JP3521641B2 - Speaker system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system used as an indoor / outdoor sound reproducing device.

[0002]

2. Description of the Related Art In recent years, in order to obtain a wide sound field in the reproduced sound of a speaker system, some systems using an omnidirectional system and some systems using indirect sound using a large number of speaker units have been proposed. There is. An example of the conventional speaker system described above will be described below with reference to the drawings. FIG. 5 shows a speaker system with a conventional omnidirectional speaker unit. In FIG. 5, the main speaker unit 11 is attached to the front surface of the speaker box 13, and the speaker unit 12 having no directivity in the peripheral direction (in the horizontal plane) is attached to the top surface of the speaker box 13.

FIG. 6 shows an example of the output sound pressure frequency characteristics on the axis of the main speaker 11 of the speaker system of FIG. 5, in which the thin line 6a shows the characteristics when only the main speaker unit 11 is operated, and the thick line 6b shows. This is a characteristic when both the main speaker unit 11 and the omnidirectional speaker unit 12 are operated.

[0004]

As described above, in the conventional speaker system with the omnidirectional type unit, the disturbance of the frequency characteristic due to the interference of the radiated sound from both units as shown in 6b of FIG. Indirect sound (reflected sound) due to overlapping outputs from a wide frequency band
Affects the fundamental frequencies of voices and musical instruments,
There is a problem in that the sound image and the voice are disturbed, and the sound image has a sense of spread, but the texture of the voice and the localization of the sound image are impaired.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a speaker system which reproduces a wide sound field without impairing the texture of the voice or the localization of the sound image.

[0006]

In order to solve the above-mentioned problems, the speaker system of the present invention has a sub-speaker directed toward the outside of the directivity region of the main speaker unit only in the frequency band where the directivity of the main speaker unit becomes sharp. The sub-speaker unit is structurally arranged in front of the speaker box above the main speaker unit, and the sub-speaker unit is configured to widen the overall directivity by performing diffused radiation by the unit.
The radiation axis of the knit is the same as that of the main speaker unit.
A structure is used in which the diffuser diffusers that are arranged in the same direction and diffused and radiated in the left and right directions are provided on the front surface. The emission band of the sub-speaker unit is ω is an angular frequency, c is a sound velocity, k Is a phase constant = ω / c, and a is an effective radius of the vibration system of the main speaker unit, and ka> 1.
Can be defined as

According to the present invention, the interference of radiation sound from both the main and sub speaker units is reduced by the above configuration, and the high frequency band component of the sub speaker unit is suppressed without impairing the texture of the voice and the localization of the sound image due to the indirect sound. The diffuse radiation can broaden the directivity of the overall high range.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention of the speaker system according to claim 1 of the present invention is directed to the front of the speaker box toward the outside of the directivity region of the main speaker unit only in the frequency band where the directivity of the main speaker unit becomes sharp.
In the same direction as the emission axis of the main speaker unit
The sub-speaker units arranged in this way spread the diffused radiation to broaden the overall directivity. With this configuration, the sub-speakers widen the directivity in the sharp directivity band of the main speaker unit, and The output of the speaker unit and the sub-speaker unit do not interfere with each other.

According to a second aspect of the invention of the speaker system of the present invention, in the first aspect of the invention, the sub-speaker unit is arranged above the main speaker unit on the front surface of the speaker box, and diffused in the left-right direction and in the upward direction. The diffuser is provided on the front surface, and acts to add diffused radiation of the sub speaker unit to the left and right directions and the upward direction where the radiation of the main speaker unit is weakened in the frequency band where the directivity of the main speaker is narrowed.

According to a third aspect of the present invention, in the speaker system of the first aspect, the radiation band of the sub-speaker unit is such that ω is an angular frequency, c is a sound velocity, and k is a phase constant = ω / c, a. Is set as the effective radius of the vibration system of the main speaker unit, and the frequency band of ka> 1 is set, and the radiation band of the sub speaker unit is set to be equal to or higher than the frequency satisfying this condition, and the directivity of the main speaker unit becomes sharp. The directivity of the sub speaker unit is widened, and the outputs of the main speaker unit and the sub speaker unit do not interfere with each other.

Embodiments of a speaker system of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a structure of a speaker system according to an embodiment of the present invention. FIG. 1 is a front view thereof, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. FIG. 1 to 3, the speaker box 3
In order from the bottom, the main speaker unit for low range 1a,
High frequency speaker unit 1b, sub speaker unit 1
c is attached, a diffuser 2 is provided on the front surface of the sub speaker unit 1c, and a high pass filter 4 is connected in series to the input terminal of the sub speaker unit 1c. This high-pass filter 4 has ka =
A signal is input to the sub speaker unit 1c by using the circuit constant of 1. Here, k is the phase constant = ω / c, ω is the angular frequency, c is the speed of sound, and a is the main speaker unit 1 for the low frequency range.
It is the effective radius of the vibration system a. Since the directivity of the low-frequency main speaker 1 becomes sharper at frequencies where ka is greater than 1, the low-frequency main speaker 1 is cut at or below this frequency and given to the sub-speaker unit 1c. It is intended to minimize the interference between the unit 1a and the sub speaker unit 1c.

