JP3065485B2 - Speaker system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field type sound reproducing system, and more particularly to a speaker system capable of obtaining a sound field with a high localization and a sense of expansion even when a speaker is installed at a low position.

[0002]

2. Description of the Related Art In the audio-visual field,
As a conventional method for localizing sound or the like on a screen, large front speakers 12 and 13 are arranged on the left and right sides of a screen 11 or small front speakers 12 and 13 and a center speaker 14 as shown in FIG. The synthesis was going on.

On the other hand, the conventional dipole type speaker system is mainly used as a wall-mounted side speaker for surround sound in the audio-visual field, and it has recently been proposed to use it as a THX side speaker (TV). John Society Technical Report Vol.
14. No76, PP37-41, December 1990).

In this speaker system, as shown in FIG. 13, full-range units 21 and 22 are arranged on the left and right slopes of a speaker box 20 having a substantially trapezoidal cross section so that the full-range units 21 and 22 have positive and negative polarities. Or Figure 1
As shown in FIG. 4, tweeter units 23 and 2 are provided on the left and right slopes.
4 and a woofer unit 25 in the front, and only the tweeter units 23 and 24 are of a positive and negative dipole type. In the drawing, reference numeral 26 denotes a side wall surface.

[0005] These conventional loudspeaker systems are installed in such a manner that only the sense of spreading is enhanced by utilizing the dipole-shaped figure-8 directivity. In addition, side speakers are installed so that localization obtained from the front speaker and the center speaker is not disturbed as much as possible. Therefore, the dipole speaker system rarely produces a synthesized sound image with other speakers.

[0006]

However, in the conventional method using two large front speakers, the installation space is limited, and a true upward localization cannot be obtained with the center speaker type. . On the other hand, as a dipole type speaker, it has been an important task to enhance the use value and application of sound field reproduction, and furthermore, to install the sound field at a low position without impairing the sense of spreading, and to further localize the sound image, especially the upper position.

An object of the present invention is to solve the above-mentioned conventional disadvantages and to provide a speaker system capable of obtaining a sound field with a high localization and a sense of expansion even when the speaker is installed at a low position.

[0008]

Means for Solving the Problems In order to achieve the above object, according to the present invention, there is provided a fuel cell system including a slanted baffle surface.
In a speaker system using a dipole type speaker having two baffle surfaces and speakers arranged on both baffle surfaces, two baffle surfaces are formed in a mountain shape and speakers are attached to both baffle surfaces respectively. ,
The sound radiated from the speaker on one baffle surface is reflected by a reflector and guided upward or downward, and the direct sound radiated from the speaker on the other baffle surface is compared with the dipole.
Combined above and below the speaker and its position
It was localized .

[0009] In this case, or at right angles to the top portion formed by two baffles surfaces, the angle between the two surfaces and the bottom surfaces of the angles and both the baffle surface of the top portion of the two baffle surfaces respectively an acute angle, a speaker for reflecting The mounting surface can be shorter than the mounting surface of the speaker that directly emits sound.

In addition, an elliptical speaker can be used as a speaker attached to the baffle surface, or two speakers on the reflecting side can be arranged to compensate for attenuation of sound pressure due to reflection. Furthermore, it can be used it is possible to provide an acoustic reflectivity of the flat seat bottom surface, the electrical delay device to a speaker mounted on one or both surfaces.
By using the reflector as a screen speaker and this screen speaker as a subwoofer, a 3D system can be configured with a speaker arranged on the mountain-shaped baffle surface.

[0011]

[Function] Of the speakers serving as the positive and negative sound sources attached to the two mountain-shaped baffle surfaces, the speaker on one baffle surface faces the listener, and the speaker on the other baffle surface faces the opposite side to the listener side. And a reflector is provided at a distance close to the speaker, so that the direct sound from the speaker on the one baffle surface and the reflected sound from the speaker on the other baffle surface are synthesized. To create a stereo synthetic sound field. Further, the localization and the spread are adjusted by combining the electric delay device and the speaker.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Example 1 A cabinet 10 shown in FIG. 3 has a mountain-shaped cross section, two oblique sides having a vertical angle of right angle and different lengths are baffle surfaces, a long side baffle surface is a first baffle surface 1, and a short side baffle surface is a baffle surface. The surface is configured as a second baffle surface 2 and the bottom side as a cabinet bottom surface 3. The side length of the first baffle surface 1 is 360 mm, and the side length of the second baffle surface 2 is 34 mm.
0 mm, and the length of the ridgeline of the mountain is 450 mm. Dipole speakers S having different polarities and the same diameter (5 inches) are attached to the first and second baffle surfaces 1 and 2 respectively.

