JP2002260131A - Monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device capable of verifying that an apparatus operates properly, and surely reporting occurrence of an emergency. SOLUTION: A transmitter 2 always transmits a wave, and when an input signal is provided, it modulates the waves and transmits them. Corresponding to an operating signal from the operation of an operation switch 6, an alarm signal is provided as an input signal from an alarm signal generating section. A receiver 22 is located at a distance from the transmitter 2 and receives the wave from the transmitter 2. When the receiver 22 is not receiving the wave, a display 48 displays 'abnormal', and when the receiver 22 is receiving the wave, the display 48 displays 'normal'. When the receiver 22 is receiving the wave and demodulating the alarm signal, the display 48 has a displayed 'emergency' on it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a monitoring device,
In particular, the present invention relates to a method in which monitoring results are transmitted using radio waves.

[0002]

2. Description of the Related Art Generally, in a financial institution such as a bank, a counter or the like in which an employee directly faces a customer has no trouble or robbery between the employee and the customer. A monitoring device may be provided to monitor a remote location for an incident. As this monitoring device, for example, a microphone is provided in a counter. The audio signal from the microphone is supplied to a transmitter provided near the counter, and transmitted from the transmitter. The signal from the transmitter is received by a receiver in a monitoring room at a location remote from the counter.

[0003] An audio signal from a microphone is always supplied to a transmitter, and the transmitter constantly transmits a transmission signal based on the audio signal. Alternatively, only when an employee at a counter operates an operation switch, a signal from the microphone is transmitted. An audio signal is supplied to a transmitter, and the transmitter operates to transmit a transmission signal.

[0004]

However, if the sound signal from the microphone is constantly transmitted, the state of the counter can always be monitored on the monitoring room side. Many such microphones are often installed. When simultaneously monitoring sounds from a large number of microphones, attention may be lost, and it may not be possible to immediately recognize which microphone installation location is in an emergency situation.

In the case where the transmitter operates only when the switch is operated on the counter side, the fact that the transmission from the transmitter itself indicates that an emergency has occurred. Although there is no such problem, for example, if there is an abnormality in the transmitter and the transmitter is not operating properly, even if an emergency occurs on the monitoring room side,
We cannot know this.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a monitoring device that can confirm that a device is operating normally and can reliably report occurrence of an emergency.

[0007]

The monitoring device according to the present invention has a transmitting unit. The transmitting unit constantly transmits radio waves, and when an input signal is supplied, the transmitted radio waves are modulated. In response to a detection signal from a sensor or an operation signal generated by operating the operation means, an alarm signal generation unit supplies an alarm signal as the input signal to the transmission unit. As the sensor, for example, there is a human body detecting means provided in a place where a person does not originally pass, for example, a photoelectric switch or a mat switch. As the operation means, for example, there is a switch manually operated by a human. A receiving unit is arranged at a position apart from the transmitting unit, and the receiving unit receives a radio wave from the transmitter. This receiving unit can be provided in the monitoring room or, for example, can be provided at a position remote from the monitoring room. When provided at a distant position, the signal received by the receiving unit is transmitted to the monitoring room via the transmission line. A determination unit to which a signal from the receiving unit is input is provided. This determining unit is provided in the monitoring room when the receiving unit is provided in the monitoring room. When the receiving unit is provided in a place different from the monitoring room, the determining unit may be provided in the monitoring room or may be provided in the same place as the receiving unit. The determining unit outputs an abnormal output when the receiving unit is in the non-receiving state of the radio wave, outputs a normal output when the receiving unit is in the receiving state of the radio wave, and the receiving unit is in the receiving state of the radio wave, and An emergency output is output when the alarm signal is demodulated. Based on each output of the judging unit, the information is supplied to a notifying unit, for example, a display device, and the display unit performs display according to the normal output, the abnormal output, and the emergency output. Note that an audible frequency sound generator such as a buzzer may be used as the notification means.

[0008] In such a monitoring apparatus, since the transmitting section is always operating, the determining section generates a normal output as long as the transmitting section operates normally. When the transmitting unit is not operating normally, the determining unit generates an abnormal output. Therefore, as long as a normal output is generated, it is possible to confirm that a wireless transmission path is established between the transmission unit and the reception unit. It can be confirmed that a wireless transmission path has not been established between the receiver and the receiver, and it is possible to take prompt action. Further, when an emergency actually occurs, an alarm signal is input to the transmission unit, and the determination unit generates an emergency output. Therefore, even if a large number of monitoring devices are provided in parallel, You can check if an emergency has occurred near the aircraft.

