JPH03145896A - Low-pitched sound reproducing device - Google Patents

Abstract

PURPOSE:To make the reproduction limit frequency lower by providing a sound wave radiation window to a cabinet separately from a speaker so as to pass a sound wave radiating from a sound wave radiation window through an acoustic filter. CONSTITUTION:The reproduction limit frequency of a sound radiating from a speaker 15 and a sound wave radiation window 17 is lower than a reproduction limit frequency of a low sound reproduction device using a closed cabinet of the same volume by the action of a sound wave radiation window 17. That is, a synthesized sound pressure between a sound pressure from a front face of the speaker 15 and a sound pressure from a front face of the sound wave radiation window 17 enters an acoustic filter 12. Thus, the low frequency reproduction limit frequency is decreased up to fL2. Thus, the reproduction limit frequency is decreased by 1/sq. rt. 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio reproducing device, and particularly to a bass reproducing device that can effectively reproduce bass frequencies.

[Conventional Extraction Procedure] FIG. 3 is a plan sectional view of a conventional bass reproducing device. The bass reproduction device includes a cabinet 1, an acoustic filter 2, and a speaker 5.

Cabinet 1 is a closed cabinet.

An opening is provided in one of the side walls constituting the cabinet 1, and a speaker 5 is attached to the opening.

The acoustic filter 2 is attached to the side wall of the cabinet 1 on which the speaker 5 is attached. The acoustic filter 2 consists of a sheath 3 and a duct 4. An opening is provided in one of the side walls constituting the sheath 3, and the duct 4 is fitted into the opening. What is the sheath part 3 and the duct 4?
The interiors of both are empty.

In such a conventional bass reproduction device, the resonance frequency of the acoustic filter 2 is designed to be lower than the reproduction limit frequency of the sound emitted from the speaker 5.
Among the sounds emitted from the duct 4, the sound pressure level near the resonance frequency is increased by resonance, and as a result, the low frequency range of the sounds emitted from the duct 4 is emphasized.

[Problems to be Solved by the Invention] Incidentally, in the conventional bass reproducing device having the above configuration, the reproduction limit frequency is determined by the reproduction limit frequency of the sealed cabinet 1.

In other words, if the frequency characteristics of the closed cabinet 1 are designed to have the most favorable characteristics, the acoustic filter 2
The reproduction limit frequency of the bass reproduction device without installing is 110H.
z, the effective reproduction limit frequency of the bass reproduction device equipped with the acoustic filter 2 was approximately 100 Hz (see fL++ characteristics ■ in Fig. 2).

Therefore, it has been difficult to effectively reproduce frequencies lower than the reproduction limit frequency of 100 Hz determined based on the characteristics of the cabinet 1.

Therefore, the present invention has been made to solve these problems. An object of the present invention is to provide a bass reproduction device that can lower the reproduction limit frequency.

[Means for Solving the Problems] A bass reproduction device according to the present invention has a sound wave emitting port provided in the cabinet separately from the speaker, and emits sound waves from the sound wave emitting port,
The acoustic filter is characterized in that the sound waves generated by the noise are also passed through the acoustic filter.

[Function] The bass reproduction device according to the present invention has a sound wave emission port provided in the cabinet. Therefore, the reproduction limit frequency can be lowered compared to a bass reproduction device using a closed cabinet of the same volume. Therefore, the bass reproducing apparatus according to the present invention can effectively reproduce a frequency range in which conventional bass reproducing apparatuses cannot effectively reproduce even when using an acoustic filter.

[Example] An embodiment of a bass reproduction device according to the present invention will be described.

FIG. 1 is a sectional plan view of a bass reproduction device according to the present invention. The bass reproduction device includes a cabinet 11, an acoustic filter 12, and a speaker 15.

An opening and a duct 16 are provided in one of the side walls constituting the cabinet 11. A speaker 15 is attached to the opening. One end of the duct 16 is inside the cabinet 11, and the other end is fitted into the side wall of the cabinet 11. The other end of the duct 16 serves as a sound wave emission port 17, and the cabinet 11
is of the so-called phase inversion type.

The acoustic filter 12 is attached to a side wall of the cabinet 11 on which the speaker 15 and the duct 16 are attached. The acoustic filter 12 consists of a sheath 13 and a duct 14. An opening is provided in one of the side walls constituting the sheath 13, and one end of the duct 14 is fitted into the opening. The other end of the duct 14 is connected to the sheath 1
It is outside of 3. Both the sheath portion 13 and the duct 14 are hollow inside.

Since the bass reproduction device according to the present invention is configured as described above, the reproduction limit frequency of the sound radiated from the speaker 15 and the sound wave emitting port 17 is determined by the effect of the sound wave emitting port 17 in the same volume. The frequency is lower than the reproduction limit frequency of a bass reproduction device using a shaped cabinet.

In other words, the composite sound pressure of the sound pressure from the front of the speaker 15 and the sound pressure from the front of the sound wave emission port 17 is applied to the acoustic filter 12. In addition, the reproduction limit frequency in the low range can be lowered to fl2. Characteristic (2) is that of a conventional bass reproduction device using a closed cabinet.

Furthermore, if the reproduction limit frequency when using a closed cabinet is fl, and the reproduction limit frequency when using a phase inversion type cabinet throat is f2, then when using a cabinet with the same volume, f2-1/J f, up to f
It is known that it is possible to lower the number of
．． 15 first edition, Chapter 8 Cabinet p269).

Therefore, the reproduction limit frequency can be lowered by 1/# compared to the case where a closed cabinet with the same volume is used.

In this embodiment, a phase inversion type cabinet was used as the cabinet. However, the present invention is not limited to this, and a passive radiator type cabinet, which is a variation of the phase inversion type cabinet, may be used.

Further, in this embodiment, the sound waves emitted from the speaker and the sound waves emitted from the g-wave radiation port 11-1 are made to pass through the same g-sound filter.

However, the present invention is not limited to this, and the acoustic filter through which the sound waves emitted from the speaker passes and the acoustic filter through which the sound waves emitted from the sound wave emission port pass may be provided independently. .

[Effects] The low playback device according to the present invention has a sound wave emitting port provided in the cabinet in addition to the speaker. Therefore, even if the cabinet size is the same as that of a conventional bass reproduction device using a closed cabinet, the reproduced optical frequency can be lowered.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of an embodiment of a bass reproduction device according to the present invention. FIG. 2 is a diagram illustrating a graph showing the relationship between frequency and sound pressure phase χ·lever of a conventional bass reproduction device and an embodiment of the bass reproduction device according to the present invention. FIG. 3 is a plan sectional view of a conventional bass reproduction device. In the figure, 11 is a cabinet, 12 is an acoustic filter, 15 is a speaker, and 17 is a sound wave emission port. Sound figure 2 figure 3

Claims (1)

[Scope of Claims] A bass reproduction device including a cabinet in which a speaker is installed and an acoustic filter that selectively passes a low frequency range of sound waves emitted from the speaker, wherein the speaker is installed in the cabinet. A bass reproduction device, characterized in that a sound wave emitting port is separately provided, and the sound wave emitted from the sound wave emitting port also passes through the acoustic filter.