KR101069687B1 - Mobile audio equipment preventing hearing loss and control method thereof - Google Patents

Abstract

In the present invention, in order to prevent hearing damage that may occur when excessively exposed to harmful levels of sound pressure from the portable acoustic terminal, if the sound pressure heard by the earphones when the sound pressure exceeds 80dB or more harmful sound pressure threshold when the sound pressure is exceeded for more than that time Accumulated harmful sound pressure is not accumulated if it is less than the threshold, and daily use remaining time according to harmful sound pressure exposure level by using accumulated mean sound pressure average value and accumulated exposure time from the accumulated start time of harmful sound pressure accumulated time period Automatically calculates and displays to the user through the display unit and provides a warning message visually and audibly at the time of warning.If the cumulative sound pressure exceeds the medical daily exposure time, use the audio terminal for 12 hours (if necessary). Up to 24 hours) forcing the user to It is excessively exposed to harmful levels of sound pressure from earphones or headphones of the device to actively prevent the hearing loss that may be caused.

Description

Portable audio terminal with hearing damage prevention function and its control method {MOBILE AUDIO EQUIPMENT PREVENTING HEARING LOSS AND CONTROL METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic terminal apparatus, and more particularly, to a portable acoustic terminal having a hearing damage prevention function and a control method thereof for actively preventing noise-induced hearing loss caused by continuous exposure to high sound pressure.

Recently, the number of people diagnosed with 'noise deafness' is steadily increasing due to excessive use of personal audio equipment such as MP3, PMP, mobile phones, etc. Among them, teenagers are looking for medical institutions with noise deafness. Medically, noise-induced hearing loss refers to permanent hearing impairment due to hearing cell damage caused by repeated exposure to noise. In 2009, the EU Commission on New Health Risk Factors warned that 5-10% of people may experience permanent hearing loss if they listen to music at high volume for more than one hour and five years each day.

When you're listening to music on your earphones when you're on the subway or on a bus, your ears are exposed to at least 90dB of strong sound. If you listen to music loudly with earphones for a long time, the risk of hearing loss increases, but users are not aware of it, and even if they know it, they become more likely to develop noise-induced hearing loss.

Since most of the users of personal audio equipment are teenagers, they are less likely to be exposed to strong sounds for a long time because they are less aware of the possibility of hearing damage, and when tinnitus and hearing loss symptoms begin to appear, they are already permanently damaged and treatment is virtually impossible. . Noise-induced hearing loss due to constant exposure to strong sound is caused by loss of inner ear nerve cells, and once damaged, nerve cells are not regenerated, so hearing loss lasts for a lifetime.

Therefore, most importantly, prevention is the best way to avoid overexposure to harmful levels of strong sound before permanent hearing damage occurs.

Accordingly, an object of the present invention is to provide a portable acoustic terminal and a method of controlling the same, which can actively prevent hearing damage caused by listening to a portable acoustic device with strong sound while wearing earphones or headphones.

It is another object of the present invention to provide a portable acoustic terminal and a control method thereof for preventing noise-induced hearing loss according to the use of the portable acoustic device and the resulting living disorder.

According to the above object, the present invention, in the audio terminal, a sound source storage unit for storing various sound sources including music, an audio processor for audio processing the sound source output from the sound source storage unit, the earphone can be connected, the audio processor An audio output unit for providing audio data output from the audio signal as an audible sound, a sound pressure detection unit for detecting sound pressure of the audible sound output from the audio output unit, a memory for storing a harmful sound pressure accumulation time interval and a cumulative start time under predetermined control, and The display unit displays daily usage time and hearing guidance message that fluctuates according to the accumulation of sound pressure, and when the sound pressure detected by the sound pressure detector exceeds the preset harmful sound pressure threshold value, the harmful sound pressure is accumulated for a longer time, and the preset accumulation start is performed. The cumulative level of harmful sound pressure from the time and the cumulative exposure time are calculated and at the same level as the current sound pressure. Calculate the medically acceptable daily use remaining time in continuous exposure to the sound of the instrument and display the daily use remaining time on the display and if the cumulative harmful pressure exceeds the medical daily exposure allowance time, the user is forced to play the sound source for 12 hours or one day. The controller is configured to stop.

