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JP2004221748

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DESCRIPTION JP2004221748
An acoustic signal amplifier capable of dividing an acoustic signal into bands without
complicated connection and setting between devices. An input terminal (101, 102, 103, 104) for
inputting an acoustic signal from the outside, a high frequency acoustic signal of a frequency
band higher than a predetermined reference frequency and a frequency band lower than the
reference frequency Low-pass acoustic signal polarity inverting means 115 for inverting the
polarity of the low-pass acoustic signal to generate a reverse-phase low-pass acoustic signal;
Output driver 131, 132, 133, 134 for driving a speaker connected to the output terminals 141,
142, 143, 144 based on the amplified audio signal and a low-pass audio signal, a high-pass audio
signal And the low-pass acoustic signal is amplified by the output driver, or selected by the
selection means 120 which causes the output driver to amplify the acoustic signal input from the
outside. It is. [Selected figure] Figure 1
Acoustic signal amplifier
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic signal amplifier that amplifies an acoustic signal and drives a speaker to amplify the
acoustic signal. 2. Description of the Related Art Heretofore, as this kind of acoustic signal
amplifier, one as shown in FIG. 3 is known. The conventional audio signal amplifier 300 has a
first input terminal 301, a second input terminal 302, a third input terminal 303, a fourth input
terminal 304 for inputting an audio signal from an external device. First polarity inverting means
305 for inverting the polarity of the acoustic signal inputted to the first input terminal 301, the
signal outputted by the first polarity inverting means 305 and the acoustic signal inputted to the
second input terminal 302 Of the first signal selecting means 306 for selecting any one of the
signals; second polarity reversing means 307 for reversing the polarity of the acoustic signal
input to the third input terminal 303; second polarity reversing means A second signal selection
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unit 308 for selecting any one of the signal output by 307 and the acoustic signal input to the
fourth input terminal 304; amplifying the amplitude of the input signal; The The first output
driver 331, the second output driver 332, the third output driver 333, the fourth output driver
334 for driving the speaker, and the first output terminal 341 to which the speaker is connected,
the second output terminal 342, a third output terminal 343, and a fourth output terminal 344.
According to this configuration, it is possible to amplify the amplitude of the input acoustic signal
and drive the connected speaker. Here, in general, a speaker configuration in a system that
transmits and transmits an acoustic signal includes a configuration in which a signal of an entire
frequency band is amplified by a speaker for an entire band, a speaker for low-frequency
amplification in a low frequency band signal , Called a subwoofer. There is a configuration to
add). Further, when a loudspeaker system is configured by the above-described full-band speaker
and subwoofer, it is possible to suppress the occurrence of interference between loudspeaker
loudspeakers and drive the loudspeakers in a band other than the original loudspeaker band of
each loudspeaker. The subwoofer is a signal component of the low frequency band signal
component of the subwoofer loud band component for the purpose of preventing the destruction
of the speaker by the cause, and the full band speaker is the band division signal of the band
component higher than the subwoofer loud band Supply and drive the speakers. The band
dividing device 350 is a device capable of band-dividing and supplying an acoustic signal.
