JP3580703B2 - Loudspeaker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a so-called speaker-equipped loudspeaker having a built-in speaker, such as a portable wireless amplifier used for a conference or a lecture, etc., and particularly to an external speaker in addition to the built-in speaker. A loudspeaker that can be used.
[0002]
[Prior art]
Such a loudspeaker is generally used in a relatively large space such as a conference room, an auditorium, or a plaza. When such a loudspeaker is used, for example, placed on the floor or the ground, the position of the loudspeaker is lowered. When the loudspeaker sound of the loudspeaker propagates in the space to be loudspeaked, the loudspeaker is present in that space. A person (for example, an audience) or an object becomes an obstacle. Therefore, there is a problem that it is difficult for the loud sound to reach a distant place due to the influence of the reflection and absorption by these obstacles.
[0003]
In order to improve such inconvenience, conventionally, for example, as shown in FIG. 4, separately from the built-in speaker 11 of the loudspeaker 1, a position higher than the speaker 11, for example, about 1.5 m to 2 m from the floor or the ground. An external external speaker 102 is provided at the position, and the sound is louder from this high position, thereby reducing the influence of the above-mentioned obstacles such as reflection and absorption. In order to realize this, it is needless to say that the loudspeaker 1 is provided with an audio output terminal (not shown) for outputting a sound (audio) signal reproduced therein to the outside. Only when the audio output terminal of the loudspeaker 1 and the audio input terminal (not shown) of the external speaker 102 are connected by the speaker cable 3, a sound corresponding to the sound signal is amplified from the external speaker 102. . As a means for installing the external speaker 102 at a high position as described above, a speaker stand 104 having a configuration different from that of the loudspeaker 1 and the external speaker 102 is usually used.
[0004]
The configuration shown in FIG. 4 has the following disadvantages. That is, in the loudspeaker 1 to which the external speaker 102 can be added as described above, most of the loudspeakers 1 are connected to the built-in speaker 11 and the external speaker 11 by, for example, switching operation of a not-shown switch provided on the operation panel 12. It is configured such that it is possible to select whether to make both the speaker 102 and the speaker 102 or only the external speaker 102 to make the speaker sound louder. Here, for example, it is assumed that the sound is louder from both the built-in speaker 11 and the external speaker 102 by the changeover switch. In this case, the loud sounds of the speakers 11 and 102 interfere with each other, and the directional characteristics of the speakers 11 and 102 change, or the reproduction frequency characteristics of the speakers 11 and 102 are synthesized. There is a problem that the reproduction frequency characteristics of the entire configuration of No. 4 have irregularities. In particular, when the unevenness of the characteristic occurs in a middle and high tone range that greatly affects the clarity of human hearing, for example, in a frequency band of 500 Hz or more, the clarity is significantly impaired.
[0005]
On the other hand, if the changeover switch is set so that only the external speaker 102 is louder, the above-described problem of interference does not occur. However, in this state, if an attempt is made to obtain good sound quality, for example, sound quality at least equal to the loud sound of the built-in speaker 11 on the loudspeaker 1 side, the performance of the external speaker 102 is equal to or higher than that of the built-in speaker 11. It is necessary to use a speaker having Therefore, when the built-in speaker 111 of the loudspeaker 1 is of a so-called full-band (full-range) type capable of reproducing from a low-frequency range to a high-frequency range, for example, it is necessary to use a full-band type as the external speaker 102. is there. In this case, there is a problem that the size of the external speaker 102 itself becomes large and expensive, and that the speaker stand 104 supporting the external speaker needs to be relatively strong. In the case where the loudspeaker 1 is of a so-called two-way type that includes, in addition to the built-in speaker 11 and a speaker 13 for reproducing a high frequency range, as shown in FIG. The above problem becomes more remarkable because a speaker having a speaker 102a for reproducing a high-frequency range is also required as 102. In general, a cone-shaped speaker unit is used as the above-described full-band speakers 11 and 102, and a horn-shaped speaker unit is used as the speakers 13 and 102a for reproducing the high-frequency range. .
