CN113763657A - Monitoring alarm device, monitoring alarm control method and monitoring system - Google Patents
Monitoring alarm device, monitoring alarm control method and monitoring system Download PDFInfo
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- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
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- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
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Abstract
The invention discloses a monitoring alarm device, a monitoring alarm control method and a monitoring system, wherein the device comprises: the sound source type detection device comprises a main sound collection unit, an auxiliary sound collection unit, a sound source direction identification unit, a sound source type identification unit, a trigger unit and an alarm unit, wherein the main sound collection unit collects sound waves and outputs a first sampling signal, and the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal; the sound source direction identification unit is used for comparing the first sampling signal with the second sampling signal and outputting a sound source direction identification signal according to a comparison result; the sound source type identification unit is used for filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result; the triggering unit is used for controlling the alarm unit to work according to the sound source position identification signal and the sound source type identification signal.
Description
Technical Field
The embodiment of the invention relates to the technical field of security monitoring and alarming, in particular to a monitoring and alarming device, a monitoring and alarming control method and a monitoring system.
Background
Along with economic development and social progress, the security consciousness of people is gradually improved, the monitoring alarm system is widely applied to multiple fields, and the monitoring alarm system is used for monitoring sound, image data and the like of a monitoring alarm area in real time, judging whether intrusion abnormality occurs or not and sending an alarm signal when the intrusion abnormality occurs.
The monitoring alarm system mainly includes the monitoring alarm system based on automatic control technology and image recognition technology and the monitoring alarm system based on pure hardware module at present, wherein, in the intelligent monitoring alarm system based on automatic control technology and image recognition technology, adopt image sensor to gather the image information in monitoring alarm area, adopt the image recognition algorithm to carry out image analysis, judge whether monitoring alarm area appears unusually, the controller controls drive circuit drive alarm unit and sends alarm signal when judging that monitoring alarm area appears unusually, it has following shortcoming, the degree of dependence of this system to software algorithm is high, it is high to the performance requirement of controller, and need occupy independent expansion interface and realize alarm control, use cost is high.
In the monitoring alarm system based on pure hardware module, adopt sound sensor to gather the sound signal of monitoring alarm area, send alarm signal when sound signal's intensity is greater than and predetermines the threshold value, its shortcoming that exists is, can't discern sound signal's position and sound type, and the misstatement rate is high, and user experience is relatively poor.
Disclosure of Invention
The invention provides a monitoring alarm device, which solves the problems that the existing monitoring alarm system has high requirements on software algorithm and controller performance and high false alarm rate of a hardware module, does not depend on the software algorithm and controller resources, and reduces the use cost and the false alarm rate.
In a first aspect, an embodiment of the present invention provides a monitoring alarm device, including: a main sound collection unit, an auxiliary sound collection unit, a sound source direction identification unit, a sound source type identification unit, a trigger unit and an alarm unit,
the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, and the main sound collection unit and the auxiliary sound collection unit are arranged around the main monitoring device;
the sound source direction identification unit is used for comparing the first sampling signal with the second sampling signal and outputting a sound source direction identification signal according to a comparison result;
the sound source type identification unit is used for filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result;
the triggering unit is used for controlling the alarm unit to work according to the sound source position identification signal and the sound source type identification signal.
In a second aspect, an embodiment of the present invention further provides a monitoring system, including the monitoring alarm apparatus.
In a third aspect, an embodiment of the present invention further provides a monitoring alarm control method, including the following steps: acquiring a first sampling signal and a second sampling signal around a main monitoring device; comparing the first sampling signal with the second sampling signal, and outputting a sound source position identification signal according to a comparison result; filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result; and triggering an alarm according to the sound source position identification signal and the sound source type identification signal.
The monitoring system provided by the embodiment of the invention is provided with a monitoring alarm device, the monitoring alarm device forms a main collection area of a main sound collection unit through a main sound collection unit and an auxiliary sound collection unit which are arranged around the main monitoring device, the main collection area of the main sound collection unit is superposed with a monitoring alarm area of the main monitoring device, the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, a sound source direction identification unit is adopted to determine the sound source direction according to the sizes of the first sampling signal and the second sampling signal, a sound source type identification unit is adopted to filter the first sampling signal, the sound source type is determined according to the size of a filtered third sampling signal, and whether an alarm unit works or not is controlled through the sound source direction and the sound source type, so that independent monitoring alarm is realized through a pure hardware structure, the method has the advantages that the controller expansion interface is not occupied, excessive dependence on software algorithms and controller resources is avoided, the problems that the existing monitoring alarm system is high in requirements on the software algorithms and the controller performance and high in false alarm rate of hardware modules are solved, the use cost is reduced, the alarm triggering reliability is improved, and the false alarm rate is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a monitoring alarm device according to an embodiment of the present invention;
FIG. 2 is a schematic view of an installation structure of a monitoring alarm device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another monitoring alarm apparatus provided in accordance with an embodiment of the present invention;
FIG. 4 is a circuit schematic of a timing circuit provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a monitoring system according to an embodiment of the present invention;
fig. 6 is a flowchart of a monitoring alarm control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a monitoring alarm device according to an embodiment of the present invention, which is applicable to an application scenario where an extended interface of a low-cost alarm system controller is insufficient and an alarm is triggered by a sound signal, so that an independent alarm can be achieved through a hardware structure, which is beneficial to reducing the use cost, improving the alarm triggering reliability, and reducing the false alarm rate.
