KR20230076978A - Acoustic room and method for obtaining BRIR using the same - Google Patents

Abstract

According to one embodiment, in a sound chamber including a floor, side walls and a ceiling, an inner wall of the ceiling including a glass wool layer; an inner wall of the side wall including the glass wool layer; and an inner wall of the floor including the glass wool layer, wherein at least a part of the first sound output from a speaker installed outside the side wall is reflected by the glass wool layer of the side wall, and is placed into a microphone placed at an arbitrary position in the sound chamber. At least a part of the second sound input and output from the speaker installed outside the ceiling is reflected by the glass wool layer of the floor and inputted to the microphone placed at an arbitrary position in the sound chamber, and the first sound of the sidewall The acoustic chamber may be provided with a higher reflectance than the reflectance of the floor of the second sound.

Description

Acoustic room and method for obtaining BRIR using the same {Acoustic room and method for obtaining BRIR using the same}

The present application relates to a sound chamber for obtaining a binaural transfer function with improved positional accuracy and a BRIR acquisition method using the same.

Stereophonic sound refers to sound in which spatial information is added to sound so that a listener can perceive a three-dimensional sense of direction, distance, and space when hearing sound.

Binaural rendering is used to add spatial information to sound provided through a headset or earphones. Binaural rendering means filtering the head transfer function to sound in order to create stereoscopic sound.

In order to provide more realistic 3D sound to listeners through binaural rendering, it is important to generate an accurate head transfer function. In particular, since the 'reflection characteristics' of the space where the head transfer function is acquired affect the quality of the head transfer function, the characteristics of the space where the head transfer function is acquired have a great influence on the externalization and location accuracy of the rendered sound source. do.

Specifically, if the architectural acoustic characteristics of the space where the head transfer function is acquired do not implement an appropriate level of reflection (ex., an anechoic room), a problem occurs in that a head transfer function with poor distance, direction, and reproducibility is generated, and the head When the architectural acoustic characteristics of the space where the transfer function is acquired have an excessive level of reflection (ex., reverberation room), a specific head transfer function including many reflected sounds has already been acquired, and various 3D spatial sound renderings by post-processing are possible. A problem arises that is not possible.

Therefore, in order to obtain a head transfer function with improved positional accuracy (eg, including only 10 frames of early reflection), it is essential to provide a sound chamber designed in consideration of stereophonic sound characteristics.

One problem to be solved in the present application is to provide a sound chamber for acquiring a binaural transfer function with improved positional accuracy and a BRIR acquisition method using the same.

The problem to be solved is not limited to the above-described problems, and problems not mentioned will be clearly understood from this application to those of ordinary skill in the art to which this application belongs.

According to one embodiment, in a sound chamber including a floor, side walls and a ceiling, an inner wall of the ceiling including a glass wool layer; an inner wall of the side wall including the glass wool layer; and an inner wall of the floor including the glass wool layer, wherein one or more speakers are installed on the outside of the ceiling, one or more speakers are installed on the outside of the sidewall, and on the inner wall of the floor, below the glass wool layer. A sand layer is disposed, a cork layer is disposed on the glass wool layer, a plywood is disposed between the glass wool layer and the cork layer, and at least a part of the first sound output from a speaker installed outside the side wall is transmitted to the side wall. At least a part of the second sound, which is reflected by the glass wool layer of the sound chamber and inputted to a microphone placed at an arbitrary position in the sound chamber and output from a speaker installed outside the ceiling, is reflected by the glass wool layer of the floor and is input to a microphone placed at an arbitrary position in the sound chamber. An acoustic chamber may be provided in which a reflectance of the sidewall of the first sound is greater than a reflectance of the floor of the second sound.

The thickness of the cork layer is thinner than that of the glass wool layer, and a sound chamber may be provided.

The thickness of the sand layer is thinner than that of the glass wool layer, and a sound chamber may be provided.

The thickness of the cork layer is thinner than the thickness of the sand layer, and a sound chamber may be provided.

A sound chamber may be provided in which the glass wool layer of the ceiling, the glass wool layer of the sidewall, and the glass wool layer of the floor have the same thickness.

A sound chamber may be provided in which the thickness of the glass wool layer is 100T or less, the thickness of the cork layer is 20T or less, and the thickness of the sand layer is 50T or less.

