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DESCRIPTION JPWO2014083981

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DESCRIPTION JPWO2014083981
Abstract Construct a digital speaker system that effectively uses the features of the signal
processing circuit. The digital speaker system 1 including a plurality of speakers includes a signal
processing circuit 10 that outputs a plurality of digital signals for right audio and a plurality of
digital signals for left audio, and at least one speaker among the plurality of speakers is One or
more arbitrary right audio digital signals output by the signal processing circuit 10 and an
arbitrary number of left audio digital signals corresponding to the number of the signals are
input to output monaural audio It functions as a speaker 2.
Digital speaker system and wiring method of digital speaker system
[0001]
The present invention relates to a digital speaker system including a digital speaker to which a
digital signal is input, and a connection method of the digital speaker system.
[0002]
Conventionally, a digital speaker driven based on a digital signal input from a signal processing
circuit (drive circuit) has been proposed (see, for example, Patent Document 1).
[0003]
Unexamined-Japanese-Patent No. 2010-28785
[0004]
11-04-2019
1
Here, in the signal processing circuit used for the above-described digital speaker, the digital
audio signal for the right audio and the left audio are processed by performing predetermined
digital processing on the digital audio signal input from the sound source such as an audio
device. The digital signal is characterized in that it can generate and output signals of multiple
channels (for example, three channels each).
There is a need to construct a digital speaker system by effectively utilizing such features of the
signal processing circuit.
The present invention has been made in view of the above-described circumstances, and an
object of the present invention is to construct a digital speaker system that effectively utilizes the
features of a signal processing circuit, and to provide a connection method of the digital speaker
system. .
[0005]
In order to achieve the above object, the present invention provides a speaker system comprising
a plurality of speakers, comprising a plurality of signal processing circuits for outputting a
plurality of digital signals for right audio and a plurality of digital signals for left audio, Among
the speakers, at least one of the speakers, one or more arbitrary right audio digital signals output
by the signal processing circuit, and an arbitrary number of left audio digital signals
corresponding to the number of the signals. It is characterized in that it is made to function as a
monaural audio speaker for inputting and outputting monaural audio.
[0006]
Further, according to the present invention, one or more right audio digital signals not input to
the monaural speaker are input to output a right audio, and the right audio speaker is not input
to the monaural speaker. And a left audio speaker for outputting left audio upon receiving one or
more left audio digital signals.
[0007]
Further, the present invention is characterized in that each of the speakers is configured of the
same type, while the number of digital signals input to each of the speakers is the same.
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[0008]
Further, according to the present invention, there is provided a wiring method of a speaker
system comprising: a plurality of speakers; a plurality of digital signals for right audio; and a
signal processing circuit for outputting a plurality of digital signals for left audio; Among them,
one or more arbitrary right audio digital signals output by the signal processing circuit and an
arbitrary number of left audio digital signals corresponding to the number of the signals are
input to at least one of the speakers. , And output monaural sound.
[0009]
Furthermore, the present invention is not limited to the above-described speaker that outputs
one or more right audio digital signals to the speakers other than the speaker that outputs
monaural sound, outputs right audio, and outputs monaural sound, and One or more left audio
digital signals are input to the speakers other than the speaker that outputs right audio, and left
audio is output.
[0010]
According to the present invention, the features of the signal processing circuit can be effectively
used to construct a digital speaker system, and a connection method of the digital speaker
system can be provided.
[0011]
It is a figure showing composition of digital speaker 11 concerning this embodiment.
It is a figure used for description of the conventional analog speaker system.
FIG. 1 is a diagram showing the configuration of a digital speaker system 1;
(A) shows the digital speaker system based on Example 1, (B) is a figure which shows the digital
speaker system based on Example 2. FIG.
(A) shows the digital speaker system based on Example 3, (B) is a figure which shows the digital
speaker system based on Example 4. FIG.
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(A) shows a digital speaker system according to example 5, and (B) shows a digital speaker
system according to example 6.
[0012]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a view schematically showing the configuration of the digital speaker 11 in a mode
suitable for the description in order to explain the function of the signal processing circuit 10
according to the present embodiment.