As shown in fig. 1, the monitoring alarm apparatus 01 includes: the sound source monitoring device comprises a main sound collection unit 20, an auxiliary sound collection unit 30, a sound source position identification unit 40, a sound source type identification unit 50, a trigger unit 60 and an alarm unit 70, wherein the main sound collection unit 20 and the auxiliary sound collection unit 30 are arranged around a main monitoring device 10 to form a main collection area of the main sound collection unit 20, and the main collection area is located in a monitoring alarm area of the main monitoring device 10, for example, the main collection area can be overlapped with the monitoring alarm area of the main monitoring device 10 or located in the monitoring alarm area of the main monitoring device 10. The main sound collection unit 20 collects sound waves and outputs a first sampling signal, and the auxiliary sound collection unit 30 collects sound waves and outputs a second sampling signal; the input end of the sound source direction identifying unit 40 is respectively connected with the main sound collecting unit 20 and each auxiliary sound collecting unit 30, and the sound source direction identifying unit 40 is used for comparing the first sampling signal with each second sampling signal and outputting a sound source direction identifying signal; the input end of the sound source type identification unit 50 is connected with the main sound collection unit 20, and the sound source type identification unit 50 compares the first sampling signal with a preset threshold value and outputs a sound source type identification signal; the input end of the trigger unit 60 is connected to the output end of the sound source direction identifying unit 40 and the output end of the sound source type identifying unit 50, respectively, the output end of the trigger unit 60 is connected to the control end of the alarm unit 70, and the trigger unit 60 is used for driving the alarm unit 70 to operate according to the sound source direction identifying signal and the sound source type identifying signal.
In this embodiment, the main sound collection unit 20 and the auxiliary sound collection unit 30 may adopt sound sensors of the same type, the main sound collection unit 20 and the at least two auxiliary sound collection units 30 are disposed around the main monitoring device 10 to collect sound waves around the main monitoring device 10, and for the same sound source, if the distance between the sound source and the main sound collection unit 20 is smaller than the distance between the sound source and the auxiliary sound collection units 30, the intensity of the first sampling signal is greater than the intensity of the second sampling signal; conversely, the intensity of the first sampling signal is smaller than that of the second sampling signal, and accordingly, the region where the intensity of the first sampling signal is greater than that of the second sampling signal is defined as the main collection region of the main sound collection unit 20, that is, if the sound source is located in the main collection region of the main sound collection unit 20, the intensity of the first sampling signal output by the main sound collection unit 20 is greater than that of the second sampling signal output by the auxiliary sound collection unit 30.
In the present embodiment, by adjusting the relative positions of the main sound collection unit 20 and the at least two auxiliary sound collection units 30, the main collection area of the main sound collection unit 20 coincides with the monitoring alarm area of the main monitoring device 10, and further, the relative positions of the main sound collection unit 20 and the at least two auxiliary sound collection units 30 with respect to the main monitoring device 10 are kept unchanged, for example, the main sound collection unit 20 and the at least two auxiliary sound collection units 30 with respect to the main monitoring device 10 may be supported and fixed spatially by a bracket or a connecting rod, if the main monitoring device 10 is rotatable, the monitoring alarm area of the main monitoring device 10 rotates along with the main monitoring device 10, and at this time, the relative position relationship between the main sound collection unit 20 and the at least two auxiliary sound collection units 30 with respect to the main monitoring device 10 is kept unchanged, the main collection area of the main sound collection unit 20 is located in the monitoring alarm area with respect to the main monitoring device 10, and the relative positions of the main sound collection unit 20 and the at least two auxiliary sound collection units 30 are adjustable, the monitoring alarm device 01 can be used with main monitoring devices 10 with different focal lengths and different field angles, and application scenes are expanded.
In this embodiment, the main sound collection unit 20 collects sound waves in real time, converts the sound waves into electrical signals, and outputs a first sampling signal, which is an analog signal; the auxiliary sound collection unit 30 collects sound waves in real time, converts the sound waves into an electrical signal, and outputs a second sampling signal, which is an analog signal. The sound source direction identification unit 40 receives the first sampling signal and the second sampling signal, amplifies and biases the first sampling signal and the second sampling signal respectively, compares the signal intensities of the processed first sampling signal and the processed second sampling signal, and if the intensity of the first sampling signal is greater than the intensity of the second sampling signal, the sound source direction identification signal output by the sound source direction identification unit 40 is a high-level signal, and at this time, the sound source is located in a main collection area of the main sound collection unit 20, namely, a monitoring alarm area of the main monitoring device 10; if the intensity of the first sampling signal is less than or equal to the intensity of the second sampling signal, the sound source direction identification signal output by the sound source direction identification unit 40 is a low level signal, and at this time, the sound source does not enter the main collection area of the main sound collection unit 20, that is, the monitoring alarm area of the main monitoring device 10.