According to an embodiment, in the BRIR acquisition method performed in the sound chamber of claim 1, the first microphone installed in the left ear of the person in the sound chamber according to the impulse output through the first speaker installed outside the side wall. 1 acquiring a sound source; obtaining a second recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the first speaker; Acquiring a BRIR set corresponding to the location of the first speaker based on the first recording sound source and the second recording sound source, wherein the BRIR set includes a first BRIR for the left ear and a second BRIR for the right ear. box-; obtaining a third recording sound source through the first microphone installed in the left ear of the person in the sound chamber according to an impulse output through a second speaker installed outside the ceiling; obtaining a fourth recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the second speaker; and obtaining a BRIR set corresponding to the location of the second speaker based on the third recording sound source and the fourth recording sound source.

The solution to the problem is not limited to the above-described solution, and solutions not mentioned will be clearly understood from this application to those of ordinary skill in the art to which this application belongs.

According to an embodiment of the present application, an acoustic chamber capable of acquiring BRIR with improved spatial feeling and improved utilization of binaural rendering and a BRIR acquisition method using the same may be provided.

According to an embodiment of the present application, an acoustic chamber capable of acquiring an optimal binaural transfer function by being designed to generate less floor reflection sound than side reflection sound and a BRIR acquisition method using the same may be provided.

Effects of the invention are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from this application.

1 is a diagram of a monaural cue according to an exemplary embodiment.
2 is a diagram of a method for obtaining a binaural transfer function according to an embodiment.
3 is a diagram of a structure of an ear according to an embodiment.
4 is a view related to the structure of a sound chamber according to an embodiment.
5 is a diagram for explaining characteristics of a BRIR according to an embodiment.
6 is a diagram for explaining a structure of a sound chamber for obtaining a BRIR according to an embodiment.
7 is a diagram of an apparatus for generating a binaural transfer function according to an embodiment.

Since the embodiments described in this application are intended to clearly explain the spirit of this application to those skilled in the art to which this application belongs, it is not limited by the embodiments described in this application, and the scope of this application is It should be construed as including modifications or variations that do not depart from the spirit of the present application.

The terminology used in this application has been selected as a general term that is currently widely used as much as possible in consideration of the function in this application, but it may vary depending on the intention, custom, or the emergence of new technology of those skilled in the art to which this application belongs. can However, in the case where a specific term is defined and used in an arbitrary meaning, the meaning of the term will be separately described. Therefore, the terms used in this application should be interpreted based on the actual meaning of the term and the overall content of the present application, not simply the name of the term.

The drawings of the present application are intended to easily explain the present application, and the shapes shown in the drawings may be exaggerated as necessary to help the understanding of the present application, so the present application is not limited by the drawings.

In this application, if it is determined that a detailed description of a known configuration or function related to the present application may obscure the gist of the present application, detailed description thereof will be omitted if necessary. In addition, numbers (eg, first, second, etc.) used in the description process of the present application are only identification symbols for distinguishing one component from another component.

A person recognizes a sense of distance, direction, and space for sound through various clues contained in sound. The clues may be largely divided into binaural cues and monaural cues.

The binaural cue recognizes the difference between the signals entering both ears. The interaural level difference (ILD) for the level difference of the binaural signal, and the interaural time difference (ITD) for the time difference. , there are quantities for correlation, such as interaural coherence,

Monaural cues are perceptions of the characteristics of the signal itself with one ear. Even the same sound tends to be reinforced (peak generation) or attenuated (notch generation) in a specific frequency region due to the filtering effect of the body characteristics such as the head, auricle, and shoulder, depending on the altitude at which it is generated. From this change in frequency characteristics, a person can recognize the sound generation altitude.

The binaural transfer function is a function expressing a correlation between sound signals according to body characteristics such as a person's head, auricle, and shoulder, and includes information on a binaural cue and a monaural cue. As described above, the monaural cue used to recognize the height of the sound appears in the form of a notch in the binaural transfer function. For example, referring to FIG. 1, the sound generated from the front (0 °) and the sound generated from a higher position (+45 °) or lower position (-45 °) have different notches on the binaural transfer function, A person recognizes the height of a sound by using the feature that the notch changes.

If binaural rendering is performed using an accurate binaural transfer function, more realistic 3D sound can be provided to the listener. However, the characteristics of the binaural transfer function are very different for each individual due to different head sizes, face shapes, and auricle shapes. In order to use an accurate binaural transfer function for each individual, it is necessary to acquire a binaural transfer function for each individual, but it is difficult to obtain a binaural transfer function for each individual in reality.

