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JP2005065111

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DESCRIPTION JP2005065111
PROBLEM TO BE SOLVED: To simplify cable connection work involved in switching the
arrangement of both speaker units in a speaker system including an active speaker unit and a
passive speaker unit. SOLUTION: A speaker system according to the present invention comprises
a center unit 1 for outputting acoustic signals of two channels, an active speaker unit 2
connected to the center unit 1 via a system cable 5, an active speaker unit 2 and a speaker It
comprises a passive speaker unit 3 connected via a cable 4. The active speaker unit 2 includes
the speaker 21 and a selector 7 for exchanging the two channels of audio signals to be supplied
to the two output terminal units 6 and 60. The control circuit 11 of the center unit 1 has both
output terminal units 6, It is detected which of the terminals 60 the speaker cable 4 is connected
to, and the switching of the selector 7 is controlled. [Selected figure] Figure 1
スピーカシステム
[0001]
The present invention relates to a loudspeaker system comprising an active loudspeaker unit and
a passive loudspeaker unit.
[0002]
A passive speaker unit is configured by attaching a speaker to a cabinet forming an acoustic
space, and an acoustic signal amplified by an external amplifier is supplied to the speaker.
Recently, as a space-saving type speaker unit, a cabinet is used. An active speaker unit
incorporating an amplifier has been developed (see, for example, Patent Document 1).
09-05-2019
1
[0003]
FIG. 5 shows a two-channel (stereo) speaker system using an active speaker unit (90) and a
passive speaker unit (100), and the cabinet (92) of the active speaker unit (90) includes Speaker
(91), a pair of signal input terminals (95) (96) to which a left channel (Lch) acoustic signal and a
right channel (Rch) acoustic signal are to be input, and a pair of amplifiers for amplifying two
channel acoustic signals (93) (94), a power supply circuit (99) for supplying power to the
amplifiers (93) (94), and a left channel sound signal and a right channel sound signal amplified
by the amplifiers (93) (94) A pair of signal output terminals (97) (98) are provided.
[0004]
In the above speaker system (9), the arrangement of the active speaker unit (90) and the passive
speaker unit (100) is determined according to whether the commercial power outlet is deployed
on the left side or the right side of the room. You can do it.
That is, when the outlet of the commercial power supply is disposed on the left side of the room,
the active speaker unit (90) is disposed on the left side as shown in FIG. 5 and the passive
speaker unit (100) is disposed on the right side. Do.
Then, the speaker cable (48) extending from the speaker (91) of the active speaker unit (90) is
connected to the left channel acoustic signal output terminal (97) of the active speaker unit (90)
and the speaker of the passive speaker unit (100) The speaker cable (49) extending from (101) is
connected to the right channel sound signal output terminal (98) of the active speaker unit (90).
Thus, the power cord (103) extending from the power supply circuit (99) of the active speaker
unit (90) can be connected to the power outlet at the shortest distance.
[0005]
On the other hand, when the outlet of the commercial power supply is disposed on the right side
of the room, the active speaker unit (90) is disposed on the right side, and the passive speaker
unit (100) is disposed on the left side. Then, the speaker cable (48) extending from the speaker
(91) of the active speaker unit (90) is connected to the right channel acoustic signal output
terminal (98) of the active speaker unit (90) and the speaker of the passive speaker unit (100)
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The speaker cable (49) extending from (101) is connected to the left channel sound signal output
terminal (97) of the active speaker unit (90). Thus, the power cord (103) extending from the
power supply circuit (99) of the active speaker unit (90) can be connected to the power outlet at
the shortest distance. Unexamined-Japanese-Patent No. 10-313496 [H04R3 / 00]
[0006]
However, in the above speaker system (9), for example, when it becomes necessary to replace the
arrangement of the active speaker unit (90) and the passive speaker unit (100) shown in FIG. 5,
they extend from both speaker units (90) and (100). After pulling out the two speaker cables (48)
and (49) from the signal output terminals (97) and (98) of the active speaker unit (90)
respectively, a speaker cable (long) from the speaker (91) of the active speaker unit (90) 48) is
connected to the right channel sound signal output terminal (98) of the active speaker unit (90),
and the speaker cable (49) extending from the speaker (101) of the passive speaker unit (100)
There is a problem that the operation is complicated because it has to be connected to the left
channel acoustic signal output terminal (97).
