JP2005223674A - Speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker apparatus which makes it possible to reduce costs without using an expensive filter circuit having complicated structure and sharply improve the degree of freedom of design of the frequency characteristics of sound wave radiation. <P>SOLUTION: A duct 19 is formed on a front plate part 18 located on the front surface of an enclosure 16, and a lower plate part 21 consisting of a first face (horizontal plate part 21a) and a second face (inclined plate part 21b) formed at an angle different from the first face is formed on the lower face of the enclosure 16. The horizontal plate part 21a is arranged so as to intersect with the front plate part 18 at right angles, and a speaker unit 22 is fixed on the center thereof. The inclined plate part 21b is constituted so as to form an inclination angle θ from the plate surface of the horizontal plate part 21a, and a speaker unit 23 is fixed on the center thereof. The four corners of the lower plate part 21 of the enclosure 16 are fixed in a state floating from a bottom plate 17 through first pillar parts 20a and second pillar parts 20b, and a gap in the floated part serves as a sound radiating aperture. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to an improvement of a speaker device for reproducing a low frequency sound frequency.

  A speaker device called a subwoofer that reproduces only a low-frequency component of the frequency band of an audio electrical signal output from a variety of audio reproduction devices is similar to the speaker device 1 shown in FIG. There is an example in which a speaker unit 4 dedicated to low frequency reproduction is fixed to the front plate part 3 and a duct 5 for bass reflex reproduction is provided on the front plate part 3.

  In this example, a state in which a sound wave component radiated from the opening of the duct 5 is added to a sound wave component radiated forward from the speaker unit 4, that is, a state in which the low frequency component is enhanced by sound wave radiation from the duct 5. The frequency characteristics are substantially flat from 50 Hz to 1 kHz, for example, as shown by the symbol a in the characteristic diagram showing the relationship between the audio frequency and the output sound pressure level as shown in FIG. Played. FIG. 3 is a diagram representing the sound emission characteristics (symbols a, b, c) of the conventional apparatus and the sound emission characteristic (symbol d) of the apparatus of the present invention.

  However, in this speaker device 1, since there is an overlapping portion in the reproduction band from speakers other than the subwoofer (for middle and high frequencies), the sound field feeling is impaired when considering the entire reproduced sound wave, and particularly the stereo feeling Will be damaged.

  For this reason, the signal is supplied to the speaker unit 4 with a filter circuit for limiting the sound wave band to be emitted only to the low frequency range interposed.

  On the other hand, without using the filter circuit as described above, the duct 5 is positioned on the front plate portion 3 of the enclosure 2 as in the speaker device 6 shown in FIG. Thus, the sound wave from the speaker unit 4 is radiated to the side, so that the mid-high frequency component unnecessary for the subwoofer is naturally attenuated, and the characteristic b shown in FIG. 100 Hz can be reproduced substantially flat.

  In other words, the speaker device 6 shown in FIG. 7 does not reach the position of the listener located in front of the front plate portion 3 because the mid-high frequency component radiated from the speaker unit 4 has a sharp directivity. This means that only low frequency components with almost no sex reach.

  This speaker device 6 is provided with the speaker unit 4 on the side, but there is an example in which it is provided below.

  That is, the speaker device 7 shown in FIG. 8 is configured by providing column portions 10 at the four corners of the upper portion of the rectangular bottom plate 9 and placing the enclosure 8 thereon.

  The opening of the duct 14 is positioned in the front plate portion 13 of the enclosure 8, and the speaker unit 12 is provided on the bottom plate portion 11 at the bottom of the enclosure 8.

  For this reason, when an audio electric signal is supplied to the speaker unit 12, the mid and high frequency components radiated from the speaker unit 12 are sharply directional and are extremely attenuated by the presence of the bottom plate 9 and are forward of the front plate portion 13. Only the low frequency component having almost no directivity reaches the listener in a state of being reflected by the bottom plate 9 without reaching the position of the listener.

  Therefore, the sound emission characteristic in the speaker device 7 is as indicated by the symbol c shown in FIG. 3, and the mid and high frequency components are further attenuated as compared with the characteristic b of the speaker device 6 (see FIG. 7). This is a desirable characteristic for a subwoofer with a peak in the vicinity.

  When a low-pass filter circuit is used to emit only a low-frequency component, the conventional speaker device is a low-frequency reproduction that requires a relatively large amount of power. When the circuit is configured with a large-diameter and large-sized coil, there is a difficulty in using the circuit. When the circuit is configured with an active circuit, a precision electronic component such as an operational amplifier must be used. In any case, the cost may increase.

