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JP2001036995

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DESCRIPTION JP2001036995
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
abnormality detection apparatus for automatically detecting an abnormality such as a short
circuit in a speaker circuit, for example, in a commercial broadcast apparatus or an emergency
broadcast apparatus. In particular, the present invention relates to a speaker line abnormality
detection device having a function of electrically disconnecting a speaker line in which the
abnormality has occurred from a broadcasting apparatus.
[0002]
2. Description of the Related Art Conventionally, when an abnormality occurs in a speaker circuit
as described above, in particular when the speaker circuit is short-circuited, a broadcasting
apparatus having a function of electrically disconnecting the shorted speaker circuit is
conventionally used. For example, there is one as shown in FIG. As shown in the figure, this
broadcast device is also referred to as a normal (N) line (or a hot (H) line). A) and a common
(COM) line 1b, a generally known two-wire speaker line 1 is provided, and one or more speakers
2 are connected in parallel between the lines 1a and 1b. (In the figure, only one speaker 2 is
described for convenience, but a plurality of the speakers 2 are usually provided for the speaker
line 1 in many cases). And one end (each one end of each line 1a and 1b) of this speaker line 1 is
connected to the output side of the amplifier 3 which amplifies and outputs the signal for
broadcast.
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1
[0003]
A relay switch circuit 4 is provided in the vicinity of the output side of the amplifier 3 on one of
the lines 1a and 1b, for example, the normal line 1a. The relay switch circuit 4 is turned on / off
in accordance with the switching control signal supplied from the CPU (central processing unit)
5, whereby the output side of the amplifier 3 and the normal line 1a are connected or
disconnected. The output side of 3 and the speaker line 1 are electrically connected or
disconnected.
[0004]
The CPU 5 generates the open / close control signal according to the operated state of the
operation unit 6 having a push button key corresponding to the relay switch circuit 4, for
example. At the same time, the CPU 5 turns on or off the relay switch circuit 4, that is, whether
the speaker line 1 is valid or invalid, for example, the display unit 7 having a light emitting diode
(LED) or liquid crystal (LCD) panel configuration. Display on The operation of the CPU 5 is
controlled in accordance with a program stored in the storage unit 8 having a semiconductor
memory configuration such as, for example, a ROM or a RAM.
[0005]
Furthermore, a fuse 9 for circuit protection is provided in the vicinity of the output side of the
amplifier 3 in the normal line 1a, for example, between the output side of the amplifier 3 and the
relay switch circuit 4. As the fuse 9, one having a standard (blowing characteristic) according to
the rated current of the speaker line 1 is used.
[0006]
The amplifier 3, the relay switch circuit 4, the CPU 5, the storage unit 8 and the fuse 9 are
incorporated, for example, in a casing of a broadcasting apparatus main body (not shown). And
the operation part 6 and the display part 7 are arrange | positioned, for example on the
operation panel which is not shown which comprises the front part of the said housing | casing.
In addition, the speaker line 1 is wired, for example, through the ceiling and the back of a wall in
a building using this broadcast apparatus, and each speaker 2 is appropriately connected to each
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2
broadcast target area, such as a hallway or a room in the building. Will be installed.
[0007]
According to the configuration of FIG. 6, when the speaker line 1 is normal, broadcasting by the
speaker line 1 (speaker 2) can be realized according to the ON / OFF state of the relay switch
circuit 4. Here, for example, it is assumed that a short circuit accident has occurred in the
speaker line 1. Then, it is assumed that the relay switch circuit 4 is turned on and a signal for
broadcast is input from the amplifier 3 to the speaker line 1. Then, an overcurrent (short circuit
current) caused by the input of the broadcast signal flows in the speaker line 1, and the fuse 9 is
fused. Thereby, the speaker line 1 and the amplifier 3 are electrically disconnected, and each
circuit including the speaker line 1 and the amplifier 3 is protected from the above-mentioned
overcurrent.
[0008]
By the way, in such a broadcasting apparatus, usually, as shown in, for example, FIG. 7, a
plurality of speaker lines 1 (M lines) are often provided. In such a case, the respective speaker
lines 1, 1,... Are connected in parallel to the amplifier 3 as shown in the figure. The relay switch
circuit 4 and the fuse 9 are provided for each of the speaker lines 1, 1,. Note that each relay
switch circuit 4, 4,... Is the operated state of the operation unit 6 (for example, the push button
key provided corresponding to each relay switch circuit 4, 4,. In accordance with the switching
control signal supplied from the CPU 5 in response to the above, the respective ON / OFF
operation is performed individually.
[0009]
According to the configuration of FIG. 7, when a short circuit accident occurs in a part of each
speaker line 1, 1,..., Fuse 9 in the shorted speaker line 1 is melted and Only the shorted speaker
line 1 is disconnected from the amplifier 3. Accordingly, since the other normal speaker lines 1,
1,... Can be connected to the amplifier 3 continuously, broadcasting can be continued by these
normal speaker lines 1, 1,.