Therefore, it is common to generate one or several standard binaural transfer functions to provide realistic stereoscopic sound to various listeners and perform binaural rendering using them to provide stereophonic sound. Due to ease of use, it is common to place a microphone on a dummy head or human concha to obtain a binaural transfer function and generate stereophonic sound based on it.

On the other hand, the binaural transfer function, like the Head Related Transfer Function (HRTF or Head Related Impulse Response, HRIR), is measured in an anechoic chamber or simulated in an anechoic chamber situation to reflect only body characteristics such as the shape of the head and ears. can be a function Alternatively, the binaural transfer function is a BRIR (Binaural Room Impulse Response) or BRTF (Binaural Room Transfer Function), which is a function in which not only the direction of sound but also the characteristics of the reproduction space are reflected, that is, the head transfer function reflects the characteristics of the reproduction space. can Alternatively, the binaural transfer function may be another transfer function similar to head transfer function, BRIR, BRTF, etc.

Prior to describing the design of an acoustic chamber for obtaining a binaural transfer function with an improved sense of space and a BRIR acquisition method using the same, a method for obtaining a binaural transfer function will be described.

2 is a diagram for explaining a method for obtaining a binaural transfer function according to an exemplary embodiment. Referring to FIG. 2 , the test subject is located in a predetermined space (room) in which a plurality of speakers are installed, and at this time, a microphone is located near each of both ears of the test subject. Sounds such as impulse, pink noise, and white noise are reproduced through the speaker, and the reproduced sound reaches the microphone directly without being reflected (direct sound) or reaches the microphone after being reflected on a wall or an object (reflection sound) and can be recorded. there is.

When sound is reproduced and recorded for each speaker, a binaural transfer function corresponding to each speaker can be obtained. The position of the speaker can be expressed as a position relative to the position of the subject (eg, azimuth angle, elevation angle, etc.), and thus a binaural transfer function for a specific position relative to the subject can be acquired. In the present specification, a plurality of binaural transfer functions obtained correspondingly to a plurality of positions are referred to as a binaural transfer function set. In addition, since the microphones are located at each of the ears of the test subject, a binaural transfer function corresponding to the left ear and a binaural transfer function corresponding to the right ear are obtained for each position. In this specification, the binaural transfer function corresponding to the left ear and the binaural transfer function corresponding to the right ear are collectively referred to as a binaural transfer function pair. That is, one binaural transfer function set includes n binaural transfer function pairs corresponding to n positions, and each binaural transfer function pair is a binaural transfer function corresponding to the left ear and a binaural transfer function corresponding to the right ear. Include the corresponding binaural transfer function. For example, in the case of FIG. 2, one binaural transfer function set includes 18 binaural transfer function pairs corresponding to each of the 18 positions, and each binaural transfer function pair corresponds to the left ear. It includes a real transfer function and a binaural transfer function corresponding to the right ear.

Referring to FIG. 3 , a binaural transfer function may be acquired by recording a sound arriving at or near the concha of the subject's ear (hereinafter referred to as a “concha position”). In this specification, a binaural transfer function obtained by recording a sound arriving at a concha position is referred to as a concha binaural transfer function. Accordingly, the concha binaural transfer function corresponding to the left ear and the concha binaural transfer function corresponding to the right ear may be collectively referred to as a concha binaural transfer function pair.

A microphone for recording a sound reaching the concha position may be provided in various forms that can be worn by a subject. Although not separately shown, the microphone may be provided as an in-ear type inserted into the ear hole of the test subject. In this case, when the test subject inserts and wears the in-ear type recording device including the microphone into the ear hole, the microphone may be located at or near the test subject's concha. Accordingly, the sound reproduced from the speaker may be recorded through the microphone at or near the test subject's concha.

An HRTF database can be obtained by recording the sound output through a speaker installed in an anechoic/semi-anechoic chamber through a microphone.

Hereinafter, the structure of a sound chamber that can be used to acquire a BRIR will be described. For sound image externalization, optimal BRIR must be obtained to render and provide it to maximize listener satisfaction. Therefore, the structure for designing a sound room is a very important factor in obtaining a binaural transfer function.

4 is a view related to the structure of a sound chamber according to an embodiment.

