JPH10285677A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker device with the excellent reproduction efficiency of low-frequency sound regardless of being convenient for carrying. SOLUTION: A speaker 1 is fixed to a container connector 2 and a damper 3 is adhered to the lower surface of the container connector 2. When this speaker device is mounted on a container 4, the lower surface of the damper 3 and the port edge 41 of the container 4 are tightly adhered and freely detachably fixed. Thus, since the container connector and the container 4 constitute a tightly sealed baffle, the speaker device efficiently reproduces the low-frequency sound. For the container, a dust box or a can or the like, for instance, is sufficient and it is sufficient to obtain it in a place to use it. After use, only the speaker device is detached and carried.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device for converting a sound electric signal into sound, and more particularly to a loudspeaker device which has a small size and is convenient for carrying and the like, but has a good efficiency of bass reproduction. About.

[0002]

2. Description of the Related Art Among loudspeaker devices which convert an input audio electric signal into an output sound pressure, those which directly use a radiating speaker include an open-back type, a rear-side closed with a large-capacity box, and a rear-side. There are three types, which are sealed in small capacity boxes. The open-back type uses a so-called flat plate baffle, in which a hole is formed in a wide flat plate and has a size substantially the same as the diaphragm of the direct-radiation speaker, and the direct-radiation speaker is mounted here. This flat plate baffle needs at least a half wavelength of the frequency to be reproduced in order to obtain the effect of the baffle which blocks the flow of sound before and after the diaphragm. For example, in order to reproduce a frequency of 100 Hz, It is well known that a baffle surface having a length of about 3 m is required. Is a large-capacity closed baffle in which a speaker is mounted in a box having a closed rear surface. If the box is sized appropriately and the box plate is made of a material that is heavy and does not vibrate, it will have the effect of baffles over all frequencies. When the capacity is reduced, the efficiency of reproducing low-frequency sound relatively decreases as the capacity is reduced. There is a relationship between the capacity and the reproduction efficiency (the relationship between the input power and the reproduction sound pressure) that when the capacity is reduced to half, the efficiency is reduced to almost half.

[0003]

Some of such speaker devices are portable. Considering the size and weight, it is obvious that a flat plate baffle or a large-capacity closed baffle is not suitable for carrying. Therefore, a small-capacity closed baffle type is used for portable use. However, as described above, the low-frequency reproduction efficiency decreases as the capacity decreases, so that low sound is not sacrificed for portable convenience. Did not get.

Accordingly, an object of the present invention is to provide a speaker device which is excellent in portability and has good low-frequency reproduction efficiency. It is another object of the present invention to provide a speaker device with higher fidelity.

[0005]

According to the first aspect of the present invention, there is provided a direct radiating loudspeaker having a substantially flat back surface and substantially the same size as a diaphragm of the direct radiating loudspeaker. A hole is provided, the direct radiating speaker is fixed so as to close the hole, and the substantially flat back surface around the hole is detachably and substantially adhered to the rim of a suitable container, whereby the container And a container connector constituting a closed baffle, to constitute a speaker device.

According to the first aspect of the present invention, if the substantially flat back surface of the container connector to which the direct radiating speaker is fixed is brought into close contact with the rim of an appropriate container, a capacity excellent in low-frequency reproduction efficiency can be obtained. A closed baffle type speaker having a large size can be constructed. Since the container connector can be detached from the rim of the container, only the container connector and the direct radiating speaker can be carried, and the container connector can be used in close contact with an appropriate container existing in a place where sound is desired to be reproduced. A suitable container is
For example, a trash can, a bucket, a large can, a jar, a pan, etc., which can be easily obtained around the user, is sufficient, and has a suitable capacity and rigidity, and preferably has no unevenness on the rim. As a means for bringing the back surface of the container connector into close contact with the edge of the container, for example, a simple elastic rubber or a hard sponge may be interposed, or a holder for mechanically holding the container may be attached to the speaker device. Or the like.

According to a second aspect of the present invention, in the loudspeaker apparatus according to the first aspect, the container connector includes vibration damping means for blocking propagation of vibration from the direct radiation speaker to the container. Configured.

According to the second aspect of the invention, the vibration of the direct radiating speaker is not transmitted to the container by the vibration damping means provided in the container connector. This can prevent noise from being generated due to vibration from the contact portion between the container connector and the container, and prevent the container from vibrating and adversely affecting the regeneration efficiency. As the vibration damping means, for example, an elastic substance, for example, rubber, sponge, or the like may be disposed as a vibration absorbing material in a portion in close contact with the container.