The low-frequency main speaker unit 1a has a diameter of 14 cm, and the high-frequency speaker unit 1b has a diameter of 6 cm.
The sub speaker unit 1c has a diameter of 6
The cutoff frequency in cm was 1800 Hz. The shape of the diffuser 2 has a horizontal opening angle of 122 degrees and an upward opening angle of 22.6 degrees, and is installed in front of the sub speaker unit 1c at a distance of 4.4 mm to radiate the sub speaker unit 1c. It is possible to prevent the interference in the frequency band in which the emission bands of the sub speaker unit 1c and the low frequency main speaker unit 1a and the high frequency speaker system 1b overlap with each other by directing the area outside the directional area of the main speaker unit 1a. Since the high-frequency speaker unit 1b has a higher cutoff frequency and originally has a sharp directivity, interference can be sufficiently prevented with such a configuration.

As described above, the interference due to the radiated sound from the low-frequency main speaker unit 1a and the sub-speaker unit 1c is reduced, and the high-frequency radiated sound of the sub-speaker unit 1c can be diffused by the diffuser. In the band where the directivity of 1a becomes sharp, the high range outside the directivity range of the low-frequency main speaker unit 1a is supplemented, so that the directivity of the system can be expanded.

FIG. 4 shows output sound pressure frequency characteristics in this state. In the figure, 5a is the distance 1 on the main speaker axis for low frequencies
Output sound pressure frequency characteristics at m, 5b is output sound pressure frequency characteristics at a distance of 2 m in the direction of 60 degrees to the right from the low frequency main speaker axis, and 5c is the low frequency main speaker axis when the sub speaker unit 1c is not provided. This is the output sound pressure frequency characteristic at a distance of 2 m in the direction of 60 degrees to the right from above, and the effect of the sub speaker unit 1c and the diff user 2 is clearly seen in the comparison between the characteristics 5b and 5c. Can realize wide directivity in a frequency band higher than the frequency where the output sound pressure frequency characteristic of the speaker system is less disturbed and the directivity of the main speaker unit is narrowed.

In the above embodiment, the high pass filter 4 cuts the low frequency range of the sub speaker unit 1c. However, the low frequency range is cut by the sub speaker unit 1c itself, the diffuser 2 or other acoustic engineering effect. It does not matter if it is configured. Further, in the present embodiment, the speaker system in which the sub speaker unit is added to the so-called two-way speaker system using the low-frequency main speaker unit and the high-frequency speaker unit has been exemplified, but a one-way or three-way speaker system is exemplified. Can be applied to
In the three-way speaker system, the main speaker unit including the mid-range speaker unit is radiated only above the cutoff frequency at which the directivity of the main speaker unit becomes narrow, and diffused emission is carried out toward the outside of the directional region of the main speaker unit. A configuration that widens the overall directivity by arranging the sub-speaker unit is also included in the scope of the present invention.

[0016]

As described above, according to the speaker system of the present invention, the front side of the speaker box is directed toward the outside of the directivity region of the main speaker unit only in the frequency band where the directivity of the main speaker unit becomes sharp .
Align with the emission axis of the main speaker unit
Since the sub-speaker unit placed in the main unit is configured to widen the overall directivity by performing diffused radiation, interference of the radiated sound from both the main and sub speaker units is reduced, and the texture and sound image of the voice are generated by the indirect sound. The diffused radiation of the high frequency band component expands the directivity of the high frequency band without damaging the sense of localization, and can reproduce a wide sound field.

[Brief description of drawings]

FIG. 1 is a front view showing a structure of a speaker system according to an embodiment of the present invention.

2 is a sectional view taken along line AA in FIG.

3 is a sectional view taken along line BB in FIG.

FIG. 4 is a characteristic diagram of output sound pressure frequency of the speaker system according to the embodiment of the present invention.

FIG. 5 is an external perspective view of a conventional speaker system.

[Fig. 6] Similarly, the output sound pressure frequency characteristic diagram

[Explanation of symbols]

1 main speaker unit 1a Main speaker unit for low frequency range 1b High frequency speaker unit 1c Sub speaker unit 1d Omnidirectional speaker unit 2 diffuser 3 speaker box 4 high pass filter

Continuation of front page (56) Bibliography Sho 57-143781 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04R 1/26 H04R 1/34 310

Claims (2)

(57) [Claims] 1. A front surface of a speaker box is directed toward the outside of a directivity region of the main speaker unit only in a frequency band where the directivity of the main speaker unit becomes sharp.
In the same direction as the emission axis of the main speaker unit
A speaker system characterized by being configured so as to broaden the overall directivity by performing diffused radiation by the sub-speaker units arranged as described above . Wherein the front surface of the sub-speaker unit, the diffusing diffuser that diffuses emitted in the horizontal direction and upward direction
The speaker system according to claim 1, further comprising: a speaker system.