The acoustic chamber may include a floor 1000 , side walls 2000 and a ceiling 3000 . In other words, the sound chamber described in this application includes a floor 1000 formed in the direction of gravity, a side wall 2000 formed at an edge formed based on the floor 1000, and a ceiling 3000 disposed on the side wall 2000. can include

The floor 1000 may include a cork layer 1100, a plywood layer 1200, a glass wool layer 1300, and a sand layer 1400. The sidewall 2000 may include a gypsum board layer 2100, a glass wool layer 2200, and a wood wool board layer 2300. The ceiling 3000 may include a gypsum board layer 3100, a glass wool layer 3200, and a wood wool board layer 3300.

A cork layer 1100 may be positioned on the glass wool layer 1300 . A sand layer 1400 may be positioned under the glass wool layer 1300 . A plywood layer 1200 may be positioned between the cork layer 1100 and the glass wool layer 1300 . The sand layer 1400, the glass wool layer 1300, the plywood layer 1200, and the cork layer 1100 may be sequentially stacked. Here, the meaning of 'stacked' in order is that, for example, the cork layer 1100 is positioned on the plywood layer 1200, but no material is placed between the plywood layer 1200 and the cork layer 1100. doesn't mean it isn't

The floor 1000 may include a glass wool layer 1300 having substantially the same thickness as the glass wool layer 2200 included in the sidewall 2000 . The floor 1000 may include a glass wool layer 1300 having substantially the same thickness as the glass wool layer 3200 included in the ceiling 2000 . The sidewall 2000 may include a glass wool layer 2200 having substantially the same thickness as the glass wool layer 3200 included in the ceiling 3000 .

According to one embodiment, the thickness of the glass wool layers 1300, 2200, and 3200 may be selected from a range of 50T or more and 150T or less. According to the improved embodiment, the thickness of the glass wool layers 1300, 2200, and 32000 may be selected from a range of 75T or more and 125T or less. In spatial sound, the thickness of the glass wool layers 1300, 2200, and 3200 is a very important factor in determining the degree of acquisition of reflected sound sources, and a difference of 1 to 10T can have a great effect on the location accuracy of the acquired BRIR. .

As a specific example, when glass wool of about 50 cm is used, there is a problem in that the reflection of the sound source does not occur well. The advantage of using glass wool, which is about 20 cm, is that it can block unnecessary reflected sound. The density of glass wool can also affect the quality of spatial acoustics obtained. For example, there is an advantage in using glass wool having a density of 40k or more and 60k or less.

The thickness of the cork layer 1100 of the floor 1000 may be thinner than the thickness of the glass wool layers 1300 , 2200 , and 3200 of the floor 1000 , sidewall 2000 and/or ceiling 3000 .

According to one embodiment, the thickness of the cork layer 1100 may be selected from the range of 5T or more and 35T or less. According to an improved embodiment, the thickness of the cork layer 1100 may be selected from a range of 10T or more and 30T or less.

The thickness of the sand layer 1400 of the floor 1000 may be smaller than the thickness of the glass wool layers 1300 , 2200 , and 3200 of the floor 1000 , sidewall 2000 , and/or ceiling 3000 .

According to one embodiment, the thickness of the sand layer 1400 may be selected from a range of 10T or more and 80T or less. According to an improved embodiment, the thickness of the cork layer 1100 may be selected from a range of 30T or more and 60T or less.

Placing the cork and sand in the floor has the advantage of preventing unwanted reflections through the floor from being acquired.

The thickness of the cork layer 1100 of the floor 1000 may be smaller than the thickness of the sand layer 1400 of the floor 1000 .

The thickness of the plywood layer 1200 of the floor 1000 may be smaller than the thickness of the glass wool 1300 of the floor 1000 . The thickness of the plywood layer 1200 of the floor 1000 may be smaller than the thickness of the sand layer 1400 of the floor 1000 . The thickness of the plywood layer 1200 of the floor 1000 may be substantially the same as the thickness of the cork layer 1100 of the floor 1000 . The thickness of the plywood layer 1200 of the floor 1000 may be thicker than the thickness of the cork layer 1100 of the floor 1000 .

A gypsum board layer 2100 may be positioned on the glass wool layer 2200 . A wooden wool board layer 2300 may be positioned under the glass wool layer 2200 . The wood wool board layer 2300, the glass wool layer 2200, and the gypsum board layer 2100 may be sequentially stacked.

