JPH02152397A - Low sound frequency sound quality improving speaker enclosure - Google Patents

Abstract

PURPOSE:To reduce an air spring constant damping a speaker diaphragm system and to decrease the standing wave by providing a sound pressure buffer section to enclosures divided into two in forward and backward respectively. CONSTITUTION:An enclosure is divided into two in forward and backward directions by a buffle plate 2a provided with a speaker unit 1, a sound pressure buffer section comprising surrounding bodies 2d',2d''... made of a hard material such as a hard synthetic resin or wood is provided in the front part and a sound pressure buffer section comprising same surrounding bodies 2e',2e''... is provided in the rear part. Then the sound pressure radiated in front is divided into two, direct radiation from a hole 3 of a front plate 2b and wave going to the buffer section, and the sound pressure loss is increased based on the collision of the sound pressure in the buffer section and the length of the buffer section, and this is applied similarly in the rear enclosure, the air spring constant damping the speaker vibration system is reduced and the production of standing wave is decreased. As a result, the load of the speaker is freely varied from the characteristic similar to an infinite buffle to the close characteristic and excellent sound quality without much jumping and distortion, dull sound or high pitch sound is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Ll aspect of the invention] Industrial field of application The present invention relates to a speaker enclosure having means for damping sound pressure by means of a sound pressure damping path.

Conventional technology A speaker enclosure ideally using an infinite baffle has a wood-related problem in dealing with sound pressure toward the rear of the baffle board. Therefore, various methods have been proposed that have been devised regarding the sound pressure processing.

Typical methods include the closed system shown in Figure 8, the bass reflex system shown in Figure 9, and the drone cone system shown in Figure 1O.

There is a pack load horn system shown in FIG.

The bass reflex system, drone cone system, and backroat system attempt to effectively utilize the sound pressure emitted from the back of the speaker (LA). corn(
4) Because of the existence of
II: l diameter and or.

Because it has a resonant frequency determined by the duct length and/or drone cone, it tends to become loose or colored blind.

Another typical method, the sealed method, is the speaker (la
) The acoustic suspension system uses a large amount of sound-absorbing material to prevent the (f) coming out from the rear of the enclosure (2), and the air spring confined within the enclosure (2) reduces the lowest resonant frequency a(fO). low speaker (
There are air suspension systems that support the vibration system (1).

These closed models are unlikely to emit a low-pitched sound, or they may produce cone paper (resistance that hinders the vibration of the LBL, creating a clogged sound, air springs) (shaking too much, or enclosures ( 2) There was a tendency for the sound to become distorted due to the internal foot waves.

Problems to be Solved by the Invention The present invention can reduce the sound pressure within the enclosure and reduce the constant of the air spring damping the speaker vibration system, and at the same time can reduce standing waves. Therefore, unlike the bass reflex six system, drone cone system, and backrow lζ horn system, there is no uninterrupted, blind, monochromatic sound, and there is no clogged sound in the closed system, or sound bounce due to the resonance of the air spring. [1] It is an object of the present invention to provide a speaker enclosure that can produce ideal sound without producing excessive or distorted sweat.

[Structure of the Invention IIIt] Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides sound pressure buffering inside the front and rear enclosures to which the speaker unit is attached and which are divided into front and rear halves by a baffle plate. It has the structure of a speaker enclosure with a channel.

That is, the present invention provides a sound pressure buffer path with appropriate internal loss, spring constant, responsiveness, etc. in the front part and Mk part of the speaker enclosure, and absorbs the sound pressure from the front part of the speaker into the sound pressure buffer path. Receive with pressure 11 shock means.

Sound pressure from the rear of the speaker is rear sound pressure #! Shock sound pressure!
By receiving it with the a-impingement means, by giving the impression pressure damping means of the sound pressure damping path a spring constant corresponding to the air spring from the S limit, the degree of radial pressure damping is made to be the same as that of an infinite baffle. If a more bouncy sound like that of a closed enclosure is required, this can easily be achieved by closing the sound outlet of the sound pressure buffer path.

Embodiment 1 - Embodiment 1 This is an embodiment shown in Figs. , enclosures (2b) and (2d) (2d) made of wood or other hard materials.
(2d) (2d) is surrounded by hard synthetic resin, wood and other hard shell materials at the rear (2C) and (2e') (2a"
) (2e) (2a), an enclosure (2) is formed by the baffle plate (2a) and the enclosure, and the front plate (2b) of the enclosure dedicated (2) is formed.
) and the baffle plate (2a), partition plates (2d) (2d) (2d) (2d) are attached to form a sound pressure buffer path. There is also a partition plate (2e') forming a yt IEwl term between the rear plate (2c) and the backful plate (2a).
(2e') (2e) (2e) is attached.

(la) is the speaker body, (lb) is the cone paper (lc) forming the speaker unit (1), is also the center cap, (la) is the wiring connection, (is) is the ten terminal (1
f) is one terminal.