The present invention also provides a control method for preventing hearing damage in a portable sound terminal having a hearing damage prevention function, comprising: a first process of checking a current sound pressure of an audible sound output from an audio output unit of a portable sound terminal which is playing a sound source; And a second process of determining whether the check sound pressure exceeds a preset nominal sound pressure threshold, and accumulating the noxious sound pressure for a time exceeding the threshold as the check sound pressure exceeds the nominal sound pressure threshold and causing harmful from the preset cumulative start time. The third process of calculating the daily cumulative amount of harmful sound pressure and daily use remaining time by using the sound pressure average value and cumulative exposure time, and displaying the daily use remaining time which changes frequently from the display part, and at the time of warning, the warning message is displayed visually and 4th process provided by at least one of audible and cumulative harmful pressure As a time exceeding the allowable time is characterized in that the fifth step of forcibly stopping the reproduction of the sound source of the terminal for 12 hours to one day.

The present invention performs a control for the prevention of hearing damage in the portable acoustic terminal having a hearing damage prevention function, so as not to be excessively exposed to harmful levels of strong sound before permanent hearing damage appears and as a result noise There is an advantage to prevent.

1 is a block diagram of a portable acoustic terminal applied to an embodiment of the present invention;
2 is a control flowchart for setting a cumulative start time of harmful sound pressure in an embodiment of the present invention;
3 is a control flowchart for preventing hearing damage in a portable acoustic terminal according to an embodiment of the present invention;
4A to 4C are exemplary diagrams for providing a guide message through a display unit of a portable acoustic terminal of the present invention;
5 and 6 are views for explaining that the medical daily exposure allowable time for the harmful sound pressure and the harmful sound pressure cumulative amount is linked.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In order to actively reduce noise-induced hearing loss, a medical understanding of human ear structure and ear disease is necessary.

The ear bones (consisting of three very small bones) in the eardrum and middle ear of the human ear are like audio amplifiers and amplify the sound. This amplified sound is transmitted back to the cochlea in the inner ear, where tens of thousands of tiny 'hair cells' (also called 'hearing cells') convert physical energy called sound waves into electrical signals. Play a role. If the number of the hair cells (aural cells) decreases or is damaged due to aging or noise-induced hearing loss, it is impossible to detect them even if a sound comes in. Dead hair cells are not recoverable, but hair cells that have not yet died and have fallen off may be recovered by stimulation such as sound conditioning treatment, and deteriorated hair cells are no longer exposed to noise when temporarily exposed to severe noise. Doing so will help you recover and have a normal hearing.

However, repeated and sustained exposure to loud noises leads to the death and damage of more and more hair cells, resulting in permanent loss of hearing and never recovering.

Article 6 of the Enforcement Regulations of the Occupational Safety and Health Act specifies the maximum value of workplace environmental noise exposure in the noise exposure allowance standard as follows.

Daily exposure time: Noise sound pressure [dB (A)]

8 hours: 90 dB, 6 hours: 92 dB, 4 hours: 95 dB, 3 hours: 97 dB, 2 hours: 90 dB, 1 hour: 105 dB, 0.5 hour: 110 dB, 0.25 hour: 115 dB

The ear can be permanently deaf after 8 hours of exposure to sounds above 85 dB. Even when noise satisfying 90dB (A), ISO reported that about 18% can cause hearing loss due to noise at 85dB (A), and EPA (US Environmental Protection Agency) The NOISH (Occupational Safety and Health Research Institute of the US Bureau of Disease Control and Control) suggests that there is a risk of 3 to 5% even at 80 dB.

In addition, hearing loss by noise has an accumulation effect. When hearing loss occurs in adolescence, noise hearing loss and naturally occurring senile hearing loss overlap with seniors and old people who have to live much social life 20 to 30 years later. In other words, with hearing loss that occurs naturally due to aging, hearing loss becomes more severe.

Therefore, in the present invention, it is possible to reduce the sound pressure environment that can be caused by hearing loss as much as possible and to enable the user to use a portable audio terminal at will, and to minimize the effect of hearing loss due to noise, and also to reduce the function of the hair cells (aural Cells) can be recovered.

The main examples are as follows.

(1) In the present invention, the sound pressure and time are accumulated only for sound pressures of 80 dB or more that may cause hearing loss, but not for sound pressures of 80 dB or less. In the specification of the present invention, since there is a probability of causing hearing loss, cumulative sound pressure of 80 dB or more will be referred to as 'harmful sound pressure'.