The thickness of the wood wool board layer 2300 of the side wall 2000 may be thinner than the thickness of the glass wool layers 1300 , 2200 , and 3200 of the floor 1000 , the side wall 2000 , and/or the ceiling 3000 .

According to one embodiment, the thickness of the wooden wool board layer 2300 may be selected from a range of 5T or more and 25T or less. According to the improved embodiment, the thickness of the wooden wool board layer 2300 may be selected from the range of 10T or more and 20T or less.

The thickness of the wood wool board layer 2300 of the side wall 2000 may be smaller than the thickness of the sand layer 1400 of the floor 1000 . The thickness of the wooden wool board layer 2300 of the side wall 2000 may be substantially the same as the thickness of the cork layer 1100 of the floor 1000 . The thickness of the wooden wool board layer 2300 of the side wall 2000 may be thicker than the thickness of the cork layer 1100 of the floor 1000 .

A gypsum board layer 3100 may be positioned on the glass wool layer 3200 . A wooden wool board layer 3300 may be positioned under the glass wool layer 3200 . The wood wool board layer 3300, the glass wool layer 3200, and the gypsum board layer 3100 may be sequentially stacked.

The thickness of the wood wool board layer 3300 of the ceiling 3000 may be thinner than the thickness of the glass wool layers 1300 , 2200 , and 3200 of the floor 1000 , sidewall 2000 , and/or ceiling 3000 .

According to one embodiment, the thickness of the wooden wool board layer 3300 may be selected from a range of 5T or more and 25T or less. According to the improved embodiment, the thickness of the wooden wool board layer 3300 may be selected from the range of 10T or more and 20T or less.

The thickness of the wood wool board layer 3300 of the ceiling 3000 may be smaller than the thickness of the sand layer 1400 of the floor 1000. The thickness of the wood wool board layer 3300 of the ceiling 3000 may be substantially the same as the thickness of the cork layer 1100 of the floor 1000 . The thickness of the wood wool board layer 3300 of the ceiling 3000 may be thicker than the thickness of the cork layer 1100 of the floor 1000 .

In the ceiling 3000 and/or the sidewall 2000, the gypsum board layers 2100 and 3100 are thin compared to the thickness of the glass wool layers 1300, 2200 and 3200 of the floor 1000, the sidewall 2000 and/or the ceiling 3000. ) may be included.

5 is a diagram for explaining characteristics of a BRIR according to an embodiment. 6 is a diagram for explaining a structure of a sound chamber for obtaining a BRIR according to an embodiment.

According to one embodiment of the present application, the class wool layers 1300, 2200, and 3200 are designed to have a thickness of 100T, the cork layer 1100 is designed to have a thickness of 13T, and the sand layer 1400 is designed to have a thickness of 50T. this can be provided.

BRIR can be obtained by installing one or more speakers outside the sidewall 2000 . In the sound room according to an embodiment of the present application, BRIR may be obtained by installing one or more speakers outside the ceiling 3000 .

According to one embodiment of the present application, 12 speakers may be arranged at regular intervals on the sidewall 2000, and a diffuser 4000 for increasing sound reflection may be arranged below the speakers. According to one embodiment of the present application, six speakers may be arranged at regular intervals on the ceiling 2000, and a microphone may be arranged below the center of the ceiling.

The diffuser 4000 may be disposed to be positioned at the level of a person's ear. The diffuser 4000 may be disposed to be positioned at ear level based on when a person is sitting. The diffuser 4000 may be disposed to be positioned at the level of the ear based on when a person is standing.

According to an embodiment of the present application, the diffuser 4000 having a first width is disposed at the level of the person's ears when sitting, and the diffuser 4000 has a second width at the height of the person's ears when standing. and the second width may be larger than the first width.

The angle of the diffuser 4000 may be changed for each predetermined length. According to one embodiment, the angle between the normal of the first diffuser 4000 and the normal of the second diffuser 4000 may be 90 degrees, and the first diffuser 4000 and the second diffuser 4000 are disposed adjacent to each other and two The length of the diffuser 4000 may be 1.2 m.

The diffuser 4000 may reduce the acquisition amount of 'initial reflection sound' by including perforated areas.

Since the angle or position of the diffuser 4000 has a great influence on the sound source, it must be designed in consideration of various factors.

