Circuit for frequency modulation broadcasting newly-added service

Abstract

The utility model discloses a circuit used for frequency modulation broadcast newly-added service, and relates to the technical field of broadcast communication. The circuit comprises an interface module, a first FPGA module, a first ADC module, a second FPGA module and a signal output module. The interface module is used for acquiring new business data; the first FPGA is used for performing channel coding modulation processing on the new service data according to the channel characteristics of the new service data to obtain new service modulation data; the first ADC module is used for acquiring an original radio frequency signal and performing analog-to-digital conversion processing to obtain an original radio frequency digital signal; the second FPGA module is used for adding the new service modulation data to one side or two sides of a frequency modulation signal channel corresponding to the original radio frequency digital signal to obtain a first combined signal; and the signal output module is used for converting the first combined signal into a first radio frequency emission signal and outputting the first radio frequency emission signal. According to the utility model, the utilization efficiency of frequency resources can be improved, the demand for newly added frequency resources is reduced, and the problem of frequency resource shortage is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a broadcast communication technical field especially is related to a circuit for the frequency modulation broadcast new service. BACKGROUND

[0002] Since the birth of frequency modulation (FM) broadcast technology in the early 20th century, it has undergone rapid development and wide application. As a form of radio broadcast, FM broadcast has become one of the important channels for people to obtain information and entertainment. After decades of construction and optimization, the coverage network of FM broadcast has spread all over the place, and people in both cities and remote rural areas can receive FM broadcast signals.

[0003] In related technologies, the channel spacing standard of FM broadcast is 100 kHz, which is formulated by the International Telecommunication Union (ITU) to ensure that different broadcast stations can be isolated from each other and avoid mutual interference. Each FM broadcast station will be allocated a specific frequency within its allocated frequency band, with a 100 kHz interval, to ensure that each station has an independent frequency band for broadcasting.

[0004] With the passage of time, FM broadcast technology has been widely applied, especially in cars, homes and portable radios. This has led to an increasing demand for FM broadcast frequency resources. In some areas, especially in densely populated and economically developed areas, the occupancy rate of frequency resources is getting higher and higher, leading to a shortage of available frequency resources. CONTENT OF THE UTILITY MODEL

[0005] In view of the above technical problems and defects, the purpose of the utility model is to provide a circuit for the frequency modulation broadcast new service, which can improve the utilization efficiency of frequency resources, reduce the demand for new frequency resources, and alleviate the problem of frequency resource shortage.

[0006] In order to achieve the above object, the utility model provides a circuit for frequency modulation broadcast new service, including interface module, first FPGA module, first ADC module, second FPGA module and signal output module, interface module is used to obtain new service data, first FPGA module is connected with the interface module, is used to according to the channel characteristic of new service data carries out channel coding modulation processing to the new service data, obtains new service modulation data, first ADC module is used to obtain original radio frequency signal, and the original radio frequency signal is handled to analog -to -digital conversion, obtains original radio frequency digital signal, second FPGA module is connected with the first ADC module and the first FPGA module respectively, is used to increase the new service modulation data to the one side or two sides of the original radio frequency digital signal corresponding frequency modulation signal channel, obtains first combined signal, signal output module is connected with the second FPGA module, is used to convert the first combined signal into first radio frequency transmitting signal and output.

[0007] The utility model discloses through interface module obtains new service data, and first FPGA module is responsible according to the channel characteristic and is handled to channel coding and modulation, generates the new service modulation data suitable for transmission. First ADC module is followed and converts the original analog radio frequency signal into digital signal, and provides the basis for signal processing. The second FPGA module as the core of system, carries out the combined processing to the new service modulation data and original radio frequency digital signal, so that the new and old signal can coexist in the same frequency bandwidth, and need not additional frequency resource. Signal output module finally converts the combined signal into radio frequency transmitting signal, and completes the emission of signal. The design of this embodiment improves the utilization efficiency of frequency resource, reduces the demand to new frequency resource, alleviates the problem of frequency resource shortage, realizes the optimal allocation and efficient utilization of frequency resource.

[0008] In some embodiments, the circuit further comprises a second ADC module for collecting new service radio frequency signals from the outside and performing analog-to-digital conversion on the new service radio frequency signals to obtain new service radio frequency digital signals; the second FPGA module is further connected with the second ADC module for adding the new service radio frequency digital signals to one side or both sides of the frequency modulation signal channel to obtain a second combined signal; and the signal output module is further configured to convert the second combined signal into a second radio frequency transmitting signal for output.

[0009] By introducing the second ADC module, the integration capability of the system for external new service radio frequency signals is expanded. This design can not only process internally generated new service data, but also flexibly process external source radio frequency signals. The second FPGA module is responsible for combining these external signals into the frequency modulation signal channel, increasing the adaptability and flexibility of the system. In addition, the signal output module can convert the combined second combined signal into a radio frequency transmission signal, further enhancing the output capability of the system. This design meets the diversified service demand, improves the practicality and expansibility of the circuit.

[0010] In some embodiments, the circuit further comprises a third ADC module for collecting a power amplifier feedback signal corresponding to the first combined signal or the second combined signal, and a DPD processing module for pre-distortion processing the first combined signal or the second combined signal according to the power amplifier feedback signal.

