JPH03216097

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DESCRIPTION JPH03216097
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system, and more particularly, to control of different characteristics of a loudspeaker by
the inherent characteristics of a diaphragm. [Summary of the Invention] The speaker system
according to the present invention comprises a plurality of independent driving force generating
units at different parts of a single diaphragm, and mutually related signals generated from the
same signal at the same time in each of the power generating units. In addition to this, by varying
each of these signals, it is possible to freely control the Sbiker characteristic which has been
determined based on the characteristic of the diaphragm itself. [Prior Art] When a signal is
applied to a speaker input terminal, a speaker system has various characteristics such as sound
pressure frequency characteristics, phase characteristics, directivity characteristics, group delay
characteristics, and transient response characteristics depending on the inherent characteristics
of the diaphragm. Was different. This is caused by the fact that the other diaphragm portion
makes a selfish movement according to the frequency since there is one drive portion of the
diaphragm. Therefore, in order to solve this problem, various speaker systems have been
proposed and implemented in which the diaphragm is driven at a plurality of points. An example
of such a speaker system in which the diaphragm is driven at a plurality of points is disclosed in
Japanese Patent Publication No. 61-15639. This speaker system is configured to use a square
plate as a diaphragm and drive the drive magnetic circuit at four positions, which are the
intersections of four nodes of the square diaphragm, for four-point driving. The signals applied to
the drive magnetic circuits are the same signal or the same signal different in level and are driven
by this signal. [Problems to be Solved by the Invention] The conventional multi-point drive
speaker system configured in this way is effective only in a specific frequency band, and is
particularly effective as a low-frequency speaker and has a narrow application range. . The
present invention has been made in view of the above-mentioned problems, and can freely
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control various characteristics such as frequency characteristics of Sbika determined based on
the inherent characteristics of the diaphragm, and flat frequency characteristics can be obtained
over the entire frequency band. It is an object of the present invention to provide a skier system
that improves the properties obtained. [Means for Solving the Problems] In order to achieve the
above object, in the speaker system according to the present invention, a plurality of independent
driving force generating units are disposed at different portions of a single diaphragm, and each
driving force generating unit Can be applied simultaneously to related signals generated from the
same signal, and by controlling the relative characteristics of the signals applied to the respective
driving force generating portions, control can be performed so that the skater characteristics
become the required characteristics. It is configured as follows.
[Operation] The speaker system of the present invention thus configured can freely control the
speaker characteristics which are determined based on the characteristics of the diaphragm
itself, and it is also possible to use the loudspeakers between the speaker systems using
diaphragms having different characteristics. Characteristics can be matched. Embodiments of the
present invention will be described below with reference to the drawings. First of all, FIG. 1
shows the first embodiment. First, this vibration system is, for example, a rectangular diaphragm
(1) having a honeycomb structure and a honeycomb structure, and an outer periphery of this
diaphragm (1). A plurality of voice coil bobbins (3) ((3a), (3b), (3c) 'J) and the respective voice
coil bobbins (3) bonded to the edge (2) bonded and the back surface of the diaphragm (1) The
voice coil (4) ((4a), (4b), (4c)) is wound around the outer periphery of the. The plurality of voice
coil bobbins (3) are arranged and adhered to the diaphragm (1) at substantially equal intervals.
On the other hand, the drive system is not shown because it is constituted by a magnetic circuit
consisting of a plate, a yoke, a permanent magnet and a center ball as well as a known drive
system. In the speaker system of this example configured in this manner, each voice coil (4)
wound around the voice coil bobbin (3) bonded to the diaphragm (1) in a plurality of separate
signal control circuits (5) (5a), (5b), (5c)] to be connected to the common signal generation circuit
S. That is, each signal control circuit (5a), (5b), (5c) connected to each voice coil (4a), (4b), (4c) is
connected in parallel to the signal generation circuit S, The signal control circuit includes filters
(6) [(6a), (6b), (6c)] and attenuators (7) ((7a), (7b), (7c)) and amplifiers (8) ((8a) , (8b), (8c) so that
the signal current from the signal generation circuit S can be separately controlled and supplied
to each voice coil (4). Thus, the loudspeaker system of this example has the voice coils (4) ((4a),
(4b), (4c)) at different positions of the diaphragm (1), ie, related to one another, generated from
the same signal at the drive point. A signal generated from the same signal applied to each
driving point so that a characteristic to be noticed by the speaker, for example, sound pressure
frequency characteristic, directional characteristic, phase characteristic, group delay
characteristic, transient response characteristic, becomes a characteristic to be obtained
simultaneously. The output sound pressure frequency characteristic can be flattened and
extended, and the transient response and the group delay characteristic can be improved.
