DRM front-end receiving device

Abstract

The utility model provides a DRM front end receiving device, which relates to the technical field of DRM front end receiving devices and comprises a device body, a mounting plate is mounted below the device body, a limiting groove is formed in the mounting plate, a first moving block is slidably connected in the limiting groove, a first spring is mounted outside the first moving block, and a second spring is mounted outside the first spring. A fixing rod is fixedly mounted on the upper surface of the first moving block, through cooperation of a protection plate, a first spring and a fixing rope, the protection plate is in a vertical state when protecting the front end of the device body, at the moment, the first spring can pull the first moving block and the fixing rod to move, and the protection plate can be pulled through the fixing rope to seal the front end of the device body; the device can protect the interface, the display component and other positions, can prevent external articles from damaging the display component and other positions when the device body is carried, achieves the function of protecting the outside of the device body, and facilitates the improvement of the overall carrying safety and stability.

Description

Technical Field

[0001] This utility model relates to a receiving device, specifically a DRM front-end receiving device, belonging to the technical field of DRM front-end receiving devices. Background Technology

[0002] A DRM front-end receiver is a device used to receive and process digital broadcast signals. It has an internal receiver for receiving broadcast signals. After receiving the signal and processing it by the internal processing unit, the signal can be converted into audio or video data. It can assist in receiving relevant channel information and has spectrum compatibility with the spectrum occupied by analog AM broadcasts. The AM spectrum allocation does not need to be re-allocated. Traditional high-efficiency, high-power transmitters can be reused through simple technical modifications without the need to purchase new transmitter equipment.

[0003] Existing DRM front-end receiver designs include components such as a display and a speaker. However, these structures are directly exposed to the environment and lack any protective measures for the display and interfaces. This means that the external components of the DRM front-end receiver cannot be protected when the device is moved or carried, affecting its overall portability. Therefore, we provide a DRM front-end receiver design that solves these problems. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a DRM front-end receiving device, the specific technical solution of which is as follows:

[0005] A DRM front-end receiving device includes a device body, an mounting plate mounted on the lower part of the device body, a limiting groove formed inside the mounting plate, a movable block slidably connected inside the limiting groove, a spring mounted outside the movable block slidably, a fixing rod fixedly mounted on the upper surface of the movable block slidably, a movable block 2 slidably connected inside the fixing rod, a fixing rope fixedly mounted on the outer surface of the movable block 2, a connecting plate fixedly mounted on the other end of the fixing rope, and a protective plate fixedly mounted on the outer surface of the connecting plate.

[0006] Preferably, the device body includes a system antenna unit, a signal digital tuning unit, and an interface processing unit. The system antenna unit is capable of spatial reception of DRM broadcast signals.

[0007] Preferably, the signal digital tuning unit can perform the adjustment of traditional AM signals and the generation of audio processing, and the interface processing unit can complete the connection between the interface and the bus.

[0008] Preferably, a limiting rod is fixedly installed on the inner wall of the limiting groove, the outer surface of the limiting rod is slidably connected to the inside of the moving block, a spring is sleeved on the outside of the limiting rod, and the other end of the spring is fixedly installed on the inner wall of the limiting groove.

[0009] Preferably, the outer surface of the mounting plate is in contact with the interior of the protective plate, a second spring is fixedly installed inside the fixing rod, and the other end of the second spring is fixedly installed to the outer surface of the moving block. Multiple sets of the fixing rod and the fixing rope are symmetrically arranged.

[0010] Preferably, the protective plate is in contact with one side of the device body, and a plug is fixedly installed on the outer surface of the protective plate.

[0011] Preferably, the mounting plate has multiple sets of positioning holes inside, and when the guard plate is in a horizontal state, the insertion rod contacts the inside of the positioning holes.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This DRM front-end receiving device, through the cooperation of a protective plate, a spring, and a fixing rope, ensures that the protective plate is in a vertical position when protecting the front of the device body. At this time, the spring can pull the moving block and the fixing rod to move, and the fixing rope can pull the protective plate to seal the front position of the device body, protecting the interface and display components. This prevents damage to the display components and other parts from external objects when carrying the device body. Under the pull of the spring, the fixing rope tightens the protective plate, controlling the stable connection of the protective plate to the protected position, ensuring the stability of the overall connection, and realizing the function of protecting the external parts of the device body, which helps to improve the safety and stability of the overall carrying.

