JPH01888A - speaker system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a speaker system that has a small box shape and has improved low-frequency characteristics at low cost.

2. Description of the Related Art In recent years, there has been a demand for speaker systems that are compact and have expanded low-frequency characteristics.

Therefore, conventionally, as a means to solve the above-mentioned demand, it has been used in bass reflex type speaker system cars in general.

A conventional bass reflex speaker system will be described below with reference to the drawings.

Conventionally, speaker systems designed to expand low-frequency characteristics generally have a configuration as shown in FIG.

In Fig. 6, 1 is a speaker unit, 2 is a speaker box, and 3 is a port for improving low frequency characteristics provided on the front of the speaker Φ box 2.The operation of the speaker system configured as described above is shown in FIG. This will be explained below using the sound pressure frequency characteristic diagram shown in FIG.

The sound pressure frequency characteristics & (characteristics of the sealed box) of speaker box 2 with speaker unit 1 attached are as follows:
It is mostly determined by the resonant frequency of the unit 1 and the volume of the speaker box, where the same speaker unit.

If you are trying to expand the low-frequency response with the same speaker box, you can install a bow) 3, and the low-frequency sound pressure will be reduced by the back pressure of speaker unit 1 and the cavity resonance generated by the inside of speaker box 2 and port 3. The sound pressure frequency characteristics shown in Figure 8 are the characteristics of a typical bass reflex speaker system that improves the low frequency characteristics by providing port 3. be.

Problems to be Solved by the Invention In the configuration of a speaker system using such a conventional bass reflex method, considering the same reproduction frequency, the speaker box can be made smaller to a typical volume of 1 τ compared to a sealed box. However, in order to further expand the low-frequency response, it is necessary to set the resonant frequency of the speaker unit lower, or increase the resonant frequency of the speaker unit by increasing the volume of the speaker box. However, in order to set the resonant frequency of the speaker unit low, it is necessary to increase the mass of the vibration system, which causes problems such as a decrease in sound pressure and the need to reduce the volume of the speaker box. Increasing the size has the problem of enlarging the shape of the speaker box.

In addition, as a method of expanding the low-frequency response, a system using a back-loading horn 4 as shown in Fig. 7 may be considered, but there are reasons why the manufacturing cost of the box would be high or the box shape would be large. And low prices are a demand of the market in recent years.

This was not satisfactory from the point of view of miniaturization.

The present invention is intended to solve these problems, and aims to provide a speaker system with an expanded low-frequency response using a small speaker box at a low cost.

Means for Solving the Problem In order to solve this problem, the present invention provides a speaker unit provided on the front panel plate of the speaker box, and a first lower plate provided on one surface constituting the speaker box. A speaker system is constituted by a port for expanding low frequency characteristics, and a second port for expanding low frequency characteristics provided on the back panel of the box on the opposite side of the baffle plate to which the speaker unit is attached, and Two port shapes are configured so that the cavity resonance frequencies of the expansion port and the second low-frequency characteristic expansion port are different.

Effect: With this configuration, the back pressure of the speaker unit causes the inside of the box and the first. The low frequency characteristic can be expanded by the cavity resonance generated in the second low frequency characteristic expansion port, and the cavity resonance frequencies of the first and second low frequency characteristic expansion ports are configured to be different. This makes it possible to improve a wide range of low-frequency characteristics compared to conventional bass reflex speaker systems. Furthermore, by setting the cavity resonance frequency of the second low-frequency characteristic expansion port to be lower than the cavity resonance frequency of the first low-frequency characteristic expansion port, the speaker system of the present invention can be installed in a listening room. When evaluated in the listening condition, only the low frequency band emitted from the second low frequency expansion port provided on the back panel of the box increases due to the double radiation efficiency of the listening room wall, making it an inexpensive small speaker system. This makes it possible to obtain a spacious and rich bass sound without disturbing the sound image localization in the mid-to-high range.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Note that the same reference numerals as those in FIGS. 6 and 7 indicate the same parts.

FIG. 1 is a sectional view showing the configuration of a speaker system according to an embodiment of the present invention. In FIG. 6 is a first low-frequency characteristic expansion port, and 6 is a second port provided on the box back plate whose cavity resonance frequency is set lower than the cavity resonance frequency of the first low-frequency characteristic expansion port 5. be.

