Medium wave transmitter on-site monitoring display device

Abstract

The utility model discloses on-site monitoring display equipment for a medium wave transmitter, which is mainly used for monitoring incoming audio and idle audio in real time on the transmitter. The LED display device comprises a buffer isolation circuit, a blocking capacitor, an LED display module, a demodulation detection circuit, a monitoring change-over switch, an audio power amplifier, a loudspeaker, a main power supply, a main switch and a 3.3 V voltage stabilizing circuit. Technically, an LED display module is utilized, and the corresponding LED module is driven to emit light for display through input incoming audio and idle audio. Therefore, the real-time states of the incoming audio and the idle audio are monitored. According to the utility model, 35 seconds can be saved during fault judgment, and the operation index of safe broadcasting is greatly improved. The maintenance work efficiency is improved, the judgment time of emergency repair is shortened, and the problem that the existing monitoring system of the medium wave table cannot monitor incoming audio and idle audio on site is solved.

Description

Technical Field

[0001] The utility model relates to a medium wave transmitter monitoring and display device, in particular to a field monitoring and display device for input signals and empty received signals of a medium wave transmitter. Background Art

[0002] The Shanghai Guang TSD-10 medium wave transmitter is a medium wave transmitter widely used by medium wave stations. According to the "TSD-10 Medium Wave All-Solid State Digital AM Transmitter Technical Specification" standard revised by Shanghai Mingzhu Broadcasting and Television Technology Co., Ltd., the Shanghai Guang TSD-10 medium wave transmitter lacks the monitoring and display function of the incoming audio and output AM signals. Once it is separated from the digital audio monitoring system in the control room, it is impossible to confirm the broadcast status of the transmission system on site in the first time, which may delay emergency response and cause a broadcast suspension accident.

[0003] To determine whether the audio transmission system is faulty, it is necessary to monitor the output signal at the end of the system to confirm the status of the incoming audio. However, the digital monitoring system ignores the monitoring of this key node and only monitors the front-end signal source through the audio switch, resulting in the inability to directly determine the status of the incoming audio and the inability to quickly determine the fault, which increases the emergency processing time and affects safe broadcasting.

[0004] The on-site monitoring function is missing, and the monitoring of the medium wave station signal is limited to the control room. The transmitter room separated from it lacks equipment to assist monitoring. This means that when inspecting, debugging and troubleshooting, at least two technicians are required to work together in the control room and the transmitter room, respectively, to debug through walkie-talkies to monitor the quality of the received audio. Not only is communication poor, it increases the risk of incorrect command transmission between the site and the control console; it is also time-consuming and labor-intensive, reducing efficiency.

[0005] This makes it necessary to further improve the on-site monitoring system of the medium wave transmitter in terms of technical support measures and means. Summary of the invention

[0006] The technical problem solved by the utility model is: in order to solve the problem that the existing monitoring system of the medium wave station cannot monitor the incoming audio and the unreceived audio on site, the utility model provides a medium wave incoming signal and modulated wave signal monitoring and display device that can be both externally mounted and movable. On the transmitter, the incoming audio and the unreceived audio are monitored in real time, improving the on-site fault handling capability and maintenance efficiency, and better achieving the "uninterrupted, high-quality, economical and safe" broadcasting goal.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] The invention discloses a field monitoring display device for a medium wave transmitter, which is composed of a buffer isolation circuit, a DC isolation capacitor, an LED display module, a demodulation detection circuit, a monitoring switching switch, an audio power amplifier, a loudspeaker, a main power supply, a main switch and a 3.3V voltage stabilizing circuit.

[0009] The utility model sends the incoming audio signal to the buffer isolation circuit for sampling at the audio input end of the transmitter external interface board; demodulates and detects the empty received amplitude modulation signal through the demodulation detection circuit to obtain the empty received audio signal for sampling; introduces the above two sampling signals into the LED display module and the monitoring switch. The monitoring switch then passes through the audio power amplifier and the speaker to realize the monitoring and display function of the incoming audio signal and the empty received audio signal.

