JP3010357B1 - Inspection equipment for speaker line - Google Patents

Abstract

An object of the present invention is to check whether an abnormality such as disconnection has occurred in a speaker line. SOLUTION: During a normal broadcast, a switch circuit 32 is switched so that a speaker line 22 of system B is connected to a transformer 31 side. Thus, announcements and the like corresponding to the audio signals can be broadcast from the speakers 1, 1,... Of the speaker lines 21 and 22.
On the other hand, when testing the speaker lines 21 and 22, the switch 32 is switched so that the speaker line 22 of the system B is connected to the transformer 32. As a result, the speakers 1, 1, 1 of the system B function as detection means for detecting sound output from the speakers 1, 1, 1 of the system A, and the speaker lines 21, 22, based on the detection signals. It is determined whether or not an abnormality has occurred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus for inspecting a speaker line to which one or more speakers are connected for abnormality such as disconnection or short circuit, and more particularly, to an inspection apparatus for checking a plurality of speakers in one space. The present invention relates to an inspection apparatus suitable for inspecting a speaker line in a broadcasting facility having the above speaker.

[0002]

2. Description of the Related Art Broadcasting equipment having a plurality of speakers in one space as described above includes, for example, an in-car broadcasting equipment of a train. In an in-vehicle broadcasting facility of a train, a plurality of speakers are arranged at appropriate positions in a space called a vehicle, for example, at a ceiling or the like, with an appropriate interval therebetween. In such a broadcasting facility, conventionally, for example, the following inspection work has been performed to inspect whether or not an abnormality such as disconnection or short circuit has occurred in a speaker line connecting each speaker and a sound source device such as an amplifier. Has been implemented. First, some broadcast sound is continuously output from a sound source device provided with a performance device such as a cassette player. In this state, the inspector goes to each vehicle and confirms whether or not the broadcast sound is normally output from each speaker by actually listening to the inspector's own ears.
Thereby, it is determined whether or not the speaker line including each speaker is normal.

[0003]

However, as described above, it is very difficult for an inspector to go to each vehicle to check whether the speaker line is normal or not. It is troublesome work and takes a long time. This problem becomes more pronounced as the number of vehicles forming the train increases. Of course, the same problem may occur not only in the in-vehicle broadcasting facilities of trains but also in the in-building broadcasting facilities of buildings.

Accordingly, an object of the present invention is to provide an inspection apparatus capable of inspecting whether or not a speaker line is normal without actually visiting a place where each speaker is installed.

[0005]

To achieve the above object, according to the present invention, a first speaker line to which one or more speakers are connected, and the first speaker line is an A test signal supply unit that supplies an AC test signal, for example, an audio signal, which can be converted to the first speaker line, and a sound output from the speaker when the test signal is supplied. Detecting means for generating a detection signal corresponding to the level of the sound obtained by the detection, and determining means for receiving the detection signal and determining whether or not the first speaker line is normal based on the detection signal And wherein the detecting means comprises the first switch.
Connected to a second speaker line separate from the speaker line
Speaker connected to the first speaker line
Where the sound output from the loudspeaker reaches
And connected to the first speaker line.
Converts the sound output from the speaker into electrical signals
The second speaker is constituted by a possible speaker.
Above obtained by converting with the speaker connected to
An electric signal is input to the determination means as the detection signal.
It is configured in a state where

[0006] Note that the term detection means, dynamic known to General <br/> For example (electrokinetic) type speaker or magnetic (electromagnetic) type speaker, or a capacitor (electrostatic) type speaker And the like, which can be converted into an acoustic-electric signal with a diaphragm .

In the first aspect of the present invention, for example, it is assumed that the first speaker line is normal (that is, no abnormality such as disconnection or short circuit has occurred). in this case,
A sound corresponding to the inspection signal is output from a speaker connected to the first speaker line, and the detection unit generates a detection signal corresponding to the sound level and inputs the detection signal to the determination unit. Based on the detection signal input thereto, the determination means determines that the signal level of the detection signal is, for example, a predetermined level (sound is normally output from the speaker, and that the detection means has normally detected the sound. After confirming that the first speaker line is normal, the first speaker line is determined to be normal and, for example, determination data indicating that fact is output.

On the other hand, when an abnormality such as disconnection or short circuit occurs in the first speaker line, sound is not normally output from the speaker, and for example, the output of the speaker becomes substantially zero. In this case, the signal level of the detection signal generated by the detection means also becomes substantially zero. Therefore, based on the signal level of the detection signal, the determination means determines that the first speaker line has an abnormality such as disconnection or short circuit, and outputs determination data indicating that.

Further, according to the first aspect of the present invention,
Only when both the first and second speaker lines are normal, an electric signal (detection signal) of a certain signal level is output from the speaker connected to the second speaker line, Based on the signal level, it is determined that both the first and second speaker lines are normal.
On the other hand, if at least one of the first and second speaker lines has an abnormality such as disconnection or short circuit, the signal of the detection signal obtained from the speaker connected to the second speaker line The level becomes almost zero. In this case, the determination means determines that an abnormality has occurred in at least one of the speaker lines.

That is, in the first aspect of the present invention , a speaker capable of converting an acoustic signal into an electric signal is used as the detecting means . Then, a second speaker line having a speaker that serves as the detecting means, check whether the first speaker line, abnormality in the entire loudspeaker line combined does not occur. When this test is not performed, a broadcast signal such as an announcement or BGM is supplied to each of the first and second speaker lines, so that these speaker lines are used as normal broadcast signals. it can.