In this embodiment, the filtering unit 501 may be configured to gate a sound wave in a preset frequency band, where the preset frequency band may be consistent with a sound frequency band of the detection target, the filtering unit 501 performs filtering processing on the first sampling signal, gates the sound wave in the preset frequency band, outputs a third sampling signal, compares the third sampling signal with a preset threshold, and if the intensity of the third sampling signal is greater than or equal to the preset threshold, the sound source type identification signal output by the sound source type identification unit 50 is a high level signal, where the sound source is a sound emitted by the detection target; if the intensity of the third sampling signal is smaller than the preset threshold, the sound source type identification signal output by the sound source type identification unit 50 is a low level signal, and at this time, the sound source is not a sound emitted by the detection target.
Further, the triggering unit 60 receives the sound source direction identification signal and the sound source type identification signal, and performs logic judgment on the sound source direction identification signal and the sound source type identification signal, and if the sound source direction identification signal and the sound source type identification signal are both high level signals, the triggering unit 60 outputs the high level signal, and drives the alarm unit 70 to send out an alarm; otherwise, the triggering unit 60 outputs a low level signal, and the alarm unit 70 stops operating without giving an alarm.
Illustratively, the alarm unit 70 may be a warning light and a buzzer, and when the trigger unit 60 outputs a high level signal, the warning light is powered on and the buzzer is powered on to generate an audible alarm.
Therefore, the monitoring alarm device provided by the embodiment of the invention forms a main collection area of the main sound collection unit by the main sound collection unit and the auxiliary sound collection unit which are arranged around the main monitoring device, the main collection area of the main sound collection unit is positioned in a monitoring alarm area of the main monitoring device, the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, the sound source direction identification unit is adopted to determine the sound source direction according to the sizes of the first sampling signal and the second sampling signal, the sound source type identification unit is adopted to compare the first sampling signal with a preset threshold value to determine the sound source type, and the alarm unit is controlled to work or not by the sound source direction and the sound source type, so that independent monitoring alarm is realized by a pure hardware structure, a controller expansion interface is not required to be occupied, and excessive dependence on software algorithms and controller resources is avoided, the problems that the existing monitoring alarm system has high requirements on software algorithm and controller performance and the false alarm rate of a hardware module are solved, the use cost is reduced, the alarm triggering reliability is improved, and the false alarm rate is reduced.
Fig. 2 is a schematic view of an installation structure of a monitoring alarm device according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of another monitoring alarm apparatus provided in the embodiment of the present invention. In the embodiment shown in fig. 2, the main sound collection unit 20 and the at least two auxiliary sound collection units 30 form a main collection area of the main sound collection unit 20, which is within a monitoring alarm area of the preliminary main monitoring device 10.
Alternatively, as shown in fig. 2, the main sound collection unit 20 is disposed on a side of the main monitoring device 10 facing the monitoring alarm area, the auxiliary sound collection unit 30 is disposed on a side of the main monitoring device 10 away from the monitoring alarm area, a first plane where the main sound collection unit 20 and the auxiliary sound collection unit 30 are located is parallel to a horizontal plane, an orthographic projection of the monitoring alarm area of the main monitoring device 10 on the first plane has a central axis, and the main sound collection unit 20 is located on the central axis.
For example, the main monitoring apparatus 10 may be a web Camera (IPC), and the main monitoring apparatus 10 has a field angle, and an area corresponding to the field angle is a monitoring alarm area of the main monitoring apparatus 10.
In the present embodiment, referring to fig. 2, an orthographic projection of the monitoring alarm area of the main monitoring device 10 on a first plane may be a horizontal angle of view of the main monitoring device 10, and the orthographic projection of the monitoring alarm area is the horizontal angle of view of the main monitoring device 10, in the first plane, the main sound collection unit 20 is located on an angular bisector Y of the horizontal angle of view of the main monitoring device 10, and an orientation of the main sound collection unit 20 is consistent with an orientation of a lens of the main monitoring device 10.
In the present embodiment, the spatial relative positions of the main sound collection unit 20 and the auxiliary sound collection unit 30 and the main monitoring device 10 are kept unchanged, and when the lens of the main monitoring device 10 rotates, the main sound collection unit 20 and the auxiliary sound collection unit 30 rotate along with the lens of the main monitoring device 10, so that the main collection area of the main sound collection unit 20 is located in the lens monitoring alarm area of the main monitoring device 10.
Alternatively, as shown in fig. 2, the auxiliary sound collection unit 30 includes a first auxiliary sound collection unit 301 and a second auxiliary sound collection unit 302, the main sound collection unit 20, the first auxiliary sound collection unit 301 and the second auxiliary sound collection unit 302 are in a triangular layout structure, an orthographic projection of the monitoring alarm region of the main monitoring device 10 on a first plane has a first boundary B1 and a second boundary B2, a first line segment a1 is formed between the main sound collection unit 20 and the first auxiliary sound collection unit 301, a perpendicular bisector of the first line segment a1 coincides with the first boundary B1, a second line segment a2 is formed between the main sound collection unit 20 and the second auxiliary sound collection unit 302, and a perpendicular bisector of the second line segment a2 coincides with the second boundary B2.