Although FIG. 6 shows the diffuser 4000 on two side walls 2000 for simplicity, the diffuser 4000 may be installed on all side walls. For example, a first sidewall 2000', a second sidewall 2000'', a third sidewall 2000''', and a fourth sidewall 2000'''' are formed along the edge of the floor 1000. In this case, at least one diffuser 4000 is provided on the first sidewall 2000', the second sidewall 2000'', the third sidewall 2000''', and the fourth sidewall 2000''''. can be placed.

The diffuser 4000 formed on the first sidewall 2000' and the diffuser 4000 formed on the second sidewall 2000'' may be disposed at the same height. The diffuser 4000 formed on the second sidewall 2000'' and the diffuser 4000 formed on the third sidewall 2000''' may be disposed at the same height. The diffuser 4000 formed on the third sidewall 2000''' and the diffuser 4000 formed on the fourth sidewall 2000'''' may be disposed at the same height.

According to one embodiment of the present application, at least a part of the first sound output from the speaker installed outside the sidewall is reflected by the glass wool layer of the sidewall and inputted to a microphone placed at an arbitrary position in the sound chamber, At least a part of the second sound output from the speaker installed outside is reflected by the glass wool layer of the floor and is input to the microphone placed at an arbitrary position in the sound chamber, and the reflectance of the sidewall of the first sound is It may be greater than the reflectance of the floor of sound.

According to one embodiment of the present application, obtaining a first recording sound source through a first microphone installed in the left ear of a person in the sound chamber according to an impulse output through a first speaker installed outside the sidewall; obtaining a second recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the first speaker; Acquiring a BRIR set corresponding to the location of the first speaker based on the first recording sound source and the second recording sound source, wherein the BRIR set includes a first BRIR for the left ear and a second BRIR for the right ear. box-; obtaining a third recording sound source through the first microphone installed in the left ear of the person in the sound chamber according to an impulse output through a second speaker installed outside the ceiling; obtaining a fourth recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the second speaker; and obtaining a BRIR set corresponding to the position of the second speaker based on the third recording sound source and the fourth recording sound source.

The BRIR acquired in the acoustic room disclosed in this application may include direct sound and early reflection. As an example, the BRIR obtained in the sound room disclosed in this application may be obtained corresponding to a target area (TAR) including some frames of early reflections (ex., early reflections acquired within 10 ms) and direct sounds.

The BRIR obtained in the sound room disclosed in this application may be a sound source with improved positional accuracy. Specifically, BRIRs corresponding to impulses output from a speaker located on the sidewall 2000 among BRIR pairs obtained through a microphone may include a plurality of diffusely reflected sound sources. Among the BRIR pairs acquired through the microphone, a BRIR corresponding to an impulse output from a speaker located on the ceiling 3000 may include a small number of sound sources reflected from the floor. Among the BRIR pairs acquired through the microphone, the BRIR corresponding to the impulse output from the speaker located on the ceiling 3000 has a wide interval between early reflections, which is advantageous in acquiring the BRIR.

In this specification, the present applicant conducted experiments to explain the inventive idea based on the actual optimal material and its thickness, and described the content of the invention in detail. However, at least one material and / or thickness disclosed in this specification may be replaced or changed within a reasonable range, and this should also be regarded as disclosed in this specification as long as it includes the technical spirit of this specification.

For example, glass wool may be replaced with other materials composed of inorganic fibers. As a specific example, the glass wool layers 1300, 2200, and 3200 may be replaced with a rockwool layer. As another example, cork may be replaced with a heat insulating material. As a specific example, the cork layer 1100 may be replaced with wool or cellulose fiber.

7 is a diagram of an apparatus for generating a binaural transfer function according to an embodiment. Referring to FIG. 7 , the device 10 may include a communication unit 100 , a control unit 200 and an output unit 300 .

The device 10 may acquire information or data through wired or wireless communication through the communication unit 100 . For example, the apparatus 10 may obtain a concha binaural transfer function, an eardrum binaural transfer function, and the like through the communication unit 100 . The communication unit 100 may perform communication with various types of external devices according to various types of communication methods. The communication unit 100 may include a Wi-Fi chip, a Bluetooth chip, a wireless communication chip, and an NFC chip. The control unit 200 can communicate with various external devices using the communication unit 100 .

The operation performed by the device 10 may be performed by the controller 200 or by the controller 200 controlling other components of the device 10 .

