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DESCRIPTION JP2015095766

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DESCRIPTION JP2015095766
A speaker drive device capable of individually driving a large number of speakers with a simple
circuit configuration is provided. A speaker drive device 1 according to the present invention is a
speaker drive device 1 including a plurality of speakers SP connected in parallel to a pair of
output terminals of a direct current voltage source 30, wherein a multi-channel audio signal is
received by each of the speakers Control signal generation unit 10 for converting the control
signal to the control signal, and a plurality of control units 20 corresponding to the plurality of
speakers SP, wherein each control unit 20 corresponds to the high voltage side output terminal
of the DC voltage source 30 And a control unit disposed between each of the speakers and the
control unit for electrically connecting or disconnecting the DC voltage source and each of the
speakers based on the control signal. [Selected figure] Figure 1
Speaker drive device
[0001]
The present invention relates to a speaker drive device.
[0002]
Recently, as a next-generation three-dimensional acoustic system, a number of methods have
been proposed to realize a highly realistic sound reproduction by arranging a large number of
speakers in a room (Non-Patent Document 1).
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In addition, in order to easily use three-dimensional sound at home, a reproduction method using
a speaker array frame or the like in which a large number of speakers are arranged around a
television has also been devised (Non-patent Document 2).
[0003]
Ando, “High Presence Acoustic Technology and Its Theory,” IECE Fundamentals Review, Vol. 3,
No. 4, pp. 33-46, April 2010 T. Sugimoto, K. Matsui, and H. Okubo, “A Loudspeaker Array
Frame Reproducing 22.2 Multichannel Sound for Super Hi-Vision Flat Panel Display, "NAB Show
2012, Las Vegas, April 14-19, 2012.
[0004]
By the way, in general, a drive device for a speaker (hereinafter, referred to as an "amplifier" as
appropriate).
) Requires an amplifier for one channel per speaker. Therefore, as the number of reproduction
channels increases, the number of required amplifiers also increases proportionately, and an
increase in the size of the amplifiers is one of the problems for practical use of the threedimensional acoustic system. The
[0005]
Therefore, an object of the present invention made in view of such a point is to provide a speaker
driving device capable of individually driving a large number of speakers with a simple circuit
configuration.
[0006]
In order to solve the various problems described above, a speaker drive device according to the
present invention is a speaker drive device including a plurality of speakers connected in parallel
to a pair of output terminals of a direct current voltage source, A control signal generation unit
configured to convert a control signal to a speaker, and a plurality of control units corresponding
to the plurality of speakers, wherein each control unit is a high voltage side output terminal of
the DC voltage source; And a control unit which connects or disconnects the DC voltage source
and the speakers based on the control signal.
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[0007]
The present invention provides a speaker driving device capable of individually driving a large
number of speakers with a simple circuit configuration.
[0008]
It is a figure showing composition of speaker drive 1 concerning one embodiment of the present
invention.
[0009]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0010]
FIG. 1 is a view showing the configuration of a speaker drive device 1 according to an
embodiment of the present invention.
The speaker drive device 1 includes a control signal generation unit 10, a plurality of control
units 20 (control units 20 1 to 20 N), a DC voltage source 30, and a plurality of speakers SP
(speakers SP 1 to SP SP). And
N represents the number of speakers, and each control unit 20 x (1 ≦ x ≦ N) corresponds to
each speaker SP x.
In the following description, for the sake of simplicity, for each control unit 20 x and each
speaker SP x, a notation without any suffix (control unit 20, speaker SP) is used as appropriate.
In addition, the multi-channel acoustic signal of the three-dimensional acoustic system input to
the speaker driving device 1 is, for example, a 22.2 acoustic signal which is super hi-vision
acoustic, a 5.1 channel acoustic signal used in home theater or digital broadcasting, It is an
acoustic signal of various multi-channel acoustic systems.
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[0011]
The control signal generation unit 10 is a processor that processes an acoustic signal, and
converts the input multi-channel acoustic signal into a control signal for each speaker SP.
Specifically, the control signal generation unit 10 is configured to control each speaker SP (Pulse
Width Modulation), PDM (Pulse Density Modulation) modulation, DSD (Direct Stream Digital,
registered trademark) method, etc. of a multi-channel audio signal. The low-pass filter is
converted to a control signal of a modulation scheme that can demodulate the original analog
signal. The control signal generation unit 10 outputs the converted control signal to the control
unit 20 corresponding to each channel.
