Wireless emergency broadcast alarm terminal with loudspeaker detection function and detection method

Abstract

The invention provides a wireless emergency broadcast alarm terminal with a loudspeaker detection function and a detection method, and the terminal is characterized in that a loudspeaker is sequentially connected with a loudspeaker fault detection circuit, a single-chip microcomputer, a wireless transmitting and receiving circuit, an intrinsically safe circuit a and an antenna, so as to form a loudspeaker fault signal transmission line; the loudspeaker is sequentially connected with the loudspeaker fault detection circuit, the single-chip microcomputer and the loudspeaker fault display circuit to form a loudspeaker fault signal local display circuit. The noise monitoring sensor is sequentially connected with the background noise detection circuit, the single-chip microcomputer, the audio power amplifier circuit, the loudspeaker fault detection circuit and the loudspeaker to form an automatic loudspeaker volume adjusting circuit. The loudspeaker has the function of detecting the sound production open circuit or short circuit fault of the loudspeaker, and the output volume of the loudspeaker can automatically output the corresponding volume according to the noise of the installation position.

Description

Technical Field

[0001] The invention relates to a wireless emergency broadcast alarm terminal, in particular to a wireless emergency broadcast alarm terminal with a loudspeaker detection function and a detection method. Background Art

[0002] At present, the production sites of industries such as petroleum, chemical industry, oil field, offshore drilling platform, metallurgy, textile, electric power, steel, pharmaceutical, military industry, oil depot, dock, forest, etc. mainly use emergency broadcast alarm terminal to realize emergency broadcast and alarm functions. In the existing wired transmission emergency broadcast alarm terminal, since it does not have the speaker fault detection function and background noise detection function, it is impossible to detect the speaker's sound circuit break or short circuit fault. At the same time, it also makes the speaker's output volume unable to automatically output the corresponding volume according to the noise level of its installation location.

[0003] Therefore, how to make the emergency broadcast alarm terminal have the function of detecting the speaker sound circuit breakage or short circuit fault, and how to make the speaker output volume automatically output the corresponding volume according to the noise level at the installation location, is a problem that needs to be solved urgently. Summary of the invention

[0004] In view of the shortcomings existing in the above problems, the present invention provides a wireless emergency broadcast alarm terminal and detection method with a speaker detection function having a speaker sound disconnection or short circuit fault detection function, and enabling the output volume of the speaker to automatically output a corresponding volume according to the noise level at the installation location.

[0005] To achieve the above-mentioned object, in a first aspect, the present invention provides a wireless emergency broadcast alarm terminal with a speaker detection function, comprising a single-chip microcomputer, a speaker, a speaker fault detection circuit, a speaker fault display circuit, an audio function circuit, a wireless transmitting and receiving circuit, an intrinsically safe circuit a, an antenna, a background monitoring sensor and a background noise detection circuit, wherein:

[0006] The speaker is sequentially connected to the speaker fault detection circuit, the single chip microcomputer, the wireless transmitting and receiving circuit, the intrinsically safe circuit a and the antenna to form a speaker fault signal transmission circuit, wherein:

[0007] The speaker fault detection circuit detects in real time whether the speaker has a short circuit or open circuit fault signal. When a short circuit or open circuit fault signal occurs, the signal is sent to the wireless transmitting and receiving circuit through the single chip microcomputer and modulated into a fault wireless signal, which is then uploaded to the system operation and maintenance management platform for display through the intrinsically safe circuit a and the antenna;

[0008] The speaker is sequentially connected to the speaker fault detection circuit, the single chip microcomputer and the speaker fault display circuit to form a speaker fault signal local display circuit, wherein;

[0009] The speaker fault detection circuit detects in real time whether the speaker has a short circuit or open circuit fault signal. When a short circuit or open circuit fault signal occurs, the fault signal is sent to the speaker fault display circuit via the single chip microcomputer for local display.

[0010] The noise monitoring sensor is connected to the background noise detection circuit, the single chip microcomputer, the audio power amplifier circuit, the speaker fault detection circuit and the speaker in sequence to form a speaker volume automatic adjustment circuit, wherein:

[0011] The noise monitoring sensor picks up environmental noise and sends it to the single-chip microcomputer after passing through the background noise detection circuit. When the detected environmental noise exceeds a set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker increases; when the detected environmental noise is lower than the set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker decreases.

