Hearing protection methods that can block external high sound pressure level energy

Abstract

To provide a hearing protection method that can block external high sound pressure level energy.SOLUTION: A hearing protection method compares an external sound energy value to a sound pressure energy threshold 1 and a sound pressure energy threshold 2, and if the external sound energy value is greater than the sound pressure energy threshold 1 and less than the sound pressure energy threshold 2, a pre-defined active noise reduction function is activated to reduce the high sound pressure level energy. If the external sound energy value is greater than the sound pressure energy threshold 2, the pre-defined active noise reduction function is turned off and the passive noise reduction method is used to intercept the high sound pressure level energy.EFFECT: External high sound pressure level energy can be intercepted and can effectively fulfill the function of hearing protection when high sound pressure level energy is suddenly generated in an external environment.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for noise reduction treatment of an audio device, and more particularly to a hearing protection method that can block external high sound pressure level energy. [Background technology]

[0002] Hearing protection is a very important thing in daily life. In many cases, when people realize they need to protect their hearing, their hearing has already become a problem. However, hearing damage is basically irreversible. For young people, the most serious factor in hearing loss is noise, and earphones also have a significant impact on our hearing.

[0003] As shown in Figure 1, existing data shows that the louder the sound, the greater the damage to the human ear. The following table shows the human ear's tolerance for noise. [Table 1]

[0004] In the prior art, it is common to use ANC noise reduction to reduce environmental noise, allowing users to protect their hearing by listening to music at lower volume levels. The following are exceptions:

[0005] First, when ANC is turned on and there is a high sound pressure level, the ANC microphone is already saturated, and distorted signals are superimposed on the ear. This not only fails to achieve noise reduction, but also generates more energy that can damage hearing. And when ANC is turned off, only passive noise reduction can block some of the high sound pressure level energy from the outside world, and the ANC noise reduction function cannot be effectively utilized. Furthermore, when ANC is in pass-through mode, the system amplifies high sound pressure level energy, making the sound energy in your ears louder and more damaging. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a hearing protection method that can protect hearing when high sound pressure level energy is suddenly generated in the outside world and can also block the external high sound pressure level energy. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0008] A hearing protection method capable of blocking external high sound pressure level energy includes step S1 of presetting a sound pressure energy threshold 1 and a sound pressure energy threshold 2 that is greater than the sound pressure energy threshold 1; step S2 of acquiring an external sound energy value; step S3 of comparing the external sound energy value with the sound pressure energy threshold 1 and the sound pressure energy threshold 2, and executing step S4 if the external sound energy value is greater than the sound pressure energy threshold 1 and less than the sound pressure energy threshold 2, and executing step S5 if the external sound energy value is greater than the sound pressure energy threshold 2; step S4 of activating a preset active noise reduction function to reduce the high sound pressure level energy; and step S5 of turning off the preset active noise reduction function and blocking the high sound pressure level energy using a passive noise reduction method.

[0009] Preferably, in step S1, the sound pressure energy threshold 1 is set to a sound pressure energy level of the feedforward microphone FF MIC equivalent to 80 dBA SPL at the eardrum of the user.

[0010] Preferably, in step S1, the sound pressure energy threshold 2 is set to a high sound pressure energy level at which a FF MIC tested in a laboratory tends to saturate.

[0011] Preferably, in step S2, the external acoustic energy value is obtained by FF MIC or Talk MIC.

[0012] Preferably, in step S2, the process of obtaining the external acoustic energy value includes converting the change in the external sound signal collected in real time by the FF MIC or the Talk MIC into an audio data stream, and calculating the audio data stream using an A-weighted digital system to obtain the current external acoustic energy value.

[0013] Preferably, a bilinear transformation method is used to transform the transfer function of the A-weighted digital system into a digital filter.

