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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional speaker
system, FIG. 2 is the same sound pressure-frequency characteristic diagram, and FIG. 3 is the
same sound
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker system and aims to flatten the energy (acoustic power) in the listening space of the
speaker system. The conventional speaker system is described as a two-way speaker including a
woofer (bass speaker) and a tweeter (high-pitch speaker). In FIG. 1, 3 is a speaker cabinet, 1.2 is
the speaker cabinet 3 in FIG. The woofer is a woofer with an opening disposed on the baffle
surface of the speaker, and the radiation axis of the speaker 1.2 coincides with the forward
direction of the cabinet. Then, the network circuits (the display devices and the respective
speakers (the electric signals divided into the reproducible zones of 簀-are applied to the coober
and the tweeter are applied to the couber and the tweeter. Fig. 2 shows the frequency
characteristics of the human power signal divided by the net soak circuit. 21 is a cooper human
power signal and 49 is one. · 22 is a tweeter-human power signal, and a meat input is performed
to flatten the overall frequency characteristics. It is common practice to configure each human
power level to be attenuated by 3 dB at a frequency 1 ° (crossover frequency) IC where the
signal characteristics cross. However, the above-mentioned characteristic is the characteristic
due to only the direct sound on the radiation axis in the anechoic chamber, and in the room
actually used by the user, not only the direct person but also the indirect sound due to the
reflection of the ceiling, side distortion etc. ing. Therefore, in designing a speaker system, it is
well known that the sound of the sum of the direct sound and the indirect sound should be
independent of the frequency and be a pair, as is well known. Is the indirect quantity as the
reproduction frequency becomes dull as it becomes noon, or becomes smaller as the
reproduction frequency becomes higher, considering this as 6 echo powers (the integral value of
Chang 1t level in the sphere centered on the sound source) In particular, as shown in FIG. 3, the
frequency at which directivity begins to be decreased is reduced to frl as shown in FIG. 31, and
the frequency begins to decrease by 50 '(9', 7-) '. This frequency f1 was found from various
experiments to be j'1 = (0,5,0,6) c / 2gal (where C; b speed, al; effective radius of woofer). In the
past, the acoustic power in the conventional two-way speaker system can not obtain flat
characteristics as shown in FIG. In terms of hearing, this is not preferable because the sound
wave becomes a phenomenon such as. The tweeter also has the same problem (third illusion 32)
or the defect that the reproduction of the original high-pitched sound is insufficient, so this
invention has lII of the diminishing frequency band of the said acoustic hasle. In order to increase
touch noise, a compensation speaker for reproducing only the above-mentioned frequency band
is provided, and it radiates to the rear of the cabinet to mainly deal with indirect sound increase
due to the wall opposite, and the embodiment will be described in detail. .
In FIG. 4, 1.2.3 is the same as that shown in XJJJ1. 41 is the title of cabinet 3 above. A first
compensation speaker disposed in the six holes with the radiation axis and the top facing
upward. The reference numeral 42 denotes a shielding reflector disposed so as to cover the
opening of the first compensation speaker 41, and when the opening is provided on the surface
located on the side of the cabinet, it is formed in a substantially half-cut square pyramid shape.
The second compensation speaker 43 is disposed so that the radiation axis of the speaker 43 is
oriented in the direction of the outer wall surface of the reflection plate 42. The first
compensation speaker 41 is electrically connected from 7L = (0,5 to 0.6) c / 2-al to fH = fc = cO,
5,0,6) c / 2 by an electrical network circuit. -A3 (where C: sound velocity, al: effective vibration
radius of woofer-1 a3: first compensation speaker 41, effective vibration radius of L, U = -1 and
tweeter-crossover frequency of 2) Of the frequency component of the second compensation
speaker 43 in the same manner, ff, = (0, 5- 0, 6) c / 2-a 2 (where a 2: effective radius of vibration
of noita 2) or more Frequency components are input. 52ド、\)? According to the above
configuration, the direct sound of the coober l & tweeter 2 and the indirect sound due to the
reflection of the side wall or the rear wall of the speaker of the speaker sound are heard and the
indirect sound from the speaker 1.2 is reduced In the frequency band, indirect sounds generated
by the first and second compensating speakers 41 and 48 are superimposed. That is, the
radiation sound of the first compensating speaker 41 is reflected to the rear by the reflection
plate 42 and is further emitted to the front by the wall surface of the rear face of the cabinet 3
and reaches the listener as an indirect sound. Further, the radiation sound of the second
compensation speaker 43 is reflected obliquely backward by the reflecting plate 42, and is
reflected forward by the wall in history, and reaches the listener as indirect sound. Therefore,
since the indirect names by the first and second compensating speakers 41. 48 are compensated
in the frequency band in which indirect noises of the speakers 1 and 2 decrease, eight echo
powers can be made constant over the entire reproduction frequency. Therefore, as in the
conventional example, identification 85 in a certain band around specific angle 85; (·) 8 °
'prevents the phenomenon from becoming 1'J1tl :. In the history, since the reflector 42 having
the inclined surface is disposed at the common radiation axis of the first and second
compensating speaker ζ 1143, wide range diffusion due to reflection can be expected, so that a
uniform indirect sound field can be obtained. In the first compensation speaker 41, the cavity
resonance phenomenon due to the capacity of the space enclosed by the reflector 42 limits the
radiation frequency to the required frequency range as well as the function of the network
circuit. It will be extremely good, so it will be 5 functions to adjust the balance between direct
sound and indirect sound.
If necessary, a sound absorbing material or the like may be disposed inside the reflection plate
(42) to change the-frequency characteristics. Also, the shape of the reflector is limited to that
described in the F embodiment, for example, if using the one of the square 52 with a square
shape as shown in FIG. Because it can be done, it will be diffused or even better. Furthermore, as
shown in FIG. The opening portion may be formed by forming a large number of holes 63 in the
rear surface of the spherical surface. In this case, the reproduction frequency characteristic of the
first compensation speaker 41 can be changed by the size of the hemisphere 62, the size of L68,
or the like. As described above, according to the present invention, it is possible to prevent the
reduction of indirect sound at a specific frequency in the space of a car, and it is possible to
achieve extremely excellent reproduction without passing through. It is a useful invention.
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description, jps57143781
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