[0006]
[Problems to be solved by the invention]
That is, the problem to be solved by the present invention is that, according to the above-described conventional technology, the loudspeakers of the speakers 11 and 102 interfere with each other, and the directional characteristics of the speakers 11 and 102 change, or This is because irregularities occur in the reproduction frequency characteristic, and the external speaker 102 becomes large.
[0007]
Therefore, the present invention suppresses the interference between the loudspeakers of the external loudspeaker and the internal loudspeaker when the external loudspeaker is used to extend the loudspeaker range, and reduces the size and weight of the external loudspeaker. It is an object of the present invention to provide a loudspeaker capable of realizing.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 of the present invention includes a loudspeaker body including a speaker,
An external speaker provided outside the loudspeaker main body separately from the speaker of the loudspeaker main body and mainly loudspeaking a sound of a predetermined frequency or more, for example, a middle and high range, according to an acoustic signal given from the loudspeaker main body,
Treble suppression means for suppressing the loudspeaker from the speaker of the loudspeaker body from the mid-high range sound,
Support means for supporting the external speaker in a state of being positioned higher than the speaker of the loudspeaker body;
With
The support means is configured to be detachable from the loudspeaker body,
The treble suppression means is an acoustic filter means for acoustically attenuating the mid-high range sound that is loudspeaked from the speaker of the loudspeaker body, and is integrated with the support means. Things.
[0009]
According to the first aspect of the present invention, a mid-high range sound is loudspeaked from the external speaker, and lower than the mid-high range from the speaker of the loudspeaker main body due to the suppression effect of the high range suppression means. Only the so-called low range sound is louder. As described above, since the range of each loudspeaker sound of each speaker is different, these loudspeakers do not interfere with each other. Further, since the external speaker is used for reproducing the middle and high frequency range, it is possible to realize a reduction in size, weight, and cost as compared with the above-described full-band speaker.
[0010]
In general, it is known that mid-high range sounds are easily affected by the above-mentioned obstacles such as reflection and absorption, but low-range sounds are not easily affected by the above-mentioned obstacles such as reflection and absorption. ing. In addition, among the audible frequency bands, the above-mentioned components that largely affect the intelligibility in human perception are mainly the components in the middle and high frequency ranges, and the components in the low frequency range do not significantly affect the intelligibility. It has been known. Therefore, even if the loudspeaker main body is placed on the floor or the ground, the loudspeaker and the external loudspeaker and the external loudspeaker can be provided as long as the small and lightweight external loudspeaker is provided at a position high enough not to be affected by reflection or absorption by the obstacle. High clarity of the loud sound can be obtained even at a place away from the speaker.
[0011]
Therefore, a supporting means for supporting the external speaker at a position higher than the speaker of the loudspeaker body is provided.
[0012]
Then, the support means is detachably configured for loudspeaker body.
[0013]
Furthermore, the high-frequency suppression means, an acoustic filter means for acoustically attenuating the treble sound in that will be loud speaker of the loudspeaker body are integral with said support means. Note that the acoustic filter means here means, on the front of the speaker of the loudspeaker main body, the middle and high frequency components of the sound emitted from the front of the speaker by, for example, absorbing, diffusing, shielding, or a combination thereof. It has a function of attenuating high frequency components.
[0014]
According to this configuration, when the supporting means is attached to the loudspeaker main body, the position at which the treble suppression means of the acoustic filter means has an effect of attenuating the middle and high frequency components emitted from the front surface of the speaker of the loudspeaker main body. Installed in
[0015]
The invention according to claim 2 is a loudspeaker main body including a speaker,
An external speaker provided outside the loudspeaker main body separately from the speaker of the loudspeaker main body and mainly loudspeaking a sound of a predetermined frequency or more, for example, a middle and high range, according to an acoustic signal given from the loudspeaker main body,
Treble suppression means for suppressing the loudspeaker from the speaker of the loudspeaker body from the mid-high range sound,
Support means for supporting the external speaker in a state of being positioned higher than the speaker of the loudspeaker body;
With
The treble suppression means is an acoustic filter means for acoustically attenuating the mid-high range sound that is loudspeaked from the speaker of the loudspeaker body, and is integrated with the support means. Things.
