JPH07154889A - Sound reproduction device - Google Patents

Abstract

PURPOSE:To provide a sound reproduction device for realizing reproducing sound from a large sound source and realizing surround reproduction as if wrapping a listner's body. CONSTITUTION:This sound reproduction device is provided with plural small hole opening parts 7 in the shape of concentric circles larger than the diameter or a diaphragm for emitting the sound from a speaker 3 on a front surface baffle 5 in the direction of the emission surface of the sound of the speaker 3 attached on a center partition plate 2 provided inside a cabinet 1. Also, the speakers are arranged in front, on the side and at the back of a listener as surround speakers and the sizes of signals impressed to the speakers are successively enlarged in the order of front, side and back. Further, in this sound reproduction device composed by arranging the speakers in front, on the side and at the back of the listener as the surround speakers, the sound reproduction center of the speaker in a side direction is lower than a horizontal surface whose center is the ear of the listener.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device for providing an excellent surround reproduced sound for reproducing a three-dimensional sound field.

[0002]

2. Description of the Related Art In recent years, surround reproduction has been put to practical use in which a center channel and rear effect sound are added to stereo reproduction of L channel and R channel to realize stereophonic sound field reproduction. As a surround speaker, a set of speakers is arranged behind the viewer. Hereinafter, description will be given with reference to the drawings. FIG. 6 shows a schematic perspective view of a conventional surround reproducing apparatus. In FIG. 6, L, C, and R three speakers 10, 12, and 11 for performing stereo reproduction and center channel reproduction are arranged in front of the viewer 9. A speaker 20 that reproduces a pair of surround sounds is arranged behind. This configuration realizes surround playback.

[0003]

However, in the above-mentioned conventional surround reproducing apparatus, since the room is not large, a sufficient distance cannot be obtained between the surround speaker and the listener's ears, so that the sound does not spread sufficiently. The sound reproduced by the surround speakers arranged in the rear is not a reproduction sound that wraps around the body of the viewer, but an unnatural reproduction sound that is reproduced like a point sound source from the position of the speaker. The present invention solves the above-mentioned problems, and an object of the present invention is to realize a sound reproduction device that realizes a sound field that wraps around the body by surround sound reproduced from a large sound source and obtains excellent sound effects. It is a thing.

[0004]

In order to achieve the above object, the present invention radiates a sound from a speaker on a front baffle in the direction of the sound radiating surface of a speaker mounted on a partition provided inside a cabinet. Is a sound reproducing device in which a plurality of small hole openings are provided in a concentric shape larger than the diaphragm diameter,
In addition, it is a sound reproducing device in which speakers are arranged in front, side, and rear of the viewer as surround speakers, and the magnitude of the signal applied to the speaker is sequentially increased. As surround speakers, speakers are arranged in front, side, and rear of the viewer. In the sound reproducing device, the sound reproducing device is characterized in that the reproduction center of the speaker in the lateral direction is installed below the horizontal plane centering on the ear of the listener.

[0005]

According to the present invention, by virtue of the above construction, a plurality of small hole openings for radiating the sound from the speaker are vibrated on the front baffle in the direction of the sound radiating surface of the speaker mounted on the partition provided inside the cabinet. By providing the concentric circles having a larger diameter than the plate diameter, the sound from the diaphragm of the speaker is reflected and diffused inside the cabinet, and then becomes a sound with a random phase and is radiated to the outside from the opening. The opening has a plurality of small holes arranged concentrically with a diameter larger than that of the diaphragm.
In addition, the sound is radiated at random because the reflection and diffusion are repeated many times inside the cabinet, and the sound radiated from the sound is closer to the sound from a larger sound source than the diaphragm itself, which is less likely to cause phase interference. Furthermore, by increasing the opening ratio of the opening from the center of the concentric circle toward the outer peripheral portion, the power of the sound radiated from the outer peripheral portion and the power of the sound radiated from the inner peripheral portion can be made uniform, and It is close to the sound from the plane.

