JP7341755B2 - Acoustic reflector for local sound field support and local sound field support device - Google Patents

Description

The present invention relates to an acoustic reflector for local sound field support and a local sound field support device.

Conventionally, theaters and halls have been equipped with reverberation processing devices such as soundboards or acoustic reflectors. Offices, which have smaller spaces than theaters and the like, are equipped with walls, ceilings, partition boards, etc. that have sound-absorbing structures or materials.

For example, Patent Document 1 describes a method for effectively making the target sound easier to hear by making it difficult to hear only the noise sound even when a target sound exists in the same space in addition to noise sound in an office or living space. A sound environment control device is disclosed.

JP 2016-52049 Publication

In recent years, many open spaces and so-called "waigaya" environments have been established in stores, public spaces, and the like. In order to improve work efficiency and ensure good communication within each area, a sound environment is required that makes it easy to hear the target sound within each area. However, in open spaces, the purpose of use, sound source, and volume vary depending on the area and time. Therefore, with conventional technology that controls the sound environment of a target area by controlling noise sounds and sounds from other areas, it is difficult to secure a suitable sound environment for each area, or it takes time to secure a suitable sound environment. .

In view of the above-mentioned circumstances, local sound field support devices that actively support the sound field in each area are being considered. This local sound field support device collects sounds in an area, extracts target sounds such as conversational sounds that the user hears from the collected sounds, and emits emphasized sounds that emphasize the target sounds under predetermined conditions in the area. Output to. In such a local sound field support device, in order to make it easier for the user to hear the target sound in an area where there is noise surrounding the user, the emphasis sound output from the emphasis sound output device such as a speaker must be unobstructed and the user It is important to reach the However, depending on the relative positional relationship between the user and the speaker, the emphasized sound that reaches the user may become weaker, and the effect of making it easier for the user to hear the target sound may not be achieved sufficiently. Therefore, there has been a need for a mechanism that allows the emphasized sound to reach the user in a good manner.

The present invention provides an acoustic reflector for local sound field support and a local sound field support device that allows enhanced sound to reach a user in each area of an open space.

The acoustic reflector for local sound field support of the present invention collects sounds in an area in an open space, extracts a target sound, and outputs an emphasized sound that emphasizes the target sound under predetermined conditions from an emphasized sound output device. an acoustic reflector for local sound field support used in a local sound field support device that supports a sound field in the area by reflecting regularly the emphasized sound output from the emphasized sound output device; The reflecting surface has a bottom surface, and the reflective surface is arranged so that the user in the area is located on the path of the regularly reflected emphasized sound, and the reflective surface has a bottom surface and a linear shape as it goes from the outer periphery of the bottom surface toward the center. It is composed of a reflecting main body having a side surface that rises or descends, and the side surface serves as the reflecting surface .

According to the above-described acoustic reflector for local sound field support, the course of the emphasized sound output to the area within the open space is directed toward the user, so that the emphasized sound reaches the user in a good manner.

According to the above-described acoustic reflector for local sound field support, the acoustic reflector has a simple shape, and the emphasized sound output from the emphasized sound output device is reflected from the side surface and reaches the user well.

The acoustic reflector for local sound field support of the present invention may further include a reflective surface adjuster that adjusts the attitude of the reflective surface in accordance with the relative position of the emphasized sound output device and the user.

According to the above-mentioned acoustic reflector for local sound field support, even if the relative position between the emphasized sound output device and the user is changed, the attitude of the reflecting surface is adjusted according to the changed relative position, and the emphasized sound is Reach users better.

In the local sound field support acoustic reflector of the present invention, the reflective surface adjuster makes the reflective surface flush with an installation surface on which the local sound field support acoustic reflector is provided; Either or both of the above-mentioned reflecting surface may be rotated so that the angle formed with respect to the installation surface changes.

In the above-mentioned acoustic reflector for local sound field support, if the attitude of the reflecting surface is adjusted using the reflecting surface adjuster so that it is flush with the installation surface, the surface of the reflecting surface can be handled in the same way as the surface of the installation. Become. Furthermore, if the reflective surface can be rotated by the reflective surface adjuster, the acoustic reflector for local sound field support can be stored when not needed. For example, if the acoustic reflector for local sound field support is provided on the tabletop of a desk, the acoustic reflector for local sound field support can be accommodated inside the desk below the tabletop surface when it is not needed.