[0016]
According to a third aspect of the present invention, in the loudspeaker according to the first or second aspect , the external speaker and the supporting means are integrated.
[0017]
According to a fourth aspect of the present invention, in the loudspeaker of the first, second or third aspect of the present invention, a sound having a frequency lower than the predetermined frequency, that is, a sound in a low frequency range is loudspeaked from the external speaker. This is provided with a bass range suppressing means for suppressing the noise.
[0018]
According to a fifth aspect of the present invention, in the loudspeaker according to the first, second, third or fourth aspect , the predetermined frequency is set between 500 Hz and 1 kHz.
[0019]
That is, the value of the predetermined frequency (the lower limit value of the frequency of the sound to be loudspeaked from the external speaker) to be set depends on the clarity of the loudspeaker sound and the degree and cost of miniaturization and weight reduction of the external speaker. Determined by balance. Taking this balance into consideration, setting the predetermined frequency to a value of 500 Hz or more and 1 kHz or less can achieve relatively high clarity, and can realize reduction in size, weight, and cost of the external speaker.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a loudspeaker according to the present invention will be described with reference to FIGS.
[0021]
FIG. 1 is a front external view showing a schematic configuration of the present embodiment. As shown in the figure, the present embodiment is different from the above-described configurations of FIGS. 4 and 5 in that the full-band external speaker 102 and the speaker stand 104 are replaced with an external speaker 2 for middle and high range sound reproduction, For example, a hollow cylindrical support pole 3 that supports the external speaker 2 is provided. Although not shown in the figure, a speaker cable connecting the audio output terminal of the loudspeaker 1 and the audio input terminal of the external speaker 2 is routed through the hollow portion of the support pole 3. Further, an acoustic filter unit 5 described later is connected to a lower side surface of the support pole 3.
[0022]
The external speaker 2 loudspeaks mainly a middle frequency band sound having a predetermined frequency f _C , for example, f _C = 1 kHz or higher. Therefore, compared to the full-band type external speaker 102 in the above-described conventional technique, it can be realized in a small size, light weight, and low cost. In this embodiment, a cone-shaped speaker unit 2a of the external speaker 2 is used.
[0023]
On the other hand, the support pole 3 is made of, for example, a hard resin or a light metal such as aluminum. One end of the support pole 3 is aligned with the bottom surface of the loudspeaker 1 and, for example, the side of the loudspeaker 1 (the right side in the figure). Are provided so as to extend in a substantially vertical direction. The external speaker 2 is fixed to the upper end (i.e., the other end) of the support pole 3. The support pole 3 is configured so that its length dimension can be freely extended and contracted. In this case, the external speaker 2 is located at a position much higher than the built-in speaker 11 on the loudspeaker 1 side, for example, 1.5 m from the floor or the ground. The support pole 3 is extended to a position at a height of about 2 m. The support pole 3 can be arbitrarily attached to and detached from the loudspeaker 1 by coupling means (not shown).
[0024]
The acoustic filter unit 5 acoustically attenuates the middle and high frequency range components of f _C = 1 kHz or higher among the sounds emitted from the built-in speaker 11 of the loudspeaker 1. When mounted on one main body, it is coupled to the support pole 3 so as to exert an attenuating effect on the mid-high range. It is known that among the sounds emitted from the built-in speaker 11, the components in the mid-high range are mainly emitted from near the center of the front surface of the built-in speaker 11. Therefore, in the present embodiment, the acoustic filter section 5 is a plate-shaped body made of, for example, a hard resin or a light metal such as aluminum, and the plate-shaped body covers substantially the center of the front surface of the built-in speaker 11. The sound of the middle and high frequency range components emitted from the built-in speaker 11 is shielded, thereby attenuating the middle and high frequency range components. A sound absorbing material (not shown) for absorbing the sound of the middle and high frequency range components is provided on a surface of the acoustic filter unit 5 facing the built-in speaker 11 side, thereby promoting an attenuation effect on the middle and high frequency range components. I have. Therefore, the built-in speaker 11 of the loudspeaker 1 functions as a speaker for low-frequency range reproduction having a reproduction frequency of 1 kHz or less (strictly less than 1 kHz) due to the attenuation effect of the acoustic filter unit 5.