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to simplify cable connection
work involved in replacing the arrangement of both speaker units in a speaker system including
an active speaker unit and a passive speaker unit.
[0008]
A first speaker system according to the present invention comprises a center unit (1) for
outputting audio signals of two channels, and an active speaker unit (2) connected to the center
unit (1) via a system cable (5) And an active speaker unit (2) and a passive speaker unit (3)
connected via a speaker cable (4).
The center unit (1) comprises a system cable terminal (16) to which one end of the system cable
(5) is to be connected.
In the active speaker unit (2), a speaker (21), a system cable terminal (8) to which the other end
of the system cable (5) should be connected, and one end of the speaker cable (4) should be
connected An output terminal unit, an audio signal of two channels input to the system cable
terminal unit (8) is amplified and supplied to the speaker (21) and the output terminal unit, and
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3
supplied to the speaker (21) and the output terminal unit And a signal switching circuit for
switching between two channels of audio signals. Then, one terminal unit to which the system
cable (5) or the speaker cable (4) is to be connected is provided at two places, and a cable
selectively to any one terminal unit of these two terminal units A detection circuit is connected to
at least one of the terminal sections to detect which terminal section the cable is connected to,
and a detection signal from the detection circuit is disposed in the center unit (1). The signal is
supplied to the control circuit (11) and the switching operation of the signal switching circuit is
controlled by the control circuit (11).
[0009]
In the speaker system of the present invention, when the active speaker unit (2) is disposed on
the left side and the passive speaker unit (3) is disposed on the right, the user connects the
system cable (5) or the speaker cable (4). A cable is connected to the first terminal (6) of the two
terminal parts to be connected. Conversely, when the active speaker unit (2) is disposed on the
right side and the passive speaker unit (3) is disposed on the left side, the user connects a cable
to the second terminal portion (60). When the cable is connected to the first terminal portion (6),
the connection is detected by the detection circuit, and the control circuit (11) supplies the left
channel sound signal to the speaker (21) of the active speaker unit (2) At the same time, the
signal switching circuit is switched so that the right channel acoustic signal is supplied to the
speaker (31) of the passive speaker unit (3). On the other hand, when the cable is connected to
the second terminal (60), the connection is detected by the detection circuit, and the control
circuit (11) controls the speaker (21) of the active speaker unit (2) to the right channel. The
signal switching circuit is switched so that the left channel sound signal is supplied to the
speaker (31) of the passive speaker unit (3) while the sound signal is supplied.
[0010]
A second speaker system according to the present invention comprises a center unit (110) for
outputting two channels of audio signals, an active speaker unit (25) connected to the center unit
(110) and the system cable (5), and And an active speaker unit (25) and a passive speaker unit
(3) connected via a speaker cable (4). The active speaker unit (25) includes a speaker (21), a
system cable terminal (80) to which one end of a system cable (5) is to be connected, and an
output terminal to which one end of a speaker cable (4) is to be connected (67), an amplification
circuit for amplifying a two-channel acoustic signal input to the system cable terminal (80) and
supplying it to the speaker (21) and the output terminal (67), the speaker (21) and the output
terminal And a signal switching circuit for switching between the two channels of audio signals
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4
to be supplied to the part (67). The center unit (110) generates switching control signals for the
signal switching circuit in accordance with the user's input operation, and supplies switching
control means to the active speaker unit (25) via the system cable (5); Connection detection
means for detecting that one end of the speaker cable (4) is connected to the output terminal
portion (67) of the active speaker unit (25); and a signal switching circuit when connection is
detected by the connection detection means. And switching state locking means for locking to the
switching state at that time.
