JPH07239993A - Testing device for operation of speaker - Google Patents

Abstract

PURPOSE:To surely and accurately judge the operation of a speaker by easily measuring the impedance of the speaker. CONSTITUTION:A constant current signal Sa of a constant current in an audio range is sent out of a constant current output circuit 2 to the speaker as an object of an operation test and a BPF 3. Constant currents Sa (Sa1, Sa2, and Sa3) of level, varied on the basis of the impedance of the speaker, from the BPF 3 are set to a specific level through a variable amplification part 4 and a speaker impedance switching part 5, and further detected by an effective value measuring circuit 9 and converted into a DC level, which is compared by an abnormality detecting circuit 10 with a previously set threshold value. When the DC level exceeds the threshold value, the abnormality detecting circuit 10 displays abnormal operation such as a open circuit and a short circuit of the voice coil path of the speaker by the illumination or blinking, a figure or character screen display, or a sound or synthesized voice or their combination through a display circuit 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker operation test device for use in speaker warning broadcasting, a dam discharge warning system for issuing a siren warning, a disaster prevention radio system, etc., and for performing an operation test based on the impedance of the speaker. .

[0002]

2. Description of the Related Art Conventionally, in a dam discharge warning system, a disaster prevention radio system, etc., a plurality of trumpet speakers are installed at a place where a discharge or a disaster warning is given, and a warning broadcast and a siren alert are issued to nearby people. .

Such a dam discharge warning system has a control and monitoring station, a relay station, a siren warning station, and a speaker warning station which are connected by a wireless line. In this dam discharge warning system, based on the warning control information and relay control information transmitted from the control and monitoring station, the siren warning station,
The speaker warning station performs warning broadcasting and siren notification. In this case, the alarm response information is confirmed by the siren alarm station and the speaker alarm station itself, or radio waves are transmitted to the control and monitoring station through the relay station, and the operating state is identified by the control and monitoring station.

As an example of the alarm response information for the alarm control information, when the siren alarm processing device of the siren alarm station and the speaker alarm processing device of the speaker alarm station identify the operation of the speaker and there is an abnormality, for example, Three
In the speaker of the system, the bit information of the abnormality of the speaker 1, the abnormality of the speaker 2, and the abnormality of the speaker 3 is inserted into the information portion (for example, 64 bits) in the frame of the alarm response information and transmitted.

In this case, the siren alarm processing device of the siren alarm station and the speaker alarm processing device of the speaker alarm station are
When confirming the speaker operation individually, it is confirmed whether the audio signal level from the amplifier to the speaker is within a predetermined value, or the voice coil of the speaker is provided with a coupling coil, so-called triple winding. The signal detected by the inductive M coupling by the formula confirms the normal or abnormal operation.

[0006]

However, in the conventional speaker operation test apparatus as described above, when the audio signal level from the amplifier to the speaker is confirmed, the operation of the speaker cannot be directly confirmed. In addition, the triple winding method has a drawback that a special speaker needs to be manufactured, which increases the cost.

The present invention solves the problems in the prior art as described above. Based on the individual impedances of a plurality of speakers, normal or abnormal operation of the speakers can be reliably and accurately determined. It is an object of the present invention to provide a speaker operation test device capable of surely confirming this abnormal display.

[0008]

In order to achieve the above-mentioned object, a speaker operation test apparatus according to a first aspect of the present invention comprises a low frequency transmitting means for transmitting a low frequency signal to a speaker to be subjected to an operation test, and an impedance of the speaker. A low-frequency deriving means for outputting a low-frequency signal of a changed level based on the above, a converting means for converting the low-frequency signal from the low-frequency deriving means into a DC level, and a comparison for comparing the DC level with a preset threshold value. Means and an abnormality display means for displaying an abnormality of the speaker when the direct current level from the comparison means exceeds a threshold value.

A speaker operation test apparatus according to claim 2 is
The low-frequency transmitting means uses a constant-current output circuit that outputs a low-frequency signal of a constant current in the voice band to the speaker.

A speaker operation test apparatus according to claim 3 is
The low-frequency deriving means is configured to use a bandpass filter that is connected to the speaker and the low-frequency transmitting means and derives a low-frequency signal that changes with the impedance of the speaker.

A speaker operation test apparatus according to a fourth aspect is
The conversion means uses a detection circuit that outputs a direct current level signal obtained by detecting the low frequency signal from the low frequency derivation means.

A speaker operation test apparatus according to a fifth aspect is
The comparison means is configured to use a window comparator that compares the DC level from the conversion means with at least two thresholds having different levels.

