KR20180014968A - Apparatus and Method for Automatically Optimizing Volume Reflecting Deviation of Speaker - Google Patents

Abstract

The present invention relates to an apparatus and a method for automatically optimizing a volume according to the deviation of a speaker in an acoustic system having two or three channels of speakers and a microphone. More particularly, the present invention relates to an apparatus and a method for automatically optimizing a volume according to the deviation of a speaker, the apparatus including: (A) an induction part for inducing the same output with a time difference from each of the speakers; (B) a calculation part for receiving the output of each of the speakers inputted to the microphone and calculating the sound pressure of each of the speakers; and (C) an adjusting part for adjusting the output of each of the speakers to input the same sound pressure from each of the speakers to the microphone in consideration of differences in the calculated sound pressures of the speakers. It is possible to automatically optimize audio output even if the operating volumes of the speakers in the acoustic system are not the same.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for automatically optimizing a volume according to a speaker variation,

The present invention relates to a method for automatically optimizing audio output in response to a performance deviation of a speaker depending on a position of a speaker and a position of a speaker in an acoustic system having two or three channels of speakers and one or more microphones.

At this time, the sound system includes not only a simple sound system but also a home theater system, a projection system, an HDTV, a digital TV, and a smart TV.

With the development of multimedia technology based on advanced digital signal processing technology, high quality, multi-function display devices (projection system, HDTV, digital TV, smart TV, etc.) of large screen are becoming popular. In keeping with the development of these visual aspects, the audio system also supports rich and realistic audio with multi-channel speakers such as 5.1 channel and 7.1 channel.

As is well known, it is possible to use a multi-channel speaker, especially a front channel (FC), a front light (FR), a front left (FL), a rear right (RR), a rear left (RL) and a woofer . The audio system decodes the audio signal, converts it into a 5.1-channel signal, and outputs the signal of each channel to the corresponding speaker so that the listener can listen to the sound output through the speaker.

Optimizing the output of the audio system (including the A / V system) is a very important factor for ensuring three-dimensional and realistic sound. In the case of multi-channel audio systems, the sound / system expert sets the setup position, audio output level, and delay time of each speaker when installing the first product. However, if you change the system position by moving or changing the internal structure, I had to do the setting myself. However, it is very difficult and cumbersome for an untrained user to set the position, output level and delay time of each speaker individually, so it is common to set the 'roughly' in practice or all the speakers to the front in a line. However, when using the audio system set to 'roughly', there is a problem such as feeling a sense of heterogeneity in the sound itself.

On the other hand, even when setting by a specialist, since the listener is set on the assumption that the listener is at the center position at the same distance from each speaker, when listening to the sound while moving to a position other than the center position of each speaker, Lt; / RTI >

Various techniques have been proposed to solve this problem.

When an audio system is set, an output value of each speaker for each user position is stored in advance, and when a user-specified position is designated (for example, a remote controller is operated), the output value of each speaker And outputting the extracted signal under the corresponding condition. However, this is also not realistic because it is necessary to set up a specialist in the beginning and the user has to perform a very complicated operation of storing the speaker output value by position when moving the speaker.

Open Patent Publication No. 10-2005-0056647 discloses a method of mounting a position sensor on each speaker, monitoring and tracking the position of the listener two-dimensionally using these position sensors, and detecting the position of the front left and right speakers and the rear left and right speakers And an audio system for adaptively and automatically controlling the output level and the delay time. According to this, a special speaker equipped with a position sensor must be installed. In the beginning, it is necessary to set up a specialist, and when one speaker is moved, the whole system must be set again.

A method of rotating a speaker to fit a position of a user is disclosed in Japanese Laid-Open Patent Publication No. 10-2006-0028962 by a driving unit for rotating the speaker and a detection unit for detecting the movement of the user. According to this, there is a special speaker with a rotation driving part and a detecting part, and it does not mention about the output or the time delay according to the position of the user, but simply the direction of the speaker is different. Also, in this case, the initial setting is necessary, and if one speaker is moved or the direction changes, it should be set again.