The local sound field support device of the present invention includes the above-described local sound field support acoustic reflector.
With the above-described configuration, the emitting direction of the emphasized sound outputted from the emphasized sound output device to the area within the open space is directed toward (the head of) the user, so that the emphasized sound can reach the user well.

In the local sound field support device of the present invention, a desk may be provided in the area, and the local sound field support acoustic reflector may be installed at the center of the tabletop of the desk in plan view.

According to the above-mentioned local sound field support device, when the emphasized sound is output from the emphasized sound output device placed above the desk toward the center of the desk in plan view, the emphasized sound is reflected by the reflective surface. , reach users better.

In the local sound field support device of the present invention, a desk may be provided in the area, and the local sound field support acoustic reflector may be installed in a space above the center of the desk in plan view.

According to the above-mentioned local sound field support device, when the emphasized sound is output from the emphasized sound output device placed above the desk toward the tabletop of the desk, the emphasized sound is emitted from the surface of the desk or other fixtures, etc. It is reflected from surfaces as well as reflective surfaces and reaches the user better.

The local sound field support device of the present invention further includes a user position estimator that estimates the position of the user within the area, and the attitude of the reflecting surface is adjusted according to the position estimated by the user position estimator. May be adjusted.

According to the above-described local sound field support device, even if the user moves or the number of users increases or decreases, the user position estimator estimates the user's position within the area, and the posture of the reflecting surface is adjusted according to the user's position. adjusted. This allows the emphasized sound to reach the user in a good manner.

According to the acoustic reflector for local sound field support and the local sound field support device of the present invention, a suitable sound environment can be provided in each area of an open space.

FIG. 2 is a plan view of an area of an open space in which an acoustic reflector for local sound field support and a local sound field support device according to the first embodiment of the present invention are provided. FIG. 2 is a side view of the area shown in FIG. 1 viewed from the X direction. FIG. 3 is a side view of the area shown in FIG. 2 viewed from the Y direction. FIG. 2 is a block diagram of the local sound field support device shown in FIG. 1. FIG. It is a side view of the area of the open space in which the acoustic reflector for local sound field support and the local sound field support device of 2nd Embodiment of this invention were provided.

Hereinafter, preferred embodiments of the acoustic reflector for local sound field support and the local sound field support device of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIGS. 1 and 2, a local sound field support device 10 according to a first embodiment of the present invention supports a local sound field in an open space 100 between a floor 202 and a ceiling 200 of a building. It is a device for The open space 100 has a plurality of areas 110 that are not horizontally partitioned by walls, partition plates, or the like. That is, a "local sound field" means a sound field in areas 110 that are part of the open space 100 and are spatially adjacent to each other when the open space 100 is taken as a whole. The open space 100 is a single space configured so that each area 110 can be used simultaneously for individual purposes such as meetings, individual work, and socializing.

In the open space 100 of this embodiment, each area 110 is provided with a desk 121 and a chair 122. In the area 110, at least one user 130 (see FIG. 3) can sit on a chair 122 and spend time according to the purpose of use. In FIGS. 1 and 2, the user 130 is omitted. For example, one area 111 among a plurality of areas 110 is illustrated in FIG. In the area 110, a plurality of users 130 are sitting around a desk 121 on chairs 122, communicating with each other and having a meeting.

One local sound field support device 10 is provided in each area 110. The local sound field support devices 10 in each area 110 have a mutually similar configuration.

The local sound field support device 10 includes a sound collector 20, an emphasis sound generator 55, an emphasis sound output device 60, an acoustic reflector (acoustic reflector for local sound field support) 1, and a user position estimator 85. There is.

The sound collector 20 is suspended from the ceiling 200 at the center of the area 111 in a plan view into the space above the area 111. The sound collector 20 has a cylindrical holder 24 and a plurality of sound collection microphones 22. As shown in FIG. 2, the sound collector 20 of this embodiment has eight sound collection microphones 22. The eight sound collection microphones 22 are arranged on the side surface of the holder 24 at equal intervals in the circumferential direction. Note that the user 130 is omitted in FIGS. 1 and 2.