[0009] The transmitting section may be such that a tone signal is supplied as the input signal in a state where radio waves are constantly transmitted. In this case, the determination unit outputs the abnormal output when the reception unit does not demodulate the tone signal,
The receiving section outputs the normal output when demodulating the tone signal, and outputs the abnormal output when the receiving section demodulates the tone signal and the alarm signal.

[0010] When the transmitting unit is constantly transmitting, for example, it is conceivable to transmit only a carrier wave and to detect the carrier wave on the receiving unit side. However, in this method, when there is an interference source that generates a carrier wave of the same frequency in the vicinity,
There is a possibility that the determination unit may erroneously receive the jamming radio wave and erroneously determine the normal output. In order to prevent this, a tone signal is supplied as an input signal to the transmitter, and a carrier modulated with the tone signal is transmitted from the transmitter. When the tone signal is demodulated on the receiving side, it is normal. And the determination unit makes the determination, there is no possibility of the malfunction as described above. Note that, in addition to the detection of the tone signal, the determination unit also performs the detection of the carrier wave and the detection of the noise, and when all of them are detected, it is determined that the signal is normal.

[0011] The transmitting section may receive a first tone signal as the input signal in a state where radio waves are constantly transmitted. In this case, the alarm signal generation unit
A second tone signal is generated as the alarm signal. Further, the determining unit outputs the abnormal output when the receiving unit does not demodulate the first and second tone signals, and outputs the normal output when the receiving unit demodulates the first tone signal,
The emergency output is output when the receiving section demodulates the first and second tone signals.

[0012] In the case of such a configuration, the transmitter includes the first transmitter.
A modulated signal obtained by modulating a carrier with a tone signal is always transmitted,
A modulated signal obtained by modulating a carrier with the first and second tone signals is transmitted according to the detection of the sensor or the operation of the operation means. Therefore, similarly to the above-described modified example, it is possible to reliably confirm whether or not the signal is normal even in the state where the interference signal source exists. In addition, since the second tone signal is used as the alarm signal, the detection of the second tone signal allows other devices, for example, a revolving imaging device to transmit the second tone signal to the transmitter that has generated the second tone signal. The swiveling type imaging device can be swung so as to image the vicinity of the installed location.

One set can be constituted by one transmitting unit, one alarm signal generating unit, and one sensor or operating means. A plurality of such sets are provided. Each set is arranged at a different position, and the frequency of the radio wave of each transmitter is set to a different one. Only one receiving unit is provided, and is configured to be able to receive the radio waves of the different frequencies. A control unit is provided for controlling the receiving unit such that the receiving unit repeatedly receives radio waves of different frequencies in order.

In such a configuration, since the receiving unit receives radio waves of different frequencies in order, each time the receiving unit is set to receive a different radio wave, the radio wave is normally transmitted from the transmitter. The determination unit can determine whether or not there is a request. In this case, since only one receiving unit needs to be provided, the configuration of the monitoring device can be simplified.

[0015] In the above configuration, further, a different audio signal can always be supplied to each transmitting section as the input signal. In this case, the control unit controls the receiving unit to maintain the receiving state at the frequency when the determination unit outputs the emergency output in any of the radio wave receiving states of the respective frequencies. .

With this configuration, if a radio wave based on the alarm signal is transmitted from any of the transmitters, the receiving unit is fixed at a state in which the radio wave is received. as a result,
The audio signal supplied to the transmitter transmitting the radio wave based on the alarm signal can also be received by the receiving unit, and the state can be confirmed by audio.

[0017]

1 to 4 show a monitoring apparatus according to a first embodiment of the present invention. This monitoring device has a transmitter 2 as shown in FIG. The transmitter 2 is supplied with a sound signal from a sound collecting means, for example, a microphone 4. The transmitter 2 and the microphone 4 are installed in a monitoring area, for example, a counter of a bank. The counter is provided with operation means, for example, an operation switch 6, at a position invisible to the customer.

