JPH01228295A - Speaker system - Google Patents

Abstract

PURPOSE:To reflect an acoustic wave radiated from a speaker unit on a ceiling face, a floor face, etc., and to reproduce an excellent sound field area by orienting the radiation main axis of the speaker unit to a ceiling face, a floor face or both side walls. CONSTITUTION:An angle theta formed by the radiation main axis E of the speaker unit 11 and the wall face 13a where a cabinet 12 is attached is set to an angle of >=45 deg.. The acoustic wave radiated from the unit 11 is reflected by the ceiling face 14, then, spreads in a room 13 and becomes a reproduced sound consisting essentially of an indirect sound. The sound pressure level of the indirect sound received by a listener in the room 13 is larger than the sound pressure level of a direct sound. The acoustic wave radiated from the until 11 spreads in all the room 13 to have an even sound pressure distribution and obtain the spreading feeling of a sound. Thereby, the excellent sound field area is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker system for audio reproduction.

2. Description of the Related Art In general, speaker systems such as those shown in FIG. 6 or 8 are known.

In the first conventional example shown in FIG. 6, reference numeral 1 indicates a speaker unit, and this speaker unit 1 is assembled into a cabinet 2 with its main radiation axis A facing forward. Here, the radiation principal axis is an axis extending toward the front of the speaker unit 1 in the direction in which the main portion of the sound wave emitted from the speaker unit 1 propagates.

The back of this speaker unit 1 is installed along the front wall 4a of the room 4, so that the sound waves from the speaker unit 1 are directly transmitted to the listener L.

In this case, the sound pressure level received by the listener L is as shown in Figure 7: The sound pressure level SPL (d) of the direct sound (direct sound wave that propagates twice) is very large, and the subsequent reverberant sound is rapid. It has become smaller.

In addition, in the second conventional example shown in FIG. Subikaunino towards both side walls 4b, 4c) lb.

IC is installed. In this case, the sound waves from the speaker unit 1a directly propagate to the listener L, and the sound waves from the speaker unit lb and IC are reflected once on the side walls 4b and 4c and then propagated indirectly. It has become.

In this case, as shown in FIG. 9, the sound pressure level received by the listener L is that the sound pressure level 5PL (d) of the direct sound is very high, and the sound pressure level 5PL (d) of the indirect sound (indirectly propagating sound waves) is very large. (r) is small.

Specific examples of speaker systems having the above configuration include Japanese Patent Application Laid-open No. 60-3297 and Japanese Utility Model Application No. 61-13.
There is one described in Publication No. 1193.

Problems to be Solved by the Invention However, in the above conventional speaker system, the first
In the conventional example, since only direct sound is reproduced, there are problems in that the sense of localization and direction of the reproduced sound is strong, the sense of sound spread is poor, and the sound pressure distribution in the reproduced sound field is difficult to become uniform. .

In addition, in the first example, since both the indirect sound and the direct sound are reproduced, the sense of localization and direction of the reproduced sound cannot be weakened much. There are problems in that the indirect sound scale becomes unbalanced, the sense of sound spread is poor, and it is difficult to achieve a uniform sound pressure distribution in the reproduced sound field.

Furthermore, due to the need for multiple speaker units for direct sound and indirect sound, and the structural complexity,
There are problems in that it is expensive and lacks practicality.

The present invention aims to solve the above-mentioned problems, and aims to provide a low-cost speaker system that can reproduce an excellent sound field range.

Means for Solving the Problems In order to achieve the above object, the present invention directs the main radiation axis of the speaker unit toward the ceiling, floor, or both side walls, and sets the angle between the speaker unit and the wall surface to which it is attached by 000. The angle is set to 45° or less.

By directing the main radiation axis of the speaker unit toward the ceiling, floor, or both side walls, the sound waves emitted from the speaker unit are reflected by the ceiling, floor, etc., and become reproduced sound that is mainly indirect sound. It can reproduce an excellent sound field.

Furthermore, since excellent reproduction sound can be obtained depending on the mounting angle of the speaker unit, the structure is simple and inexpensive.

Example Hereinafter, the present invention will be described in detail with reference to the drawings.

A first embodiment of the speaker system of the present invention is shown in FIGS. 1 and 2.

Reference numeral 11 in the figure indicates a speaker unit serving as a sound source, and this speaker unit 11 is built into a cabinet 12. The cabinet 12 has a wedge-shaped side surface that expands upward, and its upper surface 1
A speaker unit 11 is installed in 2a facing upward. This cabinet 12 is the wall 1 of the room 13.
It is attached to 3a.

