JP2556207B2 - Speaker system for wall hangings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a wall-mounted speaker system.

[0002]

2. Description of the Related Art FIG. 2 is a front view and a side sectional view showing a conventional wall-mounted speaker system. In the figure, 1 is a wall surface, 2 is a speaker cabinet mounted on the wall surface 1, and 3 is a speaker cabinet 2. An air chamber formed inside 4 is a speaker unit for low-pitched sound that is attached to the opening of the front wall 2a of the speaker cabinet 2, 5 is a speaker unit for mid- and high-pitched sounds, and 6 is an internal air chamber 3 of the speaker cabinet 1 and the outside. This is the port to combine.

In the above structure, by providing the port 6 for connecting the internal air chamber 3 of the speaker cabinet 1 and the outside, the sound of the bass speaker unit 4 is mainly radiated from the port 6, thereby lowering the sound. It is possible to reproduce up to the range.

FIG. 3 is a side sectional view showing a conventional speaker system with a front port shown in, for example, JP-A-60-98793. In FIG. 3, reference numeral 7 denotes a speaker cabinet 2 divided into two parts. 1, second air chamber 3a, 3
The baffle plate for mounting the speaker unit 4 for low-pitched sound which constitutes b, 6a is a port for connecting the first air chamber 3a with the outside of the cabinet, and 6b is a port for connecting the second air chamber 3b with the outside of the cabinet. .

In the configuration shown in FIG. 3, the sound from the low-pitched speaker unit 4 is radiated to the outside through the first air chamber 3a and the port 6a, so that the port 6
The air in a and the air in the first air chamber 3a act to cause air resonance, thereby acoustically forming a low-pass filter. Further, since an acoustic filter composed of the second air chamber 3b and the port 6b is attached to the back surface of the bass speaker unit 4, the bass portion can be spread over a wide band by setting the cutoff frequency of each of them. The reproduction frequency of is obtained.

[0006]

In the conventional wall-mounted speaker system as shown in FIG. 2, when a speaker system using a plurality of speaker units is constructed, a low-pass low-pass filter is realized by an active or passive filter. Requires a steep cutoff response to
The higher the filter structure, the higher the cost, and the fluctuation of the phase, which is not preferable in terms of sound quality.
In particular, it is a constant that cannot be realized by the passive type. Therefore, in order to reproduce a sufficient low frequency range, the volume of the cabinet must be increased and a speaker unit with a large diameter must be used, which increases the weight of the entire system and increases its size. The benefits tended to be lost.

A bass reflex type speaker system as shown in FIG. 3 has been proposed as one means for compensating for the lack of bass as described above. However, even in this case, the port 6a,
Due to the port resonance in the high frequency range of the sound pressure radiated from 6b, a peak occurs in the high frequency range of the sound pressure frequency characteristic, and a high frequency component unnecessary for operation is radiated, resulting in crossover with the speaker unit for sound quality or middle and high frequencies. There is a problem in that a filter with a network circuit must be added to obtain effective filter characteristics.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a small-sized wall-mounted speaker system having excellent wide-band frequency characteristics capable of low-frequency reproduction.

[0009]

In a wall-mounted speaker system according to the present invention, a bass part of a speaker cabinet is divided into at least three air chambers by dividing walls, and one of the dividing walls is used as a baffle plate for low temperature speaker. A first port for attaching the unit to connect the first air chamber on one side of the baffle plate to the outside of the cabinet, the second air chamber on the other side of the baffle plate, and the third air chamber adjacent thereto. And a third port for connecting the third air chamber and the outside of the cabinet to each other .
The mid-high range speaker unit for the mid-high range of the cabinet.
It is the one with the toe attached .

Further, in the above structure, the outlets of the first port and the third port to the outside of the cabinet are arranged toward the speaker cabinet mounting wall surface.

[0011]

In the speaker system according to the present invention, an effective low-pass filter is constituted by the three air chambers for bass and the three ports, and the connection with the midrange is improved.