[0014] Preferably, a virtual switch is set corresponding to the hearing protection method, and the virtual switch is set to a pre-set app, and when the virtual switch is activated, steps S1 to S5 are executed, and when the virtual switch is turned off, steps S1 to S5 are not executed. [Effects of the Invention]

[0015] The hearing protection method disclosed in the present invention for blocking external high sound pressure level energy achieves the hearing protection function by monitoring external high sound pressure level energy in real time and taking intervention measures. In particular, the external high sound pressure level energy is monitored in real time and compared with a preset sound pressure energy threshold 1 and a sound pressure energy threshold 2. If the high sound pressure level energy exceeds the preset sound pressure energy threshold 1, the system turns on the ANC function to protect hearing, and if the high sound pressure level energy exceeds the preset sound pressure energy threshold 2, the system turns off the ANC function to protect hearing. Compared with the prior art, the present invention can block external high sound pressure level energy and effectively protect hearing when high sound pressure level energy suddenly occurs in the outside world, thereby better meeting application needs. [Brief explanation of the drawings]

[0016] [Figure 1] This is a schematic diagram of the environment corresponding to the audio decibel levels in existing materials. [Figure 2] 1 is a flow chart of the hearing protection method of the present invention. [Figure 3] 1 is a schematic diagram of the curves of an A-weight network. [Figure 4] FIG. 1 is a schematic diagram of the architecture of an A-weight digital system. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will now be described in detail in conjunction with the accompanying drawings and embodiments.

[0018] The present invention discloses a hearing protection method that can block external high sound pressure level energy, and referring to FIG. Step S1 of presetting a sound pressure energy threshold 1 and a sound pressure energy threshold 2 that is greater than the sound pressure energy threshold 1; Step S2 of obtaining an external acoustic energy value; Step S3: comparing the external acoustic energy value with the sound pressure energy threshold 1 and the sound pressure energy threshold 2; if the external acoustic energy value is greater than the sound pressure energy threshold 1 and less than the sound pressure energy threshold 2, executing step S4; if the external acoustic energy value is greater than the sound pressure energy threshold 2, executing step S5; Step S4 of activating a preset active noise reduction function to reduce high sound pressure level energy; and step S5 of turning off the preset active noise reduction function and blocking the high sound pressure level energy using a passive noise reduction method.

[0019] In the above method, the present invention achieves hearing protection by monitoring external high sound pressure level energy in real time and taking intervention measures. In particular, the external high sound pressure level energy is monitored in real time and compared with preset sound pressure energy threshold 1 and sound pressure energy threshold 2. If the high sound pressure level energy exceeds preset sound pressure energy threshold 1, the system turns on the ANC function to protect hearing, and if the high sound pressure level energy exceeds preset sound pressure energy threshold 2, the system turns off the ANC function to protect hearing. Compared with the prior art, the present invention can block external high sound pressure level energy and effectively fulfill the role of hearing protection when high sound pressure level energy suddenly occurs in the outside world, thereby better meeting application needs.

[0020] In one preferred embodiment, in step S1, a sound pressure energy level of the feedforward microphone FF MIC equivalent to 80 dBA SPL at the user's eardrum is set as the sound pressure energy threshold 1. In step S1, a high sound pressure energy level at which the FF MIC tends to saturate as tested in a laboratory is set as the sound pressure energy threshold 2.

[0021] In this embodiment, step S2 acquires an external acoustic energy value through the FF MIC or the talk MIC. Specifically, the process of acquiring the external acoustic energy value in step S2 includes converting the change in the external sound signal collected in real time by the FF MIC or the talk MIC into an audio data stream, and calculating the audio data stream using an A-weighted digital system to obtain the current external acoustic energy value.

[0022] Below, one specific example is provided as a further illustrative example.

[0023] Example 1 In this embodiment, the audio device is an insert-type noise reduction earphone as an example, and the device has three MICs: FF, FB, and Talk MIC, of ​​which the FF MIC is located outside the ear canal, and the data acquired by the FF MIC is data of external high sound pressure level energy. Similarly, external high sound pressure level energy data can also be acquired by the Talk MIC.

