KR102671183B1 - A method of controlling the volume of sound output from and electronic whiteboard according to changes in surrounding noise - Google Patents

Abstract

The present invention relates to a method for controlling the output value of sound output from an electronic whiteboard according to changes in ambient noise. The method comprises the steps of: (a) measuring an ambient noise value through a microphone connected to the electronic whiteboard in a wired or wireless manner; (b) calculating a new sound output value by inputting the ambient noise value measured in the step (a) to a calculation unit of the electronic whiteboard; and (c) outputting sound from the electronic whiteboard with the new sound output value calculated in the step (b) by control of a control unit in the electronic whiteboard.

Description

A method of controlling the volume of sound output from and electronic whiteboard according to changes in surrounding noise}

The present invention relates to a method of adjusting the sound output value output from an electronic whiteboard according to changes in surrounding noise, measuring the surrounding noise in real time or periodically, and adjusting the sound output value output from the electronic whiteboard according to the measured noise in real time. This relates to a method of adjusting the sound output value so that the listener can feel that the sound output from the electronic whiteboard changes naturally despite sudden or gradual changes in surrounding noise.

A display device is a device that processes video signals/video data input from the outside or stored internally through various processes and displays them as images on a display panel. Depending on the method, it can be implemented in various ways such as TV, monitor, portable media player, etc. do.

As technology advances, various functions are added and reinforced to such display devices. For example, the display device may be implemented as an electronic whiteboard equipped with a pointing device capable of touching a display panel or scanning a light beam.

In general, an electronic whiteboard refers to a device with a writing function that can input text, pictures, or shapes on a display panel using a touch means (e.g., electronic pen, body, etc.) and display it as an image.

Because electronic whiteboards enable interactive interaction with users, they are used in product exhibitions, promotional centers, museums, stores, route guidance, electronic classrooms, etc., and their scope of use is gradually expanding, and their size is also increasing.

In general, when using an electronic whiteboard, the sound output from the electronic whiteboard is manually adjusted in consideration of the space where the electronic whiteboard is used, the number of people listening, and surrounding noise. In other words, the sound is adjusted by operating a button or remote control mounted on the electronic whiteboard so that the sound is output suitable for the space in which it is used.

Unless there is a sudden change in the space where the electronic whiteboard is used (such as a sudden change in the number of people listening or ambient noise, etc.), it is common to maintain the sound output set at the start of use until the end of use.

However, when the number of listeners entering the space where the electronic whiteboard is used changes rapidly or the surrounding noise changes significantly, the inconvenience of having to manually adjust the sound output of the electronic whiteboard to suit each situation arises. For example, if the surrounding noise increases or the number of listeners suddenly increases, the sound output must be manually increased. If the sound output is already high and the surrounding noise becomes low or the number of listeners decreases, the sound output must be lowered again, etc. The inconvenience of having to manually adjust the sound output comes with it.

Accordingly, there is an urgent need for research into technical features that automatically adjust the sound output from electronic whiteboards according to changes in surrounding noise.

(Patent Document 1) KR 10-2430112 B

In order to solve the problems caused by the prior art described above, we would like to propose a method of automatically adjusting the output of sound from an electronic whiteboard according to changes in surrounding noise.

In order to solve the problems caused by the prior art described above, the method of adjusting the output of sound output from the electronic whiteboard according to changes in surrounding noise according to the present invention is as follows:

(a) measuring the ambient noise value through a microphone connected wired or wirelessly to the electronic whiteboard; (b) inputting the ambient noise value measured in step (a) to a calculation unit of the electronic whiteboard to calculate a new sound output value; And (c) sound may be output from the electronic whiteboard using the new sound output value calculated in step (b) by control from the control unit of the electronic whiteboard.

Preferably, step (b) includes: (b-1) inputting the ambient noise value to the calculation unit to calculate a predetermined fluctuating sound output value; And (b-2) may include the step of calculating a predetermined intermediate sound output value in the calculation unit by adding or subtracting the variable sound output value from the previous sound output value output from the electronic whiteboard.

Preferably, step (b) further includes the step (b-3) of calculating the new sound output value in the calculation unit according to Equation 1 below:

[Formula 1]

VN = max(VL , min(VC , VH))

In Equation 1, VN is the new sound output value, VL is the lowest sound output value preset on the electronic whiteboard, VC is the intermediate sound output value, and VH is the highest sound output value preset on the electronic whiteboard.

