JPH04357597A - Wireless burglar preventing device - Google Patents

Abstract

PURPOSE:To avoid erroneous and missing reports on a receiving side by providing a receiver with a comparison means which compares analog data with a burglar prevention discriminating level, a burglar prevention sensitivity controlling means and an analog data confirming means. CONSTITUTION:As for a receiver 30, a reception antenna 31 receives a radio wave B and a demodulation circuit 32 demodulates the radio wave B for outputting it as a digital signal, and a digital processor (comparison means) 33 receives the output from the demodulation circuit for digital processing so as to recognize which hot wire type detector has detected a burglar, etc. An alarm reporting part (an analog data confirming means) 34 receives the output from the digital processor 33 to report by alarming which hot wire type detector has detected a burglar, etc., and a storing circuit 35 stores a comparison value corresponding to a burglar prevention discriminating level. An operational part (the burglar prevention sensitivity controlling means) 36 variably sets the comparison value stored in the storing circuit 35 to instruct the digital processor 33 to display and print the comparison value and analog data by way of a display and a printer of the alarm reporting part 34.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless security device capable of adjusting the security sensitivity using a receiver and confirming the level of a physical security quantity detected by a detector.

0002

2. Description of the Related Art FIG. 7 is a block diagram showing a hot wire detector 20 corresponding to a detector of a conventional wireless security device, and FIG. 8 is a block diagram showing a receiver 30 of a conventional wireless security device. be.

As shown in FIG. 7, the hot wire detector 20 has the following features:
A pyroelectric element 21 that detects heat rays A emitted by a human body corresponding to a physical quantity for crime prevention and outputs a weak voltage corresponding to the amount of heat rays A, an amplifier 22 that amplifies the weak voltage, and an output from the amplifier 22 that is used for crime prevention. A comparison circuit 23 that outputs High if it is above the determination level, and a digital processing unit 24 that receives the High output of the comparison circuit 23 and outputs 32-bit transmission data.
, a transmission drive circuit 25 that modulates the transmission data and outputs it as a radio wave B, and a transmission antenna 26 that radiates the radio wave B.

[0004] The 32-bit transmission data is composed of several bits of address data for identifying which hot wire detector 20 has detected the object, and 1-bit of security detection data. The hot wire detector 20 also includes an amplifier 22.
A sensitivity setting switch (not shown) or a sensitivity setting volume (not shown) is provided so that the crime prevention detection sensitivity can be adjusted and set by varying the amplification factor of the comparison circuit 23 or the crime prevention judgment level of the comparator circuit 23. ing.

As shown in FIG. 8, the receiver 30 receives radio waves B.
a receiving antenna 31 that receives the radio wave B, a demodulation circuit 32 that demodulates the radio wave B and outputs it as a digital signal, and digitally processes the output of the demodulation circuit 32 to recognize which hot wire detector 20 has detected the crime prevention. A digital processing section 33;
Alarm notification unit (consisting of an alarm buzzer, display, and printer) 3 that receives the output of the digital processing unit 33 and issues an alarm as to which hot wire detector 20 has detected the crime prevention.
It is equipped with 4th class. The display and printer are also configured to display and print the date, hour, minute, and second of the crime prevention detection.

[0006] Therefore, a wireless security device equipped with the hot wire detector 20 and the receiver 30 can issue a crime prevention alarm against an intruder, and also make it possible to know when and where an intruder is present.

By the way, the heat ray detector 20 has a detection range for intruders that emit heat rays A, and must be installed on the ceiling or wall at an appropriate distance and direction from the desired crime prevention position. be. Therefore, after installing the heat-ray detector 20, we test whether the heat-ray detector 20 has been installed properly by having people pass through a targeted crime prevention position and using a wireless security device to issue an alarm. A detection range adjustment check (referred to as a walk test) is performed to confirm that notifications can be made.