The band dividing device 350 blocks passage of signal components in a frequency band lower
than or equal to a predetermined frequency of the input acoustic signal and the fifth input
terminal 351 and the sixth input terminal 352 which input stereo audio signals from an external
device. The first high-pass filter 311, the second high-pass filter 312, the monaural addition
means 313 for adding the acoustic signal inputted to the fifth input terminal 351 and the sixth
input terminal 352, the inputted sound A low pass filter 314 for blocking passage of signal
components in a frequency band higher than a predetermined frequency of the signal, a fifth
output terminal 353 for outputting the signal passed through the first high pass filter 311 to the
outside, a second The sixth output terminal 354 outputs the signal that has passed through the
high pass filter 312 to the outside, and the seventh output terminal 355 that outputs the signal
that has passed through the low pass filter 314 to the outside Thus constructed. The stereo
sound signal which has been band-divided by the band division device 350 is supplied to the
sound signal amplifier 300. For example, a high frequency band acoustic signal is input to the
first input terminal 301 and the second input terminal 302, and the amplitude is amplified by the
first output driver 331 and the second output driver 332, The sound is amplified by the output
terminal 341, the first full band speaker 401 connected to the second output terminal 342, and
the second full band speaker 402. A low frequency band acoustic signal is input to the third
input terminal 303, and the amplitude is amplified by the third output driver 333 and the fourth
output driver 334, and the third output terminal 343, The sound is amplified by the low band
speaker 403 connected to the fourth output terminal 344. At this time, the low frequency
acoustic signal is inverted in polarity by the second polarity inverting means 307 and input to
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the fourth output driver 334. By the configuration of such an acoustic signal amplifier 300 and
the band dividing device 350, the band-divided acoustic signal is amplified. [0009] Since such
prior art does not relate to a document known invention, there is no prior art document
information to be described. However, in such a conventional acoustic signal amplifier, an
apparatus capable of band-dividing and supplying an acoustic signal when the acoustic signal is
band-divided and amplified. Because of the need to connect the devices and the complexity of the
connection and setting between the devices, there has been a problem that the connection
between the devices and the setting may be incorrect, resulting in an accident that the speaker
may be broken.
The present invention has been made to solve such a problem, and provides an acoustic signal
amplifier capable of dividing an acoustic signal into bands without complicated connection and
setting between devices. It is. According to the acoustic signal amplifier of the present invention,
a high-frequency acoustic signal in a frequency band higher than a predetermined reference
frequency and an acoustic signal input from the outside are lower than the reference frequency.
Band division means for dividing into low-pass acoustic signals of a frequency band, low-pass
acoustic signal polarity inversion means for reversing the polarity of the low-pass acoustic
signals to generate reverse-phase low-pass acoustic signals, and the high-pass acoustic signals
And an output driver for amplifying the low-pass acoustic signal and driving a speaker connected
to the outside according to the amplified signal. According to this configuration, since the band
division and amplification function is provided internally, it is possible to eliminate complicated
connection and setting between the devices when the sound signal is divided into bands and
amplified. It is possible to prevent low frequency speakers from BTL driving by preventing an
accident that the speakers are broken due to an error in connection and setting between devices.
Further, in the acoustic signal amplifier according to the present invention, the band dividing unit
externally inputs a first acoustic signal and a second acoustic signal as the acoustic signal from
among the first acoustic signals. A first high-pass acoustic signal of a frequency band higher than
a predetermined reference frequency is selectively passed, and a second high-pass acoustic
signal of a frequency band higher than the predetermined reference frequency among the second
sound signals Are selectively passed, and a summed acoustic signal which is a signal obtained by
adding the first acoustic signal and the second acoustic signal is generated, and a frequency band
lower than the predetermined reference frequency among the summed acoustic signals is
generated. And the high-pass acoustic signal is made up of the first high-pass acoustic signal and
the second high-pass acoustic signal. According to this configuration, since the band division and
amplification function corresponding to the stereo sound signal is provided internally, when the
stereo sound signal is divided and banded, complicated connection and setting between the
devices are eliminated. It is possible to BTL drive low frequency speakers by preventing an
accident that the speakers are broken due to an error in connection and setting between devices.
Further, in the acoustic signal amplifier according to the present invention, it is selected whether
the high frequency acoustic signal and the low frequency acoustic signal are amplified by the
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output driver or the acoustic signal input from the outside is amplified by the output driver. The
output driver has a configuration for amplifying a signal selected by the selection means and
driving a speaker connected to the outside according to the signal obtained by amplification.
There is.
With this configuration, it is possible to collectively set whether or not to execute band division
amplification, and therefore, the present invention is applicable to an acoustic signal
amplification system that does not use the internal band division amplification function. Further,
the acoustic signal amplifier according to the present invention has a configuration including a
polarity inverting means for inverting the polarity of the acoustic signal input from the outside.