In front of the viewer as a surround speaker,
In the sound reproducing device in which the above-mentioned speakers are arranged laterally and rearward and the magnitude of the signal applied to the speaker is increased successively, the sounds from the front, lateral, and rear speakers are combined, so that a larger sound source is obtained. Moreover, by strengthening the magnitude of the input rearward, the sensitivity of the rear sound is relatively increased, and the sound can be localized easily in the rear with a large sound source. Further, in a sound reproducing device in which the above-mentioned speakers are arranged in front of, in the side of, and behind the audience as surround speakers, the sound is set with the reproduction center of the horizontal speaker below the horizontal plane centering on the listener's ear. In the reproducing apparatus, since the surround signal is a monaural signal, the sound reproducing apparatus can eliminate the rising effect of the sound image being localized at the upper part of the head because the sound source is right next to the ear.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a sound reproducing device in a first embodiment of the present invention. As shown in Figure 1,
Inside a cabinet 1 having a substantially rectangular parallelepiped shape, a partition plate 2 for partitioning the cabinet 1 into upper and lower parts is provided. A speaker 3 that emits sound is attached to the intermediate partition plate 2, and the sound from the diaphragm 4 is emitted before and after the intermediate partition plate 2. The baffle 5 of the cabinet 1 exists in the front direction of the diaphragm 4. The baffle 5 has a plurality of small hole openings 7 provided on a plurality of concentric circles 6 having the same central axis as the diaphragm 4. The small hole opening 7 is larger toward the outer circumference of the concentric circle 6. Further, the size of the concentric circles 6 is larger than that of the diaphragm 4. As shown in FIG. 2, it is preferable that a virtual cone 8 formed by the outermost circumference of the concentric circles 6 and the acoustic center of the speaker 3 wrap around the body of the viewer 9.

The operation of the above structure will be described. The sound of the speaker 3 attached to the partition upper plate 2 provided inside the cabinet 1 is reflected and diffused inside the cabinet 1 and then becomes a sound having a random phase. It is radiated to the outside from the small hole opening 7. The small hole openings 7 are arranged concentrically with a diameter larger than that of the diaphragm 4, and the phase of the sound is random, so the sound radiated from it becomes closer to the sound from a larger sound source than the diaphragm alone. . Since the phase is random, even if the small holes are radiated into the air, there is little deterioration in directivity due to phase interference. Further, by increasing the aperture ratio of the small hole opening 7 from the center of the concentric circle 6 toward the outer peripheral portion, the opening area per unit area can be made equal. Therefore, the power of the sound radiated from the outer peripheral portion and the power of the sound radiated from the inner peripheral portion can be made uniform, and the sound becomes closer to the sound from the plane.

Next, a second embodiment will be described. FIG. 3 is a block diagram showing an audio reproducing apparatus according to the second embodiment of the present invention. In FIG. 3, speakers 10 and 11 for reproducing a stereo signal are arranged on the left and right sides of the viewer 9, and a speaker 12 for reproducing a center channel is arranged at the center of the front surface. Left and right stereo signals are applied to the speakers 10 and 11. Surround speakers 13 (front), 14 surround the viewer 9 in front of, next to, and behind the viewer 9.
(Horizontal) and 15 (rear) are installed. Surround speakers
A surround signal is applied to 13, 14 and 15, but an input signal to the surround speakers 13 and 14 is attenuated by attenuators 16 and 17. As described above, the present invention is the sound reproducing device in which the magnitude of the signal applied to the surround speaker is gradually increased backward by the attenuators 16 and 17.

To explain the operation in the above configuration, since the surround speakers are arranged in front of, in the side of, and behind the viewer 9, the sound field due to the surround signals reproduced by the surround speakers 13, 14, 15 is these three. It becomes a synthetic sound field of two speakers and works as a large sound source. Moreover, since the input signal increases toward the rear, it is possible to correct the difference in sensitivity between the ears due to the rear and front sources. Moreover,
The surround signal opposes the front speakers 10, 11 and 12.
Since the signal for localization to the rear is included, it is preferable that the sound pressure becomes higher toward the rear.