  On the other hand, when the speaker unit is mounted on the lower surface or side surface of the enclosure without using a low-pass filter circuit for supplying the audio / electrical signal to the speaker unit, there are several types of mounting positions (up / down / left / right and Therefore, the degree of freedom of design is low and the overall frequency characteristics cannot be designed in detail, and other speakers used in combination with the speaker device, that is, the main located in the left and right fronts. It is difficult to optimize the matching with the band of the speaker, the center speaker located in the center, etc. Generally, a dip characteristic is generated, and it is difficult to achieve a comprehensive characteristic. This is the current situation.

  Accordingly, an object of the present invention is to provide a speaker device that can achieve cost reduction without using a complicated and expensive filter circuit and that can greatly improve the degree of freedom in designing the frequency characteristics of sound wave emission. It is in.

  In order to solve the above-described problems, the speaker device according to the present invention employs characteristic configurations as listed below.

  (1) A first speaker unit provided on a first surface formed in a speaker enclosure, and a second surface formed on the speaker enclosure at a different angle with respect to the first surface. And a signal supply means for supplying a substantially equivalent audio / electric signal to each of the first and second speaker units, and the first speaker. A synthesized sound of the first radiated sound radiated directly and indirectly from the unit and the second radiated sound radiated directly and indirectly by the second speaker unit is radiated to the listener. A speaker device configured to be able to.

  (2) The speaker according to (1), wherein each of the first surface and the second surface is configured by a continuous surface and has a predetermined inclination angle. apparatus.

  (3) The loudspeaker device according to (1), configured such that sound waves from the first loudspeaker unit provided on the first surface are radiated directly in front of the first surface.

  (4) The above (1), wherein the sound wave by the first speaker unit provided on the first surface is radiated indirectly through a reflecting member disposed in front of the first surface. ) Speaker device.

  (5) The loudspeaker device according to (1), configured such that sound waves from the second loudspeaker unit provided on the second surface are directly emitted in front of the second surface.

  (6) The above (1) is configured such that sound waves from the second speaker unit provided on the second surface are radiated indirectly through a reflecting member disposed in front of the second surface. ) Speaker device.

  (7) The speaker device according to any one of (1) to (6), wherein the speaker enclosure is configured as a sealed type and includes a bass reflex duct.

  (8) The speaker device according to any one of (1) to (6), wherein the speaker enclosure is partially open.

  (9) The speaker device according to any one of (1) to (8), wherein the first and / or second speaker unit includes a plurality of speaker units.

  The speaker device according to the present invention uses a low-pass filter circuit called a speaker divider or the like, or uses a filter circuit that passes only the low-frequency electric signal supplied to the speaker unit. There is no significant cost reduction.

  Also, when designing the overall sound emission characteristics of the speaker device, the overall frequency characteristics can be designed finely by designing the shape of the speaker enclosure. It is possible to easily perform the design that optimizes the matching with the bands of the speakers, that is, the main speaker located in front of the left and right, the center speaker located in the center, and the like, and the design flexibility can be remarkably improved.

  Therefore, according to the present invention, it is possible to provide a speaker device that can achieve cost reduction without using a complicated and expensive filter circuit and that can greatly improve the degree of freedom in designing the frequency characteristics of sound wave emission. Can do.

  An embodiment of the present invention will be described as [Example 1] with reference to FIGS. In this example, the present invention is applied to a speaker device in which a speaker enclosure is configured as a sealed type and includes a bass reflex duct.

  1 is an external perspective view, and FIG. 2 is a cross-sectional view. The speaker device 15 includes a sealed enclosure 16 and has a rectangular bottom plate 17 below the enclosure 16.

  A duct 19 is provided in the front plate portion 18 located on the front surface of the enclosure 16, and a lower surface of the enclosure 16 has a first surface (horizontal plate portion 21a) and a different angle with respect to the first surface. The lower surface plate part 21 which consists of the 2nd surface (inclined plate part 21b) formed by having is provided.

  In addition, the first surface (horizontal plate portion 21a) and the second surface (inclined plate portion 21b) are configured by a continuous surface, and each has a predetermined inclination angle. A bottom plate portion 21 is provided.