[0012] In one embodiment, it also includes a power supply module, a frequency writing interface circuit, a linkage output circuit, an intrinsic safety circuit b, a switch input and output interface circuit and a flashing light, wherein:

[0013] The power supply module is respectively connected to the frequency writing interface circuit, the single-chip microcomputer, the wireless transmitting and receiving circuit, the linkage output circuit, the audio function circuit, the background noise detection circuit, the switch input and output interface circuit and the speaker fault detection circuit, and converts the AC220V power supply into multiple groups of DC direct current voltages to power the frequency writing interface circuit, the single-chip microcomputer, the wireless transmitting and receiving circuit, the linkage output circuit, the audio function circuit, the background noise detection circuit, the switch input and output interface circuit and the speaker fault detection circuit.

[0014] In one embodiment, the antenna is sequentially connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the audio power amplifier circuit, the speaker fault detection circuit and the speaker to form a speaker broadcasting circuit, wherein:

[0015] The wireless signal received by the antenna is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, the output audio is input to the audio power amplifier circuit for amplification, and the speaker is driven to broadcast through the speaker fault detection circuit.

[0016] In one embodiment, the antenna is sequentially connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the single chip microcomputer, the linkage output interface circuit, the intrinsically safe circuit b and the flashing light to form a wireless signal receiving and displaying circuit, wherein:

[0017] When the antenna receives a wireless signal, it is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, and the output control signal is controlled by the single-chip microcomputer to start the linkage output interface circuit, and the flashing light is driven to turn on through the intrinsically safe circuit b; when the antenna does not receive a wireless signal within a set time period, the single-chip microcomputer turns off the linkage output interface circuit, and drives the flashing light to turn off through the intrinsically safe circuit b.

[0018] In one embodiment, the antenna is sequentially connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the single chip microcomputer and the audio power amplifier circuit to form an audio opening and closing circuit, wherein:

[0019] When the antenna receives a wireless signal, it is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, and the output control signal is controlled by the single-chip microcomputer to start the audio power amplifier circuit. When the antenna does not receive a wireless signal within a set time period, the single-chip microcomputer turns off the audio power amplifier circuit.

[0020] In one embodiment, the switch input-output interface circuit is sequentially connected to the single-chip microcomputer, the wireless transmitting and receiving circuit, the intrinsically safe circuit a and the antenna to form a wireless signal communication line, wherein:

[0021] After the switch input-output interface circuit receives the passive switch contact closure signal, it is sent to the wireless transmitting and receiving circuit through the single-chip microcomputer to be modulated into a wireless signal, and then sent to the external wireless emergency broadcast and alarm terminal through the intrinsically safe circuit a and the antenna for linkage alarm. In addition, after the antenna receives the alarm signal, it is sent to the wireless transmitting and receiving circuit for demodulation and output through the intrinsically safe circuit a, and then the single-chip microcomputer controls the switch input-output interface circuit and the passive switch contact to output a closure signal.

[0022] In a second aspect, the present invention further provides a detection method, which is applied to the above-mentioned wireless emergency broadcast alarm terminal with a speaker detection function, comprising the following steps:

[0023] When the speaker fault detection circuit detects that the speaker has a short circuit or an open circuit fault, a fault signal is generated, and the fault signal is uploaded to the system operation and maintenance management platform for display via the intrinsically safe circuit a and the antenna, and / or is displayed locally via the speaker fault display circuit;

[0024] The noise monitoring sensor picks up the ambient noise, sends it to the microcontroller after passing through the background noise detection circuit, analyzes the ambient noise, and adjusts the output volume of the speaker based on the analysis results.

[0025] In one embodiment, the noise monitoring sensor picks up environmental noise and sends it to the single-chip microcomputer after passing through the background noise detection circuit. When the detected environmental noise exceeds a set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker increases; when the detected environmental noise is lower than the set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker decreases.

[0026] Compared with the prior art, the present invention has one of the following advantages:

[0027] By setting up a noise monitoring sensor and a background noise detection circuit, the output volume of the speaker can change with the background noise of its installation location, that is, when the ambient noise is large, the output volume of the speaker automatically increases, and when the ambient noise decreases, the output volume of the speaker automatically decreases;

[0028] By setting up a speaker fault detection circuit, it is possible to detect whether the speaker has a short circuit or open circuit fault. The fault signal can be displayed on the system operation and maintenance management platform, or displayed locally. It does not require very professional technicians or professional instruments to manage and maintain, effectively reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural principle block diagram of the wireless emergency broadcast alarm terminal in the present invention;

[0030] Figure 2 Flow chart of the detection method of the present invention.