[0025]
As described above, according to this embodiment, among the sound emitted from the built-in speaker 11 of the loudspeaker 1, for example, as shown in the graph X in FIG. 2 (a), the mainly f _{C =} 1 kHz following Only the sound in the low frequency range is loudspeaked (note that the dotted line portion P in the graph X is the middle and high frequency range component of f _C = 1 kHz or more attenuated by the acoustic filter unit 5). On the other hand, as shown in the graph Y in the figure, sounds in the middle and high frequency range of f _C = 1 kHz or more are mainly loudspeaked from the external speaker 2. As described above, since the loudspeakers of the respective speakers 11 and 2 have different sound ranges, that is, function as a two-way speaker, these loudspeakers do not interfere with each other. Therefore, unlike the above-described conventional technology, the directional characteristics of the speakers 11 and 2 change, or the reproduction frequency characteristics X and Y of the speakers 11 and 2 are combined as shown in FIG. There is no unevenness in the reproduction frequency characteristic Z of the entire configuration shown in FIG.
[0026]
The external speaker 2 which is susceptible to reflection and absorption by obstacles such as a human body and an object, and which loudspeaks the sound in the mid-high range, which greatly affects the clarity of human hearing, is supported by a support pole 3. It is provided at a high position. Accordingly, high clarity of the loudspeaker sound can be obtained even in a place away from the external speaker 2 (loudspeaker 1).
[0027]
Further, since the external speaker 2 is used for reproducing a medium and high frequency range, which is smaller and lighter than the conventional full-band external speaker 102, the support pole 3 supporting the external speaker 2 is the speaker according to the prior art. There is no need for something as sturdy as the stand 104. Accordingly, the weight of the support pole 3 can be reduced, and the support pole 3 does not need to have a complicated structure like the speaker stand 104.
[0028]
Since the support poles 3 are detachable from the loudspeaker 1, when they are carried or stored, they can be transported or stored in a state suitable for each occasion.
[0029]
In the present embodiment, the middle and high range components of the sound emitted from the built-in speaker 11 of the loudspeaker 1 are attenuated by the acoustic shielding function and the absorbing function of the acoustic filter unit 5, but the present invention is not limited to this. Absent. For example, the mid-high range component may be attenuated by one of the above-described shielding function and absorption function, or by an acoustic diffusion function. Further, the middle and high frequency range components may be attenuated by a combination of the respective actions of shielding, absorption, and diffusion. Further, instead of the acoustic filter section 5, for example, a low-frequency pass filter (LPF) circuit may be inserted on the input side of the built-in speaker 11, and this circuit may be turned ON / OFF according to the presence or absence of the external speaker 2. However, according to the method using the low-frequency pass filter circuit, the low-frequency pass filter circuit and a changeover switch for turning on / off the low-frequency pass filter circuit are required, so that the configuration of the loudspeaker 1 is complicated accordingly. At the same time, the cost increases. On the other hand, according to the present embodiment, since the above-mentioned middle and high frequency range components can be attenuated only by attaching the support pole 3 to the loudspeaker 1 main body, it can be easily applied to existing loudspeakers.
[0030]
Further, in the present embodiment, the external speaker 2 and the support pole 3 are configured differently, but these may be integrated, for example, the external speaker 2 may be built in the support pole 3.
[0031]
Further, for example, a low-frequency blocking filter (HPF) circuit for blocking a signal of 1 kHz or less (strictly less than 1 kHz) is provided on the input side of the external speaker 2. A so-called bass range suppression means for suppressing the sound from being amplified may be provided. If the low-frequency range suppression means is provided to completely prevent the low-frequency range sound from being loudspeaked from the external speaker 2, the loudspeakers of the external loudspeaker 2 and the built-in speaker 11 of the loudspeaker 1 will be able to communicate with each other. Interference can be more reliably prevented.
