TW201322253A - Audio adjustment apparatus and its adjustment method - Google Patents

Abstract

An audio adjustment apparatus and its adjustment method include a storage device and a processor. The storage device is used for storing a pre-inputted audio sample, the processor is connected to the said storage device for receiving an currently inputted audio sample, and further receiving an surrounding audio sample related to the environment voices. In addition, according to the pre-inputted audio sample stored in the storage device and the said surrounding audio sample, an audio distortion sample is obtained, therefore, according to the audio distortion sample and currently inputted audio sample, a processed audio sample is obtained.

Description

Audio adjustment device and adjustment method thereof

The invention relates to an audio adjusting device and an adjusting method thereof, in particular to an audio adjusting device capable of automatically reducing relative noise and an adjusting method thereof.

At present, the size of the audio output by the general TV, audio and other devices must be adjusted by the user, and can not be automatically adjusted according to the background noise of the environment to the optimal volume that can be clearly heard by the human ear; in addition, these devices lack recognition. The function of a specific event in the surrounding environment is likely to cause the user to ignore the important events that occur in the surrounding environment due to listening to music or watching TV too much.

Accordingly, it is an object of the present invention to provide an audio adjustment device that automatically reduces noise relatively.

Thus, the audio adjustment device of the present invention comprises a memory and a processor. The memory is used to store a previously input audio sample. The processor is electrically connected to the memory for receiving a current input audio sample and receiving an environmental audio sample related to the ambient sound, and based on the previously input audio sample and the environmental audio sample stored by the memory, An audio distortion sample is obtained, and a processed audio sample is obtained according to the audio distortion sample and the current input audio sample.

Yet another object of the present invention is to provide an audio adjustment method that automatically reduces noise relatively.

Thus, the audio adjustment method of the present invention is applied to an audio adjustment system including a memory, an audio capture device, a processor, an output stage, and a speaker. The memory stores a previously input audio sample, the audio capture device captures an ambient sound to obtain an environmental audio sample, and the output stage obtains an output audio sample according to a processed audio sample, and the speaker plays the output audio sample . The audio adjustment method is performed by the processor and includes the following steps:

(A) receiving a current input audio sample; (B) receiving the environmental audio sample;

(C) obtaining an audio distortion sample based on the previously input audio sample and the ambient audio sample stored in the memory;

(D) obtaining the processed audio sample based on the audio distortion sample and the current input audio sample.

The effect of the present invention is that by obtaining the audio distortion samples related to the ambient sound and processing according to the audio distortion samples, the noise can be automatically reduced relatively.

The foregoing and other technical aspects, features and advantages of the present invention will be apparent from the Detailed Description of the <RTIgt;

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1, a first preferred embodiment of the audio adjusting device 1 of the present invention is adapted to be electrically connected to an audio capture device 2 and a speaker 3 to form an audio adjustment system. The audio adjustment device 1 includes a memory 11, a processor 12 electrically connected to the memory 11 and the audio capture device 2, and an output stage 13 electrically connected to the processor 12 and the speaker 3. The audio capture device 2 (for example, a microphone) is used to capture ambient sounds to obtain an environmental audio sample. The storage unit 11 has a first storage space 111 and a second storage space 112. The first storage space 111 is configured to store at least one input audio sample, and the second storage space 112 is configured to store at least one audio distortion. sample. The output stage 13 is configured to receive a digital processed audio sample and perform digital to analog conversion on the processed audio sample to obtain an analog output audio sample. The speaker 3 is used to play the output audio sample.

Referring to Figures 1 and 2, the processor 12 is configured to perform an audio adjustment method. The audio adjustment method includes the following steps 21~24.

Step 21: The processor 12 receives a current input audio sample A(t) and stores the current input audio sample A(t) in the first storage space 111 of the storage 11. It should be noted that, before the step 21, the first storage space 111 of the current input audio sample A(t) has the previous input audio sample A(t-Δt), which is hereinafter referred to as the previous Input the audio sample A(t-Δt).

Step 22: The processor 12 receives the ambient audio sample B (t-Δt) from the audio extractor 2.

Step 23: The processor 12 obtains an audio distortion sample f according to the previously input audio sample A(t-Δt) stored in the memory 11 and the ambient audio sample B(t-Δt) obtained in step 22. (t-Δt), and the audio distortion sample f(t-Δt) is stored in the second storage space 112 of the storage 11.

