Multi-channel short-wave modem

Abstract

The utility model discloses a multichannel short-wave modem, and belongs to the field of short-wave modulation and demodulation. Comprising an FPGA main control chip. The channel ports are respectively used for connecting a plurality of short-wave radio stations, and the channel ports support the input and output of four-line balanced audio signals and / or PTT control signals; the audio codec is in one-to-one correspondence with the channel ports, and the FPGA main control chip is in communication connection with the audio codec through an I2S interface; the PTT control circuits are in one-to-one correspondence with the channel ports, and the FPGA main control chip is connected with the PTT control circuits through IO interfaces. The multi-channel modem provided by the utility model can be connected with a plurality of short-wave radio stations and realize multi-task processing, thereby ensuring that the modem can be suitable for different communication scenes and requirements. Besides, through a convenient data transmission mode provided by the network interface, the user can remotely control the radio station and the modem by using the operation terminal, so that the practicability and the flexibility of the equipment are enhanced.

Description

Technical Field

[0001] The utility model belongs to the field of shortwave modulation and demodulation, in particular to a multi-channel shortwave modem. Background Art

[0002] Shortwave communications and their modem technology have undergone significant changes since the early 20th century. From early analog technology to the advent of digital modulation technology and now to software-defined methods, shortwave communications hardware has become increasingly simpler and more powerful. Advances in modems, especially in processing speed and the variety of modulation methods, have expanded the use cases of shortwave communications.

[0003] For some large communication stations and users who need remote monitoring and surveillance, the existing shortwave modems have exposed a series of limitations in actual applications, specifically in terms of operation complexity, communication efficiency, multi-tasking capabilities and user interactivity. These limitations have, to a certain extent, restricted the comprehensive performance of communication stations and their business expansion capabilities. Utility Model Content

[0004] In order to overcome the above technical defects, the utility model provides a multi-channel shortwave modem to solve the problems involved in the background technology.

[0005] The utility model provides a multi-channel shortwave modem, comprising:

[0006] FPGA master control chip;

[0007] A plurality of channel ports, each of which is used to connect to a plurality of shortwave radio stations;

[0008] A plurality of audio codecs, wherein the audio codecs correspond to the channel ports one by one, and the FPGA master control chip is connected to the audio codecs through an I2S interface;

[0009] A plurality of PTT control circuits are provided, wherein the PTT control circuits correspond to the channel ports one by one, and the FPGA main control chip is connected to the PTT control circuits via an IO interface.

[0010] Preferably or optionally, the FPGA main control chip adopts the JFM7K325T chip produced by Fudan Microelectronics.

[0011] Preferably or optionally, the audio codec is communicatively connected to the corresponding channel port via an operational amplifier.

[0012] Preferably or optionally, the audio codec uses an ES8388 AD / DA conversion chip as a core chip; and the operational amplifier is an SGM8261 operational amplifier.

[0013] Preferably or optionally, the PTT control circuit is connected to the channel port via an optocoupler circuit.

[0014] Preferably or optionally, it also includes: a network communication module of the system composed of a SG24301G network transformer and a RTL8211F Ethernet chip.

[0015] The RTL8211F Ethernet chip is connected to the FPGA main control chip through the MDI interface; the RTL8211F Ethernet chip is connected to the data network port through the SG24301G network transformer.

[0016] Preferably or optionally, a CH341 chip is also included, and the CH341 chip is connected to the FPGA main control chip via a USB interface.

[0017] Preferably or optionally, it also includes a power interface and a power module; the power interface is electrically connected to the FPGA main control chip and / or the audio codec and / or the PTT control circuit through the power module.

[0018] Preferably or optionally, the number of the channel ports, the audio codecs, and the PTT control circuits is 2-10.

[0019] Preferably or optionally, the number of the channel ports, the audio codec, and the PTT control circuit are all 8.

[0020] The utility model relates to a multi-channel shortwave modem, which has the following beneficial effects compared to the prior art: the utility model provides a multi-channel modem, which can connect multiple shortwave radio stations and realize multi-tasking, ensuring that the modem can be applied to different communication scenarios and needs. In addition, the convenient data transmission method provided by the network interface enables users to remotely control the radio station and modem using an operating terminal, thereby enhancing the practicality and flexibility of the device. It can effectively solve the shortcomings of existing shortwave modems in terms of operational complexity, communication efficiency, multi-tasking capability and user interactivity, and provide a powerful tool for large communication stations and users who need remote monitoring and surveillance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the hardware structure of the utility model Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the hardware structure of the utility model Figure 2 .