[0010]
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3
Further, as another conventional example different from the above-mentioned FIG. 7, there is one
as shown in FIG. 8, for example. As shown in the figure, this is provided with current sensors 10,
10,... For each of the speaker lines 1, 1,. It is The respective current sensors 10, 10,... Individually
detect the current flowing in the respective speaker lines 1, 1,..., And the detection results thereof
are inputted to the CPU 5. The CPU 5 calculates each current value based on each detection
result obtained from each current sensor 10, 10,... (Ie, from the magnitude of each current value
detected and obtained by each current sensor 10, 10,. It is determined whether or not a short
circuit accident has occurred in the speaker lines 1, 1,. Then, if it is determined that any of the
speaker lines 1 is short circuited (that is, if the current value obtained by detection by any one of
the current sensors 10 is extremely large), the CPU 5 operates the operated unit 6. Regardless of
the state, the relay switch circuit 4 of the speaker line 1 determined to be short-circuited is
turned off. As a result, the speaker line 1 and the amplifier 3 shorted (strictly determined to be
shorted) are electrically disconnected from each other. Needless to say, the technology of using
the current sensor 10 instead of the fuse 9 as shown in FIG. 8 can also be applied to a broadcast
apparatus having only one speaker line 1 as shown in FIG.
[0011]
However, in the prior art shown in FIGS. 6 and 7, it is necessary to replace the fuse 9 every time
the speaker line 1 is short-circuited, and the operation is troublesome. There is a problem of
being there. This problem becomes more pronounced as the number of speaker lines 1, 1,. Also,
there is a problem that a spare fuse must be prepared in preparation for the short circuit
accident.
[0012]
On the other hand, according to the prior art shown in FIG. 8, there is no need to replace the fuse
or prepare a spare fuse. However, in a broadcasting apparatus provided with a plurality of
speaker lines 1, 1, ..., since it is necessary to provide a current sensor 10, 10, ... for each of the
speaker lines 1, 1, ... There is a problem that the configuration of each of the speaker lines 1, 1,...
Is complicated and the cost is increased. This problem also becomes more remarkable as the
number of speaker lines 1, 1,... Increases.
[0013]
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4
Further, in any of the above-described conventional techniques, since a short circuit accident can
be detected only when an overcurrent flows through the speaker line 1, for example, when the
level of the broadcast signal input from the amplifier 3 to the speaker line 1 is low ( In other
words, when the sound volume is low, the short circuit accident may not be detected. Therefore,
for example, there is also a problem that, despite the occurrence of the short circuit accident, it
may be left without being recognized.
[0014]
Therefore, according to the present invention, each speaker line 1 is provided without providing
the fuses 9, 9, ..., the current sensors 10, 10, ... for each of the speaker lines 1, 1, ... An object of
the present invention is to provide an abnormality detection device capable of detecting an
abnormality such as a short circuit of 1,. In addition, in order to realize the abnormality detection,
it is also an object of the present invention to be able to detect the abnormality even when the
level of the broadcast signal acting as a kind of inspection signal is low.
[0015]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a speaker circuit to which one or more speakers are connected, and a signal for
broadcasting output to be input to the speaker circuit. Broadcast signal output means, current
detection means for detecting the total current output from the broadcast signal output means by
the broadcast signal output means outputting the broadcast signal, and the broadcast signal
output means Voltage detection means for detecting the voltage output from the broadcast signal
output means by outputting a signal for the signal, a current value obtained by detection by the
current detection means, and detection obtained by the voltage detection means Impedance
deriving means for deriving the impedance value of the speaker line based on the voltage value,
and the speaker obtained by the impedance deriving means Determining means for making a
first determination when the impedance value of the line is greater than or equal to a
predetermined reference value and making a second determination when the impedance value is
less than the predetermined reference value It is a thing.
[0016]
Here, the above-mentioned broadcast signal output means means, for example, the abovementioned amplifier 3 etc., in the broadcast apparatus provided with the abnormality detection
device of the present invention, the broadcast signal input to the speaker line is finally output.
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Say the means to
[0017]
According to the present invention, when the broadcast signal is outputted from the broadcast
signal output means and inputted to the speaker line, a predetermined current flows from the
broadcast signal output means to the speaker line, and from the broadcast signal output means
to the speaker A predetermined voltage is applied to the line.
These currents and voltages are detected by current detection means and voltage detection
means, respectively.
Then, the impedance deriving means derives the impedance value of the speaker line based on
the current value and the voltage value obtained by the detection means.
[0018]
For example, it is assumed that the speaker line is not short circuited or normal. In this case, the
impedance value obtained by deriving the impedance is a predetermined impedance value
according to the wiring state of the speaker circuit, the number of speakers connected thereto,
and the like. On the other hand, if the speaker line is short-circuited, for example, its impedance
value becomes extremely small compared to the normal time. Therefore, as the predetermined
reference value, for example, a value between an impedance value when the speaker line is
normal and an impedance value when the speaker line is shorted is set. In this way, by
comparing the impedance value obtained by the impedance deriving means with the
predetermined reference value, it can be determined whether the speaker line is shorted. This
judgment is made by the judging means.
[0019]
Specifically, when the impedance value derived and obtained by the impedance deriving means is
equal to or greater than a predetermined reference value, the judging means considers that the
speaker line is normal and makes the first judgment. On the other hand, when the impedance
09-05-2019
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value is smaller than the predetermined reference value, the judging means makes the second
judgment on the assumption that the speaker circuit is short circuited. Therefore, the judging
means can recognize whether the speaker line is normal or shorted depending on which of the
first judgment and the second judgment is made.