According to a second aspect of the present invention, in the inspection apparatus according to the first aspect of the present invention, the inspection apparatus includes the inspection signal supply means and generates a signal for broadcasting other than the inspection signal, for example, an announcement or BGM. And a first state in which the first and second speaker lines are connected to the signal output side of the sound source means, and the first speaker line is connected to the signal output side of the sound source means. And a second state in which the second speaker line is connected to the signal input side of the discriminating means. When in the second state, the determination means determines whether or not the first speaker line is normal based on an electric signal input from the second speaker line via the switching means. Size Those that are configured in a state of.

According to the second aspect of the present invention, by setting the switching means to the first state, the first and second speaker lines can be used for ordinary broadcasting. That is, a broadcast sound such as an announcement or BGM can be played from each speaker connected to each speaker line. On the other hand, if the switching means is switched to the second state, the inspection of each speaker line can be realized as in the first aspect of the invention.

According to a third aspect of the present invention, in the inspection apparatus of the first aspect, there are a plurality of the speakers, and each of the speakers is connected in series to the speaker line to which each of the speakers is connected. It was done.

In general, it is known that most of the abnormalities of the speaker line including the speaker are caused by disconnection of the speaker itself (for example, disconnection of a movable coil inside the speaker in the case of a dynamic speaker) or disconnection of the speaker line itself. Have been.

For example, suppose that each speaker is connected in parallel to the first speaker line. Here, it is assumed that a disconnection has occurred in the first speaker line itself at a position closest to the inspection signal supply unit side of the first speaker line. In this case, no sound is output from all of the speakers connected to the first speaker line, so that the determination means uses the detection signal obtained from this detection means (that is, the signal level of the detection signal is substantially zero). Therefore, it can be easily determined that the first speaker line is disconnected.

However, if the first speaker line is disconnected in the middle, or if any of the speakers connected to the first speaker line (the speaker itself) is disconnected, the discriminating means determines that the disconnection has occurred. May not be accurately determined. In other words, if the first speaker line is broken in the middle, the speaker connected to the front end side of the first speaker line (that is, the side opposite to the side to which the inspection signal supply unit is connected) from the broken part. Although sound is no longer output from the speaker, sound is output from a speaker connected to the inspection signal supply unit with respect to the disconnection point. If the speaker itself breaks,
Although no sound is output from the disconnected speaker, sound is output from another normal speaker. As described above, when sound is output from at least some of the speakers, the signal level of the detection signal obtained from the detection unit does not become zero level. Therefore, the determination means is based on the signal level of the detection signal which can be said to be halfway of this kind,
Since it is determined whether or not the first speaker line is normal, the accuracy is lacking.

On the other hand, according to the third aspect of the present invention, since each speaker is connected in series to the first speaker line, when the speaker itself or the first speaker line is disconnected, Means that no sound is output from all speakers regardless of where the disconnection is. Therefore, the determination means can reliably determine whether or not the first speaker line including the speaker is disconnected.

Since the detecting means is constituted by the second speaker line (specifically, each speaker connected to the second speaker line), it is the same as above. That is, if each speaker is connected in parallel to the second speaker line, it is not possible to accurately determine whether or not the entire speaker line including the second speaker line is disconnected. However, if the speakers are connected in series, the output of the second speaker line becomes substantially zero irrespective of the location of the disconnection, so that the presence or absence of the disconnection can be reliably determined.

According to a fourth aspect of the present invention, in the inspection apparatus of the first aspect, there are a plurality of spaces in which the first speaker line and the detecting means are provided, and the first speaker line and the detecting means are arranged in each of these spaces. Each of the detection signals generated by each of the detection means is inputted, and first selection means for arbitrarily selecting and outputting any one of these detection signals is provided.
The detection signal output from the selection means is input to the determination means.

The above-mentioned plurality of spaces refer to, for example, the inside of each vehicle in the in-vehicle broadcasting equipment of a train, the each room in the in-building broadcasting equipment of a building, and the like.

According to the fourth aspect of the present invention, the first speaker line and the detecting means are provided in a plurality of spaces, respectively. Here, in order to inspect the first speaker line provided in an arbitrary (desired) space,
The detection signal output from the detection means provided in the arbitrary space is selected by the first selection means. Then, the judging means judges whether an abnormality has occurred in the first speaker line provided in the arbitrary space based on the selected detection signal. Note that each detection
The means are each constituted by a second speaker line.
Therefore , whether or not the entire speaker line including the first and second speaker lines is normal can be selectively inspected for each of the speakers provided in each space.

According to a fifth aspect of the present invention, in the inspection apparatus according to the fourth aspect , the first selecting means converts each detection signal inputted from each of the detecting means in accordance with a predetermined order. It is configured to select and output one by one sequentially.

According to the fifth aspect of the present invention, the first selecting means automatically detects each detection signal output from each detecting means provided in each space one by one in a predetermined order. To choose. Then, based on the detection signals obtained by sequentially selecting the speaker signals, the determination means includes a speaker speaker comprising first and second speaker lines provided in each space.
It is sequentially determined whether or not an abnormality has occurred in the entire battery.