The digital speaker 11 is connected to a stationary, portable, or in-vehicle music player, a mobile
phone, a tablet terminal, or other sound source by wire or wireless, and based on a digital audio
signal input from the sound source. It is a speaker that outputs sound. As shown in FIG. 1, the
digital speaker 11 includes a signal processing circuit 10 and a speaker body 12. The signal
processing circuit 10 is provided with a connector (not shown), to which a cable for inputting a
digital audio signal from a sound source is connected. The signal processing circuit 10 performs
predetermined signal processing on the input digital audio signal to generate and output three
channels of right audio digital signals and three channels of left audio digital signals. . More
specifically, the signal processing circuit 10 is mounted with digital circuits such as a ΔΣ
modulation circuit and a predetermined filter circuit, and the signal processing circuit 10
performs predetermined operations on input digital audio signals by the functions of these
circuits. Signal processing such as sampling processing and filtering processing to generate
digital signals for the left and right channels. Then, the signal processing circuit 10 amplifies the
generated digital signals for the left and right six channels by six digital amplifiers (not shown)
provided for each channel, and generates six signal lines 15 provided for each channel. Output
through. Although each of the signal lines 15 physically has two signal transmission lines (for
example, tinsel lines) corresponding to plus and minus, the illustration in FIG. 1 is omitted in
consideration of the convenience of the description. At the same time, the detailed description
will be omitted in the following description.
[0013]
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4
The speaker body 12 includes a bobbin 20 and a diaphragm 21 supported by the bobbin 20.
Although not shown, the bobbin 20 is provided with six layers of voice coils, and the voice coil of
each layer is provided. Each of the signal lines 15 of each channel is electrically connected. The
voice coil is, for example, provided so as to be stacked in multiple layers in the circumferential
direction of the bobbin 20, and, for example, provided in the axial direction of the bobbin 20 at
intervals for each layer. When audio is output by the digital speaker 11, digital audio signals
from a sound source are input to the signal processing circuit 10, and further, six left and right
channels are generated from the signal processing circuit 10 via the signal lines 15 of each
channel. Each of the digital signals is input to the voice coil of each layer as a drive signal. Then,
with the input of the digital signal as the drive signal, the voice coil located in the magnetic gap is
driven, and with the driving of the voice coil, the diaphragm 21 vibrates, and the sound is output
according to the vibration. .
[0014]
As described above, the signal processing circuit 10 according to the present embodiment
performs the predetermined digital processing on the digital audio signal input from the sound
source, whereby the right audio digital signal for three channels and the left for three channels
are obtained. It is characterized in that it can generate and output an audio digital signal. Then,
as described later, in the present embodiment, by utilizing this feature, the monaural audio
speaker 2 for outputting monaural audio, the right audio speaker 3 for outputting right audio in
stereo, and the left audio are output. The digital speaker system 1 configured to include the left
audio speaker 4 (all described later) is appropriately constructed. Hereinafter, first, a
conventional analog speaker system will be described, and after the problem is clarified, the
digital speaker system 1 according to the present embodiment will be described.
[0015]
FIG. 2 is a diagram used to explain a conventional analog speaker system, wherein (A) is a
general stereo reproduction analog comprising a right speaker Q3 for the right channel and a left
speaker Q4 for the left channel FIG. 2B shows a first analog speaker system Q1 which is a
speaker system, and FIG. 2B shows a second analog speaker system Q2 constructed by adding a
center speaker Q5 to the first analog speaker system Q1 shown in FIG. ing. As shown in FIG. 2A,
the first analog speaker system Q1 includes an analog amplifier Q6, and an analog audio signal
of the right channel is amplified by the amplifier and output to the right speaker Q3 to be output
from the speaker for the right In the same manner, the analog audio signal of the left channel is
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5
amplified by the amplifier and output to the left speaker Q4, and the audio for the left is output
from the speaker, whereby stereo reproduction is realized.
[0016]
As shown in FIG. 2B, it is assumed that a center speaker Q5 is added to such a first analog
speaker system Q1 to construct a speaker system including center and left and right speakers. In
this case, as shown in FIG. 2B, the signal line connecting the analog amplifier Q6 and the right
speaker Q3 is branched and connected to the terminal 1 of the center speaker Q5, and the analog
amplifier Q6 and the left speaker Q4 are connected. It is conceivable that the signal line to be
connected is branched and connected to the other terminal of the center speaker Q5. Thus,
although it is possible to construct a speaker system provided with a center and left and right
speakers, in such a case, there are the following problems. That is, in the case of the above
configuration, since the analog sound signal of the right channel and the analog sound signal of
the left channel are directly synthesized in the center speaker Q5, distortion of the signal may be
amplified. In addition, since there is no dedicated amplifier for the center speaker Q5, it is
impossible to independently adjust the sound pressure of the center speaker Q5. In order to solve
this problem, when an amplifier dedicated to the center speaker Q5 is provided, an analog audio
signal of the center channel is generated by the preamplifier, and then an analog audio signal of
the center channel is transmitted to the center speaker Q5 via the dedicated amplifier. The circuit
size becomes large.