(2) In the present invention, the use of the portable acoustic terminal 4 when the harmful sound pressure, for example, 115 dB or more, more preferably 120 dB or more, which is a harmful sound pressure that can cause hearing loss within a short time upon exposure of several tens of seconds to a few minutes, is output to the earphone. Pause).

(3) In the present invention, the cumulative start time for the harmful sound pressure can be determined through default setting or user function setting, and 24 hours from the cumulative start time are defined as the cumulative sound pressure cumulative time period.

(4) If the user accumulates the harmful sound pressure accumulated in his portable audio terminal (or the remaining daily use time) exceeds the medical daily exposure allowable time, the portable audio terminal 4 Use (sound playback) is forced off for 12 to 24 hours.

In the present invention, the medical daily exposure allowable time for the harmful sound pressure is variable in conjunction with the cumulative amount of the negative sound pressure as shown in FIGS. 5 and 6.

Although listening to the sound source at a low sound pressure is generally performed as shown in (a) of FIG. 5, the medical daily exposure allowable time becomes long as shown in FIG. Will also be long. However, if the earphone is listened to the sound source with harmful high sound pressure as shown in (a) of FIG. 6, the medical daily exposure allowable time becomes relatively shorter as shown in FIG. Will be shortened.

1 is a block diagram of a portable acoustic terminal 2 according to an embodiment of the present invention, which includes a control unit 4, an input unit 6, a display unit 8, a vibration unit 10, a memory 12, and a sound source. It comprises a storage unit 14, an audio processing unit 16, an audio output unit 18, a sound pressure detection unit 20.

The control unit 4 controls the overall operation for performing the hearing damage prevention function according to the present invention. The input unit 6 may be a means for the user to input for interface with the controller 4 such as a key button, a function button, a volume controller, a touch screen, and the display unit 8 is visible to the user under the control of the controller 4. Is a means of providing a message. The vibrator 10 is a means for vibrating so that a user can notice under the control of the controller 4.

The memory 12 stores various data and programs for the hearing damage prevention function of the present invention. The sound source storage unit 14 may be various sound sources such as music or language information such as songs, pop songs, and classical music. If the portable audio terminal 2 is a cassette tape player or a disc player such as a CD or a DVD, the sound storage unit 14 may be a recording medium such as a cassette tape or a disc.

The audio processor 16 processes the audio stored in the sound source storage unit 14 under the control of the controller 4, and the audio output unit 18 includes a channel amplifier, a volume control unit, an output port, and the like. Audio data output from the audio processor 16 is controlled through earphones, headphones, speakers, and the like under the control of the control panel). The sound pressure detector 20 detects the sound pressure of the audible sound generated by the audio output unit 18 and applies the sound pressure value to the controller 4. Sound pressure detection of an audible sound can be obtained by using a known algorithm of equivalent noise level (Equivalnet Noise Level).

2 is a control flowchart performed by the controller 4 to set the cumulative start time and cumulative time period of the harmful sound pressure according to an exemplary embodiment of the present invention.

In the present invention, the cumulative time period of the harmful sound pressure is set to 24 hours, and the cumulative start time of the harmful sound pressure may be changed to a default setting or a desired time as shown in FIG. 2. This allows the cumulative time interval of harmful sound pressures to fit the lifestyle patterns that may vary from user to user.

More specifically, referring to FIG. 2, in the present invention, as in step 200 of FIG. 2, the cumulative time interval of the harmful sound pressure is set to 24 hours and mapped to the memory 12.

If the user requests to change the cumulative sound pressure start time by using a function key in the input unit 6 of the portable acoustic terminal 2 (step 202 of FIG. 2), the controller 4 proceeds to step 206 of FIG. do. In step 206, the controller 4 causes the cumulative start time to be input to the terminal as the user's final selection through the user interface using the input unit 6 and the display unit 8. Then, in step 208, the cumulative start time is changed. It stores in the memory 12 as a start time.

If the user does not request to change the cumulative start time in the determination of step 202 of FIG. 2, the control unit 4 stores the default setting value in the memory 12 as the cumulative start time as in step 204 of FIG. 2. Keep it as it is. The default setting for the nominal sound pressure accumulation start time is usually set to midnight at bedtime.

