JPH05199581A - Wall speaker system - Google Patents

Abstract

PURPOSE:To provide a wall speaker system which is small-sized and can reproduce the bass band and has an excellent frequency characteristic. CONSTITUTION:The bass part of a speaker cabinet 2 is divided into first, second, and third air chambers 3a, 3b, and 3c by a baffle plate 7, to which a speaker unit 4 for bass is attached, and a dividing wall 7a, and a first port 6a which connects the first air chamber 3c and the outside of the cabinet and has the blow-off opening directed toward a wall surface 1, a second port 6b which connects second and third air chambers 3b and 3c, and a third port 3c which connects the third air chamber 3c and the outside of the cabinet and has the blow-off opening directed toward the wall surface 1 are provided. Thus, this wall speaker system has a wide reproducing band of the bass and a good cut-off characteristic of middle-pitched and high-pitched sounds and is superior in tone quality performance and has a relatively small-sized constitution.

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 4 formed inside is a speaker unit for low-pitched sound that is attached to an opening of the front wall 2a of the speaker cabinet 2, a speaker unit for mid and high-pitched sound, 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 to the outside, the sound from the speaker unit 4 for bass 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, Japanese Patent Laid-Open No. 60-98793. In FIG. 3, numeral 7 indicates 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 sound which constitutes b, 6a is a port connecting the first air chamber 3a with the outside of the cabinet, and 6b is a port connecting the second air chamber 3b with the outside of the cabinet. ..

In the configuration of 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 as well, it is possible to set the cut-off frequency of each of them to a bass portion over a wide band. The reproduction frequency of is obtained.

[0006]

In the conventional wall-mounted speaker system 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 order of the filter, 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, and crossover with the speaker unit for sound quality or middle and high frequencies However, 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 in order to solve the above problems, and an object thereof is to obtain a wall-mounted speaker system which is compact and has excellent 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 connecting the unit and connecting the first air chamber on one side of the baffle plate with 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 to the outside of the cabinet.

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 three air chambers for low sound and three ports, and the connection with the middle frequency range 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 generated 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. 1 is a side sectional view showing an embodiment of the present invention. In the figure, 1 is a wall surface, 2 is a speaker cabinet, 3a,
3b and 3c are first, second, and third air chambers for bass, which are formed by dividing the inside 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 that 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 wall 1
A first port 6b 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 on the lower surface wall 2c of the speaker cabinet 2 with a blowout port facing the wall surface 1, It is a third port that connects the air chamber 3c of No. 3 and the outside of the cabinet.

In the above structure, the radiated sound from the bass 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 including 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. Further, 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, the high frequency component leaking from the third port 6c. Can be reduced, and a harmful sound component due to 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
Since the baffle effect of the wall surface 1 is aimed at, the low frequency characteristic can be further improved.

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.

Although the bass portion of the speaker cabinet is divided into three in the above embodiment, the bass characteristic is further improved by dividing the bass portion into three or more and connecting adjacent air chambers with ports. It may be allowed to.

[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 thereto. Since the second port and the third port for connecting the third air chamber and the outside of the cabinet are provided, the bass reproduction range is wide, the cutoff characteristic at middle and high temperatures is good, and the sound quality is excellent. Moreover, there is an effect that a wall-mounted speaker system that can be configured in a relatively small size can be obtained.

Further, in the above-mentioned 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, so that the low-frequency characteristic is 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.

FIG. 2 is 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 1st air chamber 3b 2nd air chamber 3c 3rd air chamber 4 Bass speaker unit 5 Mid-high range speaker unit 6a 1st port 6b 2nd port 6c 3rd port 7 Baffle plate (first dividing wall) 7a Second dividing wall

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[Procedure amendment]

[Submission date] October 30, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

Means for Solving the Problems] speaker system for wall-hanging according to the present invention divides the bass portion of the speaker cabinet to at least three air chambers by the dividing wall, for low sound one of the dividing wall as a baffle plate A first port for attaching the speaker 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 adjacent thereto. It is provided with a second port for connecting the chamber and a third port for connecting the third air chamber with the outside of the cabinet.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[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 inside 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 that 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 wall 1
A first port 6b 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 on the lower surface wall 2c of the speaker cabinet 2 with a blowout port facing the wall surface 1, It is a third port that connects the air chamber 3c of No. 3 and the outside of the cabinet.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

[0019]

As is evident from the foregoing description, according to the present invention, by dividing the bass portion of the speaker cabinet to at least three air chambers by the dividing wall, the bass speaker unit one of the dividing wall as a baffle plate Attaching, a first port for connecting the first air chamber on one side of the baffle plate to the outside of the cabinet, a second air chamber on the other side of the baffle plate, and a third air chamber adjacent thereto a second port that, since it is configured such that and a third port for coupling said third air chamber and the outside of the cabinet, the cut-off characteristics of the low frequency range of the reproduction band is wide middle and high sound is good sound quality performance superior Moreover, there is an effect that a speaker system for wall hangings, which can be configured in a relatively small size, is obtained.

Claims (2)

[Claims] 1. A wall-mounted speaker system having a speaker cabinet mounted on a wall surface, wherein a bass portion of the speaker cabinet is divided into at least 3 by a dividing wall.
The air conditioner is divided into two air chambers, a low temperature speaker unit is attached using one of the dividing walls as a baffle plate, and a first port for connecting the first air chamber on one side of the baffle plate with the outside of the cabinet and the baffle A second port for connecting the second air chamber on the other side of the plate and a third air chamber adjacent to the second air chamber; and a third port for connecting the third air chamber to the outside of the cabinet Speaker system for wall hangings. 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.