[0017]
In the present embodiment, the characteristics of the signal processing circuit 10 are effectively
used to solve the conventional problems as described above, and then a speaker system including
a center and left and right speakers is constructed to improve localization. And, I am trying to
improve the resolution of the voice.
[0018]
FIG. 3 is a view schematically showing a configuration of the digital speaker system 1 according
to the present embodiment.
As shown in FIG. 3, the digital speaker system 1 is a speaker system provided with a center and
left and right speakers, and is a monaural sound speaker 2 (speaker corresponding to the center
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6
speaker Q5), a right sound speaker 3 (right speaker A speaker corresponding to Q3) and a
speaker 4 for the left audio (a speaker corresponding to the left speaker Q4) are configured. As
shown in FIG. 3, the monaural audio speaker 2 receives any one right audio digital signal among
the right audio digital signals for three channels, and also receives three channels of left audio
digital signals. Of these, one left audio digital signal is input. As described above, in the digital
speaker system 1 according to the present embodiment, the signal processing circuit 10
generates the multi-channel (multiple) right audio digital signal and the multi-channel (multiple)
left audio digital signal, and outputs them. Focusing on one or more (in this example, one)
arbitrary right audio digital signals, and a number (in this example, one) of arbitrary left audios
corresponding to the number of the signals. Digital signal is input to the monaural sound speaker
2, thereby realizing monaural sound output by the monaural sound speaker 2. With such a
configuration, the following effects can be achieved. That is, the left and right digital audio
signals input to the monaural audio speaker 2 are respectively input to and synthesized by any of
the multi-layered voice coils provided on the bobbin 20 as described with reference to FIG.
Digital audio signal generated assuming that. For this reason, with respect to each of the left and
right digital audio signals, the characteristic variation is small and distortion when combining the
respective signals is small. In particular, the amount of distortion is remarkable as compared with
the case where the analog audio signal of the right channel and the analog audio signal of the left
channel are synthesized. Furthermore, as described above, the signal processing circuit 10 is
provided with a digital amplifier for each channel (= for each digital audio signal to be output).
Therefore, in the digital speaker system 1, the sound pressure of the monaural sound speaker 2
can be independently level-adjusted without providing a dedicated preamplifier and an amplifier
as in the conventional second analog speaker system Q2. That is, in the digital speaker system 1,
it is possible to adjust the sound pressure of the monaural sound speaker 2 without increasing
the circuit size by utilizing the digital amplifier already installed in the signal processing circuit
10.
[0019]
Further, as shown in FIG. 3, two right audio digital signals not input to the monaural audio
speaker 2 are input to the right audio speaker 3. Under such a configuration, only the right audio
digital signal is input to the right audio speaker 3, and the right audio is appropriately output.
That is, in the digital speaker system 1 according to the present embodiment, the signal
processing circuit 10 generates and outputs multi-channel (multiple) right audio digital signals
and multi-channel (multiple) left audio digital signals. By focusing on the right audio digital signal
not input to the monaural audio speaker 2 to the right audio speaker 3, the output of the right
audio by the right audio speaker 3 is realized. Similarly, two left audio digital signals not input to
the monaural audio speaker 2 are input to the left audio speaker 4. The effect based on the said
structure is the same as the effect in the speaker 3 for right audio | voices.