Using two dipole type speakers S,
The left and right stereo systems are configured. As shown in FIGS. 1 and 2, one speaker 4 attached to each dipole type speaker S is turned to the listener H, and
Are positive (+). The speaker 5 on the opposite side
It is directed in the opposite direction to the listener H, and the polarity is negative (-).
Make each other.

FIGS. 4 and 5 show vertical directional characteristics of the dipole loudspeaker S having a vertical angle of 90 ° shown in this embodiment. 4 is for 500 Hz, and FIG. 5 is for 2 KHz. This characteristic is measured in an anechoic room, and the directional characteristic on the lower side shown by the broken line in FIG.

As shown by this directional characteristic, at 500 Hz, it takes a shape close to a typical figure-of-eight pattern. Although not shown, at 1 kHz, an area where the sound pressure increases at the peak of the chevron than the speaker mounting axis appears, and at 2 kHz in FIG. 5, it is confirmed that the sound pressure is larger by 20 ° inside the mounting axis than at 500 Hz or 1 kHz. it can.

1 and 2, the speaker S is placed on the floor F, and then reflected on the opposite side of the speaker 5 having a negative polarity, as shown in FIGS. Body 7 was placed. In this way, as shown in FIG. 1, the direct sound from the positive speaker 4 and the reflected sound from the negative speaker 5 are synthesized. As shown in FIG. 6, when the distance between the speaker 5 and the reflector 7 was set to 30 cm where the synthesized sound was in phase, a sound pressure higher than the direct sound on the floor F could be localized upward.

As shown in FIG. 8, if the angle C formed by the long side (first baffle surface 1) and the bottom side (cabinet bottom surface 3) is set to 20 °, the localization in the upper direction is relative to the floor surface F. To be on a vertical line. Therefore, if this angle is increased, it will be localized upward on the front side. Assuming that the listener H sits in a chair and has an ear at a height of 1 m, the condition of the cabinet 10 is defined as follows: the apex angle (angle A) is 80 ° and the short side (second
If the angle of the angle B between the baffle surface 2) and the bottom side (cabinet bottom surface 3) is set to 80 ° and the angle of the angle C is set to 20 °, the ear is located at the ear level.

In this embodiment, the loudspeaker S is placed on the floor F. However, it is obvious that the same effect can be obtained even if the loudspeaker S is placed on the ceiling if the vertical relationship of reflection is reversed. In this case, the localization is the downward localization. Cabinet 1
The shape of 0 is not limited to a triangular shape as in the present embodiment, and only the baffle surface is formed in a mountain shape as shown in FIG. Has the same effect.

Embodiment 2 As shown in FIG. 9, elliptical speakers 4 with a short diameter of 4 inches and a long diameter of 6 inches with different polarities are used as the speaker units 4 and 5.
a and 5a, and arranged so that the major axis of the speaker was aligned with the direction of the ridgeline of the mountain. In this arrangement, the directivity on the long diameter side becomes sharper, so that the recognition of the synthesized sound of the direct sound and the reflected sound is further clarified. As a method for clarifying the upward localization recognition, as shown in FIG. 9, it is effective to use one speaker 4 on the direct sound radiation side and two speakers 5 on the reflection side. That is, since the opposite side is worsened by reflection than the direct sound emission side, the localization is clarified by arranging two speakers and increasing the sound pressure.

Third Embodiment In a third embodiment, an electric delay device T1 is inserted in a speaker 4 that directly emits a sound, and FIG. 10A is a circuit diagram thereof. This embodiment is effective when the distance between the speaker system and the listener is short. In this case, the precedence effect of the direct sound works, and the direct sound and the synthesized sound due to reflection are separately recognized with a time delay. In order to avoid such a double recognition, the direct sound speaker 4 should be set for a few milliseconds to 20 ms.
ec delay, and the level of the sound intensity of the direct sound up to 6
If attenuated to dB, the lower sound localization near the floor due to the direct sound is eliminated, and the upper sound localization by the synthetic sound is obtained.

Fourth Embodiment In a fourth embodiment, the electric delay devices T1 and T2 are used in FIG.
As shown in FIG. 0 (B), moving the speaker installation location was replaced by electrical means. In the case of this example, as shown in FIG. 11, a thin speaker system 7C that also serves as a screen was used as the reflector 7. This speaker system 7C is a system that we have previously proposed as Japanese Patent Application No. 6-51078, and has a built-in thin speaker unit 7s and a duct 7d at the end face.
Is coming out of the bass.

