A method and system for generating an FSK signal with an envelope structure

Abstract

The application discloses a FSK signal generation method and system with envelope structure. The method comprises the following steps: generating an amplitude modulation signal with envelope structure; generating a FSK frequency modulation signal; and generating a FSK signal with envelope structure by using the amplitude modulation signal with envelope structure and the FSK frequency modulation signal. The application generates the amplitude modulation signal with envelope structure and the FSK frequency modulation signal respectively, and then generates the FSK signal with envelope structure by using the amplitude modulation signal with envelope structure and the FSK frequency modulation signal. The FSK signal with envelope structure to be generated is divided into the amplitude modulation signal with envelope structure and the FSK frequency modulation signal, the two signals are generated respectively and then synthesized, so that the number of data point information required for generating the FSK signal with complete envelope structure can be effectively reduced, and the waveform loading time of an arbitrary waveform generator can be reduced.

Description

Technical Field

[0001] This application relates to the field of electronic information technology, and in particular to a method and system for generating FSK signals with an envelope structure. Background Technology

[0002] FSK (Frequency Shift Keying) is a signal modulation method. The envelope structure refers to the characteristic of the uplink signal transmitted from a transponder installed in the middle of the railway track to the transponder's onboard antenna installed at the bottom of the train's engine during vehicle-to-ground communication; this characteristic of first becoming stronger and then weaker is the envelope structure.

[0003] During train operation, for example, when the train is traveling at a speed of 10 km / h, the envelope duration is approximately 0.9 seconds. The carrier frequency of the uplink signal, i.e., the FSK signal with an envelope structure, is 4.23 MHz ± 564.48 kHz. Outputting a complete FSK signal with an envelope structure at twice the sampling rate of the FSK center frequency of 4.23 MHz would require approximately 7 million data points. For most arbitrary waveform generators, this amount of data far exceeds their maximum load capacity. Even the best-performing arbitrary waveform generators struggle to load such a large amount of waveform data within a few seconds. Therefore, based on the Nyquist sampling theorem, assuming the carrier signal sampling rate is met, the data volume corresponding to a complete FSK signal with an envelope structure is extremely large. This results in a long waveform loading time for arbitrary waveform generators, and under some extreme conditions, the memory of the arbitrary waveform generator may not even be able to handle the massive amount of data.

[0004] Therefore, how to reduce the number of data points required to generate an FSK signal with a complete envelope structure, thereby reducing the waveform loading time of arbitrary waveform generators, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a method and system for generating FSK signals with envelope structures, thereby reducing the number of data points required to generate FSK signals with complete envelope structures, and thus reducing the waveform loading time of arbitrary waveform generators.

[0006] The embodiments of this application disclose the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a method for generating an FSK signal with an envelope structure, the method comprising:

[0008] Generate an amplitude-modulated signal with an envelope structure;

[0009] Generate an FSK frequency modulation signal;

[0010] An FSK signal with an envelope structure is generated using the amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal.

[0011] Optionally, generating an amplitude-modulated signal with an envelope structure includes:

[0012] Determine the current speed level;

[0013] Based on the current speed level, obtain waveform data of the amplitude-modulated signal containing the envelope structure;

[0014] An amplitude-modulated signal with an envelope structure is generated using the waveform data of the amplitude-modulated signal with the envelope structure.

[0015] Optionally, generating the FSK frequency modulation signal includes:

[0016] Generate baseband signal;

[0017] Generate waveform data for the FSK frequency modulation signal;

[0018] The waveform data of the FSK frequency modulation signal is modulated using the baseband signal;

[0019] The FSK frequency modulation signal is generated based on the waveform data of the modulated FSK frequency modulation signal.

[0020] Optionally, generating the baseband signal includes:

[0021] Generate waveform data for the baseband signal;

[0022] The baseband signal is generated using the waveform data of the baseband signal.

[0023] Optionally, generating an FSK signal with an envelope structure using the amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal includes:

[0024] The amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal are multiplied and synthesized to obtain the FSK signal with the envelope structure.