The sound collection microphone 22 collects sounds in the area 111. The sound collection direction of the eight sound collection microphones 22 in the initial state is radially oriented toward the outside in the radial direction from the center of the holder 24 in a plan view. The type of sound collection microphone 22 is not particularly limited, but may be, for example, a commercially available sound collection microphone (product name: CSMIC-S1R0, vendor: System Infrontia Co., Ltd.).

The emphasized sound generator 55 collects the sounds of the area 111, extracts a target sound, and generates an emphasized sound that emphasizes the target sound under predetermined conditions. As shown in FIG. 2, the emphasis sound generator 55 is placed in the ceiling space 210. The sound control mechanism 70 is installed, for example, in a ceiling space 210 that overlaps the sound collector 20 in plan view.

The emphasized sound generator 55 is connected to the sound collector 20 and extracts a target sound included in the sound collected by the sound collector 20. The target sound means a sound that the user 130 hears in each area 110 depending on the purpose of use. The target sound of area 111 is the conversational sounds of all users 130 within area 111 . The emphasized sound generator 55 extracts the conversation voices of the plurality of users 130 from the sounds collected by the eight sound collection microphones 22 .

The emphasized sound generator 55 generates an emphasized sound by emphasizing the target sound extracted as described above. The emphasized sound refers to a sound that has been emphasized under predetermined conditions so that the target sound can be easily heard by the user 130. As a predetermined condition, for example, a frequency component of less than 2 kHz that contains many vowel components is deleted from the frequency component of the target sound, and a frequency component of 2 kHz or more that contains many consonant components is left, or a frequency component of 2 kHz or more is amplified. One method is to do so. Another condition for generating the emphasized sound from the target sound is, for example, when the user 130 sets the volume of the target sound to a predetermined volume [dB] based on a loudness curve with respect to the peak frequency of the target sound. One example is a method of amplifying the physical sound volume [dB] that can be felt. The emphasized sound generator 55 outputs the generated emphasized sound to the emphasized sound output device 60.

The emphasized sound output device 60 is connected to the emphasized sound generator 55. In the height direction, a plurality of emphasized sound output devices 60 are suspended from the ceiling 200 at the outer periphery of the area 111 into the space above the area 111. In the horizontal direction, the emphasis sound output device 60 is arranged in the center of the desk 121 (center in plan view) or in a space opposite to the vicinity of the center, with the chair 122 and the user 130 sitting on the chair 122 in between. There is.

The emphasized sound output device 60 has a speaker 62. As shown in FIG. 1, in this embodiment, six speakers 62, the same number as the chairs 122 in the area 111, are provided. As shown in FIGS. 1 and 3, the output surface 64 of the emphasized sound output device 60 is oriented so as to pass in front of the eyes of the user 130 sitting on the chair 122 and face the center of the desk 121.

Each of the six speakers 62 has directivity. The directivity of the speaker 62, that is, the direction in which the emphasized sound is output from the speaker 62, is generally directed toward the center of the desk 121. As shown in FIG. 3, the emphasized sound output device 60 outputs the emphasized sound 500 inputted from the emphasized sound generator 55 toward the area 111. The arrows in FIG. 3 indicate the course 502 of sound, which is a wave. The type of speaker 62 is not particularly limited, but may be, for example, a commercially available super-directional speaker (product name: PS-60E, vendor: Mitsubishi Electric Engineering Co., Ltd.).

The acoustic reflector 1 of the first embodiment is arranged at or near the center of the desk 121 in plan view. The acoustic reflector 1 has a reflecting surface 5 that specularly reflects the emphasized sound 500 output from the emphasized sound output device 60. The reflective surface 5 is arranged so that the head of the user 130 in the area 111 is located on the path 502 of the regularly reflected emphasized sound 500.

In the first embodiment, the acoustic reflector 1 includes a reflecting body 8 having a bottom surface 6 and a side surface 7 that rises linearly from the outer peripheral edge of the bottom surface 6 toward the center. The bottom surface 6 is a regular hexagon with the same number of corners as the number of chairs 122 in the area 111. In other words, the reflecting body 8 is a pyramid, and is composed of a regular hexagonal pyramid.

