A domestic telex transmission module
By using a master-slave MCU collaborative design and serial communication for a domestically produced telegraph transmission module, the problem of anti-interference and efficient transmission of narrowband shortwave radios in complex electromagnetic environments was solved. This enabled efficient datagram transmission in low signal-to-noise ratio channels, reducing costs and improving system performance and communication quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU GUOGUANG DATA COMM
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-14
AI Technical Summary
Existing narrowband shortwave radio modems struggle to achieve interference resistance and high-efficiency shortwave communication in complex electromagnetic environments, especially in low signal-to-noise ratio channel environments where datagram transmission functionality is insufficient.
The system adopts a domestically produced telegraph transmission module, which utilizes the collaborative work of the master MCU microcontroller and the slave MCU microcontroller. Combined with the GD32F470 chip and ES8311 audio codec, it achieves independent modulation and demodulation of the 801 waveform algorithm. Data interaction is optimized through serial communication to ensure accurate signal transmission.
It achieves efficient datagram transmission in low signal-to-noise ratio channel environments, reduces hardware costs, improves system performance and reliability, and ensures communication quality and security.
Smart Images
Figure CN224503357U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shortwave communication technology, and more specifically, to a domestically produced telegraph transmission module. Background Technology
[0002] Shortwave communication plays a vital role in data communication, oil exploration, and ocean shipping due to its unique long-distance characteristics. Shortwave data communication requires a modem. Currently, widely used narrowband shortwave radio modems employ both serial and parallel systems. The serial system uses single-carrier modulation to transmit information, requiring high channel equalization. The parallel system distributes the transmitted data across multiple subcarriers in parallel. In traditional parallel systems, the subcarriers do not overlap in the spectrum. At the receiving end, a filter bank is used to separate the sub-channels, requiring guard bands between them. This results in low bandwidth utilization, and implementing multiple filters is also challenging.
[0003] In increasingly complex electromagnetic environments, the two modulation schemes mentioned above are insufficient to meet the requirements of shortwave communication for anti-interference and high-efficiency transmission.
[0004] Based on the above situation, there is a need for a domestically produced telegraph transmission module to realize the datagram service transmission function in a low signal-to-noise ratio channel environment. Utility Model Content
[0005] The purpose of this invention is to provide a domestically produced telegraph transmission module to overcome the aforementioned defects in the prior art.
[0006] The technical solution to achieve the purpose of this utility model is: a domestically produced telegraph transmission module, including a main MCU microcontroller, a slave MCU microcontroller, a first audio codec, a second audio codec, and an external interface; the main MCU microcontroller is communicatively connected to the slave MCU microcontroller and the external interface through a serial port interface, the first audio codec is communicatively connected to the main MCU microcontroller and the external interface, and the second audio codec is communicatively connected to the slave MCU microcontroller and the external interface; the main MCU microcontroller is a transmitting chip, responsible for 801 waveform output, PTT control, and external serial port data transmission, and the slave MCU microcontroller is a receiving chip, responsible for demodulating the channel 801 waveform. Through the coordinated work of the master and slave chips, the entire module realizes the functions of receiving and transmitting telegraph signals.
[0007] Preferably or optionally, the master MCU microcontroller uses a core processing chip of model GD32F470, and the slave MCU microcontroller uses a core processing chip of model GD32F470.
[0008] Preferably or optionally, the first audio codec uses an ES8311 audio codec chip. The first audio codec is connected to the main MCU microcontroller via an I2S interface, converts the digital waveform output by the main MCU microcontroller into an analog audio signal, and sends it through the external interface.
[0009] Preferably or optionally, the second audio codec uses an ES8311 audio codec chip. The second audio codec is connected to the slave MCU microcontroller via an I2S interface, converting the analog audio signal received from the external interface into a digital signal and transmitting it to the slave MCU microcontroller.
[0010] Preferably or optionally, the external interface uses a plug-in connector for communication, and a connector of model JL5-10TJB-1 is selected.
