further, as shown in FIG. 13, the control signal may be obtained by monitoring the voltage output from the output level adjusting means 3L, 3R.

FIG. 14 is a diagram showing the configuration of the sixth embodiment of the present invention, which is a stereophonic signal source 1, an acoustic signal input means 1a, an acoustic signal output means 1b, and reverberation adding means 2L and 2R. The output level adjusting means 3L and 3R, the microphone 6 which is a sound pressure measuring means, the stop control signal generating means 5d, the switching means 11 and the headphone 4 are arranged, and the microphone 6 is arranged in the vicinity of the ear canal entrance. There is.

The stop control signal generating means 5d integrates the sound pressure detected by the microphone 6 and outputs a control signal when the integrated calculation value becomes larger than a preset value. Then, the switch of the switching means 11 is opened by the control signal from the stop control signal generating means 5d to stop the sound output.

In the above-described sixth embodiment, the sound output is forcibly stopped so that the user can rest his / her ears according to the usage situation.
In particular, since the sound pressure is integrated here, even if the usage time is short, it is possible to give an instruction according to the usage status, such as when the user increases the output level to stop the sound pressure early. Therefore, it is possible to prevent an excessive load from being applied to the ears by continuous use for a long time.

As shown in FIG. 15, the voltage outputted from the output level adjusting means 3L, 3R is monitored and the control signal is outputted from the stop control signal generating means 5d to control the switching means 11. Good. Of course, in order to obtain the control signal, it is not necessary to perform the integral calculation.

The above-described embodiments include inventions having the following configurations. The embodiments and effects of the invention corresponding to the respective configurations are as follows. (Structure 1) In an acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near the ear and outputting the sound, an acoustic signal input means for receiving the acoustic signal and a reverberation component are created from the input acoustic signal. A reverberation adding means for adding to the acoustic signal, an output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and an acoustic signal output means for outputting the adjusted output signal. A characteristic acoustic signal presenting device. (Corresponding Embodiment of the Invention) The first embodiment corresponds to the embodiment relating to the present invention. (Effect) According to the present invention, the psychological loudness can be increased by adding the reverberation sound. As a result, the output of the headphones can be lowered, so that an excessive load is not applied to the ears and headphone hearing loss can be prevented. In addition, the problem of in-head localization, which is peculiar to listening to headphones, is solved, and the effect of eliminating discomfort and pressure is also obtained. (Structure 2) In an acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, an acoustic signal input means for receiving the acoustic signal and a reverberation component are created from the input acoustic signal. Reverberation adding means for adding to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and voltage level of the output signal output from the output level adjusting means is a preset voltage. Maximum output control signal generating means for outputting a control signal when the output exceeds the preset time over the level, and is output from the output level adjusting means according to the output of the maximum output control signal generating means. Output level that controls at least one of the voltage level of the signal or the reverberation-to-sound energy ratio or the interaural cross-correlation coefficient And control means, an acoustic signal presenting apparatus characterized by comprising a sound signal output means for outputting a control signal at this output level control means. (Corresponding Embodiment of the Invention) The second, third, and fourth embodiments correspond to the embodiment relating to the present invention. (Effect) No signal is output from the acoustic signal output means over a preset level and time, and a psychological volume is increased by adding a reverberation sound. The output can be lowered. As a result, excessive load is not applied to the ears, and it is possible to prevent headphone hearing loss. (Structure 3) In an acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, an acoustic signal input means for receiving the acoustic signal and a reverberation component are created from the input acoustic signal. Reverberation means for adding to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from the reverberation means, and ear canal sound pressure measurement for measuring sound pressure in the ear canal or near the ear canal entrance Means and a maximum output control signal generating means for outputting a control signal when the sound pressure value output from the ear canal sound pressure measuring means is equal to or higher than a preset sound pressure value and is output over a preset time, Depending on the output of the maximum output control signal generating means, the voltage level of the output signal output from the output level adjusting means or the reverberant sound to direct energy ratio Or an output level control means for controlling at least one of the interaural cross-correlation coefficients, and an acoustic signal output means for outputting a signal controlled by the output level control means. Acoustic signal presentation device. (Corresponding Embodiment of the Invention) The third embodiment corresponds to the embodiment relating to the present invention. (Effect) Since the sound pressure is directly monitored, it is not necessary to previously obtain the input voltage-output sound pressure characteristic of the acoustic transducer, so that there is no limitation on the acoustic transducer that can be used.
Moreover, since the sound pressure is directly measured, accurate control is possible. (Structure 4) In an acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, an acoustic signal input means for receiving the acoustic signal and a reverberation component signal from the input acoustic signal And reverberation adding means for adding to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, a noise input microphone for measuring the noise around the headphones, and this noise input microphone. And a noise control signal generating means for outputting a control signal according to a comparison result by comparing a signal output from the device with a preset reference value, the output according to the output of the noise control signal generating means. Of the voltage level of the signal output from the level adjusting means or the reverberant sound to direct sound energy ratio or the interaural cross correlation coefficient Acoustic signal displaying apparatus, characterized by controlling one even without. (Corresponding Embodiment of the Invention) The embodiment of the present invention corresponds to the fourth embodiment. (Effect) Since the output level to be output is adjusted according to the ambient noise, the user can always listen to the sound with an appropriate volume. In particular, even when listening in a noisy place, it is possible to prevent an excessive load from being placed on the ears, because even if the output level is lower than the reverberation sound is added, the audible amount is heard. (Structure 5) An acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near the ear and outputting the sound, and an acoustic signal input means for receiving the acoustic signal and a reverberation component signal from the input acoustic signal. The reverberation adding means for adding to the acoustic signal, the output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and the cumulative value of the physical quantity of the signal output from the output level adjusting means. ,
Cumulative output control signal generating means for outputting a control signal when the cumulative value exceeds a preset amount;
An alarm signal presenting means for issuing a warning according to the output of the cumulative output control signal producing means. (Corresponding Embodiment of the Invention) The fifth embodiment corresponds to the embodiment relating to the present invention.