[0025] Secondly, embodiments of this application provide an FSK signal generation system with an envelope structure, the system comprising:

[0026] Controller, frequency modulation signal generator, amplitude modulation signal generator, and analog multiplier;

[0027] The controller is used to trigger the frequency modulation signal generator and the amplitude modulation signal generator;

[0028] The frequency modulation signal generator is used to generate FSK frequency modulation signals;

[0029] The amplitude modulation signal generator is used to generate an amplitude modulation signal with an envelope structure;

[0030] The multiplier is used to generate an FSK signal with an envelope structure using the amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal with the FSK.

[0031] Optionally, the system further includes:

[0032] Speed ​​level determiner, used to determine the current speed level;

[0033] The controller is further configured to generate waveform data of an amplitude-modulated signal containing an envelope structure based on the current speed level.

[0034] The amplitude modulation signal generator is also used to generate an amplitude modulation signal with an envelope structure using the waveform data of the amplitude modulation signal with the envelope structure.

[0035] Optionally, the system further includes:

[0036] Baseband signal generator, used to generate baseband signals;

[0037] The controller is also used to generate waveform data of the FSK frequency modulation signal and to trigger the baseband signal generator;

[0038] The frequency modulation signal generator is also used to modulate the waveform data of the FSK frequency modulation signal using the baseband signal, and generate an FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal.

[0039] Optionally, the controller is also configured to generate waveform data of the baseband signal;

[0040] The baseband signal generator is also used to generate a baseband signal using the waveform data of the baseband signal.

[0041] Optionally, the analog multiplier is further used to multiply and synthesize the amplitude-modulated signal with envelope structure and the frequency-modulated FSK signal to obtain an FSK signal with envelope structure.

[0042] Compared with the prior art, this application has the following beneficial effects:

[0043] This application generates an amplitude-modulated (AM) signal and an FSK frequency-modulated (FM) signal with envelope structures separately, and then uses the AM and FM signals to generate an FSK signal with envelope structures. By splitting the required FSK signal with envelope structures into AM and FM signals, generating these two signals separately, and then combining them, the number of data points required to generate a complete FSK signal with envelope structures can be effectively reduced, thereby reducing the waveform loading time of the arbitrary waveform generator. For example, when a train travels at 10 km / h, its envelope duration is approximately 0.936 s, corresponding to a distance of about 2.6 m. If we estimate the data volume of a single communication at twice the center frequency of 4.2 MHz (8.4 MHz), it would be approximately 7.86 M data points. However, splitting it into an FSK FM signal and an AM signal with envelope structures significantly reduces the data volume. The FSK frequency modulation signal, with an 8.4MHz sampling rate, a 1023-bit single-frame message, and a data rate of 564.48kbit / s cyclically per frame, requires approximately 15.2k data points. If an external modulation method is used, only 1023 data points are needed. The amplitude modulation signal with an envelope structure, sampled at 0.1m intervals and interpolated at a 10:1 ratio, requires only 261 data points. This reduces the number of data points needed to generate a complete FSK signal with an envelope structure, thus reducing the waveform loading time of the arbitrary waveform generator. Furthermore, due to the relatively small data volume, the response time for changing waveform data during dynamic testing is significantly shortened, thus adapting to rapidly changing testing requirements. Simultaneously, the substantial data compression significantly reduces the memory performance requirements of the instrument, resulting in a substantial reduction in the overall cost of the solution. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic flowchart of an FSK signal generation method with an envelope structure provided in this application embodiment;

[0046] Figure 2 This is a schematic flowchart of an FSK frequency modulation signal generation method provided in an embodiment of this application;

[0047] Figure 3 A schematic diagram of an FSK signal generation system with an envelope structure is provided in this application embodiment;

[0048] Figure 4 A schematic diagram of another FSK signal generation system with an envelope structure provided in this application embodiment;

[0049] Figure 5 This is a schematic diagram of the baseband signal generator waveform provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the waveform of the frequency modulation signal generator provided in the embodiments of this application;

[0051] Figure 7 This is a schematic diagram of the waveform of the amplitude modulation signal generator provided in the embodiments of this application;

[0052] Figure 8 This is a schematic diagram of the waveform of an analog multiplier provided in an embodiment of this application. Detailed Implementation

[0053] As described above, the number of data points required to generate a complete FSK signal with an envelope structure is currently large, resulting in a long waveform loading time for arbitrary waveform generators.