[0011] Preferably or optionally, the connector patch of the external interface is mounted on the reverse side of the PCB board and located in the center of the lower side of the PCB board.
[0012] Preferably or optionally, the external interface pins include AUDIO_IN for module audio input, AUDIO_OUT for module audio output, PTT_OUT for module keying PTT signal output, UART_TX_3V3 for module serial port output, and UART_RX_3V3 for module serial port input.
[0013] By adopting the above technical solution, this utility model has the following beneficial effects:
[0014] (1) This utility model is based on a domestically produced hardware platform and adopts the 801 waveform algorithm with strong anti-interference capability to realize the datagram service transmission function in a low signal-to-noise ratio channel environment. In order to meet the accuracy requirements of the 801 waveform algorithm, the channel audio receiving and transmitting algorithms are designed to be independently calculated in two MCU chips. This avoids the problem of insufficient computing power that may occur when all computing tasks are concentrated on one chip. In actual operation, the transmitting chip and the receiving chip independently perform the modulation and demodulation calculations of the 801 waveform without interfering with each other.
[0015] (2) This utility model uses serial communication between the master MCU microcontroller and the slave MCU microcontroller for data interaction. Serial communication is a simple and efficient communication method, suitable for short-distance data transmission between chips. In this module, serial communication mainly completes the transmission of received data and the configuration of the module's receiving status. Through serial communication, the transmitting chip can obtain the status information of the receiving chip in real time, process and forward the received data. At the same time, the receiving chip can also adjust its own receiving status according to the instructions of the transmitting chip to ensure the coordinated operation of the modules. This master-slave serial communication architecture not only simplifies the internal design of the module, but also improves the overall performance and reliability of the system.
[0016] (3) The GD32F470 of this utility model is a high-performance microcontroller launched by GigaDevice Semiconductor Co., Ltd. It adopts an advanced Cortex-M4 core with a main frequency of up to 240MHz and has powerful processing capabilities. The chip has a built-in advanced DSP hardware accelerator and a single-precision floating-point unit (FPU), which can efficiently complete complex digital signal processing tasks. In the telegraph transmission module, these features of the GD32F470 are fully utilized and applied to the calculation of the 801 waveform algorithm. The 801 waveform is a specific modulation and demodulation waveform, which is widely used in telegraph communication. Its algorithm has high requirements for calculation accuracy and speed. Choosing the GD32F470 as the core processing chip can not only meet the calculation requirements of the 801 waveform algorithm, but also effectively avoid the problem of the current high price of domestic DSP chips, thereby significantly reducing hardware costs while ensuring performance.
[0017] (4) This utility model relates to the ES8311 chip developed by Suzhou Shunxin Semiconductor Co., Ltd. This is a high-performance, low-power multi-bit Σ-Δ (delta-sigma) audio codec chip with excellent performance and low power consumption. In terms of digital signal processing, the ES8311 supports a 24-bit data width and a maximum sampling frequency of 96kHz. Such high-precision data processing capabilities can meet the modulation output and demodulation input requirements of 801 waveforms, ensuring that the audio signal is not distorted during transmission, thereby guaranteeing the quality of telegraph communication. The use of domestically produced, independently controllable chips is of great significance for ensuring the security and stability of the communication system. At the same time, the lower price also helps to control the module's cost and improve the product's market competitiveness.
[0018] (5) This utility model uses an ES8311 chip in conjunction with a transmitting chip and a receiving chip, respectively, for receiving and transmitting audio in the telex service channel. Through this design, the encoding and decoding of audio signals are closely integrated with the processing of digital signals, realizing efficient telex communication. Attached Figure Description
[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...
[0020] Figure 1 This is a schematic diagram of the hardware structure of this utility model.
[0021] Figure 2 This is a schematic diagram of the interface and module of this utility model.
[0022] Figure 3 This is the software architecture of this utility model.
