JP5409709B2 - Concert box - Google Patents

Description

  The present invention relates to an audio device that can easily obtain and enjoy an acoustic effect like a concert hall even in a small-scale house such as a home.

  With the opening of Osaka The Symphony Hall in 1982 and the subsequent Tokyo Suntory Hall, numerous concert halls dedicated to classical music were born throughout the past 20 years.

  The goal of acoustic design for halls and theaters is to achieve quietness and good sound, but the most severe performance is required for concert halls.

  The sound field of a room, including a concert hall, is characterized by the presence of reflected sound. Almost no reflected sound is outdoors, but sound is reflected from walls, floors, or ceilings indoors. ), Not only the direct sound (direct sound) but also the reflected sound.

  Therefore, even sounds from the same sound source cannot be heard in the same way indoors and outdoors. The way you hear the sound in the room varies greatly depending on how much the reflected sound returns.

  As a result of many reflected sounds returning one after another, “reverberation” is formed. If there is reverberation, even after the sound source stops and the sound stops, the sound remains and you can hear it. Reverberation is the most prominent feature of a room sound field, and the way it is heard varies greatly depending on the characteristics and quality of the reverberation.

  By the way, in a listening room or the like, a technique for reproducing a sound field in a completely different space such as a concert hall is called a sound field creation technique or a sound field reproduction technique. There are a multi-channel playback system using a plurality of speakers installed around the headphone system, a headphone system that plays back sound processed based on the head-related transfer function using headphones, and the like.

The following patent document is one of them, and the sound field creation device includes one or more speakers that output sound from a sound source, a reflected sound generation unit that generates reflected sound based on the sound from the sound source, and reflected sound. The open headphones that output the reflected sound from the generator and the reflected sounds that are output from the open headphones are output from the open headphones so that they reach the listener's ear with a delay from the sound output from the speakers. A signal processing unit that delays the reflected sound.
JP 2010-193105 A

  In this patent document 1, in comparison with the case of using normal headphones, it is possible to eliminate in-head localization and unnatural localization by using open headphones.

In addition to this, the following Patent Document 2 is capable of freely reproducing a reflected sound of an arbitrary angle expected using a virtual speaker and enabling sound field reproduction with a high sense of presence. In a sound field reproduction system that reproduces a sound field by arranging real speakers, a reflected sound for real speakers is generated and output to the real speakers based on each acoustic signal input to the plurality of real speakers A reflected sound generation unit for the real speaker, a reflected sound generation unit for the virtual speaker that generates a reflected sound for the virtual speaker based on each acoustic signal input to the plurality of real speakers, and the reflected sound for the virtual speaker A virtual speaker three-dimensional processing unit that inputs a reflected sound for the virtual speaker generated by the generation unit and performs three-dimensional processing and then outputs the reflected sound to the real speaker; The three-dimensional processing of the three-dimensional processing section for over a sound field reproduction system is characterized in that so as to reproduce the reflected sound by setting the virtual speakers arrival position of reflections.
JP 2001-16698 A

Further, Patent Document 3 provides a reverberation sound generator that can follow a movement of a sound source or a listening position in real time, and adds a sound incident on a virtual reflection wall regardless of the incident direction, A first calculation for transmitting sound radiated from one or a plurality of sound sources to a plurality of virtual reflection walls, which includes distributing the power of the reflected sound according to the direction and the reflection direction of the reflection wall. Means for adding incident sounds incident on the virtual reflection wall to each other, and adding the reflected sound reflected from the virtual reflection wall to the reflected sound according to a reflection direction, Second computing means for transmitting to at least one virtual reflecting wall, and the reflected sound reflected from the virtual reflecting wall is transmitted to one or a plurality of listening positions with the reflected sound weighted in the reflecting direction. Third operation A reverberation sound generating apparatus characterized by comprising a stage.
JP 7-49694 A

  As described above, in a listening room or the like, a sound field creation technique or a sound field reproduction technique for reproducing a sound field in a completely different space such as a concert hall is used by electrically controlling a plurality of speakers in a concert hall or the like. Most of them get close reflected sound.

  The object of the present invention is different from that of the conventional example, and the sound of the concert hall is a sound obtained by synthesizing a direct sound from the performer and a reverberant sound with a slight delay from the wall, ceiling, and floor, To provide a concert box that is an audio device that can reproduce the same effect as if it were in a concert hall, and can reproduce the same thing as much as possible in a narrow space without relying only on electrical control. It is in.

In order to achieve the above object, the present invention according to claim 1 is a box which can be installed in a building room with the listener's side as the front, the front of the box is formed as an opening surface, and two types of materials on the left and right side walls. Install the two speakers that make up the stereo unit in the box facing the front, and install the speakers for creating the reflected sound on the reflecting wall inside the box facing each material. The direction in which the reflected sound returns from the reflecting wall is set to the listener side, and the speaker is controlled so that there is a time difference between the sound from the two speakers constituting the stereo unit and the sound for creating the reflected sound. The gist is to install a device and change the ratio of synthesized sound of different materials by adjusting the volume of the speaker.