The side surface 7 is configured as a reflective surface 5. The side surface 7 is inclined at a predetermined angle with respect to the top surface 125 of the desk 121 (desk top installation surface). The predetermined angle is such that the emphasized sound 500 incident on the reflective surface 5 can directly reach the head of the user 130 after being regularly reflected. Since the bottom surface 6 is a regular hexagon as described above, the reflecting body 8 has the same number of side surfaces 7 as the number of chairs 122 in the area 111. In the circumferential direction of the bottom surface 6, one side surface 7 faces each chair 122 in the area 111 and the user 130 sitting on each chair 122.

The size and shape of the reflective surface 5 are determined based on the relative positions of the user 130 and the emphasized sound output device 60, for example, by numerical simulation using a geometric acoustic analysis method. The positions of the chair 122 and the user 130 in the area 111 and the materials of the emphasized sound output device 60 and the reflecting body 8 are not particularly limited as long as they have no sound absorption or very low sound absorption, and may be wood or resin, for example. preferable. Since the reflective surface 5 of the first embodiment is provided on the tabletop of the desk 121 and faces the user 130, the reflective main body 8 may be configured with a display that displays meeting materials.

The acoustic reflector 1 further includes a reflective surface adjuster 11. The reflective surface adjuster 11 adjusts the attitude of the reflective surface 5 in accordance with the relative position of the emphasized sound output device 60 and the user 130. In the first embodiment, the side surface 7 is movable and rotatable so that the angle formed by the side surface 7 forming the reflective surface 5 with respect to the upper surface 125 can be adjusted. The reflective surface adjuster 11 is configured to make the reflective surface 5 flush with the upper surface 125 (the installation surface on which the acoustic reflector for local sound field support is provided), and to adjust the angle between the reflective surface 5 and the upper surface 125. Rotate it so that it changes, or both. In the reflective surface adjuster 11 of the first embodiment, the reflective surface 5 can be made flush with the upper surface 125, and the reflective surface 5 can also be rotated as described above.

User position estimator 85 estimates the position of user 130 within area 111. For example, the user position estimator 85 is connected to the sound collector 20, the emphasized sound generator 55, and the reflective surface adjuster 11, and the user position estimator 85 is connected to the sound collector 20, the emphasized sound generator 55, and the reflective surface adjuster 11, and the The position of the user 130 within the area 111 is estimated based on information such as the conversation voice of the user 130 present, and the information on the position of the user 130 is output to the reflective surface adjuster 11. The reflective surface adjuster 11 adjusts the attitude of the reflective surface 5 in accordance with the position of the user 130 estimated by the user position estimator 85.

The reflective surface adjuster 11 and the user position estimator 85 are housed in the sound control mechanism 70. The sound control mechanism 70 is composed of, for example, a computer. The emphasized sound generator 55 is configured with a program that generates emphasized sound by emphasizing the target sound included in the sound collected by the sound collector 20 as described above, and is built in the computer described above. The reflective surface adjuster 11 is configured with a program that adjusts the attitude of the reflective surface 5 according to the relative position of the emphasized sound output device 60 and the user 130 as described above, and is built in the computer described above. The user position estimator 85 is configured with a program for estimating the position of the user 130 within the area 111 as described above, and is built in the computer described above.

In addition to the emphasis sound generator 55, the reflective surface adjuster 11, and the user position estimator 85, the sound control mechanism 70 includes a sound collector adjuster that controls the directivity of the sound collection microphone 22, and an emergency state controller when an emergency situation occurs. Contains various regulators and controllers that generate emphasized sounds to notify the occurrence of occurrences. That is, the sound control mechanism 70 functions as a control mechanism that comprehensively controls the operation of the local sound field support device 10.

Next, an example of the flow of sound field support in the area 111 by the local sound field support device 10 will be described. When a conversation between users 130 starts in area 111, sound collector 20 collects sounds within area 111. The collected sound is transmitted from the sound collector 20 to the emphasized sound generator 55.

