CN109951669B - Building intercom indoor terminal and security detection method thereof - Google Patents
Building intercom indoor terminal and security detection method thereof Download PDFInfo
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- CN109951669B CN109951669B CN201910314982.4A CN201910314982A CN109951669B CN 109951669 B CN109951669 B CN 109951669B CN 201910314982 A CN201910314982 A CN 201910314982A CN 109951669 B CN109951669 B CN 109951669B
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Abstract
The invention discloses a building intercom indoor terminal which gives an alarm when an external switching value is in an abnormal state so as to realize the combination of building intercom equipment and security and protection equipment. A building intercom indoor terminal comprises a security alarm module, wherein the output end of an analog switch unit is connected with a plurality of paths of continuous switching value analog signals, and the output end of the analog switch unit is electrically connected with the input end of a double comparison circuit unit; the output end of the double comparison circuit unit is electrically connected with the processing module; the analog switch unit turns on each path of analog switch in a polling way and inputs switching value analog signals to the double comparison circuit one by one in sequence, and the double comparison circuit compares the switching value analog signals with a threshold range and provides a comparison result to the security alarm processing unit; and the security alarm processing unit sends alarm information according to the comparison result that the switching value analog signal is not in the threshold range. The invention also discloses a security detection method for the building intercom indoor terminal.
Description
Technical Field
The invention belongs to the technical field of building access control systems, and particularly relates to a building intercom indoor terminal.
Background
The building intercom is installed in buildings or building groups such as residential districts, unit buildings, office buildings and the like, and is used for identifying visitors by images and sounds, controlling door locks and realizing other auxiliary functions.
The building intercom comprises a building intercom indoor terminal (indoor unit) and a door phone. At present, chinese patent application publication No. CN103745559A, published as 2014, 04, 23, discloses a video intercom indoor terminal with security function, which can be combined with various sensors to determine the alarm situations such as fire, gas leakage, etc. However, no combination of passive switching values is possible.
Disclosure of Invention
The invention aims to provide a building intercom indoor terminal which gives an alarm when an external switching value is in an abnormal state, so that the building intercom equipment and security equipment are combined.
In order to solve the technical problems, the invention adopts the technical scheme that:
a building intercom indoor terminal comprising: a processing module for processing the received data,
the voice processing module is used for acquiring analog information during voice talkback and is in communication connection with the processing module;
the display module is used for human-computer interface interaction and is in communication connection with the processing module;
the key module is used for man-machine interface interaction and is in communication connection with the processing module;
the security alarm module is in communication connection with the processing module; the security alarm module comprises an analog switch unit, a double comparison circuit unit and a security alarm processing unit;
the output end of the analog switch unit is connected with a plurality of continuous switching value analog signals, and the output end of the analog switch unit is electrically connected with the input end of the double comparison circuit unit; the output end of the double comparison circuit unit is electrically connected with the processing module;
the analog switch unit turns on each path of analog switch in a polling way and inputs switching value analog signals to the double comparison circuit one by one in sequence, and the double comparison circuit compares the switching value analog signals with a threshold range and provides a comparison result to the security alarm processing unit; and the security alarm processing unit sends alarm information according to the comparison result that the switching value analog signal is not in the threshold range.
On the basis of the above scheme and as a preferable scheme of the scheme: when the switching value analog signal is within the threshold range, the output end of the double comparison circuit forms a high level; when the switching value analog signal exceeds the threshold value range, the output end of the double comparison circuit forms low level.
On the basis of the above scheme and as a preferable scheme of the scheme: the switching value comprises a normally-open switching value and/or a normally-closed switching value, the normally-open switching value is connected with the working voltage through a first resistor after being connected with a parallel resistor in parallel, and a switching value analog signal is collected at the low-voltage end of the first resistor; and the normally-closed switching value is connected with the working voltage through a second resistor after being connected with the series resistor in series, and the switching value analog signal is collected at the low-voltage end of the second resistor.