  The horizontal plate portion 21a is positioned so as to be orthogonal to the surface on which the front plate portion 18 is formed, and the first speaker unit 22 is fixed at the center so that the sound wave emission direction is downward, and the inclined plate portion 21b is horizontally The second speaker unit 23 is fixed at the center thereof so that the sound wave emission direction is downward.

  The bottom plate portion 21 of the enclosure 16 is fixed to the four corners of the bottom plate 17 via the first column portions 20a and 20a and the second column portions 20b and 20b in a floating state, and the gaps are released. Sound opening.

Accordingly, when a substantially equivalent audio electric signal is supplied to each of the first speaker unit 22 and the second speaker unit 23 using a signal supply means (not shown), the first speaker unit 22 is provided. A synthesized sound wave of the first radiated sound wave radiated directly and indirectly from the second sound wave directly and indirectly radiated by the second speaker unit 23 is forward of the front plate 18. Radiated to the listener who is located.

  The sound wave radiated in front of the first speaker unit 22 is extremely attenuated due to the presence of the gap between the bottom plate 17 and the middle plate, so that the listener is extremely attenuated and positioned in front of the front plate 18. Only the low-frequency component having almost no directivity reaches the first radiation component by the first speaker unit 22 from the radial opening formed by the inclined plate portion 21b toward the listener. (Note that the first radiated sound wave component includes a low-frequency component in which sound waves generated on the back surface of the first speaker unit 22 are radiated from the duct 19).

  Simultaneously with the first sound wave radiation from the first speaker unit 22, the second sound wave radiation from the second speaker unit 23 is made. Due to the presence of the bottom plate 17 located in the forward direction and the radial gap, the medium and high Since the component of the region is sharp in directivity, it is moderately attenuated and radiated in front of the front plate portion 18 (note that the second radiated sound wave component is a sound wave generated on the back surface of the second speaker unit 23). A low-frequency component radiated from the duct 19 is included).

  The total sound emission component of the speaker device 15 at this time, that is, the total characteristics of the first and second sound wave radiations, is indicated by the symbol d shown in FIG. 3 when the inclination angle θ of the inclined plate portion 21b is 25 degrees. And is located between a and b in the characteristic example (a, b, c) of the conventional speaker device.

  When designing the final characteristics of the speaker device 15, when the inclination angle θ is larger than 25 degrees, it can be changed toward a high frequency range, and conversely, when it is decreased, it can be changed toward a low frequency range.

  In other words, using the property that increasing the tilt angle θ decreases the amount of attenuation of the middle and high frequency components radiated from the second speaker unit 23, and conversely, decreasing the tilt angle θ increases the amount of attenuation. The low-frequency characteristics fixedly provided by the first speaker unit 22 are enhanced by the second speaker unit 23, and the amount of enhancement can be designed by adjusting the inclination angle θ, so that the design is free. The degree can be significantly improved.

  The speaker device 15 used as a subwoofer is designed to have an inclination angle θ so as to suit the characteristics of other speakers used in combination, that is, a main speaker located in front of the left and right, a center speaker located in the center, and the like. Thus, it is possible to prevent a dip from occurring at an overall specific frequency of the entire system.

  [Embodiment 1] described above is an example in which two speaker units are provided on the lower surface of the enclosure, but one may be provided on the lower surface and the other may be provided on the side surface. This example will be described as [Embodiment 2].

  In FIG. 4, a duct 19 is provided in the front plate portion 18 positioned on the front surface of the enclosure 16 constituting the speaker device 24, a bottom plate 17 is fixed to the lower surface of the enclosure 16, and a second plate is formed at the center of the side plate portion 25. One speaker unit 22 is fixed.

  The side surface plate portion 25 includes a first surface, and a second surface (inclined plate portion 26) formed at a different angle with respect to the first surface. In addition, the first surface (side plate portion 25) and the second surface (inclined plate portion 26) are disposed at different angles, and the inclined plate portion 26 is arranged with respect to the bottom plate 17 via a column 16a. The second speaker unit 23 is fixed at the center of the inclined plate portion 26 so that the sound wave radiation direction is downward.

  Therefore, when a substantially equivalent audio electric signal is supplied to each of the first speaker unit 22 and the second speaker unit 23 using a signal supply means (not shown), the first speaker unit 22 is provided. The synthesized sound wave of the first radiated sound wave radiated directly and indirectly from the second sound wave directly and indirectly radiated by the second speaker unit 23 is forward of the front plate portion 18. Radiated to the listener who is located.