  According to the first aspect of the present invention, the box having at least the back side wall portion, the left and right wall portions, and the ceiling portion is open to the front side and is on the listener side. The listener then turns to the front of the box. In the box, two speakers constituting the stereo unit are installed facing the front opening, and the sound from here reaches the listener as a stereo. In the box, two speakers for creating reflected sound are installed on the left and right sides toward the back side wall, and the sound from these speakers returns as reflected sound on the back side wall and reaches the listener.

  In this way, the sound from the two speakers that make up the stereo unit is a direct sound similar to the sound from the concert hall performer, and the reflected sound at the back side wall has a slight delay. It is synthesized and the sound effect like a concert hall can be reproduced as much as possible in a narrow space.

  Furthermore, by using two types of materials for the reflection wall on the back side wall, two types of reflected sounds can be created, and furthermore, the user's favorite sound can be selected by adjusting the volume of the speaker. In addition, the same reflected sound can be heard with the material used in the actual hall, and it can be brought close to the sound of the favorite hall by changing the material type and the ratio of synthesis. You can also choose your favorite sound. (Wood, stone, plaster wall, painting, etc.)

  The gist of the present invention described in claim 2 is that the two kinds of materials of the reflecting wall are wood and stone.

  According to the second aspect of the present invention, the reflected sound of the stone is rather powerful and sharp, and the reflected sound of the tree is gentle and beautiful. Combining them brings out the best parts of each.

  As described above, the concert box of the present invention is an acoustic device that can easily obtain an acoustic effect as if in a concert hall, and the sound of the concert hall includes the direct sound from the performer and the walls, ceiling, floor. This is a synthesized sound of reverberant sound with a slight delay from the above, and the same thing can be reproduced as much as possible in a narrow space without relying only on electrical control.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view showing an embodiment of a concert box according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is a cross-sectional plan view of the same, and FIG.

  In FIG. 1, reference numeral 1 denotes a rectangular box having a front surface formed on an opening surface 2 that can be installed in a building room, and has at least a back side wall part 3, a left wall part 4, a right wall part 5, and a ceiling part 6. The front surface that is the opening surface 2 is the listener side.

  In the example shown in the figure, a floor 7 is provided as a cabinet type, an equipment storage space 8 is formed below the floor 7, and casters 9 are provided at the lowermost part so that the whole can be moved.

  In addition, such arrangement | positioning of the floor 7 and installation of the apparatus storage space 8 are not inevitable, and various variations can be selected suitably.

  In this embodiment, the floor 7 is a gradient floor. Make sure that the same reflected sound can be heard with the materials used in the actual hall, such as pine, firewood, and firewood. In the actual hall, the floor is flat, but the reflected sound from the floor is also utilized by making the floor slope so that the sound comes from the same angle as the front row of the 2nd floor seat where the listener's position is best heard.

  A reflection wall 10 is provided on the back side wall portion 3, and two types of materials are arranged on the left and right of the reflection wall 10. The illustrated example is composed of wood 11 and stone 12. These are inclined left and right so that the ends of the box 1 face the back side with the center of the box 1 as the boundary of joining. The wood 11 and the stone 12 are plate-like, and the wood 11 can be a natural material such as pine, agate, or cocoon, and the stone 12 can be a marble, granite, or Oya stone.

  The same reflected sound can be heard by using the material used in the actual hall for the reflecting wall 10 as well. For example, the reflected sound of the stone by the stone material 12 is rather strong and sharp, and the reflected sound of the tree by the wood 11 is gentle and beautiful. Combining them brings out the best parts of each.

  Note that the reflecting wall 10 can be brought close to the sound of a favorite hole by changing the type of material and the ratio of synthesis. You can also choose your favorite sound. In addition to the wood 11 and the stone 12, other materials such as a plaster wall / painting can be selected.

  The selection of the reflection wall includes selection of the material, selection of the size, and selection of the volume ratio described later, and it is preferable to decide by listening to which reflection wall sound is preferred.

  There are cases of single sounds and two types of composite sounds. A single note of your choice may be used, but if you make a double note, you will feel that both good points are added. A composite sound with two different ratios is recommended, but try to find the ratio you like most.

  A ceiling reflecting wall 13 is provided on the ceiling 6. This will also allow the same reflected sound to be heard with the material used in the actual hall. The material of the ceiling reflecting wall 13 can be selected from paint, plaster, acrylic board, wood, and the like, and it is preferable to make the sound a little soft by forming a void. In particular, an acrylic plate has the advantage of allowing light to pass through and is easy to use for lighting or the like, but it is preferable to use a porous plate because of its strong reflection. Reflective sound from the ceiling is necessary but should not be too strong.

  In the example shown in the figure, the ceiling reflecting wall 13 is curved in a convex shape, and two stages of curvature (the curvature is the same at 400R) are combined so that the reflected sound can reach from a plurality of surfaces.