[0011] By increasing the third ADC module and the DPD processing module, the signal transmission quality is significantly improved. The third ADC module is responsible for collecting the power amplifier feedback signal, and the DPD processing module performs pre-distortion processing on the combined signal according to the feedback signal, effectively compensating for the nonlinear distortion introduced by the power amplifier. This advanced processing technology optimizes the transmission characteristics of the signal, improves the reliability and transmission efficiency of the signal. By reducing distortion, the circuit can provide higher quality broadcast signals, thereby improving the user's reception experience.

[0012] In some embodiments, the circuit further comprises a coupler for receiving an original FM signal and performing coupling processing on the original FM signal to obtain a first component signal, and transmitting the first component signal as the original radio frequency signal to the first ADC module.

[0013] By introducing the coupler, the first component signal is separated from the original FM signal for analog-to-digital conversion by the first ADC module. This design allows the system to obtain and process an accurate copy of the original FM signal without affecting the transmission of the original signal. The use of the coupler improves the accuracy and reliability of signal processing, ensuring the integrity of the original FM signal during conversion and processing, and providing high-quality input for subsequent signal processing and combining.

[0014] In some embodiments, the circuit further comprises a coaxial switch, the coupler is further configured to perform coupling processing on the original FM signal to obtain a second component signal, and the coaxial switch is connected with the signal output module and the coupler respectively, and is configured to switch output between the first radio frequency transmission signal and the second component signal, or switch output between the second radio frequency transmission signal and the second component signal.

[0015] The coaxial switch provides flexibility in signal routing for the system. It can switch between the second component signal of the original FM signal and the two radio frequency transmission signals, allowing the system to select the output signal as needed. This design not only improves the reliability of the circuit, but also allows fast switching between different signals to cope with different broadcasting needs or faults in the signal processing process.

[0016] In some embodiments, the circuit further includes a circulator connected between the coupler and the coaxial switch.

[0017] The above-mentioned technical solutions of the embodiments add a circulator between the coupler and the coaxial switch, enhancing the unidirectionality and isolation of signal transmission. The characteristics of the circulator prevent reverse transmission of signals, reducing signal reflection and interference, thereby improving the transmission quality of signals and the overall performance of the system. This design is crucial for maintaining signal stability and improving the anti-interference ability of the circuit.

[0018] In some embodiments, the signal output module includes a DAC conversion module and an up-conversion module. The DAC conversion module is used to perform digital-to-analog conversion processing on the first or second combined signal to obtain an analog baseband signal. The up-conversion module is used to perform up-conversion processing on the analog baseband signal to obtain the first or second radio frequency transmission signal.

[0019] The above-mentioned technical solutions of the embodiments include a DAC conversion module and an up-conversion module in the signal output module, which is responsible for converting digital combined signals into analog signals and up-converting them to the radio frequency range. This design ensures the correct format and frequency of the signal before transmission, while ensuring the quality of the signal. Through precise digital-to-analog conversion and up-conversion processing, the circuit can efficiently generate radio frequency transmission signals, providing a solid foundation for high-quality wireless broadcasting.

[0020] In some embodiments, the signal output module further includes a signal amplification module connected to the up-conversion module for amplifying the first or second radio frequency transmission signal.

[0021] The above-mentioned technical solutions of the embodiments introduce a signal amplification module to amplify the radio frequency transmission signal after up-conversion, ensuring that the signal has sufficient power level for effective transmission. This design improves the transmission range and coverage area of the signal, ensuring long-distance transmission and wide reception area of the signal. The use of the signal amplification module is crucial for improving the coverage range and quality of the broadcast signal.

[0022] In some embodiments, the signal output module further comprises a signal filtering module connected with the signal amplification module, configured to filter the amplified first radio frequency transmission signal or the second radio frequency transmission signal.

[0023] By adopting the technical solutions of the above embodiments, the signal filtering module filters the amplified radio frequency transmission signal to remove unwanted frequency components and noise. This design improves the purity and stability of the signal, ensuring high-quality wireless transmission. Through filtering, the circuit can provide clear and interference-free broadcast signals, thereby improving the user's reception experience.

[0024] In some embodiments, the circuit further comprises a clock module configured to provide a clock signal to the first FPGA module and the second FPGA module.

[0025] By adopting the technical solutions of the above embodiments, the clock module provides a unified clock signal for the entire system, ensuring the synchronous operation between modules. This design improves the stability and processing efficiency of the system, ensuring the accurate timing of signal processing. The clock module can also be locked with an external reference source, further improving the clock accuracy and stability of the circuit, providing a guarantee for high-quality signal processing and transmission.

[0026] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0027] 1. The present application realizes the integration of new service data into existing FM broadcast signals without additional frequency resource occupation through ingenious circuit design. Through the cooperative work of the first FPGA and the second FPGA module, the new service data is encoded, modulated, and combined with the original radio frequency signal to form a composite signal containing rich information. This design significantly improves the utilization efficiency of frequency resources, while expanding the business scope of FM broadcast, enabling a single frequency channel to transmit more service content.