[0023] 1. Master MCU microcontroller; 2. Slave MCU microcontroller; 3. First audio codec; 4. Second audio codec; 5. External interface. Detailed Implementation
[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0028] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this utility model and should not be used to limit the scope of protection of this utility model.
[0030] (Example 1)
[0031] In increasingly complex electromagnetic environments, the modems used in widely used narrowband shortwave radios currently employ both serial and parallel systems, which are insufficient to meet the requirements of shortwave communication for interference resistance and high-efficiency transmission. Therefore, it is necessary to adopt the 801 waveform algorithm with strong anti-interference capabilities to achieve datagram service transmission in low signal-to-noise ratio channel environments.
[0032] See Figure 1 A domestically produced telegraph transmission module includes a main MCU microcontroller 1, a slave MCU microcontroller 2, a first audio codec 3, a second audio codec 4, and an external interface 5. The main MCU microcontroller 1 is connected to the slave MCU microcontroller 2 and the external interface 5 via serial ports. The first audio codec 3 is connected to the main MCU microcontroller 1 and the external interface 5. The second audio codec 4 is connected to the slave MCU microcontroller 2 and the external interface 5.
[0033] The master MCU microcontroller 1 uses a GD32F470 core processing chip as the transmitting chip, which is responsible for the output of the 801 waveform, PTT control, and external serial port data transmission. The slave MCU microcontroller 2 uses a GD32F470 core processing chip as the receiving chip, which is responsible for the demodulation of the channel 801 waveform. Through the coordinated work of the master and slave chips, the entire module realizes the function of receiving and transmitting telegraph signals.
[0034] The first audio codec 3 uses an ES8311 audio codec chip. It connects to the main MCU microcontroller 1 via an I2S interface, converting the digital waveform output by the main MCU microcontroller 1 into an analog audio signal, which is then transmitted through the external interface 5. The second audio codec 4 also uses an ES8311 audio codec chip. It connects to the slave MCU microcontroller 2 via an I2S interface, converting the analog audio signal received from the external interface 5 into a digital signal and transmitting it to the slave MCU microcontroller 2.
[0035] Based on a domestically developed hardware platform, this system employs the 801 waveform algorithm, which boasts strong anti-interference capabilities, to achieve datagram transmission in low signal-to-noise ratio (SNR) channel environments. To meet the accuracy requirements of the 801 waveform algorithm, the channel audio reception and transmission algorithms are designed to be independently calculated on two separate MCU chips. This avoids the potential computational power shortage that might occur if all computational tasks were concentrated on a single chip. In actual operation, the transmitting and receiving chips independently perform 801 waveform modulation and demodulation calculations without interference.
[0036] The high performance and low price of the GD32F470 chip, along with the self-controllability and low cost advantages of the ES8311 chip, provided strong support for cost control of the module. Furthermore, significant work was done on the module's circuit design and software algorithm optimization, further improving its performance and stability. Optimization of the audio codec algorithm improved audio signal processing efficiency and reduced power consumption; reasonable circuit layout reduced signal interference and improved communication quality.
[0037] See Figure 2The telex service transmission module uses connector communication with studs at the four corners for fixation, and its dimensions are 60mm × 60mm. External interface 5 uses a mating connector for communication, specifically a JL5-10TJB-1 connector. The connector patch for external interface 5 is mounted on the reverse side of the PCB board, with its fixing position centered between the two screw holes on the bottom side of the PCB board. The pins of external interface 5 include AUDIO_IN (module audio input), AUDIO_OUT (module audio output), PTT_OUT (module keying PTT signal output), UART_TX_3V3 (module serial output), and UART_RX_3V3 (module serial input).