On the basis of the above scheme and as a preferable scheme of the scheme: the double comparison circuit comprises a double voltage comparator, wherein a first inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a first non-inverting terminal of the double voltage comparator is connected with a first fixed voltage, a second non-inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a second inverting terminal of the double voltage comparator is connected with a second fixed voltage, a first output terminal of the double voltage comparator is connected with a positive power supply through a pull-up resistor R215, a second output terminal of the double voltage comparator is connected with the positive power supply through a pull-up resistor R216, a common terminal between the first output terminal of the double voltage comparator and the pull-up resistor R215 is electrically connected with a negative electrode of a switch diode D3, a common terminal between the second output terminal of the double voltage comparator and the pull-up resistor R216 is electrically connected with a negative electrode of a switch diode D4, a positive electrode of a switch diode D3 is connected with the positive power supply through a resistor R2, and a positive electrode of the switch diode D4 is connected with the positive power supply through a pull-up resistor R2, the common terminal among the switch diode D3, the switch diode D4 and the resistor R2 is the output terminal of the double comparison circuit.
On the basis of the above scheme and as a preferable scheme of the scheme: the analog switch unit includes a chip model 74HC 4051.
The invention also discloses a multi-path security detection method for the building intercom indoor terminal, which comprises a signal acquisition step, wherein switching values of multi-path security equipment are accessed to form multi-path continuous switching value analog signals;
a signal switching step of polling and opening each path of analog switch to enable the accessed multi-path switching value analog signals to be sequentially output from the output end of the analog switch unit one by one;
a voltage comparison step, comparing the switching value analog signal with a threshold range, and outputting comparison result information;
and an information processing step of sending alarm information according to the comparison result and when the switching value analog signal is not in the threshold range.
On the basis of the above scheme and as a preferable scheme of the scheme: when the switching value analog signal is within the threshold range, the output end of the double comparison circuit forms a high level; when the switching value analog signal exceeds the threshold value range, the output end of the double comparison circuit forms low level.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that:
according to the building intercom indoor terminal, the switching value analog signals are compared with the fixed threshold range, the voltage values of the switching value analog signals are related to the corresponding switching value states, when the switching value states change, the corresponding switching value analog signals change and exceed the threshold range, and therefore the switching value states are judged to change, and accordingly an alarm is triggered.
Drawings
Fig. 1 is a circuit diagram of an analog switching cell of the present invention.
Fig. 2 is a circuit diagram of a dual compare circuit of the present invention.
Fig. 3 is a circuit schematic of the switching value input of the present invention.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step, based on the given embodiments, fall within the scope of protection of the present application.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
A building intercom indoor terminal comprising: the device comprises a processing module, a voice processing module, a display module, a key module, an analog switch unit and a double comparison circuit unit.
In one embodiment, the processing module employs an ITE9856 chip.
The voice processing module is used for acquiring the analog information during voice talkback. In an embodiment, the voice processing module unit is further configured to perform analog-to-digital and digital-to-analog conversion, and echo cancellation. The voice processing module is in communication connection with the processing module.
And the display module is used for human-computer interface interaction and is in communication connection with the processing module.
And the key module is used for man-machine interface interaction and is in communication connection with the processing module.
It should be noted that the voice processing module, the display module and the key module are all in the prior art and are commonly used in the field, and the structures thereof are not described herein again.
The security alarm module is in communication connection with the processing module.
The security alarm module comprises an analog switch unit, a double comparison circuit unit and a security alarm processing unit.
The output end of the analog switch unit is connected with a plurality of paths of continuous switching value analog signals.
In this embodiment, the switching value analog signal is associated with security equipment. The security device can be a smoke detector, a temperature detector, a combustible gas detector, a curtain type infrared detector and an entrance guard. The security equipment has a switching value. The on-state and off-state of the switching value can be obtained at the auxiliary contact of the switching value.
In one embodiment, the switching value includes a normally open switching value and/or a normally closed switching value. The normally-open switching value is connected with the parallel resistor in parallel and then is connected with the working voltage through the first resistor, and the switching value analog signal is collected at the low-voltage end of the first resistor. And the normally-closed switching value is connected with the working voltage through a second resistor after being connected with the series resistor in series, and the switching value analog signal is collected at the low-voltage end of the second resistor.