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[0020]
Further, as shown in FIG. 3, in the digital speaker system 1 according to the present embodiment,
the three speakers (the speaker 2 for monaural sound, the speaker 3 for right sound, and the
speaker 4 for left sound) constituting the system Each channel is configured to receive digital
audio signals for two channels. According to this configuration, the following effects can be
obtained. That is, by making the number of channels of the input digital audio signal the same for
each of the speakers constituting the digital speaker system 1, the number of input terminals can
be made the same for each of the speakers. Can be of the same type. Therefore, when
constructing the digital speaker system 1, it is sufficient to prepare the same number of speakers
of the same type, without preparing as many other types of speakers as it is appropriate, to
improve construction easiness, parts It is possible to realize the reduction of types and the
reduction of manufacturing costs. In particular, in the present embodiment, each of the three
speakers constituting the digital speaker system 1 is configured to receive digital audio signals
for two channels. For this reason, an analog speaker having two popular input terminals can be
applied as the three speakers constituting the digital speaker system 1, thereby further
improving the ease of construction, reducing the kind of parts, and , Can reduce the
manufacturing cost.
[0021]
As described above, in the present embodiment, the digital speaker system 1 outputs the
plurality of right audio digital signals and the plurality of left audio digital signals by the signal
processing circuit 10 and the signal processing circuit 10. And one or more arbitrary right audio
digital signals and a monaural audio speaker 2 for outputting arbitrary monaural audio when any
left audio digital signals corresponding in number to the number of said signals are input. There
is. That is, the signal processing circuit 10, the monaural sound speaker 2, the right sound
speaker 3, and the left sound speaker 4 are connected by an appropriate method so as to have
such a configuration. According to this configuration, the digital audio signal input from the
sound source is subjected to predetermined digital processing to generate and output three
channels of right audio digital signals and three channels of left audio digital signals. It is
possible to realize the construction of a speaker system having a monaural speaker capable of
independently adjusting the sound pressure level without enlarging the circuit board by utilizing
the feature of the signal processing circuit 10 that is possible It is.
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[0022]
Further, in the digital speaker system 1 according to the present embodiment, the right audio
speaker 3 for outputting right audio when one or more right audio digital signals not input to the
monaural audio speaker 2 are input, and monaural audio And a left audio speaker 4 for
outputting left audio when one or more left audio digital signals not input to the speaker are
input. According to this configuration, in addition to the monaural sound speaker 2, the right
speaker that appropriately outputs the right sound and the left sound that appropriately output
the left sound using the characteristics of the signal processing circuit 10 It is possible to realize
the construction of a speaker system having speakers of
[0023]
Furthermore, in the present embodiment, the number of digital audio signals input to each of the
speakers constituting the digital speaker system 1 is the same, and each of the speakers is
configured of the same type. According to this configuration, when the digital speaker system 1
is constructed, it is sufficient to prepare the same number of speakers of the same type, without
preparing as many other types of speakers as appropriate. It is possible to realize improvement,
reduction of parts types and reduction of manufacturing costs.
[0024]
<Other Examples> By applying the present invention, it is possible to construct a wide variety of
speaker systems with improved localization and improved resolution. Hereinafter, a speaker
system to which the present invention is applied will be described by taking a specific example.
[0025]
Example 1 FIG. 4A is a diagram showing the configuration of the digital speaker system 1a of
Example 1. As shown in FIG. The signal processing circuit 10a according to this example 1
generates and outputs three channels of right audio digital signals and three channels of left
audio digital signals, as in the above-described embodiment. The digital speaker system 1a is
provided with three monaural audio speakers 21a to 23a, and each of the three speakers has one
channel of right audio digital signal and one channel of left audio digital signal Is input. Under
11-04-2019
9
such a configuration, each of the three speakers constituting the digital speaker system 1a
functions as a speaker for monaural sound driven based on the right sound digital signal and the
left sound digital signal. According to the configuration of the digital speaker system 1a of this
example 1, the feature of the signal processing circuit 10a capable of outputting three channels
of right audio digital signals and three channels of left audio digital signals is used. It is possible
to realize the construction of a speaker system having three monaural sound speakers whose
sound pressure levels can be independently adjusted without increasing the size of the circuit
board.
[0026]
Example 2 FIG. 4B is a view showing the configuration of a digital speaker system 1b of Example
2. As shown in FIG. The signal processing circuit 10b according to the second example generates
and outputs four channels of right audio digital signals and four channels of left audio digital
signals, unlike the above-described embodiment. The digital speaker system 1b includes four
monaural audio speakers 21b to 24b, and the four speakers each include one channel of right
audio digital signals and one channel of left audio digital signals. Is input. Under such a
configuration, each of the four speakers constituting the digital speaker system 1b functions as a
speaker for monaural sound driven based on the right sound digital signal and the left sound
digital signal. According to the configuration of the digital speaker system 1b of Example 2, the
feature of the signal processing circuit 10b capable of outputting four channels of right audio
digital signals and four channels of left audio digital signals can be used. It is possible to realize
the construction of a speaker system having four monaural sound speakers whose sound
pressure levels can be independently adjusted without increasing the size of the circuit board.