The operation of the speaker system configured as described above will be explained below.

As shown in FIG. 2, the sound pressure frequency characteristic C of the speaker system of the present invention is C1 obtained by the cavity resonance of the first low-frequency characteristic expansion port 6, and the second low-frequency characteristic expansion port 6. It is obtained by combining with C2 obtained by the cavity resonance of No. 6, and the low-frequency characteristics can be significantly expanded compared to the sound pressure frequency characteristic diagram of a sealed box with the same volume.

As shown in Figure 3, when the speaker system of the present invention is installed in a listening room and evaluated in a trial listening state,
Generally speaking, a speaker system is installed in a corner of a room or near a wall, so the sound radiated from the front of the speaker system and the second low-frequency characteristic expansion port provided on the back panel of the speaker box 2 are The synthesized sound with the sound e emitted from 6 will be listened to as a sound. Here, only the low frequency band of the sound e radiated from the back of the box is expanded due to the effect (double radiation efficiency) of the walls 7 and floor 8 of the room, and as shown in the sound pressure frequency characteristic of Fig. 4, Compared to the anechoic chamber characteristic C of the speaker system of the present invention, the sound pressure frequency characteristic f when installed in a listening room makes it possible to further expand the sense of low pitch.

In addition, in one embodiment, the cavity resonance frequency of the second low-frequency characteristic expansion port was set lower than the cavity resonance frequency of the first low-frequency characteristic expansion port, but depending on the shape of the listening room and the hiss beaker. The cavity resonant frequency of the port may be selected in consideration of the installation condition of the system. It is also possible to regulate the pressure.

Effects of the Invention As described above, according to the present invention, the speaker double unit provided on the front baffle plate of the speaker box, and the first low frequency characteristic expansion port provided on one surface constituting the speaker box. and a second low-frequency characteristic expansion port provided on the box back plate on the opposite side of the baffle plate to which the speaker unit is attached, and a speaker system is configured from the first low-frequency characteristic expansion port and the second low-frequency characteristic expansion port. By configuring the two port shapes so that the cavity resonance frequencies of the two low-frequency characteristic expansion ports are different, it is possible to improve a wide range of low-frequency characteristics by the different cavity resonances that occur in the two ports. Furthermore, when installed in a listening room, the low-frequency sound emitted from the second port on the back panel of the box increases due to the double radiation efficiency of the wall, so an inexpensive small speaker system can spread the sound. The effect is that a certain rich bass can be reproduced without disturbing the sense of localization of the sound image in the middle and high ranges.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a speaker system according to an embodiment of the present invention, FIG. 2 is a sound pressure frequency characteristic diagram of the speaker system of the present invention shown in FIG. 1
4 is a schematic diagram showing the speaker system of the present invention shown in FIG. 3 installed in a listening room. Characteristics, Fig. 6 is a perspective view showing the configuration of a conventional bass reflex speaker system, Fig. 6 is a sound pressure frequency characteristic diagram of the conventional speaker system shown in Fig. 6, and Fig. 7 is a conventional FIG. 2 is a perspective view showing the configuration of a backload type horn system. 1...Speaker Φ unit, 2...Speaker box, 6...First low frequency characteristic expansion port, 6...Second low frequency characteristic expansion port for 7
...listening room wall, 8...listening room floor. Name of agent: Patent attorney Toshio Nakao and 1 other person f-
Speaker unit 2 - Subi-kari hox S-@/'s range special/Sho-o wide dog white g---2nd figure 1 figure 5 figure 6 figure C'J Mound

Claims (3)

[Claims] (1) A speaker unit provided on the front baffle plate of the speaker box, a first low-frequency characteristic expansion port provided on one surface of the speaker box, and a baffle to which the speaker unit is attached. A speaker system comprising a board and a second low-frequency characteristic expansion port provided on the rear panel of the box on the opposite side. (2) The speaker according to claim 1, characterized in that the first low-frequency characteristic expansion port and the second low-frequency characteristic expansion port are configured to have different cavity resonance frequencies.
system. (3) A first low-frequency characteristic expansion port is provided on the front baffle plate to which the speaker unit is attached, and the cavity resonance frequency of the second low-frequency characteristic expansion port is set to the first low-frequency characteristic expansion port. 2. The speaker system according to claim 1, wherein the speaker system is set lower than the cavity resonance frequency of the port.