[0010] The utility model adopts a 2600mAh +5V lithium battery pack as the main power supply, plus a 3.3V voltage regulator circuit to supply the demodulation detection circuit. Once the main power of the utility model is turned on, the LED display module will work and display in real time. The opening of the monitoring module is controlled by the monitoring switch.

[0011] The connection relationship of the utility model (see attached Figure 1 ):

[0012] The incoming audio signal 10 is connected to the input end of the buffer isolation circuit 1 through the signal transmission line. The output end of the buffer isolation circuit 1 is divided into two paths, one of which is connected to the DC isolation capacitor 2, and then connected to the signal input end of the LED display module 3 through the isolation capacitor 2, and the other is connected to the input end of the audio monitoring switch 5; the output end of the demodulation detection circuit 4 is divided into two paths, one of which is connected to the input end of the LED display module 3, and the other is connected to the input end of the monitoring switch 5; the output end of the monitoring switch 5 is connected to the input end of the audio power amplifier 6 for audio amplification, and the output end of the audio power amplifier is connected to the input end of the speaker 7 for monitoring.

[0013] In the power supply part, the positive end of the main power supply 8 is connected to the input end of the main switch 9, and the output end of the main switch 9 is divided into two paths. One path is connected to the 3.3V voltage regulator circuit 14 to stabilize the voltage at 3.3VDC, and the output end of the voltage regulator circuit 14 is connected to the positive power input end of the demodulation detection circuit 4, and the other path is connected to the positive power input end of the LED display module 3 and the audio amplifier 6. The negative end of the main power supply 8 is connected to the negative power input end of each power module to form a power supply loop.

[0014] The buffer isolation circuit 1 is used to isolate input and output signals, eliminate crosstalk between signals, and improve the anti-interference capability of the system.

[0015] The DC blocking capacitor 2 is used to block the DC signal. A 22uF capacitor can be used, but is not limited to this model.

[0016] LED display module 3 drives the corresponding LED module to emit light and display through the input of incoming audio and received audio. So as to monitor the real-time status of incoming audio and received audio. It can adopt 5V power supply, dual-channel audio, vu212P-2805S, but not limited to this model.

[0017] The demodulation detection circuit 4 demodulates and detects the received signals of the full frequency band of the medium wave by adjusting the adjustable capacitor in the tuning frequency selection circuit. INDIN BC-R2011 can be used, but it is not limited to this model.

[0018] The monitoring switch 5 is used to switch between monitoring the idle audio, the incoming audio and turning off the speaker. A KCD1, 6-pin 3-position boat-type switch can be used, but is not limited to this model.

[0019] Audio amplifier 6, amplifies the audio signal and increases the loudness of the audio signal in the speaker to meet the requirements of on-site testing. Due to the working noise of the equipment in the machine room, when monitoring the incoming audio and the air receiving audio, their power needs to be further amplified to allow the speaker to reach sufficient loudness in this high-noise environment. It can be powered by 5V and digital amplifier Risym PAM8403, but is not limited to this model.

[0020] The speaker 7 is used to convert the electrical signal into a sound signal and amplify the sound. An 8Ω, 2W, 20*40mm speaker may be used, but is not limited to this model.

[0021] The main power supply 8 is used to provide power for the utility model. A Baidong BD18650-15-50 rechargeable 2600mAh 5V lithium battery pack can be used, but it is not limited to this model. The total power supply load test data is shown in Table 1. The working time meets the requirements of daily use and emergency repair.

[0022] Number of control items Whether to monitor Monitor Loudness Working hours Is it abnormal? First Test yes high 6h no Second test yes middle 8h no Third test no none 15h no

[0023] Table 1 Total power supply load test data table

[0024] The main switch 9 is used to control the power supply on and off of the utility model. A 2-pin 2-speed rocker switch KCD1 can be used, but it is not limited to this model.

[0025] The incoming audio signal 10 is the audio signal at the end of the audio transmission system and entering the front end of the transmitter system.

[0026] The received amplitude modulated signal 11 is a radio frequency signal radiated into space after being modulated by a medium wave transmitter.