[0011]
In the speaker system of the present invention, when the active speaker unit (25) is disposed on
the left side and the passive speaker unit (3) is disposed on the right side, the user performs the
arrangement by the input operation to the center unit (110). To direct. Conversely, when the
active speaker unit (2) is arranged on the right side and the passive speaker unit (3) is arranged
on the left side, the user instructs the arrangement by an input operation on the center unit
(110).
[0012]
When an instruction to arrange the active speaker unit (25) on the left side and the passive
speaker unit (3) on the right side is given, the switching control means of the center unit (110) is
of the active speaker unit (25). The signal switching circuit is switched so that the left channel
sound signal is supplied to the speaker (21) and the right channel sound signal is supplied to the
speaker (31) of the passive speaker unit (3). On the other hand, when an instruction to arrange
the active speaker unit (25) on the right side and the passive speaker unit (3) on the left side is
given, the switching control means of the center unit (110) is the active speaker unit. The signal
switching circuit is switched so that the right channel sound signal is supplied to the speaker
(21) of (2) and the left channel sound signal is supplied to the speaker (31) of the passive
speaker unit (3).
[0013]
Thereafter, when one end of the speaker cable (4) is connected to the output terminal portion
(67) of the active speaker unit (25), the connection is detected, and based on the detection, the
signal switching circuit switches at that time. Locked on Then, the lock is held until one end of
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the speaker cable (4) is separated from the output terminal (67) of the active speaker unit (25).
[0014]
According to the present invention, in a speaker system including an active speaker unit and a
passive speaker unit, when replacing the arrangement of both speaker units, the user selectively
connects one cable to one of the two terminal portions. Since the channels of both speaker units
can be switched between each other simply by performing an input operation instructing the
placement of the two or more speaker units, work compared to the conventional speaker system
in which two cables must be reconnected Becomes simpler.
[0015]
Hereinafter, an embodiment in which the present invention is embodied in a two-channel (stereo)
speaker system will be specifically described with reference to the drawings.
[0016]
First Embodiment As shown in FIG. 1, the speaker system according to the present embodiment
includes a center unit (1) that outputs two channels of sound signals for the left channel (Lch)
and the right channel (Rch), and a center unit (1). And an active speaker unit (2) connected via a
system cable (5), and a passive speaker unit (3) connected via an active speaker unit (2) and a
speaker cable (4).
[0017]
The center unit (1) incorporates two sound sources of a tuner (13) and a CD reproducing device
(14) in a cabinet (10), and the output end of the tuner (13) and the CD reproducing device (14) is
a selector (15). And the left channel acoustic signal and the right channel acoustic signal
obtained from one of the sound sources selected by the selector (15) are connected to the
acoustic signal processing circuit (12). After receiving the necessary signal processing, the
voltage is applied to the system cable terminal (16) attached to the cabinet (10).
The switching operation of the selector (15) is controlled by the control circuit (11).
Further, the cabinet (10) incorporates a power supply circuit (19) for supplying power to
necessary circuit parts.
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[0018]
The system cable (5) includes the left channel acoustic signal line (51), the right channel acoustic
signal line (52), the control signal line (55), the first detection signal line (56) and the second
detection signal line (57). It comprises five signal lines, and one end of the system cable (5) is
connected to the system cable terminal (16) of the center unit (1).
[0019]
The active speaker unit (2) comprises a cabinet (20) forming an acoustic space, in which a
speaker (21) is provided and the other end of the system cable (5) is connected The system cable
terminal (8) to be installed is attached.
The system cable terminal (8) includes a left channel audio signal input terminal (81), a right
channel audio signal input terminal (82), a first detection signal output terminal (83), a second
detection signal output terminal (84), and control. There are five terminals of the signal input
terminal (88).