[0020]
The same applies to the case where a plurality of speaker lines are connected in parallel to the
broadcast signal output means. That is, when each speaker line is normal, the impedance value
derived by the impedance deriving means is a predetermined impedance value according to the
number of speaker lines, the number of speakers, and the like. On the other hand, when one of
the speaker lines is short-circuited, the impedance value becomes extremely small. Therefore,
when the determination means makes the first determination, it can recognize that all the
speaker lines are normal. On the other hand, when the determination means makes the second
determination, it can be recognized that at least one or more speaker lines are shorted.
[0021]
In the present invention, in order to determine whether or not the speaker circuit is shortcircuited based on the impedance value of the speaker circuit, basically, a broadcast signal is
inputted from the broadcast signal output means to the speaker circuit. For example, regardless
of the level of the signal, it can be accurately determined whether or not the speaker circuit is
shorted. Therefore, even if the level (sound volume) of the broadcast signal is relatively small, a
short circuit of the speaker line can be detected.
[0022]
The predetermined reference value may be determined based on data obtained by measuring in
advance, for example, an impedance value when the speaker line is normal.
[0023]
Also, a first rated output condition relating to the total output of the broadcast signal output
means, such as a maximum output power value generally called a rated output, a maximum
amplitude value of an output voltage, or an allowable output current value The above
09-05-2019
7
predetermined reference value may be determined based on
In this way, it is not necessary to actually measure the impedance value of the speaker line as
described above.
[0024]
Furthermore, the above-mentioned broadcast signal output means is premised on, for example,
that a plurality of speaker lines are connected in parallel, and it is necessary to drive one speaker
line per line. If the second rated output condition is determined, the predetermined reference
value may be determined based on the second rated output condition. That is, the predetermined
reference value is obtained based on the maximum output power value per line, which is
generally called control power, the maximum amplitude value of the output voltage, the
allowable output current value, or the like. When a plurality of speaker lines are connected in
parallel to the broadcast signal output means, the number of the speaker lines actually connected
is also taken into consideration. Specifically, for example, based on the second rated output
condition, a predetermined reference value in the case where there is only one speaker line is
determined. Then, the value obtained and obtained is divided by the number of speaker lines
actually connected, and the value obtained by dividing is obtained as the predetermined
reference value when a plurality of speaker lines are connected. I assume.
[0025]
In the present invention, switching means for electrically connecting or disconnecting between
the output side of the broadcast signal output means and the input side of the speaker line
according to the switching control signal is provided between the output side of the broadcast
signal output means and the speaker line. When the means makes the second determination, the
control means generates the opening / closing control signal in a state of receiving it and
disconnecting between the broadcast signal output means and the speaker line, and supplying
the opening / closing control signal to the opening / closing means. You may provide.
[0026]
Thus, by providing the opening / closing means and the control means for controlling the same
according to the judgment by the judgment means, when the speaker line is shorted, the shorted
speaker line is automatically transmitted from the broadcast signal output means. Can be
09-05-2019
8
separated.
In this way, it is possible to protect each circuit of the broadcast apparatus including the speaker
circuit and the broadcast signal output unit from the overcurrent flowing due to the short circuit
of the speaker circuit.
[0027]
The opening / closing means referred to here can be constituted by, for example, a relay circuit
or the like. In particular, a broadcasting apparatus provided with the abnormality detection
device according to the present invention is originally a means such as the relay switch circuit 4
described above between the output side of the broadcast signal output means and the input side
of the speaker line, When provided with means for switching the valid and invalid states of the
speaker line according to the operated state, this can be diverted as the opening and closing
means. In this way, it is not necessary to provide a dedicated opening / closing means to realize
the present invention. Further, in this case, if means originally provided for controlling the relay
switch circuit 4 as in the CPU 5 described above is used as control means in the present
invention, the operation of the means is specifically controlled. If the program for rewriting is
rewritten, it is not necessary to provide a dedicated control means.
[0028]
Furthermore, when a plurality of speaker lines are connected in parallel to the broadcast signal
output means, opening and closing means are provided for each of the speaker lines. The control
means is configured to, for example, disconnect between the broadcast signal output means and
all the speaker lines by the respective opening / closing means when the determination means
makes the second determination (strictly speaking, this means To generate the switching control
signal for controlling the switching means.
[0029]
According to this structure, all the speaker lines can be automatically disconnected from the
broadcast signal output means when any of the speaker lines is short-circuited, and all the
speaker lines and the broadcast signal output means are included. Each circuit can be reliably
protected from the overcurrent caused by the short circuit.
09-05-2019
9
[0030]
Further, in the case where a plurality of speaker lines are provided as described above and the
opening / closing means is provided for each of the speaker lines, for example, when the
determination means makes the second determination, each opening / closing means Means for
sequentially connecting or disconnecting each speaker line to the broadcast signal output means
in a predetermined order in a state in which part of each speaker line is connected to the
broadcast signal output means and the rest is disconnected. It may be configured.
At that time, if it is confirmed which of the first judgment and the second judgment is to be made
by the judgment means, which of the speaker lines is connected to the broadcast signal output
means will make the second judgment, That is, it can be specified which speaker line is shorted.
Then, by providing information output means for outputting information representing a speaker
line identified as being short-circuited by the control means, it is possible to easily recognize
which speaker line is short-circuited from the information.
