JPH01216700A - Stereo type speaker device - Google Patents

Abstract

PURPOSE:To obtain a reproduced sound image whose location is clear and a dynamic low tone with simple constitution by providing plural pairs of partition plates having a prescribed size of slit in the inside of a cabinet accommodating a couple of speakers of the same characteristic so as to form plural resonance sections and connecting the resonator sections and external space. CONSTITUTION:The inside of a cabinet 10 is sectioned into left/right side speaker storage sections 21, 22 and plural resonance sections 23-27. Slits 13s-15s are formed to the partition plates 13L-15R and the size is set to that only the sound of the frequency below a prescribed low frequency fc is passed. Thus, the middle/high frequency component in excess of the frequency fc among the rear sound of the speakers 1, 2 is shielded by the partition plates and the left/ right speaker containing sections 21, 22 are made independently at the middle/ high sound frequencies. Thus, the middle/high frequency component of the reproduced sound of the left/light speakers 1, 2 is not mixed in the inside of the cabinet 10, the sound image location is clear and the clear stereo reproducing sound is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stereo speaker device equipped with a single phase-inverting cabinet.

[Summary of the invention]

The present invention provides a plurality of pairs of partition plates having slits of a predetermined size inside a cabinet that houses a pair of speakers with the same characteristics to form a plurality of resonance parts, and the housing parts of both speakers are arranged in a medium-high alpha range. In addition to separating in the low range and communicating in the low range,
By communicating the resonance part with the outside space through the boats for both speakers, most of the volume of the cabinet can be used as a phase-inverting type in the bass range, making it possible to achieve clear localization with a simple configuration. This allows a reproduced sound image and powerful bass to be obtained.

(Prior Art) Conventionally, a stereo speaker device in which 211- speakers for the left channel and the right channel are housed in the same cabinet has been widely used because there are few restrictions regarding the installation location and it is easy to use. .

[Problem to be solved by the invention (a)] However, in this case, the back sounds of both speaker units are mixed inside the cabinet, and the clustered sounds, especially in the midrange and west range, sound muddy, and the reproduced sound image is distorted. There was a problem when the localization became unclear.

In addition, if a partition is installed inside the cabinet and the individual speakers are hermetically sealed, the problem caused by the mixing of medium and high frequencies will be resolved, but even if the volume of the cabinet for each speaker is sufficiently large, the low frequency resonance of the speakers A problem arises when the frequency is limited, which puts short cattle at a disadvantage.

Without affecting the low frequency reproduction limit of the speaker device, there is a relationship expressed by the following equation +11 between the upper limit V of the internal volume of the cabinet, the effective radius a of the speaker unit, and the low frequency resonant frequency fo. It is known.

Vσa4/fol...(1) With this,
In order to reduce the internal volume V of the cabinet, the effective radius a of the speaker unit should be small and the low resonant frequency fo
There was a problem that the reproduced piece lacked impact due to the lack of low frequency components.

In stereo playback, in order to obtain a rich static low content, the low frequency components of the left and right channels are mixed (monophonic) and reproduced by the central bass speaker (woofer), and the middle 111i frequency components are reproduced on the left and right channels respectively. with 1 speaker
However, this 31) method requires a low-frequency amplifier to drive the woofer, which makes the configuration complicated and has the problem of a IIJL value.

By the way, in order to increase the limit frequency fL while keeping the internal volume of the cabinet constant and expand the low range of the reproduced neck, the cabinet is a phase inversion type (bass reflex type).
It is widely practiced.

As is well known, the path reflex type cabinet gives an appropriate phase change to the sound waves emitted behind the speaker, so that they are emitted in phase with the sound waves emitted from the front of the speaker. The change in 0 phase, which is the result of this, is given by the equivalent gutter and the stiffness of the air inside the cabinet by providing a sound V-tube (port) on the speaker mounting surface. In this case, it is preferable that the Q of the speaker thread is about 0.5.

In view of this, an object of the present invention is to provide a reproduction system with clear localization.
To provide a stereo type speaker device with a simple configuration capable of obtaining an image and a powerful low pitch.

[Failure to solve the problem]

The present invention provides first and second speaker units +11, (21) having the same characteristics, a cavity I-(10) for housing the first and second speaker units, and a slit (21) of a predetermined size, respectively. 13s) to (lbs), and the plurality of pairs of partitioning machines are connected to the first and second partitions in the cabinet at predetermined intervals.
is disposed between the speaker units to form first and second speaker storage sections (21), (22) and a plurality of resonance sections (23) to (27), and to form an acoustic This is a stereo speaker device in which a cabinet is provided with an opening (18) that communicates with the speaker via a pipe (19).

[Function] According to the present invention, it is possible to obtain a reproduced sound image with clear dislocation and a powerful bass sound with a simple configuration.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device according to the present invention will be described below with reference to FIGS. 1 to 3.

The configuration of an embodiment of the present invention is shown in FIGS. 1 and 2. In both figures, °ζ, +1) and (2) are full-range speaker units with the same characteristics, for example, the aperture is 12c++, and the low resonant frequency is [o =
7011z, and is driven independently by left and right channel dominant amplifiers (not shown).