In this embodiment, the processor 12 subtracts the previous input audio sample A(t-Δt) stored in the memory 11 from the ambient audio sample B(t-Δt) to obtain the audio distortion sample f. (t-Δt), that is, f(t-Δt)=B(t-Δt)-A(t-Δt).

Step 24: The processor 12 adjusts and updates the size of the current input audio sample A(t) stored in the memory 11 according to the size of the audio distortion sample f(t-Δt) stored in the memory 11. The processed audio sample A'(t) is obtained according to the adjusted current input audio sample A(t) stored in the memory 11. Then skip to step 21.

In this embodiment, the processor 12 treats the adjusted current input audio sample A(t) stored in the memory 11 as the processed audio sample A'(t), that is, A'( t)=A(t). In addition, the processor 12 adjusts the size of the current input audio sample A(t) stored in the memory 11 when the size of the audio distortion sample f(t-Δt) is too large, and the audio is increased. When the size of the distortion sample f(t-Δt) is small, the size of the current input audio sample A(t) stored in the memory 11 is reduced to maintain a fixed signal-to-noise ratio (SNR). Therefore, the more noisy the environment, the larger the size of the audio distortion sample f(t-Δt), the higher the volume played by the speaker 3, and the quieter the environment makes the audio distortion sample f ( The smaller the size of t-Δt), the lower the volume played by the speaker 3, thus eliminating the need for the user to adjust the volume by himself. Furthermore, the processor 12 can limit the size of the adjusted current input audio sample A(t) stored in the memory 11 to a preset upper limit value, for example, 85 dB, thereby limiting the speaker 3 to play. The volume will not exceed 85dB to avoid the user's hearing loss or the audio adjustment device is damaged due to excessive output power.

Referring to FIG. 1 and FIG. 3, the second preferred embodiment of the audio adjusting device 1 of the present invention is similar to the first preferred embodiment, except that the audio adjusting method performed by the processor 12 includes the following steps 31~ 43.

Step 31: The processor 12 receives the current input audio sample A(t), and stores the current input audio sample A(t) in the first storage space 111 of the storage 11. It is to be noted that, before the step 31, the first storage space 111 of the current input audio sample A(t) of the memory 11 has the previous input audio sample A(t-Δt), which is hereinafter referred to as the previous Input the audio sample A(t-Δt).

Step 32: The processor 12 receives the ambient audio sample B (t-Δt) from the audio extractor 2.

Step 33: The processor 12 obtains the audio distortion sample f according to the previously input audio sample A (t-Δt) stored in the memory 11 and the ambient audio sample B (t-Δt) obtained in step 32. (t-Δt), for example f(t-Δt)=B(t-Δt)-A(t-Δt), and storing the audio distortion sample f(t-Δt) in the second of the reservoir 11 In the storage space 112.

Step 34: The processor 12 adjusts and updates the size of the current input audio sample A(t) stored in the memory 11 according to the size of the audio distortion sample f(t-Δt) stored in the storage 11, for example When the size of the audio distortion sample f(t-Δt) is too large, the size of the current input audio sample A(t) stored in the memory 11 is increased, and the audio distortion sample f(t-Δt) is adjusted. When the size is small, the size of the current input audio sample A(t) stored in the memory 11 is reduced to maintain a fixed signal-to-noise ratio, and the adjusted storage stored in the memory 11 is limited. At present, the size of the input audio sample A(t) does not exceed the preset upper limit value.

Step 35: The processor 12 is configured to determine whether a specific event needs to be recognized according to an identification indication (for example, a baby crying, a patient crying, a telephone ringing or a doorbell ringing, etc.), if yes, skip to step 36, if no Then skip to step 41. The identification indication is set by the user.

Step 36: assembling at least one audio distortion sample f(tn×Δt), n=1, . . . , N, N in the preset period of time stored by the processor 12 according to the storage unit 11. 1. Identify whether the specific event has occurred. If yes, skip to step 37. If no, skip to step 40. It is worth noting that if the number of audio distortion samples is sufficient, the accuracy of the specific event judgment is relatively high.

Step 37: The processor 12 sets an event continuation indication and an event occurrence indication. The event continuation indication can be set to "Yes" (indicating that the specific event continues to occur) or "No" (indicating that the specific event does not continue to occur), and its initial value is "No". The event occurrence indication can be set to "Yes" (indicating that the specific event occurs) or "No" (indicating that the specific event has not occurred), and its initial value is "No". In step 37, the processor 12 first sets the event continuation indication to be the same as the event occurrence indication, and then sets the event occurrence indication to "Yes".