[0028] 2. The quality and integrity of the signal at each stage are ensured. From the analog-to-digital conversion of the ADC module to the digital-to-analog conversion of the DAC module, and then to the frequency conversion of the up-conversion module, each step is optimized for signal quality through precise circuit design. In particular, the pre-distortion processing of the DPD processing module effectively compensates for the nonlinear distortion introduced by the power amplifier, ensuring high fidelity of the signal during transmission. In addition, the signal amplification module and the filtering module further improve the transmission power and purity of the signal, thereby improving the transmission distance and reception quality of the signal.

[0029] 3. Through the use of couplers and coaxial switches, the present application can flexibly manage signal flow, enabling effective routing and backup of signals. The introduction of circulators enhances the unidirectionality of signal transmission, reducing signal reflection and interference. The design of the clock module takes into account synchronization with external reference sources, improving the time accuracy and stability of the system. In addition, the system design allows for the selection of different signal outputs as needed, such as switching between internal and external new service signals, ensuring that the circuit remains continuous and reliable in the face of failures or maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. It is clear that the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor. In the drawings:

[0031] Figure 1 is a schematic diagram of a circuit for adding new services to a frequency modulation broadcast according to an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of another circuit for adding new services to a frequency modulation broadcast according to an embodiment of the present application;

[0033] Figure 3 is a radio frequency signal spectrum distribution diagram according to an embodiment of the present application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 101, interface module; 102, first FPGA module; 201, first ADC module; 202, second FPGA module; 203, second ADC module; 203, third ADC module; 205, DPD processing module; 301, coupler; 302, coaxial switch; 303, circulator; 304, clock module; 310, signal output module; 311, DAC conversion module; 312, up-conversion module; 313, signal amplification module; 314, signal filtering module. DETAILED DESCRIPTION

[0036] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments of the present application, and are not intended to be limiting to the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an," and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the term "or" as used in the present application refers to any or all possible combinations of one or more of the listed items. Hereinafter, the terms "first" and "second" are used only for the purpose of description, to distinguish technical features, and cannot be understood as implying relative importance or implicitly indicating the number of indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0037] It should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected" and the like in the embodiments of the present application should be broadly understood, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the communication between the two elements inside; can be wireless communication connection, or wired communication connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application are described in detail as follows.

[0038] The embodiment of the present application provides a circuit for adding new services of frequency modulation broadcast, as shown in the figure, comprising an interface module 101, a first FPGA module 102, a first ADC module 201, a second FPGA module 202 and a signal output module 310. Figure 1

[0039] The interface module 101 is used for acquiring new service data.

[0040] Specifically, the interface module 101 is a key part of the frequency modulation broadcast new service circuit responsible for data input. The interface module 101 receives new service data from different sources through general interfaces such as network ports and serial ports. These data may include digital audio, text information or image and other multimedia content. The interface module 101 has data conversion processing function, which can format and adapt the received data to meet the requirements of subsequent processing modules. Conversion processing may involve protocol analysis, data encapsulation, synchronization and error detection steps to ensure data integrity and availability.

[0041] The interface module 101 not only improves the flexibility and expansibility of the system, but also provides a stable and reliable platform for the integration and transmission of new service data.

[0042] ​The first FPGA module 102 is connected with the interface module 101, and is configured to perform channel coding and modulation on the new service data according to the channel characteristics of the new service data, to obtain new service modulation data.

[0043] The first FPGA module 102 is configured to implement customized digital circuit functions by programming the internal logic circuit based on FPGA (Field-Programmable Gate Array) technology.

[0044] Specifically, the first FPGA module 102 is the core component in the circuit of the embodiment, and is configured to perform channel coding and modulation on the new service data. The first FPGA module 102 is directly connected with the interface module 101, and receives the new service data preprocessed and converted by the interface module 101. The first FPGA module 102 performs channel coding and modulation tasks by using a digital signal processing algorithm according to the characteristics of the new service data and channel conditions. Channel coding aims to increase redundancy to improve the reliability of data transmission, and modulation is to map the coded data into a signal form suitable for wireless transmission. This process ensures that the data can be efficiently and accurately transmitted within a specific frequency bandwidth, while meeting the technical standards and regulatory requirements of frequency modulation broadcasting.

[0045] Through precise timing control and data processing capability, the first FPGA module 102 can convert the new service data into modulation data, which prepares for subsequent signal combining and transmission, so as to realize effective integration and expansion of new services without interfering with existing frequency modulation broadcasting signals.

[0046] The first ADC module 201 is configured to obtain the original radio frequency signal and perform analog-to-digital conversion on the original radio frequency signal to obtain the original radio frequency digital signal.

[0047] The first ADC (Analog-to-Digital Converter) module is configured to convert the received analog form of the original radio frequency signal into a digital signal for subsequent digital signal processing. This process includes sampling the continuous waveform of the radio frequency signal, and converting the amplitude of the analog signal into discrete digital values according to a specific sampling rate and quantization bit number. In this way, the first ADC module 201 can accurately capture the characteristics of the original radio frequency signal and convert it into a series of digital samples to generate the original radio frequency digital signal. These digital samples retain all the information of the original signal and can be further processed by a digital processing system, such as filtering, decoding or other forms of signal processing.