The cab (10) is shaped like a horizontally long rectangular bar, and has an opening (11) bored in its front face 1 (lof).
Speakers (11 and (2) are installed inside the cabinet (10) and (12), respectively. Between both speakers +1) and (2), the side panels (10c) and (10c) of the cabinet (10) are installed.
10d), the front plate (10f) and the back plate (10
r) and ζ across the top plate (10t) and bottom plate (job)
, multiple pairs of partition plates (13L), (13)1)
i (14L).

(14) ri; (15L) and (1ri)l) are attached at predetermined intervals. Continuing with the opening (18) drilled in the front plate (10f), there is a central 1-mon/1-shinomori (15L) and (1-store), and two side panels attached perpendicularly thereto. 19a) and (19b) form a port (19).

As a result, the inside of the cabinet (10) has left and right speaker storage openings l5 (21) and (22) for storing speakers +1) and (2), respectively, and a plurality of resonance parts (23) to (27). It is divided into The central resonance part (
27) communicates with the external space of the cabinet (10) through the port (19) described above.
3) The volumes of (27) are set so that they resonate at a predetermined low frequency fc, such as 300 Hz.

Each of the partition plates (13L) to (15)1) is provided with slits (13s) to (15s), respectively. The dimensions of these slits (13s) to (15s) are set so that only sounds with frequencies below [C] pass through, that is, so that they function as high-cut filters. For this reason, among the rear portions of speakers +11 and (2), mid-high frequency components exceeding frequency [C] are blocked by partition plates (13) to (15).
and (22) are independent in the Naka-Okubi region. Among the back sounds of speakers 11) and (2),
Only the low-frequency components of frequencies [C and above] are separated from the left and right speaker housings (21) and (22) by the partition plate (1).
3L) ~(1bL) and (13)1) ~(15M
), that is, the left and right resonance parts (23).

It passes through (24), (25), and (26) and flows into the central resonance part (27). As a result, both speaker housing sections (21) and (22) communicate with each other in the bass range.

In this example, the equivalent mass of Bo 1-(19) is
The stiffness exhibited by the air in both the speaker storage sections (21) and (22) is set so that it resonates near the low resonant frequency fo of the speakers (11 and (2)),
The speakers +1) and (2) can commonly use most of the volume of the cabinet (lO) as a bass reflex type speaker.

Also, since the effective areas of the imaging plates of both speaker units are added together and the effective area is doubled, the above-mentioned ti>
As is clear from the equation, the internal volume of the cabinet is four times that of a single speaker unit, and is approximately equal to that of two closed cabinets.

Historically, in this embodiment, left and right speakers (1) and (2)
A plurality of resonance parts (
23), (24), (27) and (25)
, (26).

(27) is involved, so port (19) for low frequency range
The negative mass increases.

As a result, as shown by the solid line in Figure 3, compared to the characteristics of the conventional bass reflex type speaker shown by the broken line in the same figure, the uniform reproduction range of bass sounds is lower than the low frequency resonance of speakers 11) and (2). The frequency is extended to a frequency much lower than the ro frequency, and a deep bass sound similar to that of the 3LJ system described above can be obtained.

Historically, in the mid-to-treble range, as mentioned above, both the speaker housings (21) and (22) are divided into multiple pairs of partitions & (1).
Due to 3) to (15), there is sufficient acoustic separation, so that the mid-high frequency components of the left and right speakers +1) and the reproduction stand of (2) do not mix inside the cabinet (10). The localization of the sound image is clear and clear stereo playback sound can be obtained.

In the above embodiment, the left and right speakers 111 and (2) are supplied with the left channel and right channel sound → signals, respectively, so that the single speaker device reproduces the sound μA4v →. However, the above actual h
Using two speaker devices in which the speakers (1) and (2) of example t1 are connected in series or in parallel, one speaker device is supplied with the left channel signal, and the other speaker device is supplied with the right channel 1 signal.
You may also supply 100 numbers. In this case, since the arrangement of both speaker devices is less restricted, a better stereo sound field is formed.

〔Effect of the invention〕

As detailed above, according to the present invention, a plurality of pairs of partition plates having slits of a predetermined size are provided inside a cabinet housing a pair of speakers having the same characteristics to form a plurality of resonance parts, The storage areas of both speakers are separated in the mid-high range and communicated in the low 8-range, and the sound part and external space are communicated via boats for both speakers, so (!ζt'r In the area, most of the volume of the cabinet can be used as a phase inversion type, and a stereo speaker device can be obtained with a simple configuration that can produce a clearly localized sound image and powerful bass.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a cross-sectional view showing the structure of an embodiment of a speaker device according to the present invention, and FIG. 3 is a diagram showing frequency characteristics of an embodiment of the present invention. 11) and (2) are Nepeikaunin!・, (1o) is the cabinet, (13) , (14) , (15)
is a partition plate (13s). (14s), (15s > is 1IllI gap, (
18) is the boat opening. (19) is a boat (acoustic tube), and (23) to (27) are resonance parts.

Claims (1)

[Scope of Claims] First and second speaker units having the same characteristics, a cabinet that houses the first and second speaker units, and a plurality of pairs of partition plates each having a gap of a predetermined size. and disposing the plurality of pairs of partition plates at predetermined intervals between the first and second speaker units in the cabinet to form first and second speaker housing sections and a plurality of resonance sections. A stereo speaker device characterized in that the cabinet is provided with an opening that communicates with the resonance section through an acoustic tube.