According to this configuration, it is possible to invert the polarity of the input acoustic signal, so
that it is possible to BTL drive the low frequency speaker by inputting the acoustic signal which
is band-divided by the external device. BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a diagram showing a schematic block configuration of an acoustic signal
amplifier according to a first embodiment of the present invention. The acoustic signal amplifier
100 includes a first input terminal 101, a second input terminal 102, a third input terminal 103,
a fourth input terminal 104, and a first input terminal for inputting an acoustic signal from an
external device. Either the first polarity inverting means 105 for inverting the polarity of the
acoustic signal inputted to 101 or any one of the signal outputted by the first polarity inverting
means 105 and the acoustic signal inputted to the second input terminal 102 Output by the first
signal selection means 106 for selecting one of these signals, the second polarity inversion
means 107 for inverting the polarity of the acoustic signal input to the third input terminal 103,
and the second polarity inversion means 107. A second signal selection means 108 for selecting
any one of the signal and the acoustic signal inputted to the fourth input terminal 104; signal
components of frequency bands below a predetermined frequency of the inputted acoustic signal
A first high-pass filter 111 for blocking excess, a second high-pass filter 112, a monaural
addition means 113 for adding acoustic signals input to the first input terminal 101 and the
second input terminal 102; A low pass filter 114 for blocking passage of signal components in a
frequency band higher than a predetermined frequency of the input acoustic signal, a third
polarity reversing means 115 for reversing the polarity of the signal output by the low pass filter
114, Signals to be amplified by the first output driver 131, the second output driver 132, the
third output driver 133, and the fourth output driver 134, which will be described later, may be
high band acoustic signals and low band acoustic signals, or externally input Selection means
120 for selecting whether to use the output sound signal, a first output driver 1 for amplifying
the amplitude of the input signal and driving the connected speaker 1 1, second output driver
132, third output driver 133, fourth output driver 134, first output terminal 141 to which a
speaker is connected, second output terminal 142, third output terminal 143, the fourth It is
comprised by the output terminal 144 of four.
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The first high-pass filter 111, the second high-pass filter 112, the monaural addition means 113,
and the low-pass filter 114 make an acoustic signal input from the outside higher than a
predetermined reference frequency. A band dividing unit configured to divide into a high
frequency band high frequency sound signal and a low frequency band low frequency sound
signal lower than the reference frequency is configured. The third polarity reversing means 115
constitutes low-pass acoustic signal polarity reversing means for reversing the polarity of the
low-pass acoustic signal to generate a reverse-phase low-pass acoustic signal. A first acoustic
signal is input to the first input terminal 101 by an external device, and the first input terminal
101 receives the first acoustic signal as a first audio signal. The signal is output to the polarity
inverting means 105, the first high pass filter 111, the monaural addition means 113 and the
selection means 120. A second acoustic signal is input to the second input terminal 102 by an
external device, and the second input terminal 102 receives the second acoustic signal as a first
audio signal. It is output to the signal selection means 106, the second high pass filter 112 and
the monaural addition means 113. A third acoustic signal is input to the third input terminal 103
by an external device, and the third input terminal 103 receives the input third acoustic signal as
a second audio signal. The data is output to the polarity inverting means 107 and the selecting
means 120. A fourth acoustic signal is input to the fourth input terminal 104 by the external
device, and the fourth input terminal 104 receives the input fourth acoustic signal as a second
audio signal. It is outputted to the signal selection means 108. The first acoustic signal output
from the first input terminal 101 is input to the first polarity inverting means 105, and the first
polarity inverting means 105 receives the input. The polarity of the first acoustic signal is
inverted to generate a first negative-phase acoustic signal, and the generated first negative-phase
acoustic signal is output to the first signal selection means 106. The first signal selection means
106 receives the first opposite phase acoustic signal output from the first polarity inverting
means 105 and the second acoustic signal output from the second input terminal 102. It is
supposed to be The first signal selection means 106 selects any one of the input first anti-phase
sound signal and the second sound signal, and outputs the selected signal to the selection means