[0048] The high precision and high speed of the first ADC module 201 are crucial for ensuring that the signal is not distorted during conversion and for meeting the broadcast quality standards. Through this analog-to-digital conversion, the original radio frequency signal is prepared for further processing by the first FPGA module 102, laying a solid foundation for the integration of new service data and high-quality signal transmission.

[0049] The second FPGA module 202 is connected to the first ADC module 201 and the first FPGA module 102, respectively, for adding new service modulation data to one side or both sides of the original radio frequency digital signal corresponding to the frequency modulation signal channel, obtaining a first combined signal.

[0050] Among them, the second FPGA module 202 is a key component for signal combination in the frequency modulation broadcast new service circuit, which is responsible for effectively integrating the new service modulation data processed by the first FPGA module 102 and the original radio frequency digital signal converted by the first ADC module 201.

[0051] The second FPGA module 202 plays a core role in signal combination in the frequency modulation broadcast new service circuit. It receives new service modulation data processed by the first FPGA module 102 and original radio frequency digital signals converted by the first ADC module 201. The new service modulation data is a digital signal that has been channel encoded and modulated, ready to be merged with the original signal. The original radio frequency digital signal is a digital signal converted from the analog radio frequency signal, representing the current FM content being broadcast.

[0052] Specifically, the second FPGA module 202 uses digital signal processing technology to accurately place the new service modulation data in the upper sideband or lower sideband of the original radio frequency digital signal spectrum, or in both sidebands. This usually involves shifting the frequency of the new service modulation data to match the frequency of the original frequency modulation signal channel. In the digital domain, this can be achieved through digital up-conversion technology, which uses a digital mixer to shift the frequency of the new service data upwards.

[0053] During the combination process, the second FPGA module 202 needs to ensure that the power level and phase of the new service signal match those of the original signal to avoid mutual interference and ensure signal quality. The combined signal, i.e., the first combined signal, contains both the original audio broadcast content and the new service data, providing listeners with more information. The digital processing capability of the second FPGA module 202 ensures the accurate generation of the combined signal, preparing for subsequent signal transmission.

[0054] Through this processing, the resulting combined signal not only contains the original audio broadcast content but also incorporates rich new service data, thereby expanding the service range and user experience of FM broadcasting. Ultimately, this combined signal will be used for radio frequency transmission, enabling users at the receiving end to enjoy both traditional broadcast services and newly added data services such as traffic information, weather updates, or Internet data streams, etc.

[0055] The signal output module 310 is connected with the second FPGA module 202, and is configured to convert the first combined signal into a first radio frequency transmission signal for output.

[0056] The signal output module 310 is a key part of the FM broadcast new service circuit responsible for final signal processing and transmission. It is connected with the second FPGA module 202 and is responsible for converting the combined digital signal into a radio frequency transmission signal suitable for wireless transmission. The signal output module 310 ensures that the first combined signal can be effectively output in the form of high-quality radio frequency transmission signals.

[0057] In this embodiment, the above-mentioned circuit is adopted. After obtaining the new service data through the interface module 101, the first FPGA module 102 is responsible for channel coding and modulation according to the channel characteristics to generate new service modulation data suitable for transmission. The first ADC module 201 then converts the original analog radio frequency signal into a digital signal to provide a basis for signal processing. The second FPGA module 202, as the core of the system, performs combined processing on the new service modulation data and the original radio frequency digital signal, so that the new and old signals can coexist in the same frequency bandwidth without additional frequency resources. The signal output module 310 finally converts the combined signal into a radio frequency transmission signal to complete the transmission of the signal. This design of the embodiment improves the utilization efficiency of frequency resources, reduces the demand for additional frequency resources, alleviates the problem of tight frequency resources, and realizes the optimal allocation and efficient use of frequency resources.

[0058] In some embodiments, as shown in Figure 2 The circuit for FM broadcast new services also includes one or more of a second ADC module 203, a third ADC module 204, a DPD processing module 205, a coupler 301, a coaxial switch 302, a circulator 303, and a clock module 304.

[0059] In some embodiments, the second ADC module 203 is configured to collect a new service radio frequency signal from outside and perform analog-to-digital conversion on the new service radio frequency signal to obtain a new service radio frequency digital signal; the second FPGA module 202 is further connected to the second ADC module 203 and configured to add the new service radio frequency digital signal to one side or both sides of the frequency modulation signal channel to obtain a second combined signal; and the signal output module 310 is further configured to convert the second combined signal into a second radio frequency transmission signal for output.

[0060] To further enhance the integration capability of the new service data, the second ADC module 203 is added in the embodiment, which is configured to collect a new service radio frequency signal transmitted from outside. The second ADC module 203 performs an analog-to-digital conversion task to convert the collected new service radio frequency signal in the form of an analog signal into a digital signal, thereby obtaining a new service radio frequency digital signal. This conversion is crucial because it allows the digital signal processing flow to further operate and control the new service signal.

[0061] The converted new service radio frequency digital signal is sent to the second FPGA module 202, which is responsible for not only processing the original radio frequency digital signal from the first ADC module 201 but also processing the new service radio frequency digital signal from the second ADC module 203. The second FPGA module 202 performs a combining process on the original radio frequency digital signal and the new service radio frequency digital signal, i.e., adds the new service radio frequency digital signal to one side or both sides of the original frequency modulation signal channel to generate a second combined signal. This processing method not only ensures the transmission of the new service signal but also ensures that it can effectively coexist with the existing frequency modulation broadcast signal in the same frequency band.