[0031]
The information output means does not output information representing the speaker line
identified as short-circuited by the control means, but outputs information representing the other
speaker lines, that is, normal speaker lines. It may be configured as follows. Further, information
may be output that represents both of the normal speaker line and the speaker line identified as
having a short circuit. And the information said here may be output in a visual form by using
display means, such as a light emitting diode and a liquid crystal panel, for example, and may be
output in the auditory form, such as an audio | voice and a warning.
[0032]
Here, as described above, for example, the following two procedures may be mentioned as
specific procedures for sequentially connecting or disconnecting the speaker lines to the
broadcast signal output means in the predetermined order by the control means. Be That is, as
the first procedure, when the determination means makes the second determination (that is,
when any of the speaker lines is shorted), the broadcast signal output means is once
disconnected from all the speaker lines. . Then, in this state, the speaker lines are sequentially
09-05-2019
10
connected to the broadcast signal output means in units of a predetermined number of lines, for
example, one by one. Thus, all the speaker lines are connected to the above-mentioned broadcast
signal output means one by one independently, and in this state, if it is confirmed which of the
first judgment and the second judgment the above judgment means makes, It is possible to
reliably check whether or not each of the speaker lines is shorted.
[0033]
On the other hand, in the second procedure, contrary to the above-mentioned first procedure,
when the judging means makes the second judgment, the broadcast signal output means and all
the speaker lines are once connected. In this state, the broadcast signal output means
sequentially disconnects each speaker line, for example, one line at a time, in units of a
predetermined number of lines. That is, by connecting all the speaker lines to the broadcast
signal output means, the current detection means intentionally outputs the overcurrent detection
signal. Then, each speaker line is disconnected alone from the broadcast signal output means,
and in the process, the point at which the determination means does not make the second
determination, in other words, the point at which the determination means makes the first
determination Do. In this way, the speaker circuit in the state of being separated from the
broadcast signal output means is shorted at the time when the determination means does not
make the second determination (at the time when the determination means makes the first
determination) It can be identified as
[0034]
The second procedure can often detect a shorted speaker line earlier than the first procedure.
However, according to the first procedure, it is possible to reliably check whether or not each of
the speaker lines is shorted, whereas according to the second procedure, a plurality of speaker
lines are simultaneously shorted. Sometimes this is very difficult to detect.
[0035]
Therefore, when the determination means makes the second determination, first, each speaker
line is inspected in accordance with the second procedure. When the shorted speaker line can be
detected by the second procedure, the information output means outputs information
representing that effect. Then, if it is not possible to identify a shorted speaker line by the second
09-05-2019
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procedure, that is, if a plurality of speaker lines are simultaneously shorted, all the speaker lines
are shorted according to the first procedure. Check if it is In this way, a shorted speaker line can
be detected early and reliably.
[0036]
Further, as for the control means, after the shorted speaker line is specified as described above,
the shorted speaker line (in other words, the speaker line specified as the cause of the second
judgment made by the judgment means. ) May be disabled, and only other normal speaker lines
may be enabled. Here, to invalidate the speaker line means, for example, an operation
corresponding to the shorted speaker line (more specifically, an operation corresponding to the
opening / closing means provided between the shorted speaker line and the broadcast signal
output means). We say to invalidate operation by means.
[0037]
According to this structure, even if one of the speaker lines is shorted and the shorted speaker
line becomes unusable, the broadcast can be continued by the other normal speaker lines.
[0038]
Further, as to the judging means, rather than comparing the impedance value obtained by the
impedance deriving means with the predetermined reference value as described above, whether
the impedance value is within a predetermined range It may be configured to make the first
judgment or the second judgment depending on whether or not it is.
According to this configuration, not only the short circuit of the speaker circuit but also the
disconnection can be detected.
[0039]
That is, when the speaker line is disconnected, the impedance value obtained by the abovementioned impedance derivation becomes extremely large. Therefore, as the predetermined
range, for example, a range (upper limit value and lower limit value) in which a slight margin
09-05-2019
12
(margin) is added to the impedance value when the speaker circuit is normal is set. In this way,
when the impedance value derived and obtained by the impedance deriving means is within this
predetermined range, it can be considered that the loudspeaker circuit is normal, and the
impedance value is outside the predetermined range. The speaker line can be considered to be
shorted or broken when the
[0040]
Furthermore, when the impedance value is out of the predetermined range, the abnormality of
the speaker circuit is a short circuit depending on whether the impedance value is smaller than
the lower limit value of the predetermined range or larger than the upper limit value. It is
possible to determine if it is or if it is broken. That is, when the impedance value is smaller than
the lower limit value of the predetermined range, it is possible to determine that the speaker line
is short circuited, and when the impedance value is larger than the upper limit value, the speaker
line is disconnected.
[0041]
When a plurality of speaker lines are connected in parallel to the broadcast signal output means,
the impedance of the entire speaker line is determined by the number of speaker lines actually
connected, the number of speakers, etc. The value changes. Therefore, when detecting the
disconnection of the speaker line based on the predetermined range, the predetermined range is
changed each time according to the number of speaker lines, the number of speakers, and the
like.
[0042]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker line abnormality
detecting apparatus according to the present invention will be described with reference to FIGS.
1 to 5. FIG.
[0043]
FIG. 1 shows a schematic configuration of a broadcast apparatus provided with the abnormality
detection apparatus of the present embodiment.