[0032]
When the loudspeaker 1 is of a two-way type including a loudspeaker 13 for high-frequency reproduction in addition to the built-in speaker 11 as shown in FIG. By covering the front surface with an acoustic filter unit 6 similar to the acoustic filter unit 5, it is sufficient to suppress the output of the loud sound of the speaker 13 to the outside. However, when a switch or the like for turning on / off the output of the speaker 13 for reproducing the high frequency range is provided, the acoustic filter section 6 does not need to be provided. Also, the case where the built-in speaker 11 is for low-frequency sound reproduction (mainly having a reproduction frequency of less than 1 kHz) and the speaker 13 is for medium-high sound reproduction (mainly having a reproduction frequency of 1 kHz or more) Does not require the acoustic filter unit 5 for covering the speaker 11 side. It goes without saying that the present invention can be applied not only to the two-way loudspeaker shown in FIG. 3 but also to a three-way loudspeaker.
[0033]
The support pole 3 is used as a means for supporting the external speaker 2, but other means such as the speaker stand 104 described above may be used. However, in this case, means for fixing the acoustic filter unit 5 (and 6) to the front of the built-in speaker 11 (and 13) is separately required.
[0034]
Furthermore, in the present embodiment, the frequency that is the boundary between the loudspeakers in the loudspeaker 1 and the external loudspeaker 2, that is, the crossover frequency f _C is set to f _C = 1 kHz, but is not limited to this. . For example, if this crossover frequency f _C is set to a value of f _C = 500 Hz or more and 1 kHz or less, substantially the same operation and effect as described above can be obtained. However, the difference in the crossover frequency f _C causes a slight difference in the clarity of the loud sound, the size of the external speaker 2, and the like. Further, in the present embodiment, the speaker unit 2a of the external speaker 2 has a cone shape, but may have another shape such as a horn shape or a dome shape. That is, depending on the value of the crossover frequency f _C , it may be advantageous in terms of size, sound quality, cost, etc., to make the speaker unit 2a horn-shaped or dome-shaped rather than cone-shaped.
[0035]
【The invention's effect】
As described above, according to the loudspeaker of the first aspect of the present invention, sounds in different sound ranges are loudspeaked from the speaker of the loudspeaker body and the external speaker. Therefore, the loudspeakers of the speakers do not interfere with each other, and thus there is an effect that a change in the directional characteristics of the speakers and unevenness (disturbance) in the reproduction frequency band caused by the interference can be prevented. Further, since the external speaker is used for reproducing the middle and high frequency range, it is possible to realize a reduction in size, weight, and cost as compared with, for example, a full-band speaker.
[0036]
Since the external speaker is installed at a position higher than the speaker on the loudspeaker main body side by the support means, there is an effect that high clarity can be obtained even in a place away from the loudspeaker (external speaker). Further, since the external speaker is small and lightweight, the supporting means itself does not need to be very strong. Therefore, the structure of the supporting means itself can be simplified, and the weight and cost of the supporting means can be reduced. There is also an effect that it can be realized. Further, the support means can be arbitrarily attached to and detached from the loudspeaker body. Therefore, it is very convenient when carrying or storing the loudspeaker body.
[0037]
Further, by merely attaching the support means to the loudspeaker main body, the suppression (acoustic filtering) action of the treble suppression means of the acoustic filter means reduces the middle and high frequency components of the sound emitted from the front of the speaker of the loudspeaker body. Can be attenuated. That is, as a method of suppressing the mid-high range sound from the speaker of the loudspeaker main body, for example, an electric low frequency pass filter (LPF) circuit is inserted on the input side of the speaker, and this is connected to an external speaker. A method of turning on / off according to the presence / absence of the presence is also conceivable. However, according to this method, the above-mentioned low frequency pass filter circuit and switching means such as a changeover switch for turning it on / off are required. On the other hand, according to the fourth aspect of the present invention, since the mid-high range can be suppressed only by attaching the support means to the loudspeaker main body, the low frequency pass filter circuit, the changeover switch, and the like are provided. No need. Accordingly, there is an effect that the cost can be reduced accordingly and the invention according to claim 1 can be applied to an existing loudspeaker.
