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簀 specification 簀 1, title of the invention
Broadband directional speaker system
! Detailed Description of the Invention The present invention operates a wide band NR
directional speaker system 117 ft, D, t) an outer speaker at low frequencies, and an inner speaker
'fc セ operation at a higher frequency. The purpose of this is to provide a loudspeaker system t ′
′ tiger which can sometimes sharpen the directivity in the frequency domain. Play with f パ イ t
speakers using pinaural ball sounds (hereinafter referred to as dummy head recording) using a
microphone provided on a dummy head (pseudo fi)-Two places in a no- # room and playback is
difficult for forward localization with headphones It becomes clear and ρ can be placed on the
outside of the speaker and between the listener and the speaker in a natural manner. However, if
you go to 2 rooms in an employed room, you will be able to reach the listener directly from the
speakers, and it will be reflected indirectly on the floor, the ceiling, etc. The natural t-law can not
be obtained as compared to the habit of playing in. So, dummy head recording? -One method of
playing a loudspeaker in a room with a well-designed loudspeaker is to use a directional sharp
speaker to reduce the demagnetization f by 100 million. EndPage: 1 method. -In general, the
directivity of the surface sound source type 'sbi'-force arranged on a virtual surface of a swash
plate is determined by the distance between the large speakers, the aperture size of the speakers,
the operation volume level and the like. Here, when the radius gold a1 wavelength of the speaker
is λ and the radiation low ratio is R8, generally, a disk sound is generated. From this equation,
the larger (smaller) the aperture of the speaker has directivity from the low tone range (high tone
range), and the interval between these speakers is larger when operated at the same volume level
of 12 single speakers. It can be seen that the directivity is obtained from the lower range (higher
range) as it is smaller (small). Therefore, the operation sound t level of the speaker disposed
outside of the high power sound signal of any skill number fire field is made larger than the
operation sound level of the speakers arranged in 11111. If you let the direction from the low
range become sharper, it will be in the middle range and a large side rope will come out, so this
side rope will be small for practical use Ino This side rope is placed on the medium fire and the
speaker's operating volume level In order to give directivity t in the low frequency range as well
as in the low sound area, it is necessary to use the same speaker as in The external shape of the 9
speaker system must be made into a large size 1c41 on a paper sheet of paper to increase the
diameter of the cuspid force made to the human body.
However, when it was built like this, the whole system of Sysdem was large, and the imperial cap
became a person 1C. The non-invention provides a speaker system ftm which can be sharpened
even in the range of ict to -i without making the outside of the speaker 7 stem wide, without
making the outside of the speaker 7 stem large. Fig. 1 shows an uninvented point-to-point
speaker system with a speaker system 1M 1? The outline front view of lI is shown. In the figure,
S, S8 are speakers for the low frequency range, 82 to. s7 is a speaker% B for middle frequency
range, and a speaker for high frequency range. Speakers B1 and 88 are arranged outside the
entire speaker system? The speakers 82 to S7 are disposed inside the entire speaker system. The
apertures of the speakers S to S8 are all the same, and the aperture of the 9% speaker S is
smaller than the apertures of the speakers S to s8. な2.1はスピーカボックスである。 Here,
the speakers S, S 8 operate at the same operation tt level 29, the distance 111 between these
degrees 111! 14! Then, as shown in FIG. 2, the speakers S, S2 and S8 are two speakers 60 m
on the same axis m from the @C. Sounds emitted from S8 cancel each other when the distance of
AB darkness on the axis m, that is, Jdn 60 ° is a half wavelength, and strengthens each other
when A 'dn 60 ° is one wavelength. Therefore, when the distance between A and B is a number
corresponding to l wavelength, the back pressure on the axis m is equal to the back pressure on
@C, and the directivity at Shigakami, @Iljim Not in. The frequency at this time is 340 XIO, ≠.
A'IdH60 Therefore, the cross of the signal supplied to the Wti wave · 340 X 102 number without
directivity in the direction of 60 ° among the frequencies of the sound radiated from the
speakers S, S8, ie, to the speaker s 27s, 88 with the speaker s 27s If added to the over frequency,
the speakers S, S8 have directivity at frequencies lower than that. Therefore, as described above,
it is sufficient to increase the volume level of the outer speaker in order to make directivity more
than the low frequency range, and to increase directivity in the middle frequency range, it is
necessary to increase the it level of the inner speaker In order to have directivity in the low
frequency range below this crossover frequency, it is better to do so: outer surface: force 8. What
is necessary is just to make it + SBklIJ, and in order to give directivity in a sound range above this
crossover frequency, it is sufficient to operate the inner speakers 82 to S7. In FIG. 1, if l is set to
50 cIn in advance, the speaker S4.
The frequency at which the sounds of S8 and p340 X 102 intensify each other is 800 (Hz) in '50
X 5 b 1600, and this frequency adds up to the total calculated crossover frequency. However, in
practice, because the characteristics of the filter radiate some sound even at this frequency or
less than this frequency, the speaker S and the frequency of 800 Hz to prevent interference with
everyone radiating from S8. Define a slightly higher 1jCHz as the actual crossover frequency.