According to a sixth aspect of the present invention, in the inspection apparatus according to the fourth aspect , the first selecting means is provided for each of the spaces, and the detecting means is provided for each of the spaces. Means for receiving the detection signals from the means, and outputting the detection signals in accordance with a first control command supplied through a common first control line. Generating the first control command for individually controlling each of the first individual control means in a state where the detection signal is output from any one of the first individual control means; The first main control means input to the control line and the detection signals respectively output from the first individual control means are received via a detection signal line common to the first individual control means. The first recipient to do When it made, in which the detection signal obtained by receiving the first receiving means, configured in a state of input to the determination means as the output of said first selection means.

According to the invention described in claim 6, the first individual control means provided to each space is connected to a common first control line and the detection signal lines, respectively I have. Here, in order to inspect a speaker line provided in an arbitrary space, the first main control means generates a first control command to that effect and inputs this to the first control line. . Then, in response to the first control command, the first individual control means provided in the arbitrary space sends a detection signal obtained from the detection means provided in the arbitrary space to an inspection signal line. Through
Transmit to the first receiving means. The first receiving means inputs the received test signal to the discriminating means, and based on the test signal, the discriminating means determines whether or not the speaker line provided in the arbitrary space is normal. Is determined.

[0026] That is, the invention described in claim 6, by the respective spaces common first control line and the inspection signal line, a network connecting the first individual control means provided respectively in each of the spaces It was done. And
The first main control means centrally controls each of the first individual control means via a first control line (specifically, generates first control data for realizing this control). Each test signal obtained from each detecting means under control is transmitted to a common discriminating means via the test signal line.

According to a seventh aspect of the present invention, in the inspection apparatus of the first aspect, there is provided a plurality of spaces in which the first speaker line, the detection means, and the discrimination means are arranged. Second selection means for receiving, for example, digital discrimination data representing the results of the discrimination by the discrimination means arranged in each of these spaces, and arbitrarily selecting and outputting any one of the discrimination data. Is provided.

The above-mentioned plurality of spaces refer to, for example, the inside of each vehicle in the in-vehicle broadcasting equipment of a train, the each room in the in-building broadcasting equipment of a building, and the like.

According to the seventh aspect of the present invention, the first speaker line, the detecting means, and the determining means are provided in a plurality of spaces, respectively. Here, in order to perform the inspection of the first speaker line provided in an arbitrary space, the second selection unit selects the judgment data output from the judgment unit arranged in the arbitrary space. I do. As a result, the discrimination data obtained by the selection is stored in the second
Is output from the selection means of
It is possible to recognize whether or not an abnormality has occurred in the first speaker line. Since each of the detecting means is constituted by the second speaker line, it is provided in each space whether or not the entire speaker line including the first and second speaker lines is normal. Inspection can be selectively performed for each object.

[0030] That is, the invention described in claim 7, the determining means for each space is provided, those desired from each discrimination data obtained to determine, respectively, by respective discriminating means, a second selection of It is selected by means. This point
This is different from the invention according to claim 5 in which one discriminating means is shared in each space, and a detection signal to be discriminated by this discriminating means is selected by the first selecting means.

According to an eighth aspect of the present invention, in the inspection apparatus according to the seventh aspect , the second selecting means automatically selects the discrimination data one by one in a predetermined order. It is configured to output data.

According to the eighth aspect of the present invention, the second selecting means automatically sorts each of the discrimination data output from each of the discriminating means provided in each space one by one in a predetermined order. Selectively output. Therefore, from these discrimination data sequentially output, the
Speaker line composed of first and second speaker lines
It is possible to sequentially recognize whether or not any abnormality has occurred.

According to a ninth aspect of the present invention, in the inspection apparatus of the seventh aspect , the second selecting means is provided for each of the spaces, and the discrimination is provided for each of the spaces. Means for inputting the discrimination data, and outputting the discrimination data in accordance with a second control command supplied through a common second control line. The second control command for individually controlling each of the second individual control means is generated in a state in which the discrimination data is output from any one of the second individual control means. The second main control means input to the control line and the respective discrimination data output from the second individual control means, respectively,
A second receiving means for receiving the data through a discrimination data line common to the second individual control means.
The discrimination data received by the receiving means of
Output of the selecting means.

According to the ninth aspect of the present invention, each second individual control means provided in each space is connected to a common second control line and a common discrimination data line. I have. Here, in order to inspect a speaker line provided in an arbitrary space, the second main control means generates a second control command indicating that, and inputs the second control command to the second control line. . Then, in response to the second control command, the second individual control means provided in the arbitrary space determines the determination data representing the determination result by the determination means provided in the arbitrary space. The data is transmitted to the second receiving means via the data line. Therefore, it is possible to recognize from the discrimination data received by the second receiving means whether or not the speaker line provided in the arbitrary space is normal.

That is, according to the ninth aspect of the present invention, each second individual control means provided in each space is connected to the network by the second control line and the discrimination data line common to each space. It was done. Then, the second main control means centrally controls each second individual control means via the second control line (specifically, generates second control data for realizing this control).
At the same time, each discrimination data output from each discrimination means in response to this control is transmitted to the second receiving means side via the discrimination data line.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the inspection apparatus according to the present invention is applied to, for example, an in-vehicle broadcasting facility of a train will be described with reference to FIGS.