[0020]
The left channel audio signal input terminal (81) and the right channel audio signal input
terminal (82) of the system cable terminal (8) are connected via a selector (7) composed of a pair
of changeover switches (71) (72) , The first amplifier (23) and the second amplifier (24), and by
switching the selector (7), the left channel acoustic signal input terminal (81) is connected to the
first amplifier (23) and The first connection state in which the channel acoustic signal input
terminal (82) is connected to the second amplifier (24), and conversely, the left channel acoustic
signal input terminal (81) is connected to the second amplifier (24) A second connection state in
which the sound signal input terminal (82) is connected to the first amplifier (23) can be set.
Necessary power is supplied to the first amplifier (23) and the second amplifier (24) from the
power supply circuit (29).
[0021]
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The output end of the first amplifier (23) is connected to the speaker (21), and the output end of
the second amplifier (24) is connected via the first branch line (86) and the second branch line
(87) to the cabinet ( 20) are respectively connected to the first output terminal (6) and the
second output terminal (60) attached thereto. The first output terminal (6) comprises an output
terminal (61), a ground terminal (62) and a detection terminal (63), and the second output
terminal (60) comprises an output terminal (64), a ground terminal (65) And a detection terminal
(66).
[0022]
The control signal obtained from the control signal input terminal (88) of the system cable
terminal (8) is supplied to the selector (7). The detection terminal (63) of the first output terminal
portion (6) is connected to the first detection signal output terminal (83) of the system cable
terminal portion (8) via the pull-up resistor R1. The detection terminal (66) of the second output
terminal (60) is connected to the second detection signal output terminal (84) of the system
cable terminal (8) through the pull-up resistor R2.
[0023]
The speaker cable (4) is composed of three signal lines: an acoustic signal line (41), an earth line
(42) and a detection signal line (43). One end of the speaker cable (4) is an active speaker unit It
is connected to the 1st output terminal part (6) or 2nd output terminal part (60) of 2). The
passive speaker unit (3) comprises a cabinet (30) forming an acoustic space, and the cabinet (30)
is provided with a speaker (31), and the other end of the speaker cable (4) is a passive speaker
unit ( 3) connected. Thus, the ground wire (43) of the speaker cable (4) is grounded in the
passive speaker unit (3).
[0024]
In the above speaker system, as shown in FIG. 1, when the active speaker unit (2) is disposed on
the left side and the passive speaker unit (3) is disposed on the right side, the speaker extending
from the passive speaker unit (3) The cable (4) is connected to the first output terminal (6) of the
active speaker unit (2). Thereby, the detection signal line (43) of the speaker cable (4) is
09-05-2019
8
connected to the detection terminal (63) of the first output terminal (6), and the first detection
signal output terminal (8) of the system cable terminal (8) 83) is grounded and goes low. On the
other hand, since the detection terminal (66) of the second output terminal section (60) is in an
open state, the second detection signal output terminal (84) of the system cable terminal section
(8) is pulled up to have a high potential. It becomes. The high / low potential state of the first
detection signal output terminal (83) and the second detection signal output terminal (84) of the
system cable terminal portion (8) is determined by the first detection signal line (56 of the
system cable (5). And the second detection signal line (57) from the system cable terminal (16) of
the center unit (1) to the control circuit (11), whereby the speaker cable (4) is Connection to the
first output terminal portion (6) of.
[0025]
Therefore, the control circuit (11) of the center unit (1) is a control signal for switching the two
changeover switches (71) (72) of the selector (7) of the active speaker unit (2) to the terminals a
and c respectively. And transmit the control signal to the control signal input terminal (88) of the
active speaker unit (2) through the control signal line (55) of the system cable (5). Thereby, the
control signal is supplied to the selector (7), and the two changeover switches (71) and (72) are
switched to the terminals a and c, respectively.