[0054] Through research, the inventors have developed a method and system for generating FSK signals with an envelope structure, which reduces the number of data points required to generate an FSK signal with a complete envelope structure, thereby reducing the waveform loading time of arbitrary waveform generators.

[0055] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0056] Method Implementation Examples

[0057] See Figure 1 The figure is a schematic flowchart of an FSK signal generation method with an envelope structure provided in an embodiment of this application, including the following steps:

[0058] S101 generates an amplitude-modulated signal with an envelope structure.

[0059] It should be noted that amplitude modulation (AM) is a modulation method used in electronic communications, commonly used for radio carrier transmission. In amplitude modulation, the amplitude of the carrier wave, or signal strength, varies proportionally to the transmitted wave. For example, this waveform might correspond to the sound reproduced by a loudspeaker or the light intensity of a television pixel. This method contrasts with frequency modulation, which involves changes in carrier frequency, and phase modulation, which involves changes in phase.

[0060] Specifically, in the embodiments provided in this application, the current speed level can be determined using a speed level determiner. Based on the current speed level, the waveform data of the amplitude-modulated signal with an envelope structure is acquired using a controller. This waveform data is then loaded into an amplitude modulation signal generator. The controller triggers the amplitude modulation signal generator, enabling it to generate an amplitude-modulated signal with an envelope structure using the waveform data. The waveform of the generated amplitude-modulated signal with an envelope structure is as follows: Figure 7 As shown, Figure 7 This is a waveform diagram of an amplitude modulation signal generator provided in an embodiment of this application. The amplitude modulation signal generator is an arbitrary waveform generator, which can load arbitrary waveforms through a control interface and generally also has a signal modulation interface and an external trigger interface.

[0061] In the embodiments provided in this application, after initializing the instruments required to generate the FSK signal with an envelope structure, the current speed level can be determined. If the current speed level is not the highest speed level, waveform data of the amplitude modulation signal with an envelope structure can be generated based on the current speed level and loaded into the amplitude modulation signal generator. After loading, the amplitude modulation signal generator is triggered to output the amplitude modulation signal with an envelope structure. The number of triggers is counted. If the number of triggers does not reach the preset number, the amplitude modulation signal generator is repeatedly triggered to output the amplitude modulation signal with an envelope structure.

[0062] S102 generates an FSK frequency modulation signal.

[0063] It should be noted that FSK (Frequency Shift Keying) is a signal modulation method. It uses a multiplier to modulate a low-frequency digital / baseband signal and a high-frequency sinusoidal signal into a sinusoidal signal with alternating frequencies in the time domain, facilitating propagation in free space or through media such as transmission cables. This modulation method is used in signal transmission in track circuits and transponder systems commonly used in rail transit.

[0064] S103, using the amplitude modulation signal with envelope structure and the frequency modulation signal with FSK structure to generate an FSK signal with envelope structure.

[0065] Specifically, in the embodiments provided in this application, an analog multiplier can be used to multiply and synthesize the amplitude-modulated signal with an envelope structure and the frequency-modulated FSK signal to obtain an FSK signal with an envelope structure. An analog multiplier is an active nonlinear device that performs the multiplication function of two analog signals. The waveform of the obtained FSK signal with an envelope structure is as follows: Figure 8 As shown, Figure 8 This is a schematic diagram of the waveform of an analog multiplier provided in an embodiment of this application.

[0066] It should be noted that, in the embodiments provided in this application, the generated FSK signal with an envelope structure can be used as an uplink signal emitted by the transponder. During train operation, vehicle-to-ground communication is required, which is the process of wireless communication and information exchange between the train and signaling equipment fixed on the ground. In this process, both the onboard signaling equipment and the ground signaling equipment possess signal transmission and signal structure functions, typically near-field inductive antennas. Specifically, the transponder's onboard antenna mounted at the train's head transmits a high-energy 27MHz downlink excitation radio frequency signal to the transponder installed between the two tracks. After receiving this signal, the transponder converts it into operating power to activate it, and then transmits a 4MHz uplink signal in FSK form to the transponder's onboard antenna through its operating circuit and 4MHz transmitting antenna. This is the FSK signal with an envelope structure generated by the method and system provided in this application.

