JPH0787628B2 - Speaker system for bass reproduction - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bass reproduction speaker system.

(B) Prior Art / Problems to be Solved by the Invention Conventionally, as a bass reproduction speaker system, for example, a bass reproduction speaker system as described in JP-A-63-120586 is known. ing.

FIG. 4 is a sectional view showing the speaker system described above.

However, in the above-mentioned conventional device, unnecessary high frequency components pass through the acoustic tube 10 and enter from the opening 11 to the front of the speaker system.
It had the drawback of leaking to 12.

The present invention has been made in view of the above points, and an object thereof is to provide a bass reproduction speaker system capable of further attenuating unnecessary high frequency components.

(C) Means for Solving the Problem The present invention comprises an acoustic tube continuously formed from the rear surface of the speaker unit, an empty room provided on the front surface of the speaker unit, and a bass reflex port provided in the empty room. In the speaker system for low-pitched sound reproduction, the opening of the acoustic tube is connected to the vacant room.

Further, the resonance frequency of the port of the bass reflex and the frequency at which the half wavelength is applied to the acoustic tube are configured to be substantially the same.

(D) Action According to the present invention, a low-pitched sound reproduction including an acoustic tube continuously formed from the back surface of the speaker unit, an empty room provided in the front surface of the speaker unit, and a bass reflex port provided in the empty room. In the speaker, since the opening of the acoustic tube is connected to the empty room, the high frequency component reproduced by the speaker unit is attenuated by the filter effect of the empty room.

Also, because the resonance frequency of the bass reflex port and the frequency of the half-wave on the acoustic tube are set to be approximately the same, the sound emitted to the front side of the speaker unit and the sound emitted to the rear side of the speaker unit are emitted. The sound of the opposite phase that has been made becomes the same phase and is added to the part consisting of the vacant room and the port.

Since the vacant room and the port form a bass reflex type speaker system, the bass range is efficiently radiated to the outside.

(E) Embodiment An embodiment of the bass reproduction speaker system according to the present invention will be described with reference to FIGS. 1 to 3.

In the figure, 1 is a speaker enclosure, 2 is a speaker unit, 3 is an acoustic tube formed continuously from the rear side 2a of the speaker unit 2, 4 is a partition plate provided to form the acoustic tube 3, and 5 is a speaker unit. 2 is a vacant chamber provided on the front surface 2b, 6 is a port connecting the vacant chamber 5 and the outside 7 of the speaker enclosure 1, 8 is an opening of the acoustic tube 3, and in this opening 8, the acoustic tube 3 and the vacant chamber are connected. 5 is connected.

Further, the resonance frequency of the port 6 and the frequency at which the half wavelength is applied to the acoustic tube 3 are configured to be substantially the same.

In the low-pitched sound reproducing speaker configured as described above, the sound emitted to the front surface 2b of the speaker unit 2 is guided to the vacant chamber 5, but the front surface 2b of the speaker unit 2 includes the vacant chamber 5 and the port 6. Since the bass reflex type speaker system B is formed, the bass range near the resonance frequency of the port 6 is guided to the outside 7 of the speaker enclosure 1 in a substantially opposite phase.

On the other hand, the sound emitted to the back side 2a of the speaker unit 2 is guided to the opening 8 of the acoustic tube 3 through the acoustic tube 3, and the frequency at which a half wavelength is applied to the acoustic tube 3 of the speaker system for bass reproduction. The bass region in the vicinity has the opposite phase again at the opening 8.

The sound that has passed through the acoustic tube 3 is also added to the bass reflex type speaker system B. Therefore, in this bass reflex type speaker system B, the sound on the front surface 2b side of the speaker unit 2 and the sound on the back surface portion 2a are added, Further, the bass range is reproduced efficiently.

In particular, in the present invention, the resonance frequency of the port 6 and the frequency at which the half wavelength is applied to the acoustic tube 3 are configured to be substantially the same, so that the reproduction efficiency is significantly improved.

Now, the sound radiated to the acoustic tube 3 is most emphasized at the frequency whose wavelength is twice the length of the acoustic tube 3 and is radiated to the outside of the opening 8 (vacant chamber 5). Frequencies other than the above are also radiated to the outside of the opening 3. Of these, the sound of a frequency whose wavelength is an integral multiple of the length of the acoustic tube 3 has a phase opposite to that of the sound on the front surface 2b side of the speaker unit 2 and cancels or is attenuated. Since it is guided to the empty space 5, the high frequency component is efficiently attenuated by the filter effect of the empty space 5.

Since the vacant chamber 5 and the opening 8 of the acoustic tube 3 are connected, the acoustic tube 3 becomes equivalently long when viewed from the acoustic tube 3, and equivalently when viewed from the vacant chamber 5. Since the volume of the vacant chamber 5 is increased, the reproduction band in the low sound range is expanded.

2 and 3 show another embodiment of the present invention.
In the figure, by providing the partition plate 4A, another acoustic tube 3A is provided in addition to the acoustic tube 3, and the openings 8 and 8A of the two acoustic tubes 3 and 3A are respectively connected to the vacant chamber 5.

In FIG. 3, two speaker units are provided, one speaker unit 2 is provided with an acoustic tube 3 and another speaker unit 2A is provided with another acoustic tube 3A.
The openings 8 and 8A of the respective acoustic tubes 3 and 3A are connected to the vacant chamber 5.

In FIGS. 2 and 3, the acoustic tubes 3 and 3A may have the same length or different lengths.

Also, the number of vacant rooms may be divided into two instead of one.

(F) Effects of the Invention Since the bass reproduction speaker according to the present invention is configured as described above, the following effects are achieved.

Unnecessary high frequency components can be significantly attenuated.

The bass reproduction efficiency can be improved.

Since there is only one opening in the speaker system, the degree of freedom of installation location is improved.

In addition, it has excellent features such as a simple structure and a low cost, which makes it easy to implement.

[Brief description of drawings]

1 to 3 show an embodiment of a speaker system for bass reproduction according to the present invention, FIG. 1 is a sectional view, and FIGS. 2 and 3 are sectional views showing other embodiments of the present invention. is there. FIG. 4 is a sectional view showing a conventional embodiment. Explanation of main symbols 1: Speaker enclosure 2: Speaker unit 3: Acoustic tube 4: Partition plate 5: Vacancy 6: Port 8: Opening

Claims (2)

[Claims] 1. A speaker system for low-pitched sound reproduction, comprising a sound tube formed continuously from the back surface of a speaker unit, an empty room provided on the front surface of the speaker unit, and a bass reflex port provided in the empty room. A bass reproduction speaker system, characterized in that the opening of the acoustic tube is connected to a vacant chamber. 2. The bass reproduction speaker system according to claim 1, wherein the resonance frequency of the port of the bass reflex and the frequency of the half-wave on the acoustic tube are substantially the same.