[0031] The main reference numerals are as follows:

[0032] 1-housing; 2-power module; 3-frequency writing interface circuit 3; 4-linked output circuit; 5-intrinsically safe circuit b; 6-switch input and output interface circuit; 7-flash light; 8-single chip microcomputer; 9-speaker a; 10-speaker b; 11-fault detection circuit; 12-speaker fault display circuit; 13-audio function circuit; 14-wireless transmitting and receiving circuit; 15-intrinsically safe circuit a; 16-antenna; 17-noise monitoring sensor; 18-background noise detection circuit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "top surface", "bottom surface", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] Embodiment 1

[0036] like Figure 1 As shown, this embodiment provides a wireless emergency broadcast alarm terminal with a speaker detection function, including: a housing 1, a power module 2, a frequency writing interface circuit 3, a linkage output circuit 4, an intrinsically safe circuit b5, a switch input and output interface circuit 6, a flashing light 7, a single-chip computer 8, a speaker a9, a speaker b10, a fault detection circuit 11, a speaker fault display circuit 12, an audio function circuit 13, a wireless transmitting and receiving circuit 14, an intrinsically safe circuit a15, an antenna 16, a background monitoring sensor 17 and a background noise detection circuit 18.

[0037] Specifically, the speaker a9 is connected in parallel with the speaker b10, and is sequentially connected to the speaker fault detection circuit 11, the single chip computer 8, the wireless transmitting and receiving circuit 14, the intrinsic safety circuit a15 and the antenna 16 to form a speaker fault signal transmission circuit, wherein:

[0038] The speaker fault detection circuit 11 detects in real time whether the speaker has a short circuit or an open circuit fault signal. When a short circuit or an open circuit fault signal occurs, the fault signal is sent to the wireless transmitting and receiving circuit 14 through the single chip microcomputer 8 and modulated into a fault wireless signal, which is then uploaded to the system operation and maintenance management platform for display through the intrinsically safe circuit a15 and the antenna 16;

[0039] The loudspeaker a9 is arranged in parallel with the loudspeaker b10, and is sequentially connected to the loudspeaker fault detection circuit 11, the single chip computer 8 and the loudspeaker fault display circuit 12 to form a local display circuit for the loudspeaker fault signal, wherein;

[0040] The speaker fault detection circuit 11 detects in real time whether the speaker has a short circuit or an open circuit fault signal. When a short circuit or an open circuit fault signal occurs, the fault signal is sent to the speaker fault display circuit 12 via the single chip microcomputer 8 for local display.

[0041] The noise monitoring sensor 17 is connected in sequence to the background noise detection circuit 18, the single chip computer 8, the audio power amplifier circuit, the speaker fault detection circuit 11, the speaker a9 and the speaker b10 to form a speaker volume automatic adjustment circuit, wherein:

[0042] The noise monitoring sensor 17 picks up the environmental noise and sends it to the single-chip microcomputer 8 after passing through the background noise detection circuit 18. When the detected environmental noise exceeds the set value, the single-chip microcomputer 8 sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker a9 and the speaker b10 increases; when the detected environmental noise is lower than the set value, the single-chip microcomputer 8 sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker a9 and the speaker b10 decreases.

[0043] Exemplarily, the noise signal collected by the noise monitoring sensor is input into the single chip microcomputer through the background noise detection circuit, and the single chip microcomputer analyzes the current noise signal to obtain the current decibel value (for example, the noise value obtained is 77 decibels). The current decibel value is compared with the previously set noise value (for example, the set noise value during the day is 60 decibels), and the difference between the current decibel value and the set noise value is 17 decibels. According to the preset volume automatic adjustment regulations (that is, when the current decibel value is greater than the set noise value, if the difference is 10 decibels, the current volume increases by 1 times the magnification, if the difference is greater than 5 decibels, the current volume increases by 0.8 times the magnification, and if the difference is less than 5 decibels, the current volume increases by 0.5 times the magnification), according to the current difference, the single chip microcomputer inputs a control instruction to increase the magnification by 1.8 times to the audio power amplifier circuit, and the audio power amplifier circuit increases the output volume of speakers a and b to 1.8 times the current volume according to the current control instruction.