[0062] Then, the signal output module 310 converts the second combined signal into a second radio frequency transmission signal that can be transmitted.

[0063] In some embodiments, the frequency spectrum distribution diagrams of the first combined signal and the second combined signal can refer to Figure 3 Figure 3 In the diagrams, SBL1 and SBL2 represent sidebands located below the frequency point of the original FM signal, and SBU1 and SBU2 represent sidebands located above the frequency point of the original FM signal. The new service data or the new service radio frequency signal can be located in the frequency spectrum region represented by SBL1, SBL2, SBU1, or SBU2 in the combining process.

[0064] In some embodiments, the third ADC module 204 is configured to collect a power amplifier feedback signal corresponding to the first combined signal or the second combined signal, and the DPD processing module 205 is configured to perform a pre-distortion process on the first combined signal or the second combined signal according to the power amplifier feedback signal.

[0065] ​In this embodiment, the third ADC module 204 and the DPD processing module 205 are connected to ensure the quality and stability of the signal, especially after the signal passes through the power amplifier (PA), the DPD (Digital Predistortion) processing is performed to reduce the signal nonlinear distortion caused by the PA.

[0066] Specifically, the role of the third ADC module 204 is to collect the feedback signal of the signal after the PA, that is, the first combined signal or the second combined signal, and convert it into a digital form to facilitate accurate digital signal processing.

[0067] The PA usually has nonlinear characteristics, which will introduce distortion in the signal amplification process, especially when the signal contains large amplitude fluctuations. In order to compensate for this nonlinear distortion, the DPD processing module 205 is introduced into the circuit. The DPD processing module 205 analyzes the PA feedback signal collected by the third ADC module 204 to identify the nonlinear distortion characteristics introduced by the PA. Based on these analysis results, the DPD module uses the DPD algorithm to generate a pre-distortion signal that is opposite in characteristics to the distortion introduced by the PA.

[0068] Subsequently, the DPD processing module 205 combines this pre-distortion signal with the original combined signal (first combined signal or second combined signal) to pre-adjust the signal in digital form, so that when the signal passes through the PA, it can offset the expected nonlinear distortion. This pre-distortion processing is an adaptive feedback control mechanism that can dynamically adjust the pre-distortion coefficient to adapt to different signal conditions and PA characteristics.

[0069] Through this design, the circuit of this embodiment not only ensures the quality and integrity of the signal after passing through the PA, but also improves the efficiency and linearity of the PA, thereby optimizing the performance of the entire broadcast link. The application of DPD technology significantly improves the transmission quality of the signal, ensuring the reliability and stability of the new FM broadcast service, and maintaining high-quality broadcast signal transmission even in complex signal environments.

[0070] In some embodiments, the coupler 301 is used to receive the original FM signal and perform coupling processing on the original FM signal to obtain a first component signal, and then transmit the first component signal as an original radio frequency signal to the first ADC module 201.

[0071] The coupler 301 is used to effectively separate the original FM signal. The coupler 301 receives the complete original FM signal from the broadcast transmission link, which contains all the audio content to be broadcast. Through a carefully designed coupling process, the coupler 301 can separate a portion of the energy from this complete original FM signal to obtain a first component signal with the same information as the original signal, while ensuring the quality and integrity of the component signal.

[0072] This first component signal is an exact copy of the original FM signal, which retains all the characteristics of the original signal, including frequency, phase and amplitude parameters. The first component signal output by the coupler 301 is then transmitted to the first ADC module 201, which is responsible for converting the analog form of the radio frequency signal into digital form. The analog-to-digital conversion process is a key step in signal digitization, which allows the second FPGA module 202 to further process and analyze the signal.

[0073] Through the use of the coupler 301, this embodiment not only ensures the integrity and availability of the original FM signal, but also provides high-quality input for signal digitization and subsequent processing. This design method ensures the fidelity of the signal in the conversion process, laying the foundation for high-quality signal processing and transmission. The introduction of the coupler 301 improves the flexibility and reliability of the entire system, allowing new services to be seamlessly integrated into existing frequency modulation broadcast systems.

[0074] In some embodiments, the coupler 301 is also used to couple the original FM signal to obtain a second component signal, and the coaxial switch 302 is connected to the signal output module 310 and the coupler 301, respectively, for switching output between the second component signal and the first radio frequency transmission signal, or switching output between the second component signal and the second radio frequency transmission signal.

[0075] In this embodiment, the coupler 301 can separate a relatively small first component signal and a relatively large second component signal through coupling processing of the original FM signal.

[0076] Specifically, the coupler 301 allows a portion of the signal energy in the original FM signal to pass through, forming a smaller first component signal, which is used as an original radio frequency digital signal to be transmitted to the first ADC module 201 for analog-to-digital conversion.

[0077] Meanwhile, the coupler 301 preserves most of the signal energy as a larger second component signal, which can be used for other purposes, such as transmission to the coaxial switch 302 for further signal routing selection. This separation ensures the integrity of the original FM signal and the flexibility of the system, allowing the circuit to handle both the digital conversion and backup or routing needs of the signal simultaneously, thereby improving the efficiency and reliability of signal processing.