The emphasized sound generator 55 extracts the conversational sound, which is the target sound of the area 111, from the input sound, emphasizes the conversational sound, and generates the emphasized sound 500. The emphasized sound 500 is transmitted from the emphasized sound generator 55 to the emphasized sound output device 60. The emphasized sound output device 60 outputs the emphasized sound inputted from the emphasized sound generator 55 toward the reflective surface 5 of the acoustic reflector 1 .

As shown in FIG. 4, the sound within the area 111 that is collected by the sound collector 20 is also transmitted from the sound collector 20 to the user position estimator 85. The user position estimator 85 determines the position in the area 111 based on the input information on the sound components in the area 111, the information on the time when the sound in the area 111 is captured, which is known by the sound control mechanism 70, etc. Estimate the location of the user 130. The positional information of the user 130 in the area 111 includes, for example, information on which of the six chairs 122 shown in FIG. are widely included.

The position of the user 130 estimated by the user position estimator 85 is output to the reflective surface adjuster 11. The reflective surface adjuster 11 adjusts the angle of the reflective surface 5 with respect to the upper surface 125 and the attitude of the reflective surface 5 with respect to the user 130 in accordance with the input position information of the user 130 .

Through the above-described flow, the sound field in the area 111 is supported so that the user 130 can easily hear the target sound. That is, in the area 111, the user 130 hears both the real conversation voice with the user 130 in the same area 111 and the emphasized conversation voice coming from behind and above.

In each area 110 in the open space 100 other than the area 111, the sound field is supported in the same manner as described above. The emphasis sound generator 55 of each area 110 emphasizes the target sound suitable for the purpose of use of each area 110, and generates the emphasis sound 500 suitable for the purpose of use of each area 110. For example, when the area 110 is used for a break by the user 130, relaxing music may be output from the emphasis sound generator 55 and the sound in the area 110 including the music may be collected by the sound collector 20. good. In that case, the target sound may be music that has a relaxing effect, and the emphasized sound 500 may be heavy bass music that amplifies the bass part of this music.

The acoustic reflector 1 of the first embodiment described above has a reflecting surface 5 that specularly reflects the emphasized sound 500 output from the emphasized sound output device 60. The reflective surface 5 is arranged so that the user 130 in each area 110 where the acoustic reflector 1 is provided is located on the path of the regularly reflected emphasized sound 500. According to the acoustic reflector 1, the course of the emphasized sound 500 output to each area 110 can be directed toward (the head of) the user, and the emphasized sound 500 can be made to reach the user favorably.

The acoustic reflector 1 of the first embodiment includes a reflecting body 8 having the bottom surface 6 and side surfaces 7 described above. The side surface 7 is configured as a reflective surface 5 of the acoustic reflector 1 . According to the acoustic reflector 1 configured in this way, the acoustic reflector 1 has a simple shape, and the emphasized sound 500 outputted from the emphasized sound output device 60 is reflected on the side surface 7, so that the user 130 can enjoy the sound reflector 1. can be reached.

The acoustic reflector 1 of the first embodiment further includes a reflective surface adjuster 11 that adjusts the attitude of the reflective surface 5 in accordance with the relative position of the emphasized sound output device 60 and the user 130. According to the acoustic reflector 1 configured in this way, even if the relative position between the emphasized sound output device 60 and the user 130 is changed, the attitude of the reflecting surface 5 is adjusted according to the changed relative position, and the position of the reflecting surface 5 is continuously adjusted. The emphasized sound 500 can be successfully delivered to the user 130.

In the acoustic reflector 1 of the first embodiment, the reflective surface adjuster 11 is configured to make the reflective surface 5 flush with the top surface 125 of the desk 121, and to change the angle between the reflective surface 5 and the top surface 125. It can be rotated. According to the acoustic reflector 1 configured in this manner, when not in use, the reflective surface 5 is adjusted to be flush with the upper surface 125 by the reflective surface adjuster 11, and the top of the reflective surface 5 can be used as a tabletop area. Further, when the acoustic reflector 1 is not in use, the reflective surface 5 is rotated by the reflective surface adjuster 11, and the acoustic reflector 1 can be stored in the desk 121 below the top surface 125.