[0023] The accompanying drawings are marked as follows: 1. FPGA main control chip; 2. Channel port; 3. Audio codec; 4. Operational amplifier; 5. PTT control circuit; 6. Network transformer; 7. Ethernet chip; 8. Data network port; 9. CH341 chip; 10. Debug serial port; 11. Power interface; 12. Power module. DETAILED DESCRIPTION

[0024] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0025] See attached Figures 1 to 2 , a multi-channel shortwave modem, comprising: an FPGA main control chip 1, a plurality of channel ports 2, a plurality of audio codecs 3, a plurality of operational amplifiers 4, a plurality of PTT control circuits 5, a network transformer 6, an Ethernet chip 7, an AC220V power interface 11 and an AC-DC power module 12;

[0026] The FPGA main control chip 1 is the core of the system and is responsible for executing the modulation and demodulation algorithm of the signal, processing user instructions, controlling the data flow, and managing the communication with the external interface. In this embodiment, the FPGA main control chip 1 adopts the JFM7K325T chip produced by Fudan Microelectronics.

[0027] The channel port 2 provides a physical connection point, supports the input and output of 4-wire balanced audio signals and PTT control signals, and is used to connect multiple shortwave radio stations; the number of the channel ports 2 is 2 to 10, preferably 8. The eight-channel interface design is adopted, which can simultaneously process the input and output of eight balanced audio signals.

[0028] The audio codec 3 corresponds to the channel port 2 one by one, and the FPGA main control chip 1 is connected to the audio codec 3 through the I2S interface to control the digital to analog conversion and reverse conversion of the audio signal. The audio codec 3 uses the ES8388 AD / DA conversion chip as the core chip. The audio codec 3 can convert digital audio signals into analog signals for transmission by the shortwave radio station, and convert analog signals received by the shortwave radio station into digital signals for FPGA processing.

[0029] The operational amplifier 4 is an SGM8261 operational amplifier 4. The audio codec 3 is connected to the corresponding channel port 2 through the operational amplifier 4. The SGM8261 operational amplifier 4 is used to amplify the audio signal to ensure the quality and strength of the audio signal during transmission.

[0030] The PTT control circuit 5 corresponds to the channel port 2 one by one, and the FPGA main control chip 1 is connected to the PTT control circuit 5 through the IO interface. The FPGA main control chip 1 directly manages the PTT signal through the PTT control circuit 5 to control the transmission state of the shortwave radio station. At the same time, the PTT control circuit 5 is connected to the channel port 2 through an optical coupling circuit for electrical isolation to prevent interference factors such as high voltage, surge, and noise from being reversely transmitted from the radio side to the PTT control circuit 5 to protect the system.

[0031] The multi-channel shortwave modem of this embodiment can connect multiple shortwave radio stations and realize multitasking. The modulation waveforms provided include: frequency shift keying (FSK) data transmission, multi-carrier parallel data transmission, single-carrier serial data transmission, orthogonal spread spectrum (QSS) data transmission, and single-carrier frequency domain equalization broadband high-speed data transmission. Each channel supports 4-wire balanced transmission, which can effectively reduce signal loss and noise interference during transmission. In addition, each channel also has the output function of PTT (Push-to-Talk) control signal, allowing the user to control the transmission status of the shortwave radio station through keying operation. This design greatly improves the communication efficiency and reliability of the equipment and meets the needs of complex communication scenarios.

[0032] The network transformer 6 is a SG24301G network transformer 6, and the Ethernet chip is a RTL8211F Ethernet chip 7. The SG24301G network transformer 6 and the RTL8211F Ethernet chip 7 constitute a network communication module of the system. The system is provided with network communication capability. The RTL8211F Ethernet chip 7 is connected to the FPGA main control chip 1 through the MDI interface; the RTL8211F Ethernet chip 7 is connected to the data network port 8 through the SG24301G network transformer 6 to realize the communication function of the data network port 8 and support remote control and data exchange of users.

[0033] The CH341 chip 9 is a USB interface adapter chip. One end of the CH341 chip 9 is connected to the debug serial port 10, and the other end is connected to the FPGA main control chip 1 through the USB interface. The FPGA main control chip 1 is connected through the USB interface to provide a debugging interface for debugging and configuration of the device.

[0034] The power interface is an AC220V power interface 11, and the power module is an AC-DC power module 12. The AC220V power interface 11 is electrically connected to the FPGA main control chip 1 and / or the audio codec 3 and / or the PTT control circuit 5 through the AC-DC power module 12. The AC220V power interface 11 and the AC-DC power module 12 provide the power required by the system, converting the external 220V alternating current into the low-voltage direct current required by the internal circuit, and providing power for all the above components.