[0026]
As a result, the left channel sound signal output from the sound signal processing circuit (12) of
the center unit (1) passes through the left channel sound signal line (51) of the system cable (5)
to the active speaker unit (2) The sound signal is supplied to the speaker (21) through the
selector switch (71) of the selector (7) and the first amplifier (23). Also, the right channel sound
signal output from the sound signal processing circuit (12) of the center unit (1) is supplied to
the active speaker unit (2) through the right channel sound signal line (52) of the system cable
(5). The acoustic signal is applied to the output terminal (61) of the first output terminal (6)
through the selector switch (72) of the selector (7) and the second amplifier (24). Then, the
acoustic signal is supplied to the speaker (31) of the passive speaker unit (3) through the
acoustic signal line (41) of the speaker cable (4). Thus, the sound of the left channel is emitted
from the active speaker unit (2) arranged on the left side, and the sound of the right channel is
emitted from the passive speaker unit (3) arranged on the right side.
[0027]
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9
On the other hand, as shown in FIG. 2, when the active speaker unit (2) is disposed on the right
side and the passive speaker unit (3) is disposed on the left side, the speaker cable (from the
passive speaker unit (3) 4) is connected to the second output terminal (60) of the active speaker
unit (2). As a result, the detection signal line (43) of the speaker cable (4) is connected to the
detection terminal (66) of the second output terminal (60), and the second detection signal
output terminal (8) of the system cable terminal (8) 84) is grounded and has a low potential. On
the other hand, since the detection terminal (63) of the first output terminal section (6) is in the
open state, the first detection signal output terminal (83) of the system cable terminal section (8)
is pulled up to have a high potential. It becomes. The high / low potential state of the first
detection signal output terminal (83) and the second detection signal output terminal (84) of the
system cable terminal portion (8) is determined by the first detection signal line (56 of the
system cable (5). And the second detection signal line (57) from the system cable terminal (16) of
the center unit (1) to the control circuit (11), whereby the speaker cable (4) is Connection to the
second output terminal portion (60) of.
[0028]
Therefore, the control circuit (11) of the center unit (1) is a control signal for switching the two
changeover switches (71) (72) of the selector (7) of the active speaker unit (2) to the terminals b
and d respectively. And transmit the control signal to the control signal input terminal (88) of the
active speaker unit (2) through the control signal line (55) of the system cable (5). By this, the
control signal is supplied to the selector (7), and the two changeover switches (71) and (72) are
switched to the terminals b and d respectively.
[0029]
As a result, the left channel sound signal output from the sound signal processing circuit (12) of
the center unit (1) passes through the left channel sound signal line (51) of the system cable (5)
to the active speaker unit (2) The sound signal is supplied to the output terminal (64) of the
second output terminal (60) through the selector switch (72) of the selector (7) and the second
amplifier (24). Then, the acoustic signal is supplied to the speaker (31) of the passive speaker
unit (3) through the acoustic signal line (41) of the speaker cable (4). Also, the right channel
sound signal output from the sound signal processing circuit (12) of the center unit (1) is
supplied to the active speaker unit (2) through the right channel sound signal line (52) of the
system cable (5). The acoustic signal is supplied to the speaker (21) through the selector switch
09-05-2019
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(71) of the selector (7) and the first amplifier (23). Thus, the left-channel sound is emitted from
the passive speaker unit (3) arranged on the left side, and the right-channel sound is emitted
from the active speaker unit (2) arranged on the right side.
[0030]
As described above, in the speaker system of the present embodiment, when it is necessary to
replace the arrangement of the active speaker unit (2) and the passive speaker unit (3), the user
arranges both the speaker units (2) and (3) Therefore, the selector (7) can be switched
automatically simply by connecting the speaker cable (4) to the first output terminal (6) or the
second output terminal (60) of the active speaker unit (2). Because the channels of both speaker
units (2) and (3) are switched to each other, the cable connection operation is simplified
compared to the conventional speaker system in which two cables need to be reconnected. It
becomes.