A speaker operation test apparatus according to claim 6 is
Low-frequency transmitting means for transmitting a low-frequency signal of a voice band and constant current to a plurality of speakers having different impedances for operation test, and switching means for switching and supplying the low-frequency signal from the low-frequency transmitting means to the plurality of speakers. A low frequency deriving means for outputting a low frequency signal of a level changed based on the impedance of the speaker; a level varying means for amplifying, attenuating or passing the low frequency signal from the low frequency deriving means; and a switching means. And control means for controlling switching of the level varying means for each speaker, and converting means for converting a low frequency signal from the level varying means into a DC level,
The configuration is provided with comparing means for comparing the direct current level with a preset threshold value, and abnormality display means for displaying an abnormality of the speaker when the direct current level from the comparing means exceeds the threshold value.

A speaker operation test apparatus according to claim 7 is
A configuration in which the abnormality display means displays any one or a combination of a light emitting element that lights or blinks the abnormality, a display device that displays a screen with a graphic or a character indicating the abnormality, and a sound output device that notifies the abnormality by sound or synthetic voice. Is.

[0015]

According to the speaker operation test apparatus of the present invention having this structure, a low frequency signal of a voice band and a constant current is sent to the speaker of the operation test, and the level changed based on the impedance of the speaker in this case. The low frequency signal of is converted into a DC level and compared with a preset threshold value. Then, for example, when the low level when the speaker is short-circuited and the high level DC level where the speaker is disconnected exceed the low high level threshold value, the abnormality is displayed. Therefore, normal or abnormal operation of the speaker, for example, disconnection or short circuit of the voice coil path is determined based on the impedance of the speaker.

A speaker operation test apparatus according to claim 6 is
A low-frequency signal of a voice band and a constant current is individually sent to a plurality of speakers of an operation test target, and the low-frequency signal of a level changed based on the impedance of each speaker is converted into a DC level, for example, The abnormalities are displayed when the low level when the speaker is short-circuited and the high level DC level where the speaker is disconnected exceed the low high level thresholds, respectively. Therefore,
Based on the individual impedances of the plurality of speakers, normal or abnormal operation of each speaker, for example, disconnection or short circuit of the voice coil path is determined.

A speaker operation test apparatus according to claim 7 is
When the speaker of the operation test is abnormal, the abnormality is displayed by lighting or blinking, and the abnormality is displayed on the screen by figures or characters. Further, the abnormality is reported by sound or synthetic voice. Therefore, the abnormal display can be confirmed only visually or auditorily. Or, it is displayed in this combination, and in particular, it is easily and surely confirmed even in the dark.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a speaker operation testing apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a speaker operation testing device of the present invention. This example is provided in the siren warning station 23 and the speaker warning station 24 shown in FIGS. 2 and 3 described below,
The operation test of the speaker connected to this device is performed.

In FIG. 1, the system includes a first system,
When performing the operation test of the second and third system speakers,
For example, a constant current signal Sa with a voice band frequency of 1 KHZ, or an amplified signal SA for warning broadcasting or siren notification during normal operation
Switches SW1, SW2, S that select and output 1, 1, SA2, SA3 by any of the control signals C1, C2, C3.
W3 and frequency 1KHZ for impedance measurement
And a constant current output circuit 2 for outputting the constant current signal Sa.

Further, the low and high frequencies in the constant current signal Sa having a frequency of 1 KHZ are removed, and the constant current signal S is passed through the switches SW1 to SW3 to the speakers of the first system to the third system.
A band-pass filter (BPF) 3 for deriving a constant current signal Sa (Sa1, Sa2, Sa3) which is changed by the impedance of the speaker when a is supplied, and three speakers are respectively combined with a plurality of speakers. The constant current signal S from the BPF 3 changes when the impedance when operating as one speaker is, for example, 16 ohm (Ω), 32 Ω or 100 Ω.
It has a variable amplifier 4 which outputs an amplified signal Sb obtained by amplifying a (Sa1, Sa2, Sa3) to a predetermined value, for example, a constant value.

Further, when the speakers of the first system to the third system are, for example, 16 Ω, 32 Ω or 100 Ω, they are matched to the impedance and the first system to the third system are controlled based on the control signals C1 to C3. The operation signal is tested by selecting one of the three speakers and the measured signal S
Speaker impedance switching circuit 5 for outputting d (signal in which the level of the constant current signal Sa (Sa1 to Sa3) changes)
Then, the impedance of the first system speaker is set in the speaker impedance switching circuit 5. For example,
SP1 that sets 16Ω, 32Ω, or 100Ω
The setting circuit 6 and the speaker impedance switching circuit 5 similarly include an SP2 setting circuit 7 for setting the impedance of the second system speaker.