[0078] The coaxial switch 302 is then used for signal selection and routing. The coaxial switch 302 is connected to the signal output module 310 and the coupler 301, respectively, and has the ability to switch between the second component signal and the radio frequency transmission signal (either the first radio frequency transmission signal or the second radio frequency transmission signal). This design provides great flexibility and redundancy, ensuring that the broadcast system can seamlessly switch between different signal paths.

[0079] For example, under normal operating conditions, the coaxial switch 302 can route the second component signal to the same path as the first radio frequency transmission signal for transmission. If the first radio frequency transmission signal needs to be replaced or interrupted for some reason (such as signal processing problems or transmission errors), the coaxial switch 302 can quickly switch to the second radio frequency transmission signal, ensuring the continuity and reliability of the broadcast. Similarly, if a new service signal needs to be integrated into the broadcast, the coaxial switch 302 can also switch the second component signal with the second radio frequency transmission signal to achieve a smooth transition between old and new signals.

[0080] This design allows the system to maintain broadcast stability and continuity when facing failures or maintenance, while providing a mechanism to test and verify the integration of new service signals. Through the coordinated work of the coupler 301 and the coaxial switch 302, the circuit can flexibly manage signal flow, optimize signal transmission strategies, and ensure high-quality broadcast output without interrupting service.

[0081] In some embodiments, the circulator 303 is connected between the coupler 301 and the coaxial switch 302.

[0082] The connection of the circulator 303 between the coupler 301 and the coaxial switch 302 provides a non-reciprocal signal transmission path. The second component signal generated by the coupler 301 passes through the circulator 303, and the characteristics of the circulator 303 make the signal transmission unidirectional. This means that the second component signal can be smoothly transmitted from the coupler 301 to the coaxial switch 302, while any signal transmission from the coaxial switch 302 to the coupler 301 is blocked.

[0083] This unidirectional transmission characteristic is crucial for maintaining signal integrity and preventing signal reflection. In practical applications, the circulator 303 can effectively isolate different parts of the signal path, reducing problems caused by signal reflection or interference, such as standing waves, increased noise, or system performance degradation. In addition, the use of the circulator 303 improves the reliability and stability of the signal processing system, as it ensures the consistency and predictability of the signal during transmission.

[0084] By placing the circulator 303 between the coupler 301 and the coaxial switch 302, the circuit achieves effective management and control of the signal, enabling the system to maintain high performance and efficiency when performing signal switching or other signal processing tasks. The introduction of the circulator 303 enhances the signal processing capabilities of the entire circuit, ensuring the quality and stability of the signal during transmission, which is of great significance for improving the reliability and efficiency of the entire FM broadcast system.

[0085] In some embodiments, the clock module 304 is used to provide clock signals to the first FPGA module 102 and the second FPGA module 202.

[0086] Among them, the clock signal is the key signal for synchronous operation and processing operation in the circuit of this embodiment, which determines the beat and timing of the first FPGA module 102 and the second FPGA module 202 processing data.

[0087] The clock signal generated by the clock module 304 has stable frequency and phase, which is crucial for ensuring that data moves correctly and synchronously between various parts of the FPGA module. In the first FPGA module 102, the clock signal is used to control the channel coding and modulation process, ensuring that new service data can be processed and converted according to the predetermined timing. In the second FPGA module 202, the clock signal is used to synchronize signal processing tasks in the combining process, including signal mixing, filtering, and amplitude control, etc.

[0088] The design of the clock module 304 requires high precision and stability, because any clock error or jitter can affect the quality of signal processing and the performance of the system. By providing a unified clock source to the two FPGA modules, the clock module 304 not only ensures the synchronization of the processing process, but also helps to reduce signal distortion and interference caused by clock deviation.

[0089] In addition, the clock module 304 may also have programmability, allowing system designers to adjust the clock frequency according to specific application requirements, thereby optimizing system performance. For example, when high-speed data streams need to be processed, the clock frequency can be increased to meet the processing speed requirements. In summary, the clock module 304 ensures the efficient and reliable operation of the entire FM broadcast new service circuit by providing stable and accurate clock signals to the FPGA modules.

[0090] In some embodiments, the clock module 304 is designed with the consideration of working with external synchronization devices. When there is an external reference source, the circuit design allows the use of this more precise external clock reference as a priority to ensure that the time reference of the entire system is synchronized with the external standard, thereby improving the time accuracy and stability of the system. The clock module 304 is able to lock with the external reference source, maintaining the consistency and reliability of the clock signal even in complex or changing environments.

[0091] In addition, the circuit design of this embodiment also includes the ability to receive external second pulse and time of day (TOD) signals. The second pulse signal provides a precise time reference, enabling the system to synchronize in seconds, while the TOD signal provides more detailed time information, including hours, minutes, and seconds. These signals are crucial for ensuring the time synchronization of the circuit with external devices, especially in applications that require high-precision timestamps or time coordination with other systems.