Preferably, in step (b-1), the variable sound output value is calculated by the calculation unit according to Equation 2 below,

[Formula 2]

VS = α*(NM - NS ₁ )

In Equation 2, VS is the variable sound output value, α is a predetermined coefficient that exceeds 0 and is less than or equal to 1, NM is the ambient noise value, and NS ₁ is the reference noise value set in the electronic whiteboard.

Preferably, the reference noise value is configured to be changeable from a previous reference noise value set before an arbitrary point in time to a new reference noise value set after the arbitrary point in time,

In Equation 2, NS ₁ is the previous standard noise value among the standard noise values,

The new reference noise value is calculated in the calculation unit using Equation 3 and Equation 4 below:

[Formula 3]

NC = max(NL , min(NS ₁ +VS , NH))

In Equation 3, NC is a predetermined intermediate standard noise value, NL is the lowest noise value preset in the electronic whiteboard, NS ₁ is the previous standard noise value, and VS is the ambient noise value at the arbitrary point in time. This is the fluctuating sound output value reflected and calculated, and NH is the highest noise value preset on the electronic whiteboard,

[Formula 4]

NS ₂ = NC-k*dN

In Equation 4, NS ₂ is the new reference noise value, NC is the intermediate reference noise value, k is a predetermined coefficient, and dN is the change value of the surrounding noise value during a certain unit time.

As a solution to the above-mentioned problem, the surrounding noise is measured in real time or periodically, and the sound output from the electronic whiteboard is automatically adjusted in real time or periodically according to the measured ambient noise, thereby improving the use of the electronic whiteboard. Convenience increases.

Accordingly, the sound output from the electronic whiteboard is automatically adjusted according to changes in surrounding noise, and the sound output from the electronic whiteboard changes naturally despite sudden or gradual changes in surrounding noise, which is good for the listener. As the sound output is adjusted so that it can be felt, the convenience of using the electronic whiteboard is further increased.

1 is a diagram schematically showing a flow chart of how the method according to the present invention operates.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

The description will be made with reference to FIG. 1 .

S100: Step where ambient noise values are measured

When the electronic whiteboard is operated and sound is output at the previous sound output value, the ambient noise value at the location where the electronic whiteboard is located can be measured through a microphone connected wired or wirelessly to the electronic whiteboard.

The microphone is built into the electronic whiteboard, but depending on the size of the electronic whiteboard, there may be multiple locations where the microphone is located. Alternatively, they may be positioned in multiple numbers, one at a certain distance from the electronic whiteboard.

In a multi-positioned state, the average or median value of the ambient noise values measured by each microphone is calculated in the calculation unit of the electronic whiteboard, and the final calculated average or median value is used as the ambient noise value to be used in a number of formulas to be described later. Of course, it can be applied.

Furthermore, by setting a certain limit distance from the electronic whiteboard and using the average or median value of the ambient noise measured by a microphone located at a distance greater than the certain limit distance as the ambient noise value, it can be applied to a number of formulas to be described later. am.

Here, the sound output value and ambient noise value may be the sound output value and ambient noise value in decibel (dB) units.

S200: Step where variable sound output value is calculated

The measured ambient noise value is input to the calculation unit so that the sound is reflected in the previous sound output value output from the electronic whiteboard and is finally output as a new sound output value, so that the fluctuating sound output value can be calculated preferentially.

In other words, the ambient noise value is measured while the electronic whiteboard is outputting sound at the previous sound output value, and the sound output value of the electronic whiteboard is changed according to the ambient noise value so that the sound output from the electronic whiteboard can be easily heard by the listener. In this case, the fluctuating sound output value is reflected in the previous sound output value, and a new sound output value can be calculated in the calculation unit, and the sound can be output from the electronic whiteboard with the sound output value changed to the new sound output value calculated in this way.

The fluctuating sound output value can be calculated in the calculation unit of the electronic whiteboard using Equation 2 below.

[Formula 2]

VS = α*(NM - NS ₁ )

In Equation 2, VS is the variable sound output value, α is a predetermined coefficient that exceeds 0 and is less than 1, NM is the measured ambient noise value, and NS ₁ is the reference noise value set in the electronic whiteboard.

In other words, a variable sound output value can be calculated by subtracting the standard noise value set in the electronic whiteboard from the measured ambient noise value and multiplying the resulting value by a certain coefficient.

The ambient noise value is measured in real time or periodically at any point in time, and when the ambient noise value is measured, the electronic whiteboard has already set the standard noise value and is outputting sound at the previous sound output value.

Thereafter, the ambient noise value measured at any point in time is reflected in Equation 2 described above, and a fluctuating sound output value can be calculated.