[0027] The incoming audio signal 12 after the isolation buffer circuit is used for monitoring.

[0028] The audio signal 13 is received for monitoring.

[0029] The 3.3V voltage regulator circuit 14 is used to supply power to the demodulation detection circuit.

[0030] Compared with the prior art, the advantages of this utility model are:

[0031] The utility model and the existing monitoring system are used as two control groups to perform fault judgment at the same time. The fault phenomenon is abnormal demodulation signal of the air receiver and abnormal amplitude modulation of the transmitter. The two control groups are compared to determine the time spent on whether the incoming audio is faulty. Using the existing monitoring system, it takes 45 seconds to complete the fault judgment; using the utility model, it only takes 10 seconds to complete the fault judgment.

[0032] According to the SARFT Order No. 62, "Regulations on the Administration of Safe Broadcasting of Radio and Television", the annual first-level operating index of safe broadcasting of wireless transmitters is that the off-broadcast rate should be less than or equal to 30 seconds per 100 hours. The use of this utility model can save 35 seconds in fault judgment, greatly improving the operating index of safe broadcasting.

[0033] This function can also be achieved if a monitoring platform is built using digital equipment, but it is time-consuming, labor-intensive, and costly. In contrast, the use of the present utility model not only greatly reduces the cost of operation and maintenance, is both economical and safe, but also adds new functions without affecting the original monitoring system. Currently, there is no such dedicated on-site monitoring equipment, and the present utility model complies with the electronic circuit design specifications. With the present utility model, technicians can intuitively monitor the incoming signals and empty received signals in the transmitter room, which improves the convenience of monitoring during daily patrols, improves the efficiency of maintenance work, and shortens the judgment time for emergency repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Figure 1 A circuit diagram of the utility model;

[0036] Figure 2 A practical circuit diagram of the utility model;

[0037] Figure 3 An H-type buffer isolation circuit diagram of the utility model;

[0038] Figure 4 A schematic diagram of the structure of a main switch and a monitoring switch of the utility model;

[0039] Figure 5 The utility model is a structural schematic diagram of a real object.

[0040] Description of the figures in the attached drawings:

[0041] 1. Buffer isolation circuit, 2. DC isolation capacitor, 3. LED display module, 4. Demodulation detection circuit, 5. Monitoring switch, 6. Audio amplifier, 7. Speaker, 8. Main power supply, 9. Main switch, 10. Incoming audio signal, 11. Empty receiving amplitude modulation signal, 12. Incoming audio signal after isolation buffer circuit, 13. Empty receiving audio signal, 14. 3.3V voltage regulator circuit, 15. First resistor, 16. 680Ω resistor, 17. 10Ω resistor, 18. 3.3V voltage regulator diode, 19. Incoming audio signal XLR female end grounding port, 20. Incoming audio signal XLR female end hot end port, 21. Incoming audio signal XLR female end cold end port, 22. Incoming audio signal XLR male end grounding port, 23. Incoming audio signal XLR male end hot end port, 24. Incoming audio signal XLR male end 1. The cold end port of the end, 25. The TB3 interface of the transmitter external interface board, 26. The No. 1 port on the TB3 interface of the transmitter external interface board, 27. The No. 2 port on the TB3 interface of the transmitter external interface board, 28. The No. 3 port on the TB3 interface of the transmitter external interface board, 29. The A end of the monitoring switch channel 1, 30. The B end of the monitoring switch channel 1, 31. The A end of the monitoring switch channel 2, 32. The B end of the monitoring switch channel 2, 33. The A end of the monitoring switch channel 3, 34. The B end of the monitoring switch channel 3, 35. The audio output lout- of the audio power amplifier, 36. The audio output lout+ of the audio power amplifier, 37. The power input V+ of the audio power amplifier, 38. The power input V- of the audio power amplifier, 39. The audio input Input of the audio power amplifier L terminal, 40. Audio input Input G terminal of the audio amplifier, 41. Power input V+ terminal of the LED display module, 42. Audio input Rin terminal of the LED display module, 43. Audio input Lin terminal of the LED display module, 44. Power input V- and audio input ground terminal of the LED display module, 45. Power input V+ terminal of the demodulation detection circuit, 46. Signal output terminal Out+ terminal of the demodulation detection circuit, 47. Power input V- terminal of the demodulation detection circuit, 48. The second resistor, 49. The third resistor, 50. The fourth resistor, 51. XLR interface cable, 52. Rectangular acrylic box. DETAILED DESCRIPTION

[0042] The present invention is further described below with reference to the specific embodiments of the drawings, but is not intended to limit the present invention.