[0092] Through this design, the clock module 304 not only provides a stable internal clock signal, but also flexibly synchronizes with external time references, enabling the entire FM broadcasting system to be used in a wider range of application scenarios, including broadcast networks that require strict time synchronization. This synchronization capability is very important for ensuring the on-time broadcast of broadcast signals, maintaining the continuity of services, and working with other broadcast systems.

[0093] In some embodiments, the signal output module 310 includes one or more of a DAC conversion module 311, an up-conversion module 312, a signal amplification module 313, and a signal filtering module 314.

[0094] The DAC (Digital to Analog Converter) conversion module 311 is used to perform digital-to-analog conversion processing on the first combined signal or the second combined signal, obtaining an analog baseband signal. The up-conversion module 312 is used to perform up-conversion processing on the analog baseband signal, obtaining the first radio frequency transmission signal or the second radio frequency transmission signal.

[0095] Specifically, the DAC conversion module 311 first performs digital-to-analog conversion processing on the first combined signal or the second combined signal (these signals are in digital form and contain original FM content and new service data). This step is necessary because wireless transmission usually requires analog signals. The DAC module accurately converts digital samples back to their corresponding analog waveforms, restoring the continuity of the signal and generating an analog baseband signal.

[0096] Subsequently, the up-conversion module 312 takes over the analog baseband signals and performs up-conversion processing. Up-conversion is the process of converting the frequency range of a signal from a lower baseband frequency to a higher radio frequency range suitable for wireless transmission. This process usually involves the use of a mixer to combine the analog baseband signal with a high-frequency local oscillator signal to produce the desired radio frequency signal. The up-conversion module 312 ensures that the frequency of the signal is correctly raised and the quality of the signal is maintained, thereby generating a first radio frequency transmission signal or a second radio frequency transmission signal.

[0097] These radio frequency transmission signals can then be further amplified and filtered to meet the requirements of transmission power and frequency characteristics. Finally, these signals are radiated into the air through the transmission antenna for the receiver to receive. Through the joint work of the DAC conversion module 311 and the up-conversion module 312, the circuit can effectively convert the digital combined signal into a radio frequency transmission signal suitable for frequency modulation broadcast, ensuring the smooth transmission and reception of the signal.

[0098] In some embodiments, the signal amplification module 313 is connected with the up-conversion module 312 for amplifying the first radio frequency transmission signal or the second radio frequency transmission signal.

[0099] Among them, the signal amplification module 313 is directly connected with the up-conversion module 312, and undertakes the task of amplifying the first radio frequency transmission signal or the second radio frequency transmission signal generated by the up-conversion module 312. The radio frequency signal generated by the up-conversion module 312, although the frequency is suitable for wireless transmission, but often the power level is not enough to be directly used for transmission, so it needs the signal amplification module 313 to perform gain enhancement. The signal amplification module 313 ensures that the signal reaches a sufficient power level through a high-power amplifier to cover the predetermined broadcast area and ensure the transmission quality of the signal. The amplification process not only enhances the transmission distance of the signal, but also helps to improve the penetration and anti-interference ability of the signal, ensuring that the signal can be stably received in various environments.

[0100] In some embodiments, the signal filtering module 314 is connected with the signal amplification module 313 for filtering the amplified first radio frequency transmission signal or the second radio frequency transmission signal.

[0101] Among them, the signal filtering module 314 is followed by the signal amplification module 313, and its role is to filter the amplified radio frequency transmission signal. Because the amplification process may introduce additional noise and non-desired frequency components, the signal filtering module 314 removes the spurious frequencies and harmonics in the signal through a precisely designed filter, while retaining the main signal components. This step is crucial to improve the purity and transmission quality of the signal, as it ensures the stability and reliability of the signal during transmission. The filtered signal has better signal-to-noise ratio and selectivity, thus ensuring the sound quality of the receiving end and the accuracy of data transmission. Through the processing of the signal filtering module 314, the final radio frequency transmission signal provides a solid foundation for high-quality wireless broadcasting.

[0102] The embodiment provides a circuit for adding new services to frequency modulation broadcasting, which aims to add new services in the existing frequency modulation broadcasting frequency band, while avoiding additional occupation of frequency resources, effectively solving the problem of tight frequency resources. The circuit realizes seamless integration and efficient transmission of new service data and existing frequency modulation broadcasting signals through a series of carefully designed modules.

[0103] Firstly, the circuit obtains new service data through the interface module 101, which may include text, images, audio or video and other multimedia content. The interface module 101 supports multiple data input methods such as network port, serial port, etc., ensuring the flexibility and convenience of data input.

[0104] The obtained new service data is then transmitted to the first FPGA module 102. The first FPGA module 102 performs channel coding and modulation processing according to the characteristics of the new service data and the channel conditions. This step is the key to ensure that the data can be reliably transmitted in the wireless channel. The coded and modulated signals are called new service modulation data, which are ready to be embedded into the existing frequency modulation broadcasting signal.

[0105] The first ADC module 201 is responsible for obtaining and converting the original radio frequency signal, converting the analog signal into a digital signal, and providing a basis for subsequent digital signal processing. The second FPGA module 202 is the core of the circuit, which combines the new service modulation data with the original radio frequency digital signal to generate a combined signal containing new and old content. This process requires precise digital signal processing technology to ensure that the new and old signals can coexist harmoniously in the same frequency bandwidth and avoid mutual interference.