Further, similarly, in the speaker impedance switching circuit 5, the SP3 setting circuit 8 for setting the impedance of the speaker of the third system and the constant current signal Sa (when the operation test of the speakers of the first system to the third system is carried out. Sa1 to Sa
3) is detected, and an abnormal value measurement circuit 9 that outputs an effective value measurement detection signal Se and an abnormal operation of the loudspeakers of the first system to the third system based on the measurement detection signal Se, for example, disconnection or short circuit of the voice coil. An abnormality detection circuit 10 that outputs the detected abnormality detection signal Sp is provided.

Further, using the abnormality detection signal Sp as data,
The first control signals C1 to C3 are used as clock signals, respectively.
Speakers of the third to third systems are selectively measured, and if the measured speakers are abnormal, the display signals St, Su,
A flip-flop (F / F) circuit 11 for outputting Sv,
12 and 13 and switches SW1, SW2 and SW3 for selectively switching the amplified signals SA1 to SA3 or the constant current signal Sa with the control signals C1 to C3 and outputting them.

FIG. 2 is a block diagram showing the construction of a dam discharge warning system equipped with the speaker operation test apparatus of FIG. This example shows a control and monitoring station 2 connected by a wireless line.
1, a relay station 22, a siren warning station 23, and a speaker warning station 24. The speaker operation test apparatus shown in FIG. 1 is provided in the siren warning station 23 and the speaker warning station 24.

The control and monitoring station 21 includes a console 21a, a siren alarm station 23 through the relay station 22, and a speaker alarm station 2
Printer 21 for printing and outputting the alarm response information from No. 4
b, the control and monitoring processor 21c, and the wireless transceiver 21
d and an antenna 21e that transmits and receives and has directivity in the direction of the relay station 22. Furthermore, the relay station 22
Is used for transmission / reception with the control and monitoring station 21, and has an antenna 22a having directivity in this direction, and an antenna 22b used for transmission / reception with the siren alarm station 23 and the speaker alarm station 24 and having directivity in this direction. , Wireless transceiver 22
c and the relay processing device 22d.

The siren alarm station 23 includes an antenna 23a having directivity in the direction of the relay station 22 and a radio transmitter / receiver 23.
b, the siren alarm processing device 23c, the first system to the third system
A speaker 23d composed of three systems, a siren control panel 23e, a siren 23f, and a sound collection microphone 2
3g and are provided. The speaker alarm station 24 has an antenna 24a having directivity in the direction of the relay station 22, a wireless transmission / reception device 24b, a speaker alarm processing device 24c, a speaker 24d, and the control and monitoring station 21 for grasping the surrounding situation. It has a sound collection microphone 24e.

In this case, the first to third system speakers are constructed by combining a plurality of speakers in consideration of the service area (broadcasting direction), and impedances are, for example, 16Ω and 32Ω depending on the configuration. Or 10
It is 0Ω.

In this dam discharge warning system, warning broadcasting and siren notification are carried out from the speakers of the siren warning station 23 and the speaker warning station 24 under the control of the control monitoring station 21 and the relay station 22 through the wireless line. This control monitoring station 21
In the control by, the alarm control information and the relay control information are transmitted by radio waves, and based on this information, the siren warning station 23 and the speaker warning station 24 perform warning broadcasting and siren reporting operations. Further, the alarm response information for this operation is transmitted from the siren alarm station 23 and the speaker alarm station 24 to the control monitoring station 21 via the relay station 22 by radio waves. This alarm response information is printed and output by the printer 21b of the control and monitoring station 21, and the hard copy copies the siren alarm station 23,
The operating state of the speaker alarm station 24 can be identified.

As an example of the alarm response information for such alarm control information, when the siren alarm processing device of the siren alarm station 23 and the speaker alarm station 24 and the speaker alarm processing device identify the operation of the speaker and there is an abnormality, Bit information of speaker 1 (first system) abnormality, speaker 2 (second system) abnormality, speaker 3 (third system) abnormality bit information in the frame of alarm response information (for example, 64 bits)
It is inserted inside and sent out.

FIG. 3 is a circuit diagram showing the detailed construction of the siren alarm station 23 in FIG. 2 equipped with the speaker operation test apparatus shown in FIG. In FIG. 3, this siren warning station 2
Reference numeral 3 denotes a modulation / demodulation unit 30 that demodulates data from a reception signal from the wireless transmission / reception device 23b in FIG. 2 or sends a transmission signal (data) to the wireless transmission / reception device 23b, and a control unit 31 that controls each unit of this device. And an alarm control unit 32 which is controlled by the control unit 31 and controls each unit of the alarm signal processing system.
And an amplifier 33a, 33b, 33c for amplifying and outputting the alarm sound signal for each of the first to third system speakers (speaker 23d in FIG. 2).