  Since the sound wave radiated in front of the first speaker unit 22 is in a direction that is different from the listener's position by an angle of 90 degrees, the mid-high frequency component is extremely attenuated because of its sharp directivity. Only the low-frequency component having almost no directivity reaches the listener without reaching the listener located in front of the front plate portion 18 (Note that the first speaker unit is the first radiated sound wave component. 22 includes a low-frequency component in which sound waves generated on the back surface of 22 are radiated from the duct 19).

  Simultaneously with the first sound wave radiation from the first speaker unit 22, the second sound wave radiation from the second speaker unit 23 is made, and the presence of the radial gap between the bottom plate 17 that is inclined to the lower side and the bottom plate 17. The middle and high frequency components are sharply directional and are moderately attenuated and radiated in the direction of the listener (note that the second radiated sound wave component is a sound wave generated on the back surface of the second speaker unit 23). A low-frequency component radiated from the duct 19 is included).

  The total sound radiation of the speaker device 24 at this time, that is, the total characteristics of the combined first and second sound radiations is shown in FIG. 3 when the tilt angle θ of the tilted plate portion 26 is 25 degrees. It becomes like the code | symbol d shown, and is located in the middle of a and b of the characteristic example (a, b, c) of the conventional speaker apparatus.

  When designing the final characteristics of the speaker device 24, when the inclination angle θ is larger than 25 degrees, it can be changed toward a high range, and conversely, when it is decreased, it can be changed toward a low range.

  In other words, using the property that increasing the tilt angle θ decreases the amount of attenuation of the middle and high frequency components radiated from the second speaker unit 23, and conversely, decreasing the tilt angle θ increases the amount of attenuation. The low-frequency characteristics fixedly provided by the first speaker unit 22 are enhanced by the second speaker unit 23, and the amount of enhancement can be designed by adjusting the inclination angle θ, so that the design is free. The degree can be significantly improved.

  The speaker device 24 used as a subwoofer is designed to have an inclination angle θ so as to suit the characteristics of other speakers used in combination, that is, a main speaker positioned in front of the left and right, a center speaker positioned in the center, and the like. Thus, it is possible to prevent a dip from occurring at an overall specific frequency of the entire system.

  [Embodiment 1] and [Embodiment 2] are examples in which no speaker unit is provided on the front plate portion of the enclosure, but a speaker unit may be provided on the front plate portion. This example will be described as [Embodiment 3].

  In FIG. 5, a duct 19 is provided in the front plate portion 18 positioned on the front surface of the enclosure 16 constituting the speaker device 27, and a column 29 is provided at each of four corners of the bottom plate portion 28 positioned on the lower surface of the enclosure 16. And is fixed in a state of being lifted from the bottom plate 17.

  The front plate portion 18 of the enclosure 16 has a first surface, and a second surface (bottom plate portion 28) formed at a different angle with respect to the first surface. A duct 19 and a first speaker unit 22 are provided on the front plate 18, and a second speaker unit 23 is provided in the center of the bottom plate 28.

  Therefore, when a substantially equivalent audio electric signal is supplied to each of the first speaker unit 22 and the second speaker unit 23 using a signal supply means (not shown), the first speaker unit 22 is provided. The synthesized sound wave of the first radiated sound wave radiated directly and indirectly from the second sound wave directly and indirectly radiated by the second speaker unit 23 is forward of the front plate portion 18. Radiated to the listener who is located.

  Since the sound wave radiated in front of the first speaker unit 22 is directed to the listener's position, the entire band component reaches the listener (note that the first radiated sound wave component is the first component). The sound wave generated on the back surface of the speaker unit 22 is a low-frequency component emitted from the duct 19).

  Simultaneously with the first sound wave radiation from the first speaker unit 22, the second sound wave radiation from the second speaker unit 23 is made, and due to the presence of a predetermined radiation space located below it, the components in the middle and high range are Since the directivity is sharp, it is extremely attenuated and radiated in the direction of the listener (note that as a component of the second radiated sound wave, a sound wave generated on the back surface of the second speaker unit 23 is radiated from the duct 19. Includes low-frequency components).

  The total sound emission of the speaker device 27 at this time, that is, the total characteristic of the first and second sound emission synthesized is substantially equal to the symbol d shown in FIG. It is located between a and b in the example (a, b, c).

  When designing the final characteristics of the speaker device 27, it is possible to design the amount of the mid-high frequency component in the second speaker unit 23 by appropriately designing the size of the gap between the bottom plate portion 28 and the bottom plate 17. By increasing the size, the sound emission characteristic of the entire speaker device 27 can be changed toward a high range, and conversely, when the size is reduced, the sound emission characteristic can be changed toward a low range.