For example, two auxiliary sound collection units 30 may be disposed in cooperation with the main monitoring device 10, and the relative positions of the main sound collection unit 20 and the two auxiliary sound collection units 30 are adjusted, so that the main collection area of the main sound collection unit 20 coincides with the monitoring alarm area of the main monitoring device 10.
Specifically, referring to fig. 2 in combination, the main sound collection unit 20, the first auxiliary sound collection unit 301, and the second auxiliary sound collection unit 302 are in a triangular layout structure, typically, the triangular layout structure is an isosceles triangle, the first auxiliary sound collection unit 301 and the second auxiliary sound collection unit 302 form a base of the triangular layout structure, a perpendicular bisector of the first line segment a1 coincides with the first boundary B1, and a perpendicular bisector of the second line segment a2 coincides with the second boundary B2 to form a main collection area of the main sound collection unit 20, as shown in fig. 2, a shadow area defined by the first boundary B1 and the second boundary B2 is the main collection area of the main sound collection unit 20, the main collection area coincides with the monitoring alarm area of the main monitoring device 10, and if the sound source is located in the main collection area of the main sound collection unit 20, the intensity of the first sampling signal output by the main sound collection unit 20 is greater than the intensity of the second sampling signal output by the auxiliary sound collection unit 30 And (4) degree.
Alternatively, as shown in fig. 1 and 3, the sound source bearing identifying unit 40 includes a signal strength comparing circuit 401, and the signal strength comparing circuit 401 includes at least two first comparators U1 and a second logical and circuit 402; the sound source direction identifying unit 40 further comprises a plurality of first signal processing circuits 403, the main sound collecting unit 20 is connected with the positive terminal + of the first comparator U1 through the first signal processing circuit 403, the auxiliary sound collecting unit 30 is connected with the negative terminal-of the first comparator U1 through the first signal processing circuit 403, and the first comparators U1 correspond to the auxiliary sound collecting units 30 one by one; the output terminal of the first comparator U1 is connected to the input terminal of the second and circuit 402, the first comparator U1 is configured to compare the strengths of the first and second sampled signals and output a sound source location identification signal according to the comparison result of the signal strengths of the at least two first comparators U1, and the second and circuit 402 is configured to output a sound source location identification signal according to the comparison result of the signal strengths of the at least two first comparators U1.
In this embodiment, the first signal processing circuit 403 is configured to amplify and forward bias the first and second sampling signals so as to facilitate data comparison by the first comparator U1.
Illustratively, as shown in fig. 3, the auxiliary sound pickup unit 30 includes a first auxiliary sound pickup unit 301 and a second auxiliary sound pickup unit 302, and the signal strength comparison circuit 401 includes a first comparator U1(1#) numbered 1# and a first comparator U1(2#) numbered 2 #. The main sound collection unit 20 outputs a first sampling signal, and the first sampling signal is amplified by the first signal processing circuit 403 and subjected to forward bias processing, and then is respectively transmitted to the positive terminal + of the first comparator U1(1#) with the number of 1# and the positive terminal + of the first comparator U1(2#) with the number of 2 #; the first auxiliary sound collection unit 301 outputs a second sampling signal, and the second sampling signal is amplified by the first signal processing circuit 403, subjected to forward bias processing, and then transmitted to the negative terminal-of the first comparator U1(1#) with the number of 1 #; the second auxiliary sound collecting unit 302 outputs a second sampling signal, which is amplified and forward biased by the first signal processing circuit 403 and then sent to the negative terminal-of the first comparator U1(2#) numbered 2 #.
As shown in fig. 3, the first comparator U1(1#) numbered 1# compares the first sampling signal output by the main sound collection unit 20 with the second sampling signal output by the first auxiliary sound collection unit 301, the first comparator U1(2#) numbered 2# compares the first sampling signal output by the main sound collection unit 20 with the second sampling signal output by the second auxiliary sound collection unit 302, the second logical and circuit 402 logically processes the output signal of the first comparator U1(1#) numbered 1# and the output signal of the first comparator U1(2#) numbered 2#, if the strength of the first sampling signal output by the main sound collection unit 20 is greater than the strength of the second sampling signal output by the first auxiliary sound collection unit 301, and the strength of the first sampling signal output by the main sound collection unit 20 is greater than the strength of the second sampling signal output by the second auxiliary sound collection unit 302, the sound source bearing identification signal output from the second logical and circuit 402 is a high level signal; otherwise, the sound source direction identification signal output from the second logical and circuit 402 is a low level signal.
It should be noted that, if the number of the auxiliary sound collection units 30 is an integer greater than 2, the first comparators U1 are in one-to-one correspondence with the auxiliary sound collection units 30, the positive terminal + of each first comparator U1 is connected to the same main sound collection unit 20, the output signal of the main sound collection unit 20 is compared with the output signals of the plurality of auxiliary sound collection units 30, and when the strength of the output signal of the main sound collection unit 20 is the highest, the sound source direction identification signal output by the second logical and circuit 402 is a high-level signal.