The local sound field support device 10 of the first embodiment described above directs the path of the emphasized sound 500 output from the emphasized sound output device 60 to each area 110 toward the user by including the above-described acoustic reflector 1. Therefore, compared to a local sound field support device that does not include the acoustic reflector 1, the emphasized sound 500 can reach the user 130 better. As a result, the local sound field support device 10 emphatically delivers the target sound suitable for the purpose of use of the area 110 in which the user 130 is located, even when there is noise etc. in the surrounding area 110, and delivers active and It can effectively support the sound field. Thereby, the local sound field support device 10 can provide a more suitable sound environment to each area 110 in the open space 100 according to the purpose of use than the conventional local sound field support device.

In the local sound field support device 10 of the first embodiment, a desk 121 is provided in the area 111, and the acoustic reflector 1 is installed at the center of the top surface (tabletop) 125 of the desk 121 in plan view. According to the local sound field support device 10 configured in this way, when the emphasized sound 500 is output from the emphasized sound output device 60 placed above the desk 121 toward the center of the top surface 125 in plan view, the As shown in FIG. 3, the emphasized sound 500 can be reflected by the reflecting surface 5 and can reach the user 130 well and directly.

The local sound field support device 10 of the first embodiment further includes a user position estimator 85. The attitude of the reflective surface 5 is adjusted according to the position of the user 130 estimated by the user position estimator 85. According to the local sound field support device 10 configured in this way, even if the user 130 moves within the area 110 or the number of users 130 increases or decreases, the user position estimator 85 can determine the position of the user 130 within the area 110. By estimating this, the attitude of the reflective surface 5 can be adjusted according to the position of the user 130. This allows the emphasized sound 500 to reach the user 130 in a good manner.

(Second embodiment)
Next, an acoustic reflector and a local sound field support device according to a second embodiment of the present invention will be described. Below, each component of the acoustic reflector and local sound field support device of the second embodiment that are common to the acoustic reflector 1 and the local sound field support device 10 of the first embodiment will be explained as follows. The same reference numerals are given, and the explanation thereof will be omitted.

As shown in FIG. 5, the local sound field support device 12 of the second embodiment is the local sound field support device 10 of the first embodiment in which the acoustic reflector 1 is replaced with an acoustic reflector 2. The acoustic reflector 2 is suspended from the ceiling 200 and is installed in a space above the center of the desk 121 in plan view.

The acoustic reflector 2 has the same configuration as the acoustic reflector 1. However, the reflecting body 8 of the acoustic reflector 2 has a bottom surface 6 and a side surface 7 that descends linearly from the outer peripheral edge of the bottom surface 6 toward the center. The separation height between the bottom surface 6 and the ceiling 200 and the angle that the side surface 7 makes with respect to the bottom surface 6 and the top surface 125 of the desk 121 are such that the emphasized sound 500 reaches the head of the user 130 after being regularly reflected on the reflective surface. It's at an angle where you can do it. However, in the second embodiment, the emphasized sound 500 output from the emphasized sound output device 60 does not directly enter the reflecting surface 5, but instead enters the reflecting surface 5 after being specularly reflected by the upper surface 125.

Since the reflective surface 5 of the second embodiment is provided in a space above the center of the desk 121 in plan view and faces the user 130, the reflective main body 8 is composed of the lighting equipment and decorations in the area 111. Good too.

The flow of sound field support for the area 111 by the local sound field support device 12 is similar to the flow of sound field support for the area 111 by the local sound field support device 10.

The acoustic reflector 2 of the second embodiment described above includes a reflecting surface 5 and a reflecting body 8 that regularly reflect the emphasized sound 500 output from the emphasized sound output device 60, similarly to the first embodiment. Therefore, according to the acoustic reflector 2 of the second embodiment, the same effects as the acoustic reflector 1 of the first embodiment can be obtained.

The local sound field support device 12 of the second embodiment includes the acoustic reflector 2 described above. According to the local sound field support device 12 of the second embodiment, the same effects as the local sound field support device 10 of the first embodiment can be obtained.