Further, the speaker operation test apparatus 35 shown in FIG. 1, an alarm sound output section 37 for outputting an alarm sound signal to the alarm control section 32 under the control of the control section 31, and the sound collecting microphone 23g in FIG. The audio signal (data) from the control unit 3
Monitoring information input section 38 for outputting to 1 and external control information output section 3 for outputting a control signal to an external device under the control of the control section 31.
9 and a switch 40 for manually setting the test of the first to third system speakers.

The siren alarm station 23 in FIG. 2 may also be equipped with the speaker operation test device shown in FIG. In this case, the siren control panel 23e is not provided and the control is not performed, and other configurations are the same as those of the siren alarm station 23 shown in FIG.

FIG. 4 is a circuit diagram showing a detailed configuration of the variable amplifier 4 and the speaker impedance switching circuit 5 shown in FIG. In FIG. 4, the variable amplification unit 4 is the BP in FIG.
A constant current signal Sa (Sa1 to Sa3) from F3 is amplified at the same time, and an operational amplifier 4a composed of a resistor and an operational amplifier element, and similarly composed of a resistor and an operational amplifier element, has a lower amplification degree than the operational amplifier 4a. It has an operational amplifier 5a and a resistor Rc for matching and attenuating the constant current signal Sa (Sa1 to Sa3) to the circuit impedance.

The speaker impedance switching circuit 5 is provided with switches SW11, 12, 13 which are supplied with constant current signals Sa (Sa1 to Sa3) from the variable amplifier 4 to fixed contacts and which are selectively output by the movable contacts. This switch SW
The constant current signals Sa (Sa1 ...
Switch SW2 for outputting the measurement signal Sd selected by turning on / off Sa3) with any of the control signals C1 to C3
1, 22, 23. Switches SW11 to 1
3, fixed contacts are respectively driven by the SP1 setting circuit 6 to the SP3 setting circuit 8, and the first system to the third system, respectively.
It is set by switching so as to match the impedance of the system speaker. For example, 16Ω, 32Ω, 100Ω
Set to either.

FIG. 5 is a circuit diagram showing a detailed structure of the effective value measuring circuit 9 shown in FIG. In FIG. 5, this effective value measuring circuit 9 includes operational amplifiers 9a and 9b for amplifying the measurement signal Sd from the speaker impedance switching circuit 5, diodes D1 and D2 for performing both-wave rectification (detection), and diodes D1 and D2. It has a resistor R and a capacitor C that output a measurement detection signal Se obtained by smoothing the detection signal.

FIG. 6 is a circuit diagram showing a detailed structure of the abnormality detection circuit 10 shown in FIG. In FIG. 6, the abnormality detection circuit 10 outputs the measurement detection signal Se to the resistors R11 and R1.
2, differential amplifiers 10a and 10b forming a window comparator for comparing with a voltage Vcc which is a threshold voltage divided by R13 and outputting a signal indicating an abnormality when the voltage of this threshold voltage is exceeded, and a window comparator. And an inverter 10c that outputs an abnormality detection signal Sp that is a normal rotation of the comparison value signal from.

FIG. 7 is a block diagram showing a detailed structure when a light emitting element (LED) is used in the display circuit 14 shown in FIG. In FIG. 7, the display circuit 14 includes LED drive circuits 44a, 44a, to which the display signals St to Sv from the F / F circuits 11 to 13 indicating the abnormalities of the speakers of the first system to the third system are input, respectively. LEDs 45a and 45 which are turned on by the drive signals from the LED drive circuits 44a to 44c and 44b and 44c, and selectively display the operation abnormality of the speakers of the first system to the third system.
b and 45c.

Next, the operation of this embodiment will be described. A radio wave of control information (command) for performing a speaker operation test from the control monitoring station 21 shown in FIG. 2 is relayed by the relay station 22 and received by the wireless transmission / reception device 23b of the siren warning station 23. The frequency-converted intermediate frequency signal is output to the modulation / demodulation unit 30 shown in FIG. The speaker operation test data demodulated by the modulation / demodulation unit 30 is input to the control unit 31. The control unit 31 controls the alarm control unit 32 based on the data of the speaker operation test and sequentially outputs the control signals C1 to C3 on a predetermined time axis to sequentially perform the speaker operation test. Alternatively, the switch 40 is manually switched to sequentially send the control signals C1 to C3 to perform the test. Hereinafter, this manual switching will be described.