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As shown in the figure, in the present embodiment, a current sensor 11 is provided in place of
the fuse 9 and a voltage sensor 12 is provided in the vicinity of the output side of the amplifier 3
in the prior art shown in FIG. is there. Among these, the current sensor 11 detects the total
output current I of the amplifier 3 and supplies current data obtained by this detection to the
CPU 5. On the other hand, the voltage sensor 12 detects the voltage between the lines 1 a and 1
b of the speaker line 1, that is, the output voltage V of the amplifier 2 near the output side of the
amplifier 3. Supply. The CPU 5 calculates the impedance Zs of the speaker line 1 by the following
equation 1, for example, based on the data I and V supplied from the sensors 11 and 12,
respectively.
[0044]
[Equation 1]
[0045]
Here, for example, it is assumed that the speaker line 1 is not short-circuited or normal.
Then, it is assumed that the relay switch circuit 4 is turned on and the amplifier 1 outputs a
broadcast signal. In this case, the impedance Zs of the speaker line 1 obtained by the above
equation 1 has a value corresponding to, for example, the wiring state of the speaker line 1, the
number of connected speakers 1, and the like. On the other hand, assuming that the speaker line
1 is short-circuited, for example, the impedance Zs becomes extremely small compared to the
normal time, and the so-called amplifier 3 is overloaded.
[0046]
Therefore, a certain reference value Z0 is determined for the impedance ZS. Then, if this
reference value Z0 is compared with the impedance ZS obtained by the above equation 1, it can
be determined whether or not the speaker line 1 is shorted.
[0047]
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14
Specifically, the reference value Z0 is determined, for example, by the following equation (2). In
Equation 2, E is the maximum amplitude of the output voltage of the amplifier 3, and for
example, in the case of a specification generally referred to as a 100 [V (volt)] line, E = 100 [V
(volt) ]. Further, PA is the maximum output power [W (watt)] of the amplifier 3 and is a value
generally referred to as a rated output in the specification of the amplifier 3. Further, α is a
margin related to the rated output PA, and for example, a value of 1/3 to 1/2 of the rated output
PA is set.
[0048]
[Equation 2]
[0049]
That is, the reference value Z0 determined by the equation 2 is the lowest value of the impedance
Zs of the speaker line 1 which can be driven by the amplifier 3 and is a so-called allowable
impedance value.
Therefore, when the impedance ZS obtained by the above equation 1 is equal to or more than
this allowable impedance Z0 (ZS Z Z0), it can be regarded that at least the speaker line 1 is not
short circuited. It is determined that the speaker line 1 is normal, and the ON state of the relay
switch circuit 4 is maintained. On the other hand, when the impedance ZS obtained by the
equation 1 is smaller than the allowable impedance Z0 (ZS <Z0), the CPU 5 determines that the
speaker line 1 is short circuited, and the relay switch circuit 4 is determined. Turn off. As
described above, when the speaker line 1 is short-circuited, the relay switch circuit 4 is turned off
to disconnect the speaker line 1 from the amplifier 3. Then, each circuit of this broadcasting
apparatus including the speaker line 1 and the amplifier 3 is It can protect against over current
due to short circuit.
[0050]
By the way, when a plurality of speaker lines 1 (M lines) are provided for the amplifier 3, for
example, as shown in FIG. 2, each speaker line is provided on the output side (right side of FIG. 2)
of the current sensor 11. Connect 1, 1, ... in parallel. Thus, the impedance Zs of all the speaker
lines 1, 1,... Connected to the amplifier 3 is obtained by the above equation 1 based on the
09-05-2019
15
respective data I, V obtained by detection by the respective sensors 11, 12. Then, as described
above, by comparing the impedance ZS with the reference value Z0, it is determined whether or
not each of the speaker lines 1, 1, ... has a short circuit.
[0051]
However, when a plurality of speaker lines 1, 1,... Are provided as shown in FIG. 2, the number of
speaker lines 1 actually connected to the amplifier 3 (in other words, in the ON state) The
number of relay switch circuits 4 L changes the impedance Zs when each of the speaker lines 1,
1,... Is normal. Therefore, it is necessary to change the reference value Z0 according to the
change of the impedance Zs, that is, according to the number of the speaker lines 1 actually
connected to the amplifier 3.
[0052]
Therefore, in addition to the equation (2), the reference value Z0 is determined by the following
equation (3) according to the number L of the speaker lines 1 actually connected to the amplifier
3. In the equation (3), P1 is the maximum output power [W] per line that can be driven by the
amplifier 3 and is a value generally called control power in view of the specification of the
amplifier 3. Also, β is a margin relating to the control power P1, and for example, a value of 1/3
to 1/2 of the control power P1 is set.
[0053]
[Equation 3]
[0054]
As described above, if the reference value Z0 is changed according to the number L of the
speaker lines 1 actually connected to the amplifier 3, the speaker lines 1, 1,. · It can be
determined whether or not any of them is shorted.
The quality judgment is made based on both the reference value Z0 obtained and obtained by the
equation 3 and the reference value Z0 obtained and obtained by the equation 2, and the above-
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mentioned number is more than any of the reference values Z0. When the impedance Zs
obtained by 1 is smaller, it is determined that at least one or more of the speaker lines 1 are
short-circuited.
[0055]
However, the CPU 5 can not identify which speaker line 1 is shorted only by recognizing that the
impedance Zs is smaller than the reference value Z0, that is, the impedance Zs is abnormal.
