Alarm type judging device of broadcast transmitting system

Abstract

The embodiment of the utility model discloses an alarm type judging device of a broadcast transmitting system, which is used for judging the alarm type of a multi-channel broadcast transmitting system. The alarm type judgment device of the broadcast transmitting system comprises a preprocessing module, an alarm signal input module, an output logic control module, a switching output module, a logic level conversion module, a display module and a control module. When a fault alarm occurs, an on-duty check-in person can know the type of the fault in time, so that the fault judgment time is saved, and effective emergency disposal is quickly made. The problem that check-in personnel and maintenance personnel cannot visually and timely know the alarm type of the fault transmitting system is solved. Multi-channel alarm signal monitoring can be realized, and more monitoring requirements of a frequency modulation broadcast emission system can be satisfied.

Description

Technical Field

[0001] This utility model relates to the field of alarm processing technology, and in particular to an alarm type determination device for a broadcast transmission system. Background Technology

[0002] Currently, FM radio transmitters are equipped with monitoring and alarm systems divided into audio alarm systems and carrier alarm systems. The audio alarm system will issue an alarm when a program on a certain frequency is interrupted. When a transmitter on a certain broadcast frequency malfunctions, the carrier alarm system will respond immediately, informing the operator which frequency carrier has been interrupted.

[0003] When a carrier alarm occurs during actual program monitoring, the first reaction of the on-duty personnel is to check which frequency program experienced the carrier drop. After identifying the faulty frequency, the next step is to go to the equipment room to observe what exactly happened on that frequency and whether further emergency handling is needed. If further emergency handling is required, the time cost of the above process is incalculable. Sometimes, the faulty frequency may only experience a momentary carrier drop, causing the fault to disappear before the on-duty personnel can even react, which inconveniences the equipment maintenance personnel in the equipment room to diagnose the equipment fault. Utility Model Content

[0004] This invention provides an alarm type determination device for a broadcast transmission system to solve the problem that operators and maintenance personnel cannot intuitively and promptly understand the alarm type of a faulty transmission system.

[0005] This utility model provides an alarm type determination device for a broadcast transmission system, used to determine the alarm type of a multi-channel broadcast transmission system. The alarm type determination device for the broadcast transmission system includes a preprocessing module, an alarm signal input module, an output logic control module, a switching output module, a logic level conversion module, a display module, and a control module.

[0006] Each first input terminal of the preprocessing module is connected to a shutdown alarm signal of a broadcast transmission system, and each second input terminal of the preprocessing module is connected to a main / backup switchover alarm signal of the broadcast transmission system. The preprocessing module is used to convert the shutdown alarm signal of each broadcast transmission system into a first voltage signal and to convert the main / backup switchover alarm signal of each transmission system into a second voltage signal.

[0007] Each input terminal of the alarm signal input module is connected to each output terminal of the preprocessing module in a one-to-one correspondence. Each output terminal of the alarm signal input module is connected to each input terminal of the output logic control module. Each first voltage signal and / or second voltage signal is output to the output logic control module after being electrically isolated by the alarm signal input module.

[0008] The control terminal of the output logic control module is connected to the first output terminal of the control module. Each output terminal of the output logic control module is connected to each input terminal of the switching output module and each first input terminal of the display module in a one-to-one correspondence. The output logic control module is used to sequentially select one input terminal and one output terminal of the output logic control module according to the control signal provided by the control module. The display module is used to determine the alarm signal type of each broadcast transmission system according to the output terminal of the output logic control module. The control terminal of the switching output module is connected to the first output terminal of the control module. The output terminal of the switching output module is connected to the input terminal of the logic level conversion module. The switching output module is used to select one input terminal and one output terminal of the switching output module according to the control signal provided by the control module.

[0009] The output terminal of the logic level conversion module is connected to the first input terminal of the control module. The logic level conversion module is used to convert one of the first voltage signals and / or the second voltage signals output by the switching output module into logic level signals for output.

[0010] The second output terminal of the control module is connected to the second input terminal of the display module, and the control module is used to determine the alarm signal type of the broadcast transmission system according to the logic level signal.

[0011] The display module is also used to display the number of fault frequencies of the broadcast transmission system.

[0012] Optionally, the preprocessing module includes a multi-channel preprocessing unit, which includes a first resistor, a second resistor, a first voltage follower, a first diode, a third resistor, a fourth resistor, a second voltage follower, and a second diode.

[0013] The first end of the first resistor is connected to a power-off alarm signal of the transmitting system. The second end of the first resistor is connected to the positive input terminal of the first voltage follower and the first end of the second resistor. The second end of the second resistor is grounded. The negative input terminal of the first voltage follower is connected to the output terminal of the first voltage follower. The output terminal of the first voltage follower is also connected to the positive terminal of the first diode. The negative terminal of the first diode is connected to the negative terminal of the second diode and is connected to an input terminal of the alarm signal input module.

[0014] The first end of the third resistor is connected to a primary / backup switchover alarm signal of the transmitting system. The second end of the third resistor is connected to the positive input terminal of the second voltage follower and the first end of the fourth resistor. The second end of the fourth resistor is grounded. The negative input terminal of the second voltage follower is connected to the output terminal of the second voltage follower. The output terminal of the second voltage follower is connected to the positive terminal of the second diode.

[0015] Optionally, the alarm signal input module includes a multi-channel alarm signal input unit, which includes a third diode and a fifth resistor. The positive terminal of the third diode is connected to an output terminal of the preprocessing module, and the negative terminal of the third diode is connected to an input terminal of the output logic control module and a first terminal of the fifth resistor. The second terminal of the fifth resistor is grounded.

[0016] Optionally, the output logic control module includes a decoder and a multi-output logic control unit. The output logic control unit includes a first analog switch and a first NOT gate. The input terminal of the first analog switch is connected to an output terminal of the alarm signal input module. The output terminal of the first analog switch is connected to a first input terminal of the display module and an input terminal of the switching output module, respectively. The input terminal of the first NOT gate is connected to the output terminal of the decoder. The output terminal of the first NOT gate is connected to the control terminal of the first analog switch. The input terminal of the decoder is connected to the first output terminal of the control module.

[0017] Optionally, the output logic control module further includes a first toggle switch and a first resistor array. The first end of the first toggle switch is connected to the control terminal of the multiple first analog switches and the first end of the first resistor array, respectively. The second end of the first resistor array is grounded. The second end of the first toggle switch is connected to the output terminal of the multiple first NOT gate. The first toggle switch is used to close the input and output terminals of one first analog switch when one transmission system is normally powered off.

[0018] Optionally, the switching output module includes a second analog switch and a sixth resistor. The input terminal of the second analog switch is connected to the output terminal of the output logic control module in a one-to-one correspondence. The control terminal of the second analog switch is connected to the first terminal of the control module. The output terminal of the second analog switch is connected to the first terminal of the sixth resistor and the input terminal of the logic level conversion module, respectively. The second terminal of the sixth resistor is grounded.