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FIG. 2 shows a second embodiment of the present invention, which is a cone-sby force in which
the diaphragm is formed in a conical shape. The conical diaphragm (11) of the speaker system of
the present example forms an edge (12) on the outer peripheral edge and is supported via this
air (12). Then, a voice coil bobbin (13a) is adhered to the inner peripheral edge of the conical
diaphragm (11) to wind the voice coil (14a), and a voice is formed along the outer peripheral
portion and the middle portion on the back side of the diaphragm (11). A vibrating system is
configured by bonding the coil bobbins (13b) and (13c) and winding the voice coils (14b) and
(14c). The voice coil (14) C (14 a), (14 b), ((b)) is mounted on the voice coil bobbin corresponding
to each voice coil bobbin (13) C (13 a) (13 b) (13 c)) of this vibration system. A magnetic circuit
similar to that known as described above for 14 C)) is formed. Note that this magnetic circuit can
be formed commonly for each voice coil. And, each voice coil (14a), (14b) and (14c) of the
vibration system has the same signal generation circuit via the signal control circuit (15) [: (15a),
(15b) and (15c)] respectively. Connected to S. In the speaker system of this example configured
as described above, the signal current from the same signal generation circuit S is controlled for
each of the voice coils (14a), (14b), and (14c) as in the embodiment described above. (15a), (15b)
and (15c) can be separately controlled to be supplied, and the same characteristics as those of
the above-described embodiment can be obtained. In the present embodiment, the configuration
of each signal control circuit (15a) (15b), (15c) is configured in the same manner as the
embodiment described above, so the same reference numerals are given and detailed description
thereof is omitted. By configuring as in each of the above-described embodiments, the diaphragm
(IL (11) can be vibrated substantially integrally from the low tone range to the mid tone range
regardless of its shape, that is, flat plate shape, conical shape, etc. As shown in FIG. 3, the
frequency characteristic becomes flat, and in particular, the generation of the undulation of the
frequency characteristic in the midrange, that is, the so-called valley of midtone can be
suppressed, and the reproduction characteristic is improved. As mentioned above, although the
Example of this invention was described, this invention is not limited to this Example, It can
change variously in the range which does not deviate from the meaning of this invention. For
example, the driving force generating unit for the diaphragm, that is, the voice coil bobbin and
the signal system connected to the voice coil: 'The number of IU circuits can be increased or
decreased according to the size, shape, etc. of the diaphragm.
[Effects of the Invention] As described above, according to the present invention, a plurality of
independent driving force generating units are disposed at different portions of a single
diaphragm, and the respective driving force generating units are related to each other generated
from the same signal. The speaker characteristics determined based on the characteristics of the
diaphragm itself, because the speaker characteristics can be controlled to have the desired
characteristics by changing the relative characteristics of this signal while simultaneously adding
a certain signal. Characteristics such as sound pressure frequency characteristics, directional
characteristics, phase characteristics, group delay characteristics, and transient response
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characteristics can be freely controlled, and good reproduction characteristics can be obtained. In
addition, it is possible to cope with a plurality of skier systems having different characteristics of
the diaphragm, and it is possible to reproduce and play without discomfort even by combining
speaker systems having different characteristics.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an example of a speaker system according to the present invention,
FIG. 2 is a block diagram of the same and the other example, and FIG. 3 is a frequency
characteristic chart of an example.
In the figure, (1), (11) are diaphragms, (3) C (3a) to (3c), (13) ((13a) to (13c)) are voice coil
bobbins, (4) ((4a) to (4)) (4c), (14) [: (]. 4a) to (14c)) are voice coils, (5) ((5a) to (5c)), (15) ((15a)
to (15c)) are A signal control circuit, S is a signal generation circuit. Agent Matsushima Hidemori
15 IT Waiter 'IZl Composition 1'
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