[0014] 2. This DRM front-end receiving device uses components such as spring two and a plug rod. When the device body is in use, the control plate moves horizontally to the bottom position of the device body. At this time, the plug rod is connected to the positioning hole. Under the action of spring two, the fixing rope pulls the guard plate into close contact with the lower surface of the mounting plate. At this time, the guard plate can provide a larger area of ​​support for the bottom of the device body, which can improve the stability of the bottom support of the device body and make the whole body less likely to tip over. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the mounting plate component of this utility model;

[0017] Figure 3 This utility model Figure 2 A magnified view of a portion of the image;

[0018] Figure 4 This is a schematic diagram of the fixing rod component of this utility model;

[0019] Figure 5 This is a functional block diagram of the DRM receiver system of this utility model;

[0020] Figure 6 This is a block diagram of the DRM system of this utility model.

[0021] Figure descriptions: 1. Device body; 101. System antenna unit; 102. Signal digital tuning unit; 103. Interface processing unit; 2. Mounting plate; 3. Limiting groove; 4. Moving block one; 5. Spring one; 6. Fixing rod; 7. Moving block two; 8. Fixing rope; 9. Connecting plate; 10. Protective plate; 11. Limiting rod; 12. Spring two; 13. Insert rod; 14. Positioning hole. Detailed Implementation

[0022] The present invention will now be further described with reference to the accompanying drawings.

[0023] Please see Figure 1 - Figure 6 A DRM front-end receiving device includes a device body 1. The device body 1 internally includes a system antenna unit 101, a signal digital tuning unit 102, and an interface processing unit 103. The system antenna unit 101 is capable of spatial reception of DRM broadcast signals. The system antenna unit 101 includes a shortwave telescopic antenna and a medium-wave loop antenna. The system uses two independent antennas to support medium-wave reception and shortwave reception respectively. The system uses mechanical switches to manually control the reception of medium-wave and shortwave signals. The system completes spatial reception of DRM broadcast signals through the antenna unit and sends the received weak signals to the signal digital tuning unit 102.

[0024] The digital tuning unit 102 can perform the modulation and audio processing of traditional AM signals. The digital tuning unit 102 uses a monolithically integrated TEF6659 chip and mainly includes an analog signal receiving front-end, a digital tuning frequency synthesizer, and internal filtering and amplification circuits. After receiving, amplifying, and filtering medium wave and short wave signals, the digitally controlled tuning frequency synthesizer tunes the signal to a low intermediate frequency for ADC sampling. The entire control is completed via a unified I2C bus. This unit can demodulate traditional AM signals and generate audio, outputting independent digital and analog audio signals to subsequent units. It also has an independent I2S input interface for the internal audio processing unit to complete audio processing. Simultaneously, it can also output the sampled zero-IF I / Q data to subsequent units via an independent I2S bus.

[0025] The interface processing unit 103 is responsible for connecting the interface to the bus. It mainly consists of an FPGA and a USB 3.0 interface chip. The USB 3.0 chip primarily controls the I2C interface of the TEF6659 and establishes a high-speed GPIF interface with the FPGA, communicating with the host computer software via the USB bus. The FPGA mainly receives and converts the TEF6659's I2S bus signal, enabling bidirectional communication with the USB 3.0 chip, and is also connected to the TEF6659's I2S interface.

[0026] The device body 1 also includes host computer processing software. The interface processing unit 103 is connected to the host computer processing software via USB 3.0. During operation, to meet the requirement of simultaneous analog and digital signal reception, the RF front-end of the DRM receiver was designed by modifying an existing analog radio. The integrated receiver can both receive analog signals and process digital signals, thus adapting to the needs of simultaneous analog and digital broadcasting. The following section mainly discusses the signal processing process of the digital receiver.

[0027] The test receiver system block diagram is as follows: Figure 6 As shown, the received signal is down-converted to intermediate frequency (IF) by the analog radio front end. The IF signal is then extracted, filtered, and sent to the AD sampler to obtain the IF sampling data.

