JPH04290400A - Speaker - Google Patents

Abstract

PURPOSE:To attain visual improvement and to obtain proper souund field and presence feeling. CONSTITUTION:Respective sub-speaker groupd 6 and 7 are embedded in a wall 1 so as to be the level of surface of an opening edge of a frame 9 of each speaker unit 8 equal to that of the wall 1. Accordingly, the wall 1 can be regarded as almost infinite buffle and the apparent powerful sound souce can be constructed by plural identical function speakers so that the diffraction phenomena of soundwave can be prevented and the wave surface which can be regarded as almost plane wave can be obtained. The embedding in the wall 1 results in improving the defect of visual distribution of speakers 6 and 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device that enhances the surround effect.

0002

2. Description of the Related Art Usually, a stereo recording recorded in a sound field contains a considerable amount of information about the sound field. This exists as a component with relatively little correlation between the L and R channels, and can be extracted by a simple matrix circuit such as L-R and R-L. In addition, by shifting the phase between both channels, or by reversing or shifting the phase only in bands that are particularly effective as a result of psychoacoustic analysis, it is possible to create a channel that is separate from the main channel. The signal is supplied to sub-speakers to obtain a surround effect.

[0003] In addition, in the presence stereo system, in addition to the main speaker, there is a sub-speaker installed approximately diagonally in front of the listener at an angle such that the sound does not directly reach the listener. It supplies a signal with a time delay of ms to several tens of ms, and is intended to diffuse the sound radiated from this sub-speaker by reflecting it off the walls of the room. As a result, a sense of presence and a sound field can be obtained as if by adding the primary reflected sound from the walls of an actual concert hall.

Furthermore, in a method using a DSP (digital sound processor), complex reflected sounds and reverberations in actual concert halls, churches, theaters, etc.
The idea was to record sound using a point pickup method or the like, store these patterns in a ROM through digital signal processing, and reproduce this sound field sensation component through a sub-speaker in the listening room.

FIG. 8 shows an example of the arrangement of surround speakers, in which a main speaker 2 for the L channel and a main speaker 3 for the R channel are arranged in a corner of a room surrounded by a wall 1. ing. There is an L on the ceiling or wall in the corner of the room facing each main speaker 2, 3.
A sub-speaker 4 for the channel and a sub-speaker 5 for the R channel are hung or directly fixed. Then, when reproduced sound is output from the main speakers 1 and 2, in addition to this reproduced sound, sub-reproduced sound that is information on the sound field feeling is outputted from the sub-speakers 4 and 5.

[0006]

However, in the conventional speaker device described above, when the listening position is set close to each of the sub-speakers 4 and 5, the existence of these sub-speakers 4 and 5 becomes noticeable. This is because it is easy to see that the sound source is located at the center point of the spherical wave (that is, due to the directivity of the speaker).

[0007] Therefore, in this way, the sub-speakers 4,
If there is a sense of presence in the sound field 5, faithful reproduction of sound field information will be incomplete, resulting in a problem in that the surround effect will be reduced. Furthermore, since the wavefront of sound emitted from a speaker is generally considered to be close to a spherical surface, if the listening position shifts slightly, the position of the sound image will change critically. For this reason, as can be seen from FIG. 8, the sound image formed by combining the sound waves from each sub-speaker 4 and 5 changes due to a slight shift in the listening position, giving an unnatural feel in surround playback. There is also the problem.

Furthermore, as mentioned above, each sub-speaker 4
, 5 is assumed to be close to a spherical surface, the center of the wave surface becomes the sound source, and even if a delay is applied to these sub-speakers 4 and 5, it is expected that the effect of giving depth to the sound source will be expected. The problem is that it is impossible. Furthermore, as described above, each of the sub-speakers 4 and 5 is suspended from the ceiling or fixed to the wall, so there is a problem that they become a visual nuisance.

The present invention has been made in response to the above-mentioned circumstances, and an object of the present invention is to provide a speaker device that can improve visual appearance and provide an appropriate sense of sound field and sense of presence. shall be.

0010

[Means for Solving the Problems] According to the invention as set forth in claim 1, in a speaker device having a plurality of speaker units for reproducing sound field information arranged at substantially equal intervals vertically and horizontally, The main body of the speaker device is characterized in that the main body of the speaker device is embedded or enclosed in the wall or partition such that the acoustic radiation surfaces of the plurality of sub-speaker units are flush with the wall or partition.

[0011] The invention according to claim 2 is characterized in that a delay means is provided for applying the same or different delays to each of the plurality of vertical columns of the plurality of speaker units. In the invention according to claim 3, the plurality of speaker units are of a small-diameter full-range or coaxial type, and have substantially the same characteristics.