Alternatively, as shown in fig. 3, the first signal processing circuit 403 includes: the input end of the first amplifying circuit 404 is connected with the main sound collecting unit 20 or the auxiliary sound collecting unit 30, the output end of the first amplifying circuit 404 is connected with the input end of the first biasing circuit 405, and the output end of the first biasing circuit 405 is connected with the signal intensity comparing circuit 401.
For example, the first amplifying circuit 404 may include an amplifying circuit constructed by transistors, the main sound collection unit 20 and the auxiliary sound collection unit 30 may employ MIC sound sensors, the first sampling signal and the second sampling signal are analog voltage signals of several tens of millivolts, and the amplification factor of the first amplifying circuit 404 may be set to 100, so as to facilitate data comparison by the first comparator U1.
In this embodiment, the first sampling signal and the second sampling signal are ac signals, and after the first sampling signal and the second sampling signal are amplified, if the voltage of the amplified sampling signal is less than zero, the first bias circuit 405 is used to provide a forward dc bias voltage for the amplified sampling signal, so as to raise the sampling signal to a forward voltage, where the value of the forward voltage is equal to the absolute value of the voltage of the sampling signal before the offset processing.
Alternatively, as shown in fig. 1 and 3, the sound source type identifying unit 50 includes a filtering unit 501 and a threshold comparing circuit 502, the filtering unit 501 includes at least two band pass filtering circuits 5011 and a logical or gate circuit 5012, an input terminal of the band pass filtering circuit 5011 is connected to the main sound collecting unit 20 through the second signal processing circuit 504, an output terminal of the band pass filtering circuit 5011 is connected to an input terminal of the logical or gate circuit 5012, an output terminal of the logical or gate circuit 5012 is connected to an input terminal of the threshold comparing circuit 502, and the filtering unit 501 is configured to gate sound waves of a preset frequency band.
Illustratively, the band-pass filter circuits 5011 may be formed by resistors and capacitors, and by adjusting parameters of the resistors and the capacitors, all the band-pass filter circuits 5011 may be set to correspond to different signal passing frequency bands, and the logical and circuit 5012 may perform logical processing on output signals of all the band-pass filter circuits 5011, so that the overall signal passing frequency band of the filter unit 501 is equal to a preset frequency band.
Specifically, the preset frequency band may be consistent with the sound frequency band of the detection target, for example, if two band pass filter circuits 5011 are provided, and if the monitoring alarm device 01 is used to alarm the behavior of a stranger intruding into the monitoring alarm area, the signal passing frequency band of one band pass filter circuit 5011 may be a frequency band (for example, 85 hz to 1.1 khz) of human speaking sound, and the signal passing frequency band of the other band pass filter circuit 5011 may be a frequency band (for example, 500 hz to 800 hz) of human footsteps.
Further, the logical or gate circuit 5012 logically processes the output signals of the two band-pass filter circuits 5011, and superimposes the passing frequency bands of the signals of the two band-pass filter circuits 5011, so that the overall passing frequency band of the signal of the filtering unit 501 is equal to the preset frequency band.
It should be noted that the band-pass filter circuit 5011 may be configured to have a plurality of gating frequency bands, so as to gate the sound waves in the preset frequency bands, thereby reducing the complexity of the circuit.
Alternatively, as shown in fig. 3, the threshold comparing circuit 502 includes a second comparator U2 and a preset threshold voltage output unit 503, the preset threshold voltage output unit 503 is connected with the negative terminal of the second comparator U2; the sound source type identification unit 50 further includes a second signal processing circuit 504 and a timing circuit 505, an input end of the second signal processing circuit 504 is connected to the main sound collection unit 20, and an output end of the second signal processing circuit 504 is + connected to a positive terminal of a second comparator U2; the timing circuit 505 is disposed on the second comparator U2 and connected to the input terminal of the trigger unit 60, and the timing circuit 505 is configured to receive the output signal of the second comparator U2 and output a sound source type identification signal according to the sound source duration. Specifically, the timing circuit 505 determines whether the duration T of the high level signal output by the second comparator U2 reaches the preset time T0, and if the duration T reaches the preset time T0, the sound source type identification signal output by the timing circuit 505 is a high level signal; otherwise, the sound source type identification signal output from the timing circuit 505 is a low level signal.
Specifically, the preset threshold voltage output unit 503 is configured to provide a preset threshold voltage, the second comparator U2 compares the strength of the first sampled signal after being filtered, amplified and forward biased with a preset threshold, and if the strength of the first sampled signal is greater than the preset threshold, the second comparator U2 outputs a high level signal; otherwise, the second comparator U2 outputs a low signal.
In this embodiment, the timing time of the timing circuit 505 is set to be equal to the preset time T0, the output terminal of the second comparator U2 is connected to the control terminal of the timing circuit 505, if the second comparator U2 outputs a high level signal, the timing circuit 505 starts timing, and when the timing time reaches the preset time T0, the sound source type identification signal output by the timing circuit 505 is a high level signal, that is, the sound source is determined to be the sound emitted by the detection target; if the second comparator U2 outputs a low level signal, or the duration T of the second comparator U2 outputting a high level signal is less than the preset time T0, the sound source type identification signal output by the timing circuit 505 is a low level signal, that is, it is determined that the sound source is not the sound emitted by the detection target.