The transmitter 2 is configured, for example, as shown in FIG. That is, the audio signal from the microphone 4 is amplified by the amplifier 8. The amplified audio signal is supplied to the modulation / oscillation unit 12 via the synthesizer 10. The modulation oscillating unit 12 oscillates a carrier having a predetermined frequency, and the carrier is modulated by the output of the combiner 10 to generate a modulated signal. Various known modulation schemes are used. This modulation oscillator 1
2 are amplified by the high-frequency amplifier 14 and transmitted from the transmission antenna 16. Here, the audio signal from the microphone 4 is always supplied to the modulation oscillating unit 12 via the amplifier 8 and the synthesizer 10,
The high-frequency amplifier 14 is also constantly operating. Therefore, a modulated signal modulated by the audio signal of the microphone 4 is always transmitted.

The synthesizer 10 is supplied with an alarm signal, for example, an alarm signal from an alarm signal generator, for example, an alarm signal generator 20 via an open / close switch 18. As the alarm signal, a tone signal having a frequency apart from the frequency band of the audio signal can be used. Alternatively, a digital signal having a specific code outside the frequency band of the audio signal may be used as the alarm signal.

The open / close switch 18 is configured to be closed when the operation switch 6 is operated. Therefore, when the operation switch 6 is operated, the alarm signal is supplied to the synthesizer 10, is synthesized there with the audio signal, is supplied to the modulation oscillating unit 12, and is modulated by the audio signal and the alarm signal. Is transmitted from the transmitter 2.
The operation switch 6 is operated by a bank employee, for example, when a robbery case or the like occurs.

As shown in FIG. 1, this monitoring apparatus has a receiver 22 at a position remote from a monitoring area where the transmitter 2 and the like are provided, for example, in a monitoring room provided in a bank or the like. I have. As shown in FIG. 3, the receiver 22 amplifies the modulated signal received by the receiving antenna 24 with a high-frequency amplifier 26, and amplifies the amplified modulated signal by a local oscillation signal generated by an oscillator 30 in a frequency converter 28. Frequency conversion to an intermediate frequency signal. The intermediate frequency signal is amplified by the intermediate frequency amplifier 32 and then demodulated in the demodulation unit 34 to generate a demodulated signal. Here, if the transmitter 2 is modulated only with the audio signal from the microphone 4, the demodulated signal is only the audio signal. When the transmitter 2 modulates the carrier with the audio signal from the microphone 4 and the alarm signal, the demodulated signal is a composite signal of the audio signal and the alarm signal.

The demodulated signal is amplified by, for example, a low-frequency amplifier 36 having a filter for extracting an audio signal, and then supplied to a speaker 40 in a display unit 48 to be described later via an open / close switch 38. Further, the demodulated signal is supplied to the determination unit 42.

The judgment section 42 includes a radio wave detection section 44 and an alarm signal detection section 46. For example, when the demodulated signal includes an audio signal, the radio wave detection unit 44 generates an output signal of an H level, for example, assuming that a radio wave, that is, a modulated signal is detected.
Generates a level output signal. Instead of detecting the audio signal, the level of the output signal of the intermediate frequency amplifying unit 32 is detected, and if the level is higher than a predetermined level, it is determined that a radio wave has been detected and an H level output signal is generated. It may be configured as follows.

If the alarm signal is a tone signal, for example, the alarm signal detector 46 includes a filter for extracting the frequency of the tone signal. If the level of the output signal of the filter is higher than a predetermined level, for example, When an H-level output signal is generated and a tone signal higher than a predetermined level cannot be obtained, for example, an L-level output signal is generated. When the alarm signal is a digital signal having a predetermined code, a decoder is provided. When the digital signal has a predetermined code, for example, an output signal of H level is generated.

The output signals of the radio wave detection unit 44 and the alarm signal detection unit 46 are supplied to a display unit 48. The display unit 48 includes, for example, a speaker 40 and an open / close switch 38 as shown in FIG. 4, and further includes a line abnormality indicator light 50, a normal indicator light 52, and an emergency indicator light 54. These indicator lights 50, 52, 54 are controlled by a drive unit 56 shown in FIG. The drive unit 56 is supplied with the output signals of the radio wave detection unit 44 and the alarm signal detection unit 46. The drive unit 56 turns on the line abnormality indicator lamp 50 when the output signal of the radio wave detection unit 44 is at the L level. Let it. When the output signal of the radio wave detection unit is at the H level, the normal indicator lamp 52 is turned on. When the output signals of the radio wave detection unit 44 and the alarm signal detection unit 46 are both at the H level, the emergency indicator 5
4 is turned on.