The alarm presenting means corresponds to the alarm sound presenting means 8 in FIG. 11, but also includes the alarm display means 10 as shown in FIG. Further, the physical quantity monitored by the cumulative output control signal generation means 5c includes the voltage value output from the acoustic signal output means 1b shown in FIG. (Effect) A warning sound can be output according to the usage status. For example, even when the usage time is short, the warning sound is output early when the user uses the output level at a high level. Therefore, it is possible to prevent an excessive load from being applied to the ear by continuous use for a long time. (Structure 6) In an acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near the ear and outputting the sound, an acoustic signal input means for receiving the acoustic signal and a reverberation component signal from the input acoustic signal The reverberation adding means for adding to the acoustic signal, the output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and the cumulative value of the physical quantity of the signal output from the output level adjusting means. ,
Cumulative output control signal generating means for outputting a control signal when the cumulative value exceeds a preset amount;
An acoustic signal presenting apparatus comprising: a switching unit that stops the output from the acoustic signal output unit according to the output of the cumulative output control signal generation unit. (Corresponding Embodiment of the Invention) The sixth embodiment corresponds to the embodiment relating to the present invention.

The cumulative output control signal generating means 5
The physical quantity monitored by d includes the voltage value output from the acoustic signal output means 1b shown in FIG. (Effect) A warning sound can be output according to the usage status. For example, even when the usage time is short, the warning sound is output early when the user uses the output level at a high level. Therefore, it is possible to prevent an excessive load from being applied to the ear by continuous use for a long time. (Structure 7) The acoustic converter receives acoustic signal input means for receiving an acoustic signal, conversion means for converting the acoustic signal input to the acoustic signal input means into sound, and sound pressure in the ear canal or near the ear canal entrance. 7. The acoustic signal presenting apparatus according to any one of configurations 1 to 6, further comprising: an ear canal sound pressure measuring unit for measuring. (Corresponding Embodiment of the Invention) As an embodiment relating to the present invention, the embodiment of FIG. 9A corresponds. In the embodiment of the invention, the microphone corresponds to the external auditory meatus sound pressure measuring means. (Effect) It is possible to stably measure the sound pressure.

[0052]

According to the present invention, the sound pressure level is adjusted in consideration of not only physical sound but also psychological sound volume, so that an excessive load is applied to the human ear. It is possible to prevent hearing loss.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the outline of the present invention.

FIG. 2 is a diagram showing a relationship between an energy ratio of reverberant sound to direct sound, a change in sound pressure level, and a psychological change in sound pressure level.

FIG. 3 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a specific configuration of reverberation adding means.

FIG. 5 is a diagram showing a simplified configuration of the first embodiment.

FIG. 6 is a diagram showing another configuration of reverberation adding means.

FIG. 7 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 9 is a diagram showing how the sound pressure at the entrance of the ear canal is measured by a microphone.

FIG. 10 is a diagram showing a configuration of a fourth exemplary embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a fifth exemplary embodiment of the present invention.

FIG. 12 is a diagram showing a modified example of the fifth embodiment.

FIG. 13 is a diagram showing another modification of the fifth embodiment.

FIG. 14 is a diagram showing a configuration of a sixth embodiment of the present invention.

FIG. 15 is a diagram showing a modified example of the sixth embodiment.

[Explanation of symbols]

101 ... Sound source, 102L, 102R ... Reverberation adding device, 1
03L, 103R ... Attenuator, 104 ... Input switching device, 105 ... Headphones.

Claims (3)

[Claims] 1. An acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, wherein an acoustic signal input means for receiving the acoustic signal and a reverberation component is created from the input acoustic signal. And reverberation adding means for adding to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and acoustic signal output means for outputting the adjusted output signal. An acoustic signal presenting device characterized by: 2. An acoustic signal presenting device for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, wherein an acoustic signal input means for receiving the acoustic signal and a reverberation component are created from the input acoustic signal. Reverberation adding means for adding to the acoustic signal, output level adjusting means for adjusting the voltage level of the output signal from the reverberation adding means, and voltage level of the output signal output from the output level adjusting means are preset. Maximum output control signal generating means for outputting a control signal when the voltage is output at a voltage level or higher for a preset time, and output from the output level adjusting means according to the output of the maximum output control signal generating means. Outputs that control at least one of the voltage level of the signal or the reverberation-to-sound energy ratio or the interaural cross-correlation coefficient And Bell control unit, the audio signal presenting apparatus characterized by comprising a sound signal output means for outputting a control signal at this output level control means. 3. An acoustic signal presenting apparatus for converting an acoustic signal into a sound by an acoustic transducer arranged near an ear and outputting the sound, wherein an acoustic signal input means for receiving the acoustic signal and a reverberation component is created from the inputted acoustic signal. Reverberation adding means for adjusting the voltage level of the output signal from the reverberation adding means, and an ear canal sound pressure for measuring sound pressure inside or near the entrance of the ear canal. Measuring means, and a maximum output control signal generating means for outputting a control signal when the sound pressure value output from the ear canal sound pressure measuring means is equal to or greater than a preset sound pressure value and is output for a preset time. Depending on the output of the maximum output control signal generating means, the voltage level of the output signal output from the output level adjusting means or the reverberant sound direct energy The output level control means for controlling at least one of the Gee ratio or the binaural cross-correlation coefficient, and the acoustic signal output means for outputting the signal controlled by the output level control means. Device for presenting an acoustic signal.