That is, according to the conventional art as described above, the speaker setting operation is very difficult for ordinary users without the help of the sound / system expert. Therefore, most users can arrange the speakers roughly, And the sound system is utilized. Also, if the user does not change the setting condition, the sound quality is always changed according to the user's position by outputting the same sound even if the user's position is changed.

On the other hand, as the sound signal processing technology becomes more sophisticated, ordinary users who are not a movie theater or a high-end user can hear a magnificent and realistic sound even with a 2-channel or 3-channel speaker system.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-2005-0032929 ≪ RTI ID = 0.0 > [Patent Document 10] 2006-0028962

The present invention relates to an automatic volume optimization method for automatically optimizing audio output even when the operating volume of speakers is not the same in an acoustic system having two or three channels of speakers and a microphone.

According to an aspect of the present invention, there is provided an apparatus for automatically optimizing a volume according to a speaker deviation in an acoustic system having two or three channels of speakers and a microphone, the apparatus comprising: (A) Guide portion; (B) a calculator receiving the output of each speaker input to the microphone and calculating the sound pressure of each speaker; (C) an adjusting unit for adjusting the output of each speaker so that the same sound pressure is inputted from each speaker to the microphone in consideration of a difference in sound pressure of each of the calculated speakers; and will be.

As described above, according to the present invention, even if the position of the speaker is changed, the volume according to the speaker deviation is automatically controlled so that the sweet spot of the speaker is formed at a specific position, so that the user can listen to the optimum sound without any operation.

According to the present invention, even if the position of the user (celadon) changes, the sweet spot of the speaker is automatically controlled to be formed at the position where the user is located, so that the user can listen to the optimum sound at any position.

Thus, the present invention enables automatic speaker setting without the help of a sound / system expert.

1 is a conceptual diagram of an acoustic system having a 2-channel speaker and a microphone, and a volume automatic optimizing apparatus according to a speaker variation according to the present invention.
Figs. 2A to 2C are conceptual diagrams showing examples of a planar positional relationship between a main body of a sound system, a speaker and a user, in an acoustic system having a detachable two-channel speaker and a microphone. Fig.
3 is a conceptual diagram showing an example of the planar positional relationship between the main body of the acoustic system, the speaker and the user in the acoustic system in which the left and right microphones ML and MR and the position detection unit C are mounted.
FIG. 4 is a flowchart illustrating a method of setting a speaker-set spot using a volume automatic optimizing apparatus according to a speaker variation in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings illustrate only the contents and scope of technology of the present invention, and the technical scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention based on these examples.

In the present invention, the term "acoustic system" is a concept including not only a simple sound system but also various audio / video devices having a sound related device such as a home theater system, a projection system, an HDTV, a digital TV, and a smart TV.

As described above, the present invention relates to an apparatus and method for automatically optimizing a volume according to a speaker deviation in an acoustic system having two or three channels of speakers and one or more microphones including an induction unit, a calculation unit, and a control unit.

<Invention of Automatic Volume Optimization Device According to Speaker Deviation in Acoustic System>

In the present invention, the speaker may be detachable or integral with the acoustic system integrally. If the speaker is a detachable speaker, it can include both wired and wireless.

In the present invention, the microphone may be mounted in an acoustic system, but since the 'automatic volume optimizing device according to speaker deviation' according to the present invention is included in the acoustic system, It does not exclude being mounted.

In the present invention, the induction unit serves to induce a constant output with a time difference from each speaker.

(1) receiving the sound pressure intensity detected by the microphone with respect to the output sound pressure induced by each speaker, (2) comparing the sound pressure differences of the respective speakers, and comparing the sound pressure differences detected at the predetermined reference point (for example, between the microphone and the microphone) Calculate the sound pressure of each speaker and calculate the calibration output ratio of each speaker.

The controller adjusts the output ratio of each speaker according to the calibration output ratio information of each speaker determined by the calculator.

In the present invention, 'adjusting the output' means adjusting the output of the speaker so that the same sound pressure is applied to each speaker when the sound source is the same sound source at a certain point by correcting the sound pressure loss due to the difference in distance between the specific point and each speaker.

On the other hand, when the output sound pressure (W) (sound energy emitted per unit time) from the speaker (sound source), which is seen as a point sound source outputting a hemispherical wave, the distance r, The relationship can be expressed by the following equation.