According to a third aspect of the present invention, there is provided a sound for outputting a low-frequency emphasized sound signal in which a low-frequency component of a sound signal input from the outside to drive the direct radiation speaker is output to the direct radiation speaker. The speaker device according to claim 1 includes signal processing means.

According to the third aspect of the present invention, the electric signal for driving the direct radiating speaker is a low-frequency emphasized audio signal input to the direct radiating speaker via the audio signal processing means. That is, for example, an audio signal input through a cable from an amplifier or the like is processed by an audio signal processing unit into a low-frequency emphasized audio signal in which a low-frequency component is relatively emphasized compared to a high-frequency component. With this low-frequency emphasized audio signal, the low-frequency reproduction efficiency can be further improved.

According to a fourth aspect of the present invention, the audio signal processing means separates the high-frequency emphasized audio signal, in which a frequency component higher than the middle of the audio signal is emphasized, separately from the low-frequency emphasized audio signal. The speaker device according to claim 3, wherein the speaker device includes a direct-radiation speaker for middle and high-frequency sounds, which is separately output and receives the mid-high range emphasis signal and has a diaphragm smaller than the direct-radiation speaker.

According to the fourth aspect of the present invention, in addition to the direct radiating speaker fixed to the container connector, the loudspeaker device has a smaller diaphragm and is suitable for reproducing a middle and high frequency sound. In the direct radiating speaker for middle and high frequency range, the audio signal processing means emphasizes the frequency components of the higher frequency in the audio signal than the low frequency components. The emphasized audio signal is separately input. This makes it possible to realize a speaker device with higher fidelity of sound reproduction, and also saves power because low-frequency components that cannot be reproduced by the direct-radiation speaker for middle and high sounds are not emphasized.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

[First Embodiment] FIG. 1 is a partially cutaway front view schematically showing a first embodiment of a speaker device according to the present invention. In FIG. 1, a speaker 1 is a commercially available direct radiation speaker, and is driven by externally inputting an audio signal through a terminal (not shown). That is, sound is emitted by vibrating the cone-shaped diaphragm 11 according to the sound signal. Diaphragm 11 is circular in plan view.

The speaker 1 is fixed inside a container connector 2 having an upper surface opening 21 and a lower surface opening 22 on the upper surface and the lower surface, respectively. The container connector 2 is, like a top hat, formed from a cylindrical lower end with a disc-shaped flange 23 in plan view.
Has a shape projecting outward in the horizontal direction, and an upper surface opening 21 provided on the cylindrical upper surface and a lower surface opening 22 provided on the lower surface can protect the speaker 1 inside and provide sound. Protective cloth 2 so that it does not prevent
Nos. 4 and 25 are stretched to close the respective openings. The lower surface of the flange 23 constituting the lower surface of the container connector 2 is flat. A cable for inputting an audio signal to the speaker 1 is guided to the outside from the upper surface of the container connector 2 (not shown).

On the flat lower surface (back surface) of the flange 23 of the container connector 2, a flat arc-shaped vibration damper 3 is adhered and fixed on the upper surface. The vibration damper 3 substantially covers the lower surface of the flange 23 over the entire disk shape. The vibration damper 3 is made of elastic rubber.

FIG. 2 is a partially cutaway front view showing the use state of the embodiment of FIG. As shown in FIG. 2, the speaker device of FIG. 1 is mounted on a container 4. The cylindrical container 4 is an ordinary plastic garbage bin, and is in contact with the lower surface of the vibration damper 3 at an edge 41 having no irregularities. Since the vibration damper 3 is made of rubber and the diameter of the rim 41 is substantially equal to the diameter of the flange 23 of the container connector 2, the contact portion is in a close contact state over the entire periphery of the rim 41. .

In this state, when an audio signal is input to the speaker 1 and the diaphragm 11 vibrates, sound pressure is released through the upper opening 21 and the lower opening 22. The input audio signal is a signal having a power large enough to drive the speaker 1, and is supplied from a speaker output of an amplifier of a sound reproduction system such as a so-called stereo. At this time, the sound pressure emitted from the lower opening 22 is blocked from the sound pressure emitted from the upper opening 21 because the flange 23 of the container connector 2 and the container 4 are in close contact with each other. That is, the flange 23 and the container 4 constitute a closed baffle. Therefore, if the capacity of the container 4 is appropriately large, bass can be sufficiently reproduced without neutralization of sound pressure. This speaker device is similar to a normal speaker device.
No power is required other than audio signals. In addition, since the vibration damper 3 is made of elastic rubber, vibration is transmitted to the contact portion between the vibration damper 3 and the edge of the container 4, and noise is generated or the container 4 vibrates, thereby deteriorating the effect of the baffle. I do not even do.