Alternatively, as shown in fig. 3, the second signal processing circuit 504 includes a second amplification circuit 5041 and a second bias circuit 5042, an input terminal of the second amplification circuit 5041 is connected to the main sound collection unit 20, an output terminal of the second amplification circuit 5041 is connected to an input terminal of the second bias circuit 5042, and an output terminal of the second bias circuit 5042 is connected to the threshold comparison circuit 502.
Illustratively, the second amplifying circuit 5041 may include an amplifying circuit constructed by transistors, the circuit structure of the second amplifying circuit 5041 may be consistent with the circuit structure of the first amplifying circuit 404, and the amplification factor of the second amplifying circuit 5041 may be set to 100, so as to facilitate data comparison of the second comparator U2.
In this embodiment, the first sampling signal is an ac signal, and after the first sampling signal is amplified, if the voltage of the amplified first sampling signal is less than zero, the second bias circuit 5042 is used to provide a forward dc bias voltage for the amplified sampling signal, so as to raise the first sampling signal to a forward voltage, where the value of the forward voltage is equal to the absolute value of the voltage of the first sampling signal before the offset processing.
Fig. 4 is a schematic circuit diagram of a timing circuit according to an embodiment of the present invention.
Optionally, as shown in fig. 4, the timing circuit 505 includes a timer 506, a relay 507, a current-limiting resistor 508, a charging capacitor 509, and a control capacitor C0, where the timer 506 is provided with a ground pin 1, a low-level trigger pin 2, an output pin 3, a reset pin 4, a voltage control pin 5, a high-level trigger pin 6, and a power supply pin 8; the grounding pin 1 is grounded, the reset pin 4 is connected with the power supply pin 8, the power supply pin 8 is connected with a power supply VCC, the low-level trigger pin 2 is connected with the high-level trigger pin 6, the high-level trigger pin 6 is connected with the power supply VCC through a current-limiting resistor 508, the voltage control pin 5 is grounded through a control capacitor C0, and the output pin 3 is connected with the input end of the trigger unit 60; the relay 507 is provided with a coil control end K, a main contact P1, a dynamic close contact P2 and a dynamic break contact P3, the coil control end K is connected with the output end of the second comparator U2, the main contact P1 is connected with the low-level trigger pin 2, the dynamic break contact P3 is grounded, the dynamic close contact P2 is connected with the first end of the charging capacitor 509, and the second end of the charging capacitor 509 is grounded.
The timer 506 may be a 555 timer, and the timing time T of the timer 506 is 1.1RC, where R is the resistance of the current-limiting resistor 508, C is the capacitance of the charging capacitor 509, and the resistance of the current-limiting resistor 508 and the capacitance of the charging capacitor 509 are adjusted to make the timing time T of the timer 506 equal to the preset time T0.
Specifically, a first sampling signal subjected to filtering, amplification and forward bias processing is input to the threshold comparison circuit 502, the threshold comparison circuit 502 compares the intensity of the first sampling signal with a preset threshold, and if the intensity of the first sampling signal is greater than the preset threshold, the threshold comparison circuit 502 outputs a high level signal; otherwise, the threshold comparison circuit 502 outputs a low level signal.
When the threshold comparison circuit 502 outputs a high level signal, the coil of the relay 507 loses power, the main contact P1 is controlled to be disconnected from the movable contact P2, the main contact P1 is conducted with the movable contact P3, the voltages of the low level trigger pin 2 and the high level trigger pin 6 are zero, and the sound source type identification signal output by the output pin 3 of the timer 506 is a low level signal; when the threshold comparison circuit 502 outputs a high level signal, the coil of the relay 507 is energized to control the main contact P1 to be conducted with the dynamic contact P2, the main contact P1 is disconnected with the dynamic contact P3, at this time, the power supply VCC charges the charging capacitor 509 through the current limiting resistor 508, and the low level contact isThe voltages of the power pin 2 and the high level trigger pin 6 are increased, and if the charging duration time T reaches the preset time T0, the voltages of the low level trigger pin 2 and the high level trigger pin 6 reach
The sound source type identification signal output from the output pin 3 of the timer 506 is a high level signal, and if the charging duration time T does not reach the preset time T0, the sound source type identification signal output from the output pin 3 of the timer 506 is a low level signal, which is beneficial to reducing the false triggering rate.
In this embodiment, a delay relay may be further used to determine the duration of the sound source, and output a sound source type identification signal according to the determination result.
Further, the triggering unit 60 receives the sound source direction identification signal and the sound source type identification signal, and performs logic judgment on the sound source direction identification signal and the sound source type identification signal, and if the sound source direction identification signal and the sound source type identification signal are both high level signals, the triggering unit 60 outputs the high level signal, and drives the alarm unit 70 to send out an alarm; otherwise, the triggering unit 60 outputs a low level signal, and the alarm unit 70 stops operating without giving an alarm.