FIG. 2A shows an overall schematic configuration of the present embodiment. As shown in the figure, the train according to the present embodiment is an N-car train, and each car has a speaker line 2 to which a plurality of speakers 1, 1,. A power amplifier 3 to which the line 2 is connected is provided. A control amplifier 4 is provided in each of the first vehicle (the first car) and the last vehicle (the Nth car), and these control amplifiers 4, 4 and the power amplifiers 3, 3,.
Are connected via a common transmission line 5 respectively. As will be described later, the transmission line 5 includes three sets of lines: an acoustic signal line 51, a control data line 52, and a determination data line 53.

FIG. 1A shows a schematic configuration of a power amplifier 3 including the speaker line 2 provided for each vehicle. As shown in the figure, the speaker line 2 has two sets of lines 21 and 22 of systems A and B. Each of the lines 21 and 22 has, for example, three dynamic speakers 1 each. They are connected in series.

FIG. 1B shows each of the speakers 1, 1,.
FIG. As shown in FIG. 1, the speakers 1, 1,... Are arranged such that the system A and the system B are alternately located along the traveling direction of the train (the longitudinal direction of the vehicle). Are arranged substantially in a row at predetermined intervals, for example, on the ceiling of the vehicle. Here, the predetermined interval means, for example, that the sound output from one of the speakers 1, 1, 1 of each of the systems A and B is the sound of the other speaker 1, 1, 1 adjacent to the other. Refers to a distance enough to reach the installation location.

The speaker line 21 of the system A is
It is connected to a secondary side 31a of a transformer 31 in the power amplifier 3. In addition, the primary side 31b of this transformer 31
A so-called audio signal in the audible frequency band supplied from the control amplifier 4 of the first car or the Nth car to the power amplifier 3 via the sound signal line 51 of the transmission line 5 is amplified by the amplifier 33. Thereafter, the signal is input via the DC cut capacitor 34.

On the other hand, the line 22 of the system B is connected to a changeover switch circuit 32 in the power amplifier 3. The changeover switch circuit 32 is connected to the speaker line 22 (strictly speaking, both ends of the line 22) of the system B and the secondary side of the transformer 31 in accordance with a switching signal given from, for example, a control unit 35 having a CPU (central processing unit). 31a (strictly speaking, both ends of the winding of the secondary side 31a) and a primary side 36a of a transformer 36 different from the transformer 31.
(Strictly speaking, both ends of the winding of the primary side 36a) and the second state of connecting the speaker line 22 of the system B (strictly, both ends of the line 22). The control unit 35 generates the switching signal according to control data supplied from the control amplifier 4 via the control data line 52 of the transmission line 5. The secondary side 36b of the transformer 36 is connected to an input side of a discrimination circuit 38 described later via an amplifier 37 different from the amplifier 33.

The speaker line 2 configured as described above
In the power amplifier 3 including, for example, the changeover switch circuit 32 is in a first state, that is, a state in which the speaker line 22 of the system B is connected to the secondary side 31a of the transformer 31. . In this state, when a broadcast signal such as an announcement is input as the acoustic signal to the input side of the amplifier 33, the announcements and the like are broadcast from the speakers 1, 1,. That is, ordinary in-vehicle broadcasting is realized.

On the contrary, the changeover switch circuit 32
When in the second state, that is, when the speaker line 22 of the system B is connected to the primary side 36a of the transformer 36, the speakers 1, 1, 1 of the system B are connected to the electric signal-acoustic converter. It does not fulfill its original function, but functions as an acoustic-electric signal converter that converts external sound into an electric signal (so-called inverse conversion). Therefore, in this state, when, for example, a signal having a certain frequency is input as the acoustic signal to the input side of the amplifier 33, each speaker 1 of the system A,
A sound corresponding to the signal is output from the speakers 1, 1, and the sound is converted into an electric signal by the speakers 1, 1, 1 of the system B, that is, detected. A so-called detection signal obtained by detection by each speaker 1, 1, 1 of the system B is
The signal is input to the determination circuit 38 via the changeover switch circuit 32, the transformer 36, and the amplifier 37.

The discriminating circuit 38 has, for example, a comparator (comparison) circuit configuration. The discriminating circuit 38 compares the signal level of the detection signal inputted thereto with a predetermined reference level to determine whether the signal level of the inspection signal is at the reference level. When the test signal is higher than the reference level, a high (H) level signal is output, and when the signal level of the test signal is lower than the reference level, a low (L) level signal is output. For example, when no abnormality such as disconnection or short circuit occurs in each of the speaker lines 21 and 22, and each of the lines 21 and 22 is normal, the signal level of the detection signal becomes a certain level. On the other hand, speaker line 2 of system A
In the case where the above-mentioned abnormality occurs, no sound is output from each of the speakers 1, 1, 1 of the system A, so that the signal level of the above-mentioned detection signal is at most about the level of the background noise outside (in the vehicle). It becomes weak. When an abnormality occurs in the speaker line 22 of the system B, the signal level of the detection signal becomes substantially zero. Therefore, if the reference level is set to a substantially intermediate level between the signal level of the detection signal when both the speaker lines 21 and 22 are normal and the signal level of the detection signal when at least one of them is abnormal, Depending on whether the output of the determination circuit 38 is at H level or L level, each speaker line 21
It can be determined whether or not 22 is normal, that is, the inspection of the speaker line 2 can be realized.