In the embodiment shown in FIG. 1, the speaker 1 projects outward from the lip 41 of the container 4. On the contrary, the speaker 1 projects inside the container 4. It may be configured as follows. In other words, referring to the drawings, the posture of FIG. 2 is turned upside down so that the lower surface opening 22 emits sound to the outside and the upper surface opening 21 emits sound to the inside of the container. In this case, the vibration damper 3 is bonded to the opposite surface of the flange 23.

For convenience of description with reference to the drawings, the vertical direction is specified, for example, such that the "back surface" of the container connector 2 is referred to as the "lower surface", but the fixed state of the container connector 2 and the container is maintained. As long as it is, the posture is not an important issue, and it goes without saying that the speaker 1 can be used in a posture lying down so that the diaphragm 11 faces sideways.

Further, even when such a closed baffle is constructed, the bass may be weakened and the fidelity may be reduced. In such a case, by adjusting the impedance of the audio signal via the LC circuit and then inputting the adjusted signal to the speaker, the low frequency component of the audio signal having a low frequency may be emphasized. It is preferable that the impedance can be adjusted from the outside so that the sound quality can be changed depending on the state of the container 4 or the like.

[Second Embodiment] FIG. 3 is a front view showing a speaker device according to a second embodiment of the present invention. In the figure, a speaker 1 (not shown) is built in a container connector 2, and a vibration damper 3 is bonded to the container connector 2. The configuration of the above parts is almost the same as that of the first embodiment.

In the embodiment shown in FIG. 3, an amplifier 5 is built in the container connector 2. The amplifier 5 has
One end of each of a power cable 61, an audio signal cable 62, and connection cables 71 and 81 for middle and high sounds is detachably connected through respective terminals provided outside the container connector 2. The amplifier 5 is connected to the speaker 1 inside the container connector 2 and supplies an electric signal to the speaker 1.

Power cable 61 and audio signal cable 6
The other end of 2 is connected to an audio signal reproducing device 6 such as a CD player, a record player, and a tape recorder. The audio signal cable 62 does not need to be connected to the speaker output of the audio signal reproducing device 6 as in the first embodiment. For example, the audio signal cable 62 is connected to a stereo output terminal or a headphone terminal of a CD player to supply a weak audio signal to the amplifier 5. Supply. This audio signal is a stereo audio signal. The power cable 62 is connected via a transformer 63 inserted into an outlet provided in the audio signal reproducing device 6.
A DC current is supplied to the amplifier 5. The transformer 63 may be plugged into a household power outlet. Note that the power supply to the amplifier 5 may be performed by a method in which a transformer is provided in the amplifier 5 and a plug connected to the amplifier 5 is inserted into an outlet. The property is deteriorated. It is also possible to use only an internal power supply such as a battery, or to use both an external power supply and an internal power supply.

The other ends of the connection cables 71 and 81 for middle and high range are connected to input terminals of speakers 7 and 8 for middle and high range, respectively. The middle and high range speakers 7 and 8 are speakers for reproducing middle and high range sounds.
Because 1 is small and baffles are almost unnecessary,
It is smaller in size and lighter in weight than the speaker device body. In other words, in the second embodiment, the loudspeaker 1 is a low-frequency loudspeaker, that is, a woofer, and the middle and high-frequency loudspeakers 7, 8 are tweeters or squawkers.

The container connector 2 is provided with an adjusting knob 57 for adjusting the volume and the sound quality, and can be operated from the outside (not shown).

FIG. 4 is a circuit block diagram showing a main configuration of the amplifier 5. The amplifier 5 includes a separation circuit 51, a treble amplifier 52, a bass amplifier 53, and an adjustment knob 54.
The separation circuit 51 is a frequency-selective amplifier, and separates the audio signal input from the audio signal cable 61 into a middle / high-frequency emphasized intermediate signal and a low-frequency emphasized intermediate signal, and outputs each separately. The middle-high band emphasized intermediate signal emphasizes a frequency component having a height higher than the middle of the audio signal, and the low band emphasized intermediate signal emphasizes a low frequency component of the audio signal. The frequency boundary between the low band and the mid-high band varies depending on the size of the diaphragm 11 of the speaker 1, for example, 400 to 600 kHz.
And varies depending on the capacity of the container 4, etc.
It is desirable that the adjustment can be made by the adjustment knob 54.