As described above, the cumulative start time may be changed by the user's function setting. However, the cumulative start time may be changed after using the acoustic terminal 2 using the earphone. This is to prevent the user from unjustly increasing the daily remaining time by changing the cumulative start time.

Referring to the specific control operation for this, after the cumulative start time is changed by performing step 208 of FIG. 2, if the cumulative start time change request is again made through the input unit 6 (step 210 of FIG. 2), the controller ( 4, the process proceeds to step 212 of FIG. 2 and determines whether there is a cumulative harmful sound pressure according to the sound source regeneration based on the changed cumulative start time.

If the harmful sound pressure is accumulated, the controller 4 proceeds to step 214 of FIG. 2. In step 214 of FIG. 2, the user recognizes that the change is impossible until 24 hours have elapsed from the changed start time, and does not accept any further input. To provide.

However, if the harmful sound pressure of 80 dB or more is not accumulated at all in the judgment at step 212 of FIG. 2, the control unit 4 returns to step 206 of FIG. 2 to perform the steps therefrom so as to change the harmful sound pressure accumulation start time again. Do it.

3 is a control flowchart for preventing hearing damage in the control unit 4 in the portable audio terminal 2 according to an embodiment of the present invention, Figures 4a to 4c is a display unit 8 of the portable audio terminal 2 of the present invention. An example of providing a guide message through).

Now, with reference to Figures 3 and 4a to 4c will be described in more detail the operation for preventing hearing damage in the present invention.

When the user plays a sound source such as music using the portable audio terminal 2 with the earphone plugged in, as shown in step 300 of FIG. 3, the controller 4 reads the current sound pressure from the audio output unit 18. It checks at a set sampling period, for example, 1/16 to 1 second, and displays the average sound pressure per unit time as the current sound pressure value on the display unit 8 (step 302 of FIG. 3). The current sound pressure value in the audio output unit 18 is almost the same as the sound pressure value transmitted by the user through the earphone.

In the average sound pressure value per unit time for displaying the current sound pressure value, the unit time may be several seconds to several tens of seconds. For example, as shown in FIG. 4A, the display unit 8 is formed by overlapping the touch screen with the touch screen. It is preferable to display the sound pressure value information 42 such as '60 dB 'directly under the volume controller 40 in the display unit.

After performing step 302 of FIG. 3, the controller 4 proceeds to step 304 of FIG. 3 to determine whether the sound pressure checked in step 302 of FIG. 3 exceeds 80 dB, which is a preset noisy sound pressure threshold.

If the checked sound pressure exceeds 80 dB, the control unit 4 performs step 306 of FIG. 3 first before performing the procedure of step 310 of FIG. 3, for example, 120 dB in which the check sound pressure becomes a criterion for determining excessive harmful sound pressure. Judge whether it is abnormal.

If more than 120dB, the user's hearing may be immediately abnormal within a few minutes, the control unit 4 proceeds to step 308 of FIG. 3 immediately stops the sound source playback (use) of the portable audio terminal 4 and at the same time the user's hearing In order to prevent damage, the user is informed via the display unit 8, etc., indicating that the use is stopped. For reference, the operating noise of car centers and car washes is around 110dB, and the noise from nightclubs is about 115dB.

However, if the checked sound pressure does not exceed 120 dB, the controller 4 directly proceeds from step 302 of FIG. 3 to step 310 of FIG. 3 without going through steps 308 and 310 of FIG. 3.

In step 310 of FIG. 3, the controller 4 regards the check sound pressure exceeding the nominal sound pressure threshold of 80 dB as the nominal sound pressure and accumulates the nominal sound pressure for a longer time, and at the same time, the nominal sound pressure average value accumulated from the preset nominal sound pressure accumulation start time and Calculate the cumulative exposure time. In operation 312 of FIG. 3, the cumulative amount of harmful sound pressure and the daily remaining time in the acoustic terminal 2 are calculated using the mean sound pressure average value and the cumulative exposure time.

In the present invention, the 5dB (A) rule as shown in Table 1 below is preferably applied to reduce the allowable time to 1/2 when the harmful sound pressure increases by 5 dB based on 8 hours. The table in Table 1 is stored in the memory 12 in the present invention.