[0024] In this example, preset threshold 1 represents the minimum energy that the system can cancel by turning on ANC. Generally, it is believed that failure to take protective measures within a reasonable time will damage the user's hearing. In this example, a sound pressure energy level of the FF MIC equivalent to 80 dBA SPL at the user's eardrum is considered to belong to appropriate threshold 1. Preset threshold 2 represents the maximum energy that the system can cancel by turning on ANC. Laboratory tests have shown that the high sound pressure level energy that causes the FF MIC to saturate is preset threshold 2. If high sound pressure level energy exceeds threshold 2, the ANC microphone will saturate, causing the ANC to fail. The speaker may output a noise signal, further increasing the sound energy in the ear. In this case, the optimal protective measure is to turn off ANC and block high sound pressure level energy using only the system's passive noise reduction.

[0025] Regarding specific protective measures, in this embodiment, the system compares the energy measured by the external microphone with threshold 1 and threshold 2 in real time, and takes corresponding measures according to the result: if the microphone energy is greater than threshold 1 and less than threshold 2, the system turns on the ANC to avoid high sound pressure levels; if the microphone energy is greater than threshold 2, the system turns off the ANC to avoid failure of the noise reduction cut-off due to microphone saturation.

[0026] Based on the above-described first embodiment, the audio device of the present invention can measure high external sound pressure levels by using an external microphone to collect changes in external audio signals in real time and convert the changes in the audio signal into an audio data stream. The A-weighted mode is adopted to calculate the audio stream and obtain the current audio energy. A-weighted is a standard weighting curve for audio measurement, used to reflect the response characteristics of the human ear. The sound pressure level is derived from the A-weighted curve and expressed in dBA. A-weighted is widely used in measuring noise and stable audio signals. Its frequency domain curve is shown in FIG. 3. As can be seen from FIG. 3, when using A-weighted audio measurement, the weighting for low frequencies is lower than that for mid- and high frequencies. A-weighted is the most widely used because it is the most meaningful for describing the frequency response of the human ear in real acoustics.

[0027] Specifically, the transfer function of an A-weighted digital system is

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[0028] In practical applications, the hearing protection method of the present invention can be controlled by setting a virtual switch. For example, a virtual switch is set corresponding to the hearing protection method, and the virtual switch is set to a pre-set app. When the virtual switch is activated, steps S1 to S5 are executed, and when the virtual switch is turned off, steps S1 to S5 are not executed.

[0029] Compared with the prior art, the beneficial effects of the hearing protection method disclosed in the present invention are as follows: The present invention can block external high sound pressure level energy, and can effectively perform the role of hearing protection when high sound pressure level energy suddenly occurs in the outside world, so as to better meet the application needs.

[0030] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

[0031] (Addendum) (Appendix 1) A hearing protection method capable of blocking external high sound pressure level energy, comprising: Step S1 of presetting a sound pressure energy threshold 1 and a sound pressure energy threshold 2 that is greater than the sound pressure energy threshold 1; Step S2 of obtaining an external acoustic energy value; Step S3: comparing the external acoustic energy value with the sound pressure energy threshold 1 and the sound pressure energy threshold 2; if the external acoustic energy value is greater than the sound pressure energy threshold 1 and less than the sound pressure energy threshold 2, executing step S4; if the external acoustic energy value is greater than the sound pressure energy threshold 2, executing step S5; Step S4 of activating a preset active noise reduction function to reduce high sound pressure level energy; and step S5 of turning off a preset active noise reduction function and blocking high sound pressure level energy using a passive noise reduction method. A hearing protection method that can block external high sound pressure level energy.

[0032] (Appendix 2) The hearing protection method capable of blocking external high sound pressure level energy described in Appendix 1, characterized in that in step S1, the sound pressure energy level of the feedforward microphone FF MIC equivalent to 80 dBA SPL at the user's eardrum is set as the sound pressure energy threshold 1.