[0044] The noise signal collected by the noise monitoring sensor is input into the single chip microcomputer through the background noise detection circuit. The single chip microcomputer analyzes the current noise signal and obtains the current decibel value (for example, the noise value obtained is 41 decibels). The current decibel value is compared with the previously set noise value (for example, the set noise value at night is 55 decibels), and the difference between the current decibel value and the set noise value is -14 decibels. According to the preset volume automatic adjustment regulations (that is, when the current decibel value is less than the set noise value, if the difference is 10 decibels, the current volume is reduced by 1 times the magnification, if the difference is greater than 5 decibels, the current volume is reduced by 0.8 times the magnification, and if the difference is less than 5 decibels, the current volume is reduced by 0.5 times the magnification), according to the current difference, the single chip microcomputer inputs a control instruction to reduce the magnification by 1.5 times to the audio power amplifier circuit, and the audio power amplifier circuit reduces the output volume of speakers a and b to 1.5 times the current volume according to the current control instruction.

[0045] Furthermore, the power supply module 2 is respectively connected to the frequency writing interface circuit, the single-chip computer 8, the wireless transmitting and receiving circuit 14, the linkage output circuit 4, the audio function circuit 13, the background noise detection circuit 18, the switch input and output interface circuit 6 and the speaker fault detection circuit 11, and converts the AC220V power supply into multiple groups of DC direct current voltages to power the frequency writing interface circuit, the single-chip computer 8, the wireless transmitting and receiving circuit 14, the linkage output circuit 4, the audio function circuit 13, the background noise detection circuit 18, the switch input and output interface circuit 6 and the speaker fault detection circuit 11.

[0046] Further, the antenna 16 is connected to the intrinsically safe circuit a15, the wireless transmitting and receiving circuit 14, the audio power amplifier circuit, the speaker fault detection circuit 11 and the speaker in sequence to form a speaker broadcasting circuit, wherein:

[0047] The wireless signal received by antenna 16 is sent to wireless transmitting and receiving circuit 14 for demodulation through intrinsically safe circuit a15, the output audio is input to audio power amplifier circuit for amplification, and the speaker is driven to broadcast through speaker fault detection circuit 11.

[0048] Furthermore, the antenna 16 is sequentially connected to the intrinsically safe circuit a15, the wireless transmitting and receiving circuit 14, the single chip microcomputer 8, the linkage output interface circuit, the intrinsically safe circuit b5 and the flashing light 7 to form a wireless signal receiving and displaying circuit, wherein:

[0049] When the antenna 16 receives a wireless signal, it is sent to the wireless transmitting and receiving circuit 14 for demodulation via the intrinsically safe circuit a15. The output control signal is controlled by the single-chip microcomputer 8 to start the linkage output interface circuit, and the flash light 7 is driven to turn on via the intrinsically safe circuit b5. When the antenna 16 fails to receive a wireless signal for 10 seconds, the single-chip microcomputer 8 turns off the linkage output interface circuit, and the flash light 7 is driven to turn off via the intrinsically safe circuit b5.

[0050] Furthermore, the antenna 16 is connected in sequence to the intrinsically safe circuit a15, the wireless transmitting and receiving circuit 14, the single chip microcomputer 8 and the audio power amplifier circuit to form an audio opening and closing circuit, wherein:

[0051] When the antenna 16 receives a wireless signal, it is sent to the wireless transmitting and receiving circuit 14 for demodulation via the intrinsically safe circuit a15. The output control signal is controlled by the single-chip microcomputer 8 to start the audio power amplifier circuit. When the antenna 16 fails to receive a wireless signal for 10 seconds, the single-chip microcomputer 8 turns off the audio power amplifier circuit.

[0052] Furthermore, the switch input-output interface circuit 6 is sequentially connected to the single-chip computer 8, the wireless transmitting and receiving circuit 14, the intrinsically safe circuit a15 and the antenna 16 to form a wireless signal communication line, wherein:

[0053] After the switch input-output interface circuit 6 receives the passive switch contact closure signal, it is sent to the wireless transmitting and receiving circuit 14 through the single-chip microcomputer 8 for modulation into a wireless signal, and is sent to the external wireless emergency broadcast and alarm terminal through the intrinsically safe circuit a15 and the antenna 16 for linkage alarm. In addition, after the antenna 16 receives the alarm signal, it is sent to the wireless transmitting and receiving circuit 14 for demodulation and output through the intrinsically safe circuit a15, and the single-chip microcomputer 8 controls the switch input-output interface circuit 6 and the passive switch contact to output a closing signal.