First, the movable contact of the switch SW1 shown in FIG. 1 is driven by the high (Hi) level control signal C1 which is sent by switching the switch 40 to switch in the direction of arrow A in the drawing, and the constant current output circuit. Frequency 1 from 2
The constant current signal Sa of KHZ is supplied to the first system speaker (one of the speakers 23d of the siren alarm station 23 in FIG. 2). The constant current signal Sa (Sa1) in this case is BPF3
Is supplied to. Further, the control signal C1 is supplied to the switch SW21 in the speaker impedance switching circuit 5 shown in FIG. 4 to be turned on (conduction). In this case, the switch SW1 in the speaker impedance switching circuit 5 shown in FIG.
1 is S according to the impedance of the first system speaker
It is set by the P1 setting circuit 6. For example, switch S
For the movable contact of W11, select the top fixed contact in the figure and
It is set to 6Ω. Therefore, the constant current signal Sa1
The measurement signal Sd corresponding to the operational amplifier 4 of the variable amplifier 4 is
a and the switch SW11 and the switch SW21.

This measurement signal Sd (constant current signal Sa1) is double-wave rectified (detected) by the effective value measurement circuit 9, and this measurement detection signal Se is input to the abnormality detection circuit 10. The abnormality detection circuit 10 outputs the abnormality detection signal Sp when the voltage exceeds the threshold voltage of the window comparators of the differential amplifiers 10a and 10b. In this case, the constant current signal Sa having a frequency of 1 KHZ from the constant current output circuit 2 is changed by the impedance of the constant current signal Sa supplied to the first system speaker through the switch SW1.

The impedance of the first system speaker is 1
In the case of normal operation of 6Ω, for example, when the voice coil or the matching transformer is short-circuited, the terminating impedance is lowered and the level of the constant current signal Sa (Sa1) is lowered. The low-level measurement detection signal Se is compared with the threshold value of the voltage divided by the resistors R11, R12 and R13 in the differential amplifier 10b of the abnormality detection circuit 10. When this threshold value is exceeded, a low (Lo) level signal indicating that the first system speaker is abnormal is output to the differential amplifier 1.
0b is output, and further, a high (Hi) level abnormality detection signal Sp that is normally rotated by the inverter 10c is output.

Further, as compared with the case where the impedance of the speaker of the first system is 16 Ω in the normal operation, when the voice coil or the matching transformer is disconnected, the termination impedance becomes high and the level of the constant current signal Sa (Sa1) becomes high. Rises. That is, the level of the measurement detection signal Se becomes high. The high level measurement detection signal Se is compared with the threshold value of the voltage divided by the resistor R11 and the resistors R12 and R13 in the differential amplifier 10a of the abnormality detection circuit 10. When it is equal to or higher than this threshold value, a low (Lo) level signal indicating that the speaker of the second system is abnormal is output from the differential amplifier 10a, and further, a high (Hi) level that is forwardly rotated by the inverter 10c. The abnormality detection signal Sp is output.

High (Hi) level abnormality detection signal Sp
Are input to the data input terminals (D) of the F / F circuits 11 to 13. In this case, at the same time, only the high (Hi) level control signal C1 is applied to the clock signal terminal (CK) of the F / F circuit 11.
7 and the high-level display signal St from the output terminal (Q) is input to the LED drive circuit 44a in FIG. 7, and the LED 45a is turned on. That is, the fact that the speaker of the first system is abnormal such as short circuit or disconnection is displayed by lighting.

Then, similarly to the operation test of the first system speaker, the second system speaker (the speaker 23d of the siren alarm station 23 in FIG. 2 is controlled by the control signal C2 by switching the switch 40). One) of the operation test is performed. First, the control signal C1 becomes low (Lo) level, the movable contact of the switch SW1 shown in FIG. 1 is driven, and the switch SW1 is switched in the direction of arrow B to return. Further, the switch SW is switched by the high (Hi) level control signal C2.
2 switches in the direction of arrow A in the figure and supplies the constant current signal Sa from the constant current output circuit 2 with a frequency of 1 KHZ to the second system speaker.

After that, the operation is the same as the operation test of the speaker of the first system, and in this case as well, processing is performed by the BPF 3, the variable amplifier 4, the speaker impedance switching circuit 5, the effective value measuring circuit 9, and the abnormality detection circuit 10. Then, when the speaker of the second system is abnormal, the high (Hi) level abnormality detection signal Sp is output, and the high (Hi) level abnormality detection signal Sp is output from the F / F circuit 12 to the high level. The display signal Su is input to the LED drive circuit 44b in FIG. 7, and the LED 45b is turned on. That is, the fact that the second system speaker has an abnormality such as a short circuit or disconnection is indicated by lighting.