120. It is supposed to be.
In the following description, the signal selected by the first signal selection unit 106 is referred to
as a first selection signal. Here, for example, the first signal selection unit 106 includes a terminal
connected to the second input terminal 102, a terminal connected to the first polarity inversion
unit 105, and a fourth signal selection unit 122. The first reverse-phase acoustic signal input by
switching the connection between either the second input terminal 102 or the first polarity
inverting means 105 and the fourth signal selecting means 122, having a connected terminal
And any one of the second acoustic signals may be selected, and the selected signal may be
output to the selection means 120. The third acoustic signal output from the third input terminal
103 is input to the second polarity inverting means 107, and the second polarity inverting means
107 receives the input. The polarity of the third acoustic signal is inverted to generate a second
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negative-phase acoustic signal, and the generated second negative-phase acoustic signal is output
to the second signal selection means 108. The second signal selection means 108 receives the
second opposite phase acoustic signal output from the second polarity inverting means 107 and
the fourth acoustic signal output from the fourth input terminal 104. The second signal selection
means 108 selects and selects one of the input second anti-phase sound signal and the fourth
sound signal. A signal is output to the selection means 120. Here, for example, the second signal
selection unit 108 includes a terminal connected to the fourth input terminal 104, a terminal
connected to the second polarity inversion unit 107, and the sixth signal selection unit 124. The
second reverse-phase acoustic signal input by switching the connection between either the fourth
input terminal 104 or the second polarity reversing means 107 and the sixth signal selecting
means 124, having a connected terminal And any one of the fourth acoustic signals may be
selected, and the selected signal may be output to the selection means 120. In the following
description, the signal selected by the second signal selection unit 108 is referred to as a second
selection signal. The first high-pass filter 111 receives the first acoustic signal output from the
first input terminal 101, and the first high-pass filter 111 receives Block the signal component of
the frequency band below the predetermined frequency of the first acoustic signal, and pass only
the signal component of the frequency band above the predetermined frequency of the first
acoustic signal to output to the selection means 120 It is supposed to be.
In the following description, the first acoustic signal that has passed through the first high-pass
filter 111 is referred to as a first high-pass acoustic signal. Also, the predetermined frequency
may be set in advance or may be set by an external device. The second high-pass filter 112
receives the second acoustic signal output from the second input terminal 102, and the second
high-pass filter 112 receives Block the signal component of the frequency band below the
predetermined frequency of the second acoustic signal, pass only the signal component of the
frequency band above the predetermined frequency of the second acoustic signal, and output it
to the selection means 120 It is supposed to be. In the following description, the second acoustic
signal passed through the second high pass filter 112 is referred to as a second high frequency
acoustic signal. Also, the predetermined frequency may be set in advance or may be set by an
external device, and the first high pass filter 111 and the second high pass filter 112 have the
same pass frequency. It shall have the characteristics. The first sound signal output from the first
input terminal 101 and the second sound signal output from the second input terminal 102 are
input to the monaural addition means 113. The monaural addition means 113 performs
monaural addition of the input first acoustic signal and second acoustic signal to generate an
addition acoustic signal, and outputs the generated addition acoustic signal to the low pass filter
114. It is supposed to be. The low pass filter 114 is configured to receive the addition acoustic
signal output from the monaural addition unit 113, and the low pass filter 114 has a frequency
equal to or higher than a predetermined frequency of the input addition acoustic signal. The
signal component in the frequency band is cut off, and only the signal component in the
frequency band below the predetermined frequency of the added acoustic signal is passed to be
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output to the third polarity reversing means 115 and the selecting means 120. In addition, in the
following description, the thing of the addition acoustic signal which passed the low-pass filter
114 is called a low-pass acoustic signal. The predetermined frequency may be set in advance or
may be set by an external device. Furthermore, the pass frequency characteristic of the low pass
filter 114 is set based on the pass frequency characteristics of the first high pass filter 111 and
the second high pass filter 112. FIG. 2 shows the pass frequency characteristics of the first high
pass filter 111 and the second high pass filter 112 and the low pass filter 114 in the acoustic
signal amplifier according to the first embodiment of the present invention. Is a diagram showing
an example of the relationship between the frequency characteristics of
In FIG. 2, the frequency at which the pass frequency characteristic 201 of the low pass filter and
the pass frequency characteristic 202 of the high pass filter intersect is referred to as a crossover
point 203. The pass frequency characteristic of the low pass filter 114 is set to have a crossover