Therefore, when the CPU 5 detects an abnormality in the impedance ZS, the CPU 5 immediately
enters the routine of FIG. 3 in order to identify which speaker line 1 has a short circuit. A
program for operating the CPU 5 according to the routine of FIG. 3 is stored in the storage unit 8.
[0056]
As shown in the figure, when the CPU 5 detects an abnormality in the impedance ZS (YES in step
S2), first, each relay switch circuit 4, 4,... The OFF state, that is, the valid / invalid state of each of
the speaker lines 1, 1,... Is stored (step S4). Then, all the relay switch circuits 4, 4,... Are
temporarily turned off to disconnect all the speaker lines 1, 1,... From the amplifier 3 (step S6).
[0057]
Next, as an initial setting of this routine, the CPU 5 sets an index [m] representing the number of
each speaker line 1, 1,... To "m = 1" (step S8). After this initial setting, the CPU 5 turns on only the
relay switch circuit 4 of line number [m], and the speaker line 1 of this line number [m]
(hereinafter referred to as a code representing the speaker line 1) Use the number [m] together. )
Is connected to the amplifier 3 (step S10), and in this state, it is checked whether the impedance
ZS is abnormal (step S12). Here, when the abnormality of the impedance Zs is confirmed (in the
case of YES), the CPU 5 determines that the speaker line [m] currently connected to the amplifier
3 is short-circuited. Then, after the speaker line [m] is stored in the storage unit 8 as the
abnormal line [X] (step S14), the speaker line [m] is disconnected from the amplifier 3 (step S16).
On the other hand, when the abnormality of the impedance ZS can not be confirmed in the step
S12 (in the case of NO), the CPU 5 determines that at least the speaker line [m] currently
connected to the amplifier 3 is not shorted, The process passes step S14 and proceeds to step
S16.
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[0058]
After disconnecting the speaker line [m] from the amplifier 3 in step S16, the CPU 5 performs
step S10 in the order of the line numbers [m] for all the remaining speaker lines 1, 1,. Step 16 is
repeated (steps S18 and S20).
[0059]
After executing the processing from step S10 to step S16 for all the speaker lines 1, 1,..., The CPU
5 executes the information representing the abnormal line [X] stored in step S14. It displays on
the display part 7 (step S22).
At the same time, the CPU 5 fixes the relay switch circuit 4 of the abnormal line [X] in the OFF
state, and subsequently disables the ON / OFF control of the relay switch circuit 4 of the
abnormal line [X] by the operation unit 6 (Step S24). Then, for the other normal speaker lines 1,
1,... Excluding the abnormal line [X], the respective valid / invalid states are restored based on the
stored contents in step S4 (step S26), Exit this routine.
[0060]
As described above, according to the routine of FIG. 3, it is possible to individually check whether
or not each of the speaker lines 1, 1,... Then, for the abnormal line [X], the information indicating
that is displayed on the display unit 7, so the line number [m] of the abnormal line [X] can be
easily recognized.
[0061]
Although the abnormal line [X] is invalidated, the other normal speaker lines 1, 1,... Can be used
continuously. Therefore, even if part of the speaker lines [X] is shorted, broadcasting can be
continued by the other normal speaker lines 1, 1,...
[0062]
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In the routine shown in FIG. 3, with all the speaker lines 1, 1,... Separated from the amplifier 3,
each speaker line 1, 1,. Although the abnormal line [X] is specified by connecting to the amplifier
3, conversely, with all the speaker lines 1, 1,... Connected to the amplifier 3, each speaker line 1,
1. The abnormal line [X] can also be specified by disconnecting the line 1 to line 3 individually
from the amplifier 3. This procedure will be described with reference to FIG.
[0063]
That is, when the CPU 5 recognizes an abnormality in the impedance Zs (YES in step S30), first,
each ON / OFF state of each relay switch circuit 4, 4,. The valid / invalid states of the speaker
lines 1, 1,... Are stored (step S32). Then, all the relay switch circuits 4, 4,... Are once turned ON,
and all the speaker lines 1, 1,... Are connected to the amplifier 3 (step S34). Further, as the initial
setting, the line number [m] is set to “m = 1” (step S36).
[0064]
After the above-mentioned initial setting, the CPU 5 turns off only the relay switch circuit 4 of
line number [m] and disconnects only the speaker line [m] from the amplifier 3 (step S38). Then,
in this state, it is checked whether or not the impedance Zs becomes equal to or more than the
reference value Z0, that is, whether or not the abnormality of the impedance Zs is eliminated
(step S40). Here, when the abnormality of the impedance ZS is eliminated (in the case of YES), the
CPU 5 judges that the speaker line [m] currently connected to the amplifier 3 is short-circuited,
and this is regarded as an abnormal line. It stores in the storage unit 8 as [X] (step S42). Then,
the information representing the abnormal line [X] is displayed on the display unit 7 (step S44),
and the relay switch circuit 4 of the abnormal line [X] is fixed in the OFF state. The ON / OFF
control of the relay switch circuit 4 of the abnormal line [X] is disabled (step S46). Then, after the
CPU 5 restores the respective valid / invalid states of the other normal speaker lines 1, 1,...
Excluding the abnormal line [X] based on the storage contents in the above step S32 ( Step S48),
this routine is exited.
[0065]
On the other hand, when the abnormality of the impedance ZS is not eliminated in the above step
09-05-2019
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S40 (in the case of NO), the CPU 5 reconnects the speaker line [m] to the amplifier 3 (step S50).