[0028] Intermediate frequency (IF) sampled data is demodulated to obtain baseband data. First, the starting position of the OFDM symbol is found through symbol synchronization. Then, the OFDM signal is demodulated using FFT, transforming the time-domain data to the frequency domain. Frequency pilot information is then used to calculate and correct the frequency deviation, as OFDM systems are highly sensitive to carrier frequency offset. After frequency correction, the frequency error should be less than 0.01 times the subcarrier spacing. Based on this, the start symbol of the DRM system's transmission frame is found using time pilot information, and the receiver then begins subsequent processing from the start position of the transmission frame.

[0029] Due to the complex variations in shortwave channels and the strong selective fading in both the time and frequency domains, the amplitude and phase of the received signal are severely interfered with, which introduces a large error when decoding high-order QAM mapping. The equalization module in the block diagram is used to solve the above problems. The DRM system is designed with gain pilots distributed in the time-frequency domain, and the information of the gain pilots is used for channel equalization.

[0030] according to Figure 6The process shown involves extracting the FAC unit from the equalized data and decoding it to obtain the demodulated SDC information; then extracting the SDC unit and decoding it based on the FAC information to obtain the SDC data entity; finally, extracting the MSC and decoding it based on the FACSDC information. These units undergo deinterleaving, OAM mapping de-mapping, Viterbi decoding, and energy descrambling modules, respectively. Finally, the data demultiplexed by the MSC is subjected to audio decoding or data decoding.

[0031] The synergy of the above structures enables this device to achieve excellent receiving performance, stability, and compatibility. By optimizing the design of the RF front-end and signal processing section, the receiving sensitivity and anti-interference capability of DMR signals are significantly improved. The use of high-performance hardware components and stable algorithm design ensures the stability of the receiving device during long-term operation. The device can simultaneously receive analog and digital signals, meeting the needs of different users and enhancing the product's market competitiveness.

[0032] A mounting plate 2 is installed below the device body 1. The mounting plate 2 is connected to the lower part of the device body 1 by multiple sets of fixing bolts. A limiting groove 3 is opened inside the mounting plate 2. A moving block 4 is slidably connected inside the limiting groove 3. A spring 5 is installed on the outside of the moving block 4. A limiting rod 11 is fixedly installed on the inner wall of the limiting groove 3. The outer surface of the limiting rod 11 is slidably connected to the inside of the moving block 4. The limiting rod 11 can limit and assist the position of the moving block 4. The spring 5 is sleeved on the outside of the limiting rod 11. The other end of the spring 5 is fixedly installed on the inner wall of the limiting groove 3. Under the pull of the spring 5, the moving block 4 has the tendency to move in the direction of extension and retraction of the spring 5. At this time, the moving block 4 will slide inside the limiting groove 3.

[0033] A fixed rod 6 is fixedly installed on the upper surface of the movable block 4. Under the control of the movable block 4, the fixed rod 6 will retract with the spring 5, and the position of the fixed rod 6 can be controlled. The movable block 7 is slidably connected inside the fixed rod 6. The outer surface of the mounting plate 2 is in contact with the inside of the guard plate 10. A spring 12 is fixedly installed inside the fixed rod 6. The other end of the spring 12 is fixedly installed on the outer surface of the movable block 7. Under the pull of the spring 12, the movable block 7 will slide inside the fixed rod 6. A fixed rope 8 is fixedly installed on the outer surface of the movable block 7. Multiple sets of fixed rods 6 and fixed ropes 8 are symmetrically arranged. One end of the fixed rope 8 is connected to the outside of the movable block 7. The movement of the movable block 7 can control the movement of one end of the fixed rope 8.

[0034] A connecting plate 9 is fixedly installed at the other end of the fixing rope 8. A protective plate 10 is fixedly installed on the outer surface of the connecting plate 9. The protective plate 10 is in contact with one side of the device body 1. When protecting the outside of the device body 1, the protective plate 10 is in a vertical state. At this time, the inside of the protective plate 10 is connected to one side of the device body 1. Under the pull of the spring 5, the protective plate 10 will be tightened. At this time, the protective plate 10 can be tightly connected to the device body 1. The front end of the device body 1 can be protected by the protective plate 10. The display component, control component and speaker assembly can be protected, improving the overall stability when carried.