[0043] [Example 1]

[0044] like Figure 2 An actual circuit diagram of the utility model:

[0045] The medium wave transmitter on-site monitoring display device is provided with a transmitter external interface board TB3 interface component (25), and the transmitter external interface board TB3 interface component (25) includes three ports: port 1 (26), port 2 (27), and port 3 (28); (see attached Figure 2 ).

[0046] The incoming audio signal 10 of the transmitter comes from the above three ports. The XLR interface cable 51 includes three identical signal cables. The first signal cable is connected to port 1 26, and connected to the incoming audio signal XLR male end ground port 22; the second signal cable is connected to port 27, and connected to the incoming audio signal XLR male end hot end port 23; the third signal cable is connected to port 3 28, and connected to the incoming audio signal XLR male end cold end port 24.

[0047] The input audio signal XLR male end grounding port 22 is connected to the input audio signal XLR female end grounding port 19.

[0048] The incoming audio signal XLR male end hot end port 23 is connected to the incoming audio signal XLR female end hot end port 20.

[0049] The incoming audio signal XLR male cold end port 24 is connected to the incoming audio signal XLR female cold end port 21.

[0050] The audio signal enters the hot end port 20 of the XLR female end and is connected to the first resistor 15 ; the audio signal enters the cold end port 21 of the XLR female end and is connected to the third resistor 49 , and enters the buffer isolation circuit 1 together.

[0051] The buffer isolation circuit 1 has two output terminals. The output terminal of the fourth resistor 50 is suspended, and the output terminal of the second resistor 48 is connected in parallel to one end of the DC isolation capacitor 2 and the A terminal 29 of the monitoring switch channel 1. The first resistor 15, the second resistor 48, the third resistor 49, and the fourth resistor 50 are all 110Ω resistors, which are used to form the buffer isolation circuit 1. The other end of the DC isolation capacitor 2 is connected to the audio input Rin terminal 42 of the LED display module.

[0052] The input audio signal XLR female ground port 19 is connected to the B terminal 30 of the monitoring switch channel 1 and is used to transmit the ground terminal of the input audio signal.

[0053] The signal output terminal Out+ 46 of the demodulation detection circuit is connected in parallel to the A terminal 31 of the monitoring switching channel 2 and the audio input Lin terminal 43 of the LED display module. The A terminal 31 of the monitoring switching channel 2 is used to transmit the positive terminal of the idle audio signal.

[0054] The A terminal 33 of the monitoring switching switch channel 3 is used to transmit the positive terminal of the selected audio signal and is connected to the audio input Input G terminal 40 of the audio power amplifier.

[0055] The B terminal 34 of the monitoring switch channel 3 is used for transmitting the ground terminal of the selected audio signal and is connected to the audio input Input L terminal 39 of the audio power amplifier.

[0056] The audio output lout- terminal 35 of the audio power amplifier is connected to the negative terminal of the speaker 7, and the audio output lout+ terminal 36 of the audio power amplifier is connected to the positive terminal of the speaker 7.

[0057] The positive end of the main power supply 8 is connected to one end of the main switch 9. The other end of the main switch 9 is connected in parallel with the 10Ω resistor 17, the power input V+ terminal 37 of the audio power amplifier, and the power input V+ terminal 41 of the LED display module. The other end of the 10Ω resistor 17 is connected in parallel with the negative end of the 3.3V voltage zener diode 18 and the power input V+ terminal 45 of the demodulation detection circuit. The positive end of the 3.3V voltage zener diode 18 is connected in parallel with the power input V- terminal 47 of the demodulation detection circuit, the negative end of the main switch 9, the power input V- of the LED display module and the audio input ground terminal 44, and the power input V- terminal 38 of the audio power amplifier.