It should be noted that the 2 output from the determination circuit 38
The digitized signal, so-called discrimination data, is transmitted to the control amplifier 4 via the discrimination data line 53 of the transmission line 5 described above.

FIG. 3 shows a schematic configuration of the control amplifier 4. As shown in FIG.
Are the power amplifiers 3 provided for each vehicle,
, And a control unit 41 for transmitting and receiving the control data and the discrimination data to and from each of the power amplifiers 3, 3,.
And a sound source section 42 for generating the above-described acoustic signal to be supplied to the. The control unit 41 has, for example, a CPU configuration. The control unit 41 includes an operation unit 43 for giving various instructions to the control unit 41, and a display unit for displaying various information in accordance with control by the control unit 41. 44,
Each is connected. The sound source unit 42 outputs the microphone 42a and the sound reproducing device 42b, which are sources of the above-described announcements, and the above-described signal of a certain frequency, that is, a so-called inspection signal used when inspecting the speaker line 2. Various sound sources such as a test signal generation device 42c to be generated are provided. These sound sources 42a to 42a
The control unit 41 controls which of the outputs c is valid.

In the control amplifier 4 thus configured, the control unit 41 operates, for example, as follows. That is, when performing a normal broadcast such as playing an announcement, a command to that effect is input from the operation unit 43. Then, the control unit 41 controls all the vehicles (the power amplifiers 3, 3,...).
..), the respective changeover switch circuits 32 are set to the first state (that is, the secondary side 31a of the transformer 31).
And the speaker line 22 of the system B are connected). At the same time, the control unit 41
Controls the sound source unit 42 so that the output of the microphone 42a or the sound reproducing device 42b is made valid. Thereby, the microphone 42a or the sound reproducing device 42b
Announcements by the speakers 1, 1,.
・ ・ We can broadcast from.

On the other hand, each speaker line 2 in each vehicle,
When an inspection is performed to determine whether or not 2,... Are normal, a command to that effect is input through the operation unit 43. Then, the control unit 41 controls the sound source unit 42 to make the output of the test signal generation device 42c valid. At the same time, the control unit 41, based on a generally known polling selection method, for example, as shown in FIG.
A command to sequentially execute the inspection of the speaker line 2 from the first car, that is, the changeover switch circuit 32 is switched to the second state (that is, the primary side 36a of the transformer 36 and the speaker line 22 of the system B).
Is transmitted, the control data is transmitted. As a result, an inspection is performed as to whether or not the speaker line 2 is normal from the first car, and discrimination data representing the inspection result is sent back to the control unit 41 side from the first car. . After receiving the discrimination data from all the vehicles, the control unit 41 displays the inspection result of each speaker line 2, 2,... On the display unit 44 based on each of the discrimination data obtained and received. I do.

The control amplifier 4 is provided in each of the first car and the Nth car. When the above control is performed, one of the control amplifiers 4 is used.
Is given priority. Also, which of the priorities is given can be arbitrarily set by a predetermined procedure.

Each of the speaker lines 2, 2,.
・ ・ Control to realize inspection
The control unit 41 on the amplifier 4 side follows the procedure shown in FIG.
Each control unit 35 of each power amplifier 3 operates according to the procedure shown in FIG. Note that programs for operating the control units 41 and 35 in accordance with the procedures shown in the drawings are stored in storage units (not shown) in the amplifiers 4 and 3, respectively.

As shown in FIG. 4, when the control section 41 of the control amplifier 4 is instructed by the operation section 43 to perform an inspection of the speaker lines 2, 2,... Of each vehicle. First, an initial setting is performed (step S
2). In this initial setting, the control unit 41 sets n = 1 as an index (a so-called control data transmission destination address) n indicating the number of the vehicle to be inspected.

After the initial setting, the control section 41 issues an inspection command to carry out an inspection of the speaker line 2 for the n-th car, ie, n = 1 car at first (ie, the changeover switch circuit of the first car). 32 is transmitted (control data for setting 32 in the second state) (step S4).

On the other hand, as shown in FIG. 5, the control unit 35 on the power amplifier 3 side of each vehicle has the changeover switch circuit 32 in the first state. Control data) (step S20). Then, when the self-addressed inspection command is received (YES in step S20), the changeover switch circuit 32 is switched to the second state in response to this (step S22). As a result, the speaker line 2 is inspected, and discrimination data representing the test result is output from the discrimination circuit 38. Control unit 35
Is the changeover switch circuit 32 in step S22.
For a predetermined time (for example, a time sufficient for the determination circuit 38 to generate and output the determination data) for the second time T
After switching to the state, the state is returned to the first state, and the processing returns to the step S20 (step S24).

The control section 41 on the control amplifier 4 side
After transmitting the inspection command in step S4,
It is in a state of waiting for the discrimination data to be sent from the destination vehicle (step S6). Here, when the determination data is received (YES in step S6), the control unit 41 temporarily stores the received determination data in the storage unit (not shown) (step S8).
Then, the operation from step S4 to step S8 of receiving and temporarily storing the determination data is repeated for all vehicles (steps S10 and S12).

When the determination data of all the vehicles is received and temporarily stored (YES in step S10), the control unit 41 determines each speaker line 2 of each vehicle based on the temporarily stored determination data. .. Are displayed on the display unit 44 (step S14). In addition,
The inspection result is not limited to the display, and the above-described inspection result may be output, for example, by voice or printed matter (ie, print paper). And
According to the output of this inspection result, each speaker line 2, 2,.
Is completed.