Thus, if lKf7 is defined as the actual crossover frequency, the directivity in the bass range of the
speakers S and S8 is assured. In addition, as for Ide which is% 60 ° same direction t, generally in
the direction such as 30 ° and 60 ° from the middle axis C is used as the reference of EndPage:
2 and the low range and the mid range Since one straight line of the crossover frequency of is
determined to be a predetermined value, cold summer from which the value of the
predetermined crossover frequency can be calculated is around 60 ° when l is determined in
advance. FIG. 3 shows a circuit diagram of the inventive speaker system. In the figure, the same
components VC as those in FIG. In the figure, 2.2 'is a back door signal input terminal through a
low pass filter 3 of 12 dB 10 CT at cutoff frequency ael KHz, a band pass filter 4 of pass band
load mantissa 1-10 KHz and a high pass filter of cutoff frequency 10 KH2. Large speaker S1. S8
is connected to the speakers 82 to S7 and the speaker S9. Here, when only the speakers S and S8
are operated at the same volume level and 7'C (song ml), and only the speakers S2 to S7 are
operated at the same volume level (curved curve 2), the speakers S to S8 Each sound pressure
level t-m4 on @m of (Song Nm) in the case of operating at the same volume level is shown in FIG.
Note that the volume levels of the valley speakers are all the same value. 0 In this case, the
speaker S. When all of S1 to S8 are operated (song -1 [[), the speaker S4. When only the S8 is
operated (in particular, the sounds from the speakers are intensified with each other at low
frequencies, as compared with the curve, so that the directivity becomes wide. Therefore, as
apparent from the figure, assuming that the frequencies when 6 dBt is lowered in the songs M1
to M2 are f, * f2 and fB, the frequency f1 when all the speakers S, a are operated is the speaker s,
lower than the frequency f when operating Ls8. Therefore, if you operate the outer-speaker,
beaker 81 + 86t-to the lower frequency band of the audio signal, the lower limit of the lower
frequency with sharp directional gold can be extended, so that the whole system is sharp pointed
over a wide band You can get sex.
The tgs diagram shows respective directivity characteristics of the speaker system and the
speaker system of the present invention when all the speakers 81 to s8 are operated at the same
volume level. In the figure, the characteristics when the speakers S to S6 are all operated at the
same volume level as in the prior art are shown on the left side around the central axis k, and the
characteristics of the speaker system of the present invention are shown on the right side. In
general, the directivity% ratio curve of the speaker is substantially symmetrical with respect to
the whole center of Wang @ 0, so that in FIG. 10, only one side of each characteristic am is
shown in FIG. More clearly, in the t range such as 300 Hz, 400 Hz and 500 Hz, the speaker
system according to the present invention has sharper directivity compared to the case where
the speaker S is operated at ˜ S8S i volume level O In the method of increasing the volume level
of the speakers arranged in the middle fire as described above and reducing the volume level of
the sliding force arranged on the outer side to a small amount, the side lobe in the cp back region
is reduced. It is difficult to provide directivity in the low range, but as in the speaker system of
the present invention, the outer speaker is operated in the low range and located at the center of
the inner beaker t- □ in the higher range. If the loudness level of the ゐ speaker is increased,
directivity characteristics with less side ropes can be obtained in a wider band. In addition, the
arrangement of valley speakers is not limited to the state as shown in FIG. 1. For example, all
Sublite sensors may be disposed on a straight line in the left-right direction to have a 7c
configuration. The inner speakers may be arranged in a substantially concentric manner. As
described above, the broad band I-homosexual speaker system, which will be the brother #JA,
connects a low-pass filter between the external speaker and the input terminal, and (iii) the
speaker and the input terminal Ω + n) VC: Connect a filter that M passes the lower frequency
band above the low pass filter, and operate the outer speaker for the load wave number, and for
the frequency of the band higher than this frequency, Since the speaker is configured to operate
in the inner side, it is possible to make the directivity sharp from the bass region without
increasing the diameter of the speaker and the valley speed, so that all the speaker gold turnssound t The lower limit of the frequency with sharp directivity can be extended compared to the
case of operating at the level, and therefore the speed in reproducing the dummy head sound
that requires sharp homology, especially over a wide band Having characteristics equal are the
most suitable system.
4, Brief description of the figure EndPage: 3 Fig. 1 is a schematic front view of the first
application 1j of the wide-firefly area finger co-injection speaker system according to the present
invention, and Fig. 2 is a principle of the speaker system shown in Fig. 1 The third diagram is a
circuit diagram of the speaker system shown in FIG. 1, and the fourth diagram is a diagram of the
speaker system shown in FIG. The speaker system of the present invention and the directivity
characteristic diagram of people of the speaker system of the present invention. S-+-8 L1 · · ·
Speaker, 3- · · · low pass filter, 94 · · e @ pass filter, 5 · · II low pass filter. Patent applicant Sun
Invicta Co., Ltd. I Sat agent 升 Filled soil Ito General Counseling Fig. 2 Ni JC + L /) Lnt /) One] · · ·
0 ° C EndPage: 4