In the invention, when the switching value of the branch circuit after the normally open switching value is connected with the parallel resistor in parallel is changed from an open state to a closed state, the resistance value of the branch circuit is changed, and correspondingly, the obtained potential, namely the voltage value of the switching value analog signal is changed. Similarly, in the branch circuit in which the normally-closed switching value is connected in series with the series resistor, when the switching value is changed from the closed state to the open state, the voltage value of the off-value analog signal changes.
The output end of the analog switch unit is electrically connected with the input end of the double comparison circuit unit; the output end of the double comparison circuit unit is electrically connected with the processing module.
The analog switch unit turns on each path of analog switch in a polling way and inputs switching value analog signals to the double comparison circuit one by one in sequence, and the double comparison circuit compares the switching value analog signals with a threshold range and provides a comparison result to the security alarm processing unit; and the security alarm processing unit sends alarm information according to the comparison result that the switching value analog signal is not in the threshold range.
The alarm information is transmitted to the processing module, and the alarm information is sent to the outside through the network module after the information processing of the processing module. The alarm information receiving end can be a management machine and/or a mobile terminal.
In the invention, the switching value analog signal is compared with a fixed threshold range, and as the voltage value of the switching value analog signal is related to the state of the corresponding switching value, when the state of the switching value is changed, the corresponding switching value analog signal is changed and exceeds the threshold range, thereby judging that the state of the switching value is changed and triggering the alarm.
The analog switch unit includes a chip model 74HC 4051. It has 8 switching value inputs. Correspondingly, the first resistor branch has 8 resistors, and the first resistors are respectively R217, R218, R219, R220, R221, R222, R223 and R224. Thus, 8 switching amounts are accessed accordingly. It should be noted that in a specific application, only one or a few ways may be accessed.
The dual-comparison circuit comprises a dual-voltage comparator, the model of the dual-voltage comparator is LM393, a first inverting terminal of the dual-voltage comparator is electrically connected with an output terminal of the analog switch unit, a first non-inverting terminal of the dual-voltage comparator is connected with a first fixed voltage, a second non-inverting terminal of the dual-voltage comparator is electrically connected with an output terminal of the analog switch unit, a second inverting terminal of the dual-voltage comparator is connected with a second fixed voltage, a first output terminal of the dual-voltage comparator is connected with a positive power supply through a pull-up resistor R215, a second output terminal of the dual-voltage comparator is connected with the positive power supply through a pull-up resistor R216, a common terminal between the first output terminal of the dual-voltage comparator and the pull-up resistor R215 is electrically connected with a negative electrode of a switch diode D3, a common terminal between the second output terminal of the dual-voltage comparator and the pull-up resistor R216 is electrically connected with a negative electrode of a switch diode D4, and a positive electrode of a switch diode D3 is connected with the positive power supply through a resistor R2, the anode of the switch diode D4 is connected with the positive power supply through the pull-up resistor R2, and the common end among the switch diode D3, the switch diode D4 and the resistor R2 is the output end of the double comparison circuit. Wherein the first fixed voltage is greater than the second fixed voltage. The voltage value ranges of the first fixed voltage and the second fixed voltage are threshold value ranges. In an embodiment, after the resistor R204, the resistor R205, and the resistor R206 are connected in series, one end of the resistor R204 is connected to the +5V operating voltage, one end of the resistor R206 is grounded, a first fixed voltage is obtained at a common end between the first resistor R204 and the resistor R205, and a second fixed voltage is obtained at a common end between the first resistor R205 and the resistor R206.
When the switching value analog signal is within the threshold range, the output end of the double comparison circuit forms a high level; when the switching value analog signal exceeds the threshold value range, the output end of the double comparison circuit forms low level.
When the voltage value of the switching value analog signal is within the range of the first fixed voltage and the second fixed voltage, the first output pin of the dual-voltage comparator outputs a high level, the switching diode D3 is cut off, the second output pin of the dual-voltage comparator outputs a high level, the switching diode D4 is cut off, and the output end of the dual-voltage comparator circuit obtains a high level. When the voltage value of the switching value analog signal is greater than the first fixed voltage, the first output pin of the dual voltage comparator outputs a low level, and the second output pin of the dual voltage comparator outputs a high level, so that the switching diode D3 is turned on, and the switching diode D4 is turned off, and a low level is obtained at the output terminal of the dual comparison circuit. When the voltage value of the switching value analog signal is smaller than the second fixed voltage, correspondingly, the switching diode D3 is turned off, and the switching diode D4 is turned on, so that a low level is obtained at the output end of the double comparison circuit.