[0058] The 680Ω resistor 16 is used to form a buffer isolation circuit.

[0059] The 10Ω resistor 17 is used as a voltage dividing element of the 3.3V voltage stabilizing circuit 14.

[0060] The 3.3V voltage regulator diode 18 is used as a voltage regulator element of the 3.3V voltage regulator circuit 14 .

[0061] [Example 2]

[0062] Figure 3 An H-type buffer isolation circuit diagram of the utility model:

[0063] The first resistor 15 is connected in parallel with one end of the 680Ω resistor 16 and the second resistor 48. The third resistor 49 is connected in parallel with the other end of the 680Ω resistor 16 and the fourth resistor 50. A single-channel audio signal is used as the input signal monitoring of the utility model.

[0064] [Example 3]

[0065] Figure 4 A schematic diagram of the structure of a main switch and a monitoring switch of the utility model:

[0066] The utility model is provided with two switches. A main switch 9 is connected to the positive electrode of the lithium battery. The utility model can be closed when not in use, and can be temporarily opened and reasonably used when repairing and troubleshooting; a monitoring switching switch 5 is connected to the front end of the audio amplifier 6.

[0067] [Example 4]

[0068] Figure 5This is a schematic diagram of the structure of a physical object of the utility model:

[0069] The different circuit modules constituting the utility model are neatly arranged and installed in a rectangular acrylic box 52. The rectangular acrylic box 52 has a size of 130mm*100mm*40mm. The utility model is hung on the transmitter by means of a XLR interface connection line 51 and a strong magnet applied on the back of the utility model. The XLR interface connection line 51, as a signal transmission line, also introduces the incoming audio signal 10 to the utility model. This hanging method can facilitate technicians to easily access the equipment without affecting the external structure of the transmitter. The two LED column displays of the actual object of the utility model: the left side is the incoming audio signal 10, and the right side is the empty receiving audio signal 13.

[0070] The XLR interface cable 51 may be made of 4N oxygen-free copper 1.5 m, but is not limited to this model.

Claims

1. A medium wave transmitter on-site monitoring display device, characterized in that: The medium wave transmitter on-site monitoring display device is composed of a buffer isolation circuit (1), a DC isolation capacitor (2), an LED display module (3), a demodulation detection circuit (4), a monitoring switch (5), an audio power amplifier (6), a speaker (7), a main power supply (8), a main switch (9), and a 3.3V voltage stabilizing circuit (14); The medium wave transmitter on-site monitoring display device: The input audio signal (10) is connected to the input end of the buffer isolation circuit (1) through a signal transmission line; the output end of the buffer isolation circuit (1) is divided into two paths, one of which is connected to the DC isolation capacitor (2) and connected to the signal input end of the LED display module (3) after passing through the DC isolation capacitor (2), and the other of which is connected to the input end of the audio monitoring switch (5); the output end of the demodulation detection circuit (4) is divided into two paths, one of which is connected to the input end of the LED display module (3) and the other of which is connected to the input end of the monitoring switch (5); the output end of the monitoring switch (5) is connected to the input end of the audio power amplifier (6) for audio amplification, and the output end of the audio power amplifier is connected to the input end of the speaker (7); In the power supply part, the positive end of the main power supply (8) is connected to the input end of the main switch (9), and the output end of the main switch (9) is divided into two paths; one path is connected to the 3.3V voltage regulator circuit (14) to stabilize the voltage at 3.3VDC, the output end of the voltage regulator circuit (14) is connected to the positive power input end of the demodulation detection circuit (4), and the other path is connected to the positive power input end of the LED display module (3) and the audio amplifier (6); the negative end of the main power supply (8) is connected to the negative power input end of each power module to form a power supply loop.