[0019] Optionally, the logic level conversion module includes a seventh resistor, an eighth resistor, a ninth resistor, a first comparator, a first OR gate, a tenth resistor, an eleventh resistor, a second comparator, a twelfth resistor, and a first buffer;

[0020] The first end of the seventh resistor is connected to the power signal, the second end of the seventh resistor is connected to the first end of the eighth resistor, the second end of the eighth resistor is grounded, the negative input terminal of the first comparator is connected to the second end of the seventh resistor, the positive input terminal of the first comparator is connected to the output terminal of the switching output module, the power supply terminal of the first comparator is connected to the power signal, the ground terminal of the first comparator is grounded, the output terminal of the first comparator is connected to the first input terminal of the first OR gate, the first end of the ninth resistor is connected to the power supply terminal of the first comparator, the second end of the ninth resistor is connected to the output terminal of the first comparator, and the output terminal of the first comparator is connected to the first input terminal of the first OR gate.

[0021] The first end of the tenth resistor is connected to the power signal, the second end of the tenth resistor is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is grounded, the positive input of the second comparator is connected to the switching output module, the negative input of the second comparator is connected to the second end of the tenth resistor, the power supply terminal of the second comparator is connected to the power signal, the ground terminal of the second comparator is grounded, the first end of the twelfth resistor is connected to the power supply terminal of the second comparator, the output of the second comparator is connected to the second end of the twelfth resistor, the second input of the first OR gate, and the positive terminal of the first buffer, respectively, the negative terminal of the first buffer is connected to the first input terminal of the control module, and the output of the first OR gate is connected to the first input terminal of the control module.

[0022] Optionally, the display module includes a multi-channel computer room alarm unit and a remote alarm counting unit. Each input terminal of the computer room alarm unit is connected to each output terminal of the output logic control module in a one-to-one correspondence. The computer room alarm unit is used to trigger an alarm based on the first voltage signal and / or the second voltage signal output by the output logic control module. The input terminal of the remote alarm counting unit is connected to the second output terminal of the control module. The remote alarm counting unit is used to display the number of fault frequencies of the broadcast transmission system.

[0023] Optionally, the computer room alarm unit includes a third voltage follower, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third comparator, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourth comparator, a first NOR gate, a third NOT gate, a first latch, a reset button, a nineteenth resistor, a first light-emitting diode, a twentieth resistor, a fourth NOT gate, a second latch, a second light-emitting diode, and a twenty-first resistor.

[0024] The positive input terminal of the third voltage follower is connected to one output terminal of the output logic control module, the negative input terminal of the third voltage follower is connected to its output terminal, the power supply terminal of the third voltage follower is connected to a power signal, the ground terminal of the third voltage follower is grounded, the output terminal of the third voltage follower is also connected to the positive input terminals of the third comparator and the fourth comparator, respectively, the first terminal of the thirteenth resistor is connected to the power signal, the second terminal of the thirteenth resistor is connected to the first terminal of the fourteenth resistor, the second terminal of the fourteenth resistor is grounded, and the negative input terminal of the third comparator is connected to the first terminal of the thirteenth resistor. The third comparator has two terminals connected: its power supply terminal is connected to a power signal, its ground terminal is grounded, its output terminal is connected to the first input terminal of the first NOR gate and the first terminal of the fifteenth resistor, the second terminal of the fifteenth resistor is connected to the power supply terminal of the third comparator, the first terminal of the sixteenth resistor is connected to a power signal, the second terminal of the sixteenth resistor is connected to the first terminal of the seventeenth resistor, the second terminal of the seventeenth resistor is grounded, the negative input terminal of the fourth comparator is connected to the second terminal of the sixteenth resistor, and its output terminal is connected to the first terminal of the eighteenth resistor, the first NOR gate ... The second input terminal of the NOT gate is connected to the input terminal of the fourth NOT gate; the second terminal of the eighteenth resistor is connected to the power supply terminal of the fourth comparator; the output terminal of the first NOR gate is connected to the input terminal of the third NOT gate; the output terminal of the third NOT gate is connected to the first terminal of the first latch; the second terminal of the first latch is grounded; the third terminal of the first latch is connected to the first terminal of the reset button and the first terminal of the nineteenth resistor; the second terminal of the reset button is connected to the power signal; the second terminal of the nineteenth resistor is grounded; the fourth terminal of the first latch is connected to the power signal; and the fifth terminal of the first latch is connected to the first light-emitting diode. The negative terminal of the first LED is connected to the negative terminal of the second LED. The positive terminal of the first LED is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the power signal. The output terminal of the fourth NOT gate is connected to the first end of the second latch. The second end of the second latch is grounded. The third end of the second latch is connected to the first end of the reset button and the first end of the nineteenth resistor. The fourth end of the second latch is connected to the power signal. The fifth end of the second latch is connected to the negative terminal of the second LED. The positive terminal of the second LED is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the power signal.

[0025] Optionally, the remote alarm counting unit includes a digital tube, a first D-trigger latch, and a second D-trigger latch. The first terminals of the first D-trigger latch and the second D-trigger latch are both connected to the second output terminal of the control module. The second terminal of the first D-trigger latch is connected to the first terminal of the digital tube. The third terminal of the first D-trigger latch is grounded. The second terminal of the second D-trigger latch is connected to the second terminal of the digital tube. The third terminal of the second D-trigger latch is grounded.

[0026] The technical solution of this utility model embodiment includes a preprocessing module, an alarm signal input module, an output logic control module, an output switching module, a logic level conversion module, a display module, and a control module. The preprocessing module performs voltage conversion on multiple alarm signals, ensuring different types of alarm signals correspond to different voltage values. When alarm signals from multiple broadcast transmission systems are output cyclically, these signals are sequentially output to the display module, which displays the alarm signal and its type for each system. This allows for direct determination of the alarm fault type based on the displayed information. When a fault alarm occurs, on-duty personnel can promptly understand the fault type, saving time and enabling quick and effective emergency response. The control module's preset program cyclically scans the output of multiple alarm signals, ensuring that only one alarm signal passes through the alarm type determination device at any given time. This effectively avoids signal interference from simultaneous monitoring of multiple alarm signals, improving the device's accuracy. This solves the problem of on-duty and maintenance personnel not being able to intuitively and promptly understand the alarm type of a faulty transmission system. It enables multi-channel alarm signal monitoring, meeting the monitoring needs of more FM broadcast transmission systems.

[0027] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an alarm type determination device for a broadcast transmission system provided in an embodiment of the present invention;

[0030] Figure 2This is a circuit diagram of the preprocessing unit provided in this embodiment of the utility model;

[0031] Figure 3 This is a circuit diagram of the alarm signal input unit provided in this embodiment of the utility model;

[0032] Figure 4 This is a circuit diagram of the alarm signal input module for 16-channel alarm signal input provided in this embodiment of the utility model;

[0033] Figure 5 This is a circuit diagram of the output logic control module for a single alarm signal input provided in this embodiment of the utility model;

[0034] Figure 6 This is a circuit diagram of the output logic control module for 16-channel alarm signal input provided in this embodiment of the utility model.

[0035] Figure 7 This is a circuit schematic diagram of the switching output module provided in this embodiment of the utility model;

[0036] Figure 8 This is a circuit diagram of the switching output module for 16-channel alarm signal input provided in this embodiment of the utility model;

[0037] Figure 9 This is a circuit schematic diagram of the logic level conversion module provided in this embodiment of the utility model;

[0038] Figure 10 This is a circuit diagram of the computer room alarm unit provided in this embodiment of the utility model;

[0039] Figure 11 This is a circuit diagram of the remote alarm counting unit provided in this embodiment of the utility model;

[0040] Figure 12 This is a circuit diagram of the control module provided in an embodiment of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] Figure 1 This is a schematic diagram of an alarm type determination device for a broadcast transmission system provided in an embodiment of the present invention. This embodiment is applicable to scenarios where an alarm type is determined when a carrier alarm occurs in a broadcast transmission system. Figure 1 As shown, the alarm type determination device for the broadcast transmission system is used to determine the alarm type of the multi-channel broadcast transmission system. The device includes: a preprocessing module 101, an alarm signal input module 102, an output logic control module 103, a switching output module 104, a logic level conversion module 105, a display module 106, and a control module 107.