The analog switch unit turns on each path of analog switch by polling every 100ms, so that the double comparison circuit detects the state of the external security equipment, namely when the security equipment is in a normal state, the double comparison circuit outputs a high level, when the security equipment is in an abnormal state, the voltage value input into the double comparison circuit is not in a threshold range, and at the moment, the double comparison circuit outputs a low level.
The invention also discloses a multi-path security detection method for the building intercom indoor terminal, which comprises a signal acquisition step, wherein switching values of multi-path security equipment are accessed to form multi-path continuous switching value analog signals; a signal switching step of polling and opening each path of analog switch to enable the accessed multi-path switching value analog signals to be sequentially output from the output end of the analog switch unit one by one; a voltage comparison step, comparing the switching value analog signal with a threshold range, and outputting comparison result information; and an information processing step of sending alarm information according to the comparison result and when the switching value analog signal is not in the threshold range.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (3)
1. A building intercom indoor terminal comprising: a processing module for processing the received data,
the voice processing module is used for acquiring analog information during voice talkback and is in communication connection with the processing module; the display module is used for human-computer interface interaction and is in communication connection with the processing module; the key module is used for man-machine interface interaction and is in communication connection with the processing module; the system is characterized by also comprising a security alarm module, wherein the security alarm module is in communication connection with the processing module; the security alarm module comprises an analog switch unit, a double comparison circuit unit and a security alarm processing unit; the output end of the analog switch unit is connected with a plurality of continuous switching value analog signals, and the output end of the analog switch unit is electrically connected with the input end of the double comparison circuit unit; the output end of the double comparison circuit unit is electrically connected with the processing module; the analog switch unit turns on each path of analog switch in a polling way and inputs switching value analog signals to the double comparison circuit one by one in sequence, and the double comparison circuit compares the switching value analog signals with a threshold range and provides a comparison result to the security alarm processing unit; the security alarm processing unit sends alarm information according to the comparison result that the switching value analog signal is not in the threshold range; the switching value comprises a normally-open switching value and/or a normally-closed switching value, the normally-open switching value is connected with the working voltage through a first resistor after being connected with a parallel resistor in parallel, and a switching value analog signal is collected at the low-voltage end of the first resistor; the normally-closed switching value is connected with the working voltage through a second resistor after being connected with the series resistor in series, and the switching value analog signal is collected at the low-voltage end of the second resistor; when the switching value analog signal is within the threshold range, the output end of the double comparison circuit forms a high level; when the switching value analog signal exceeds the threshold range, the output end of the double comparison circuit forms a low level; the double comparison circuit comprises a double voltage comparator, wherein a first inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a first non-inverting terminal of the double voltage comparator is connected with a first fixed voltage, a second non-inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a second inverting terminal of the double voltage comparator is connected with a second fixed voltage, a first output terminal of the double voltage comparator is connected with a positive power supply through a pull-up resistor R215, a second output terminal of the double voltage comparator is connected with the positive power supply through a pull-up resistor R216, a common terminal between the first output terminal of the double voltage comparator and the pull-up resistor R215 is electrically connected with a negative electrode of a switch diode D3, a common terminal between the second output terminal of the double voltage comparator and the pull-up resistor R216 is electrically connected with a negative electrode of a switch diode D4, a positive electrode of a switch diode D3 is connected with the positive power supply through a resistor R2, and a positive electrode of the switch diode D4 is connected with the positive power supply through a pull-up resistor R2, the common terminal among the switch diode D3, the switch diode D4 and the resistor R2 is the output terminal of the double comparison circuit.
2. The building intercom indoor terminal as claimed in claim 1, wherein: the analog switch unit includes a chip model 74HC 4051.