Therefore, the monitoring alarm device provided by the embodiment of the invention determines the sound source position by amplifying and comparing the output signals of the main sound acquisition unit and the auxiliary sound acquisition unit which are arranged around the main monitoring device, determines the sound source type by filtering, amplifying, comparing and timing the output signal of the main sound acquisition unit, and controls whether the alarm unit works or not through the sound source position and the sound source type together, thereby realizing independent monitoring alarm through a pure hardware structure, avoiding occupying an expansion interface of a controller, avoiding excessive dependence on software algorithms and controller resources, solving the problems of high requirements of the existing monitoring alarm system on the software algorithms and the controller performance and high false alarm rate of a hardware module, being beneficial to reducing the use cost, improving the alarm triggering reliability and reducing the false alarm rate.
The embodiment of the invention also provides a monitoring system, and fig. 5 is a schematic structural diagram of the monitoring system provided by the embodiment of the invention. As shown in fig. 2, the monitoring system 02 includes the monitoring alarm apparatus 01 described above.
In this embodiment, the monitoring system may include a communication module, where the communication module is configured to implement wireless communication between the monitoring alarm device 01 and a monitoring center, and send an alarm signal of the monitoring alarm device 01 to the monitoring center.
The monitoring system provided by the embodiment of the invention is provided with a monitoring alarm device, the monitoring alarm device forms a main collection area of a main sound collection unit through a main sound collection unit and an auxiliary sound collection unit which are arranged around the main monitoring device, the main collection area of the main sound collection unit is superposed with a monitoring alarm area of the main monitoring device, the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, a sound source direction identification unit is adopted to determine the sound source direction according to the sizes of the first sampling signal and the second sampling signal, a sound source type identification unit is adopted to filter the first sampling signal, the sound source type is determined according to the size of a filtered third sampling signal, and whether an alarm unit works or not is controlled through the sound source direction and the sound source type, so that independent monitoring alarm is realized through a pure hardware structure, the method has the advantages that the controller expansion interface is not occupied, excessive dependence on software algorithms and controller resources is avoided, the problems that the existing monitoring alarm system is high in requirements on the software algorithms and the controller performance and high in false alarm rate of hardware modules are solved, the use cost is reduced, the alarm triggering reliability is improved, and the false alarm rate is reduced.
The embodiment of the invention also provides a monitoring alarm control method. Fig. 6 is a flowchart of a monitoring alarm control method according to an embodiment of the present invention. As shown in fig. 6, the control method includes the steps of:
s1: a first sampling signal and a second sampling signal around a main monitoring device are obtained.
In this embodiment, the main sound collection unit and the auxiliary sound collection unit may be disposed around the main monitoring device to form a main collection area of the main sound collection unit, and the main collection area is located in the monitoring alarm area of the main monitoring device, for example, the main collection area may coincide with the monitoring alarm area of the main monitoring device or be located in the monitoring alarm area of the main monitoring device. The main sound collection unit collects sound waves and outputs a first sampling signal, and the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal.
S2: and comparing the first sampling signal with the second sampling signal, and outputting a sound source position identification signal according to the comparison result.
Optionally, if the signal strength of the first sampling signal is greater than the signal strength of any one of the second sampling signals, the output sound source direction identification signal is a high-level signal; otherwise, the output sound source position identification signal is a low level signal.
S3: and filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result.
The method comprises the steps that a filtering unit can be set to gate sound waves of a preset frequency band, the preset frequency band can be kept consistent with a sound frequency band of a detection target, the filtering unit carries out filtering processing on a first sampling signal, gates the sound waves of the preset frequency band, outputs a third sampling signal, compares the third sampling signal with a preset threshold value, and if the intensity of the third sampling signal is greater than or equal to the preset threshold value, an output sound source type identification signal is a high-level signal, and at the moment, a sound source is sound emitted by the detection target; if the intensity of the third sampling signal is smaller than the preset threshold value, the output sound source type identification signal is a low level signal, and at the moment, the sound source is not the sound emitted by the detection target.
S4: and triggering an alarm according to the sound source position identification signal and the sound source type identification signal.
In this embodiment, the sound source direction identification signal and the sound source type identification signal are logically determined, and if the sound source direction identification signal and the sound source type identification signal are both high level signals, a high level signal is output to trigger an alarm; otherwise, a low level signal is output, and no alarm is triggered.
Optionally, the monitoring alarm control method further comprises the following steps: receiving a comparison result of the third sampling signal and a preset threshold value; timing the duration of the sound source according to the comparison result; and outputting a sound source type identification signal according to the sound source duration.