[0008]

[Problems to be Solved by the Invention] However, in the conventional wireless security device, although the hot ray detector 20 transmits information that the security has been detected to the receiver 30, this transmitted data is based on the amount of hot rays A. There were only the crime prevention detection data indicating that the detection level exceeded the crime prevention determination level of the comparator circuit 23, and the address data for identifying which hot wire detector 20 sent the data. Therefore, it is unclear at what input level of the hot ray A the hot ray detector 20 detects the crime, and even if the wireless security device issues an alarm as a result of the walk test, it is unclear whether it detected the crime with a margin. , due to lack of security detection sensitivity, it is difficult to know whether security has been detected, and there is no false alarm (the crime is detected even though there is no intruder) or false alarm (the crime is not detected even though there is an intruder). There was a problem in that there remained concerns as to whether the hot-wire detector 20 had been installed or whether the security detection sensitivity settings of the hot-wire detector 20 had been adjusted so as to achieve a security detection sensitivity of .

Furthermore, if it is necessary to adjust the security detection sensitivity based on the result of the walk test, the hot wire detector 2
There was a problem in that it was necessary to go to the location where the hot wire detector 20 was installed and adjust the setting of the security detection sensitivity of the hot wire detector 20.

The present invention has been made in order to improve the above-mentioned problems, and its purpose is to be able to appropriately adjust the crime prevention detection sensitivity so as to prevent false alarms and missed alarms, and to improve the crime prevention detection sensitivity. The purpose of the present invention is to provide a wireless security device in which adjustment settings can be easily made on the receiver side.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a detector that detects a crime prevention physical quantity and transmits address data and analog data of the crime prevention physical quantity, and address data transmitted by the detector. and a receiver that receives the analog data and issues a crime prevention alarm by notifying which detector has detected the crime prevention. The present invention is characterized in that it includes a comparison means for comparison, a crime prevention sensitivity adjustment means for variably setting the crime prevention determination level, and the analog data confirmation means.

0012

[Operation] By configuring as above, the detector can:
Because analog data of crime prevention physical quantities is sent to the receiver,
The receiver that receives the analog data of the crime prevention physical quantity can compare the crime prevention determination level that can be variably set by the crime prevention sensitivity adjustment means with the analog data of the crime prevention physical quantity, and also allows the receiver to compare the analog data of the crime prevention physical quantity. You can also check it.

[0013]

Embodiment FIGS. 1 to 6 show an embodiment of the wireless security device according to the present invention, in which FIG. 1 is a block diagram of the main parts of the detector, FIGS. 2 and 3 are circuit diagrams of the main parts of the amplifier, FIG. 4 is an explanatory diagram for explaining the output of the amplifier, FIG. 5 is an explanatory diagram for explaining the output of the analog/digital conversion circuit, and FIG. 6 is a block diagram of the main part of the receiver.

As shown in FIG. 1, a heat ray detector 20, which corresponds to a detector, detects heat rays A emitted by the human body, which corresponds to a security physical quantity, and outputs a weak voltage vi corresponding to the amount of heat rays A. A pyroelectric element 21, an amplifier 22 that amplifies the weak voltage vi and outputs an analog voltage va that can be input to the analog/digital conversion circuit 23, and an analog/digital conversion circuit 23 that converts the output from the amplifier 22 from analog to digital. , a digital processing section 24 that receives the output of the analog/digital conversion circuit 23 and outputs 32-bit transmission data, a transmission drive circuit 25 that modulates this transmission data and outputs it as radio wave B, and radio wave B.
It is equipped with a transmitting antenna 26 etc. that radiates.

[0015] The 32-bit transmission data includes several bits of address data for identifying which hot-ray detector 20 has detected the object, and analog data corresponding to the amount of hot-ray A corresponding to a 3-bit crime prevention physical quantity. It is composed of etc. Further, the analog/digital conversion circuit 23 of the hot wire detector 20 samples the analog voltage va corresponding to the amount of the hot wire A from the amplifier 22 using the sampling clock signal C, and converts it into a 3-bit binary coded decimal number. Data input ports D1 and D2 of the converted digital processing unit 24
,D3 (D1 is the upper bit, D3 is the lower bit)
Output to. Further, the 3-bit output of the analog/digital conversion circuit 23 is also output to the NOR circuit 27, and the output of the NOR circuit 27 is input to the trigger input port T of the digital processing section 24.