[0054] Embodiment 2

[0055] like Figure 2 As shown, this embodiment also provides a detection method, which is applied to the wireless emergency broadcast alarm terminal with a speaker detection function recorded in the above-mentioned embodiment 1, and includes the following steps:

[0056] S1. When the speaker fault detection circuit detects that the speaker has a short circuit or an open circuit fault, a fault signal is generated. The fault signal is uploaded to the system operation and maintenance management platform via the intrinsically safe circuit a and the antenna for display, and / or is displayed locally via the speaker fault display circuit;

[0057] S2, the noise monitoring sensor picks up the environmental noise, sends it to the microcontroller after passing through the background noise detection circuit, analyzes the environmental noise, and adjusts the output volume of the speaker according to the analysis results.

[0058] Furthermore, in step S1, it includes:

[0059] The speaker fault detection circuit detects in real time whether the speaker has a short circuit or open circuit fault signal. When a fault occurs, it is sent to the wireless transmitting and receiving circuit through the single chip microcomputer to be modulated into a fault wireless signal, which is then uploaded to the system operation and maintenance management platform for display through the intrinsically safe circuit a and the antenna;

[0060] Alternatively, the speaker fault detection circuit detects in real time whether a short circuit or open circuit fault signal occurs in the speaker. When a fault occurs, the fault signal is sent to the speaker fault display circuit via the single chip microcomputer for local display.

[0061] Furthermore, in step S2, it includes:

[0062] The noise monitoring sensor picks up environmental noise and sends it to the microcontroller after passing through the background noise detection circuit. When the detected environmental noise exceeds the set value, the microcontroller sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker increases; when the detected environmental noise is lower than the set value, the microcontroller sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker decreases.

[0063] The wireless emergency broadcast alarm terminal with a speaker detection function described in the first embodiment and the detection method described in the first embodiment also have the following features:

[0064] Wireless transmission is adopted, and real-time voice broadcast and alarm broadcast functions can be realized without signal cable connection, which saves the cost of signal transmission cable materials, signal conversion equipment and corresponding construction costs, greatly reducing the cost of system construction. At the same time, wireless communication also improves the ability to apply to a variety of complex usage scenarios;

[0065] Set up passive switch contact input and output interface circuits, which can be linked with other systems to issue alarm broadcasts, and can also be linked to output signals to other systems;

[0066] Set up linkage output interface circuit, which can broadcast linkage external flash light prompt function;

[0067] Set up wireless transmitting and receiving circuits, 1024 channel capacity, client software programming, can set the local number, area call number, all call number, speaker output volume and other functions.

[0068] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. A wireless emergency broadcast alarm terminal with a speaker detection function, characterized in that: It includes a single chip microcomputer, a speaker, a speaker fault detection circuit, a speaker fault display circuit, an audio function circuit, a wireless transmitting and receiving circuit, an intrinsically safe circuit a, an antenna, a background monitoring sensor and a background noise detection circuit, wherein: The speaker is sequentially connected to the speaker fault detection circuit, the single chip microcomputer, the wireless transmitting and receiving circuit, the intrinsically safe circuit a and the antenna to form a speaker fault signal transmission circuit, wherein: The speaker fault detection circuit detects in real time whether the speaker has a short circuit or open circuit fault signal. When a short circuit or open circuit fault signal occurs, the signal is sent to the wireless transmitting and receiving circuit through the single chip microcomputer and modulated into a fault wireless signal, which is then uploaded to the system operation and maintenance management platform for display through the intrinsically safe circuit a and the antenna; The speaker is sequentially connected to the speaker fault detection circuit, the single chip microcomputer and the speaker fault display circuit to form a speaker fault signal local display circuit, wherein; The speaker fault detection circuit detects in real time whether the speaker has a short circuit or open circuit fault signal. When a short circuit or open circuit fault signal occurs, the fault signal is sent to the speaker fault display circuit via the single chip microcomputer for local display. The noise monitoring sensor is connected to the background noise detection circuit, the single chip microcomputer, the audio power amplifier circuit, the speaker fault detection circuit and the speaker in sequence to form a speaker volume automatic adjustment circuit, wherein: The noise monitoring sensor picks up environmental noise and sends it to the single-chip microcomputer after passing through the background noise detection circuit. When the detected environmental noise exceeds a set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker increases; when the detected environmental noise is lower than the set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker decreases.