Therefore, when the normal indicator light 52 is on, a wireless transmission path is formed between the transmitter 2 and the receiver 22, and if any emergency occurs, this can be notified. It turns out that it is in a state. Also,
When the line abnormality indicator light 50 is on, the transmitter 2
It can be seen that no wireless transmission path is formed between the receiver and the receiver 22, and even if an emergency occurs, the state is not notified. In this case, an inspection request is immediately made.

When an emergency occurs, the emergency indicator light 54 is lit, indicating that an emergency has occurred. In this case, when the open / close switch 38 is open and the audio signal is not supplied to the speaker 40, the open / close switch 38 is closed and the audio signal is amplified from the speaker 40, and the situation is grasped. Note that the drive unit 56 may drive an audible sound generator such as a buzzer instead of or in addition to the emergency indicator light 54.

When such an audible sound generator is used, an audible sound generation start signal and an audible sound generation stop signal generated after a lapse of a predetermined time, for example, as an alarm signal. May be configured to be generated by the alarm signal generation unit 20. In this case, for example, as the generation start instruction signal and the generation stop instruction signal, a DTMF signal or a digital data signal can be instantaneously supplied within the audio band. In the above-described embodiment, the alarm signal is supplied to the synthesizer 10 by operating the operation switch 6. However, a sensor is provided in a specific monitoring area, and when the sensor detects a human body, for example. , An alarm signal may be supplied to the synthesizer 10. In this case, the audio signal is not necessarily
There is no need to supply 0, and an unmodulated carrier may be transmitted.

FIG. 5 shows a monitoring apparatus according to the second embodiment. In this embodiment, the transmitters 2a to 2d, the microphones 4a to 4d, and the operation switches 6a to 6d are arranged in different monitoring areas, for example, four monitoring areas. Then, the transmitter, the microphone, and the operation switch in the same monitoring area constitute one set. The configurations of the transmitters 2a to 2d, the microphones 4a to 4d, and the operation switches 6a to 6d are the same as those of the transmitter 2, the microphone 4, and the operation switch 6 of the first embodiment, and thus detailed description is omitted. . Note that the frequencies of the carrier waves of the transmitters 2a to 2d are set to different frequencies in order to prevent interference.

Receivers 22a to 22d corresponding to the transmitters 2a to 2d are arranged in a monitoring room at a position apart from each monitoring area. These receivers 22a to 22
d is configured similarly to the receiver 22 of the first embodiment, but the receiver 22a transmits radio waves from the transmitter 2a,
The receiver 22b transmits radio waves from the transmitter 2b to the receiver 22b.
c is configured to receive a radio wave from the transmitter 2c, and the receiver 22d is configured to receive a radio wave from the transmitter 2d.

The detection signals of the radio wave detection unit and the alarm signal detection unit and the low frequency amplified audio signal from the receivers 22a to 22d are supplied to the display unit 48a.
This display unit 48a integrates a plurality of display units 48 shown in the first embodiment, and only one speaker 40a is used as a speaker.
Since the configuration is the same except that only the units are shared, detailed description is omitted. Reference numerals 50a to 50d in FIG.
Reference numerals a to 52d denote respective normal indicator lights,
Reference numerals a to 54d denote emergency indicator lights, respectively.
Reference numerals a to 38d denote on / off switches.

This monitoring apparatus is suitable for simultaneously monitoring the states of a plurality of monitoring areas, and has the same effects as the first embodiment. Furthermore, it is impossible for the observer to hear all of the sounds from the plurality of monitoring areas at the same time, but for example, when any of the emergency indicator lights is lit when the observer is listening to the sound of the specific monitoring area By operating the open / close switch corresponding to the emergency indicator light, it is possible to hear the sound of the monitoring area where the emergency occurs. In this case, each of the on / off switches 38a to 38d is configured such that when one of them is closed, when the other is closed, the on / off switch which has been closed is opened. It is desirable.

