Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPH11355879 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite equivalent coaxial speaker system in which bass speakers are disposed above and below a high-pitched speaker. [0002] Conventionally, in this type of speaker, since the synthesized sound source of the bass speakers arranged at the top and bottom overlaps the treble speaker arranged at the center, the sound source positions coincide in all frequency regions from the bass area to the treble area, There is a feature that good localization can be obtained. [0003] FIG. 2 is a side view showing an example of a conventional combined equivalent coaxial speaker system. It is a two-way speaker consisting of the bass speakers 1 and 2 and the treble speaker 3. By keeping the trial listening point L on the general axis of the speaker system, it is shown that the sound source is concentrated at the center of the speaker in all frequency bands. 02-05-2019 1 [0004] Figure 2 [0005] SUMMARY OF THE INVENTION As the combined equivalent coaxial speaker system uses a large diameter bass speaker, the height increases, the speaker system becomes extremely large, and the use restrictions increase. Even in the case of the equivalent coaxial speaker system, if the upper and lower speakers are far apart from each other, the clearness of the sound image may be disturbed due to the difference in reflection path when installed indoors. [0006] In order to solve this problem, it is possible to use several small diameter bass speakers in place of the large diameter bass speakers and to shorten the height. Therefore, when the listening point is shifted to the left and right, the sound source moves in the shifted direction, which causes a problem that localization is unstable, which is not practical. [0007] It is an object of the present invention to provide a composite equivalent coaxial speaker system that has a sufficient radiation area necessary for bass reproduction, but does not excessively increase the vertical dimension of the speaker unit arrangement portion in the speaker system, and makes it wider and stable. It is in providing a speaker system which secures a listening area and has good acoustic performance. [0008] [Means for Solving the Problems] In order to solve the above-mentioned problems, instead of two conventional large-diameter bass speakers, four relatively small-diameter bass speakers are used, and two are grouped as a group. Arranged above and below the high-pitched speakers, the two speakers included in each group are arranged horizontally, and the speakers face inward at an opening angle α, and α is between 150 ° and 110 ° It is characterized by [0009] 02-05-2019 2 BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a composite equivalent coaxial speaker system according to the present invention. The same reference numerals are given to parts that perform the same functions as those of the above-described conventional example, and redundant description will be omitted as appropriate. [0010] Figure 1 [0011] In this embodiment, 1A, 1B, 2A, 2B are bass speakers, and 3 is a treble speaker. 1A and 1B are arranged as a group on 3 and 2A and 2B as a group are arranged below 3 to be equivalent coaxial. Furthermore, 1A, 1B, and 2A, 2B are respectively arranged horizontally, and are facing inward at an opening angle α. The four bass speakers 1A, 1B, 2A, 2B are wired so that the same signal can be applied. The opening angle α is set between 150 degrees and 110 degrees. This angle is determined in consideration of the speaker aperture, the use band, the setting of the listening area, and the like. [0012] In general, the speaker has the highest sound pressure on the axis and a directional feature that decreases around it. In the two horizontally arranged speakers as shown in FIG. 3, when the 02-05-2019 3 listening point moves to N horizontally with reference to two on the central axis M, the speaker A on the moved side becomes closer and the pointing Due to sexual effects, sound pressure is increased. The distant speaker B has a large distance and also has an influence of directivity, and the sound pressure is reduced. Therefore, as the listening point moves from M to N, the combined sound source of the two speakers also moves from m to n. [0013] Figure 3 [0014] On the other hand, as shown in FIG. 4, when the two speakers face each other at the opening angle α, the sound pressure of the moved speaker A is equal to the distance when the listening point moves from M on the synthetic axis to N. While it rises as it approaches, it attenuates by directivity. The sound pressure of the other speaker B attenuates as the distance increases, but the directivity rises as it goes on axis. By appropriately selecting the opening angle α, it is possible to mutually compensate the change in sound pressure due to the distance and the directivity and eliminate the movement of the sound source. This state is equivalent to one speaker at the center. [0015] Figure 4 [0016] After arranging horizontally in this manner, two bass speakers facing inward at an appropriate angle α are grouped, and a pair of loudspeakers are arranged so as to be sandwiched up and down. As described above, the bass loudspeakers arranged above and below operate such that there is one loudspeaker at the center of each. Furthermore, when these are synthesized at the top and 02-05-2019 4 bottom, the synthesized sound source coincides with the treble speaker position and does not move regardless of the listening position, so that good localization can be obtained. [0017] In the embodiment of FIG. 1, the outside of the bass speaker mounting surface is folded at an angle of β. Furthermore, it is folded back at 90 degrees to make a side wall. In this configuration, as compared with the case where the outer surface of the mounting surface of the bass speaker is flat, the acoustic resonance phenomenon caused by the depression of the bass speaker mounting portion is alleviated and is further generated at the corner portion of the cabinet. Diffraction phenomena can also be reduced, and better performance can be obtained. The opposing surfaces inside the cabinet are also reduced, which also helps to suppress internal standing waves. The appropriate value of β is 7.5 degrees to 17.5 degrees. [0018] Furthermore, in the embodiment of FIG. 1, the entire baffle is W-shaped except for the high-tone speaker attachment surface, and the upper and lower parts of the attachment portion for the lowtone speaker are open. By configuring in this way, it is possible to avoid the acoustic resonance phenomenon due to the V-shaped recess of the mounting portion of the bass speaker, and to obtain more straightforward characteristics and good sound quality. Can do. [0019] According to the present invention, among the sounds emitted from the treble speaker, the sound directed toward the rear and reflected by the bass speaker mounting surface is also reflected by the W-shaped baffle as compared with the reflection by the conventional flat surface. Is a randomness, so there is little interference with direct sound, and an improvement effect will be produced for the high tone range. [0020] In the present invention, the four bass speakers have the same performance, and basically the same signal is added to each of them. However, the low-pass characteristics of the four speakers may be slightly different or the used band It is needless to say that they are included in the present invention as long as the effects of the present invention can be obtained even if they are different. 02-05-2019 5 02-05-2019 6
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