Further, by directing the two ports leading to the outside of the cabinet to the wall surface and reflecting the low sound emitted from the wall surface, the baffle effect is produced and the sound pressure level in the low sound range is further improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a shown to cross-sectional side view of an embodiment of the present invention. In the figure, 1 is the wall surface, 2 speakers cabinet, 3a,
3b and 3c are first, second, and third air chambers for bass, which are formed by dividing the interior of the speaker cabinet 2 into three, 4 are speaker units for bass, 5 are speaker units for mid-high range, and 7 is bass. The baffle plate for mounting the speaker unit 4 constitutes a first partition wall that partitions the first air chamber 3a and the second air chamber 3b. Reference numeral 7a denotes a second partition wall which divides the second air chamber 3b and the third air chamber 3c, and 6a denotes an upper wall 2b of the speaker cabinet 2 having a blowout port on the wall surface 1
A first port for connecting the first air chamber 3a to the outside of the cabinet, and 6b is a second dividing wall 7a.
The second port 6c for connecting the second air chamber 3b and the second air chamber 3c is provided in the lower surface wall 2c of the speaker cabinet 2 with a blowout opening facing the wall surface 1, 3 is a third port for connecting the air chamber 3c of No. 3 and the outside of the cabinet.

In the above structure, the radiated sound from the low-pitched speaker unit 4 passes through the low-pass filter composed of the first air chamber 3a and the first port 6a in the front, and the second air chamber 3b in the rear. , Second port 6b, third
After passing through the low-pass filter composed of the air chamber 3c and the third port 6c, only the low frequency component is mainly emitted to the outside of the speaker cabinet 2. Furthermore, due to the air resonance caused by the action of the second air chamber 3b and the second port 6b provided on the second and third air chamber sides that can set a lower resonance frequency, a high frequency component leaking from the third port 6c. Can be reduced, and a sound component harmful to the crossover with the mid-high range speaker can be attenuated. Besides,
The outlets of the first port 6a and the third port 6c are the wall surface 1
Therefore, the low-frequency characteristics are further improved by the baffle effect of the wall surface 1.

The frequency f that acts on the air resonance is

[0016]

[Equation 1]

Is defined by Where L is the length of the port 5b, S is its cross-sectional area, Vb is the volume of the air chamber 4b,
Vc is the volume of the air chamber 4c, and C is the speed of sound in the air.

In the above embodiment, the bass part of the speaker cabinet is divided into three parts. However, by dividing the bass part into three or more parts and connecting adjacent air chambers with a port, the bass characteristic is further improved. You may allow it.

[0019]

As described above, according to the present invention, the bass portion of the speaker cabinet is divided into at least three air chambers by the dividing wall, and one of the dividing walls is used as the baffle plate to attach the low temperature speaker unit. , A first port connecting the first air chamber on one side of the baffle plate with the outside of the cabinet, a second air chamber on the other side of the baffle plate, and a third air chamber adjacent to the second air chamber. A second port and a third port that connects the third air chamber to the outside of the cabinet,
Having so that configure mounting medium tweeter units in the portion, bass intermediate to high temperature cut-off characteristic wide reproduction band of superior sound quality performance over well wideband, yet relatively small in a speaker system for a wall-hanging which can be constructed to give It is effective.

Further, in the above-mentioned structure, the outlets of the first port and the third port to the outside of the cabinet are arranged respectively toward the speaker cabinet mounting wall surface, so that the low-frequency characteristics are further improved. There is an effect that the speaker system for use is obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

2A and 2B are a front view and a side sectional view showing a conventional wall-mounted speaker system.

FIG. 3 is a side sectional view showing a conventional speaker system with a front port.

[Explanation of symbols]

 1 wall surface 2 speaker cabinet 3a first air chamber 3b second air chamber 3c third air chamber 4 bass speaker unit 5 mid-high range speaker unit 6a first port 6b second port 6c third port 7 Baffle plate (first dividing wall) 7a Second dividing wall

Claims (2)

(57) [Claims] 1. A mid-high range part and a low range part mounted on a wall surface.
In a speaker system for a wall-hanging with a speaker cabinet Ru Tona, bass portion of the speaker cabinet is divided into at least three air chambers by the dividing wall, mounting the woofer unit one of the dividing wall as a baffle plate, the A first port for connecting the first air chamber on one side of the baffle plate to the outside of the cabinet, and a second port for connecting the second air chamber on the other side of the baffle plate and a third air chamber adjacent thereto. And a third port for connecting the third air chamber to the outside of the cabinet ,
In the speaker cabinet, the middle and high frequencies are
A speaker system for wall hangings, which is equipped with a housing unit . 2. The speaker system for wall hangings according to claim 1, wherein the outlets of the first port and the third port to the outside of the cabinet are arranged toward the wall surface of the speaker cabinet.