The monitoring device according to the third embodiment of the present invention comprises:
As shown in FIG. 6, an imaging device 100 is provided. The imaging device 100 is attached to a ceiling 102 of a bank or the like, for example. The imaging device 100 is, for example, a ceiling 10
2 around an axis perpendicular to and perpendicular to this axis
That can be turned around respective axes parallel to. By turning the imaging device 102, it is possible to respectively image a plurality of locations in the bank, for example, two monitoring areas. Note that the imaging device 1
00 is provided with a control device (not shown), and alternately captures images of two monitoring areas by the control device.

These monitoring areas are, for example, the counter 104
a and 104b respectively. These counters 104
The microphones 204a, 204b,
Transmitters 202a, 202b, operation switches 206a, 2
06b, and transmission antennas 16a and 16b are provided. Microphones 204a, 204b, operation switch 2
06a, 206b and the transmitting antennas 16a, 16b are the same as the microphone 4, the operation switch 6, and the transmitting antenna 16 of the monitoring device of the first embodiment.
Detailed description is omitted.

Since the transmitters 202a and 202b have the same configuration, only the transmitter 202a will be described. As shown in FIG. 7, the transmitter 202a has a transmission unit 208. The transmission unit 208 includes the modulation oscillation unit 12 and the high-frequency amplification unit 14 according to the first embodiment. It should be noted that the frequencies of the carrier waves are different between the transmitters 202a and 202b.

An audio signal from the microphone 204 a is input to the input side of the transmission unit 208 via the audio switch 210. The audio switch 210 is supplied with a first tone signal from a first tone generator 212. The first tone signal has a frequency outside the audio frequency band. The voice switch 210 includes the voice switch 21
4, a second tone signal is supplied from the second tone generator 215 as an alarm signal. The second tone signal is
The frequency is out of the audio frequency band and different from the first tone signal.

The audio switches 210 and 214 include a control unit,
For example, the CPU 216 controls opening and closing. CPU2
Reference numeral 16 denotes an audio switch 210 when a constant transmission switch (not shown) is operated and a constant transmission command signal is supplied.
Is closed, and the audio signal from the microphone 204 a and the first tone signal from the first tone generator 212 are supplied to the transmission unit 208. When the operation switch 6a is operated and the second tone signal transmission command signal is supplied in a state where the transmission command signal is always supplied, the CPU 216 closes the audio switch 214 and the second tone signal Via the audio switches 214 and 210
8 As a result, the transmitting unit 208 outputs the audio signal,
The carrier is modulated with the first and second tone signals.

Radio waves transmitted from the transmitters 202a and 202b are received by a single receiving antenna 106 provided near the imaging device 100, for example, in the ceiling 102, as shown in FIG. This receiving antenna 10
6 is received by the image combiner 1 by the combiner 108.
It is combined with the baseband imaging signal from 00. In addition,
The frequency of the radio waves from the transmitters 202a and 202b and the frequency band of the baseband image signal are set to be non-overlapping. The synthesized signal is transmitted to a monitoring room at a position distant from each monitoring area via a transmission path originally provided for transmitting the imaging signal, for example, a coaxial cable 110.

A demultiplexer 112 is provided in the monitoring room, and demultiplexes the synthesized signal into a baseband image signal and a received signal. The baseband imaging signal is supplied to the monitor 114, and images of two monitoring areas are alternately and repeatedly displayed on the monitor 114.

The received signal is supplied to a receiver 116.
As shown in FIG. 8, the receiver 116 has a tuning unit 220 to which a received signal is supplied. The tuning unit 220 includes the first
This corresponds to the high-frequency amplifier 26, the frequency converter 28, the local oscillator 30, the intermediate frequency amplifier 32, and the demodulator 34 of the receiver 22 of the embodiment. However, the local oscillator is variable in frequency, and is controlled by a control unit, for example, the CPU 2.
A local oscillation signal having two frequencies specified by the scan selection signal supplied from the control unit 22 is generated. One frequency is a frequency necessary to convert a radio wave from the transmitter 202a to an intermediate frequency signal, and the other frequency is a frequency necessary to convert a radio wave from the transmitter 202b to an intermediate frequency signal. Frequency. In a scan mode described later, local oscillation signals of these two frequencies are generated repeatedly and alternately.

As the output signal, a signal obtained by synthesizing the audio signal and the first tone signal or a signal obtained by synthesizing the audio signal and the first and second tone signals is output from the tuning section 220. The output signal of the tuning unit 220 is supplied to a speaker (not shown) via the audio switch 224.
The voice switch 224 is controlled to be opened and closed by the CPU 222.