As described above, according to the present embodiment, the control amplifier 4 installed in the first car or the Nth car
It is possible to recognize whether or not each of the speaker lines 2, 2,... Of each vehicle is normal based on the inspection result displayed on the (display unit 44). Therefore, unlike the above-described prior art, the inspector does not need to bother to each vehicle, so that the working time can be shortened and the working efficiency can be improved. This becomes remarkable as the number of trains of the vehicle increases.

The speaker line 2 is connected to the systems A and B.
The speakers 1, 1, 1 of one of the lines 22 are assigned to the lines 21, 22 of the set, and the other
Functioning as detecting means for detecting the sound output from the speakers 1, 1, 1
2 (speaker line 2). Therefore, since it is not necessary to provide a dedicated detection means such as a microphone, the cost of the apparatus can be reduced accordingly.
The speaker line 22 functioning as the detection means
It has the effect of two birds with one stone, as it can also perform its own inspection.

Further, in the present embodiment, the speakers 1, 1,...
Since each is connected in series, each speaker line 2
It is possible to reliably recognize the disconnections of the speakers 1, 22 and the speakers 1, 1,... This will be described with reference to FIG.

That is, it is assumed that the speakers 1, 1, 1 are connected in parallel to the speaker line 21 of the system A as shown in FIG. Here, for example, the point P
As shown by, when the root of the speaker line 21 is disconnected, no sound is output from each of the speakers 1, 1, 1 even if an audio signal is supplied to the speaker line 21.
Therefore, the signal level of the detection signal output from the speaker line 22 of the system B is at most a weak level equivalent to the background noise in the vehicle, that is, the reference level or less. But,
As shown by a point Q in the figure, when the speaker line 21 is disconnected in the middle, sound is emitted from the speakers 1, 1 located on the root side (left side in the figure) of the speaker line 21 from the broken point Q. Is output. Further, as shown by a point R in the figure, when a certain speaker 1 itself (or a lead-in line to the speaker 1) is disconnected, sound is output from the other normal speakers 1, 1. Therefore, in these cases, the signal level of the detection signal does not become zero and may possibly become higher than the reference level. become unable.

This means that the speaker line 22 of the system B
The same applies to That is, when a disconnection occurs at the point P, the signal level of the detection signal output from the speaker line 22 becomes zero, but when a disconnection occurs at the point Q or the point R, the signal level of the detection signal becomes zero. In some cases, it may be higher than the reference level.

On the other hand, in the present embodiment, each of the speaker lines 21 and 22 or each of the
When the disconnection occurs in 1,... Itself, the signal level of the detection signal becomes substantially zero irrespective of where these disconnection points are. Therefore, as described above, these disconnections can be reliably recognized. This is because the abnormality of the speaker lines 21 and 22 is generally caused by the disconnection of the speaker lines 21 and 22 themselves.
.. Or a break in the speakers 1, 1,... (In the case of a dynamic speaker, a break in an internal movable coil) in many cases.

In this embodiment, the case where the present invention is applied to the in-vehicle broadcasting equipment of a train has been described. However, the present invention is not limited to this. For example, other in-building broadcasting equipment in a building or broadcasting equipment in a station premises. The present invention can be applied to broadcasting equipment.

Further, although each of the speakers 1, 1,... Is of a dynamic type, it is not limited to this. That is, as for the speakers 1, 1, and 1 of the system A, any speakers may be used as long as they satisfy the specifications of the broadcast facility to which the present invention is applied. Further, the speakers 1, 1, 1 of the system B may have a speaker configuration employing another conversion mechanism, such as a magnetic type or a capacitor type, as long as it can convert sound-electric signals.

Then, all speaker lines 2 of all vehicles,
In order to realize the inspection of 2,..., The control unit 41 on the control amplifier 4 side and the control unit 35 on the power amplifier 3 side of each vehicle are operated in accordance with the flowcharts of FIGS. However, it is not limited to this. That is, if the same operation and effect as in the present embodiment can be obtained,
The control units 41 and 35 may be operated according to another procedure. Further, each of these control units 41 and 35 is not limited to the CPU configuration, but can also be realized by a hardware configuration such as a logic circuit.

Further, the control amplifier 4 and each of the power amplifiers 3, 3,... Are connected by a common transmission line 5. For example, as shown in FIG. Vehicle (power amplifiers 3, 3, ...)
Each time, one (set) may be provided.

Then, in the power amplifier 3 of each vehicle,
Although the discrimination circuit 38 is provided, the discrimination circuit 38 may be provided on the control amplifier 4 side, or the function of the discrimination circuit 38 may be provided in the control unit 41 on the control amplifier 4 side. With this configuration, the number of the configuration of the determination circuit 38 or the determination circuit 38 itself can be reduced, and the cost can be reduced accordingly. In this case, the control unit 41 on the control amplifier 4 side corresponds to the first main control unit and the first reception unit described in the claims, and the control unit 35 on each power amplifier 3 side is This corresponds to one individual control means. And
Each power from the control unit 41 on the control amplifier 4 side
The control data sent to the control unit 35 of the amplifier 3 corresponds to the first control command described in the claims, and the control data line 52 through which the control data is transmitted corresponds to the first control line. I do. A line for transmitting a detection signal (for example, an output signal of the amplifier 37) sent from each power amplifier 3 to the control amplifier 4 according to the control data corresponds to the detection signal line described in the claims. I do.