[0035] A rod 13 is fixedly installed on the outer surface of the protective plate 10. Multiple positioning holes 14 are opened inside the mounting plate 2. When the protective plate 10 is in a horizontal state, the rod 13 contacts the inside of the positioning hole 14. When the device body 1 is in use, the protective plate 10 is controlled to be horizontal and pulled to the bottom position of the device body 1. At this time, the rod 13 enters the inside of the positioning hole 14. Under the pull of the spring 12, the protective plate 10 is in close contact with the mounting plate 2. The protective plate 10 can increase the support area of ​​the bottom of the device body 1. At this time, the bottom of the device body 1 has a larger support area, and the whole device is not easy to tip over when placed and used, making it safer and more stable during use.

[0036] The electrical equipment in this application is a common type of electrical equipment in the prior art. This application will not elaborate on its model or internal structure. It can also be replaced by other power sources.

[0037] In use, the device body 1, through its internal system antenna unit 101, signal digital tuning unit 102, interface processing unit 103, and host computer processing software, can receive and analyze the main service channel, service description signal, and fast access signal, and perform basic functions such as channel selection and signal strength testing. When carried as a whole, the protective plate 10 is located at the front end of the device body 1 and is in a vertical position. At this time, spring 5 pulls the moving block 4 to move. Under the pull of spring 5 and fixing rope 8, the protective plate 10 can seal the front end of the device body 1, thus protecting the exterior of the device body 1. When the device body 1 is in use, the protective plate 10 is controlled to a horizontal position. At this time, the protective plate 10 is moved to the bottom of the mounting plate 2, allowing the insertion rod 13 to enter the positioning hole 14. Under the pull of spring 12, the protective plate 10 is tightly connected to the mounting plate 2. The protective plate 10 can provide stable support for the bottom of the device body 1, ensuring the stability of the whole during use.

[0038] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A DRM front-end receiving apparatus comprising an apparatus body (1), characterized in that: The lower part of the device body (1) is provided with a mounting plate (2), the inside of the mounting plate (2) is provided with a limiting groove (3), the inside of the limiting groove (3) is slidably connected with a moving block one (4), the outside of the moving block one (4) is provided with a spring one (5), the upper surface of the moving block one (4) is fixedly provided with a fixed rod (6), the inside of the fixed rod (6) is slidably connected with a moving block two (7), the outer surface of the moving block two (7) is fixedly provided with a fixed rope (8), the other end of the fixed rope (8) is fixedly provided with a connecting plate (9), the outer surface of the connecting plate (9) is fixedly provided with a guard plate (10).

2. The DRM front-end receiving apparatus of claim 1, wherein: The inside of the device body (1) comprises a system antenna unit (101), a signal digital tuning unit (102) and an interface processing unit (103), the system antenna unit (101) can complete the spatial reception of DRM broadcast signals.

3. A DRM front-end receiving apparatus according to claim 2, characterized in that: The signal digital tuning unit (102) can complete the adjustment and audio processing generation of traditional AM signals, and the interface processing unit (103) can complete the connection of interfaces and buses.

4. The DRM front-end receiving apparatus of claim 1, wherein: The inner wall of the limiting groove (3) is fixedly provided with a limiting rod (11), the outer surface of the limiting rod (11) is slidably connected with the inside of the moving block one (4), the spring one (5) is sleeved on the outside of the limiting rod (11), and the other end of the spring one (5) is fixedly provided with the inner wall of the limiting groove (3).

5. The DRM front-end receiving apparatus of claim 1, wherein: The outer surface of the mounting plate (2) is in contact with the inside of the guard plate (10), the inside of the fixed rod (6) is fixedly provided with a spring two (12), the other end of the spring two (12) is fixedly provided with the outer surface of the moving block two (7), and the fixed rod (6) and the fixed rope (8) are symmetrically provided with multiple groups.

6. The DRM front-end receiving apparatus of claim 1, wherein: The guard plate (10) is in contact with one side of the device body (1), and the outer surface of the guard plate (10) is fixedly provided with a plug rod (13).

7. A DRM front-end receiving apparatus according to claim 6, characterized in that: The inside of the mounting plate (2) is provided with multiple positioning holes (14), and the plug rod (13) is in contact with the inside of the positioning hole (14) when the guard plate (10) is in a horizontal state.

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