[0012]
The control signal generation unit 10 can adjust the control signal for each speaker SP by a
predetermined ratio in order to adjust the volume of each speaker SP individually. For example,
when the control signal is a pulse signal of PWM modulation, the control signal generation unit
10 adjusts the pulse width to the speaker SP to increase the volume by a predetermined ratio,
and adjusts the pulse width to the speaker SP to reduce the volume by a predetermined ratio. can
do. In addition, it is possible to perform volume adjustment of each speaker SP as initial setting at
the time of speaker installation, and to carry out dynamically according to the multichannel
acoustic signal to reproduce | regenerate.
[0013]
The plurality of control units 20 correspond to the plurality of speakers SP, and each control unit
20 is disposed between the high voltage side output terminal (hot) of the DC voltage source 30
and the corresponding speaker SP. Based on the control signal from the control signal generation
unit 10, the DC voltage source 30 and the speakers SP are electrically connected or disconnected.
The control unit 20 is a switching element such as a transistor or a thyristor, and preferably has
a predetermined switching frequency (for example, about 100 kHz for PWM, about 1 MHz for
PDM modulation, and about 3 MHz for DSD modulation) And an arbitrary switching element
corresponding to a predetermined power (about 10 w for an electrodynamic speaker with a
diameter of about 10 cm).
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[0014]
The DC voltage source 30 applies a constant voltage to each speaker SP connected in parallel to
the pair of output terminals, and the high voltage side output terminal (hot) is connected to each
speaker SP via the corresponding control unit 20. Connected, the ground terminal (ground) is
directly connected to each speaker SP. The direct current voltage source 30 is not limited to a
constant voltage source, and may be a variable voltage source.
[0015]
The plurality of speakers SP are connected in parallel to a pair of output terminals of the DC
voltage source 30, and each speaker SP is an original multi-channel acoustic signal from pulse
signals supplied by the on / off operation of the corresponding control unit 20. Demodulates and
reproduces an analog signal. The speaker SP is, for example, an electrodynamic speaker, and in
this case, since the electric circuit has resistance and inductance, even if a pulse signal is input,
the speaker SP does not respond as it is, and a signal passing through a low pass filter As it is
output, the original analog signal is demodulated at the speaker. As the target speaker to be
driven, not only an electrodynamic speaker but also an electronic circuit capable of forming a
low-pass filter in electric circuit can be driven, so an electromagnetic speaker, a piezoelectric
speaker, an electrostatic speaker, etc. are also used. It goes without saying that it is possible.
[0016]
As described above, according to the present embodiment, the control signal generation unit 10
converts a multi-channel acoustic signal into a control signal for each speaker SP, and the high
voltage side output terminal of the DC voltage source 30 and the corresponding speaker SP Each
control unit 20 disposed between the terminals conducts or cuts off between the DC voltage
source and each speaker based on the control signal. This makes it possible to individually drive
a large number of speakers with a simple circuit configuration and demodulate and reproduce an
analog signal which is an original multi-channel acoustic signal. That is, since it is sufficient to
control the power supply from one DC voltage source 30 to the plurality of speakers SP by the on
/ off operation of the control unit 20 which is a switching element, it is necessary to provide an
individual amplifier for each speaker as in the prior art. There is no According to the present
invention, it becomes possible to realize a small-scale speaker driving device capable of
individually driving a large number of speakers, and to easily use a next-generation three-
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dimensional sound system using a large number of speakers in general homes and the like.
Become.
[0017]
Although the present invention has been described based on the drawings and examples, it
should be noted that those skilled in the art can easily make various changes and modifications
based on the present disclosure. Therefore, it should be noted that these variations and
modifications are included in the scope of the present invention. For example, functions included
in each functional unit can be rearranged so as not to be logically contradictory, and it is possible
to combine or divide a plurality of functional units into one.
[0018]
DESCRIPTION OF SYMBOLS 1 Speaker drive device 10 Control signal generation part 20 (20 120 N) Control part 30 DC voltage source SP (SP 1-SP N) Speaker
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