The steps S38 and S40 are executed in the order of the line numbers [m] for the remaining
speaker lines 1, 1,... Until the abnormality of the impedance Zs is resolved (steps S52 and S54).
[0066]
As described above, according to the procedure of FIG. 4, the CPU 5 exits this routine as soon as
the abnormal line [X] is identified. Therefore, the abnormal line [X] can be identified earlier as
compared with the procedure of FIG. 2 in which whether or not each of the speaker lines 1, 1,...
[0067]
However, according to the procedure of FIG. 4, when a plurality of speaker lines 1, 1,... Therefore,
if the abnormality in the impedance ZS is not resolved even if all the speaker lines 1, 1, ... are
individually separated from the amplifier 3 (i.e., in the case of YES in step S52), the CPU 5
performs the line individual inspection. The process (step S56) is executed, and specifically, the
operation is performed according to the procedure of FIG.
[0068]
As shown in the figure, the line individual process (step S56) is completely the same as the
process from step S6 to step S20 in FIG. 3, that is, the CPU 5 first performs all the relay switch
circuits. .. Are temporarily turned off to disconnect all the speaker lines 1, 1,... From the amplifier
3 (step S60). Then, as an initial setting in the line individual process, the line number [m] is set to
“m = 1” (step S62).
[0069]
Then, only the speaker line [m] is connected to the amplifier 3 (step S64), and in this state, it is
checked whether or not the impedance Zs is abnormal (step S66). Here, when the abnormality of
the impedance ZS is confirmed (in the case of YES), the CPU 5 stores the speaker line [m] as the
abnormal line [X] in the storage unit 8 (step S68), and then the speaker line [m] ] Is separated
from the amplifier 3 (step S70). On the other hand, when the abnormality of the impedance ZS
09-05-2019
20
can not be confirmed in the step S66 (in the case of NO), the CPU 5 passes the step S66 and
proceeds to the step S70. Then, the CPU 5 repeats the steps S64 to S70 in the order of the line
numbers [m] for all the remaining speaker lines 1, 1,... (Steps S72 and S74). When the processing
from step S64 to step 70 is completed for all the speaker lines 1, 1,..., The CPU 5 proceeds to step
S44 and ends the series of individual line processing.
[0070]
In this way, even when the plurality of speaker lines 1, 1,... Are short-circuited, each abnormal
line [X] can be identified with certainty. Of course, when the abnormal line [X] is only one line,
the CPU 5 does not execute the line individual process (step S56), so as described above, the
abnormal line [X] It can be identified.
[0071]
While the CPU 5 is executing the procedure of FIG. 4 except for the line individual process (step
S56) (strictly, the CPU 5 enters the routine of FIG. 4 until it reaches step S46. During that time,
the overcurrent continues to flow in each circuit due to the short circuit of the speaker line 1.
However, the specific operation of the abnormal line [X] according to the procedure of FIG. 4 is
executed instantaneously (in other words, the time for CPU 5 to enter the routine of FIG. 4 and
exit this routine is extremely short) Therefore, the influence of the above-mentioned overcurrent
on each circuit including the speaker lines 1, 1,... And the amplifier 3 is nil.
[0072]
As described above, according to the present embodiment, even in the case where the plurality of
speaker lines 1, 1,... Are provided, each of the prior art shown in FIGS. Detecting a short circuit of
each speaker line 1, 1, ... without providing fuses 9, 9, ... and current sensors 10, 10, ... for each of
the speaker lines 1, 1, ... it can. Therefore, the configuration of each of the speaker lines 1, 1,...
Can be simplified and the cost can be reduced. This becomes remarkable as the number M of
speaker lines 1 increases.
[0073]
09-05-2019
21
Also, in general, there is known a technique of using a test signal to check a short circuit of a
speaker line, but in the present invention, a broadcast signal output from the amplifier 3 is a
signal for the above test. It is diverted as. Therefore, there is no need to provide special means for
generating a signal for inspection.
[0074]
Then, in this embodiment, in order to determine whether or not an abnormality such as a short
circuit has occurred in the speaker line 1 based on the impedance Z S of the speaker line 1,
basically, from the amplifier 3 to the speaker line 1 As long as the broadcast signal is inputted, it
is possible to determine the presence or absence of abnormality of the speaker line 1 regardless
of the level of the signal. Therefore, unlike the above-described conventional techniques that can
detect a short circuit accident only when a large current of overcurrent flows, even if the signal
level (current) of the broadcast signal is small, it is possible to detect an abnormality in the
speaker line 1.
[0075]
In the present embodiment, whether or not the speaker line 1 is short-circuited is determined
based on whether or not the impedance Zs is equal to or greater than the reference value Z0.
However, the impedance Zs is within a predetermined range. The presence or absence of
abnormality of the speaker line 1 may be determined depending on whether it is inside. In this
way, not only the short circuit of the speaker line 1 but also the disconnection can be detected.
[0076]
That is, when the speaker line 1 is disconnected, the impedance Zs becomes larger than when the
speaker line 1 (all the speaker lines 1, 1,...) Is normal. Therefore, for example, a range (upper limit
value and lower limit value) obtained by adding a slight margin to the impedance Zs when the
speaker line 1 is normal is set as the predetermined range. Thereby, when the impedance ZS
obtained by the equation 1 is within this predetermined range, the speaker line 1 can be
regarded as normal, and when the impedance ZS is outside the predetermined range, It can be
considered that the speaker line 1 is shorted or disconnected.