[0044] Each first input terminal of the preprocessing module 101 is connected to a shutdown alarm signal of a broadcast transmission system, and each second input terminal of the preprocessing module 101 is connected to a main / backup switch alarm signal of a broadcast transmission system. The preprocessing module 101 is used to convert the shutdown alarm signal of each broadcast transmission system into a first voltage signal and to convert the main / backup switch alarm signal of each transmission system into a second voltage signal.

[0045] Each input terminal of the alarm signal input module 102 is connected to each output terminal of the preprocessing module 101 in a one-to-one correspondence. Each output terminal of the alarm signal input module 102 is connected to each input terminal of the output logic control module 103. Each first voltage signal and / or second voltage signal is output to the output logic control module 103 after being electrically isolated by the alarm signal input module 102.

[0046] The control terminal of the output logic control module 103 is connected to the first output terminal of the control module 107. Each output terminal of the output logic control module 103 is connected to each input terminal of the switching output module 104 and each first input terminal of the display module 106 in a one-to-one correspondence. The output logic control module 103 is used to sequentially select one input terminal and one output terminal of the output logic control module 103 according to the control signal provided by the control module 107. The display module 107 is used to determine the alarm signal type of each broadcast transmission system according to the output terminal of the output logic control module 103.

[0047] The control terminal of the switching output module 104 is connected to the first output terminal of the control module 107, and the output terminal of the switching output module 104 is connected to the input terminal of the logic level conversion module 105. The switching output module 104 is used to select and switch one input terminal and one output terminal of the switching output module 104 according to the control signal provided by the control module 107.

[0048] The output terminal of the logic level conversion module 105 is connected to the first input terminal of the control module 107. The logic level conversion module 105 is used to convert one first voltage signal and / or the second voltage signal output by the switching output module 104 into a logic level signal output.

[0049] The second output terminal of the control module 107 is connected to the second input terminal of the display module 106. The control module 107 is used to determine the alarm signal type of the broadcast transmission system based on the logic level signal. The display module 106 is also used to display the number of fault frequencies of the broadcast transmission system.

[0050] The multiple channels can be 2, 3, or even 16. The preprocessing module 101 performs voltage conversion preprocessing on the shutdown alarm signal and / or main / standby switchover alarm signal of the multiple transmitting system to distinguish between the two alarm signals. The shutdown alarm signal of one broadcast transmitting system is converted into a first voltage signal by the preprocessing module 101, and the main / standby switchover alarm signal of another transmitting system is converted into a second voltage signal by the preprocessing module 101. Each first voltage signal and / or second voltage signal is aggregated and sent to the alarm signal input module 102. The alarm signal input module 102 can send each first voltage signal and / or second voltage signal to the output control logic module 103 after electrical isolation. The output logic control module 103 is controlled by the control module 107. A loop program code can cause the first output terminal of the control module 107 to output different binary codes as control signals. These codes sequentially select one input terminal and one output terminal of the output logic control module 103, and the selected output terminal outputs the first voltage signal and / or the second voltage signal to the switching output module 104 and the display module 106. The control terminal of the switching output module 104 is connected to the first output terminal of the control module 107. The switching output module 104 can select one input and one output terminal based on the control signal provided by the control module 107, i.e., outputting only one first voltage signal and / or second voltage signal, and sending it to the logic level conversion module 105. The logic level conversion module 105 distinguishes and processes the first voltage signal and / or second voltage signal, converting it into a logic level signal, which is then sent to the control module 107. The control module 107 can determine the alarm signal type of the broadcast transmission system based on the logic level signal. The control module 107 can utilize the GPIO interface of a microcontroller, etc., to implement the sequential output of multiple alarm signals through loop program code. The display module 106 can display the fault type and fault frequency of the broadcast transmission system.

[0051] The technical solution of this utility model embodiment includes a preprocessing module, an alarm signal input module, an output logic control module, an output switching module, a logic level conversion module, a display module, and a control module. The preprocessing module performs voltage conversion on multiple alarm signals, ensuring different types of alarm signals correspond to different voltage values. When alarm signals from multiple broadcast transmission systems are output cyclically, these signals are sequentially output to the display module, which displays the alarm signal and its type for each system. This allows for direct determination of the alarm fault type based on the displayed information. When a fault alarm occurs, on-duty personnel can promptly understand the fault type, saving time and enabling quick and effective emergency response. The control module's preset program cyclically scans the output of multiple alarm signals, ensuring that only one alarm signal passes through the alarm type determination device at any given time. This effectively avoids signal interference from simultaneous monitoring of multiple alarm signals, improving the device's accuracy. This solves the problem of on-duty and maintenance personnel not being able to intuitively and promptly understand the alarm type of a faulty transmission system. It enables multi-channel alarm signal monitoring, meeting the monitoring needs of more FM broadcast transmission systems.

[0052] Figure 2 This is a circuit diagram of the preprocessing unit provided in an embodiment of the present invention. In some optional embodiments of the present invention, the preprocessing module includes multiple preprocessing units, such as... Figure 2 As shown, the preprocessing unit includes a first resistor R1, a second resistor R2, a first voltage follower U1, a first diode D1, a third resistor R3, a fourth resistor R4, a second voltage follower U2, and a second diode D2.

[0053] The first end of the first resistor R1 is connected to the shutdown alarm signal of one transmission system. The second end of the first resistor R1 is connected to the positive input terminal of the first voltage follower U1 and the first end of the second resistor R2. The second end of the second resistor R2 is grounded. The negative input terminal of the first voltage follower U1 is connected to the output terminal of the first voltage follower U1. The output terminal of the first voltage follower U1 is also connected to the positive terminal of the first diode D1. The negative terminal of the first diode D1 is connected to the negative terminal of the second diode D2 and connected to one input terminal of the alarm signal input module.

[0054] The first end of the third resistor R3 is connected to the main / standby switchover alarm signal of one transmission system. The second end of the third resistor R3 is connected to the positive input terminal of the second voltage follower U2 and the first end of the fourth resistor R4. The second end of the fourth resistor R4 is grounded. The negative input terminal of the second voltage follower U2 is connected to the output terminal of the second voltage follower U2. The output terminal of the second voltage follower U2 is connected to the positive terminal of the second diode.

[0055] The preprocessing module includes multiple preprocessing units, each capable of differentiating between the shutdown alarm signal and the primary / standby switchover alarm signal of a single transmitting system. For example, the first voltage signal can be determined by setting the values ​​of the first resistor R1 and the second resistor R2. Assume that when the transmitter in the transmitting system is functioning normally, the alarm signal is 0. Assuming the initial alarm signal during a fault alarm is 5V, and both the first and second resistors are set to 10kΩ, when a shutdown alarm signal is triggered, the alarm signal is divided by the first resistor R1 and the second resistor R2 and output through the first voltage follower U1. At this time, the first voltage signal output by the first voltage follower U1 is 2.5V. Similarly, the third resistor R3 can be set to 10kΩ and the fourth resistor to 40kΩ. The primary / standby switchover alarm signal is divided by the third resistor R3 and the fourth resistor R4 and output through the second voltage follower U2. At this time, the second voltage signal output by the second voltage follower U2 is 4V. The outputs of the first voltage follower U1 and the second voltage follower U2 are isolated by diodes and then combined into a single input alarm signal input module.