Step 38: The processor 12 determines whether one of the first condition and the second condition is established according to the event continuation indication, the event occurrence indication, and an alert indication. If yes, skip to step 39, and if not, Then skip to step 41. The alert indication can be set to be alert or no alert, and the initial value is no need to be alerted. The first condition is that the event continuation indication is set to "No". The second condition is that the event continuation indication is set to "Yes" and the alert indication is set to be alerted.

Step 39: The processor 12 sets the warning indication as an alert, and reduces and updates the size of the adjusted current input audio sample A(t) stored in the storage 11 and stores according to the storage 11. The reduced input current audio sample A(t) obtains the processed audio sample A'(t), for example A'(t)=A(t), to reduce the volume played by the speaker 3, or even mute Therefore, the user can more easily perceive the occurrence of the specific event. Then skip to step 42.

Step 40: The processor 12 sets the event continuation indication, the event occurrence indication, the warning indication, and an alert shutdown indication. The warning off indication can be set to "Yes" by the user (indicating that the warning needs to be stopped) or set to "No" by the processor 12 (indicating that the warning is not required to be stopped), and the initial value is "No". In step 40, the processor 12 sets the event continuation indication, the event occurrence indication, and the warning off indication to "No", and sets the warning indication to no need to be alerted.

Step 41: The processor 12 obtains the processed audio sample A'(t) according to the adjusted current input audio sample A(t) stored in the storage 11, for example, A'(t)=A(t) So that the volume played by the speaker 3 is not affected by whether a specific event occurs.

Step 42: The processor 12 determines whether to stop the warning according to the warning off indication, and if yes, skips to step 43, if not, then skips to step 31.

Step 43: The processor 12 sets the alert indication to be no need to be alerted. Then skip to step 31.

In this embodiment, by step 38, it can be avoided that when the specific event continues to occur and the user chooses to stop the warning, the alarm is re-issued when steps 41-43 are executed again.

Referring to FIG. 1 and FIG. 4, a third preferred embodiment of the audio adjusting device 1 of the present invention is similar to the second preferred embodiment, except that the processor 12 performs the step 34' of the audio adjusting method and Step 41'.

Step 34 ′: The processor 12 adjusts and updates the size of the current input audio sample A(t) stored in the memory 11 according to a gain, wherein the gain may be a set value set by a user, or A preset value is set in the audio adjusting device 1.

Step 41 ′: The processor 12 obtains the processed audio sample A′(t) according to the adjusted current input audio sample A(t) stored in the memory 11 and the audio distortion sample f(t−Δt). .

In this embodiment, the adjusted current input audio sample A(t) stored in the memory 11 is subtracted from the audio distortion sample f(t-Δt) to obtain the processed audio sample A' ( t), that is to say A'(t)=A(t)-f(t-Δt).

It should be noted that, in the first and second preferred embodiments, the processor 12 stores the memory 11 when the environment is noisy such that the size of the audio distortion sample f(t-Δt) is too large. The current input audio sample A(t) is adjusted to obtain the processed audio sample A'(t), so that the volume played by the speaker 3 is also increased, so the noise is relatively reduced, and in the third preferred In an embodiment, the processor 12 subtracts the audio distortion sample f(t-Δt) from the adjusted current input audio sample A(t) stored in the memory 11 to obtain the processed audio sample A' ( t), so that the sound played by the speaker 3 can cancel the noise, so the noise is relatively reduced.

Referring to FIG. 5 and FIG. 6, the fourth preferred embodiment of the audio adjusting device 1' of the present invention is similar to the first preferred embodiment, except that: (1) the audio adjusting device 1' further includes an electrical connection. In the alerter 14 of the processor 12, the alerter 14 (such as a screen, a light or a vibrator, etc.) is configured to receive an alert indication and issue an alert when the alert indication is set to require an alert (eg, a screen display message, The light is flashing or vibrator vibrating, etc., and the warning is stopped when the warning indication is set to no warning, the initial value of the warning indication is not required to be alerted; and (2) the audio adjustment performed by the processor 12 The method includes the following steps 61-73.

Step 61: The processor 12 receives the current input audio sample A(t), and stores the current input audio sample A(t) in the first storage space 111 of the storage 11. It should be noted that, before the step 61, the first storage space 111 of the current input audio sample A(t) of the memory 11 has the previous input audio sample A(t-Δt), which is hereinafter referred to as the previous Input the audio sample A(t-Δt).