The output signal of the tuning section 220 is supplied to a first tone detecting section 225 and a second tone detecting section 226 constituting a judging section. The first tone detection unit 225 supplies the first tone detection signal to the CPU 222 when the output signal of the tuning unit 220 includes the first tone signal.
Further, the second tone detection unit 226 supplies the second tone detection signal to the CPU 222 when the output signal of the tuning unit 220 includes the second tone signal.

The determination section also includes a noise detection section 228 and a carrier detection section 230. Noise detector 2
Reference numeral 28 denotes the input of the intermediate frequency signal of the tuning unit 220, the detection of the level of noise included in the signal, and the detection of noise when the tuning unit 220 can determine that the radio wave from the transmitter 202a or 202b is being received. Signal to CPU2
22. The carrier detection unit 230 is also a tuning unit 220
From the transmitter 202a or 2 in the tuning unit 220 from the level of the carrier of the intermediate frequency signal.
When it is determined that the radio wave from 02b is received, a carrier detection signal is supplied to the CPU 222.

The CPU 222 controls the noise detector 22
8. Based on output signals from the carrier detector 230, the first tone detector 225, and the second tone detector 226, abnormality detection, alarm detection, and the like are performed.

Hereinafter, control in the scan mode performed by the CPU 222 will be described with reference to the flowchart shown in FIG. Note that the transmission command signals are always supplied to the transmitters 202a and 202b, and the transmitters 202a and 202b
It is assumed that the audio switch 210 of 202b is closed, and a modulated signal obtained by modulating a carrier with the first tone signal and the audio signal is transmitted from each of the transmitters 202a and 202b.

The CPU 222 initially supplies a scan selection signal to the tuning unit 220 (step S2). Transmitter 2
The tuning unit 220 is instructed to receive a radio wave from any one of 02a and 202b.

It is determined whether a noise detection signal is generated due to the modulation signal from the selected transmitter (step S4). If a noise detection signal has not been generated, a wireless transmission path has not been established between the selected transmitter and receiver 116, so that an abnormality detection signal is transmitted (step S6). Based on this abnormality detection signal, for example, an abnormality detection indicator (not shown) is turned on. Note that transmitter data indicating whether a transmission path has not been established with any of the transmitters is generated based on the scan selection signal,
It is desirable to transmit this together with the abnormality detection signal. When the abnormality detection is completed, a scan selection signal specifying the next transmitter is supplied to the tuning unit 220 (Step S8), and Step S4 is executed again.

If it is determined in step S4 that a noise detection signal has been generated, it is determined whether a carrier detection signal has been generated (step S10). If it is determined that the carrier detection signal has not been generated, steps S6 and S8 are executed, and the steps are executed again from step S4.

If it is determined in step S10 that a carrier detection signal has been generated, it is determined whether a first tone detection signal has been generated (step S12). If the first tone detection signal has not been generated, steps S6 and S8 are executed, and the processing is executed from step S4.

If it is determined in step S12 that the first tone detection signal has been generated, that is, if the noise detection signal has been generated, the carrier detection signal has been generated, and the first tone detection signal has been generated. It is determined that a transmission path is established between the transmitter designated by the scan selection signal and the tuning unit 220 via radio. Since the inspection is performed in triplicate in this manner, the first inspection is performed in step S12.
When the tone detection signal is detected, the transmission path has been reliably established.

When the first tone detection signal is detected in step S12, it is determined whether the second tone detection signal has been generated. That is, it is determined whether or not an emergency has occurred in the transmitter selected by the scan selection signal and the operation switch has been operated. If it is determined in step S14 that the second tone detection signal has not been generated, the scan selection signal is changed so as to designate the next transmitter (step S16), and step S4 is executed.

If it is determined in step S14 that the second tone detection signal has been generated, it is determined that an emergency has occurred in the transmitter selected by the scan selection signal. The alarm is maintained (step S18), and an alarm signal is output (step S20). As a result, for example, an alarm indicator (not shown) is turned on, and the audible sound generator is activated to notify the occurrence of an emergency. Note that the transmitter data is used to indicate in which monitoring area an emergency has occurred.
It is desirable to generate based on the scan selection signal and send this together with the alarm signal.