[0056] Figure 3 This is a circuit diagram of the alarm signal input unit provided in this embodiment of the utility model. Figure 4 This is a circuit diagram of the alarm signal input module with 16 alarm signal inputs provided in this embodiment of the invention. The alarm signal input module includes a multi-channel alarm signal input unit. For example... Figure 3 and Figure 4 As shown, the alarm signal input unit includes a third diode D3 and a fifth resistor R5. The positive terminal of the third diode D3 is connected to an output terminal of the preprocessing module, and the negative terminal of the third diode D3 is connected to an input terminal of the output logic control module and the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is grounded.

[0057] The alarm signal input unit can isolate the first voltage signal and / or the second voltage signal from the preprocessing module via the third diode D3 and then output them to the output logic control module. For example... Figure 4 The circuit diagram of the alarm signal input module with 16 alarm signal inputs is shown. It includes 16 alarm signal input units, and the positive terminal of the third diode D3 of each channel is connected to the first voltage signal and / or the second voltage signal output by the preprocessing module.

[0058] Figure 5 This is a circuit diagram of the output logic control module for a single alarm signal input provided in this embodiment of the invention. The output logic control module includes a decoder and a multi-output logic control unit, such as... Figure 5As shown, the output logic control unit includes a first analog switch S1 and a first NOT gate N1; the first input terminal a1 of the first analog switch S1 is connected to an output terminal of the alarm signal input module, the output terminal b1 of the first analog switch S1 is connected to a first input terminal of the display module and an input terminal of the switching output module, the input terminal of the first NOT gate N1 is connected to the output terminal of the decoder, the output terminal d1 of the first NOT gate N1 is connected to the control terminal c1 of the first analog switch S1, and the input terminal of the decoder DEC is connected to the first output terminal of the control module.

[0059] The first analog switch S1 includes an input terminal a1, an output terminal b1, and a control terminal c1. When the control terminal c1 of the first analog switch S1 is set to logic 1, the input terminal a1 and the output terminal b1 are connected, and the signal at the input terminal a1 of the first analog switch S1 is output. The signal at the input terminal of the first analog switch S1 comes from an output terminal of the alarm signal input module. The decoder DEC can decode the binary code output from the first output terminal of the control module, and after decoding, control the first analog switch S1 to turn on or off, realizing the input scanning of alarm signals. For example, when an alarm is detected in a certain channel, the corresponding first switch module S1 outputs the alarm signal at the input terminal a1 from the output terminal b1, which is then sent to the display module and the switching output module respectively.

[0060] Continue to refer to Figure 5 In some optional embodiments of this utility model, the output logic control module further includes a first toggle switch SW1 and a first resistor array RP1. The first terminal f1 of the first toggle switch SW1 is connected to the control terminal c1 of the multi-channel first analog switch S1 and the first terminal f1 of the first resistor array RP1, respectively. The second terminal of the first resistor array RP1 is grounded. The second terminal e1 of the first toggle switch SW1 is connected to the output terminal d1 of the multi-channel first NOT gate N1. The first toggle switch SW1 is used to close the input terminal a1 and the output terminal b1 of the first analog switch S1 when the transmission system is normally powered off.

[0061] Figure 6 This is a circuit diagram of the output logic control module for 16-channel alarm signal input provided in this embodiment of the utility model, as shown below. Figure 6As shown, the output logic control module includes a decoder and a 16-channel output logic control unit. It also considers the scenario of normal transmitter shutdown. In this case, the first resistor array RP1 is a nine-pin resistor array, internally consisting of eight resistors of the same value packaged together. Pin 1 is the common terminal of the eight resistors, which is grounded. That is, one end of each of the eight packaged resistors in the array is grounded. The other end of each of the eight resistors in the first resistor array RP1 is connected to the first terminal f1 of the first toggle switch SW1 and to the control terminal c1 of the eight first analog switches S1. The second terminal e1 of the first toggle switch SW1 is connected to the output terminal d1 of the eight first NOT gates N1. When the transmitter is normally shut down, only the corresponding channel of the first toggle switch SW1 needs to be switched. When the first toggle switch SW1 is set to off, the control terminal c1 of the first analog switch S1 is logic 0, indicating an input / output disconnect state. Therefore, the alarm signal will not be sent to the display module and the output switching module. When the first toggle switch SW1 is set to the ON state, the first analog switch S1 will receive control from the decoder DEC to normally realize the channel switching. Specifically, terminals A, B, C, and E1 of each decoder DEC are connected to the first output terminal of the control module, terminals E2 and E3 of each decoder DEC are grounded, and terminals Y0-Y7 of each decoder DEC are connected to the input terminals of the 8-channel first NOT gate N1.

[0062] Figure 7 This is a circuit schematic diagram of the switching output module provided in an embodiment of this utility model, as shown below. Figure 7 As shown, the switching output module includes a second analog switch S2 and a sixth resistor R6. The input terminal of the second analog switch S2 is connected to the output terminal of the output logic control module in a one-to-one correspondence. The control terminal of the second analog switch S2 is connected to the first terminal of the control module. The output terminal of the second analog switch S2 is connected to the first terminal of the sixth resistor R6 and the input terminal of the logic level conversion module, respectively. The second terminal of the sixth resistor R6 is grounded.

[0063] The output switching module includes a second analog switch S2, which may have multiple input terminals. These input terminals are connected one-to-one with the output terminals of the output logic control module. The control terminal of the second analog switch S2 is connected to the first terminal of the control module. The first terminal of the control module outputs different binary codes as control signals through a loop program code. The second analog switch S2 can select one input terminal and one output terminal based on the control signal provided by the control module 107, that is, select one input signal from the multiple input terminals and output it to the logic level conversion module. The sixth resistor R6 is the load resistor of the output switching module and also acts as a pull-down resistor, ensuring that this point is controlled at 0V when all transmitters are working normally.

[0064] Figure 8 This is a circuit diagram of the switching output module for 16-channel alarm signal input provided in this embodiment of the utility model, as shown below. Figure 8 As shown, each second analog switch S2 has 8 signal input terminals (X0-X7), and each second analog switch S2 input comes from the output logic control module. Terminals A, B, C, and E1 of the two second analog switches S2 are connected to the first output terminal of the control module. The first output terminal of the control module cyclically outputs 16 codes to control the channel output of each second analog switch S2. The second NOT gate N2 is used for chip select control of the two second analog switches S2. Terminals A, B, C, and E1 of the second analog switch S2 control one of the 8 signal input terminals (X0-X7) to connect to the output terminal X, thereby achieving the switching output of 16 signals and sending the output alarm signal to the logic level conversion module.

[0065] Figure 9 This is a circuit schematic diagram of the logic level conversion module provided in this embodiment of the utility model, as shown below. Figure 9 As shown, the logic level conversion module includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first comparator COM1, a first OR gate, a tenth resistor R10, an eleventh resistor R11, a second comparator COM2, a twelfth resistor R12, and a first buffer BUF.