Step 62: The processor 12 receives the ambient audio sample B(t-[Delta]t) from the audio capture device 2.

Step 63: The processor 12 obtains the audio distortion sample f according to the previously input audio sample A(t-Δt) stored in the memory 11 and the ambient audio sample B(t-Δt) obtained in step 62. (t-Δt), for example f(t-Δt)=B(t-Δt)-A(t-Δt), and storing the audio distortion sample f(t-Δt) in the second of the reservoir 11 In the storage space 112.

Step 64: The processor 12 adjusts and updates the size of the current input audio sample A(t) stored in the memory 11 according to the size of the audio distortion sample f(t-Δt) stored in the storage 11, for example When the size of the audio distortion sample f(t-Δt) is too large, the size of the current input audio sample A(t) stored in the memory 11 is increased, and the audio distortion sample f(t-Δt) is adjusted. When the size is small, the size of the current input audio sample A(t) stored in the memory 11 is reduced to maintain the fixed signal-to-noise ratio, and the adjusted storage stored in the memory 11 is limited. At present, the size of the input audio sample A(t) does not exceed the preset upper limit value.

Step 65: The processor 12 determines, according to an identification indication, whether a specific event needs to be recognized (for example, a baby crying, a patient crying, a telephone ringing or a doorbell ringing, etc.), if yes, skip to step 66, and if not, Then skip to step 71. The identification indication is set by the user.

Step 66: The processor 12 calculates at least one audio distortion sample f(tn×Δt), n=1, . . . , N, N according to a preset period of time stored by the storage 11. 1. Identify whether the specific event has occurred. If yes, skip to step 67. If no, skip to step 70. It is worth noting that if the number of audio distortion samples is sufficient, the accuracy of the specific event judgment is relatively high.

Step 67: The processor 12 sets an event continuation indication and an event occurrence indication. The event continuation indication can be set to "Yes" (indicating that the specific event continues to occur) or "No" (indicating that the specific event does not continue to occur), and its initial value is "No". The event occurrence indication can be set to "Yes" (indicating that the specific event occurs) or "No" (indicating that the specific event has not occurred), and its initial value is "No". In step 67, the processor 12 first sets the event continuation indication to be the same as the event occurrence indication, and then sets the event occurrence indication to "Yes".

Step 68: The processor 12 determines whether one of the first condition and the second condition is established according to the event continuation indication, the event occurrence indication, and the warning indication, and if yes, skip to step 69, and if not, Then skip to step 71. The first condition is that the event continuation indication is set to "No". The second condition is that the event continuation indication is set to "Yes" and the alert indication is set to be alerted.

Step 69: The processor 12 sets the alert indication to be an alert, so that the alerter 14 issues an alert to notify the user of the occurrence of the specific event. Then skip to step 71.

Step 70: The processor 12 sets the event continuation indication, the event occurrence indication, the warning indication, and an alert shutdown indication. The warning off indication can be set to "Yes" by the user (indicating that the warning needs to be stopped) or set to "No" by the processor 12 (indicating that the warning is not required to be stopped), and the initial value is "No". In step 70, the processor 12 sets the event continuation indication, the event occurrence indication, and the warning off indication to "No", and sets the warning indication to be no need to be alerted.

Step 71: The processor 12 obtains the processed audio sample A'(t) according to the adjusted current input audio sample A(t) stored in the memory 11, for example, A'(t)=A(t ).

Step 72: The processor 12 determines whether to stop the warning according to the warning off indication, and if yes, skips to step 70, and if not, skips to step 61.

Step 73: The processor 12 sets the alert indication to no need to be alerted, so that the alerter 14 stops issuing the alert. Then skip to step 61.

Referring to FIG. 5 and FIG. 7, a fifth preferred embodiment of the audio adjusting device 1' of the present invention is similar to the fourth preferred embodiment, except that the processor 12 performs the step 64' of the audio adjusting method. And step 71'.

Step 64 ′: The processor 12 adjusts and updates the size of the current input audio sample A(t) stored in the memory 11 according to a gain, wherein the gain may be a set value set by a user, or A preset value is set in the audio adjusting device 1.

Step 71 ′: The processor 12 obtains the processed audio sample A′(t) according to the adjusted current input audio sample A(t) stored in the memory 11 and the audio distortion sample f(t−Δt). For example, A'(t)=A(t)-f(t-Δt).