[0038]
According to the loudspeaker of the second aspect of the invention, similarly to the first aspect of the invention, the sound in the middle and high frequency range is loudspeaked from the external speaker, and the loudspeaker of the loudspeaker body is provided with the high frequency range suppression means. Due to the suppression effect, only the sound in the low frequency range lower than the middle and high frequency range is amplified. That is, sounds in different sound ranges are amplified from each speaker. Therefore, the loud sound of each speaker does not interfere with each other. In addition, since the external speaker is installed at a position higher than the speaker on the loudspeaker main body side by the supporting means, high clarity can be obtained even in a place away from the loudspeaker (external speaker). Further, the treble suppression means is constituted by an acoustic filter means for acoustically attenuating the mid-high range sound loudspeaked from the speaker of the loudspeaker main body. Integrated with the means. Therefore, the mid-high range can be attenuated only by attaching the support means to the existing loudspeaker, that is, the invention according to claim 2 can be applied to the existing loudspeaker.
[0039]
According to the loudspeaker of the third aspect of the present invention, the number of components (the number of parts) of the present invention is reduced by integrating the external speaker and the support means. Accordingly, there is an effect that the management, transportation, and the like of each component of the present invention are facilitated accordingly.
[0040]
According to the loudspeaker of the fourth aspect of the present invention, the low-frequency sound is loudspeaked from the external speaker by further providing the low-frequency range suppression means for the external speaker for middle and high frequency range reproduction. Almost completely blocked. Therefore, there is an effect that the loud sound of the external speaker and the loud sound of the speaker of the loudspeaker main body can be more reliably prevented from interfering with each other.
[0041]
In the loudspeaker according to the present invention, the predetermined frequency is set to a value of 500 Hz or more and 1 kHz or less. With this setting, the same effects as those of the first, second, third, and fourth aspects can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a loudspeaker according to the present invention.
2A and 2B are diagrams showing reproduction frequency characteristics of the embodiment, in which FIG. 2A shows reproduction frequency characteristics of an internal speaker and an external speaker of a loudspeaker, and FIG. FIG. 9 is a diagram showing the overall reproduction frequency characteristics obtained by synthesizing the characteristics.
FIG. 3 is a diagram showing another example different from FIG. 1;
FIG. 4 is an external view showing a schematic configuration of a conventional loudspeaker.
FIG. 5 is a diagram showing another conventional example different from FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Loudspeaker 2 External speaker 3 Support pole (support means)
5 Acoustic filter unit (high frequency range suppression means)
11 Built-in speaker

Claims (5)

A loudspeaker body with speakers,
An external speaker provided outside the loudspeaker main body separately from the speaker of the loudspeaker main body and mainly loudspeaking a sound in a frequency band equal to or higher than a predetermined frequency according to an acoustic signal given from the loudspeaker main body;
Treble suppression means for suppressing the sound of the predetermined frequency or higher from being loudspeaked from the speaker of the loudspeaker body,
Support means for supporting the external speaker in a state of being positioned higher than the speaker of the loudspeaker body;
With
The support means is configured to be detachable from the loudspeaker body,
The treble suppression means is an acoustic filter means for acoustically attenuating a component having a frequency equal to or higher than the predetermined frequency of a sound loudspeaked from a speaker of the loudspeaker body, and is integrated with the support means. A loudspeaker. A loudspeaker body with speakers,
An external speaker provided outside the loudspeaker main body separately from the speaker of the loudspeaker main body and mainly loudspeaking a sound in a frequency band equal to or higher than a predetermined frequency according to an acoustic signal given from the loudspeaker main body;
Treble suppression means for suppressing the sound of the predetermined frequency or higher from being loudspeaked from the speaker of the loudspeaker body,
Support means for supporting the external speaker in a state of being positioned higher than the speaker of the loudspeaker body;
With
The treble suppression means is an acoustic filter means for acoustically attenuating a component having a frequency equal to or higher than the predetermined frequency of a sound loudspeaked from a speaker of the loudspeaker body, and is integrated with the support means. A loudspeaker. 3. A loudspeaker according to claim 1, wherein said external speaker and said support means are integrated. 4. The loudspeaker according to claim 1, further comprising a low-frequency range suppression unit that suppresses a sound having a frequency lower than the predetermined frequency from being loudspeaked from the external speaker. 5. The loudspeaker according to claim 1, wherein said predetermined frequency is set between 500 Hz and 1 kHz.

Images