0012

In the first aspect of the invention, the main body of the speaker device is embedded or enclosed in a wall or partition. When burying or enclosing the speaker units, the acoustic radiation surfaces of the plurality of speaker units were made to be substantially flush with the wall surface or partition surface. Therefore, the wall or partition can be regarded as a substantially infinite baffle, and this prevents the diffraction phenomenon of sound waves, so that a wavefront that can be regarded as a substantially plane wave can be obtained. Moreover, by embedding or surrounding the speaker device in a wall or partition, the main body of the speaker device does not become a visual hindrance.

In the second aspect of the invention, the same or different delays are applied to each vertical column of the plurality of speaker units whose delay means provides a wavefront that can be regarded as a substantially plane wave. Therefore, since there is no change in the sound image due to movement of the listening position, the apparent sound source position can be widened. Furthermore, it becomes easy to time-correct the distance difference between the listening position and the plurality of speaker units.

In the third aspect of the invention, the plurality of speaker units are of small diameter full range or coaxial type and have substantially the same characteristics. Therefore, since the characteristics of the sound emitted from each speaker unit are the same, it is possible to obtain a wavefront that can be regarded as a substantially plane wave.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of embodiments of the present invention will be explained based on the drawings. In the figures described below, parts common to those in FIG. 8 are designated by the same reference numerals, and redundant explanation will be omitted. FIG. 1 shows an embodiment of the speaker device of the present invention, in which main speakers 2 and 3 are arranged inside a room surrounded by a wall 1. As shown in FIG. Each main speaker 2,
A sub-speaker device group 6 for the L channel and a sub-speaker device group 7 for the R channel are buried in the wall 1b facing the rear wall 1a of the speaker 3.

Here, each sub-speaker device group 6, 7 is buried in the frame 9 of each speaker unit 8.
is attached so that the open end thereof is substantially flush with the wall 1. Further, each speaker unit 8 is of a small diameter full range or coaxial type. Furthermore, each sub speaker device group 6, 7 is configured as shown in FIG. 2, for example. In other words, each sub-speaker device group 6, 7 includes four sub-speaker devices 6a-6d, 7a-
7d.

[0017] Also, the dimensions based on these are, for example, length x
Width = 180cm x 90cm. Furthermore, each sub-speaker device 6a-6d, 7a-7d is provided with eight speaker units 8 each having a diameter of 10 cm and having the same characteristics, as shown in FIG. 3, for example. Furthermore, the distance between the centers of each speaker unit 8 is, for example, 15 cm. In addition,
These dimensions and number of speakers are not unique;
This can be changed depending on the dimensions of each room.

In the speaker device configured as described above, when surround reproduction is performed, the reproduced sound of the sound field information is output from each of the sub speaker device groups 6 and 7 embedded in the wall 1. At this time, since the opening end of the frame 9 of each speaker unit 8 of each sub-speaker device group 6, 7 is flush with the wall 1, a substantially planar surface is formed without causing a diffraction phenomenon of sound waves. A wavefront with a wide angle can be obtained. This provides an appropriate surround effect.

The reason why each sub-speaker device group 6, 7 is buried so that the open end of the frame 9 of each speaker unit 8 is flush with the wall 1b is as follows. In other words, as shown in FIG. 4, when each sub-speaker device group 6, 7 is fixed to the surface of the wall 1b or placed close to it, the sound waves are generated at the outer peripheral edge of each sub-speaker device group 6, 7. A diffraction phenomenon will occur. In this way, when the diffraction phenomenon of sound waves occurs, the wavefront is disturbed, resulting in disturbances in the frequency characteristics or the wavefront becoming non-flat.

FIG. 5 shows that each of the sub-speaker device groups 6 and 7 is simultaneously controlled by a delay circuit (not shown) for several ms to 50 m.
This shows an example of a case where a delay of about s is applied. Here, the reason why the delay value is set to approximately several ms to 50 ms is that if the delay value deviates from this value, the original sound will be heard as a different sound. With such a delay, the apparent position of each sub-speaker device group 6, 7 is adjusted to the wall 1.
Since it can be moved further outside b, it is possible to obtain the effect of creating an apparently larger space even if the space is somewhat narrow. Furthermore, when delays are applied all at once in this way, the spherical center point of the wavefront can be regarded as the apparent sound source position, as shown in FIG. It can be seen that as the area becomes larger, the apparent sound source position moves further away.