[0027]
Example 3 FIG. 5A is a diagram showing the configuration of a digital speaker system 1c of
Example 3. As shown in FIG. The signal processing circuit 10c according to the third example
generates and outputs four channels of right audio digital signals and four channels of left audio
digital signals, unlike the above-described embodiment. The digital speaker system 1c is provided
with a monaural audio speaker 2c, a right audio speaker 3c, and a left audio speaker 4c. One
channel of right audio digital signal and one channel of left audio digital signal are input to the
monaural audio speaker 2c, and three channels of right audio digital signal are input to the right
audio speaker 3c. Is input, and a left audio digital signal for three channels is input to the left
audio speaker 4c. Under such a configuration, the monaural audio speaker 2c constituting the
digital speaker system 1c functions as a monaural audio speaker driven based on the right audio
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digital signal and the left audio digital signal. The speaker 3c functions as a speaker for the right
audio driven based only on the digital signal for the right audio, and the speaker 4c for left audio
functions as a speaker for the left audio driven based only on the digital signal for the left audio
Do. According to the configuration of the digital speaker system 1c of Example 3, the feature of
the signal processing circuit 10c that can output the right audio digital signal for four channels
and the left audio digital signal for four channels can be utilized. To realize the construction of a
speaker system having a speaker for monaural sound, a speaker for right sound, and a speaker
for left sound which can independently adjust the sound pressure level without enlarging the
circuit board. It is possible.
[0028]
Example 4 FIG. 5B is a view showing the configuration of a digital speaker system 1 d of Example
4. As shown in FIG. The signal processing circuit 10d according to the fourth example generates
and outputs four channels of right audio digital signals and four channels of left audio digital
signals, unlike the above-described embodiment. The digital speaker system 1d includes two
monaural sound speakers 21d and 22d, a right sound speaker 3d, and a left sound speaker 4d.
One channel of right audio digital signal and one channel of left audio digital signal are input to
each of the two monaural audio speakers 21d and 22d, and two channels of the right audio
speaker 3d are input. The right audio digital signal is input, and the left audio digital signal for
two channels is input to the left audio speaker 4d. Under such a configuration, each of the two
monaural sound speakers 21d and 22d constituting the digital speaker system 1d is a monaural
sound speaker driven based on the right sound digital signal and the left sound digital signal. The
right audio speaker 3d functions as a right audio speaker driven based only on the right audio
digital signal, and the left audio speaker 4d drives based on only the left audio digital signal. It
functions as a speaker for voice. According to the configuration of the digital speaker system 1d
of Example 4, the feature of the signal processing circuit 10d that can output the right audio
digital signal for four channels and the left audio digital signal for four channels can be utilized.
Realize a speaker system having two monaural sound speakers, a right sound speaker, and a left
sound speaker, which can independently adjust the sound pressure level without increasing the
circuit board size. It is possible.
[0029]
Example 5 FIG. 6A is a view showing the configuration of a digital speaker system 1e of Example
5. As shown in FIG. The digital speaker system 1e according to the fifth example includes two
signal processing circuits 10er and el, and the two signal processing circuits 10er and el
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11
cooperate with one another to “a plurality of digital signals for right audio, and It functions as a
signal processing circuit that outputs a plurality of left audio digital signals. The signal
processing circuit 10er generates and outputs eight channels of right audio digital signals, and
the signal processing circuit 10el generates and outputs eight channels of left audio digital
signals. The digital speaker system 1e includes four monaural sound speakers 21e to 24e, two
right sound speakers 31e and 32e, and two left sound speakers 41e and 42e. A right audio
digital signal for one channel and a left audio digital signal for one channel are input to each of
the four monaural audio speakers 21e to 24e. That is, any one right audio digital signal of the
signal processing circuit 10er is input to each of the four monaural audio speakers 21e to 24e,
and one arbitrary left audio digital of the signal processing circuit 10el. Each signal is input. The
right audio digital signals for any two channels output from the signal processing circuit 10er are
input to the two right audio speakers 31e and 32e, respectively. Further, to each of the two left
audio speakers 41e and 42e, left audio digital signals for any two channels output from the
signal processing circuit 10el are input. Under such a configuration, each of the four monaural
sound speakers 21e to 24e constituting the digital speaker system 1e is a monaural sound
speaker driven based on the right sound digital signal and the left sound digital signal. Each of
the two right audio speakers 31e and 32e functions as a right audio speaker driven based only
on the right audio digital signal, and each of the two left audio speakers 41e and 42e is It
functions as a speaker for left audio driven based on only the left audio digital signal. According
to the configuration of the digital speaker system 1e of the fifth example, a signal processing
circuit 10er that outputs eight channels of right audio digital signals and a signal processing
circuit 10el that outputs eight channels of left audio digital signals are provided. 4 monaural
audio speakers, 2 right audio speakers, and 2 left audio speakers that can independently adjust
the sound pressure level without increasing the size of the circuit board by taking advantage of
the features provided. It is possible to realize the construction of a loudspeaker system having
loudspeakers.