Further, FIG. 4 is a block diagram showing a third embodiment of the present invention. In FIG. 4, speakers 10 and 11 for reproducing a stereo signal are arranged on the left front side of the viewer 9, and a speaker 12 for reproducing a center channel is arranged on the center of the front surface. Left and right stereo signals are applied to the speakers 10 and 11. Surround speakers 13 (front), 18 (horizontal), 18 (horizontal), in front of, next to, and behind the viewer so as to surround the viewer 9.
15 (rear) is installed. Next to the viewer 9, as a surround speaker, the center 19 of the sound source is the center of the ear of the viewer 9.
As shown in FIG. 5, the sound images reproduced by the DL-lowered surround speakers 13, 18, 15 are arranged so that the positions in the horizontal plane of the sound images are matched with each other.

To explain the operation in the above configuration, since the surround speakers are arranged in front of, in the side of, and behind the viewer 9, the sound field generated by the surround signals reproduced by the surround speakers 13, 18, 15 is these three. It becomes a synthetic sound field of the speaker and works as a large sound source. Moreover, since the center of the speaker installed in the lateral direction of the viewer's 9 ear is below the ear, the sound image generated when the monaural signal enters from both sides to both ears is not positioned directly beside the viewer's head. It is possible to prevent the rising effect localized at the upper part. Therefore, the sound images of the front, side, and rear speakers of the viewer match on the horizontal plane, and the surround sound with good localization can be reproduced.

[0013]

As is apparent from the above description, according to the present invention, a plurality of small hole openings for emitting sound from the speaker are provided on the front baffle in a concentric circle shape larger than the diaphragm diameter. Since it is a playback device, it is possible to perform playback as if the sound source was greatly surrounded by the sound even if the surround speaker is near the ear. In addition, a loudspeaker is arranged in front of, behind, and behind the viewer as a surround speaker, and an acoustic playback device in which the magnitude of the signal applied to the speaker is sequentially increased is provided. Moreover, a sound field with a higher sound pressure can be formed in the rear. Therefore, there is an effect that it is possible to provide a sound reproducing device that is surrounded by sound and is excellent in localization.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of the first exemplary embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a third exemplary embodiment of the present invention.

FIG. 5 is a configuration diagram showing a relationship between a sound source and a viewer according to an embodiment of the present invention.

FIG. 6 shows a conventional surround playback device.

[Explanation of symbols]

1 ... Cabinet, 2 ... Middle partition plate, 3 ... Speaker, 4 ... Diaphragm, 5 ... Baffle, 6 ... Concentric circles, 7
… Small hole opening, 8… virtual cone, 9… viewer, 10,
11, 12, 20 ... Speaker, 13, 14, 15, 18 ... Surround speaker, 16, 17 ... Attenuator, 19 ... Center of sound source, 20
... center of the ear.

Claims (4)

[Claims] 1. A plurality of small hole openings for radiating the sound from the speaker are provided on a front baffle in the direction of the sound radiating surface of the speaker mounted on a partition provided inside the cabinet. The concentric circles are larger than the diaphragm diameter. Sound reproduction device provided in the shape of a circle. 2. The sound reproducing device according to claim 1, wherein the aperture ratio of the opening is increased from the center of the concentric circle toward the outer peripheral portion. 3. As a surround speaker, the speakers according to claim 1 are arranged in front of, in the side of, and behind the audience, and the magnitude of the signal applied to the speaker is increased in the order of front, side, and rear. Characteristic sound reproduction device. 4. A sound reproducing apparatus comprising the speaker according to claim 1 or 2 as a surround speaker arranged in front of, in the side of, and behind the viewer, wherein the sound reproducing center of the speaker in the lateral direction is set to the listener's ear. An audio reproducing device characterized by being installed below a horizontal surface as a center.