However, in the present embodiment, the control section 41 of the control amplifier 4 corresponds to the second main control means and the second reception means described in the claims.
The control unit 35 on each power amplifier 3 side corresponds to a second individual control unit. The control data corresponds to a second control command described in the claims, and the control data line 52 corresponds to a second control line described in the claims. As in the present embodiment, a discriminating circuit 38 is provided for each vehicle, the discriminating circuit 38 converts the test result of the speaker line 2 into discriminating data, and controls the digital discriminating data obtained by this conversion. Transmission to the amplifier 4 improves the noise resistance of data (signal) in the transmission process.

The test signal generator 42c in the control amplifier 4 corresponds to the test signal supply means described in the claims, and the tone generator 42 including the test signal generator 42c is described in the claims. Corresponds to the sound source means described in (1). The speaker line 21 of the system A corresponds to a first speaker line described in the claims, and the speaker line 22 of the system B corresponds to a second speaker line described in the claims. Further, the changeover switch circuit 32 corresponds to the switching means described in the claims,
The first and second states of the changeover switch circuit 32 correspond to the first and second states described in the claims, respectively.

[0069]

As described above, according to the inspection apparatus of the first aspect of the present invention, whether or not sound is output from each speaker is detected by supplying an inspection signal to the speaker line. Then, based on the detection result, the determination means determines whether or not an abnormality such as disconnection or short circuit has occurred in the speaker line. Therefore, unlike the above-described prior art, the inspector does not need to bother to the installation location of each speaker, so that the working time can be shortened and the working efficiency can be improved. This effect becomes more pronounced as the number of speakers increases.

[0070] In the invention described in claim 1, as a speaker line broadcasting equipment, the first and the second speaker line provided, of which you apply the second speaker line as the detection means . Therefore, there is no need to provide a dedicated detecting means such as a microphone, for example, in addition to these speaker lines, and the cost of the inspection apparatus can be reduced accordingly.

[0071] inspection apparatus of the present invention according to claim 2, wherein
Item 1. The inspection apparatus according to Item 1 , wherein a first state in which both the first and second speaker lines are connected to an output side of the sound source means, and a first speaker line is connected to the output side of the sound source means. And a switching means for arbitrarily switching to one of a second state in which the second speaker line is connected and a second speaker line is connected to the input side of the determination means. Therefore, if the broadcasting equipment is in the normal broadcasting state,
Alternatively, it is possible to easily switch between a state in which the inspection of the speaker line is performed.

In the inspection apparatus according to the third aspect of the present invention, a speaker is connected in series to a speaker line. Therefore, unlike a speaker line connected in parallel to a speaker line, for example, there is an effect that the speaker itself and the disconnection of the speaker line itself can be recognized.

According to the inspection apparatus of the fourth aspect of the present invention, the inspection of each speaker line can be selectively performed in a broadcasting facility provided with individual speaker lines for each of a plurality of spaces. Therefore, it is very effective as a speaker line inspection device in, for example, in-train broadcasting equipment of a train or in-building broadcasting equipment of a building. Further, since one discriminating means is shared in each space, the cost of the inspection apparatus can be reduced correspondingly.

According to the inspection apparatus of the fifth aspect of the invention, in the inspection apparatus of the fourth aspect of the invention, the inspection of each speaker line can be sequentially and automatically performed in a predetermined order. . Therefore, there is an effect that the efficiency of the inspection operation can be improved as compared with manually selecting the speaker line to be inspected.

[0075] According to the inspection apparatus of the invention described in claim 6, when to transmit each of the detection signals to the discrimination means from the detecting means provided in each space, common detection signal line them, respectively Via the Internet. Therefore, for example, each detecting means and discriminating means (first selecting means)
This is advantageous in that the transmission line connecting these two can be reduced in line compared to the case where they are connected by separate transmission lines. This effect becomes more conspicuous as the number of the spaces, for example, the number of trains in the on-board broadcasting facilities of the train, the number of rooms in the in-building broadcasting facilities of the building, and the like are larger.

[0076] According to the inspection apparatus of the invention described in claim 7, similar to the inspection apparatus of the invention described in claim 4, in the broadcasting facilities respectively provided a separate loudspeaker lines for each of a plurality of spaces, the speaker Inspection of the line can be selectively performed. Further, the second selecting means for making this selection targets digital discrimination data input from each discriminating means provided for each space, respectively. Therefore, the information corresponding to the discrimination data (that is, representing the discrimination result) is, for example, an analog signal, and the analog signal is transmitted from each space (each discrimination means) to the second selection means. There is an effect that noise resistance of the information in the transmission process can be improved. This effect becomes more remarkable as the transmission line connecting each space and the second selecting means becomes longer.

According to the inspection apparatus of the invention described in claim 8 , in the inspection apparatus of the invention described in claim 7 , the inspection of each speaker line can be sequentially and automatically performed in a predetermined order. . Therefore, there is an effect that the efficiency of the inspection operation can be improved as compared with manually selecting the speaker line to be inspected.

