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JPS57143780

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DESCRIPTION JPS57143780
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional speaker
system, FIG. 2 is an output sound pressure-frequency characteristic diagram, FIG. 3 is an acoustic
energy frequency characteristic diagram, and FIGS. 4 a, b, c and FIG. 5 is a perspective view from
the rear of the inventive speaker system. 1 is a woofer 12; tweeter 13 is a cabinet; 42 is a first
compensating speaker; 43 is a second compensating speaker; 41 is a trapezoidal box.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker system and aims to flatten the energy (acoustic basso) in the listening space of the
speaker system. Referring to a two-way type speaker having a conventional speaker system
including a woofer (bass speaker) and a tweeter (high-pitch speaker) 35 ′ rust 3 in FIG.
Reference numeral 2 denotes a cou-71 tweeter having an opening disposed in the baffle surface
of the speaker cabinet 8, and the radiation axis of the speaker 1.2 coincides with the front
direction of the cabinet. Then, the network circuit (FIG. 2 blue electrical signals divided into
respective Gyushu functional bands by the blue speaker in FIG. 2) is applied to the U-no- and the
tweeter, and the turtle, U-Solo. Fig. 2 shows the frequency characteristics of the input signal
divided by the network circuit. 21 indicates a human power signal, and 22 indicates a human
power signal. Both input signals are used in order to flatten the overall performance. Crossing
frequency f of the characteristic of faith. It is usual to configure each input level to be attenuated
by 3 dB at (Taros over frequency). However, the above-mentioned "characteristic is the
characteristic by direct even only in the no Chi room, and in the room actually used by the user,
not only the above-mentioned direct sound but also the indirect part by the 36, 9 reflections such
as vats doing. In the past, in designing a speaker system, it is preferable to make the MIlh of the
phase of the direct wave and the indirect sound be constant independently of the frequency or,
as is well known, the speaker The higher the frequency is, the more the directivity gets worse
and the less the amount of indirect change. . If this is considered by sound power (integral value
of -6 at the spherical surface centering on a sound source) t level, as it is not shown in FIG. It
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begins to decrease as shown in FIG. This frequency 71 was found to be 71 = (0,5 to 0.6) c7'2 [pi]
M W (where C is the speed of sound, M: the effective radius of vibration of Kuno's-) from various
experiments. However, the 6 饗 power in the conventional two-way speaker system can not
obtain flat characteristics as shown in FIG. This is not preferable in the case of hearing, as the
sound dropout phenomenon occurs. 83 ° 7-one) '! The same phenomenon (FIG. 32) also occurs
in イ ー 1
5 or eater, and it has its own defect that playback of high-pitched sound is
insufficient.
Therefore, the present invention comprises a compensating speaker for reproducing only the
frequency band to increase indirect sound in the frequency band where the sound power level
decreases, and radiates to the rear of the cabinet and mainly the indirect sound by the rear wall
reflection. In order to measure the increase, the embodiment F will be described in detail. In FIG.
4, 2.3 is the same as that shown in FIG. Reference numeral 41 denotes a box housing the first
compensation speaker 42 and the second correction speaker 43. The compensation speaker
43.42 is attached to the inclined plate portion of the substantially trapezoidal box. Then, for the
first compensation speaker 42, / L = (0, 5, 0, 6) c / 2 to aH to fc = (0, 5, 0, 6) c / 2πa 3 (c : Line
speed, a1 near "effective vibration radius of 1, a3: sleeve (effective vibration radius of the speaker
43 for n f2! 7−ハー138ヘ・′ジ・リ。 And the electric signal selected by the net soak
circuit or the like to reproduce the frequency band of the tweeter-2 and the glue 70 (zero
frequency), and / 'H = (0,5) is input to the second compensation speaker 48. An electric signal
selected by a network circuit or the like is input to reproduce a frequency band of -0, 6) c / 2 *
a2 (where a2: effective vibration radius of tweeter-2). According to the speaker system, the
indirect sound is heard together with the direct sound by the woofer-1 and the tweeter-2, and the
first and second compensating speakers in the frequency band in which the indirect sound from
the speaker 1.2 decreases. The indirect sound due to the rear wall reflection sound wave of the
speaker 42.43 is superimposed, and the reduction of the indirect sound due to the squawker and
the tweeter can be compensated, and the sound spread pan is constant over the entire
reproduction frequency. Therefore, according to the speaker system, as in the prior art, it is
possible to prevent the phenomenon that sound loss in a specific frequency band adversely
affects the sense of hearing, etc. 39-,) Q ..). In the above embodiment, the first and second
compensation speakers 42. 48 are accommodated in the trapezoidal box 41, and the radiation
axes of the compensation speakers are arranged to be inclined outward in the rear surface
direction, or the fourth As shown in FIG. 4 (b), it may be arranged to be inclined inward in the
rear surface direction, and to be inclined upward in the rear surface direction as shown in FIG. 4
(c). Also, by making the mounting surface of the speaker 42.48 curved, it is possible to expand
the radiation angle 13 As described above, the first and second compensating speakers are
separated from the cabinet 3 and a separate box 41 The configuration stored in the box 41 can
be selected appropriately according to the room acoustical characteristics of the user by
variously changing as shown in FIG. 4 (a) (bl (cl illustrated in FIG. 4).
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In addition, as shown in FIG. 5, it is also possible to attach one car 42.43 for first and second
sleeve reconnaissance through a pedestal 52.53 for making the L-face plate of the cabinet 3
inclined. is there. The number of the first and second compensating speakers is not limited to the
embodiment described in L, and it may be selected appropriately according to the design
purpose. As described in E below, the present invention averages the acoustic power by making
the first and second compensation speakers as indirect sound generation sources to compensate
for the reduction of indirect sound at a specific frequency in the reproduction sound field. It is a
practically effective device that can be measured and enables extremely excellent reproduction.
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