[0031]
Second Embodiment As shown in FIG. 3, the speaker system of the present embodiment includes
a center unit (110) that outputs two channels of acoustic signals of the left channel (Lch) and the
right channel (Rch), and a center unit (110). And an active speaker unit (25) connected via a
system cable (5), and a passive speaker unit (3) connected via an active speaker unit (25) and a
speaker cable (4).
[0032]
The center unit (110) incorporates two sound sources of the tuner (13) and the CD reproducing
device (14) in the cabinet (111), and the output end of the tuner (13) and the CD reproducing
device (14) is a selector The left channel acoustic signal and the right channel acoustic signal
which are connected to the acoustic signal processing circuit (12) via (15) and obtained from any
one sound source selected by the selector (15) are acoustic signal processing circuits After
receiving necessary signal processing in (12), it is sent out to the system cable (5).
The switching operation of the selector (15) is controlled by the control circuit (18).
In addition, the cabinet (111) incorporates a power supply circuit (19) for supplying power to
necessary circuit parts.
09-05-2019
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[0033]
Furthermore, an input operation device (17) is connected to the center unit (110) by wire or
wireless, and the user operates the input operation device (17) to perform various operations on
the control circuit (18). Instructions will be given.
[0034]
The system cable (5) comprises four signal lines: left channel sound signal line (51), right
channel sound signal line (52), control signal line (55) and detection signal line (58). One end
thereof is connected to the center unit (110).
[0035]
The active speaker unit (25) comprises a cabinet (26) forming an acoustic space, to which a
speaker (21) is provided and the other end of the system cable (5) is connected The system cable
terminal (80) to be installed is attached.
The system cable terminal (80) has four terminals: a left channel audio signal input terminal (81),
a right channel audio signal input terminal (82), a detection signal output terminal (85) and a
control signal input terminal (88). Yes.
[0036]
The left channel audio signal input terminal (81) and the right channel audio signal input
terminal (82) of the system cable terminal (80) are connected via a selector (7) composed of a
pair of changeover switches (71) (72) , The first amplifier (23) and the second amplifier (24), and
by switching the selector (7), the left channel acoustic signal input terminal (81) is connected to
the first amplifier (23) and The first connection state in which the channel acoustic signal input
terminal (82) is connected to the second amplifier (24), and conversely, the left channel acoustic
signal input terminal (81) is connected to the second amplifier (24) A second connection state in
which the sound signal input terminal (82) is connected to the first amplifier (23) can be set.
Necessary power is supplied to the first amplifier (23) and the second amplifier (24) from the
power supply circuit (29).
09-05-2019
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[0037]
The output end of the first amplifier (23) is connected to the speaker (21), and the output end of
the second amplifier (24) is connected to the output terminal portion (67) attached to the cabinet
(26). The output terminal portion (67) comprises an output terminal (61), a ground terminal (62)
and a detection terminal (68).
[0038]
The control signal obtained from the control signal input terminal (88) of the system cable
terminal (80) is supplied to the selector (7). The detection terminal (68) of the output terminal
section (67) is connected to the detection signal output terminal (85) of the system cable
terminal section (80) via the pull-up resistor R.
[0039]
The speaker cable (4) is composed of three signal lines: an acoustic signal line (41), an earth line
(42) and a detection signal line (43). One end of the speaker cable (4) is an active speaker unit
25) output terminal portion (67). The passive speaker unit (3) comprises a cabinet (30) forming
an acoustic space, and the cabinet (30) is provided with a speaker (31), and the other end of the
speaker cable (4) is a passive speaker unit ( 3) connected. Thus, the ground wire (43) of the
speaker cable (4) is grounded in the passive speaker unit (3).
[0040]
In the above speaker system, as shown in FIG. 3, when the active speaker unit (2) is disposed on
the left side and the passive speaker unit (3) is disposed on the right side, the user operates the
input operation device (17). By operation, an instruction to take the arrangement is given to the
center unit (110). In response to this, the control circuit (18) of the center unit (110) switches
the two changeover switches (71) (72) of the selector (7) of the active speaker unit (25) to the
terminals a and c respectively. The control signal is sent to the control signal input terminal (88)
of the active speaker unit (25) through the control signal line (55) of the system cable (5).