By the way, the amplifier 22 is composed of an absolute value amplification circuit and a differential amplification circuit for converting the weak voltage vi, which is the output from the pyroelectric element 21, into an analog voltage va that can be input to the analog/digital conversion circuit 23. has been done. A main circuit diagram showing this absolute value amplification circuit is shown in FIG.
FIG. 3 is a circuit diagram of the main parts of the differential amplifier circuit.

First, the connection relationship of the absolute value amplification circuit shown in FIG. 2 will be explained. Vi is an input terminal of an absolute value amplification circuit into which a weak voltage vi which is an output from the pyroelectric element 21 is input, and the input terminal Vi is connected to one side of a capacitor C1, and the other side of the capacitor C1 is connected to a resistor R1 and a resistor R3.
are connected to each other on one side. The other end of the resistor R1 is connected to the inverting input terminal of the operational amplifier 22a, one end of the resistor R2, and the cathode of the diode D2. The other side of the resistor R2 is connected to one side of the resistor R4 and the anode of the diode D1.
The cathode of the diode D2 and the anode of the diode D2 are respectively connected to the output of the operational amplifier 22a.

The other side of resistor R4 is connected to capacitor C2.
The other end of the capacitor C2 is connected to the inverting input terminal of the operational amplifier 22b. Furthermore, the other resistor R3 and one of the resistors R5 are connected to the inverting input terminal of the operational amplifier 22b, and the other resistor R5 is connected to the output of the operational amplifier 22b to form the output terminal Vo of the absolute value amplification circuit. And operational amplifier 22
A voltage Vcc/2, which is half the power supply voltage Vcc of the operational amplifier 22a and the operational amplifier 22b, is input to the non-inverting input terminals of the operational amplifier 22a and the operational amplifier 22b, respectively.

Next, the connection relationship of the differential amplifier circuit shown in FIG. 3 will be explained. Vo shown in FIG. 3 is the input terminal of the differential amplifier circuit, and Vo shown in FIG. 2 is the output terminal of the absolute value amplifier circuit.
is connected to. Then, the input terminal V of the differential amplifier circuit
o is connected to one side of resistor R8, and the other side of resistor R8 is connected to the non-inverting input terminal of operational amplifier 22c and resistor R9.
The other end of the resistor R9 is grounded. Furthermore, one of the resistors R6 and one of the resistors R7 is connected to the inverting input terminal of the operational amplifier 22c, and the other of the resistors R7 is connected to the output of the operational amplifier 22c, forming an output terminal Va of the differential amplifier circuit. . A voltage Vcc/2, which is half of the power supply voltage Vcc of the operational amplifier 22c, is input to the other resistor R6.

In addition, in the absolute value amplification circuit shown in FIG. 2, if the values of the resistors R1, R2, R3, and R4 are respectively r1, r2, r3, and r4, the resistors are adjusted so that equation (1) holds true. In the differential amplifier circuit shown in FIG. 3, the values of the resistors R6, R7, R8, and R9 are set as r6, r7, r8, and r9, respectively, (2)
The resistance value is set so that the formula holds true.

[0021] r2 / (r1 r4 ) = 2/r3 ………………………
(1) r6 = r8, r7 = r9...
......(2) Next, the operation of the absolute value amplifier circuit shown in FIG. 2 and the differential amplifier circuit shown in FIG. 3 will be explained using the amplifier 2 shown in FIG.
2 will be explained using explanatory diagrams for explaining the outputs of each section.

FIG. 4A shows a voltage waveform showing the weak voltage vi output from the pyroelectric element 21, and FIG. 4B shows the output voltage v of the output terminal Vo of the absolute value amplification circuit shown in FIG.
(C) of FIG. 4 is a voltage waveform showing the output voltage va of the differential amplifier circuit shown in FIG. 2. Note that the vertical direction indicates the potential axis, and the horizontal direction indicates the time axis, Vcc indicates a power supply potential, Vcc/2 indicates a potential half of the power supply potential, and GND indicates a ground potential.