[0033] (Appendix 3) The hearing protection method for blocking external high sound pressure level energy described in Appendix 1, characterized in that in step S1, the high sound pressure energy level at which an FF MIC is about to saturate in a laboratory test is set as the sound pressure energy threshold 2.

[0034] (Appendix 4) The hearing protection method for blocking external high sound pressure level energy described in Appendix 1, characterized in that in step S2, the external sound energy value is obtained using an FF MIC or a Talk MIC.

[0035] (Appendix 5) In step S2, the process of obtaining the external sound energy value includes converting the change amount of the external sound signal collected in real time by the FF MIC or the Talk MIC into an audio data stream, and calculating the audio data stream using an A-weighted digital system to obtain the current external sound energy value; The transfer function of an A-weighted digital system is

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[0036] (Appendix 6) 6. The hearing protection method for blocking external high sound pressure level energy described in Appendix 5, characterized in that the transfer function of the A-weighted digital system is converted into a digital filter using a bilinear transformation method.

[0037] (Appendix 7) A hearing protection method capable of blocking external high sound pressure level energy as described in Appendix 1, characterized in that a virtual switch is set corresponding to the hearing protection method, the virtual switch is set to a pre-set app, and when the virtual switch is activated, steps S1 to S5 are executed, and when the virtual switch is turned off, steps S1 to S5 are not executed.

Claims

1. A hearing protection method capable of blocking external high sound pressure level energy, comprising: Step S1 of presetting a sound pressure energy threshold 1 and a sound pressure energy threshold 2 that is greater than the sound pressure energy threshold 1; Step S2 of obtaining an external acoustic energy value; Step S3: comparing the external acoustic energy value with the sound pressure energy threshold 1 and the sound pressure energy threshold 2; if the external acoustic energy value is greater than the sound pressure energy threshold 1 and less than the sound pressure energy threshold 2, executing step S4; if the external acoustic energy value is greater than the sound pressure energy threshold 2, executing step S5; Step S4: activating a preset active noise reduction function to reduce high sound pressure level energy; and step S5 of turning off a preset active noise reduction function and blocking high sound pressure level energy using a passive noise reduction method; In step S2, an external acoustic energy value is acquired by FF MIC or Talk MIC; In step S2, the process of obtaining the external sound energy value includes converting the change amount of the external sound signal collected in real time by the FF MIC or Talk MIC into an audio data stream, and calculating the audio data stream using an A-weighted digital system to obtain the current external sound energy value; Using MATLAB® software, convert the transfer function of the A-weighted digital system into a digital filter, and obtain the filter coefficient h(n); Set the input audio data stream as x(n), and after processing it with an A-weighted digital system, the output is y(n), and perform sound pressure level calculation on the y(n) data to obtain the dBA value of the current audio. characterized in that A hearing protection method that can block external high sound pressure level energy.

2. 2. The hearing protection method for blocking external high sound pressure level energy according to claim 1, wherein in step S1, the sound pressure energy level of the feedforward microphone FF MIC equivalent to 80 dBA SPL at the user's eardrum is set as the sound pressure energy threshold 1.

3. 2. The hearing protection method of claim 1, wherein in step S1, the high sound pressure energy level at which the FF MIC is about to saturate as tested in a laboratory is set as the sound pressure energy threshold 2.

4. The transfer function of the A-weighted digital system is [Equation 1] where: [Equation 2] in, [Equation 3] and The formula for calculating sound pressure level is: [Equation 4] where: [Equation 5] 2. The hearing protection method for blocking external high sound pressure level energy according to claim 1, wherein:

5. 2. The hearing protection method for blocking high external sound pressure level energy as claimed in claim 1, wherein the transfer function of the A-weighted digital system is converted into a digital filter using a bilinear transformation method.

6. 2. The hearing protection method for blocking external high sound pressure level energy according to claim 1, wherein a virtual switch is set corresponding to the hearing protection method, the virtual switch is set to a preset App, and when the virtual switch is activated, steps S1 to S5 are executed, and when the virtual switch is turned off, steps S1 to S5 are not executed.

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