JP2001016673A - Speaker system and acoustic reproduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a speaker system and an acoustic reproduction method by which excellent low frequency sound reproduction can be realized independently of a volume and an installed position (direction) of a speaker. SOLUTION: In this speaker system 1 where speaker units 31, 32 are arranged in series, a 1st bass reflex port 51 corresponding to a 1st cavity 21 and a 2nd bass reflex port 52 corresponding to a 2nd cavity 22 are configured to emit reproduction sound in different directions. Since the aperture of the bass reflex ports 51, 52 to the outside can be configured to direct in different optional directions, the bass reflex ports with a proper length can be designed in response to the structure and the size of the cavity and a degree of freedom is provided to an installed position (direction) of the speaker system 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker apparatus and a sound reproducing method, and more particularly, to a loudspeaker excellent in low-range sound signal reproducing ability and a sound reproducing method.

[0002]

2. Description of the Related Art A bass reflex (bass reflex) system has been used as a speaker for improving the reproduction rate of a bass sound signal.
2. Description of the Related Art Speakers such as the Kelton system are known.

As shown in FIG. 4A, a bass reflex type speaker includes a speaker unit 70 arranged in a cabinet 60 and a bass reflex port 80 for communicating the inside of the cabinet 60 with an external space. The bass reflex port 80 resonates with the low-frequency sound reproduced in the cabinet 60 and emits low-frequency sound from the opening.

[0004] A bass-reflex type speaker as shown in FIG. 4 (a) can improve the reproduction rate in a low-frequency range as compared with a closed-type speaker having no bass-reflex port. However, its bass reproduction ability was insufficient.

On the other hand, a Kelton type speaker is shown in FIG.
As shown in (b), a plurality of cavities (closed chambers) are formed in the cabinet 61 by the sub-baffle 62, and each of the cavities is provided with speaker units 71 and 72.

[0006] The Kelton speaker has improved bass reproduction capability as compared with the bass reflex speaker, but has insufficient bass reproduction capability.

Therefore, as a loudspeaker for enhancing bass reproduction, a bass loudspeaker system in which bass reflex ports are arranged in respective cavities formed in a cabinet of a Kelton type speaker is disclosed in Japanese Utility Model Registration No. 25553877. Have been.

In the speaker system of the present invention, FIG.
As shown in (c), the first bass reflex port 81 provided in the rear cavity of the first speaker unit 73
And a second bass reflex port 82 provided in a rear cavity of the second speaker unit 74 is configured to be connected to an external space on the front surface of the cabinet 63.

[0009]

[Problems to be Solved by the Invention] Utility model registration No. 255
In the bass speaker system disclosed in Japanese Patent No. 3877,
The openings of the bass reflex ports 81 and 82 are arranged on the front of the cabinet. For this reason, when the volume of the cabinet 63 is small, the length of the bass reflex ports 81 and 82 cannot be sufficiently secured, and the reproduction performance in the low-tone range may be insufficient.

Further, all the bass reflex ports 81, 82
Since the opening is disposed in front of the cabinet 63, if there is an obstacle or the like in front of the cabinet, the spread of the low-range sound reproduction is blocked. For this reason, sufficient low-range sound reproduction performance cannot be obtained. For example, when this speaker is installed in a trunk in the interior of an automobile, the front baffle may be closed depending on the installation location, and all the sound outlets may receive a large load, making it difficult to produce sound.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a speaker device and a sound reproduction method which are excellent in low-frequency range reproduction capability.

[0012]

In order to achieve the above object, a speaker device according to a first aspect of the present invention comprises a cabinet having an opening at a front surface, and a cabinet having an opening. A partition plate that is divided into at least two cavities, an opening of the cabinet and an opening of the partition plate, a speaker unit arranged so as to be arranged in series, and a cavity arranged in the cabinet for each cavity. Communicates with the external space,
And at least two bass reflex ports that open in mutually different directions and emit low-range reproduced sound to the outside.

According to this configuration, the opening direction of the bass reflex port can be arbitrarily set without being limited to the front surface.
As a result, a bass reflex port as long as possible can be designed for the size of the cavity, and a high bass reproduction capability can be achieved even with a speaker having a relatively small cabinet.

Further, since the bass reflex ports are opened in different directions, the spread of the low-frequency reproduced sound is not obstructed even when there is an obstacle. It is not necessary that all the bass reflex ports be open in different directions. It is sufficient that at least two bass reflex ports are open in different directions.

In order to achieve the above object, a sound reproducing method according to a second aspect of the present invention provides a sound reproducing method for a speaker having a plurality of cavities and a bass reflex port arranged so as to communicate the cavities with an external space. A reproduction method, characterized in that low-pitched sound reproduced in each cavity is enhanced, and the enhanced low-pitched sound reproduced is radiated in different directions in an external space through the bass reflex port.