Further, in the local sound field support device 12 of the second embodiment, a desk 121 is provided in the area 111, and the acoustic reflector 2 is installed in a space above the center of the desk 121 in plan view. According to the local sound field support device 12 configured in this way, the emphasized sound 500 that is output from the emphasized sound output device 60 arranged above the desk 121 toward the upper surface 125 and then regularly reflected on the upper surface 125 can reach the user 130 well. Further, since the acoustic reflector 2 is arranged above the upper surface 125, the space for utilizing the upper surface 125 can be expanded.

Although preferred embodiments of the present invention have been described in detail above, the present invention is not limited to specific embodiments. The present invention can be modified within the scope of the invention as defined in the claims.

For example, the shape of the acoustic reflector of the present invention is not limited to the pyramidal shape illustrated in each embodiment. The acoustic reflector of the present invention may have any shape as long as it can position the user 130 in the area 110 on the path of the emphasized sound 500 specularly reflected by the reflecting surface 5.

The configuration of the sound collector 20 is not limited to the configuration in which the eight sound pickup microphones 22 are arranged at equal intervals on the side surface of the holder 24 as described above. The sound collector 20 may include one or more sound collection microphones whose directivity can be changed as appropriate in response to a control signal from the sound control mechanism.

Furthermore, the configuration of area 110 is not limited to the configuration in which desk 121 and chair 122 are provided. The area 110 may be provided with only a desk 121, only a chair 122, other fixtures, etc., or not be provided at all.

1, 2 Acoustic reflector 5 for local sound field support Reflection surface 6 Bottom surface 7 Side surface 8 Reflection body 10, 12 Local sound field support device 11 Reflection surface adjuster 60 Emphasis sound output device 85 User position estimator 100 Open space 110 , 111 Area 121 Desk 125 Top surface (installation surface where acoustic reflector for local sound field support is provided)
130 User 500 Emphasized sound 502 Course

Claims (8)

Local sound that supports the sound field of the area by collecting sounds in an area in an open space, extracting a target sound, and outputting an emphasized sound that emphasizes the target sound under predetermined conditions from an emphasized sound output device. An acoustic reflector for local sound field support used in a field support device,
having a reflective surface that specularly reflects the emphasized sound output from the emphasized sound output device,
The reflective surface is arranged so that a user in the area is located on the path of the regularly reflected emphasized sound,
Consisting of a reflective main body having a bottom surface and side surfaces that linearly rise or fall from the outer periphery of the bottom surface toward the center,
the side surface is configured as the reflective surface ;
Acoustic reflector for local sound field support. further comprising a reflective surface adjuster that adjusts the attitude of the reflective surface according to the relative position of the emphasized sound output device and the user;
The acoustic reflector for local sound field support according to claim 1 . The reflective surface adjuster makes the reflective surface flush with the installation surface on which the local sound field supporting acoustic reflector is provided, and changes the angle that the reflective surface makes with respect to the installation surface. Rotate it in such a way, or do one or both of the following:
The acoustic reflector for local sound field support according to claim 2 . comprising the acoustic reflector for local sound field support according to any one of claims 1 to 3 ;
Local sound field support device. A desk is provided in the area,
The local sound field supporting acoustic reflector is installed at the center of the tabletop of the desk in plan view.
The local sound field support device according to claim 4 . A desk is provided in the area,
the local sound field supporting acoustic reflector is installed in a space above the center of the desk in plan view;
The local sound field support device according to claim 4 . further comprising a user position estimator that estimates the position of the user within the area;
the attitude of the reflecting surface is adjusted according to the position estimated by the user position estimator;
A local sound field support device according to any one of claims 4 to 6 . Local sound that supports the sound field of the area by collecting sounds in an area in an open space, extracting a target sound, and outputting an emphasized sound that emphasizes the target sound under predetermined conditions from an emphasized sound output device. The field support device includes a reflecting surface that specularly reflects the emphasized sound output from the emphasized sound output device, and the reflecting surface is located in the area on the path of the specularly reflected emphasized sound. comprising an acoustic reflector for local sound field support arranged such that the user is located;
further comprising a user position estimator that estimates the position of the user within the area;
the attitude of the reflecting surface is adjusted according to the position estimated by the user position estimator;
Local sound field support device.

Images