Also when performing the operation test of the second system speaker, the speaker impedance switching circuit 5 shown in FIG.
The inside switch SW12 is set by the SP2 setting circuit 7 according to the impedance of the second system speaker. For example, the movable contact of the switch SW12 is set to 32Ω by selecting an intermediate fixed contact. Therefore, the constant current signal S
The measurement signal Sd corresponding to a2 is derived through the operational amplifier 4b of the variable amplifier 4 and the switches SW12 and SW22.

Further, similarly, an operation test of the third system speaker (one of the speakers 23d of the siren alarm station 23 in FIG. 2) based on the control signal C3 is performed. First, the control signal C2 becomes low (Lo) level, and
The movable contact of the switch SW2 shown in the figure is driven to switch in the direction of arrow B in the figure and return. In addition, high (H
i) The level of the control signal C3 causes the switch SW3 to switch in the direction of arrow A in the figure, and the frequency 1K from the constant current output circuit 2
The constant current signal Sa of HZ is supplied to the third system speaker.

From this point onward, the operation is the same as the operation test of the first system speaker and the second system speaker.
3, variable amplifier 4, speaker impedance switching circuit 5, effective value measuring circuit 9, abnormality detection circuit 10,
High (Hi) when the third system speaker is abnormal
The level abnormality detection signal Sp is output, and this high (H
i) The high level display signal Sv from the F / F circuit 13 by the level abnormality detection signal Sp is the LED drive circuit 4 in FIG.
4c, and the LED 45c lights up. That is,
It is displayed that the third system speaker has an abnormality such as a short circuit or disconnection.

Also when performing the operation test of the speaker of the third system, the speaker impedance switching circuit 5 shown in FIG.
The switch SW13 therein is set by the SP3 setting circuit 8 according to the impedance of the third system speaker. For example, the fixed contact of the switch SW13 is switched to the fixed contact at the lowest position and 100Ω is set. Therefore,
The measurement signal Sd (constant current signal Sa3) from the resistor Rc of the variable amplifier 4 is switched to the switch SW13 and the switch SW23.
Derived from.

In this embodiment, it is possible to directly confirm the operation of the speaker through whether or not the voice coils of the first to third system speakers operate normally, and it is possible to confirm whether the operation is abnormal or normal. Prove. Further, it is not necessary to manufacture and use a special speaker as in the conventionally used triple winding type operation test.

Thus, the abnormal operation of the speakers of the first system to the third system is caused by the LED 4 shown in FIG.
It can be accurately determined by lighting 5a to 45c. In addition, LED4
If 5a is configured with one LED, LED45b is configured with two LEDs that are simultaneously lit, and LED45c is configured with three LEDs that are simultaneously lit, then each of the first to third systems can be displayed even in the dark. The abnormality is LE
It can be easily and surely determined from the number of lights of D.

Next, another configuration example of the display circuit 14 shown in FIG. 1 will be described. FIG. 8 is a block diagram showing a detailed configuration when the display circuit 14 shown in FIG. 1 notifies an abnormality by synthetic voice. In FIG. 8, this display circuit 14 is
The audio information read control circuits 50a, 50b, to which the display signals St-Sv indicating the case where the speakers of the first system to the third system are abnormal are respectively input from the F circuits 11 to 13,
50c is provided. Further, the display signals St to Sv
Based on the above, the audio information read control circuits 50a to 50c read out and respectively output voice information storage section 51 for storing information of a sound signal or a synthetic voice signal indicating an abnormality, and a speaker 53 for outputting a sound or a synthetic voice indicating an abnormality. And have.

In this configuration, the display signals St to Sv from the F / F circuits 11 to 13 are transmitted to the voice information read control circuit 50a to.
50c, that is, when the speakers of the first system to the third system are abnormal, the audio information read control circuit 50
a to 50c read information of a sound signal indicating an abnormality or a synthesized voice signal from the output voice information storage unit 51 and output the information from the speaker 53.

In this case, if the abnormalities of the loudspeakers of the first system to the third system are respectively displayed within a fixed time, for example, by sending out one or two or three sounds in two seconds, it can be displayed even in the dark. It becomes possible to identify the abnormality of the speakers of the first system to the third system by hearing only. Similarly, when the abnormality is notified by the synthetic voice, if the first system to the third system are divided and notified, the abnormality of the speakers of the first system to the third system can be easily and surely identified.