1 day exposure time [hr] Sound Pressure [dB (A)] 8 85 4 90 2 95 One 100 1/2 105 1/4 110

Referring to Table 1, for example, a simple example of calculating the daily harmful sound pressure amount, the user listens to the portable audio terminal 2 for 1 hour (2 hours exposure exposure time) at the 95 dB (A) noisy sound pressure level, and the 90 dB ( A) If 2 hours (exposure allowable time is 4 hours) at the nominal sound pressure level, the daily nominal sound pressure accumulation amount is 1/2 + 2/4 = 1, and the limit value "1" is reached. In other words, the limit of exposure of harmful sound pressure was reached to prevent hearing damage.

If the limit value is not reached, the expected daily remaining time is calculated based on the cumulative daily harmful sound pressure level, but medically acceptable when exposed to sound at a level similar to the current sound pressure corresponding to the user's current listening volume. Calculate daily usage time.

After performing step 312 of FIG. 3, the control unit 4 proceeds to step 314 of FIG. 3 and displays the expected daily use remaining time in the acoustic terminal 2 obtained in step 312 on the display unit 8 from time to time. At the time of warning, a warning message is provided to the user both visually and audibly.

For example, as shown in FIGS. 4A to 4C, when the sound source is being reproduced, the remaining daily use time of the audio terminal 2 is schematically displayed on the upper right side on the display unit 8 in the form of a bar bar 50, and is always displayed, and a predetermined warning. At this point, a warning message, “beep,” and a warning message “the current medical allowance time for the prevention of hearing loss is 30 minutes remaining” as shown in FIG. 4B may be displayed on the display unit 8.

And if the user continues to listen to the sound source in the harmful sound pressure state exceeding the harmful sound pressure threshold through the earphone of the acoustic terminal (2) in step 316 of Figure 3 determines whether the cumulative sound pressure exceeds the medical daily exposure allowable time, medical daily exposure If the allowable time is not exceeded, the process proceeds to step 320 of FIG. 3.

In operation 320 of FIG. 3, it is determined whether a cumulative sound pressure accumulation time interval (24 hours) has elapsed based on a default setting or a cumulative start time set by a user. If it does not pass, the control unit 4 performs the procedure from step 300 of FIG. 3 again, and if the cumulative harmful pressure time interval has elapsed in step 320 of FIG. 3, the portable acoustic terminal 2 does not become damaged within the range of hearing loss. The controller 4 proceeds to step 322 of FIG. 3 to initialize the daily usage remaining time, the daily harmful sound pressure accumulation amount, the cumulative exposure time, etc. stored in the memory 12.

On the other hand, returning to step 316 of FIG. 3, when the user continues to listen to the sound source in the state of harmful sound pressure and the accumulated harmful sound pressure exceeds the medical daily exposure allowable time, the controller 4 proceeds to step 138 of FIG. 3. The noise level on the bus or subway is around 70 ~ 90dB, so when users listen to portable audio devices such as MP3 players in these places, they can raise the volume higher than the noise from the surroundings and quickly reduce the expected daily usage time. Can be.

As the control unit 4 recognizes that the medical daily exposure allowable time has been exceeded (no remaining daily use time), a guide message for stopping the use of the portable audio terminal 2 in step 138 of FIG. 3 is visible as shown in FIG. 4C. And for 12 hours (up to 24 hours if necessary) forcibly discontinue use of the terminal (reproducing the sound source) so that it can be audibly provided and the user's ear can be recovered. Then, even if the user presses the play button of the portable audio terminal 2 that is forcibly disabled, the control unit 4 prevents the sound source such as music from being programmatically played, and displays the stop guide message to the user. Guide through the back.

As shown in FIG. 4C, an example of the forced stop message is' It is recommended to refrain from using for more than 12 hours to prevent hearing damage. Will be suspended for 12 hours from now. " At this time, since there is no daily use remaining time, the remaining use time bar bar 50 in the display unit 8 shows an empty state.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. The earphone referred to in the present invention is a concept including not only headphones, earbuds, headsets, canal phones, but also their equivalents. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the claims and their equivalents.