NS ₁ , described above, is the previous standard noise value set on the electronic whiteboard before an arbitrary point in time when the ambient noise value is measured, and NS ₂ , described later, is a new standard noise value set in the electronic whiteboard after an arbitrary point in time when the ambient noise value is measured. am. A detailed explanation will be provided later.

In Equation 2, α is a constant coefficient that can exceed 0 and be less than or equal to 1.

A new sound output value is calculated by reflecting the fluctuating sound output value in the previous sound output value, which will be described later. If the surrounding noise value changes significantly, the fluctuating sound output value may also change significantly, and when this greatly fluctuating fluctuating sound output value is reflected, the previous sound output value is calculated. A new sound output value is calculated with a large fluctuation range, and sound can be output with the new sound output value calculated in this way. In other words, if the surrounding noise value changes significantly, the sound output from the electronic whiteboard may suddenly become louder, which may cause discomfort in listening (such as being startled by the sudden loudness of the sound).

In order to minimize this inconvenience, α can be applied so that the calculated fluctuating sound output value can change gently even if the surrounding noise value changes significantly.

S300: Step where intermediate sound output value and new sound output value are calculated

During the process of calculating a new sound output value by reflecting the above-mentioned variable sound output value, an intermediate sound output value may be calculated in the calculation unit. That is, the above-described variable sound output value is added to or subtracted from the previous sound output value output from the electronic whiteboard, and a predetermined intermediate sound output value can be calculated in the calculation unit.

The sound output value of the electronic whiteboard needs to be increased or decreased by taking into account the degree to which the surrounding noise value increases or decreases. When the surrounding noise increases, the sound output value of the electronic whiteboard must be increased to increase audibility, and when the surrounding noise decreases, the sound output value of the electronic whiteboard must be lowered to minimize listening discomfort by lowering the high sound output value accordingly.

The intermediate sound output value can be calculated using Equation 5 below.

[Formula 5]

VC = VO + VS

In Equation 5, VC is the intermediate sound output value, VO is the previous sound output value of the electronic whiteboard, and VS is the variable sound output value described above.

That is, the intermediate sound output value can be calculated by adding or subtracting the variable sound output value from the previous sound output value.

The new sound output value can be calculated using Equation 1 by reflecting the lowest sound output value, highest sound output value, and intermediate sound output value preset on the electronic whiteboard.

[Formula 1]

VN = max(VL , min(VC , VH))

In Equation 1, VN is the new sound output value, VL is the lowest sound output value preset on the electronic whiteboard, VC is the middle sound output value, and VH is the highest sound output value preset on the electronic whiteboard.

In other words, the lowest value between the intermediate sound output value and the preset highest sound output value is selected, and the highest value is selected between the selected lowest value and the preset lowest sound output value. The selected highest value is set on the electronic whiteboard as the new sound output value. It can be.

With the audible range at the location where the electronic whiteboard is located, the sound output value of the electronic whiteboard is allowed to vary within the audible range, and if a sound output value outside the audible range is calculated, it is limited to the audible range. Since listening is inconvenient or audibility is very low when it is outside the audible range, listening inconvenience is minimized by limiting it to the audible range even when the new sound output value is calculated with significant changes due to changes in the surrounding noise value. Or to increase audibility.

S400: Step in which sound is output from the electronic whiteboard with a new sound output value

The ambient noise value measured at a certain point in time is reflected, and the previous sound output value before that point in time is changed to a new sound output value, so that the sound can be output from the electronic whiteboard. Of course, if there is no change in the surrounding noise value or the change is insignificant, the previous sound output value described above and the new sound output value may be the same.

Sound can be output from the electronic whiteboard by controlling the control unit of the electronic whiteboard with the new sound output value calculated through the above-described steps.

S500: Step where a new standard noise value is calculated

As described above, a new sound output value can be calculated by reflecting the ambient noise value measured at an arbitrary point in time. Afterwards, the ambient noise value measured in real time or periodically may be reflected again and the sound output value of the electronic whiteboard may change.

In calculating the above-mentioned variable sound output value, if there is no change in the standard noise value despite the change in the surrounding noise value and the resulting change in the sound output value of the electronic whiteboard, the fluctuating sound output value is not suitable for the change in the surrounding noise value. This may change, and as a result, the new sound output value may not change appropriately according to the change in the surrounding noise value, resulting in inconvenience in listening.

For example, if the standard noise value before a certain point in time is 5 dB, and the ambient noise value measured at that point in time is 9 dB, about 4 dB (ignoring α here) is added to the previous sound output value of 11 dB to create a new sound output value. The sound output value can be set to 15dB.