Next, FIG. 9 is a block diagram showing a detailed configuration when the display circuit 14 shown in FIG. 1 displays an abnormality on the screen display. In FIG. 9, the display circuit 14 receives the display information read control circuit 60a from the F / F circuits 11 to 13 to which the display signals St to Sv indicating the cases where the speakers of the first system to the third system are abnormal are input. , 60b, 60
c is provided. Further, based on the display signals St to Sv, the display information read control circuits 60a to 60c read the display information, and the display information storage unit 61 for storing information such as characters and figures indicating the abnormality, the LCD drive circuit 62, and the abnormality information. Liquid crystal display (L
CD) 63.

In this configuration, the display signals St to Sv from the F / F circuits 11 to 13 are transmitted to the display information read control circuit 60a to.
60c, that is, when the speakers of the first system to the third system are abnormal, the display information read control circuit 60
The a to 60c read out information such as characters and figures indicating an abnormality from the display information storage section 61 and display them on the LCD 63 through the LCD drive circuit 62. In this case, the abnormality of the speakers of the first system to the third system can be visually confirmed accurately.

In the display circuit 14, an abnormality display by lighting the LEDs 45a to 45c shown in FIG. 7, output of sound or synthetic voice from the speaker 53 shown in FIG.
The screen display on the LCD 63 shown in FIG. 9 can be selected, or combined and displayed. FIG. 10 is a circuit diagram showing the configuration of a selection switch when one of the abnormal display by lighting, output of sound or synthetic voice, and screen display is selected or displayed in combination. In FIG. 10, the selection switch is a display signal S for the LED 45a shown in FIG.
switch SW31a for turning on / off the supply of t, and FIG.
The switch SW31b for turning on / off the supply of the display signal St to the audio information read control circuit 50a shown in FIG. 9 and the switch SW31c for turning on / off the supply of the display signal St to the display information read control circuit 60a shown in FIG. Have

Further, a switch SW32a for turning on / off the supply of the display signal Su to the LED 45b shown in FIG.
A switch SW32b for turning on / off the supply of the display signal Su to the audio information read control circuit 50b shown in FIG.
The display signal S to the display information read control circuit 60b shown in FIG.
It has a switch SW32c for turning on / off the supply of u. In addition, the display signal S to the LED 45c shown in FIG.
A switch SW33a for turning on / off the supply of v, and FIG.
The switch SW33b for turning on / off the supply of the display signal Sv to the audio information read control circuit 50c shown in FIG. 9 and the switch SW33c for turning on / off the supply of the display signal Sv to the display information read control circuit 60c shown in FIG. Have

Further, the switches SW31a to SW31c
First system display setting unit 70 for setting ON / OFF of the switch, second system display setting unit 71 for setting ON / OFF of the switches SW32a to SW32c, and switches SW33a to SW33
Third system display setting unit 72 for setting ON / OFF of 33c
And have.

Next, in this configuration, the switches SW31a to SW31c are individually turned on or off in the first system display setting section 70 to turn on the LED 45a from the speaker 53 for the abnormality of the first system speaker. One of output of sound or synthetic voice and screen display on the LCD 63 is selected or displayed in combination. Further, by setting the switches SW32a to SW32c individually on or off in the second system display setting unit 71, the abnormality of the second system speaker is turned on by turning on the LED 45b and the speaker 53.
One of the output of the sound or the synthetic voice and the screen display on the LCD 63 is selected or displayed in combination.

Further, by setting the switches SW33a to SW33c individually on or off in the third system display setting section 72, the abnormality of the third system speaker is detected by the LED4.
One of the lighting of 5c, the output of sound or synthetic voice from the speaker 53, and the screen display on the LCD 63 is selected or displayed in combination.

As described above, one of the abnormal display due to the lighting of the LEDs 45a to 45c, the output of the sound or the synthesized voice from the speaker 53, and the screen display on the LCD 63 or a combination thereof can be displayed. Will be obtained.

[0063]

As is apparent from the above description, the speaker operation test device according to the first to fifth aspects sends a low frequency signal of a voice band and a constant current to the speaker of the operation test target,
In this case, the low-frequency signal of the level changed based on the impedance of the speaker is converted into a DC level and compared with a preset threshold value, and when the threshold values are exceeded, the abnormality is displayed. Therefore, there is an effect that the normal or abnormal operation of the speaker can be reliably determined based on the impedance of the speaker.