FIG. 5 shows the gain versus frequency characteristic of the separation circuit 51. The high frequency part is a middle-high frequency emphasized intermediate signal, and the low frequency part is a low frequency emphasized intermediate signal. Depending on the performance of the loudspeaker 1 and the capacity of the container 4, in order to obtain an appropriate balance, the lower range, which tends to be weaker, is processed so as to be more emphasized.

The middle / high-frequency emphasized intermediate signal is output to the high-frequency amplifier 52, and the low-frequency emphasized intermediate signal is output to the low-frequency amplifier 53.
Is amplified into an audio signal suitable for driving the audio signal. The mid-high range emphasis signal and the low band emphasis signal thus created are output to the mid-high range speakers 7 and 8 and the speaker 1, respectively, to drive each speaker. The audio signal input to the separation circuit 51 is a stereo audio signal.
In 1, the low-frequency emphasized intermediate signal output to the speaker 1 is converted into a monaural signal, and the middle-high frequency emphasized intermediate signal is separated into left and right stereo signals and amplified separately from the low frequency.
The degree of amplification of the high-frequency amplifier 52 and the low-frequency amplifier 53 can be adjusted by the adjustment knob 54, so that the overall volume can be adjusted.

According to the above-described embodiment, the closed baffle provides good bass reproduction efficiency, and the bass is emphasized even if bass reproduction is insufficient due to the conditions of the container. Thus, a reproduced sound with higher fidelity can be obtained. Further, even when the sound is reproduced by the middle and high frequency speakers 7 and 8, the low-frequency component of the audio signal, which is wasted due to the neutralization of the sound pressure, is not emphasized as compared with the high-frequency component, so that power can be saved. . Further, even if the bass is slightly insufficient, the bass can be compensated by operating the adjustment knob 54 to change the characteristics of the amplifier 5.

[0031]

As described above, according to the loudspeaker device according to the first aspect of the present invention, the loudspeaker device is carried separately from the container, and is brought into close contact with the container at a place where reproduction is desired, thereby achieving excellent bass reproduction efficiency. A closed baffle type speaker having a large capacity can be constructed.

According to the loudspeaker device according to the second aspect of the present invention, noise is generated due to vibration from the contact portion between the container connector and the container by the vibration damping means, or the container is vibrated to reduce the reproduction efficiency. It is possible to prevent adverse effects.

According to the loudspeaker device according to the third aspect of the present invention, the loudspeaker is driven by the low-frequency emphasized audio signal, whereby the low-frequency reproduction efficiency can be further improved.

According to the loudspeaker device according to the fourth aspect of the present invention, the mid-high range emphasized audio signal is separately input to the direct radiating speaker for middle / high range sound. This makes it possible to realize a speaker device with higher fidelity of sound reproduction,
Since the low-frequency components that cannot be reproduced by the direct-radiation speaker for middle and high sounds are not emphasized, power can be saved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of a speaker device according to the present invention.

FIG. 2 is a partially cutaway front view showing a use state of the embodiment of FIG. 1;

FIG. 3 is a schematic front view showing a speaker device according to a second embodiment of the present invention.

FIG. 4 is a circuit block diagram illustrating a main configuration of the amplifier in FIG. 3;

FIG. 5 is a diagram illustrating a gain versus frequency characteristic of the separation circuit in FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 speaker 11 diaphragm 2 container connector 21 upper surface opening 22 lower surface opening 23 flange 24, 25 protective cloth 3 vibration damper 4 container 41 rim

Claims (4)

[Claims] 1. A direct radiating speaker and a hole having substantially the same back surface as the diaphragm of the direct radiating speaker are provided, and the direct radiating speaker is fixed so as to cover the hole. And a container connector that forms a closed baffle with the container by detachably making the substantially flat back surface around the hole substantially removably contact the rim of an appropriate container. 2. The speaker device according to claim 1, wherein the container connector includes a vibration damping unit for blocking propagation of vibration from the direct radiation speaker to the container. 3. An audio signal processing means for outputting, to the direct radiation speaker, a low-frequency emphasized audio signal in which a low-frequency component of an audio signal input from the outside for driving the direct radiation speaker is emphasized. 2. The speaker device according to 1. 4. The audio signal processing means separates and outputs a mid-high range emphasized audio signal in which a component of a frequency higher than the middle of the audio signal is emphasized separately from the low band emphasized audio signal. The speaker device according to claim 3, further comprising: a direct-radiation speaker for middle and high-frequency sounds to which a range emphasis signal is input and which has a diaphragm smaller than the direct-radiation speaker.