Due to its characteristics, the pyroelectric element 21 detects when a human body, which emits heat rays A corresponding to the security physical quantity, passes through the intruder detection range of the heat ray detector 20 (which can also be called the detection range of the pyroelectric element 21). A weak voltage vi shown in FIG. 4(A) is output. In other words, the weak voltage vi exhibits a voltage waveform whose amplitude is based on the potential Vcc/2. This is because the pyroelectric element 21 detects changes in the amount of heat rays A. As a security detector, the maximum value vi (MAX) of the weak voltage vi and the minimum value vi (MI
It is more reliable to detect an intruder using N).

Therefore, with a smaller number of bits, information on the maximum value vi (MAX) of the weak voltage vi and the minimum value vi (MIN) of the weak voltage vi can be converted into the hot wire A corresponding to the crime prevention physical quantity in the analog/digital conversion circuit 23. Inside the amplifier 22, the weak voltage vi shown in FIG. 4(A) is converted into analog data according to the amount of data by the absolute value amplification circuit shown in FIG. Potential Vc
The output voltage vo is obtained by inverting the weak voltage vi of c/2 or less with respect to the potential Vcc/2, and the output voltage vo of the absolute value amplification circuit is set as the output voltage of the absolute value amplification circuit by the differential amplification circuit shown in FIG. The output voltage va of the differential amplifier circuit as shown in FIG. 4C is obtained by subtracting the potential Vcc/2 from vo (shifted to the ground potential by the potential Vcc/2).

That is, in the absolute value amplification circuit shown in FIG.
A weak voltage vi is input to the input terminal Vi and the connection point P1
When the potential at the connection point P2 becomes higher than the potential at the connection point P2, the diode D1 is turned on and the diode D2 is turned off. Therefore, in this case, if the output voltage of the connection point P3 is vP3, equations (3) and (4) hold true.

vP3=-(r2/r1)vi...
…………………………………(3) vo
=-(r5/r3)vi-(r5/r4)v
P3 ......(4) By substituting equation (3) into equation (4), equation (5) is established.

vo =-(r5/r3)vi-(
r5 /r4 ) {-(r2 /r1 )vi }
=-r5 vi (1/r3-r2
/r1 r4 ) ......(5) By substituting equation (1) into equation (5), equation (6) is established.

vo = -r5 vi (1/r3 -2
/r3) = (r5/r3)
vi ……………………………………………(6) Also, a weak voltage vi is input to the input terminal Vi and the connection point P
When the potential at node P2 becomes lower than the potential at connection point P2, diode D1 is turned off and diode D2 is turned on. Therefore, in this case, if the output voltage of the connection point P3 is vP3, equations (7) and (8) hold true.

[0029] vP3=0 ………………………
…………………………………(7) vo =
-(r5/r3)(-vi)-(r5/r4
)vP3...(8) By substituting equation (8) into equation (7), equation (9) is established.

[0030] vo = (r5 /r3)vi...
…………………………………(9) However, (3) ~ (
vi, vP3, and vo in formula 9) all represent changes.

Since a bias voltage of potential Vcc/2 is input to the non-inverting input terminal of the operational amplifier 22b, the output voltage vo of the absolute value amplification circuit including the DC component
Even if a weak voltage vi is input to the input terminal Vi and the potential of the connection point P1 is higher than the potential of the connection point P2,
A weak voltage vi is input to the input terminal Vi and the connection point P1
Even if the potential at the connection point P2 is lower than the potential at the connection point P2, the output voltage vo of the absolute value amplification circuit is expressed by equation (10).

vo = (r5 /r3)vi +Vc
c/2 ………………………(10) This (1
0) The output voltage vo of the absolute value amplification circuit shown by the formula is
It is input to the input terminal Vo of the differential amplifier circuit shown in FIG.
In this differential amplifier circuit, the relationship expressed by equation (2) exists, and the potential Vcc/2 is applied to one side of the resistor R6, so the output terminal Va of the differential amplifier circuit has the output voltage shown in equation (11). va, that is, the output voltage v of the absolute value amplification circuit
The potential Vcc/2 from o is shifted to the ground potential, and an output voltage va which is this shifted voltage multiplied by r7/r6 is output.

va = (r5 r7 /r3 r6)
vi ……………………………(11) And,
This output voltage va is the analog/digital conversion circuit 2
3. This completes the explanation of the operations of the absolute value amplifier circuit shown in FIG. 2 and the differential amplifier circuit shown in FIG. 3.