With the standard noise value unchanged (maintained at 5dB), if the ambient noise value measured again after a certain point is 10dB, about 5dB (ignoring α here) is added to 15dB, resulting in a new sound output value of 20dB. can be set. In other words, if the reference noise value does not change, a problem arises in which new accumulated sound output values are continuously calculated even if the change in the ambient noise value is minimal (in one example, the ambient noise value is still 9 to 10 dB, but as time passes, new sound output values are calculated). The sound output value is calculated from 15 to 20 and further increases from 20).

Therefore, the ambient noise value measured in real time or periodically must be reflected in the sound output value of the electronic whiteboard and at the same time, it must also be reflected in the standard noise value set for the electronic whiteboard.

The standard noise value set on the electronic whiteboard may be configured to be changeable from the previous standard noise value set before a certain point in time to a new standard noise value set after a certain point in time.

In Equation 2 and Equation 3, NS ₁ is the previous standard noise value, and NS ₂ in Equation 4, which will be described later, is the new standard noise value.

The new standard noise value can be calculated in the calculation unit using Equation 3 and Equation 4 below.

During the process of calculating a new standard noise value by reflecting the above-mentioned variable sound output value, an intermediate standard noise value may be calculated in the calculation unit.

[Formula 3]

NC = max(NL , min(NS ₁ +VS , NH))

In Equation 3, NC is a predetermined intermediate standard noise value, NL is the lowest noise value preset on the electronic whiteboard, NS ₁ is the previous standard noise value, and VS is calculated by reflecting the surrounding noise value at an arbitrary point in time. This is the variable sound output value, and NH is the highest noise value preset on the electronic whiteboard.

That is, the lowest value among the intermediate standard noise value and the preset highest standard noise value is selected, and the highest value among the selected lowest value and the preset lowest standard noise value is selected. The selected highest value is the intermediate standard noise value. It can be set on the electronic whiteboard.

With the audible range at the location where the electronic whiteboard is located, the range of the standard noise value set for the electronic whiteboard is determined to match the audible range. If the standard noise value is calculated outside the range of the set standard noise value, the set standard noise value is determined. This is to limit the range of values. If the calculated standard noise value is outside the range of the standard noise value, if the sound is output with a new sound output value calculated by reflecting the standard noise value outside the range, there will be discomfort in listening or the audibility will be very low, so surrounding noise Even when the standard noise value is calculated with significant changes due to changes in value, the purpose is to limit the standard noise value within the range of the standard noise value to minimize listening discomfort or increase audibility.

The new reference noise value can be calculated using Equation 4.

[Formula 4]

NS ₂ = NC-k*dN

In Equation 4, NS ₂ is a new reference noise value, NC is the above-mentioned intermediate reference noise value, k is a predetermined coefficient, and dN is a change value of the surrounding noise value during a certain unit time.

In other words, the new standard noise value is the standard noise value in which the change in the surrounding noise value is reflected in the intermediate standard noise value.

Even when the surrounding noise value fluctuates greatly, the fluctuating sound output value can be calculated with a gradual change by applying the above-described α. In other words, even if the surrounding noise value fluctuates greatly, the intermediate standard noise value (within the range of the standard noise value set for the electronic whiteboard) may change gently.

If this intermediate standard noise value is set as a new standard noise value, large changes in the surrounding noise value are not reflected, which may lead to inconvenience in listening.

For example, even when the range of change in ambient noise value during a certain unit time is large (change from 1 to 9 dB as an exception to the general case of change from 1 to 2 dB), the application of α keeps the fluctuating sound output value gently fluctuated. It is calculated, and accordingly, it is calculated without much change in the new standard noise value. Despite large fluctuations in the surrounding noise value (changes from 1 to 2 dB and then suddenly changes from 1 to 9 dB), due to the application of α, the fluctuation range is not reflected in the new standard noise value set on the electronic whiteboard, so subsequent There will be no significant change in the new sound output value.

When the ambient noise value is measured with a large fluctuation range, it is desirable for the sound to be output at a higher sound output value. For example, when the fluctuation range is 1 to 2 dB, the appropriate new sound output value is 10 dB, and when the fluctuation range is 7 to 8 dB, the appropriate new sound output value is preferably 16 to 18 dB. Nevertheless, if the new sound output value is 11dB due to the application of α, a problem occurs in which audibility becomes very low when the surrounding noise value suddenly rises high.

To solve this problem, when the level of noise decreases and then suddenly increases, listening discomfort can be minimized by keeping the sound output from the electronic whiteboard raised above a certain level in preparation for the noise rising at any moment. .

