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Description 1, title of the invention
3. Detailed Description of the Invention The present invention provides a speaker system free
from distortion caused by air non-linearity. 0 Conventional methods for reducing distortion in a
cis beaker system have been variously developed. However, all focused on distortion only in the
diaphragm and magnetic circuit constituting the speaker system, and distortion due to air nonlinearity was completely ignored. Therefore, there is a problem that the distortion rate of the
vibration velocity of the diaphragm does not fall below a finite distortion factor determined by
the aperture of the diaphragm or the like no matter how low the distortion is. In equation (1), a
circular diaphragm with an aperture of 2a vibrates in a purely sinusoidal manner in infinite
baffles, and the sound pressure at a receiving point 1 m apart is PCN / m ′ ′] It shows the
sound pressure second harmonic distortion rate. FIG. 1 shows the results of calculation of
equation (1) with P = 9 odB for a speaker with an aperture of 23.5 cm, 5.3 cm and 2.5 tyn. From
the calculation results of FIG. 1, it can be understood that the distortion factor limit due to air
non-linearity is higher than expected. In FIG. 2, the measured value of the second-order distortion
of the woofer with an aperture of 29 鍔 and the calculated value after correction of the
diffraction effect are also shown. It is apparent from FIG. 2 that the measured distortion factor is
the air distortion limit. As described above, as long as the air distortion limit exists, EndPage:
132, even if the reduction of the diaphragm and magnetic circuit constituting the key speaker
system, it is the principle to make the distortion factor of the entire speaker system zero. It was
impossible. The present invention solves this problem, and will be described below with
reference to the examples. A first embodiment of the present invention is shown in FIG. Two
speakers 1.2 having the same aperture are arranged, and the phase shift circuit 3 applies signals
of 900 different phases and x to each other. The air distortion at the sound receiving point 4 at
this time is x2 from one speaker 2 and A (i ′ ′) 2 = −Ax2 from another speaker 1, so adding
them together will be zero It will That is, second-order high adjustment distortion due to air nonlinearity is completely canceled out. On the other hand, the sum of the fundamental wave
disclosed in JP-A 54-160227 (2) is not zero at x (1 + j), so that the sound receiving point 4 can
hear a sound without air distortion. FIG. 4 shows a second embodiment, in which two speakers 5
and 6 having aperture sizes 2R1 and 2R2 are arranged side by side. In this case, the signal X is
applied to the speaker 5 having the aperture 2R1, and the signal j (R2 // R1) x is applied to the
speaker 6 having the aperture 2R2.
Then, the air distortion produced by each of the speakers 5 and 6 is x 2 from the above equation
(1), and the sum becomes zero 0. Also in this case, the sum of fundamental waves is not zero. You
can listen to no sound. FIG. 5 shows a third embodiment in which the two speakers 5 and 6 in the
second embodiment are coaxially arranged. FIG. 57 shows a fourth embodiment applied to a
horn speaker, in which sounds from two drivers 7.8 are synthesized inside the horn 9. FIG. 7
shows a fifth embodiment of the present invention, in which the speakers 2 and 2 are disposed
on both sides of the speaker 1 connected with the phase shift circuit 3 and the signal jx is
transmitted to the center speaker 1 , 2 to each of which signal X4 is applied. When two speakers
1 and 2 are arranged as shown in the embodiment of FIG. 3, the directivity becomes
asymmetrical on the left and right of the sound receiving point 4, but if the configuration is as
shown in FIG. Can be In the above description, in order to make the second-order air distortion
factor zero, signals different in 9o0 phase are used, but in general, signals different in phase
180o / n (n is an integer of 2 or more) are used. The nth-order air distortion factor can be made
zero. As described above, according to the present invention, two signals whose phases are
different from each other by 180γ n are applied to separate speakers, and the reproduced
sound of each speaker is spatially synthesized to achieve a pnn-order air distortion factor of zero.
Therefore, the distortion factor can be reduced beyond the theoretical limit of distortion that has
been considered impossible to overcome in conventional speaker systems. 0
4. Brief description of the drawings. FIG. 1 is a characteristic diagram showing calculated values
of air distortion, FIG. 2 is a characteristic diagram showing calculated values and measured
values of air distortion, and FIGS. It is a block diagram which shows the 1st-6th Example. 1.2, 5.6· · · · · · · · · · · · · · · · e phase shift circuit, 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · e phase shift circuit, 4 · · · · · · · · · · · · Name of agent
Attorney Nakao and others 1 person EndPage: 2 ← EndPage: 3 Fig. 5 Fig. 6 EndPage: 4
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