Next, the state of analog/digital conversion and the operating state of the digital processing section 24 will be explained using an explanatory diagram for explaining the output of the analog/digital conversion circuit 23 shown in FIG. va shown in FIG. 5 indicates the output voltage va of the output terminal Va of the differential amplifier circuit shown in FIG. Further, V1, V2, and V3 are reference voltages for quantizing the input voltage of the analog/digital conversion circuit 23, respectively, and D1, D2, and D3 each indicate the output bit of the analog/digital conversion circuit 23, and D1 is the upper one. Bit D3 is the lower bit.

[0035] Then, the analog/digital conversion circuit 23
The input-output relationship is as follows. In other words, if the input voltage is less than the quantization reference voltage V1, the output bit D
1, D2, D3 are output as a binary coded decimal number, and if the input voltage is greater than or equal to the quantization reference voltage V1 but less than V2, the value of "1" is output as a binary coded decimal number in the output bits D1, D2, and D3. It is output as a decimal number, and if the input voltage is greater than or equal to the quantization reference voltage V2 and less than V3, the output bits D1, D2,
The value "2" is output as a binary coded decimal number to D3, and when the input voltage is higher than the quantization reference voltage V3, the output bit D
The value ``3'' is output as a binary coded decimal number to 1, D2, and D3.

In the explanatory diagram shown in FIG. 5, the sampling period of the analog/digital conversion circuit 23 is coarse, but in reality sampling is performed at high speed, so that the maximum value Va (MAX ) can be picked up. Then, the binary conversion 10 of output bits D1, D2, D3 which are sequentially converted from analog to digital.
The value of the decimal number is input to the data input port D of the digital processing section 24.
1, D2, and D3 (D1 is the upper bit, D3 is the lower bit) and is also output to the NOR circuit 27.

Therefore, if the binary coded decimal value of the output bits D1, D2, D3 is other than "0", the NOR circuit 2
The output of the NOR circuit 27 sets the trigger input port T of the digital processing section 24 to Low, and when the binary coded decimal value of the output bits D1, D2, and D3 is "0", the output of the NOR circuit 27 sets the trigger input port T of the digital processing section 24 low. Set input port T to High.

Then, when the trigger input port T is High, the digital processing section 24 inputs the data input ports D1,
The values of D2 and D3 are ignored. However, for a certain period of time Tt including this point in time when the trigger input port T becomes Low.
Digital processing is performed to select the maximum value of the binary coded decimal numbers input to the data input ports D1, D2, and D3 within a few seconds (in the case of Fig. 5, D1 = 0).
, D2 = 1, D3 = 1) and the address of the hot wire detector 20 as a predetermined 32-bit transmission data format, the transmission drive circuit 25 modulates the transmission data and transmits the radio wave B. It is output to the transmitting antenna 26 so that it can be output as
emits radio wave B. Then, the digital processing section 24
It monitors and waits for the trigger input port T to become Low again.

Therefore, as described above, the binary coded decimal values input to the data input ports D1, D2, and D3 within a certain period of time (several seconds) Tt including this point in time when the trigger input port T becomes Low. Since only the maximum value is selected and outputted as radio wave B, there is no need to constantly output radio wave B from the transmitting antenna 26, and the power required for transmitting radio wave B can be reduced. Furthermore, the hot wire detector 20 having a specific address will no longer monopolize the radio wave B.

The receiver 30 shown in FIG. 6 includes a receiving antenna 31 that receives the radio wave B, a demodulation circuit 32 that demodulates the radio wave B and outputs it as a digital signal, and receives the output of the demodulation circuit 32 and processes it digitally. a digital processing unit 33 that recognizes whether the hot-wire type detector 20 has detected the crime prevention, and an alarm notification unit ( (consisting of an alarm buzzer, display, and printer) 34;
A memory circuit 3 that stores a comparison value corresponding to a crime prevention determination level.
5, and an operation unit capable of variably setting the comparison value stored in the storage circuit 35 and instructing the digital processing unit 33 to display/print the comparison value and the analog data on the display or printer of the alarm notification unit 34. It is equipped with 36.