[0066] The first terminal of the seventh resistor R7 is connected to the power supply signal Vd, the second terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8, the second terminal of the eighth resistor R8 is grounded, the negative input terminal of the first comparator COM1 is connected to the second terminal of the seventh resistor R7, the positive input terminal of the first comparator COM1 is connected to the output terminal of the switching output module, the power supply terminal of the first comparator COM1 is connected to the power supply signal Vd, the ground terminal of the first comparator COM1 is grounded, the output terminal of the first comparator COM1 is connected to the first input terminal of the first OR gate, the first terminal of the ninth resistor R9 is connected to the power supply terminal of the first comparator COM1, the second terminal of the ninth resistor R9 is connected to the output terminal of the first comparator COM1, and the output terminal of the first comparator COM1 is connected to the first input terminal of the first OR gate.

[0067] The first terminal of the tenth resistor R10 is connected to the power supply signal Vd. The second terminal of the tenth resistor R10 is connected to the first terminal of the eleventh resistor R11. The second terminal of the eleventh resistor R11 is grounded. The positive input terminal of the second comparator COM2 is connected to the switching output module. The negative input terminal of the second comparator COM2 is connected to the second terminal of the tenth resistor R10. The power supply terminal of the second comparator COM2 is connected to the power supply signal Vd. The ground terminal of the second comparator COM2 is grounded. The first terminal of the twelfth resistor R12 is connected to the power supply terminal of the second comparator COM2. The output terminal of the second comparator COM2 is connected to the second terminal of the twelfth resistor R12, the second input terminal of the first OR gate, and the positive terminal of the first buffer BUF. The negative terminal of the first buffer BUF is connected to the first input terminal of the control module. The output terminal of the first OR gate is connected to the first input terminal of the control module.

[0068] In this circuit, the first terminal of the seventh resistor R7 is connected to the power signal Vd. The seventh resistor R7 and the eighth resistor R8 can divide the power signal Vd to obtain the comparison threshold for the shutdown alarm, i.e., the first threshold voltage value. Similarly, the tenth resistor R10 and the eleventh resistor R11 can also divide the power signal Vd to obtain the comparison threshold for the master / slave switchover alarm, i.e., the second threshold voltage value. The ninth resistor R9 and the twelfth resistor R12 are pull-up resistors to maintain the normal operation of the two comparators. The input signal of the logic level conversion module comes from the output signal of the switching output module. The first voltage signal and / or the second voltage signal from the switching output module are respectively sent to the positive input terminals of the first comparator COM1 and the second comparator COM2, and compared with the threshold voltage values ​​at the negative input terminals of the two comparators. If the output of the first OR gate is logic 0, it indicates that the transmitting system is normal. If the outputs of the first comparator COM1 and the second comparator COM2 are both logic 0, it means that the alarm signals have not exceeded the threshold voltages set by the two comparators. If the alarm signal exceeds the first threshold voltage value set by the first comparator COM1, the first comparator COM2 outputs a high level, indicating that a shutdown alarm has occurred at a certain frequency. If the alarm signal exceeds the second threshold voltage value set by the second comparator COM2, the second comparator COM2 will also output a high level, indicating that a master / slave switchover alarm has occurred at a certain frequency. The outputs of the first comparator COM1 and the second comparator COM2 are fed into the first OR gate. If the output of the first OR gate is logic 1, it indicates that a fault has occurred. At the same time, the output of the first OR gate is connected to the first input of the control module. The output of the second comparator COM2 is fed into the second input of the control module after passing through the first buffer BUF. If the output of the first input of the control module is logic 1, it indicates that an alarm signal has been detected. If the output of the first buffer BUF is logic 0, it indicates that the fault is a shutdown alarm signal. If it is logic 1, it indicates that a master / slave switchover alarm signal has occurred.

[0069] For example, the resistance values ​​of the seventh resistor R7 and the eighth resistor R8 can be set to divide the power signal Vd. For instance, if the power signal Vd is 5V, setting the resistance of the seventh resistor R7 to 10 kΩ and the resistance of the eighth resistor R8 to 5 kΩ will result in a first threshold voltage of approximately 1.67V. Similarly, the resistance values ​​of the tenth resistor R10 and the eleventh resistor R11 can be set to divide the power signal Vd. Setting the resistance of the tenth resistor R10 to 10 kΩ and the resistance of the eleventh resistor R11 to 20 kΩ will result in a second threshold voltage of approximately 3.3V. The first voltage signal corresponding to the shutdown alarm signal output by the preprocessing module is 2.5V, and the second voltage signal corresponding to the main / standby switchover signal is 4V. When the first and second voltage signals are input to the first comparator COM1, the output of the first comparator COM1 is high. The first and second voltage signals are input to the positive input of the second comparator COM2. The second comparator COM2 will only output a high level when the second voltage signal is input. If no fault alarm occurs, the outputs of the first comparator COM1 and the second comparator COM2 are both low, and the output of the first OR gate is logic 0, indicating that the transmitting system is normal. If a shutdown alarm or a master / slave switchover alarm occurs, at least one of the first comparator COM1 and the second comparator COM2 will output a high level, and the output of the first OR gate will be logic 1, indicating that there is an alarm signal. At this time, it is necessary to judge based on the output of the first buffer BUF. If the output of the first buffer BUF is logic 0, it means that the fault is a shutdown alarm signal. If it is logic 1, it means that the fault is a master / slave switchover alarm signal.

[0070] In some optional embodiments of this utility model, the display module includes a multi-channel computer room alarm unit and a remote alarm counting unit. Each input terminal of the computer room alarm unit is connected to each output terminal of the output logic control module in a one-to-one correspondence. The computer room alarm unit is used to trigger an alarm based on the first voltage signal and / or the second voltage signal output by the output logic control module. The input terminal of the remote alarm counting unit is connected to the second output terminal of the control module. The remote alarm counting unit is used to display the number of fault frequencies of the broadcast transmission system.

[0071] Figure 10 This is a circuit diagram of the computer room alarm unit provided in an embodiment of this utility model. In some optional embodiments of this utility model, such as... Figure 10As shown, the computer room alarm unit includes a third voltage follower U3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a third comparator COM3, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a fourth comparator COM4, ​​a first NOR gate, a third NOT gate N3, a first latch UN1, a reset button S3, a nineteenth resistor R19, a first light-emitting diode LED1, a twentieth resistor R20, a fourth NOT gate N4, a second latch UN2, a second light-emitting diode LED2, and a twenty-first resistor R21.