[0038] The connector pinout for JL5-10TJB-1 is shown in Table 1:
[0039] Table 1: Connector Pins
[0040] Serial Number Definition Serial Number Definition 1 +5V 2 +5V 3 GND 4 GND 5 AUDIO IN 6 AUDIO OUT 7 PTT OUT 8 GND 9 UART TX 3V3 10 UART RX 3V3
[0041] During operation, the GD32F470 chip of the main MCU microcontroller acts as the transmitter (TX) chip, responsible for outputting the 801 waveform, PTT (Push-To-Talk) control, and external serial data transmission. PTT control is a crucial function in telegraph communication; by controlling the PTT signal, the sending and receiving of data can be switched. As the main chip, the transmitter chip undertakes the module's primary control and data output tasks, ensuring that telegraph signals are transmitted accurately.
[0042] See Figure 3 The software part implements the 801 algorithm function and is divided into a driver layer, a data processing layer and a business layer.
[0043] (1) I2S interface driver
[0044] Audio data read / write control.
[0045] (2) Serial port driver
[0046] Configure the operating parameters of the serial port interface chip and control the serial port data transmission.
[0047] (3) Audio data processing
[0048] Audio data processing, filtering, and 801 modulation and demodulation functions.
[0049] (4) Serial port data processing
[0050] Functions include serial port data protocol parsing and data packaging.
[0051] (5) Message services
[0052] Message data transmission control.
[0053] (6)ZSK
[0054] ZSK business control.
[0055] (7) Parameter Configuration
[0056] Parameter settings and query functions.
[0057] During use, when the system needs to send a text message, the business layer first packages the data according to the established protocol, then hands it over to the data processing layer for 801 waveform modulation, then the driver layer sends the modulated data stream to the audio codec to convert it into an analog signal, and finally transmits it through the external interface.
[0058] On the receiving end, the analog signal received from the external interface is first digitized by the audio codec, then demodulated by the data processing layer to recover the original information, and finally parsed by the business layer according to the protocol to extract the valid content and perform corresponding processing.
[0059] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A domestically produced telegraph transmission module, characterized in that: It includes a main MCU microcontroller (1), a slave MCU microcontroller (2), a first audio codec (3), a second audio codec (4), and an external interface (5); the main MCU microcontroller (1) is connected to the slave MCU microcontroller (2) and the external interface (5) through a serial port interface, the first audio codec (3) is connected to the main MCU microcontroller (1) and the external interface (5), and the second audio codec (4) is connected to the slave MCU microcontroller (2) and the external interface (5); the main MCU microcontroller (1) is a transmitting chip, responsible for the output of the 801 waveform, PTT control, and external serial port data transmission, and the slave MCU microcontroller (2) is a receiving chip, responsible for the demodulation of the channel 801 waveform.
2. The domestically produced telegraph transmission module according to claim 1, characterized in that: The main MCU microcontroller (1) uses a core processing chip of model GD32F470, and the slave MCU microcontroller (2) uses a core processing chip of model GD32F470.
3. The domestically produced telegraph transmission module according to claim 2, characterized in that: The first audio codec (3) uses an ES8311 audio codec chip. The first audio codec (3) is connected to the main MCU microcontroller (1) through the I2S interface, converts the digital waveform output by the main MCU microcontroller (1) into an analog audio signal, and sends it through the external interface (5).
4. The domestically produced telegraph transmission module according to claim 3, characterized in that: The second audio codec (4) uses an ES8311 audio codec chip. The second audio codec (4) is connected to the slave MCU microcontroller (2) through an I2S interface, converts the analog audio signal received from the external interface (5) into a digital signal and transmits it to the slave MCU microcontroller (2).
5. The domestically produced telegraph transmission module according to claim 4, characterized in that: The external interface (5) uses a plug-in connector for communication, and the connector with model number JL5-10TJB-1 is selected.
6. The domestically produced telegraph transmission module according to claim 5, characterized in that: The connector patch of the external interface (5) is mounted on the reverse side of the PCB board and is located in the center of the lower side of the PCB board.
7. A domestically produced telegraph transmission module according to claim 5, characterized in that: The external interface (5) pins include AUDIO_IN for module audio input, AUDIO_OUT for module audio output, PTT_OUT for module key control PTT signal output, UART_TX_3V3 for module serial port output, and UART_RX_3V3 for module serial port input.