[0067] The FSK signal generation method with an envelope structure provided in this application generates an amplitude-modulated (AM) signal and an FSK frequency-modulated (FM) signal with an envelope structure respectively, and then uses the AM signal and the FM signal to generate an FSK signal with an envelope structure. By splitting the required FSK signal with an envelope structure into an AM signal and an FM signal, generating these two signals separately, and then combining them, the number of data points required to generate a complete FSK signal with an envelope structure can be effectively reduced, thereby reducing the waveform loading time of the arbitrary waveform generator. For example, when a train travels at 10 km / h, its envelope duration is approximately 0.936 s, corresponding to a distance of about 2.6 m. If the data volume of a single communication is estimated at 8.4 MHz (twice the center frequency of the 4.2 MHz carrier), it would be approximately 7.86 M data points. However, splitting it into an FSK FM signal and an AM signal with an envelope structure significantly reduces the data volume. The FSK frequency modulation signal, with an 8.4MHz sampling rate, a 1023-bit single-frame message, and a data rate of 564.48kbit / s cyclically per frame, requires approximately 15.2k data points. If an external modulation method is used, only 1023 data points are needed. The amplitude modulation signal with an envelope structure, sampled at 0.1m intervals and interpolated at a 10:1 ratio, requires only 261 data points. This reduces the number of data points needed to generate a complete FSK signal with an envelope structure, thus reducing the waveform loading time of the arbitrary waveform generator. Furthermore, due to the relatively small data volume, the response time for changing waveform data during dynamic testing is significantly shortened, thus adapting to rapidly changing testing requirements. Simultaneously, the substantial data compression significantly reduces the memory performance requirements of the instrument, resulting in a substantial reduction in the overall cost of the solution.

[0068] See Figure 2 The figure is a schematic flowchart of an FSK frequency modulation signal generation method provided in an embodiment of this application, including the following steps:

[0069] S201 generates waveform data for the baseband signal.

[0070] It should be noted that baseband signal refers to the original electrical signal that has not been modulated, that is, has not undergone spectrum shifting and transformation. Its characteristics are low frequency, signal spectrum starting from near zero frequency, and low-pass form.

[0071] Specifically, in the embodiments provided in this application, a controller can be used to generate waveform data of the baseband signal. After generating the waveform data of the baseband signal, the waveform data of the baseband signal can be loaded into a baseband signal generator to facilitate the implementation of subsequent steps. The baseband signal generator is an arbitrary waveform generator.

[0072] S202, using the waveform data of the baseband signal to generate a baseband signal.

[0073] Specifically, after the baseband signal waveform data is successfully loaded into the baseband signal generator, the controller triggers the baseband signal generator, enabling it to generate a baseband signal using the baseband signal waveform data. The generated baseband signal waveform is as follows: Figure 5 As shown, Figure 5 This is a schematic diagram of the waveform of the baseband signal generator provided in an embodiment of this application.

[0074] S203 generates waveform data for the FSK frequency modulation signal.

[0075] Specifically, in the embodiments provided in this application, waveform data of an FSK frequency modulation signal can be generated using a controller. After generating the waveform data of the FSK frequency modulation signal, the FSK frequency modulation signal can be loaded into a frequency modulation signal generator to facilitate subsequent steps. The frequency modulation signal generator is an arbitrary waveform generator.

[0076] S204, The waveform data of the FSK frequency modulation signal is modulated using the baseband signal.

[0077] Specifically, in the embodiments provided in this application, the baseband signal generated in step S202 can be loaded into the frequency modulation signal generator through the modulation interface of the frequency modulation signal generator. Since the waveform data of the FSK frequency modulation signal is also loaded into the frequency modulation signal generator in step S203, the current frequency modulation signal generator contains waveform data of both the baseband signal and the FSK frequency modulation signal. Therefore, after the controller triggers the frequency modulation signal generator, the frequency modulation signal generator can be used to modulate the waveform data of the FSK frequency modulation signal using the baseband signal to obtain the waveform data of the modulated FSK frequency modulation signal.

[0078] S205 generates an FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal.

[0079] Specifically, in the embodiments provided in this application, an FSK frequency modulation signal can be generated using a frequency modulation signal generator based on the waveform data of the modulated FSK frequency modulation signal. The waveform of the generated FSK frequency modulation signal is as follows: Figure 6 As shown, Figure 6 This is a waveform diagram of a frequency modulation signal generator provided in an embodiment of this application.