[0072] The positive input of the third voltage follower U3 is connected to one output of the output logic control module. The negative input of the third voltage follower U3 is connected to its output. The power supply terminal of the third voltage follower U3 is connected to the power signal Vd. The ground terminal of the third voltage follower U3 is grounded. The output of the third voltage follower U3 is also connected to the positive input of the third comparator COM3 and the positive input of the fourth comparator COM4. The first terminal of the thirteenth resistor R13 is connected to the power signal Vd. The second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth resistor R14. The second terminal of the fourteenth resistor R14 is grounded. The negative input of the third comparator COM3 is connected to the second terminal of the thirteenth resistor R13. The power supply terminal of comparator COM3 is connected to the power signal Vd. The ground terminal of the third comparator COM3 is grounded. The output terminal of the third comparator COM3 is connected to the first input terminal of the first NOR gate and the first terminal of the fifteenth resistor R15. The second terminal of the fifteenth resistor R15 is connected to the power supply terminal of the third comparator COM3. The first terminal of the sixteenth resistor R16 is connected to the power signal Vd. The second terminal of the sixteenth resistor R16 is connected to the first terminal of the seventeenth resistor R17. The second terminal of the seventeenth resistor R17 is grounded. The negative input terminal of the fourth comparator COM4 is connected to the second terminal of the sixteenth resistor R16. The output terminal of the fourth comparator COM4 is connected to the first terminal of the eighteenth resistor R18 and the second terminal of the first NOR gate. The input terminal is connected to the input terminal of the fourth NOT gate N4. The second terminal of the eighteenth resistor R18 is connected to the power supply terminal of the fourth comparator COM4. The output terminal of the first NOR gate is connected to the input terminal of the third NOT gate N3. The output terminal of the third NOT gate N3 is connected to the first terminal S of the first latch UN1. The second terminal D of the first latch UN1 is grounded. The third terminal CLK of the first latch UN1 is connected to the first terminal of the reset button S3 and the first terminal of the nineteenth resistor R19. The second terminal of the reset button S3 is connected to the power signal Vd. The second terminal of the nineteenth resistor R19 is grounded. The fourth terminal R of the first latch UN1 is connected to the power signal Vd. The fifth terminal Q of the first latch UN1 is connected to the negative terminal of the first light-emitting diode LED1. The positive terminal of the first light-emitting diode LED1 is connected to the first end of the twentieth resistor R20, and the second end of the twentieth resistor R20 is connected to the power signal Vd. The output terminal of the fourth NOT gate N4 is connected to the first terminal S of the second latch UN2. The second terminal D of the second latch UN2 is grounded. The third terminal CLK of the second latch UN2 is connected to the first terminal of the reset button S3 and the first end of the nineteenth resistor R19. The fourth terminal R of the second latch UN2 is connected to the power signal Vd. The fifth terminal Q of the second latch UN2 is connected to the negative terminal of the second light-emitting diode LED2. The positive terminal of the second light-emitting diode LED is connected to the first end of the twenty-first resistor R21, and the second end of the twenty-first resistor R21 is connected to the power signal Vd.

[0073] In this circuit, the first terminals of the thirteenth resistor R13 and the sixteenth resistor R16 are both connected to the power signal Vd. The thirteenth resistor R13 and the fourteenth resistor R14 can divide the power signal Vd to obtain the comparison threshold for the shutdown alarm, i.e., the first comparison threshold. Similarly, the sixteenth resistor R16 and the seventeenth resistor R17 can also divide the power signal Vd to obtain the comparison threshold for the master / slave switchover alarm, i.e., the second comparison threshold. The nineteenth resistor R19 is a pull-down resistor for the alarm reset circuit, which can set the reset terminals of the first latch UN1 and the second latch UN2 to logic 0. The twentieth resistor R20 and the twenty-first resistor R21 are current-limiting resistors for the alarm lights. The fifteenth resistor R15 and the eighteenth resistor R18 are pull-up resistors that maintain the normal operation of the third comparator COM3 and the fourth comparator COM4. The alarm signal of the computer room alarm unit comes from the output of the output logic control module. The third voltage follower U3 isolates the alarm signal and enhances its load-carrying capacity. After passing through U3, the signal is fed to the positive inputs of the third comparator COM3 and the fourth comparator COM4, ​​and compared with their negative inputs. If the alarm signal exceeds the comparison threshold, the comparator outputs logic 1; otherwise, it outputs logic 0. The outputs of the third comparator COM3 and the fourth comparator COM4 are fed together into the first NOR gate. When the first NOR gate outputs logic 1, it indicates a shutdown alarm; when it outputs logic 0, it indicates no fault signal or a master / slave switchover alarm signal. When the first NOR gate outputs logic 1, it triggers the first latch UN1 to illuminate the first LED (LED1), indicating a shutdown fault alarm. When the fourth comparator COM4 outputs logic 1, it triggers the second latch UN2 to illuminate the second LED (LED2), indicating a master / slave switchover alarm. The reset button S3 is a manual reset switch. After the operator confirms the fault, they can press this switch to turn off the fault light.

[0074] For example, the resistance values ​​of the thirteenth resistor R13 and the fourteenth resistor R14 can be set to divide the power supply signal Vd. For instance, if the power supply signal Vd can be 5V, setting the resistance value of the thirteenth resistor R13 to 10 kΩ and the resistance value of the fourteenth resistor R14 to 5 kΩ will result in a first comparison threshold of approximately 1.67V. Similarly, the resistance values ​​of the sixteenth resistor R16 and the seventeenth resistor R17 can be set to divide the power supply signal Vd. Setting the resistance value of the sixteenth resistor R16 to 10 kΩ and the resistance value of the seventeenth resistor R17 to 20 kΩ will result in a second comparison threshold of approximately 3.3V. The outputs of the third comparator COM3 and the fourth comparator COM4 are fed together into the first NOR gate. That is, when the output of the first NOR gate is logic 1, it indicates that a shutdown alarm has occurred; when the output of the first NOR gate is logic 0, it indicates that there is no fault signal or that a master / slave switchover alarm signal has occurred. When the output of the first NOR gate is logic 1, it triggers the first latch UN1 to light up the first LED1, which is the shutdown fault alarm light. When the output of the fourth comparator COM4 is logic 1, it triggers the second latch UN2 to light up the second LED2, which is the master / slave switchover alarm light.

[0075] Figure 11 This is a circuit diagram of the remote alarm counting unit provided in an embodiment of this utility model. In some optional embodiments of this utility model, such as... Figure 11 As shown, the remote alarm counting unit includes a digital tube, a first D-trigger latch, and a second D-trigger latch. The first terminals of both the first and second D-trigger latches are connected to the second output terminal of the control module. The second terminal of the first D-trigger latch is connected to the first terminal of the digital tube. The third terminal of the first D-trigger latch is grounded. The second terminal of the second D-trigger latch is connected to the second terminal of the digital tube. The third terminal of the second D-trigger latch is grounded.

[0076] The remote alarm counting unit includes a first D-trigger latch U17 and a second D-trigger latch U18 for the digital tube. The Q0-Q7 terminals of the first D-trigger latch U17 can drive the ah field of the digital tube, and the Q0-Q1 terminals of the second D-trigger latch U18 can drive bits 1-2 of the digital tube. The D0-D7 terminals of the first D-trigger latch U17 and the second D-trigger latch U18 are derived from the second output terminal of the control module.