3. A multi-channel security detection method for a building intercom indoor terminal is characterized by comprising the following steps: the method comprises a signal acquisition step, wherein switching values of multiple paths of security equipment are accessed and multiple paths of continuous switching value analog signals are formed;
a signal switching step of polling and opening each path of analog switch to enable the accessed multi-path switching value analog signals to be sequentially output from the output end of the analog switch unit one by one; a voltage comparison step, comparing the switching value analog signal with a threshold range, and outputting comparison result information; an information processing step, namely sending alarm information according to the comparison result when the switching value analog signal is not in the threshold range;
the switching value comprises a normally-open switching value and/or a normally-closed switching value, the normally-open switching value is connected with the working voltage through a first resistor after being connected with a parallel resistor in parallel, and a switching value analog signal is collected at the low-voltage end of the first resistor; the normally-closed switching value is connected with the working voltage through a second resistor after being connected with the series resistor in series, and the switching value analog signal is collected at the low-voltage end of the second resistor; when the switching value analog signal is within the threshold range, the output end of the double comparison circuit forms a high level; when the switching value analog signal exceeds the threshold range, the output end of the double comparison circuit forms a low level;
the voltage comparison step adopts a double comparison circuit, the double comparison circuit comprises a double voltage comparator, a first inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a first non-inverting terminal of the double voltage comparator is connected with a first fixed voltage, a second non-inverting terminal of the double voltage comparator is electrically connected with an output terminal of the analog switch unit, a second inverting terminal of the double voltage comparator is connected with a second fixed voltage, a first output terminal of the double voltage comparator is connected with a positive power supply through a pull-up resistor R215, a second output terminal of the double voltage comparator is connected with the positive power supply through a pull-up resistor R216, a common terminal between the first output terminal of the double voltage comparator and the pull-up resistor R215 is electrically connected with a negative electrode of a switch diode D3, a common terminal between the second output terminal of the double voltage comparator and the pull-up resistor R216 is electrically connected with a negative electrode of a switch diode D4, and a positive electrode of a switch diode D3 is connected with the positive power supply through a resistor R2, the anode of the switch diode D4 is connected with the positive power supply through the pull-up resistor R2, and the common end among the switch diode D3, the switch diode D4 and the resistor R2 is the output end of the double comparison circuit.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1979000087A1 (en) * | 1977-08-05 | 1979-02-22 | L Wern | Touch control switch |
| GB2165651A (en) * | 1984-09-24 | 1986-04-16 | Electromatic | Inductive loop detector |
| DE4220460A1 (en) * | 1992-06-23 | 1994-01-05 | Sel Alcatel Ag | Mains AC-powered load protection appts. against unauthorised removal of household power tool - exploits sensitivity of transformer-coupled circuit to residual current through 150-nanofarad interference suppression capacitor, when tool is switched off yet plugged in using active rectifier, comparator and relay. |
| CN205019039U (en) * | 2015-08-18 | 2016-02-10 | 北京理工大学珠海学院 | Multi -functional electronic monitor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474953B (en) * | 2013-09-11 | 2016-01-20 | 张成虎 | Single-phase line voltage controller |
| CN105449994B (en) * | 2014-09-10 | 2017-09-29 | 立锜科技股份有限公司 | The control circuit of power supply changeover device |
| CN206162235U (en) * | 2016-11-07 | 2017-05-10 | 郑州华力信息技术有限公司 | Electric current adjustable constant current source is used in electric power control |
| CN206629188U (en) * | 2017-02-21 | 2017-11-10 | 珠海三润电子有限公司 | A kind of door phones of building with security alarm |
-
2019
- 2019-04-18 CN CN201910314982.4A patent/CN109951669B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1979000087A1 (en) * | 1977-08-05 | 1979-02-22 | L Wern | Touch control switch |
| GB2165651A (en) * | 1984-09-24 | 1986-04-16 | Electromatic | Inductive loop detector |
| DE4220460A1 (en) * | 1992-06-23 | 1994-01-05 | Sel Alcatel Ag | Mains AC-powered load protection appts. against unauthorised removal of household power tool - exploits sensitivity of transformer-coupled circuit to residual current through 150-nanofarad interference suppression capacitor, when tool is switched off yet plugged in using active rectifier, comparator and relay. |
| CN205019039U (en) * | 2015-08-18 | 2016-02-10 | 北京理工大学珠海学院 | Multi -functional electronic monitor |
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