09-05-2019
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Thereby, the control signal is supplied to the selector (7), and the two changeover switches (71)
and (72) are switched to the terminals a and c, respectively.
[0041]
Thereafter, when one end of the speaker cable (4) is connected to the output terminal portion
(67) of the active speaker unit (25), the detection signal line (43) of the speaker cable (4) is an
output of the active speaker unit (25) The detection signal output terminal (85) of the system
cable terminal (80) is grounded by being connected to the detection terminal (68) of the terminal
(67), and changes from high potential to low potential. The switching of the potential of the
detection signal output terminal (85) of the system cable terminal section (80) from high to low
is performed through the detection signal line (58) of the system cable (5), and the control circuit
of the center unit (110). The signal is taken into (18), whereby it is detected that the speaker
cable (4) is connected to the output terminal (67) of the active speaker unit (25).
[0042]
Therefore, the control circuit (18) of the center unit (110) locks the selector (7) of the active
speaker unit (25) in the switching state shown in FIG. 3 based on the detection, and the speaker
cable (4) is active. The lock is held as long as it is connected to the output terminal (67) of the
speaker unit (25).
[0043]
In this manner, the left channel sound signal output from the sound signal processing circuit 12
of the center unit 110 is set to the system cable 5 by setting the selector 7 to the switching state
shown in FIG. Through the left channel acoustic signal line (51) to the active speaker unit (25),
the acoustic signal passes through the selector switch (71) of the selector (7) and the first
amplifier (23), 21).
The right channel sound signal output from the sound signal processing circuit (12) of the center
unit (110) is supplied to the active speaker unit (25) through the right channel sound signal line
(52) of the system cable (5). The acoustic signal is applied to the output terminal (61) of the
output terminal (67) through the selector switch (72) of the selector (7) and the second amplifier
(24). Then, the acoustic signal is supplied to the speaker (31) of the passive speaker unit (3)
through the acoustic signal line (41) of the speaker cable (4). Thus, the sound of the left channel
09-05-2019
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is emitted from the active speaker unit (2) arranged on the left side, and the sound of the right
channel is emitted from the passive speaker unit (3) arranged on the right side.
[0044]
On the other hand, as shown in FIG. 4, when the active speaker unit (2) is disposed on the right
side and the passive speaker unit (3) is disposed on the left side, the user operates the input
operation device (17). And instructs the center unit (110) to take the placement. In response to
this, the control circuit (18) of the center unit (110) switches the two changeover switches (71)
(72) of the selector (7) of the active speaker unit (25) to the terminals b and d respectively. The
control signal is sent to the control signal input terminal (88) of the active speaker unit (25)
through the control signal line (55) of the system cable (5). By this, the control signal is supplied
to the selector (7), and the two changeover switches (71) and (72) are switched to the terminals b
and d respectively.
[0045]
Thereafter, when one end of the speaker cable (4) is connected to the output terminal portion
(67) of the active speaker unit (25), the detection signal line (43) of the speaker cable (4) is an
output of the active speaker unit (25) The detection signal output terminal (85) of the system
cable terminal (80) is grounded by being connected to the detection terminal (68) of the terminal
(67), and changes from high potential to low potential. The switching of the potential of the
detection signal output terminal (85) of the system cable terminal section (80) from high to low
is performed through the detection signal line (58) of the system cable (5), and the control circuit
of the center unit (110). The signal is taken into (18), whereby it is detected that the speaker
cable (4) is connected to the output terminal (67) of the active speaker unit (25).
[0046]
Therefore, the control circuit (18) of the center unit (110) locks the selector (7) of the active
speaker unit (25) in the switching state shown in FIG. 4 based on the detection, and the speaker
cable (4) is active. The lock is held as long as it is connected to the output terminal (67) of the
speaker unit (25).