09-05-2019
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[0077]
Further, when the impedance Zs is out of the predetermined range, the abnormality of the
speaker line 1 is a short circuit depending on whether the impedance Zs is smaller than the lower
limit or larger than the upper limit of the range. It is possible to determine if it is or if it is
broken. That is, when the impedance Zs is smaller than the lower limit value of the above range,
the speaker line 1 is short circuited, and when larger than the upper limit value, it can be
determined that the speaker line 1 is disconnected.
[0078]
However, when a certain degree of accuracy is required to determine whether or not the
impedance ZS is within the predetermined range, the impedance ZS when the speaker line 1 is
normal is accurately determined. It is necessary to ask for In order to realize this, it is desirable to
actually measure the impedance Zs of the speaker line 1 in advance. However, in this case,
needless to say, it takes extra work of measuring the impedance ZS as compared to the case
where the reference value Z0 is determined based on the above equation 2 and the suck 3.
[0079]
The CPU 5 in the present embodiment corresponds to the determination means and control
means described in the claims. Of course, the control means can be configured not only by the
CPU 5 but also by, for example, a so-called pure hardware configuration.
[0080]
Then, the maximum amplitude E of the output voltage of the amplifier 3 and the rated output PA
in the equation 2 correspond to the first rated output condition described in the claims, and the
maximum output voltage of the amplifier 3 in the equation 3 The amplitude E and the control
power P1 correspond to the second rated output condition described in the claims. Note that the
reference value Z0 may be determined according to conditions other than these mathematical
expressions. Of course, as described above, the impedance Zs of the speaker line 1 may be
actually measured in advance, and the reference value Z0 may be obtained based on the data
09-05-2019
23
obtained by the measurement.
[0081]
Further, each relay switch circuit 4, 4,... In the present embodiment corresponds to the opening /
closing means described in the claims. Although this switching means may be configured by
means other than the relay switch circuits 4, 4,..., If the relay switch circuits 4, 4,. There is no
need to provide a dedicated one as the opening / closing means.
[0082]
The display unit 7 corresponds to the information output means described in the claims. In
addition, this information output means can be comprised not only by the display part 7, for
example, by means which outputs the information showing the said abnormal circuit [X] in the
auditory form, such as a voice.
[0083]
Further, in the present embodiment, the two-line speaker line 1 has been described as the
speaker line 1, but the present invention is not limited to this, and a generally known three-line
speaker line may be used. The present invention is also applicable to
[0084]
Further, although the CPU 5 is operated according to the procedure shown in FIG. 2 or 3 in order
to specify the abnormal line [X], the present invention is not limited to this.
That is, the CPU 5 may be operated according to a procedure other than the above-described FIG.
2 or FIG. 3 as long as the same operation and effect as those of the present embodiment can be
obtained. For example, in the procedure of FIG. 2 or FIG. 3 above, each speaker line 1, 1,... It is
also good. In addition, when the abnormal line [X] is specified, the information indicating the
abnormal line [X] is displayed on the display unit 7, but conversely, the information indicating
normal speaker lines 1, 1,. May be displayed, or information representing both of them may be
displayed.
09-05-2019
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[0085]
As described above, according to the present invention, even when a plurality of speaker lines are
provided, one current detection means and one voltage detection means common to the speaker
lines are used. It can be recognized whether or not an abnormality such as a short circuit has
occurred in each speaker line. Therefore, unlike the above-described prior art, it is not necessary
to provide fuses 9, 9, ..., current sensors 10, 10, etc. for each speaker line. Therefore, there is no
need to prepare a fuse replacement operation or a spare fuse, and the configuration of each
speaker line can be simplified and the cost can be reduced. This effect is more remarkable as the
number of speaker lines is larger.
[0086]
Further, in the present invention, in order to determine whether or not an abnormality such as a
short circuit has occurred on the speaker circuit based on the impedance value of the speaker
circuit, basically, the broadcast signal output means broadcasts to the speaker circuit. As long as
a signal is input, whether or not there is an abnormality in the speaker line can be accurately
determined regardless of the level of the signal. Therefore, unlike the above-mentioned prior art
which can detect a short circuit accident only when a large current called an overcurrent flows,
even if the signal level (current) of the broadcast signal is small, it is possible to detect an
abnormality in the speaker line.
[0087]
Brief description of the drawings
[0088]
1 is a block diagram showing a schematic configuration diagram of a broadcast device provided
with a speaker line abnormality detection device according to the present invention.
[0089]
2 is a block diagram in the case where a plurality of speaker lines are provided in FIG.
09-05-2019
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[0090]
3 is a flowchart showing the operation of the CPU in the same embodiment.
[0091]
4 is a flowchart for operating the CPU according to a procedure different from FIG.
[0092]
5 is a flowchart showing a part of FIG. 4 in detail.
[0093]
6 is a schematic configuration diagram showing an example of the prior art.
[0094]
7 shows a conventional example in the case where a plurality of speaker lines are provided in
FIG.
[0095]
8 is a schematic configuration diagram showing a conventional example different from FIGS. 6
and 7.
[0096]
Explanation of sign
[0097]
1 Speaker Line 2 Speaker 3 Amplifier 4 Relay Switch Circuit 5 CPU 11 Current Sensor 12 Voltage
Sensor
09-05-2019
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