Further, by stopping the scanning, it becomes possible to hear the sound in the monitoring area where the emergency has occurred, so that the sound switch 224 is closed and the tuning unit 2 is closed.
The demodulated audio signal is output at 220 (step S2).
2). Then, transmitter data indicating a transmitter in which an emergency has occurred is output (step S24). The transmitter data is transmitted to the imaging device 100, and the imaging device 100 captures an image of a monitoring area where an emergency has occurred. The transmission of the transmitter data may be performed via the coaxial cable 110 or may be performed using another control transmission line.
As a result, an image of the monitoring area in which the emergency has occurred is displayed on the monitor 114, and its sound is output from a speaker (not shown), so that the state of the emergency can be confirmed visually and audibly. .

In such a scan mode, one receiver may be provided in spite of using a plurality of transmitters, so that the configuration is simplified.

The above control is performed in the scan mode. For example, in this scan mode, it may be desired to monitor the state of a specific monitoring area in detail in the monitoring room. For example, the conversation between the employee and the customer is longer than usual, or the customer's attitude is unnatural. In such a case, after the imaging apparatus 100 controls the imaging apparatus 100 so that the specific monitoring area is fixedly imaged, C
The PU 222 performs monitoring in the fixed mode as shown in FIG.

First, the frequency of the local oscillation signal of the local oscillator of the tuning unit 220 is set so as to receive the radio wave from the transmitter in the specific monitoring area (step S26).

Next, it is determined whether a noise detection signal has been generated (step S28). If a noise detection signal has not been generated, a wireless transmission path has not been established between the transmitter and the receiver, so that an abnormality detection signal is transmitted (step S30). Based on this abnormality detection signal, for example, an abnormality detection indicator (not shown) is turned on. And
Step S28 is executed again. If it is determined in step S28 that a noise detection signal has been generated, it is determined whether a carrier detection signal has been generated (step S3).
2). If the carrier detection signal has not been generated, step S30 is executed, and step S28 is executed again. If a carrier detection signal has been generated, it is determined whether a first tone detection signal has been generated (step S34). If the first tone detection signal has not been generated, step S30 is executed, and step S28 is executed again. If it is determined in step S34 that the first tone detection signal has been generated, that is, if the noise detection signal has been generated, the carrier detection signal has been generated, and the first tone detection signal has been generated,
It is determined that a transmission path is established between the designated transmitter and the tuning unit 220 via radio. Since the inspection is performed in triplicate as described above, the transmission path is reliably established when no abnormality detection signal is generated.

When it is determined in step S34 that the first tone detection signal has been generated, the CPU 222 closes the audio switch 223, supplies the audio signal from the tuning unit 220 to the speaker, and outputs the audio signal to the monitoring area. Monitor the condition based on hearing. At this time, by the imaging device 100,
Since the monitoring area is also imaged, visual monitoring is also performed at the same time.

Subsequent to step S36, it is determined whether or not the second tone detection signal has been generated (step S38).
If it is determined that no tone detection signal has been generated, step S38 is repeated. In step S38,
If it is determined that the second tone detection signal has been generated, an alarm signal is output (step S40). As a result, for example, an alarm indicator (not shown) is turned on, and an audible sound generator is activated to notify the occurrence of an emergency.

In the monitoring device of this embodiment, three types of noise detection, carrier detection and tone detection are used to determine whether a transmission path is established between a transmitter and a receiver. However, only one of them may be used. In that case, the use of tone detection enables highly accurate abnormality detection. In noise detection and carrier detection, when the reception level of jamming radio waves is high, these are detected and
There is a possibility of generating a noise detection signal or a carrier detection signal. However, since the first tone signal is not included in the jamming radio wave, even if the reception level of the jamming radio wave is large, erroneous detection does not occur when tone detection is performed.
For the same reason, the second tone signal is used as the alarm signal. Note that the same change as that made for the alarm signal in the first embodiment can be made for the second tone signal.

Although two monitoring areas are used, more monitoring areas may be used, and a transmitter, a microphone, and an operation switch may be set as one set, and each set may be provided in each monitoring area. In this case, the transmission frequency of each transmitter needs to be different. Further, although the monitoring device is implemented in connection with the imaging device, it is also possible to use only this monitoring device without using the imaging device. Although the audio signal is transmitted, the audio signal may not be transmitted, and only the second tone signal may be transmitted by operating the operation switch. Further, instead of the operation switch, for example, a sensor, for example, a photoelectric sensor for detecting a human body may be provided in a specific monitoring area, and the second tone signal may be transmitted based on a detection signal of the photoelectric sensor. .