In summary, in the first, second and fourth preferred embodiments, the processor 12 stores the memory 11 when the environment is noisy such that the size of the audio distortion sample f(t-Δt) is too large. The stored current input audio sample A(t) is adjusted to obtain the processed audio sample A'(t), so that the volume played by the speaker 3 is also increased, so the noise is relatively reduced, and in the first In the third and fifth preferred embodiments, the processor 12 subtracts the adjusted current input audio sample A(t) stored in the memory 11 from the audio distortion sample f(t-Δt) to obtain the The audio sample A'(t) is processed so that the sound played by the speaker 3 can cancel the noise, so the noise is relatively reduced.

In addition, in the second to fifth preferred embodiments, the audio adjusting device 1, 1' further has a function of recognizing a specific event, and in the second and third preferred embodiments, the method is to reduce the volume. The user is more likely to perceive the occurrence of the specific event, and in the fourth and fifth preferred embodiments, the user is notified of the occurrence of the specific event in a reminder manner.

It should be noted that, in the first to fifth preferred embodiments, the audio capture device 2 is externally connected to the audio adjustment device 1, 1 ′, and communicates with the processor 12 in a wired manner, but In another embodiment, the audio capture device 2 can communicate with the processor 12 in a wireless manner. In still another embodiment, the audio capture device 2 can be built in the audio adjustment device 1. 1'. In addition, in the first to fifth preferred embodiments, the audio adjusting device 1, 1' is applied to a mono audio adjusting system, that is, there is only one speaker, but those skilled in the art have the above description. It can be inferred how the audio adjustment device 1, 1' is modified when applied to a multi-channel audio adjustment system, and therefore will not be described.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1, 1’. . . Audio adjustment device

11. . . Storage

111. . . First storage space

112. . . Second storage space

12. . . processor

13. . . Output stage

14. . . Warning device

2. . . Audio capture

3. . . speaker

21~24. . . step

31~43. . . step

34’. . . step

41’. . . step

61~73. . . step

64’. . . step

71’. . . step

1 is a block diagram showing first to third preferred embodiments of the audio adjusting device of the present invention;

2 is a flow chart illustrating an audio adjustment method performed by the first preferred embodiment;

3 is a flow chart illustrating an audio adjustment method performed by the second preferred embodiment;

4 is a flow chart illustrating an audio adjustment method performed by the third preferred embodiment;

Figure 5 is a block diagram showing the fourth and fifth preferred embodiments of the audio adjusting device of the present invention;

FIG. 6 is a flowchart illustrating an audio adjustment method performed by the fourth preferred embodiment; and

Figure 7 is a flow chart showing an audio adjustment method performed by the fifth preferred embodiment.

1'. . . Audio adjustment device

11. . . Storage

111. . . First storage space

112. . . Second storage space

12. . . processor

13. . . Output stage

14. . . Warning device

2. . . Audio capture

3. . . speaker

Claims (13)

