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JPS54134026

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DESCRIPTION JPS54134026
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional
speaker system, and FIG. 2 and FIG. 3 are sectional views showing different embodiments of the
speaker system according to the present invention, Fig. 4 is a chart showing harmonic distortion
characteristics according to the prior art, Fig. 5 is a chart showing harmonic current distortion
characteristics according to the prior art, and Fig. 6 is a chart showing high frequency distortion
characteristics according to the illustrated embodiment of the present invention. FIG. 7 is a chart
showing high frequency current distortion characteristics of the same embodiment.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system having a plurality of electrodynamic loudspeakers for reducing harmonic distortion,
especially second harmonic distortion as much as possible. Although the electrodynamic speaker
generates harmonic distortion, current distortion in the magnetic circuit is one of the reasons for
the generation. This is because when the voice coil moves in the magnetic gap due to the
electrical input, the current flowing through the voice coil is distorted by the magnetic nonlinearity in the vicinity of the coil and the radiated sound is also distorted. It generates harmonic
distortion. However, conventionally, in a speaker system using a plurality of electrodynamic
speakers, as shown in FIG. 1, if all the speakers (two in the figure) A and B are oriented in the
same direction and mounted in the cabinet C, Since two voice coils are connected by means of
series, parallel, etc. so that the diaphragms of V (, two speakers A and H vibrate in the same
direction, harmonic distortion of two speakers A 1 B, In particular, the second harmonic
distortion has the disadvantage of being synergistically increased-the harmonic distortion
characteristic according to this prior art example is shown in FIG. 4 and the harmonic current
distortion characteristic is shown in FIG. In the above characteristic chart, ■ indicates the
fundamental wave, ■ indicates the second harmonic distortion, X indicates the fundamental
current, Y indicates the second current distortion, but the second harmonic distortion ■
indicates only 20 dB, and In the present invention, the purpose is to solve the above-mentioned
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disadvantages of the prior art, that is, at least the magnetic circuit and the voice coil have the
same structure. Divide the even number of spins (2) and “7 · ′ ′ one force into two, attach
half of the speakers in the opposite direction, and make each voice coil so that the diaphragms of
all the speakers can vibrate in the same direction. By series connection, parallel connection, etc.,
current distortion or magnetostriction generated due to the relationship between the magnetic
circuit and the voice coil can be mutually canceled to eliminate harmonic distortion, especially
second harmonic distortion as much as possible. Try to reduce it to FIG. 2 shows an embodiment
of the present invention, in which an even number (two in the figure) of speakers 1aJ1b having
the same structure as the magnetic circuit and the voice coil is divided into two. The speakers 1m
and 1b are attached to the pan full 2a of the cabinet 2 so that the opening directions of the
diaphragms are opposite to each other. Therefore, one of the speakers 1a has a listening
direction 0 like a normal speaker. The other speaker 1 b is mounted toward the inside of the
cabinet 2. Then, the speakers 1a and 1b are connected in series as indicated by solid lines in the
input terminals 3 and 4 of one voice coil so that the diaphragms can vibrate in the same
direction, or (3) a dotted line or series parallel indicated by dotted lines. Etc., 5 is an electric wire
for connection, and 6 is an input terminal.
In other words, in the other embodiment of the present invention, the inside of the cabinet 2 is
divided by the baffle 2b into two chambers 7m, in the other embodiment of the present
invention. 2b, one speaker 1a is attached to the baffle 2m, and the other speaker lb is attached to
the partition baffle 2b so that the opening direction of the diaphragm is reversed as described
above, FIG. The other points are completely the same except for the embodiment of FIG.
Therefore, when the electric power is applied to the input terminal 6, both diaphragms 1a and 1b
vibrate in the same direction, so the fundamental wave is synergistically increased, while both
voices 1a and 1b voice coils Since the magnetic circuit has the same structure, it moves in the
opposite direction with respect to the magnetic gap, and the current distortion generated from
the connection between the magnetic circuit and the voice coil is beaten (4) and the second
harmonic Is greatly reduced with respect to the fundamental wave. This experimental
characteristic is shown by the high frequency distortion characteristic of FIG. 6 and the high
frequency current distortion characteristic of the off diagram. In the characteristic diagram, ■
indicates the fundamental wave, ■ indicates the second harmonic, X indicates the fundamental
current, Y indicates the second current distortion, but the second harmonic distortion ■
indicates only 20 dB, and the second current distortion Y The company is shown increasing by
30 dB. The third harmonic distortion can be reduced together if the IJ song is installed on the
poles of the magnetic circuit of the speakers la and lb. Since the present invention is configured
as described above, harmonic distortion, particularly second harmonic distortion can be reduced
as much as possible without affecting the fundamental wave when using an even number of
speakers . The present invention can be applied to all speaker systems using an even number of
speakers, such as a speaker / stem for bass, a system for mid-sound, or a speaker system using a
plurality of speakers such as tone zone. Of course, it is applicable.
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