  In other words, if the dimension is increased, the attenuation amount of the middle and high frequency components radiated from the second speaker unit 23 is decreased. Conversely, if the dimension is decreased, the attenuation amount increases. The low-frequency characteristics fixedly provided by the unit 22 are enhanced by the second speaker unit 23, and the amount of enhancement can be easily designed, so that the degree of freedom in design can be remarkably improved.

  In addition, the speaker device 27 used as a subwoofer is designed with the dimensions so as to suit the characteristics of other speakers used in combination, that is, a main speaker positioned in front of the left and right, a center speaker positioned in the center, and the like. It is possible to prevent a dip from occurring at a specific specific frequency of the entire system.

  Note that the speaker device according to the present invention is not limited to the above-described [Embodiment 1] to [Embodiment 3], and various modifications may be adopted without departing from the scope of the invention.

  The speaker enclosure is configured as a sealed type and has a bass reflex duct, and the enclosure is configured. However, the speaker enclosure is partially configured as an open type or does not have a bass reflex duct. Each of the first and second speaker units may be configured by one unit, but the first and / or second speaker unit may be configured by a plurality of units. Also good.

It is a perspective view which shows the external appearance of the speaker apparatus of [Example 1] which concerns on embodiment of this invention. It is a sectional side view of the speaker apparatus shown by FIG. It is a characteristic view which shows collectively the sound emission characteristic of the conventional speaker apparatus, and the sound emission characteristic of the speaker apparatus to which this invention is applied. It is a perspective view which shows the external appearance of the speaker apparatus of [Example 2] which concerns on embodiment of this invention. It is a perspective view which shows the external appearance of the speaker apparatus of [Example 3] which concerns on embodiment of this invention. It is a perspective view which shows the external appearance of an example of the conventional speaker apparatus. It is a perspective view which shows the external appearance of the other example of the conventional speaker apparatus. It is a perspective view which shows the external appearance of the further another example of the conventional speaker apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Enclosure 3 Front plate part 4 Speaker unit 5 Duct 6 Speaker apparatus 7 Speaker apparatus 8 Enclosure 9 Bottom plate 10 Pillar part 11 Lower surface board part 12 Speaker unit 13 Front plate part 14 Duct 15 Speaker apparatus 16 Enclosure 16a Support column 17 Bottom board 18 Front plate portion 19 Duct 20 Column portion 21 Lower surface plate portion 21a Horizontal plate portion 21b Inclined plate portion 22 First speaker unit 23 Second speaker unit 24 Speaker device 25 Side plate portion 26 Inclined plate portion 27 Speaker device 28 Bottom plate portion 29 Prop

Claims (9)

A first speaker unit provided on a first surface formed in the speaker enclosure;
A second speaker unit provided on the second surface formed at a different angle with respect to the first surface in the speaker enclosure;
Signal supply means for supplying substantially equivalent audio-electric signals to each of the first and second speaker units;
Comprising
Listen to the synthesized sound wave of the first radiated sound wave radiated directly and indirectly from the first speaker unit and the second radiated sound wave radiated directly and indirectly by the second speaker unit. A speaker device configured to be radiated to a person.   The said 1st surface and the said 2nd surface are each comprised by the surface in which each was connected, and it was comprised so that each might have a predetermined | prescribed inclination | tilt angle. Speaker device.   2. The speaker device according to claim 1, wherein a sound wave generated by a first speaker unit provided on the first surface is radiated directly in front of the first surface. 3.   The configuration is such that sound waves from the first speaker unit provided on the first surface are radiated indirectly through a reflecting member disposed in front of the first surface. Item 2. The speaker device according to Item 1.   2. The speaker device according to claim 1, wherein a sound wave generated by a second speaker unit provided on the second surface is radiated directly in front of the second surface. 3.   The configuration is such that sound waves from the second speaker unit provided on the second surface are radiated indirectly through a reflecting member disposed in front of the second surface. Item 2. The speaker device according to Item 1.   The speaker device according to any one of claims 1 to 6, wherein the speaker enclosure includes a bass reflex duct.   The speaker apparatus according to claim 1, wherein the speaker enclosure is partially open. The speaker device according to any one of claims 1 to 8, wherein the first and / or second speaker unit includes a plurality of speaker units.

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