Such a screen speaker is connected to the reflector 7.
And a 3D system is configured by disposing the dipole type speaker S as described above. The 3D system constitutes an AV (audio / visual) sound field, and the dipole loudspeaker system covers the vocal band, so that the upper localization is optimal for creating a sound field feeling. Therefore, the electric delay device T2 shown in FIG.
Once the dipole type loudspeaker system is installed, it is equivalent to changing the loudspeaker installation position by electrical means, and the frequency to be strengthened can be changed. Can be

Embodiment 5 In Embodiment 5, as shown in FIG. 10C, the electric delay devices T3 and T4 are added to both the speaker 4 on the direct sound side and the speaker 5 on the reflected sound side. When the amount of the loudspeaker 5 is set from several μsec to several msec, and the amount of the loudspeaker 4 is set to the amount of the loudspeaker 5 plus several msec to several tens msec, the delay amount is wider than in the first to fourth embodiments. Increased, and the higher localization sound image became slightly larger. Therefore,
Example 5 is most suitable for a source in which spread is important.

[0024]

According to the loudspeaker system of the present invention, it is possible to obtain a sound image localization and a sense of expansion in a vertical direction different from the installation position of the loudspeaker.
It is particularly effective for a sound field, and can configure a sound field without obstructing the field of view. In addition, the electric delay device can create and control a sound image having localization and expansion at desired vertical positions. Furthermore, of course, the speaker system can be used on a floor or ceiling in a narrow space, such as a sound field in a vehicle, by using a thin type speaker system. Is possible.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a speaker system according to the present invention.

FIG. 2 is a perspective view showing an installation example for stereo reproduction.

FIG. 3 is a perspective view of a speaker.

FIG. 4 is a diagram showing the directivity characteristics of a dipole type speaker at 500 Hz.

FIG. 5 is a diagram showing the directional characteristics of a dipole type speaker at 1 KHz.

FIG. 6 is a side view showing an example in which an installation distance of a dipole speaker with respect to a reflector is set.

FIG. 7 is a side view showing an example of a dipole type speaker in which a flat seat is arranged on a bottom side.

FIG. 8 is a side view showing an installation example of a dipole type speaker in which an angle such as a vertex angle is changed.

FIG. 9 is a perspective view showing an example in which a speaker arranged in a cabinet is an elliptical speaker.

FIG. 10 is a circuit diagram showing an example in which an electric delay device is used for a speaker.

FIG. 11 is a perspective view showing an example in which a screen speaker system is used as a reflector.

FIG. 12 is a front view showing a conventional speaker system.

FIG. 13 is a perspective view showing an example of a conventional dipole type speaker system.

FIG. 14 is a perspective view showing another example of the conventional dipole type speaker system.

[Explanation of symbols]

 S Dipole type speaker 10 Cabinet 1 First baffle surface 2 Second baffle surface 3 Cabinet bottom 4 Speaker 4a Elliptical speaker 5 Speaker 5a Elliptical speaker 6 Flat seat 7 Reflector 10 Cabinet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-54899 (JP, A) JP-A-59-15392 (JP, A) Jpn. Field (Int.Cl. ⁷ , DB name) H04R 1/34 310 G10K 15/00 G10K 15/12 H04R 1/40 310 H04R 5/02

Claims (9)

(57) [Claims] 1. A speaker system using a dipole speaker having two baffle surfaces including an inclined baffle surface and having speakers disposed on both baffle surfaces, wherein the two baffle surfaces are formed in a mountain shape. with speakers on both baffle surface is attached, it is reflected by the reflector one baffle surface radiated sound emitted from the speaker of the guided upward or downward, and a direct sound emitted from the speaker of the other baffle surface The above dipole type
Constant at Rutotomoni that position was synthesized by the above or below the speaker
Speaker system which is characterized in that to position. 2. The speaker system according to claim 1, wherein the top formed by the two baffle surfaces is a right angle. Wherein the angle between the two surfaces and the bottom surfaces of the angles and both the baffle surface of the top portion of the two baffle surface is an acute angle, respectively,
Loudspeaker system of claim 1, wherein the surface mounting the speaker to be reflected and being shorter than the surface mounting the speaker to emit sound directly. 4. A speaker system according to claim 1, characterized in that a sound wave reflective flat seat bottom surface. 5. The speaker system according to claim 1, wherein an electric delay device is used for a speaker mounted on one or both surfaces. 6. The speaker system according to claim 1, wherein the speaker is an elliptical speaker. 7. The speaker system according to claim 1, wherein two speakers are arranged on the baffle surface on the side of reflection. 8. The speaker system according to claim 1, wherein the reflector is a screen speaker. 9. The speaker system according to claim 8, wherein the screen speaker is a subwoofer, and forms a 3D system with the speakers arranged on the mountain-shaped baffle surface.