An audio adjustment device includes: a memory for storing a previously input audio sample; a processor electrically coupled to the memory for receiving a current input audio sample and receiving an ambient audio related to the ambient sound And obtaining an audio distortion sample according to the previously input audio sample and the environmental audio sample stored in the memory, and obtaining a processed audio sample according to the audio distortion sample and the current input audio sample. The audio adjustment device according to claim 1, wherein the processor further determines whether a specific event needs to be recognized according to an identification indication, and when determining that the identification indication is set to identify the specific event, according to At least one audio distortion sample within the preset time period identifies whether the particular event occurs. The audio adjustment device of claim 2, wherein the processor further sets an event continuation indication and an event occurrence indication when the specific event occurs, and continues the indication according to the event, and the event occurs. The indication and a warning indication determine whether the warning indication is set to be required to be alerted. The audio adjusting device according to claim 3, wherein the processor further determines whether the warning needs to be stopped according to an alert closing instruction, and sets the alert indication to be no need to be alerted when it is determined that the alert needs to be stopped. The audio adjustment device according to claim 4, further comprising an alarm electrically connected to the processor, the alarm is configured to receive the warning indication, and issue an alert when the warning indication is set to be required to be alerted, and Stop the warning when the warning indicator is set to no warning. The audio adjustment device of claim 4, wherein the processor further reduces the size of the adjusted current audio sample as the obtained audio sample when the warning indication is set to be required to be alerted. Reference. The audio adjustment device of claim 1, wherein the processor adjusts the current input audio sample according to the size of the audio distortion sample to obtain the processed audio sample. The audio adjustment device of claim 1, wherein the processor subtracts the ambient audio sample from the previous input audio sample stored in the memory to obtain the audio distortion sample, and according to a gain The size of the current input audio sample is adjusted and the audio distortion sample is subtracted to obtain the processed audio sample. An audio adjustment method is applied to an audio adjustment system. The audio adjustment system includes a memory, an audio capture device, a processor, an output stage, and a speaker. The memory stores a previously input audio sample, the audio The extractor captures an ambient sound to obtain an environmental audio sample, and the output stage obtains an output audio sample according to a processed audio sample, the speaker plays the output audio sample, and the audio adjustment method is performed by the processor, and The method includes the following steps: (A) receiving a current input audio sample; (B) receiving the environmental audio sample; (C) obtaining an audio distortion sample according to the previously input audio sample and the environmental audio sample stored in the storage; And (D) obtaining the processed audio sample based on the audio distortion sample and the current input audio sample. The audio adjustment method according to claim 9, wherein the step (D) comprises the steps of: (D1) adjusting a size of the current input audio sample according to a size of the audio distortion sample; and (D2) according to the The adjusted current input audio sample is obtained to obtain the processed audio sample. The audio adjustment method according to claim 9, wherein the step (D) comprises the following substeps: (D1) adjusting a size of the current input audio sample according to a gain; and (D2) according to the adjusted current The audio sample and the audio distortion sample are input to obtain the processed audio sample. The audio adjustment method according to claim 10 or 11, further comprising a step (E) of setting a warning indication, and the step (E) comprises the following sub-steps after the sub-step (D1): (E1) determining whether to identify a specific event according to an identification indication, and if so, jumping to sub-step (E2), if not, jumping to sub-step (D2); (E2) according to at least one of a preset time period The audio distortion sample identifies whether the specific event occurs, and if so, jumps to sub-step (E3), and if not, jumps to sub-step (E6); (E3) sets an event continuation indication and an event occurrence indication, and is Setting the event continuation indication to be the same as the event occurrence indication, and then setting the event occurrence indication to yes; (E4) determining a first condition and a first according to the event continuation indication, the event occurrence indication, and the warning indication Whether one of the two conditions is true, if yes, skips to sub-step (E5), and if not, jumps to sub-step (D2), and the first condition is that the event continuation indication is set to no, the second The condition is that the event continuation indication is set to yes and the alert finger (E5) set the warning indication to be alerted, and reduce the size of the adjusted current input audio sample, and obtain the processed audio sample according to the reduced current input audio sample, and jump Go to sub-step (E7); (E6) set the event continuation indication, the event occurrence indication, the warning indication, and an alert shutdown indication, and set the event continuation indication, the event occurrence indication, and the warning closure indication to No, the warning indicator is set to no warning, and jumps to sub-step (D2); the step (E) further includes the following sub-steps after sub-steps (D2) and (E5): (E7) according to the The warning close indication determines whether the warning needs to be stopped. If yes, skip to sub-step (E8), if not, skip to step (A); and (E8) set the warning indication to no warning. The audio adjustment method according to claim 10 or 11, further comprising a step (E) of setting a warning indication, and the step (E) comprises the following sub-steps after the sub-step (D1): (E1) determining whether a specific event needs to be identified according to an identification indication, and if so, jumping to sub-step (E2), if not, jumping to sub-step (D2); (E2) according to at least one of the preset time periods An audio distortion sample identifies whether the specific event occurs, and if so, skips to sub-step (E3), and if not, jumps to sub-step (E6); (E3) sets an event continuation indication and an event occurrence indication, and First, the event continuation indication is set to be the same as the event occurrence indication, and then the event occurrence indication is set to YES; (E4) determining a first condition according to the event continuation indication, the event occurrence indication, and the warning indication Whether one of the second conditions is true, if yes, skips to sub-step (E5), and if not, jumps to sub-step (D2), and the first condition is that the event continuation indication is set to no, The second condition is that the event continuation indication is set to yes, and the The indication is set to be required to be alerted; (E5) the warning indication is set to be required to be alerted; (E6) the event continuation indication, the event occurrence indication, the warning indication, and an alert closure indication are set, and the event is continuously indicated. And the event occurrence indication and the warning closure indication are both set to No, and the warning indication is set to not require warning, and jumps to sub-step (D2); the step (E) further includes after the sub-step (D2) The following sub-steps: (E7) determine whether to stop the warning according to the warning off indication, if yes, skip to sub-step (E8), if not, skip to step (A); and (E8) set the warning indication to No warning is required.