FIG. 7 shows S2' and S3 in each vertical column for each speaker unit 8 of each sub-speaker device group 6, 7.
This shows an example of a case where a delay is applied by a distance corresponding to ', S4' divided by the speed of sound. By applying the delay in this manner, the open end of each speaker unit 8 of each sub-speaker device group 6, 7 can be placed at an apparently approximately equal position with respect to the listening position R. That is, S4 +S4' = S1, S3 +S3' = S1
, S2 +S2' = S1, the distances from the listening position R can be made to be apparently the same.

[0022] In addition, when a delay with a different value is applied to each speaker unit 8 in a vertical row in this way, even if the angle of the wall 1 is different due to the layout of the room, the angle of the wall surface will be different. (Wall 1b')
Effects can be obtained. Furthermore, as shown in FIG.
, 7 and the wall 1b on the side where they are buried,
This can be prevented by applying a delay with a different value. In other words, since the phases of the sound waves in the same sound are shifted, the power of the standing wave is attenuated.

In this way, in this embodiment, each sub-speaker device group 6, 7 is buried in the wall 1b so that the open end of the frame 9 of each speaker unit 8 is flush with the wall 1b. can be regarded as a substantially infinite baffle, which prevents the diffraction phenomenon of sound waves and provides a wavefront that can be regarded as a substantially plane wave. Furthermore, since a wavefront that can be regarded as a substantially plane wave is obtained, by applying a delay to each speaker unit 8 of each sub-speaker device group 6, 7 at the same time, the apparent sound source position can be moved further away.

Furthermore, since a delay of a different value can be applied to each speaker unit 8 of each sub-speaker device group 6, 7 in each vertical column, it is possible to easily correct the difference in distance from the listening position. Furthermore, since each sub-speaker device 6a-6d, 7a-7d is of a flat plate type as shown in FIG. 3, it can be easily embedded in a building module such as a wall.

In this embodiment, a case has been described in which the open end of the frame 9 of each speaker unit 8 is exposed from the wall 1, but this is not limited to this example. This can give a visually clean feeling. In addition, in this embodiment, a case has been described in which each sub-speaker device group 6, 7 is buried in the wall 1, but this is not limited to this example, and each sub-speaker device group 6, 7 is similarly buried in a partition. Good too.

Further, in this embodiment, the case where the present invention is applied to a sub-speaker device has been explained, but the present invention is not limited to this example, and may be applied to a main speaker, and the effect as a surround speaker is great. . In other words, this is because it is suitable for reproducing sounds that do not require a sense of localization, such as sound field information, rather than sounds that require accurate sound image size and localization.

[0027]

As explained above, according to the speaker device of the present invention, a wall or partition can be regarded as a substantially infinite baffle, which prevents the diffraction phenomenon of sound waves and allows multiple speakers to be arranged close to each other. By doing so, it is possible to obtain a wavefront that can be regarded as a substantially plane wave. Moreover, by embedding or surrounding the speaker device in a wall or partition, the main body of the speaker device does not become a visual hindrance. Furthermore, since there is no change in the sound image due to movement of the listening position, the apparent sound source position can be widened. Furthermore,
It becomes easy to correct the distance difference between the plurality of sub-speaker units from the listening position. As a result, not only visual improvement can be achieved, but also an appropriate sound field feeling and sense of presence can be obtained.

[0028]

[Brief explanation of drawings]

FIG. 1 is a diagram showing an attached state of a speaker device of the present invention.

FIG. 2 is a front view showing the sub-speaker device group in FIG. 1;

FIG. 3 is a perspective view showing the sub-speaker device of FIG. 2;

FIG. 4 is a diagram for explaining the operation of the sub-speaker device group in FIG. 1;

FIG. 5 is a diagram showing a state in which a delay is applied to the entire sub-speaker unit of FIG. 1 at the same time.

6 is a diagram for explaining the effect when a delay is applied to the entire sub-speaker unit of FIG. 5 all at once; FIG.

7 is a diagram showing a state in which a delay is applied to each row of the sub-speaker unit in FIG. 1; FIG.

FIG. 8 is a diagram showing an example of arrangement of conventional surround speakers.

[Explanation of symbols]

1, 1a, 1b Wall 2, 3 Main speaker 6,7 Sub speaker device group 8 Speaker unit 9 Frame

Claims (3)

[Claims] 1. A speaker device having a plurality of speaker units for reproducing sound field information arranged at substantially equal intervals vertically and horizontally, the main body of the speaker device including the plurality of sub-speaker units. A speaker device characterized in that the speaker device is embedded or enclosed in a wall or partition such that an acoustic radiation surface thereof is flush with the wall or partition surface. 2. The speaker device according to claim 1, further comprising delay means for applying the same or different delays to each vertical column of the plurality of speaker units. 3. The speaker device according to claim 1, wherein the plurality of speaker units are of a small-diameter full-range or coaxial type and have substantially the same characteristics.