According to such a configuration, the low-pitched sound reproduction sound can be radiated in an arbitrary direction, so that good low-pitched sound reproduction can be realized regardless of the installation position (direction) of the speaker.

[0017]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a sectional view of a speaker according to an embodiment of the present invention, and FIG. 1B is a perspective view thereof. As shown in FIGS. 1A and 1B, a speaker (speaker device) 1 includes a cabinet 10, a front baffle 11,
A sub-baffle 12, a first speaker unit 31,
It comprises a second speaker unit 32, a first bass reflex port 51, and a second bass reflex port 52.

The interior of the cabinet 10 is partitioned by a sub-baffle 12 and divided into two front and rear chambers.
The front chamber forms the first cavity 21, and the rear chamber forms the second cavity 22.

A first speaker unit 31 is arranged on the front baffle 11 of the cabinet 10 so that the diaphragm surface faces the outside, and the sub-baffle 12 has a first speaker unit 31 with the diaphragm surface facing the first cavity. Two speaker units 32 are arranged. That is, the first speaker unit 31 and the second speaker unit 32 are arranged in series (tandem) in the front-rear direction.

A second bass reflex port 52 is disposed in the second cavity 22 and is provided through a second opening 42 formed in a side surface of the cabinet 10.
2 and the external space. Since the length of the second bass reflex port 52 and the resonance caused by the second cavity 22 determine the basic reproduction band of the speaker device, the length of the second bass reflex port 52 is set to a sufficient length. .

The first bass reflex port 51 is disposed in the first cavity 21, and passes through the first opening 41 formed on the top surface of the cabinet 10.
1 and the external space.

Due to the effect of the series arrangement of the speaker units, the internal sound pressure of the first cavity 21
Lower than the internal sound pressure. For this reason, the level of the sound pressure from the first bass reflex port 51 is
Slightly lower than the sound pressure level from 2. For this reason, in order to widen the bass reproduction bandwidth of the speaker device without slackening, the resonance frequency of the first bass reflex port 51 should be slightly increased within a range not too far from the resonance frequency of the second bass reflex port 52. Thus, the length of the first bass reflex port 51 is set.

According to this configuration, the first bass reflex port 51 and the second bass reflex port 52 are opened in different directions (upward and lateral directions) from each other. Bass playback sounds are emitted in different directions. Therefore, even if there is an obstacle on the front or side of the speaker 1, the spread of the low-frequency reproduction sound is not obstructed, and the low-frequency reproduction sound can be reproduced regardless of the installation position (direction) of the speaker 1. Appropriate acoustic characteristics can be obtained.

Further, even when the depth of the speaker 1 is small and the lengths of the cavities 21 and 22 are short, the height and width of the speaker can be ensured so that the bass reflex port 5 can be provided.
The length of 1, 52 can be secured to an optimum value.

The operation of the loudspeaker 1 according to the present embodiment will be described by taking a case where the loudspeaker 1 is installed in an automobile as an example.

FIG. 2 is a diagram showing a case where the speaker according to the present embodiment is installed in an automobile.
Indicates an automobile, and 200 indicates a seat in the automobile.

Here, it is assumed that the speaker 1 is installed such that the front baffle 11 faces the seat 200 behind the seat 200 in the automobile 100.

In this case, since the first speaker unit 31 is arranged facing the seat 200, the reproduced sound radiated from the first speaker unit 31 is indicated by an arrow 1A in the figure.
As shown by (1), it reaches the listening position through the backrest of the seat 200, and as shown by the arrow 1B, is reflected by the backrest and spreads over the entire vehicle to reach the listening position.

The second opening 42 is provided in the cabinet 1
0, the sound radiated from the second bass reflex port 52 is reflected on a side wall in the vehicle as shown by an arrow 1C and spreads throughout the vehicle to reach the listening position. .

Further, the low-pitched sound reproduced from the first bass reflex port 51 formed on the top surface of the cabinet 10 is radiated above the speaker 1. The radiated reproduced sound diffracts the backrest of the seat 200 as shown by the arrow 1D and reaches the listening position as almost direct sound, and is reflected on the ceiling in the vehicle as shown by the arrow 1E and becomes almost the direct sound at the listening position. To reach.

Further, by arranging the speaker 1 so that the opening (first opening 41) of the first bass reflex port 51 faces the listening position, the low-range reproduced sound reaches the listening position as almost direct sound. Therefore, the conduction efficiency of reproduced sound is improved, and efficient bass reproduction can be realized.