(식 1)

(Equation 1)

The relationship between the velocity (v) of the sound wave and the time (t) of the speaker to the microphone can be expressed by the following equation.

(식 2)

(Equation 2)

1 is a conceptual diagram of an acoustic system having a two-channel speaker and a microphone, and a volume automatic optimizing apparatus according to a speaker variation according to the present invention, and FIG. 1 is a conceptual diagram showing an acoustic system having a detachable two- And conceptual examples of the planar positional relationship between the users are shown in Figs. 2A to 2C. 2A to 2C, the setting device according to the present invention is not shown. In the figure, M denotes a microphone, S1 and S2 denote two speakers, U denotes a user, and a rectangle denotes a sound system body.

The operation of the automatic volume optimizing apparatus according to the speaker deviation according to the present invention will be described with reference to FIG.

First, when the induction unit outputs a signal such that an output of, for example, 50 dB is output to S1, the sound pressure output from S1 is input to the microphone at, for example, 45 dB. Subsequently, when the induction unit outputs a signal such that an output of, for example, 50 dB is output to S2 at a time difference, the sound pressure output from S2 is input to the microphone at, for example, 41 dB.

Then, the calculator compares the sound pressure differential (I ₁ = 45, I ₂ = 41) detected by the microphone with respect to the same output sound pressure (W = 50) derived from each speaker, Calculate the relative distances (r ₁ , r ₂ ) of the speakers.

(식 3)

(Equation 3)

According to this example, the distance ratio of the two speakers is r ₂ / r ₁ = 1.048.

Next, the output sound pressures (W ₁ , W ₂ ) are calculated such that the detected sound pressure I at a specific point becomes equal.

(식 4)

(Equation 4)

The control unit adjusts the output of each speaker in accordance with the relative speaker output ratios (W ₁ , W ₂ ) calculated from Equation (3). Assuming that the microphone is in a specific position in the above example, the calibration output ratio of the two speakers is W ₂ / W ₁ = 1.098. In other words, the output of the S2 speaker should be increased by about 10% compared to S1, so that the sweet spot is set at a specific position.

If necessary, the delay time can be calculated and corrected according to Equation 2. 'Adjusting the delay time' means correcting the difference of the sound arrival time according to the difference of distance between the specific point and each speaker, so that the output time of the speaker is adjusted so that the sound pressure is felt at the same moment at each speaker when the sound source is the same at a specific point It is regulated. However, since the difference in distance between each speaker and the user is usually within 1 to 2 m, the delay time is about 0.003 to 0.006 sec. Therefore, the delay time correction is not considered in the following.

On the other hand, when the microphone is one, the optimizer according to the present invention can not recognize the left and right speakers, for example. Therefore, in this case, it is preferable to add (D) a toggle portion for replacing a signal input to the speaker by the user's selection.

The sound system according to the present invention may be combined with a video system such as a projection system, an HDTV, a digital TV, and a smart TV.

In the present invention, when there are two or more microphones of the acoustic system, the relative distance and direction of each speaker can be accurately calculated and corrected (refer to FIG. 3).

Fig. 3 shows an example in which the left and right microphones ML and MR are mounted. In this case, for example, the output of S1 or S2 is inputted to the left and right microphones ML and MR with different sound pressure and delay time. Therefore, the actual distance and direction of each speaker can be determined by the calculation of the calculation unit.

In the automatic volume optimizing apparatus according to the present invention as described above, the position at which the sweet spot is set is fixed to a position (user predicted position) at a distance of 2 to 3 m from the front of the normal sound system. Therefore, even if the position of the speaker is changed, the volume according to the speaker deviation is automatically controlled so that the sweet spot of the speaker is formed at the user expected position, so that the user can listen to the optimum sound without any operation. However, if the user is in a location other than the expected location, the optimal sound is not provided.

Therefore, the present invention further includes a position detector for detecting the distance between the system user and the sound system, and the controller adjusts the output of each speaker so that the sweet spot is set at the position of the user detected by the position detector. It is desirable to be able to adjust the delay time. The sweet spot can be arbitrarily changed by adjusting the output (W ₁ , W ₂ ) of each speaker and the delay time based on Equation 1 and Equation 2 above.