point 203 when crossing the pass frequency characteristics of the first high pass filter 111 and
the second high pass filter 112. The low pass acoustic signal output by the low pass filter 114 is
input to the third polarity reversing means 115, and the third polarity reversing means 115
reverses the polarity of the input low pass acoustic signal. It generates an anti-phase low-pass
acoustic signal and outputs the generated anti-phase low-pass acoustic signal to the selection
means 120. Input to the first input terminal 101 and the second input terminal 102 by the first
high pass filter 111, the second high pass filter 112, the monaural addition means 113 and the
low pass filter 114 described above The divided stereo audio signal is divided into bands, and the
signal that has passed through the first high pass filter 111 and the second high pass filter 112
is outputted to a speaker for all bands and is amplified, and monaural addition means 113 The
signal that has been added and passed through the low pass filter 114 is called a low range
loudspeaker (hereinafter referred to as a subwoofer). Function to output a signal (hereinafter
referred to as "band-division and amplification"). Can be realized. The subwoofer receives not
only the signal that has passed through the low pass filter 114, but also the signal whose polarity
is inverted by the third polarity reversing means 115 for the signal that has passed through the
low pass filter 114, and the subwoofer Is driven by the two signals mentioned above. Here, it is a
well-known technique that a subwoofer having a capacity twice as large as that of a full band
speaker is driven by a positive phase signal and a negative phase signal, and in general, BTL
(Balanced Trans Less) driving It is said. The selection means 120 causes the output driver to
amplify the high band acoustic signal and the low band acoustic signal or causes the output
driver to output the acoustic signal inputted from the outside, by making the user select whether
or not to execute band division amplification. It allows the driver to select whether to amplify. In
the selection means 120, the first acoustic signal outputted by the first input terminal 101, the
first high-pass acoustic signal outputted by the first high-pass filter 111, the first signal selection
The first selection signal output by the means 106, the second high frequency acoustic signal
output by the second high pass filter 112, the third acoustic signal output by the third input
terminal 103, low frequency The low-pass acoustic signal output by the pass filter 114, the
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second selection signal output by the second signal selection unit 108, and the anti-phase lowpass acoustic signal output by the third polarity inverting unit 115 are input. It is supposed to be.
When it is selected by the user to execute band-division amplification, the selection means 120
outputs the first high-frequency acoustic signal to the first output driver 131 and the second
high-frequency acoustic signal as the second high-frequency acoustic signal. The low frequency
acoustic signal is outputted to the third output driver 133, and the antiphase low frequency
acoustic signal is outputted to the fourth output driver 134. Further, when the user selects not to
execute band division amplification, the selection means 120 outputs the first acoustic signal to
the first output driver 131, and the first selection signal is transmitted to the second output
driver 131. The third acoustic signal is output to the third output driver 133, and the second
selection signal is output to the fourth output driver 134. Here, for example, the selection unit
120 includes a terminal connected to the first input terminal 101, a terminal connected to the
first high pass filter 111, and a terminal connected to the first output driver 131. , A terminal
connected to the first signal selection means 106, a terminal connected to the second high pass
filter 112, and a terminal connected to the second output driver 132. Fifth signal selecting means
having a fourth signal selecting means 122, a terminal connected to the third input terminal 103,
a terminal connected to the low pass filter 114, and a terminal connected to the third output
driver 133 123, and a terminal connected to the second signal selection unit 108, a terminal
connected to the third polarity inversion unit 115, and a terminal connected to the fourth output
driver 134. You may be comprised by the 6th signal selection means 124 which has. In the
configuration example of the selection means 120 described above, the terminal connected to the
first high-pass filter 111 and the first output driver 131 are connected when it is selected by the
user to execute band division amplification. And the terminal connected to the second high pass
filter 112 and the terminal connected to the second output driver 132 are connected, and the
terminal connected to the low pass filter 114 and the third The terminal connected to the output
driver 133 is connected, and the terminal connected to the third polarity inverting means 115
and the terminal connected to the fourth output driver 134 are connected. Further, in the
configuration example of the selection means 120 described above, the terminal connected to the
first input terminal 101 and the first output driver 131 are connected when it is selected by the
user not to execute band division amplification. And the terminal connected to the first signal
selection means 106 and the terminal connected to the second output driver 132 are connected,
and the terminal connected to the third input terminal 103 and the A terminal connected to the
third output driver 133 is connected, and a terminal connected to the second signal selection
means 108 and a terminal connected to the fourth output driver 134 are connected.