Therefore, the monitoring alarm control method provided by the embodiment of the invention is provided with the monitoring alarm device, the monitoring alarm device forms a main collection area of the main sound collection unit through the main sound collection unit and the auxiliary sound collection unit which are arranged around the main monitoring device, the main collection area of the main sound collection unit is overlapped with the monitoring alarm area of the main monitoring device, the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, the sound source direction identification unit is adopted to determine the sound source direction according to the sizes of the first sampling signal and the second sampling signal, the sound source type identification unit is adopted to filter the first sampling signal, the sound source type is determined according to the size of the filtered third sampling signal, and whether the alarm unit works or not is controlled through the sound source direction and the sound source type, so that independent monitoring alarm is realized through a pure hardware structure, the method has the advantages that the controller expansion interface is not occupied, excessive dependence on software algorithms and controller resources is avoided, the problems that the existing monitoring alarm system is high in requirements on the software algorithms and the controller performance and high in false alarm rate of hardware modules are solved, the use cost is reduced, the alarm triggering reliability is improved, and the false alarm rate is reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A monitoring alarm device, comprising: a main sound collection unit, an auxiliary sound collection unit, a sound source direction identification unit, a sound source type identification unit, a trigger unit and an alarm unit,
the main sound collection unit collects sound waves and outputs a first sampling signal, the auxiliary sound collection unit collects the sound waves and outputs a second sampling signal, and the main sound collection unit and the auxiliary sound collection unit are arranged around the main monitoring device;
the sound source direction identification unit is used for comparing the first sampling signal with the second sampling signal and outputting a sound source direction identification signal according to a comparison result;
the sound source type identification unit is used for filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result;
the triggering unit is used for controlling the alarm unit to work according to the sound source position identification signal and the sound source type identification signal.
2. The monitoring alarm device of claim 1, wherein the triggering unit comprises a first and circuit, an input terminal of the first and circuit is connected to an output terminal of the sound source direction identification unit and an output terminal of the sound source type identification unit, respectively, an output terminal of the first and circuit is connected to a control terminal of the alarm unit, and the first and circuit is configured to output a high level signal to control the alarm unit to alarm when the sound source direction identification signal is a high level signal and the sound source type identification signal is a high level signal.
3. A monitoring and alarm device according to claim 1, characterised in that said sound source orientation identification unit comprises a signal strength comparison circuit comprising at least two first comparators and a second logical and circuit;
the main sound acquisition unit is connected with the positive end of the first comparator, the auxiliary sound acquisition units are connected with the negative end of the first comparator, and the first comparators correspond to the auxiliary sound acquisition units one by one;
the output end of the first comparator is connected with the input end of the second logic AND circuit, the first comparator is used for outputting a signal strength comparison result according to the first sampling signal and the second sampling signal, and the second logic AND circuit is used for outputting a sound source position identification signal according to the signal strength comparison results of at least two first comparators.
4. A monitoring alarm device according to claim 3, characterised in that said sound source position identification unit further comprises a plurality of first signal processing circuits comprising: the input end of the first amplifying circuit is connected with the main sound collecting unit and/or the auxiliary sound collecting unit, the output end of the first amplifying circuit is connected with the input end of the first biasing circuit, and the output end of the first biasing circuit is connected with the signal intensity comparing circuit.
5. The monitoring alarm device according to claim 1, wherein said sound source type identification unit comprises a filtering unit and a threshold comparison circuit, said main sound collection unit being connected to an input of said threshold comparison circuit through said filtering unit;
the filtering unit is used for filtering the first sampling signal and outputting a third sampling signal;
and the threshold comparison circuit is used for comparing the third sampling signal with a preset threshold and outputting a sound source type identification signal according to a comparison result.
6. The monitoring alarm device of claim 5, wherein said sound source type identification unit further comprises a timing circuit, said threshold comparison circuit comprising a second comparator;
if the third sampling signal is larger than a preset threshold value, the second comparator outputs a high level signal, and the high level signal is input into the timing circuit;
the timing circuit is arranged between the second comparator and the input end of the trigger unit and used for receiving the output signal of the second comparator and outputting a sound source type identification signal according to the sound source duration.
7. The monitoring alarm device of claim 6, wherein the timing circuit comprises a timer, a relay, a current limiting resistor, a charging capacitor and a control capacitor, the timer is provided with a ground pin, a low level trigger pin, an output pin, a reset pin, a voltage control pin, a high level trigger pin and a power supply pin;
the grounding pin is grounded, the reset pin is connected with the power supply pin, the power supply pin is connected with a power supply, the low-level trigger pin is connected with the high-level trigger pin, the high-level trigger pin is connected with the power supply through the current-limiting resistor, the voltage control pin is grounded through the control capacitor, and the output pin is connected with the input end of the trigger unit;
the relay is provided with a coil control end, a main contact, a dynamic close contact and a dynamic break contact, the coil control end is connected with the output end of the second comparator, the main contact is connected with the low-level trigger pin, the dynamic break contact is grounded, the dynamic close contact is connected with the first end of the charging capacitor, and the second end of the charging capacitor is grounded.
8. A monitoring alarm device according to claim 6, characterised in that the sound source type identification unit further comprises a second signal processing circuit comprising a second amplification circuit and a second bias circuit, the input of the second amplification circuit being connected to the primary sound collection unit, the output of the second amplification circuit being connected to the input of the second bias circuit, the output of the second bias circuit being connected to the threshold comparison circuit.
9. A monitoring system comprising a monitoring alarm device according to any one of claims 1 to 8.
10. A monitoring alarm control method, comprising the steps of:
acquiring a first sampling signal and a second sampling signal around a main monitoring device;
comparing the first sampling signal with the second sampling signal, and outputting a sound source position identification signal according to a comparison result;
filtering the first sampling signal and outputting a third sampling signal, comparing the third sampling signal with a preset threshold value, and outputting a sound source type identification signal according to a comparison result;
and triggering an alarm according to the sound source position identification signal and the sound source type identification signal.
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