According to the inspection apparatus of the ninth aspect , when each discriminating data is transmitted from each discriminating means provided in each space to one place (second receiving means), these are discriminated. Each is transmitted via a common discrimination data line. Therefore, for example, each discriminating means and the second
As compared with the case where the receiving means is connected by separate transmission lines, there is an effect that the transmission line connecting these two can be reduced in line. This effect becomes more conspicuous as the number of the spaces, for example, the number of trains in the on-board broadcasting facilities of the train, the number of rooms in the in-building broadcasting facilities of the building, and the like are larger.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment in which an inspection device according to the present invention is applied to an in-vehicle broadcast facility of a train, where (a) is a block diagram schematically illustrating a relevant portion of each vehicle, and (b). )
FIG. 3 is a diagram conceptually showing the arrangement and connection state of each speaker in each vehicle.

FIG. 2 is a diagram showing an overall configuration of the embodiment;
Is a block diagram thereof, and (b) is a command sequence showing a schematic protocol of data communication performed between the control amplifier and each power amplifier.

FIG. 3 is a schematic block diagram of a control amplifier.

FIG. 4 is a flowchart illustrating an operation of a control unit on the control amplifier side.

FIG. 5 is a flowchart illustrating an operation of a control unit on the power amplifier side.

FIG. 6 is an explanatory diagram of a case where speakers are connected in parallel.

FIG. 7 is an overall configuration diagram illustrating another example of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker 2 Speaker line 3 Power amplifier 5 Transmission line 38 Discrimination circuit

Claims (9)

(57) [Claims] A first speaker line to which one or more speakers are connected; an inspection signal supply means for supplying an AC inspection signal which can be converted to sound by the speakers to the first speaker line; Detecting means for detecting sound output from the speaker when the test signal is supplied, and generating a detection signal corresponding to the level of the sound obtained by the detection; Determining means for determining whether or not the first speaker line is normal, wherein the detecting means is connected to a second speaker line different from the first speaker line. And a speaker connected to the first speaker line and arranged at a position where sound output from a speaker connected to the first speaker line reaches. A speaker that can convert sound output from the speaker into an electric signal; and input the electric signal obtained by converting the sound output from the speaker connected to the second speaker line to the discriminating means as the detection signal. An inspection device for a speaker line, which is configured to be in a state of being turned on. 2. A sound source means including the test signal supply means for generating and outputting a broadcast signal other than the test signal, and outputting the first and second speaker lines to a signal output from the sound source means. And a second state in which the first speaker line is connected to the signal output side of the sound source means and the second speaker line is connected to the signal input side of the discriminating means. And a switching means that can be arbitrarily switched to any one of the states, wherein when the switching means is in the second state, the discriminating means controls the second through the switching means. 2. The speaker line inspection apparatus according to claim 1, wherein the apparatus is configured to determine whether or not the first speaker line is normal based on an electric signal input from the speaker line. 3. The speaker line inspection apparatus according to claim 1, wherein there are a plurality of the speakers, and each of the speakers is connected in series to the speaker line to which each speaker is connected. 4. There are a plurality of spaces in which the first speaker lines and the detecting means are provided, and respective detection signals generated by the respective detecting means arranged in each of the spaces are inputted. 2. The apparatus according to claim 1, further comprising first selection means for arbitrarily selecting and outputting any one of the detection signals, and wherein the detection signal output from the first selection means is input to the determination means. The speaker line inspection device according to the above. 5. The apparatus according to claim 4, wherein said first selection means is configured to sequentially select and output each detection signal input from each of said detection means one by one in a predetermined order. Inspection system for speaker line. 6. The first selection means is provided for each of the spaces, and the detection signals are respectively inputted from the detection means provided in the respective spaces, and the detection signals are respectively provided to the respective spaces. A first individual control means for outputting according to a first control command supplied via a common first control line; and a state in which one of the first individual control means outputs the detection signal. First main control means for generating the first control command for individually controlling each of the first individual control means and inputting the first control command to the first control line; A first receiving means for receiving each of the detection signals output from the control means via a detection signal line common to the first individual control means, and receiving the detection signals by the first receiving means. Detection signal obtained The,
5. The speaker line inspection apparatus according to claim 4, wherein the apparatus is configured to be input to the determination means as an output of the first selection means. 7. A plurality of spaces in which said first speaker line, said detecting means, and said discriminating means are provided, and each discriminant representing each discrimination result by each discriminating means arranged in each of these spaces. 2. The speaker line inspection apparatus according to claim 1, further comprising a second selection unit to which data is input, and which arbitrarily selects and outputs any one of these discrimination data. 8. The apparatus according to claim 7, wherein said second selection means is configured to sequentially select and output each of the determination data input from each of said determination means one by one in a predetermined order. Inspection system for speaker line. 9. The second selecting means is provided for each of the spaces, and receives the discriminating data from the discriminating means provided in each space, and outputs the discriminating data to each of the spaces. Common second
A second individual control means for outputting in accordance with a second control command supplied via the control line, and a second individual control means for outputting the determination data from one of the second individual control means. The second main control means for generating the second control command for individually controlling the individual control means and inputting the same to the second control line; And second receiving means for receiving each of the discrimination data to be output via a discrimination data line common to each of the second individual control means, and receiving and obtaining the discrimination data by the second receiving means. 8. The speaker line inspection apparatus according to claim 7, wherein the determination data is output from the second selection unit.