2. The wireless emergency broadcast alarm terminal with speaker detection function according to claim 1 is characterized in that: It also includes a power module, a frequency writing interface circuit, a linkage output circuit, an intrinsic safety circuit b, a switch input and output interface circuit and a flashing light, among which: The power supply module is respectively connected to the frequency writing interface circuit, the single-chip microcomputer, the wireless transmitting and receiving circuit, the linkage output circuit, the audio function circuit, the background noise detection circuit, the switch input and output interface circuit and the speaker fault detection circuit, and converts the AC220V power supply into multiple groups of DC direct current voltages to power the frequency writing interface circuit, the single-chip microcomputer, the wireless transmitting and receiving circuit, the linkage output circuit, the audio function circuit, the background noise detection circuit, the switch input and output interface circuit and the speaker fault detection circuit.

3. The wireless emergency broadcast alarm terminal with speaker detection function according to claim 2 is characterized in that: The antenna is connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the audio power amplifier circuit, the speaker fault detection circuit and the speaker in sequence to form a speaker broadcasting circuit, wherein: The wireless signal received by the antenna is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, the output audio is input to the audio power amplifier circuit for amplification, and the speaker is driven to broadcast through the speaker fault detection circuit.

4. The wireless emergency broadcast alarm terminal with speaker detection function according to claim 2, characterized in that: The antenna is connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the single chip microcomputer, the linkage output interface circuit, the intrinsically safe circuit b and the flashing light in sequence to form a wireless signal receiving and displaying circuit, wherein: When the antenna receives a wireless signal, it is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, and the output control signal is controlled by the single-chip microcomputer to start the linkage output interface circuit, and the flashing light is driven to turn on through the intrinsically safe circuit b; when the antenna does not receive a wireless signal within a set time period, the single-chip microcomputer turns off the linkage output interface circuit, and drives the flashing light to turn off through the intrinsically safe circuit b.

5. The wireless emergency broadcast alarm terminal with speaker detection function according to claim 2, characterized in that: The antenna is sequentially connected to the intrinsically safe circuit a, the wireless transmitting and receiving circuit, the single chip microcomputer and the audio power amplifier circuit to form an audio opening and closing circuit, wherein: When the antenna receives a wireless signal, it is sent to the wireless transmitting and receiving circuit for demodulation through the intrinsically safe circuit a, and the output control signal is controlled by the single-chip microcomputer to start the audio power amplifier circuit. When the antenna does not receive a wireless signal within a set time period, the single-chip microcomputer turns off the audio power amplifier circuit.

6. The wireless emergency broadcast alarm terminal with speaker detection function according to claim 2, characterized in that: The switch input-output interface circuit is sequentially connected to the single-chip microcomputer, the wireless transmitting and receiving circuit, the intrinsically safe circuit a and the antenna to form a wireless signal communication line, wherein: After the switch input-output interface circuit receives the passive switch contact closure signal, it is sent to the wireless transmitting and receiving circuit through the single-chip microcomputer to be modulated into a wireless signal, and then sent to the external wireless emergency broadcast and alarm terminal through the intrinsically safe circuit a and the antenna for linkage alarm. In addition, after the antenna receives the alarm signal, it is sent to the wireless transmitting and receiving circuit for demodulation and output through the intrinsically safe circuit a, and then the single-chip microcomputer controls the switch input-output interface circuit and the passive switch contact to output a closure signal.

7. A detection method, applied to the wireless emergency broadcast alarm terminal with speaker detection function as described in any one of claims 1 to 6, characterized in that: The following steps are involved: When the speaker fault detection circuit detects that the speaker has a short circuit or an open circuit fault, a fault signal is generated, and the fault signal is uploaded to the system operation and maintenance management platform for display via the intrinsically safe circuit a and the antenna, and / or is displayed locally via the speaker fault display circuit; The noise monitoring sensor picks up the ambient noise, sends it to the microcontroller after passing through the background noise detection circuit, analyzes the ambient noise, and adjusts the output volume of the speaker based on the analysis results.

8. The detection method according to claim 7, characterized in that: The noise monitoring sensor picks up environmental noise and sends it to the single-chip microcomputer after passing through the background noise detection circuit. When the detected environmental noise exceeds a set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to increase the amplification factor, and the output volume of the speaker increases; when the detected environmental noise is lower than the set value, the single-chip microcomputer sends a control signal to control the audio power amplifier circuit to reduce the amplification factor, and the output volume of the speaker decreases.

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