  In the figure, reference numerals 14 and 15 denote two speakers constituting the stereo unit. The front side of the box 1 is the listener side, and these speakers 14 and 15 are installed in the box 1 facing the front.

  In addition, two speakers 16 and 17 for creating reflected sound were installed toward the reflecting wall 10 inside the box 1, and the direction in which the reflected sound returned from the reflecting wall 10 was set as the listener side. The speakers 16 and 17 are directed to each material of the reflecting wall 10, the wood 11 and the stone 12.

  The speakers 14 to 17 are small so as not to disturb the reflected sound in the box 1 as much as possible.

  The speakers 16 and 17 are provided with a tweeter reflector 18 made of an acrylic plate. The actual violin and viola high music instruments have a strong sound directivity to the top, but the tweeter reflector 18 guides the treble of the reflected sound toward the ceiling, and the tweeter has an upward reflector. This is closer to the actual sound.

  Although illustration is omitted, as a control of the speakers 14 to 17, a delay device for connecting the sound from the speakers 14 and 15 and the sound from the speakers 16 and 17 with a time difference is connected. A commercially available one can be used as this delay device, but it is installed in the device storage space 8 together with an amplifier device.

  The delay device is used to adjust the time difference between the main speaker (cluster speaker) in the hall and a plurality of auxiliary speakers for passenger seats to facilitate listening. In addition, it is often used as a function of a device (effector) that creates the processed sound of an instrument using an amplifier such as a guitar.

  In the present invention, the delay device is used to create a reflected sound similar to the reflected sound returning from the wall or ceiling of the concert hall in the box 1. In the actual hall, the walls and ceiling are separated from the players. Therefore, the reflected sound is delayed by 30-50 milliseconds depending on the size of the hall. (Time for the distance that the sound has detoured)

  Next, the usage will be described. In the box 1, two speakers 14 and 15 facing in the same manner as in a normal stereo unit are arranged, so that the sound can be directly heard as a stereo.

  The speakers 16 and 17 that produce the reflected sound are directed to each material of the reflecting wall 10, the wood 11 and the stone 12, and the sound from the speakers 16 and 17 is each material of the reflecting wall 10, the wood 11 and the stone 12. However, the delayed sound was sent to the rear-facing speakers (speakers 16 and 17) as reflected sound from the wall or ceiling. By adding the sound to the general L and R stereo sound from the speakers 14 and 15, it can be heard as a sound having a depth similar to an actual hall.

  It should be noted that each material of the reflecting wall 10 and the area ratio of the wood 11 and the stone 12 can be changed, but the ratio of the synthesized sound of different materials can be changed by adjusting the volume of the speakers 16 and 17.

Here, the determination of the specification of the reflecting wall 10 will be described.
(A) When changing the quality of the reflected sound, (1) When the sound source of the reflected sound combines R and L and send the same to the left and right speakers, (2) The left and right reflection walls There are cases where it is created with two kinds of favorite walls, both of which can be easily changed to a ratio suitable for the music at a volume ratio with respect to the two kinds of walls.

(B) When emphasizing the image position of the sound, (1) Even when the reflected sound is sent to R and L, and (2) The two types of walls on the left and right reflecting walls are made to sound as desired. (1), as mentioned above, I will try to find the composite sound with two different ratios, the ratio of my favorite. It is possible to match. For example, (2) is created symmetrically by using, for example, one sheet as a center and 2/3 as a tree and the outside 1/3 as a stone.

  Moreover, in the said embodiment, although the reflective wall 10 was provided in the back side wall part 3, when there is a space in a studio etc., a listener enters in the box 1 and the reflective wall 10 is provided in the back side of a listener. It is also possible.

It is a front view which shows embodiment of the concert box of this invention. It is the sectional view on the AA line of FIG. It is a cross-sectional top view of the concert box of this invention. It is a bottom view of the concert box of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Box 2 ... Opening surface 3 ... Back side wall part 4 ... Left wall part 5 ... Right wall part 6 ... Ceiling part 7 ... Floor 8 ... Equipment storage space 9 ... Caster 10 ... Reflective wall 11 ... Wood 12 ... Stone material 13 ... Ceiling Reflective wall 14-17 ... Speaker 18 ... Tweeter reflector

Claims (2)

This is a box that can be installed in the building room with the listener's side as the front. The front of the box is formed as an opening surface, and the rear wall is provided with reflective walls with two types of materials on the left and right. Speakers are placed in the box facing the front, speakers for creating reflected sound are placed on the reflective wall inside the box facing each material, and the direction in which the reflected sound returns from the reflective wall is the listener's side,
In addition, as a control of the speaker, a delay device is installed that gives a time difference between the sound from the two speakers constituting the stereo unit and the sound from the speaker for creating the reflected sound ,
Concert box characterized by changing the ratio of synthesized sound of different materials by adjusting the volume of the speaker.   2. The concert box according to claim 1, wherein the two types of material of the reflecting wall are wood and stone.

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