Therefore, the receiver 30 receives the radio wave B with the receiving antenna 31, and converts it into a 32-bit digital signal in a predetermined format in the demodulation circuit 32 with the digital processing unit 33.
Output to. The digital processing unit 33 recognizes an address from a 32-bit predetermined format digital signal,
The comparison value of this address is selected and taken out from the storage circuit 35, and this comparison value and the maximum value within a certain time Tt corresponding to the analog data included in the 32-bit predetermined format digital signal (in the case of FIG. 5, D1 =0,D
2 = 1, D3 = 1), the maximum value within a certain time Tt corresponding to analog data (D1 = 0, D2 = 1, D3 = 1 in the case of Fig. 5) is the comparison value. If the above is the case, the comparison value, the analog data, the address, and the date, hour, minute, and second of the crime prevention detection are displayed and printed on the display or printer of the alarm notification unit 34.

Therefore, in the receiver 30, the digital processing section 33 corresponds to the comparison means, the operation section 36 corresponds to the crime prevention sensitivity adjustment means, and the display or printer of the alarm notification section 34 corresponds to the analog data confirmation means. It will be equivalent.

Therefore, in the walk test, the hot wire detector 2
When the wireless crime prevention device comprising 0 and the receiver 30 generates a crime prevention alarm, analog data of the crime prevention physical quantity detected by the hot wire detector 20 from the display of the alarm notification unit 34 or the display/print of the printer and the storage circuit 35 are generated. You can know the comparative value of. In other words, appropriate crime prevention detection without false alarms (the crime is detected even though there is no intruder) or false alarms (the crime is not detected even though there is an intruder) due to insufficient security detection sensitivity or excessive security detection sensitivity. This allows you to know whether the sensitivity is high or not.

Therefore, if the crime prevention detection sensitivity is insufficient or the crime prevention detection sensitivity is excessive, it is only necessary to designate an address from the operation section 36 of the receiver 30 and variably set the comparison value in the storage circuit 35.

[0045]

[Effects of the Invention] Since the wireless crime prevention device of the present invention is configured as described above, it is possible to appropriately adjust the crime prevention detection sensitivity so as to avoid false alarms and missed alarms, and the adjustment setting of this crime prevention detection sensitivity can also be performed. This has the effect of providing a wireless security device that can be easily implemented on the receiver side.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts showing a detector of a wireless security device according to an embodiment of the present invention.

FIG. 2 is a main part circuit diagram showing an absolute value amplification circuit of a detector of a wireless security device according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a main part of a differential amplifier circuit of a detector of a wireless security device according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an output voltage waveform for explaining the operation of an amplifier of a detector of a wireless security device according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram for explaining the output of an analog/digital conversion circuit of a detector of a wireless security device according to an embodiment of the present invention.

FIG. 6 is a block diagram of main parts showing a receiver of a wireless security device according to an embodiment of the present invention.

FIG. 7 is a block diagram of main parts showing a detector of a conventional wireless security device.

FIG. 8 is a block diagram showing a main part of a receiver of a conventional wireless security device.

[Explanation of symbols]

20 Detector 30 Receiver 33 Comparison means 34 Analog data confirmation means 36 Crime prevention sensitivity adjustment means A Crime prevention physical quantity

Claims (1)

[Claims] [Claim 1] A detector that detects a crime prevention physical quantity and transmits address data and analog data of the crime prevention physical quantity;
A wireless crime prevention device comprising a receiver that receives address data and analog data transmitted by the detectors and issues a crime prevention alarm by notifying which detector has detected the crime prevention, the receiver having the above-mentioned A wireless crime prevention device comprising: a comparison means for comparing analog data with a crime prevention determination level, a crime prevention sensitivity adjustment means for variably setting the crime prevention determination level, and the analog data confirmation means.