The controller 200 may process and calculate various types of information within the device 10 . The control unit 200 may control other components constituting the device 10 .

The control unit 200 may be implemented as a computer or a similar device according to hardware, software, or a combination thereof. In terms of hardware, the control unit 200 may be one or a plurality of processors. Alternatively, the controller 200 may be provided as processors that are physically separated and collaborate through communication. Examples of the control unit 200 include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processor (DSP), a state machine, and an on-demand Semiconductors (Application Specific Integrated Circuits, ASICs), radio-frequency integrated circuits (Radio-Frequency Integrated Circuits, RFICs) may be used, but are not limited thereto. In terms of software, the control unit 200 may be provided in the form of a program or application that drives a hardware control unit.

The output unit 300 may output processing results of various types of information of the controller 200 and calculation results. An example of the output unit 300 is a display, but is not limited thereto.

The device 10 may further include an input unit. The device 10 may receive information or data from the outside through the input unit. For example, the input unit may include a microphone. In this case, the device 10 may obtain the binaural transfer function by recording the binaural transfer function through the microphone.

The device 10 may further include a storage unit. The storage unit stores data necessary for the operation of the device 10 or data generated during operation. The storage unit may be a storage medium for storing the data. The storage unit is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg SD or XD memory, etc.), RAM (random access memory (RAM), SRAM (static random access memory, SRAM), ROM (read only memory, ROM), EEPROM (electrically erasable programmable read only memory, EEPROM), PROM (programmable read only memory, PROM), magnetic It may be at least one of a memory, a magnetic disk, and an optical disk, but is not limited thereto.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computing means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

In the above, the present application has been described based on the examples, but the present application is not limited thereto, and it is clear to those skilled in the art that various changes or modifications can be made within the spirit and scope of the present application, and thus It should be noted that such changes or modifications fall within the scope of the appended claims.

1000: bottom
2000: sidewall
3000: ceiling

Claims (7)

In the sound room including a floor, side walls and a ceiling,
The inner wall of the ceiling containing a glass wool layer; an inner wall of the side wall including the glass wool layer; And an inner wall of the floor including the glass wool layer;
One or more speakers are installed outside the ceiling, and one or more speakers are installed outside the sidewall.
On the inner wall of the floor, a sand layer is disposed under the glass wool layer, a cork layer is disposed on the glass wool layer, and plywood is disposed between the glass wool layer and the cork layer,
At least a part of the first sound output from the speaker installed outside the sidewall is reflected by the glass wool layer of the sidewall and input to a microphone placed at an arbitrary position in the sound chamber;
At least a part of the second sound output from the speaker installed outside the ceiling is reflected by the glass wool layer of the floor and input to the microphone placed at an arbitrary position in the sound chamber,
The reflectance of the sidewall of the first sound is greater than the reflectance of the floor of the second sound,
sound box.
According to claim 1,
The thickness of the cork layer is thinner than the thickness of the glass wool layer.
According to claim 2,
The thickness of the sand layer is thinner than the thickness of the glass wool layer.
According to claim 3,
The thickness of the cork layer is thinner than the thickness of the sand layer.
According to claim 4,
The acoustic chamber of claim 1 , wherein the glass wool layer of the ceiling, the glass wool layer of the sidewall, and the glass wool layer of the floor have the same thickness.
According to claim 5,
The thickness of the glass wool layer is 100T or less,
The thickness of the cork layer is 20T or less,
The thickness of the sand layer is 50T or less, the sound chamber.
In the BRIR acquisition method performed in the acoustic chamber of claim 1,
obtaining a first recording sound source through a first microphone installed in the left ear of the person in the sound chamber according to an impulse output through a first speaker installed outside the sidewall;
obtaining a second recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the first speaker;
Acquiring a BRIR set corresponding to the location of the first speaker based on the first recording sound source and the second recording sound source, wherein the BRIR set includes a first BRIR for the left ear and a second BRIR for the right ear. box-;
obtaining a third recording sound source through the first microphone installed in the left ear of the person in the sound chamber according to an impulse output through a second speaker installed outside the ceiling;
obtaining a fourth recording sound source through the first microphone installed in the right ear of the person in the sound chamber according to the impulse output through the second speaker; and
Acquiring a BRIR set corresponding to the location of the second speaker based on the third recording sound source and the fourth recording sound source;
How to obtain BRIR.

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