[0077] Figure 12 This is a circuit schematic diagram of the control module provided in an embodiment of this utility model, as shown below. Figure 12The control module of the alarm type judgment device in the broadcast transmission system shown can be controlled and coordinated by a microcontroller. The microcontroller's P1.0-P1.3 pins are the first output pins of the control module. The microcontroller uses an internal embedded program to cyclically output binary codes from P1.0-P1.3. For example, when alarm signal number 16 is input, it can cyclically output binary codes from 0000 to 1111 to drive the decoder of the 16-channel alarm signal output control logic module. XT1, connected between XTAL1 and XTAL2, is a necessary alarm oscillator for the microcontroller's operation. C1 and C2 are bypass capacitors for interference suppression. The microcontroller's P0.0-P0.7 pins are the second output pins of the control module, which can be connected to a remote alarm counting unit to display the current number of faults. The RP3 is a nine-pin resistor array. Its internal structure encapsulates eight resistors of the same resistance value together. One pin serves as the common terminal for all eight resistors, which is connected to either power or ground. In other words, one end of each of the eight packaged resistors is connected to either power or ground, while the other ends can be connected to other circuits. For example... Figure 12 As shown, one end of each of the eight packaged resistors in the resistor array is connected to a power supply signal, which can be 5V. The P2.0 pin of the microcontroller is the first input pin of the control module, used to determine the fault type. The signal comes from the output of the first OR gate of the logic level conversion module. Simultaneously, the output of the first OR gate of the logic level conversion module is also connected to the P3.2 pin of the microcontroller. When the P2.0 pin of the microcontroller is at logic 1, the fault flag bit is set, triggering the microcontroller's first-level interrupt program to handle remote fault reporting and remote alarm counting. The P2.1 pin of the microcontroller is the fault nature judgment flag bit, and this signal comes from the output of the first buffer BUF of the alarm signal logic level conversion section. When the P2.1 pin of the microcontroller is at logic 1, it indicates that a transmitter has experienced a master / slave switchover; if it is at logic 0, it indicates that a transmitter has been shut down. Pins P3.6 and P3.7 are the control signals for the first and second D-trigger latches of the remote alarm counting unit, used to control the digits and fields displayed on the two-digit LED display.

[0078] This utility model's technical solution enables multi-channel alarm monitoring, meeting the monitoring needs of all FM broadcasting systems nationwide. It employs a cyclic scanning output mode. Through a preset program in the control module, the alarm channel outputs are cyclically scanned, ensuring that only one alarm signal passes through the entire alarm at any given time. This effectively avoids signal interference that can occur with simultaneous monitoring of multiple alarm signals, improving the alarm's accuracy. Channel switching time is precisely controllable, with timing achieved by a microcontroller program controlling the oscillation frequency generated by a crystal oscillator. Compared to typical delay circuits primarily composed of RC circuits, this improves timing accuracy, and the relevant time parameters can be adjusted later according to actual needs. Due to the use of a programmable control module, the hardware circuit size is reduced, conforming to modern efficient and compact circuit design principles. In the event of a fault, on-duty personnel can quickly determine the fault type, providing a basis for subsequent fault handling.

[0079] The working principle of this utility model's technical solution is referenced. Figures 1-12Taking 16 alarm signals as an example, the alarm type judgment device of the broadcast transmission system uses control module 107 as the control core. Preprocessing module 101 performs voltage conversion on the 16-channel power-off alarm signals and main / standby switchover signals of the transmission system. One power-off alarm signal is converted into a first voltage signal, and one main / standby switchover alarm signal is converted into a second voltage signal. For example, if the transmission system is working normally and there are no alarm signals, the preprocessing module 101 outputs 0V; when the transmission system has a power-off alarm, the preprocessing module outputs 2.5V; when the transmission system has a main / standby switchover alarm signal, the preprocessing module outputs 4V. The alarm signals are isolated and processed by alarm signal input module 102 and then sent to output logic control module 103. Output logic control module 103 is controlled by control module 107, which outputs 16 different four-bit binary codes through a loop program code. These codes drive 16 decoders, causing the decoders to cyclically output the 16 alarm signals. When an alarm occurs in the transmission system, the output of the output logic control module 103 will drive the local alarm unit of the display module 106 in the equipment room to distinguish the alarm signal and illuminate the corresponding alarm light. Simultaneously, the alarm signal output by the output logic control module 103 is sent to the switching output module 104. The switching output module 104 can select one alarm signal from the 16 alarm signals (based on 16 different four-bit binary codes output by the control module 107) and send it to the logic level conversion module 105. The logic level conversion module 105 distinguishes and processes the alarm signal, converts it into a logic level, and sends it to the input of the control module 107. The control module 107 performs corresponding processing based on the characteristics of the input signal. When any transmitter in the broadcast transmission system experiences an abnormal shutdown or a main / standby switchover, the alarm type judgment device of the broadcast transmission system will indicate the frequency and nature of the fault to the operator via indicator lights in the local unit of the display module in the equipment room. Simultaneously, the fault frequency and nature are sent to and displayed on the host computer in the central control room via the communication interface of the control module. After the host computer display shows the fault frequency and nature normally, the control module will drive the counter of the remote alarm counting unit and display the current frequency of faults. The indicator lights of the local alarm unit in the computer room are cleared by the operator via the local reset button after confirming the fault. Similarly, the fault information on the host computer is manually cleared by the operator after confirmation.

[0080] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An alarm type determination device for a broadcast transmission system, characterized in that, The alarm type determination device for a multi-channel broadcast transmission system includes a preprocessing module, an alarm signal input module, an output logic control module, a switching output module, a logic level conversion module, a display module, and a control module. Each first input terminal of the preprocessing module is connected to a shutdown alarm signal of a broadcast transmission system, and each second input terminal of the preprocessing module is connected to a main / backup switchover alarm signal of the broadcast transmission system. The preprocessing module is used to convert the shutdown alarm signal of each broadcast transmission system into a first voltage signal and to convert the main / backup switchover alarm signal of each transmission system into a second voltage signal. Each input terminal of the alarm signal input module is connected to each output terminal of the preprocessing module in a one-to-one correspondence. Each output terminal of the alarm signal input module is connected to each input terminal of the output logic control module. Each first voltage signal and / or second voltage signal is output to the output logic control module after being electrically isolated by the alarm signal input module. The control terminal of the output logic control module is connected to the first output terminal of the control module. Each output terminal of the output logic control module is connected to each input terminal of the switching output module and each first input terminal of the display module in a one-to-one correspondence. The output logic control module is used to sequentially select one input terminal and one output terminal of the output logic control module according to the control signal provided by the control module. The display module is used to determine the alarm signal type of each broadcast transmission system according to the output terminal of the output logic control module. The control terminal of the switching output module is connected to the first output terminal of the control module. The output terminal of the switching output module is connected to the input terminal of the logic level conversion module. The switching output module is used to select one input terminal and one output terminal of the switching output module according to the control signal provided by the control module. The output terminal of the logic level conversion module is connected to the first input terminal of the control module. The logic level conversion module is used to convert one of the first voltage signals and / or the second voltage signals output by the switching output module into logic level signals for output. The second output terminal of the control module is connected to the second input terminal of the display module, and the control module is used to determine the alarm signal type of the broadcast transmission system according to the logic level signal. The display module is also used to display the number of fault frequencies of the broadcast transmission system.

2. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The preprocessing module includes a multi-channel preprocessing unit, which includes a first resistor, a second resistor, a first voltage follower, a first diode, a third resistor, a fourth resistor, a second voltage follower, and a second diode. The first end of the first resistor is connected to a power-off alarm signal of the transmitting system. The second end of the first resistor is connected to the positive input terminal of the first voltage follower and the first end of the second resistor. The second end of the second resistor is grounded. The negative input terminal of the first voltage follower is connected to the output terminal of the first voltage follower. The output terminal of the first voltage follower is also connected to the positive terminal of the first diode. The negative terminal of the first diode is connected to the negative terminal of the second diode and is connected to an input terminal of the alarm signal input module. The first end of the third resistor is connected to a primary / backup switchover alarm signal of the transmitting system. The second end of the third resistor is connected to the positive input terminal of the second voltage follower and the first end of the fourth resistor. The second end of the fourth resistor is grounded. The negative input terminal of the second voltage follower is connected to the output terminal of the second voltage follower. The output terminal of the second voltage follower is connected to the positive terminal of the second diode.

3. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The alarm signal input module includes a multi-channel alarm signal input unit, which includes a third diode and a fifth resistor. The positive terminal of the third diode is connected to an output terminal of the preprocessing module, and the negative terminal of the third diode is connected to an input terminal of the output logic control module and a first terminal of the fifth resistor. The second terminal of the fifth resistor is grounded.

4. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The output logic control module includes a decoder and a multi-output logic control unit. The output logic control unit includes a first analog switch and a first NOT gate. The input terminal of the first analog switch is connected to an output terminal of the alarm signal input module. The output terminal of the first analog switch is connected to a first input terminal of the display module and an input terminal of the switching output module. The input terminal of the first NOT gate is connected to the output terminal of the decoder. The output terminal of the first NOT gate is connected to the control terminal of the first analog switch. The input terminal of the decoder is connected to the first output terminal of the control module.

5. The alarm type determination device for a broadcast transmission system according to claim 4, characterized in that, The output logic control module further includes a first toggle switch and a first resistor array. The first end of the first toggle switch is connected to the control terminal of the multiple first analog switches and the first end of the first resistor array, respectively. The second end of the first resistor array is grounded. The second end of the first toggle switch is connected to the output terminal of the multiple first NOT gate. The first toggle switch is used to close the input and output terminals of one first analog switch when one transmission system is normally powered off.

6. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The switching output module includes a second analog switch and a sixth resistor. The input terminal of the second analog switch is connected to the output terminal of the output logic control module in a one-to-one correspondence. The control terminal of the second analog switch is connected to the first terminal of the control module. The output terminal of the second analog switch is connected to the first terminal of the sixth resistor and the input terminal of the logic level conversion module, respectively. The second terminal of the sixth resistor is grounded.

7. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The logic level conversion module includes a seventh resistor, an eighth resistor, a ninth resistor, a first comparator, a first OR gate, a tenth resistor, an eleventh resistor, a second comparator, a twelfth resistor, and a first buffer; The first end of the seventh resistor is connected to the power signal, the second end of the seventh resistor is connected to the first end of the eighth resistor, the second end of the eighth resistor is grounded, the negative input terminal of the first comparator is connected to the second end of the seventh resistor, the positive input terminal of the first comparator is connected to the output terminal of the switching output module, the power supply terminal of the first comparator is connected to the power signal, the ground terminal of the first comparator is grounded, the output terminal of the first comparator is connected to the first input terminal of the first OR gate, and the first end of the ninth resistor is connected to the power supply terminal of the first comparator, the second end of the ninth resistor is connected to the output terminal of the first comparator. The first end of the tenth resistor is connected to the power signal, the second end of the tenth resistor is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is grounded, the positive input of the second comparator is connected to the switching output module, the negative input of the second comparator is connected to the second end of the tenth resistor, the power supply terminal of the second comparator is connected to the power signal, the ground terminal of the second comparator is grounded, the first end of the twelfth resistor is connected to the power supply terminal of the second comparator, the output of the second comparator is connected to the second end of the twelfth resistor, the second input of the first OR gate, and the positive terminal of the first buffer, respectively, the negative terminal of the first buffer is connected to the first input terminal of the control module, and the output of the first OR gate is connected to the first input terminal of the control module.

8. The alarm type determination device for a broadcast transmission system according to claim 1, characterized in that, The display module includes a multi-channel computer room alarm unit and a remote alarm counting unit. Each input terminal of the computer room alarm unit is connected to each output terminal of the output logic control module. The computer room alarm unit is used to trigger an alarm based on the first voltage signal and / or the second voltage signal output by the output logic control module. The input terminal of the remote alarm counting unit is connected to the second output terminal of the control module. The remote alarm counting unit is used to display the number of fault frequencies of the broadcast transmission system.

9. The alarm type determination device for a broadcast transmission system according to claim 8, characterized in that, The computer room alarm unit includes a third voltage follower, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third comparator, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourth comparator, a first NOR gate, a third NOT gate, a first latch, a reset button, a nineteenth resistor, a first LED, a twentieth resistor, a fourth NOT gate, a second latch, a second LED, and a twenty-first resistor; The positive input terminal of the third voltage follower is connected to one output terminal of the output logic control module, the negative input terminal of the third voltage follower is connected to its output terminal, the power supply terminal of the third voltage follower is connected to a power signal, the ground terminal of the third voltage follower is grounded, the output terminal of the third voltage follower is also connected to the positive input terminals of the third comparator and the fourth comparator, respectively, the first terminal of the thirteenth resistor is connected to the power signal, the second terminal of the thirteenth resistor is connected to the first terminal of the fourteenth resistor, the second terminal of the fourteenth resistor is grounded, and the negative input terminal of the third comparator is connected to the first terminal of the thirteenth resistor. The third comparator has two terminals connected: its power supply terminal is connected to a power signal, its ground terminal is grounded, its output terminal is connected to the first input terminal of the first NOR gate and the first terminal of the fifteenth resistor, the second terminal of the fifteenth resistor is connected to the power supply terminal of the third comparator, the first terminal of the sixteenth resistor is connected to a power signal, the second terminal of the sixteenth resistor is connected to the first terminal of the seventeenth resistor, the second terminal of the seventeenth resistor is grounded, the negative input terminal of the fourth comparator is connected to the second terminal of the sixteenth resistor, and its output terminal is connected to the first terminal of the eighteenth resistor, the first NOR gate ... The second input terminal of the NOT gate is connected to the input terminal of the fourth NOT gate; the second terminal of the eighteenth resistor is connected to the power supply terminal of the fourth comparator; the output terminal of the first NOR gate is connected to the input terminal of the third NOT gate; the output terminal of the third NOT gate is connected to the first terminal of the first latch; the second terminal of the first latch is grounded; the third terminal of the first latch is connected to the first terminal of the reset button and the first terminal of the nineteenth resistor; the second terminal of the reset button is connected to the power signal; the second terminal of the nineteenth resistor is grounded; the fourth terminal of the first latch is connected to the power signal; and the fifth terminal of the first latch is connected to the first light-emitting diode. The negative terminal of the first LED is connected to the negative terminal of the second LED. The positive terminal of the first LED is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the power signal. The output terminal of the fourth NOT gate is connected to the first end of the second latch. The second end of the second latch is grounded. The third end of the second latch is connected to the first end of the reset button and the first end of the nineteenth resistor. The fourth end of the second latch is connected to the power signal. The fifth end of the second latch is connected to the negative terminal of the second LED. The positive terminal of the second LED is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the power signal.

10. The alarm type determination device for a broadcast transmission system according to claim 8, characterized in that, The remote alarm counting unit includes a digital tube, a first D-trigger latch, and a second D-trigger latch. The first terminals of the first D-trigger latch and the second D-trigger latch are both connected to the second output terminal of the control module. The second terminal of the first D-trigger latch is connected to the first terminal of the digital tube. The third terminal of the first D-trigger latch is grounded. The second terminal of the second D-trigger latch is connected to the second terminal of the digital tube. The third terminal of the second D-trigger latch is grounded.

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