The first output driver 131 is configured to receive the first acoustic signal or the first highfrequency acoustic signal output from the selection unit 120, and the first output driver 131 is
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configured to The amplitude of the input signal is amplified, and the amplified signal is output to
an external speaker connected to the first output terminal 141 to drive the external speaker. The
second output driver 132 receives the first selection signal or the second high frequency acoustic
signal output from the selection unit 120, and the second output driver 132 outputs the
amplitude of the input signal. , And outputs the amplified signal to an external speaker connected
to the second output terminal 142 to drive the external speaker. The third output driver 133
receives the third acoustic signal or the low-range acoustic signal output from the selection unit
120, and the third output driver 133 amplifies the amplitude of the input signal. The amplified
signal is output to an external speaker connected to the third output terminal 143 to drive the
external speaker. The fourth output driver 134 receives the second selection signal or the
antiphase low-pass audio signal output by the selection unit 120, and the fourth output driver
134 outputs the amplitude of the input signal. The amplified and amplified signal is output to an
external speaker connected to the fourth output terminal 144 to drive the external speaker. The
first output terminal 141 is a terminal to which an external speaker is connected and which
outputs a signal output by the first output driver 131 to the external speaker. The second output
terminal 142 is a terminal to which an external speaker is connected and which outputs the
signal output by the second output driver 132 to the external speaker. The third output terminal
143 is a terminal to which an external speaker is connected and which outputs the signal output
by the third output driver 133 to the external speaker. The fourth output terminal 144 is a
terminal to which an external speaker is connected and which outputs the signal output by the
fourth output driver 134 to the external speaker. Here, in the case of causing the acoustic signal
amplifying device 100 to execute band division amplification, the first full band speaker 401 is
connected to the first output terminal 141, and the second output terminal 142 is connected to
the second output terminal 142. The low band speaker 403 is connected to the third output
terminal 143 and the second output terminal 142 of the full band speaker 402.
Further, when the sound signal amplifying apparatus 100 is not to perform band division
amplification, it is connected to the first output terminal 141, the second output terminal 142,
the third output terminal 143, and the fourth output terminal 144. It is assumed that the type of
speaker to be selected changes according to the acoustic signal input to the first input terminal
101, the second input terminal 102, the third input terminal 103, and the fourth input terminal
104. Hereinafter, the operation of the acoustic signal amplifier according to the first embodiment
of the present invention will be described in the case where it is selected that the band division
loudspeaker should be performed by the selection means 120. Note that, prior to the following
description, the first acoustic signal is input to the first input terminal 101, the second acoustic
signal is input to the second input terminal 102, and the first output terminal 141 is A first full
band speaker 401 is connected, a second full band speaker 402 is connected to the second
output terminal 142, and a low band is connected to the third output terminal 143 and the
fourth output terminal 144. It is assumed that the speaker 403 is connected. First, the first
acoustic signal is input to the first high pass filter 111, and the first high pass filter 111 receives
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only signal components of frequency bands higher than a predetermined frequency of the first
acoustic signal. After the passed first high-frequency acoustic signal is amplified by the first
output driver 131, the signal is amplified by the first full-band speaker 401. Further, the second
acoustic signal is input to the second high pass filter 112, and the second high pass filter 112
only receives signal components in a frequency band higher than a predetermined frequency of
the second acoustic signal. After passing through the second high-frequency sound signal is
amplified by the second output driver 132, the signal is amplified by the second full-band
speaker 402. Further, the first acoustic signal and the second acoustic signal are input to the
monaural addition means 113, and the addition acoustic signal based on the first acoustic signal
and the second acoustic signal is generated by the monaural addition means 113. The low pass
acoustic signal is input to the low pass filter 114, and the low pass filter 114 passes only signal
components of frequency bands lower than a predetermined frequency of the add acoustic signal
as a third output driver. After being amplified by 133, the signal is amplified by the low band
speaker 403. Also, the low-pass acoustic signal is input to the third polarity inverting means 115,
and the reverse-phase low-pass acoustic signal based on the low-pass acoustic signal is generated
by the third polarity inverting means 115. The low phase audio signal is input to the fourth
output driver 134 and amplified, and then amplified by the low band speaker 403.