The angle θ formed between the main radiation axis E of the speaker unit 11 and the wall surface 13a to which the cabinet 12 is attached is
is set to 0° or more and 45° or less.

In the speaker system configured as described above, the sound waves emitted from the speaker unit 11 are reflected on the ceiling surface 14 and then spread within the room 13, resulting in reproduced sound mainly consisting of indirect sound.

As a result, the sound pressure level received by the listener in the room 13 is reduced to the direct sound pressure level 5PL (as shown in FIG. 3).
d) The sound pressure level 5PL(r) of the indirect sound is higher than that of the indirect sound.

The difference between the sound pressure level SPL(d) of the direct sound and the sound pressure level 5PL(r) of the indirect sound can be specifically set to 3 dB or more by the settings of the present invention.

As a result, the sound waves emitted from the speaker unit 11 spread throughout the room 13, resulting in a uniform sound pressure distribution and a sense of spacious sound, making a limited space feel larger. Furthermore, by canceling out the sound image caused by the direct sound and weakening the sense of localization and direction of the sound, it is possible to create a particularly comfortable sound field space when reproducing music such as Pack Ground Me-Sick.

Furthermore, since the sound pressure distribution in the reproduction sound field space can be made uniform, there is little change in sound pressure due to differences in listening positions, and music can be heard comfortably from any position in the room 13.

Furthermore, since a speaker unit for direct sound is not used, costs can be reduced.

Next, a second embodiment of the present invention will be described.

As shown in FIGS. 4 and 5, in this embodiment, the speaker unit 11 includes a woofer unit 11a and two tweeters 11b disposed on both sides of the woofer unit 11a. Similarly to the speaker unit 11 in the first embodiment, the turf 1 unit 11a is disposed with the radiation main @F facing upward at an angle of 00 to 45 degrees with respect to the wall surface 13a, and has two tweeters 1 ]b is woofer unit 1
As in 1a, point the radiation main @F at 00 or more and 45° upward.
The woofer unit 11a is disposed below the woofer unit 11a, and is inclined in a direction that spreads to both sides of the woofer unit 11a.

As a result, the functions and effects of the first embodiment can be achieved, and in particular, the treble range can be more uniformly diffused.

In the first and second embodiments, the main radiation axes E and F of the speaker unit 11 are arranged toward the ceiling surface 14, but the present invention is not limited to this, and the main radiation axes E and F of the speaker unit 11 are arranged toward the ceiling surface 14. Even if it is arranged toward both side walls of the wall surface 13a to which it is attached, it is possible to achieve the same effect as the front/circulation arrangement.

Effects of the Invention As described above, the speaker system of the present invention has the following effects.

(1) Since the reproduced sound is mainly indirect sound, the sound waves emitted from the speaker unit spread throughout the room, making the sound pressure distribution uniform and giving a sense of spaciousness, making a limited space wider. If you can make it feel, you can create a very comfortable sound field.

(2) Since the sound pressure distribution in the reproduction sound field space can be made uniform, changes in sound pressure due to differences in listening positions are reduced, and music can be listened to comfortably from any position in the room.

(3) Since a speaker unit for direct sound is not used,
Cost reduction can be achieved.

[Brief explanation of the drawing]

1 is a front view showing a first embodiment of the speaker system of the present invention, FIG. 2 is a side sectional view of the speaker system of FIG. 1, and FIG. 3 is a listener in a room equipped with the speaker system of FIG. FIG. 4 is a front view showing a second embodiment of the speaker system of the present invention, FIG. 5 is a side sectional view of the speaker system of FIG. 4, and FIG. 7 is a schematic plan view showing the speaker system as the first conventional example, FIG. 7 is a graph showing temporal changes in the sound pressure level heard by a listener in a room equipped with the speaker system of FIG. 6, and FIG. FIG. 9 is a schematic plan view showing a speaker system as a conventional example, and is a graph showing temporal changes in the sound pressure level heard by a listener in a room equipped with the speaker system of FIG. 11, lla, IN), 1lc-'' speaker unit, 12 cabinet, 13... room,
13a...Wall surface, 14...Ceiling surface. Name of agent: Patent attorney Toshio Nakao (1st person, 2nd person)
Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Time Figure 8

Claims (1)

[Claims] A speaker system characterized in that the angle between the main radiation axis of the speaker unit and the mounting surface is 0° or more and 45° or less.