[0035] In order to facilitate the understanding of the technical solution of the multi-channel shortwave modem, a brief description of its data sending process and data receiving process is given:

[0036] During the data transmission process, the user issues a data transmission instruction through the data network port 8, and the instruction is transmitted to the FPGA main control chip 1 through the RTL8211F Ethernet chip 7 and the SG24301G network transformer 6; the FPGA main control chip 1 runs the signal modulation algorithm according to the received instruction, generates the corresponding digital audio signal, and sends it to the ES8388 audio codec 3 through the I2S interface; the ES8388 audio codec 3 converts the digital signal into an analog signal, amplifies it through the SGM8261 operational amplifier 4, and outputs it to the shortwave radio through the channel port 2; at the same time, the FPGA main control chip 1 controls the PTT control circuit 5 to pull the PTT signal low, and outputs it to the shortwave radio after optical coupling isolation, so that the radio enters the sending state.

[0037] During the data reception process, the shortwave radio station receives an analog audio signal and transmits it to the SGM8261 operational amplifier 4 through the channel port 2; the SGM8261 operational amplifier 4 amplifies the signal and transmits it to the ES8388 audio codec 3; the ES8388 audio codec 3 samples the analog signal, converts it into a digital signal, and sends it to the FPGA main control chip 1 through the I2S interface; the FPGA main control chip 1 runs the demodulation algorithm, processes the signal, and provides the demodulated data to the user for reference through the data network port 8 (via the RTL8211F Ethernet chip 7 and the SG24301G network transformer 6).

[0038] Among them, the demodulation algorithm run by the FPGA main control chip 1 is selected according to the standards and requirements of the communication system, and the demodulation algorithm includes but is not limited to fusion frequency shift keying (FSK), multi-carrier parallel data transmission, single-carrier serial data transmission, orthogonal spread spectrum (QSS) and single-carrier frequency domain equalization broadband high-speed data transmission and other technologies. The demodulation algorithms are all existing algorithms in this field and are not described in detail here. Similarly, the RTL8211F Ethernet chip 7, ES8388 audio codec 3, SGM8261 operational amplifier 4, and PTT control circuit 5 are also existing algorithms in this field and are not described in detail here.

[0039] This entire process ensures that from the receipt of user instructions to the sending and receiving of data, the entire system can efficiently and collaboratively process multi-channel shortwave communication signals.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A multi-channel shortwave modem, characterized in that: include: FPGA master control chip; A plurality of channel ports, each of which is used to connect to a plurality of shortwave radio stations; A plurality of audio codecs, wherein the audio codecs correspond to the channel ports one by one, and the FPGA master control chip is connected to the audio codecs through an I2S interface; A plurality of PTT control circuits are provided, wherein the PTT control circuits correspond to the channel ports one by one, and the FPGA main control chip is connected to the PTT control circuits via an IO interface.

2. The multi-channel shortwave modem according to claim 1, characterized in that: The FPGA main control chip adopts the JFM7K325T chip produced by Fudan Microelectronics.

3. The multi-channel shortwave modem according to claim 1, characterized in that: The audio codec is communicatively connected to the corresponding channel port via an operational amplifier.

4. The multi-channel shortwave modem according to claim 3, characterized in that: The audio codec uses the ES8388 AD / DA conversion chip as the core chip; the operational amplifier is the SGM8261 operational amplifier.

5. The multi-channel shortwave modem according to claim 1, characterized in that: The PTT control circuit is connected to the channel port through an optical coupling circuit.

6. The multi-channel shortwave modem according to claim 1, characterized in that: Also includes: The network communication module of the system is composed of SG24301G network transformer and RTL8211F Ethernet chip; The RTL8211F Ethernet chip is connected to the FPGA main control chip through the MDI interface; the RTL8211F Ethernet chip is connected to the data network port through the SG24301G network transformer.

7. The multi-channel shortwave modem according to claim 1, characterized in that: It also includes a CH341 chip, which is connected to the FPGA main control chip through a USB interface.

8. The multi-channel shortwave modem according to claim 1, characterized in that: It also includes a power supply interface and a power supply module; the power supply interface is electrically connected to the FPGA main control chip and / or the audio codec and / or the PTT control circuit through the power supply module.

9. The multi-channel shortwave modem according to claim 1, characterized in that: The number of the channel ports, audio codecs, and PTT control circuits is 2 to 10.

10. The multi-channel shortwave modem according to claim 9, characterized in that: The number of the channel ports, the audio codec, and the PTT control circuit are all 8.

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