[0030]
Example 6 FIG. 6B is a diagram showing the configuration of a digital speaker system 1 f of
Example 6. The digital speaker system 1f according to the sixth example includes two signal
processing circuits 10fr and 10fl, and the two signal processing circuits 10fr and 10fl cooperate
with one another to “a plurality of digital signals for right audio, and It functions as a signal
processing circuit that outputs a plurality of left audio digital signals. The signal processing
circuit 10fr generates and outputs right audio digital signals for six channels, and the signal
processing circuit 10fl generates and outputs left audio digital signals for six channels. The
digital speaker system 1 f includes two monaural sound speakers 21 f and 22 f, two right sound
speakers 31 f and 32 f, and two left sound speakers 41 f and 42 f. A right audio digital signal for
one channel and a left audio digital signal for one channel are input to each of the two monaural
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audio speakers 21 f and 22 f. That is, an arbitrary one right audio digital signal of the signal
processing circuit 10 fr is input to each of the two monaural audio speakers 21 f and 22 f, and an
arbitrary one left audio digital of the signal processing circuit 10 fl Each signal is input. The right
audio digital signal for any two channels output from the signal processing circuit 10fr is input
to each of the two right audio speakers 31f and 32f. Further, to each of the two left audio
speakers 41f and 42f, an arbitrary two channels of left audio digital signals output from the
signal processing circuit 10fl are input. Under such a configuration, each of the two monaural
sound speakers 21f and 22f constituting the digital speaker system 1f is a monaural sound
speaker driven based on the right sound digital signal and the left sound digital signal. Each of
the two right audio speakers 31f and 32f functions as a right audio speaker driven based only on
the right audio digital signal, and each of the two left audio speakers 41f and 42f is It functions
as a speaker for left audio driven based on only the left audio digital signal. According to the
configuration of the digital speaker system 1f of the sixth example, a signal processing circuit
10fr outputting the right audio digital signal for six channels and a signal processing circuit 10fl
outputting the left audio digital signal for six channels Two monaural audio speakers, two right
audio speakers, and two left audio speakers that can be independently adjusted in sound
pressure level without increasing the size of the circuit board by using the features provided. It is
possible to realize the construction of a loudspeaker system having loudspeakers.
[0031]
The embodiment described above merely shows one aspect of the present invention, and any
modification and application can be made within the scope of the present invention. For example,
in the above, the configuration of the speaker system has been specifically described by taking a
plurality of examples, but it goes without saying that the configuration of the speaker system to
which the present invention is applied is not limited to those described by the examples. Yes.
That is, the present invention is widely applicable to a speaker system provided with a circuit
having the same function as the signal processing circuit 10. In the above-described embodiment,
the signal processing circuit 10 uses six and eight channels, but the number of channels of the
signal processing circuit 10 may be any number within the scope of the present invention.
[0032]
1, 1a, 1b, 1c, 1d, 1e, 1f Digital Speaker System 2, 21a-23a, 21b-24b, 2c, 21d, 22d, 21e-24e, 21f,
22f Monaural Speakers 3, 3c, 3d, 31e , 32e, 31f, 32f right audio speakers 4, 4c, 4d, 41e, 42e,
41f, 42f left audio speakers 10, 10a, 10b, 10c, 10d, 10er, 10el, 10fr, 10fl signal processing
circuits
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