The speaker operation test apparatus according to claim 6 is
Low frequency signals of voice band and constant current are individually sent to a plurality of speakers for operation test, and the low frequency signals of the level changed based on the impedance of each speaker are converted into DC level. Compared with the threshold value, if it exceeds the threshold value, the abnormality is displayed, so there is an effect that it is possible to reliably determine whether the individual speaker is normal or abnormal based on the individual impedances of the plurality of speakers. .

A speaker operation test apparatus according to claim 7 is
When the speaker under the operation test is abnormal, the abnormality is displayed by lighting or blinking, and the abnormality is displayed on the screen in figures or characters.Also, the abnormality is reported by sound or synthetic voice. The display is visually or audibly confirmed, or
This has the effect of displaying with this combination.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a speaker operation testing device of the present invention.

FIG. 2 is a block diagram showing a configuration of a dam discharge warning system equipped with the speaker operation test device of FIG.

FIG. 3 is a circuit diagram showing a detailed configuration of a speaker alarm station equipped with the speaker operation testing device in FIG.

FIG. 4 is a circuit diagram showing a detailed configuration of a variable amplifier section and a speaker impedance switching circuit in FIG.

5 is a circuit diagram showing a detailed configuration of an effective value measuring circuit in FIG.

6 is a circuit diagram showing a detailed configuration of an abnormality detection circuit in FIG.

7 is a block diagram showing a detailed configuration when a light emitting element (LED) is used in the display circuit in FIG.

FIG. 8 is a block diagram showing a detailed configuration when the display circuit in FIG. 1 notifies an abnormality by synthetic voice.

FIG. 9 is a block diagram showing a detailed configuration when the display circuit in FIG. 1 displays an abnormality on a screen display.

FIG. 10 is a circuit diagram showing a configuration for turning on a speaker abnormality, outputting a sound or synthetic voice, and selectively displaying a screen display in the embodiment.

[Explanation of symbols]

 2 constant current output circuit 4 variable amplification section 5 speaker impedance switching circuit 9 effective value measurement circuit 10 abnormality detection circuit 11 to 13 F / F circuit 14 display circuit 21 control monitoring station 22 relay station 23 siren alarm station 23c siren alarm processing device 23d Speakers 24, 53 Speaker alarm stations 45a to 45c LEDs 50a to 50c Voice information read control circuit 51 Output voice information storage unit 60a to 60c Display information read control circuit 61 Display information storage unit 63 LCD

Claims (7)

[Claims] 1. A low-frequency transmitting means for transmitting a low-frequency signal to a speaker as an operation test target, a low-frequency deriving means for outputting a low-frequency signal having a level changed based on the impedance of the speaker, and the low-frequency deriving means. Converting means for converting the low frequency signal from the means to a direct current level, comparing means for comparing the direct current level with a preset threshold value, and if the direct current level from the comparing means exceeds the threshold value, A speaker operation test apparatus comprising: an abnormality display unit for displaying an abnormality of the speaker. 2. The speaker operation test device according to claim 1, wherein the low frequency transmitting means uses a constant current output circuit for outputting a low frequency signal of a constant current in a voice band to the speaker. 3. The speaker operation according to claim 1, wherein the low-frequency deriving means uses a bandpass filter connected to the speaker and the low-frequency transmitting means to derive a low-frequency signal that changes with the impedance of the speaker. Test equipment. 4. The speaker operation test apparatus according to claim 1, wherein the conversion means uses a detection circuit that outputs a DC level signal obtained by detecting the low frequency signal from the low frequency derivation means. 5. The speaker operation test apparatus according to claim 1, wherein the comparison means uses a window comparator for comparing the DC level from the conversion means with at least two thresholds having different levels. 6. A low-frequency transmitting means for transmitting a low-frequency signal of a voice band and a constant current to a plurality of speakers having different impedances for an operation test, and a low-frequency signal from the low-frequency transmitting means to each of the plurality of speakers. Switching means for switching and supplying, low-frequency deriving means for outputting a low-frequency signal of a level changed based on the impedance of the speaker, and amplifying, attenuating, or passing the low-frequency signal from the low-frequency deriving means. Level changing means for controlling, switching means and control means for controlling switching of the level changing means for each speaker, converting means for converting a low frequency signal from the level changing means to a direct current level, and presetting the direct current level Comparing means for comparing with the threshold value, and the speaker of the speaker when the direct current level from the comparing means exceeds the threshold value. Speaker operation test device comprising an abnormality display means for displaying the normal, the. 7. The abnormality display means is any one of a light emitting element that lights or blinks the abnormality, a display device that displays a screen with a graphic or a character indicating the abnormality, and a sound output device that issues a sound or a synthetic voice to notify the abnormality, or 7. The speaker operation test device according to claim 1, wherein the speaker operation test device displays the combination.