(2)-Portable Audio Terminal (4)-Control Unit
(6)-input section (8)-display section
(10)-vibrator (12)-memory
(14)-Sound Recording Unit (16)-Audio Processing Unit
(18)-Audio output part (20)-Sound pressure detection part

Claims (8)

In the audio terminal,
A sound source storage unit for storing various sound sources including music,
An audio processor for audio processing the sound source output from the sound source storage unit;
An audio output unit capable of connecting earphones and providing audio data output from the audio processing unit as an audible sound;
A sound pressure detector for periodically detecting a sound pressure of the audible sound output from the audio output unit;
A memory for storing a cumulative sound pressure accumulation time period and a cumulative start time under predetermined control;
A display unit for displaying daily usage remaining time and hearing guidance messages that fluctuate according to accumulation of harmful sound pressure;
If the sound pressure detected by the sound pressure detector exceeds a preset harmful sound pressure threshold value, the harmful sound pressure is accumulated for a longer time, and the cumulative sound pressure average value and cumulative exposure time from the preset cumulative start time are calculated and the user is currently listening. Calculate and display medically acceptable daily use remaining time in continuous exposure to sound level similar to current sound pressure corresponding to volume, but display the daily use remaining time variable according to user's volume control If the accumulated cumulative time interval is less than the allowable daily exposure time, it is initialized. If the accumulated harmful sound pressure exceeds the medical daily exposure allowance time, the sound source playback of the terminal is forcibly stopped for the time required to restore the function of the hair cells of the ear. It is composed of a control unit that performs a forced stop that is not responding to a button. A portable acoustic device has a hearing loss prevention function of the.
The portable audio terminal of claim 1, wherein the display unit displays a sound pressure level information indicating a current sound pressure in the vicinity of the volume control and displays a volume controller in the overlapped LCD display unit.
The portable audio terminal according to claim 1 or 2, wherein the display unit forms a use remaining time bar bar that schematically displays the daily use remaining time of the sound terminal during sound source reproduction.
In the control method for preventing hearing damage in a portable acoustic terminal having a hearing damage prevention function,
A first step of periodically checking the current sound pressure of the audible sound output from the audio output unit of the portable sound terminal being reproduced through the sound pressure detector;
A second process of determining, by the controller, whether the checked current sound pressure exceeds a preset harmful sound pressure threshold;
As the checked current sound pressure exceeds the threshold of the harmful sound pressure, the control unit accumulates the harmful sound pressure for the time exceeding the threshold, and accumulates the daily harmful sound pressure cumulative amount by using the mean sound pressure average value and the cumulative exposure time from a preset cumulative start time. A third step of calculating the daily remaining time according to the user's current volume status based on the cumulative sound pressure;
The control unit periodically displays the daily usage remaining time, which can be changed at any time according to the current volume of the user, on the display unit, and provides a warning message at least one of visible and audible through a user interface at the time of warning;
Hearing damage prevention function, characterized in that the control is made of a fifth process for initializing all of the remaining daily use time, cumulative sound pressure accumulation amount, cumulative exposure time when a predetermined cumulative time interval has elapsed while the medical daily exposure exposure time is less than Control method of a portable acoustic terminal having a.
The method of claim 4, further comprising: forcibly stopping the regeneration of the sound source of the terminal for 12 hours to one day corresponding to the time required to restore the function of the hair cells of the ear as the daily harmful sound pressure accumulation amount exceeds the medical daily exposure allowable time. A control method of a portable acoustic terminal having a hearing damage prevention function characterized in that.
The control method according to claim 5, wherein the noisy sound pressure threshold is 80 dB and the cumulative time interval is 24 hours.
The method of claim 4, wherein
Judging whether the check sound pressure exceeds the pre-determined noisy sound pressure discrimination threshold, which can cause an immediate abnormality in hearing if the check sound pressure exceeds a preset harmful sound pressure threshold in the second step;
The control method of the portable acoustic terminal having a hearing damage prevention function, characterized in that it further has a process of stopping the playback of the sound source of the terminal and providing a playback stop guide message when the sound pressure determination threshold is exceeded.
The method of claim 4, wherein
Storing the last selected cumulative start time in a memory through a user interface according to a change request in the harmful sound pressure cumulative start time in a function setting mode using an input unit of a portable acoustic terminal;
After storing the changed cumulative start time and requesting to change the cumulative sound pressure start time through the input unit, the process of selectively storing the cumulative start time change based on the regeneration of the sound source is accumulated in the memory. A control method of a portable acoustic terminal having a hearing damage prevention function characterized in that.

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