[0106] The combined signal is transmitted to the signal output module 310, which first converts the digital combined signal into an analog signal through the DAC conversion module 311. Then, the analog baseband signal is up-converted to a radio frequency range suitable for wireless transmission by the up-conversion module 312. In order to ensure the quality of the signal, the signal amplification module 313 amplifies the up-converted signal to a sufficient power level. Finally, the signal filtering module 314 filters the amplified signal to remove unwanted frequency components and noise, ensuring the purity and stability of the signal.

[0107] In some designs, the circuit also includes a second ADC module 203 for collecting external new service radio frequency signals and converting them into digital signals. This provides additional flexibility for the circuit, allowing integration of external signals. In addition, the introduction of the third ADC module 204 and the DPD processing module 205 enables the circuit to perform pre-distortion processing on the signal after the power amplifier, compensating for the nonlinear distortion introduced by the power amplifier, further improving the transmission quality of the signal.

[0108] In order to improve the flexibility and reliability of signal processing, the circuit also includes a coupler 301 and a coaxial switch 302. The coupler 301 is used to separate the original FM signal to generate component signals for signal processing. The coaxial switch 302 is used to switch between different signal paths, such as selecting the output between the original signal and the combined signal, ensuring the flexibility of signal routing.

[0109] The introduction of the circulator 303 further improves the unidirectionality and isolation of signal transmission, preventing signal reflection and interference. The clock module 304 provides a unified clock signal for the entire circuit, ensuring synchronized operation between modules. In particular, the clock module 304 can be locked with an external reference source, improving the clock accuracy and stability of the circuit.

[0110] In summary, the present embodiment realizes efficient integration and transmission of new service data within the existing FM broadcast frequency band. The system not only improves the utilization efficiency of frequency resources, but also ensures the quality and stability of the new service signal through accurate signal processing and conversion processes. In addition, the flexibility and scalability of the system enable it to adapt to future technological developments and changes in business needs, providing an innovative solution for the FM broadcast field.

[0111] The above describes only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope of the claims.

Claims

1. A circuit for frequency modulation broadcast new service, characterized by, The application relates to a signal processing device for a frequency modulation (FM) radio station. The device comprises an interface module for acquiring new service data; a first FPGA module connected with the interface module and used for performing channel coding and modulation processing on the new service data according to channel characteristics of the new service data to obtain new service modulation data; a first ADC module for acquiring an original radio frequency signal and performing analog-digital conversion processing on the original radio frequency signal to obtain an original radio frequency digital signal; a second FPGA module connected with the first ADC module and the first FPGA module and used for adding the new service modulation data to one side or both sides of a frequency modulation signal channel corresponding to the original radio frequency digital signal to obtain a first combined signal; and a signal output module connected with the second FPGA module and used for converting the first combined signal into a first radio frequency transmitting signal for output. The device further comprises a second ADC module for collecting new service radio frequency signals from the outside and performing analog-digital conversion processing on the new service radio frequency signals to obtain new service radio frequency digital signals; the second FPGA module is further connected with the second ADC module and used for adding the new service radio frequency digital signals to one side or both sides of the frequency modulation signal channel to obtain a second combined signal; and the signal output module is further used for converting the second combined signal into a second radio frequency transmitting signal for output. The device further comprises a third ADC module for collecting power amplifier feedback signals corresponding to the first combined signal or the second combined signal and a DPD processing module for performing pre-distortion processing on the first combined signal or the second combined signal according to the power amplifier feedback signals. The device further comprises a coupler for receiving an original FM signal, performing coupling processing on the original FM signal to obtain a first component signal, and transmitting the first component signal to the first ADC module as the original radio frequency signal. The coupler is further used for performing coupling processing on the original FM signal to obtain a second component signal; a coaxial switch is connected with the signal output module and the coupler and used for switching output between the second component signal and the first radio frequency transmitting signal or between the second component signal and the second radio frequency transmitting signal.

2. The circuit of claim 1, wherein, The device further comprises a circulator connected between the coupler and the coaxial switch.

3. The circuit of claim 2, wherein, The signal output module comprises a DAC conversion module and an up-conversion module; the DAC conversion module is used for performing digital-analog conversion processing on the first combined signal or the second combined signal to obtain an analog baseband signal; and the up-conversion module is used for performing up-conversion processing on the analog baseband signal to obtain the first radio frequency transmitting signal or the second radio frequency transmitting signal.

4. The circuit of claim 1 or 2, wherein The signal output module further comprises a signal amplification module connected with the up-conversion module and used for performing amplification processing on the first radio frequency transmitting signal or the second radio frequency transmitting signal.

5. The circuit of claim 4, wherein, ​ 6. The circuit of claim 5, wherein, ​ 7. The circuit of claim 1 or 2, wherein ​ 8. The circuit of claim 7, wherein, ​ 9. The circuit of claim 8, wherein, The signal output module further comprises a signal filtering module connected with the signal amplification module, configured to filter the amplified first radio frequency transmission signal or the second radio frequency transmission signal.

10. The circuit of claim 1, wherein, Further comprising a clock module configured to provide a clock signal to the first FPGA module and the second FPGA module.

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