In other words, when the range of variation in the surrounding noise value is large, it is necessary to calculate the fluctuating sound output value to be larger. The fluctuating sound output value in Equation 2 is configured to become larger as the standard noise value decreases. If the surrounding noise value fluctuates significantly, the standard noise value can be reduced to calculate the fluctuating sound output value to be larger. . Accordingly, when the surrounding noise value changes significantly, a new sound output value can be calculated to be larger.

In other words, the value of applying a certain coefficient k to the change in ambient noise value for a certain unit time is reflected in the intermediate standard noise value, so that when the range of change in ambient noise value is large, a new sound output value is raised to produce a louder sound. It can be output as .

S600: Step in which a new standard noise value is set on the electronic whiteboard

The ambient noise value measured at an arbitrary point in time is reflected to calculate a fluctuating sound output value and a new sound output value, and a new standard noise value reflecting the calculated fluctuating sound output value can be calculated and set again on the electronic whiteboard. Based on a random point in time, the previous standard noise value is changed to a new standard noise value, and the fluctuating sound output value and new sound output value are calculated using the ambient noise value measured at another random point in time after the random point in time. This new standard noise value is calculated. This can be done in an applied manner.

S100 to S600 described above may proceed in real time or periodically. In other words, while sound is being output from the electronic whiteboard, the surrounding noise value is measured in real time or periodically, the sound is output as a new sound output value that reflects this ambient noise value, and similarly, a new standard noise is reflected in this ambient noise value. The value can be configured to be set on the electronic board. Afterwards, the re-measured ambient noise value is reflected, and sound is output at a new standard noise value in real time or periodically, and a new standard noise value can be set.

Above, the present invention has been described with reference to the embodiments shown in the drawings so that those skilled in the art can easily understand and reproduce the present invention. However, these are merely illustrative examples, and various modifications and equivalent alternatives can be made by those skilled in the art from the embodiments of the present invention. It will be appreciated that embodiments are possible. Therefore, the scope of protection of the present invention should be determined by the scope of the patent claims.

Claims (5)

In a method of adjusting the output of sound output from an electronic whiteboard according to changes in surrounding noise,
(a) measuring the ambient noise value through a microphone connected wired or wirelessly to the electronic whiteboard;
(b) inputting the ambient noise value measured in step (a) to a calculation unit of the electronic whiteboard to calculate a new sound output value; and
(c) comprising the step of outputting sound from the electronic whiteboard with the new sound output value calculated in step (b) by control from the control unit of the electronic whiteboard,
In step (b),
(b-1) inputting the ambient noise value to the calculation unit to calculate a predetermined fluctuating sound output value;
(b-2) calculating a predetermined intermediate sound output value in the calculation unit by adding or subtracting the variable sound output value from the previous sound output value output from the electronic whiteboard; and
(b-3) The new sound output value includes the step of calculating in the calculation unit according to Equation 1 below,
[Formula 1]
VN = max(VL , min(VC , VH))
In Equation 1, VN is the new sound output value, VL is the lowest sound output value preset on the electronic whiteboard, VC is the intermediate sound output value, and VH is the highest sound output value preset on the electronic whiteboard,
In step (b-1), the variable sound output value is calculated in the calculation unit according to Equation 2 below,
[Formula 2]
VS = α*(NM - NS ₁ )
In Equation 2, VS is the variable sound output value, α is a predetermined coefficient that exceeds 0 and is less than or equal to 1, NM is the ambient noise value, NS ₁ is the reference noise value set in the electronic whiteboard,
The reference noise value is configured to be changeable from a previous reference noise value set before an arbitrary point in time to a new reference noise value set after the arbitrary point in time,
In Equation 2, NS ₁ is the previous standard noise value among the standard noise values,
The new reference noise value is calculated in the calculation unit using Equation 3 and Equation 4 below:
[Formula 3]
NC = max(NL , min(NS ₁ +VS , NH))
In Equation 3, NC is a predetermined intermediate standard noise value, NL is the lowest noise value preset in the electronic whiteboard, NS ₁ is the previous standard noise value, and VS is the ambient noise value at the arbitrary point in time. This is the fluctuating sound output value reflected and calculated, and NH is the highest noise value preset on the electronic whiteboard,
[Formula 4]
NS ₂ = NC-k*dN
In Equation 4, NS ₂ is the new reference noise value, NC is the intermediate reference noise value, k is a predetermined coefficient, and dN is the change value of the surrounding noise value during a certain unit time.
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