2. A medium wave transmitter on-site monitoring display device, characterized in that: The medium wave transmitter on-site monitoring display device is provided with a transmitter external interface board TB3 interface component (25), and the transmitter external interface board TB3 interface component (25) includes three ports: port No. 1 (26), port No. 2 (27), and port No. 3 (28); The incoming audio signal (10) of the transmitter comes from the above three ports; the XLR interface connection line (51) includes three identical signal lines; the first signal line is connected to port No. 1 (26) and connected to the incoming audio signal XLR male end ground port (22); the second signal line is connected to port No. 2 (27) and connected to the incoming audio signal XLR male end hot end port (23); the third signal line is connected to port No. 3 (28) and connected to the incoming audio signal XLR male end cold end port (24); The input audio signal XLR male ground port (22) is connected to the input audio signal XLR female ground port (19); The incoming audio signal XLR male end hot end port (23) is connected to the incoming audio signal XLR female end hot end port (20); The incoming audio signal XLR male cold end port (24) is connected to the incoming audio signal XLR female cold end port (21); The audio signal enters the machine through the hot end port (20) of the XLR female end, connected to the first resistor (15); the audio signal enters the machine through the cold end port (21) of the XLR female end, connected to the third resistor (49), and enters the buffer isolation circuit (1) together; The buffer isolation circuit (1) has two output terminals; the output terminal of the fourth resistor (50) is suspended, and the output terminal of the second resistor (48) is connected in parallel to one end of the DC isolation capacitor (2) and the A terminal (29) of the monitoring switch channel 1; the other end of the DC isolation capacitor (2) is connected to the audio input Rin terminal (42) of the LED display module; The ground port (19) of the female end of the XLR connector of the incoming audio signal is connected to the B end (30) of the monitor switch channel 1; The signal output terminal Out+ (46) of the demodulation detection circuit is connected in parallel to the A terminal (31) of the monitoring switching switch channel 2 and the audio input Lin terminal (43) of the LED display module; the A terminal (31) of the monitoring switching switch channel 2; Connect the A terminal (33) of the monitor switch channel 3 to the audio input G terminal (40) of the audio amplifier. Connect the B terminal (34) of the monitor switch channel 3 to the audio input L terminal (39) of the audio amplifier; The audio output lout- terminal (35) of the audio power amplifier is connected to the negative terminal of the speaker (7), and the audio output lout+ terminal (36) of the audio power amplifier is connected to the positive terminal of the speaker (7); the positive terminal of the main power supply (8) is connected to one end of the main switch (9); the other end of the main switch 9 is connected in parallel with a 10Ω resistor (17), a power input V+ terminal (37) of the audio power amplifier, and a power input V+ terminal (41) of the LED display module; the other end of the 10Ω resistor (17) is connected in parallel with a negative end of a 3.3V voltage stabilizing diode (18) and a power input V+ terminal (45) of a demodulation detection circuit; the positive end of the 3.3V voltage stabilizing diode (18) is connected in parallel with a power input V- terminal (47) of the demodulation detection circuit, a negative end of the main switch (9), a power input V- of the LED display module and an audio input ground terminal (44), and a power input V- terminal (38) of the audio power amplifier.

3. The medium wave transmitter on-site monitoring display device according to claim 2, characterized in that: The first resistor (15) of the buffer isolation circuit (1) is connected in parallel to one end of the 680Ω resistor (16) and the second resistor (48), and the third resistor (49) is connected in parallel to the other end of the 680Ω resistor (16) and the fourth resistor (50).

4. The medium wave transmitter on-site monitoring display device according to claim 2, characterized in that: The main switch (9) is connected to the positive electrode of the lithium battery; the monitoring switch (5) is connected to the front end of the audio power amplifier (6).

5. A medium wave transmitter on-site monitoring display device according to claim 1 or claim 2, characterized in that: The medium wave transmitter on-site monitoring display device arranges the different circuit modules constituting the device neatly into a rectangular acrylic box (52); the rectangular acrylic box (52) has a size of 130mm*100mm*40mm; the device is hung on the transmitter through a XLR interface connection line (51) and a strong magnet applied to the back of the device; the XLR interface connection line (51) serves as a signal transmission line and also introduces the input audio signal (10) into the device.

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