The operation of the acoustic signal amplifier according to the first embodiment of the present
invention will be described below in the case where the selection means 120 is selected not to
execute band-division amplification. Note that, prior to the following description, the first
acoustic signal is input to the first input terminal 101, the second acoustic signal is input to the
second input terminal 102, and the third input terminal 103 is input. The third acoustic signal is
input, the fourth acoustic signal is input to the fourth input terminal 104, and the first output
terminal 141, the second output terminal 142, the third output terminal 143, and the fourth It is
assumed that the speaker for the entire band is connected to the output terminal 144. The first
acoustic signal input through the first input terminal 101 is input to the first output driver 131
and amplified, and then amplified by the full band speaker, and the second input terminal 102 is
amplified. A second acoustic signal input through the second output driver 132 is amplified and
then amplified by a full band speaker, and then input through the third input terminal 103. The
acoustic signal is input to the third output driver 133 and amplified, and then amplified by the
full band speaker, and the fourth acoustic signal input through the fourth input terminal 104 is
the fourth output driver 134. The signal is amplified and then amplified by the full band speaker.
As described above, since the acoustic signal amplifier according to the first embodiment of the
present invention has the band division and amplification function inside, when the acoustic
signal is divided into bands and amplified, It is possible to eliminate complicated connections and
settings between devices, and it is possible to prevent an accident in which a speaker is broken
due to an error in connections and settings between devices. In addition, since it can be
collectively set whether or not to execute band division amplification, the present invention is
applicable to an acoustic signal amplification system that does not use the internal band division
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amplification function. Further, since the polarity of the input acoustic signal can be reversed, it
is possible to BTL drive the low frequency speaker by inputting the acoustic signal which has
been band-divided by the external device. In the acoustic signal amplifier according to the first
embodiment of the present invention, the first polarity inverting means 105, the first signal
selecting means 106, the second polarity inverting means 107, and the second signal are used. It
is possible to do without having the selection means 108. At this time, the second input terminal
102 outputs the second acoustic signal input from the external device to the monaural addition
unit 113 and the fourth signal selection unit 122, and the fourth input terminal 104 is input
from the external device The fourth acoustic signal is output to the sixth signal selection means
124.
Further, in the acoustic signal amplifier according to the first embodiment of the present
invention, the number of input terminals, output drivers and output terminals is four, but four or
more input terminals, output drivers And an output terminal. As described above, the present
invention can provide an acoustic signal amplifier capable of dividing an acoustic signal into
bands without complicated connection and setting between the apparatuses. It is. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram showing an acoustic
signal amplifier according to a first embodiment of the present invention. FIG. 2 is an acoustic
signal amplifier according to a first embodiment of the present invention. Fig. 3 shows an
example of the relationship between the high pass frequency characteristic and the low pass
frequency characteristic of the device. Fig. 3 shows a schematic block configuration of a
conventional acoustic signal amplifier. Device 101, 301 first input terminal 102, 302 second
input terminal 103, 303 third input terminal 104, 304 fourth input terminal 105, 305 first
polarity inverting means 106, 306 first signal selection Means 107, 307 Second polarity
inverting means 108, 308 Second signal selecting means 111, 311 First high pass filter 112, 312
Second high pass filter 113, 313 Monaural addition Means 114 314 Low-pass filter 115 Third
polarity inverting means 120 Selection means 121 Third signal selection means 122 Fourth
signal selection means 123 Fifth signal selection means 124 Sixth signal selection means 131,
331 1 output driver 132, 332 second output driver 133, 333 third output driver 134, 334
fourth output driver 141, 341 first output terminal 142, 342 second output terminal 143, 343
third Output terminal 144, 344 Fourth output terminal 201 Passing frequency characteristic of
low pass filter 202 Passing frequency characteristic of high pass filter 203 Crossover point 350
Band divider 351 Fifth input terminal 352 Sixth input terminal 353 5 output terminal 354 sixth
output terminal 355 seventh output terminal 401 First full band speaker 402 Second full band
speaker 403 Low band speaker
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