That is, since each bass reflex port is oriented in a different direction, the installation position (direction) of the speaker 1 is set.
Can be installed so that optimum regeneration efficiency can be obtained according to the situation of the installation location. As a result, optimum low-range sound reproduction can be realized regardless of the installation location.

In the above embodiment, the speaker in which the opening of the bass reflex port is arranged on the top and side surfaces of the cabinet is shown, but the surface on which the opening is arranged is arbitrary.
For example, one of the bass reflex ports may be opened at the front. In this case, as shown in FIG. 3A, an opening 4 is provided at the center of the speaker unit 301 disposed on the front surface.
1 may be arranged so that the bass reflex port 51 communicates with the external space through the opening 41. As a result, even if the opening of the bass reflex port is arranged on the front surface, the area of the front surface can be minimized, and downsizing of the cabinet and sufficient bass reproduction can be realized at the same time.

In the above embodiment, the speaker having two cavities has been described, but as shown in FIG.
Third cavity 23 and third speaker unit 33
, A third opening 43, and a third bass reflex port 53 may be provided as three or more chambers. That is, n stages (n
The present invention can be applied to a cabinet having a cavity of 2 or more natural numbers. In this case, the number of cavities in which the speaker units are arranged is arbitrary,
Also, the number of speaker units arranged for each cavity is arbitrary.

In the above embodiment, the number of bass reflex ports provided in each cavity is one.
A plurality of bass reflex ports may be arranged in one cavity. In this case, as shown in FIG. 3C, a plurality of bass reflex ports 41A and 41B arranged in one cavity.
(42A, 42B) may be arranged so that the reproduced sound radiation directions are different from each other, or as shown in FIG. 3D, a plurality of bass reflex ports 41A, 41B (42A, 42B) corresponding to one cavity. ) May be arranged in the same direction.

In the loudspeaker according to the present invention, since the bass reflex ports corresponding to the respective cavities may be configured to emit reproduced sounds in different directions, for example, the opening directions of the respective bass reflex ports may be arbitrarily set. The cabinet may be configured to be variable.

[0038]

As described above, according to the loudspeaker according to the present invention, the bass reflex port can be designed so as to secure an optimum length according to the structure and size of each cavity. Furthermore, since low-range reproduction sounds are emitted in different directions for each bass reflex port, low-range reproduction is not hindered by the speaker installation position (direction). Therefore, optimum bass reproduction can be realized irrespective of the installation location and the speaker installation position (direction).

[Brief description of the drawings]

1A and 1B are diagrams showing a configuration of a speaker device according to a first embodiment of the present invention, wherein FIG. 1A is a cross-sectional view and FIG. 1B is a perspective view.

FIG. 2 is a diagram for explaining acoustic characteristics when the speaker device according to the first embodiment of the present invention is used in an automobile.

FIG. 3 is a diagram showing a modification of the embodiment of the present invention;
(A) is a cross-sectional view showing a configuration of a speaker device in which an opening is arranged at the center of a speaker unit, (b) is a cross-sectional view showing a configuration of a speaker device having a three-chamber structure, and (c) is a cross-sectional view showing a plurality of cavities in one cavity. FIG. 3D is a perspective view showing an appearance of a speaker device in which bass reflex ports of different directions are arranged, and FIG. 4D is a perspective view showing an appearance of a speaker device in which a plurality of bass reflex ports of the same direction are arranged in one cavity.

4A and 4B are cross-sectional views illustrating a configuration of a conventional speaker device, in which FIG. 4A illustrates a bass reflex type speaker, and FIG.
(C) shows a Kelton speaker.

[Explanation of symbols]

 Reference Signs List 1 speaker device 10 cabinet 11 front baffle 12 sub baffle 21, 22, 23 cavity 31, 32, 33, 301 speaker unit 41, 41A, 41B first opening 42, 42A, 42B second opening 43 third Opening 51 First bass reflex port 52 Second bass reflex port 53 Third bass reflex port 100 Automobile 200 Seats

Claims (2)

[Claims] 1. A cabinet having an opening in the front, a partition having an opening, and dividing the interior of the cabinet into at least two cavities in the front-rear direction; an opening in the cabinet and an opening in the partition A speaker unit arranged in series, and arranged in the cabinet for each cavity, communicating the cavity with an external space, opening in different directions from each other, and reproducing reproduced sound in a low frequency range to the outside. Radiate at least 2
A speaker device comprising: two bass reflex ports; 2. A method for reproducing sound in a speaker having a plurality of cavities and a bass reflex port disposed so as to communicate the cavities with an external space, wherein a low-range reproduction sound is enhanced and enhanced in each cavity. A sound reproduction method comprising: radiating low-range reproduced sound toward different directions in an external space through the bass reflex port.