In the above embodiment, the sound pressure emitted to the front of the speaker body (la) is controlled by the hole (3) in the center of the tffJ part plate (2b).
) directly to the outside of the enclosure, and those exiting from the opening of the partition plate (2d') to the buffer path formed between (2d' and (2d)).

The two-divided back pressure advances inside this buffer path and collides again at the opening of the partition plate (2d), and the sound pressure weakens.
(2d') and (2d') from the opening of the partition plate (2d")
It is formed between! Proceeding to the first collision route, it is divided into two. The sound pressure divided into two parts travels inside this buffer path and collides again at the opening of the partition plate (2d), whereupon the sound pressure is further weakened.

It proceeds from the opening 11 of the partition plate (2d) to the 1lllr path formed between (2d) and (2d), and is divided into two parts. The divided sound pressure travels through this II impulse section and collides again at the opening of the partition plate (2d), and the sound pressure further weakens. The sound pressure passing through the sound pressure M street going out in this way increases as the length of the sound pressure buffer path and the number of collisions of sound pressure increases, and the loss of sound pressure increases. Depending on the degree of loss, the speaker load can be varied from characteristics similar to those of an almost infinite baffle to those of a sealed system.

Also, the sound pressure coming out behind the speaker body (la) is absorbed by the rear plate (
It advances from the opening of f2e') formed by 2c) and the partition plate (2e') to the buffer path formed between (2e) and (28'), and is divided into two parts.

The sound pressure divided into two parts travels inside this buffer path and passes through the partition plate (
At the opening in 2e), there is another collision, and the sound pressure weakens.
The sound pressure formed between (2e) and (2Q) advances from the opening of the partition plate (2e") and is divided into two parts. The sound pressure divided into two parts advances inside this buffer path. Then, they collide again at the opening of the partition plate (2e), and the sound pressure further weakens.
e), it progresses to the buffer road formed between it and is divided into two parts. The sound pressure divided into two travels inside the #7 channel, collides again at the opening of the partition plate (2e), and the sound pressure is further weakened, and the sound pressure is transmitted from the opening of the partition plate (2e) to the outside of the enclosure. The sound pressure that has passed through the sound pressure buffer path in this way goes out to The load on the speaker can be varied from characteristics similar to those of an almost infinite baffle to characteristics of a sealed system depending on the degree of oscillation.

Also, in Figures 1 and 5, the hole (3) in the front plate (2b)
) is an opening for directing the speaker (1b) to the front. The 1f quality can be changed by changing the sound pressure division ratio of the ML-1 in this hole (3) and the blind/E# term.

If the sound pressure buffer path is made larger than the ratio of the opening area of hole (3), the sound quality will be straight, and if the sound pressure buffer path is made smaller than the ratio of the opening area of hole (3), the sound quality will be soft l-. Become.

Second embodiment: The embodiment shown in FIG.
This shows an example in which the example is made into a hexahedron.

[Advantageous effect 1 of the invention] The present invention allows standing waves to immediately <<,
You can freely set the constant of the air spring that brakes the speaker lift system.

Therefore, unlike the bass reflex system, drone cone system, and back rotor horn system, there is no convergence and five-colored sound, and there is no clogged sound in the closed system, and there is too much sound bounce due to the resonance of the air spring. This has the effect of providing a speaker enclosure that can produce ideal sound without generating distorted sound.

[Brief explanation of the drawing]

Drawings 1 to 7I2I show an uninvented embodiment, in which FIG. 1 is a front view of the first embodiment of the present invention, FIG. 2 is a rear view IA, and FIG. Figure 4 is a Y-Y cross-sectional view of Figure 3; Figure 5 is a Z-Z cross-sectional view of Figure 31V; Figure 6 is a perspective view of the first embodiment of the present invention. No. 7 [4] shows a rectangular cross-sectional view of FIG. 4 and No. 51A of the first embodiment, No. 8121 is a vertical cross-sectional view of a known sealed type speaker enclosure, and FIG. 9 shows a known bass reflex type speaker enclosure. FIG. 1O is a longitudinal sectional view of a known drone cone type speaker enclosure, and FIG. 11 is a longitudinal sectional view of a known back rotor horn type speaker enclosure. (1) ・ ・ ・ ・ (2) ・ ・ ・ ・ (2a) ・ ・ ・ (2b) ・ ・ ・ (2C) ・ ・ ・ (2d) ・ ・ ・ (2e) ・ ・ ・ (3) ・ ・ ・・ ・Speaker unit ・Enclosure ・Baffle plate ・Front plate ・Rear plate ・mtA partition plate ・Rear partition plate ・Anaseori 2-+9 figure tusk 10 figure, /-2 q9 figure bone 11 figure

Claims (1)

[Claims] A speaker enclosure with a sound pressure buffer inside the front and rear enclosures, which are divided into two by a baffle plate with a speaker unit attached.