[0062]

As described above, according to the present invention, transmission is always performed from the transmitter, and it is determined whether or not the transmitted radio wave is received by the receiver. It is possible to determine whether or not a wireless transmission path is established between the communication device and the receiver, and the reliability of the monitoring device is improved. In an emergency, a warning signal is transmitted, so that it is possible to reliably confirm that an emergency has occurred.

[Brief description of the drawings]

FIG. 1 is a block diagram of a monitoring device according to a first embodiment of the present invention.

FIG. 2 is a detailed block diagram of the transmitter of FIG. 1;

FIG. 3 is a detailed block diagram of the receiver in FIG. 1;

FIG. 4 is a detailed front view of the display device of FIG. 1;

FIG. 5 is a block diagram of a monitoring device according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a monitoring device according to a third embodiment of the present invention.

FIG. 7 is a detailed block diagram of the transmitter of FIG. 6;

FIG. 8 is a detailed block diagram of the receiver in FIG. 6;

FIG. 9 shows a CP in a scan mode in the receiver of FIG. 6;
6 is a flowchart showing the operation of U.

FIG. 10 shows a CPU in a fixed mode in the receiver of FIG. 6;
6 is a flowchart showing the operation of the first embodiment.

[Explanation of symbols]

 2 Transmitter 4 Microphone 6 Operation switch 22 Receiver 48 Display device

Continued on the front page F-term (reference) 5C084 AA02 AA07 AA12 BB40 CC16 DD01 DD32 DD77 EE01 EE10 FF02 FF27 GG07 GG09 GG24 GG71 GG74 HH02 HH03 HH12 HH13 5C087 AA02 AA02 AA03 AA11 AA32 BB04 BB04 DD FF04 FF05 FF19 FF20 GG01 GG06 GG19 GG66

Claims (5)

[Claims] A transmitting unit that transmits radio waves at all times and modulates the radio waves when an input signal is supplied; a transmitting unit that responds to a detection signal from a sensor or an operation signal by operating an operation unit; An alarm signal generation unit that supplies an alarm signal to the transmission unit; a reception unit that is arranged at a position distant from the transmission unit and receives a radio wave from the transmission unit; When the receiving unit is in the receiving state of the radio wave, and outputs a normal output, and when the receiving unit is in the receiving state of the radio wave and demodulates the alarm signal, the emergency output is output. A monitoring device comprising: 2. The monitoring device according to claim 1, wherein the transmitting unit is supplied with a tone signal as the input signal in a state where radio waves are constantly transmitted, and the determining unit determines that the receiving unit is configured to transmit the tone signal. Output the abnormal output when not demodulating, output the normal output when the receiving section demodulates the tone signal, and output the abnormal output when the receiving section demodulates the tone signal and the alarm signal. Monitoring device. 3. The monitoring device according to claim 1, wherein the transmission unit receives a first tone signal as the input signal in a state where radio waves are constantly transmitted, and the alarm signal generation unit outputs the alarm signal. The determination unit outputs the abnormal output when the receiving unit does not demodulate the first and second tone signals, and the receiving unit outputs the first tone signal.
A monitoring device that outputs the normal output when the tone signal is demodulated, and outputs the emergency output when the receiving unit demodulates the first and second tone signals. 4. The monitoring device according to claim 1, wherein one transmission unit, one alarm signal generation unit, and one sensor or operating means form one set, and a plurality of such sets are provided. Each set is arranged at a different position, the frequency of the radio wave of each of the transmitting units is set to be different, and the receiving unit is configured to be able to receive the radio wave of the different frequency, respectively, and the receiving unit is different. A monitoring device having a control unit that controls the receiving unit so as to repeatedly receive radio waves of a frequency in order. 5. The monitoring device according to claim 4, wherein different audio signals are always supplied to the respective transmission units as the input signals, and the control unit determines that the determination unit receives radio waves of the respective frequencies. In any one of the states, when the emergency output is output, the monitoring device controls the reception unit so as to maintain the reception state at the frequency.