[0047]
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In this manner, the left channel sound signal output from the sound signal processing circuit 12
of the center unit 110 is set to the system cable 5 by setting the selector 7 to the switching state
shown in FIG. ) Through the left channel acoustic signal line (51) to the active speaker unit (25),
the acoustic signal passes through the selector switch (72) of the selector (7) and the second
amplifier (24), and the output terminal It is applied to the output terminal (61) of the part (67).
Then, the acoustic signal is supplied to the speaker (31) of the passive speaker unit (3) through
the acoustic signal line (41) of the speaker cable (4). The right channel sound signal output from
the sound signal processing circuit (12) of the center unit (110) is supplied to the active speaker
unit (25) through the right channel sound signal line (52) of the system cable (5). The acoustic
signal is supplied to the speaker (21) through the selector switch (71) of the selector (7) and the
first amplifier (23). Thus, the left-channel sound is emitted from the passive speaker unit (3)
arranged on the left side, and the right-channel sound is emitted from the active speaker unit
(25) arranged on the right side.
[0048]
As described above, in the speaker system of the present embodiment, when it is necessary to
replace the arrangement of the active speaker unit (25) and the passive speaker unit (3), the user
arranges both the speaker units (25) and (3). Therefore, the selector (7) is automatically switched
only by operating the input operation device (17), and the channels of both speaker units (25)
and (3) are switched to each other. As compared with the conventional speaker system which
had to perform reconnection, the cable connection work is simplified.
[0049]
In addition, once the speaker cable (4) is connected to the active speaker unit (25), the switching
state of the selector (7) is locked after that, so even if the user mistakenly operates the input
operation device (17), the selector ( 7) does not switch to a switching state which does not
correspond to the actual arrangement of the active speaker unit (25) and the passive speaker
unit (3).
When the speaker cable (4) is disconnected from the active speaker unit (25), the lock of the
selector (7) is released, and the selector (7) according to the arrangement of the active speaker
unit (25) and the passive speaker unit (3) Can be switched.
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16
[0050]
The configuration of each part of the present invention is not limited to the above embodiment,
and various modifications can be made within the technical scope described in the claims. For
example, the detection circuit for detecting to which output terminal unit the speaker cable is
connected in the first embodiment is not limited to the configuration using the detection
terminals (63) and (66) and the pull-up resistors R1 and R2, Various known configurations can
be employed. Further, the present invention is not limited to the configuration in which the two
output terminal portions (6) and (60) are provided in the active speaker unit (2), the
configuration in which the system cable terminal portions (8) are provided in two places, and the
system cable of the center unit (1) It is also possible to adopt a configuration in which the
terminal portion (16) is provided at two places. Furthermore, in the above two embodiments, the
speaker system is configured by the speaker units of two channels, but it is also possible to
practice the present invention in a speaker system consisting of speaker units of more channels.
Furthermore, it is also possible to adopt a configuration in which the first embodiment and the
second embodiment are combined.
[0051]
It is a block diagram which shows the 1st connection state in the speaker system of 1st Example
of this invention. It is a block diagram which shows the 2nd connection state in the speaker
system same as the above. It is a block diagram which shows the 1st connection state in the
speaker system of 2nd Example of this invention. It is a block diagram which shows the 2nd
connection state in the speaker system same as the above. It is a block diagram which shows the
connection state of the conventional speaker system.
Explanation of sign
[0052]
(1) Center unit (11) Control circuit (16) System cable terminal section (17) Input operation
device (2) Active speaker unit (21) Speaker (23) 1st amplifier (24) 2nd amplifier (3) Passive
speaker Unit (31) Speaker (4) Speaker cable (5) System cable (6) 1st output terminal section (63)
Detection terminal (60) 2nd output terminal section (66) Detection terminal (7) Selector (71)
Selector switch (72) Switch (8) System cable terminal section (83) First detection signal output
terminal (84) Second detection signal output terminal
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