That is, when the current position of the user is detected by the position detection unit, the output (and delay time) of each speaker is controlled so that a sweet spot can be formed at the position of the user so that the user can feel the optimum sound.

At this time, the position detector may apply various sensors that are known at present. Smart electronic devices such as smart TVs have the ability to sense up to the user's motion, so they can use it. For example, in the setting apparatus according to the present invention, the position detection unit may be a camera system that recognizes a human face and its position and distance.

<Invention on Automatic Volume Optimization Method According to Speaker Deviation in Acoustic System>

The present invention also relates to a method of automatically optimizing a volume according to a speaker deviation using the automatic volume optimizing apparatus according to the speaker variation described above. This includes an output inducing step, a calibration output non-computing step, and an output ratio adjusting step.

In the present invention, the output inducing step is performed by the output inducing unit, and when the power of the sound system is turned on, the same output is induced in each speaker with a time difference.

The calibration output non-calculating step performed by the calculating unit includes: (1) receiving the sound pressure intensity detected by the microphone with respect to the output sound pressure induced by each speaker, (2) comparing the sound pressure differences of the respective speakers, The center between the microphone and the microphone) and calculating the calibration output ratio of each speaker.

The output ratio adjustment step is performed by an adjustment unit, which adjusts the output ratio of each speaker according to the calibration output ratio information of each speaker calculated above.

A method for automatically optimizing a volume according to a speaker deviation using a volume automatic optimizing apparatus according to a speaker deviation having a position detecting unit for detecting a distance and a direction of a system user at the reference point includes the following steps: Speaker position determination step, user position detection step, speaker-user distance direction determination step, calibration output non-calculation step, and output ratio adjustment step (see FIG.

First, when the power of the acoustic system is turned on, the induction unit induces a predetermined output with a time difference to each speaker (output inducing step). Then, the calculator receives the sound pressure of each speaker inputted to the microphone, compares the sound pressure difference of each speaker, and determines the distance, the distance and the direction of each speaker at the reference point (speaker positioning step).

In addition, the position detecting unit detects the distance, the distance and the direction of the system user at the reference point at predetermined time intervals when the power of the sound system is turned on (user position detecting step).

The calculation unit then determines the distance or the distance and direction between each speaker and the user from the distance or distance and direction information of each speaker at the reference point and the distance or distance and direction information of the system user The calibration output ratio of each speaker is calculated so that the sweet spot is set at the user position based on the distance or distance between each speaker and the user and the direction information.

The adjusting unit adjusts the output ratio of each speaker according to the calculated correction output ratio information of each speaker (the output ratio adjusting step).

However, when the degree of position change and the time are equal to or more than a predetermined threshold value (for example, when the user moves for more than 30 cm and stays for more than 5 seconds), the calibration output It is also good to perform the non-calculation step.

Claims (4)

An automatic volume optimizing apparatus according to a speaker deviation in an acoustic system having two or three channels of speakers and a microphone,
(A) an induction unit for inducing the same output with a time difference between the speakers;
(B) a calculator receiving the output of each speaker input to the microphone and calculating the sound pressure of each speaker;
(C) an adjusting unit adjusting the output of each speaker so that the same sound pressure is input from each speaker to the microphone in consideration of a difference in sound pressure of each of the calculated speakers;
Automatic volume optimization with speaker variation included.
The method according to claim 1,
(D) a toggle unit for replacing a signal input to the speaker by a user's selection;
Wherein the automatic volume optimization apparatus further comprises:
3. The method according to claim 1 or 2,
Wherein the sound system is coupled to an imaging system.
A method of automatically optimizing a volume according to a speaker deviation using a volume automatic optimizing apparatus according to a speaker deviation in an acoustic system according to claim 1 or 2,
(A) when the power of the acoustic system is turned on, inducing the same output with a time difference to each speaker;
(B) receiving the output of each speaker input to the microphone and calculating the sound pressure of each speaker;
(C) adjusting the output of each speaker so that the same sound pressure is input from each speaker to the microphone in consideration of the calculated difference in sound pressure of each speaker;
A method for automatically optimizing a volume according to a speaker variation included.

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