[0080] The embodiments provided in this application generate waveform data of a baseband signal; generate a baseband signal using the waveform data of the baseband signal; generate waveform data of an FSK frequency modulation signal; modulate the waveform data of the FSK frequency modulation signal using the baseband signal; and generate an FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal. Modulating the waveform data of the FSK frequency modulation signal using the baseband signal and generating the FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal makes the generated FSK frequency modulation signal clearer, thereby making the synthesized FSK signal with an envelope structure based on the clearer FSK frequency modulation signal also clearer.

[0081] System Implementation Examples

[0082] See Figure 3 The figure is a schematic diagram of an FSK signal generation device with an envelope structure provided in an embodiment of this application, including: a controller 301, a frequency modulation signal generator 302, an amplitude modulation signal generator 303, and an analog multiplier 304.

[0083] The controller 301 is used to trigger the frequency modulation signal generator and the amplitude modulation signal generator;

[0084] The frequency modulation signal generator 302 is used to generate FSK frequency modulation signals;

[0085] The amplitude modulation signal generator 303 is used to generate an amplitude modulation signal containing an envelope structure;

[0086] The multiplier 304 is used to generate an FSK signal with an envelope structure using the amplitude-modulated signal with an envelope structure and the frequency-modulated FSK signal with an envelope structure.

[0087] See Figure 4 The figure is a schematic diagram of another FSK signal generation system with an envelope structure provided in this application embodiment, including: a controller 401, a baseband signal generator 402, a frequency modulation signal generator 403, an amplitude modulation signal generator 404, and an analog multiplier 405.

[0088] It should be noted that, in the embodiments provided in this application, there are also those not in Figure 4 The speed level determiner shown in the image is used to determine the current speed level.

[0089] The controller 401 is used to generate waveform data of baseband signals, generate waveform data of amplitude modulation signals with envelope structure according to the current speed level, generate waveform data of FSK frequency modulation signals, and trigger the baseband signal generator 402, frequency modulation signal generator 403 and amplitude modulation signal generator 404.

[0090] The baseband signal generator 402 is used to generate a baseband signal using the waveform data of the baseband signal;

[0091] The frequency modulation signal generator 403 is used to modulate the waveform data of the FSK frequency modulation signal using the baseband signal, and generate the FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal.

[0092] The amplitude modulation signal generator 404 is used to generate an amplitude modulation signal with an envelope structure using waveform data of the amplitude modulation signal with an envelope structure.

[0093] The analog multiplier 405 is used to multiply and synthesize the amplitude-modulated signal with envelope structure and the frequency-modulated FSK signal to obtain the FSK signal with envelope structure.

[0094] Utilize Figure 4 The process of generating an FSK signal with an envelope structure in the system shown is as follows:

[0095] Determine the current speed level;

[0096] Based on the current speed level, the controller 401 calculates the waveform data of the amplitude modulation signal containing the envelope structure;

[0097] The waveform data of the amplitude-modulated signal containing the envelope structure is loaded into the amplitude-modulated signal generator 404;

[0098] The controller 401 triggers the amplitude modulation signal generator 404, causing the amplitude modulation signal generator 404 to generate an amplitude modulation signal with an envelope structure based on the waveform data of the amplitude modulation signal with an envelope structure.

[0099] The controller 401 is used to generate waveform data of the baseband signal;

[0100] The waveform data of the baseband signal is loaded into the baseband signal generator 402;

[0101] The controller 401 triggers the baseband signal generator 402, causing the baseband signal generator 402 to generate a baseband signal based on the waveform data of the baseband signal;

[0102] The controller 401 is used to generate waveform data of the FSK frequency modulation signal;

[0103] The waveform data of the FSK frequency modulation signal is loaded into the frequency modulation signal generator 403;

[0104] The waveform data of the FSK frequency modulation signal is modulated by the frequency modulation signal generator 403 according to the baseband signal;

[0105] The controller 401 triggers the frequency modulation signal generator 403, causing the frequency modulation signal generator 403 to generate an FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal;

[0106] The amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal are transmitted to the analog multiplier 405;

[0107] The amplitude-modulated signal with envelope structure and the frequency-modulated FSK signal are multiplied and synthesized using an analog multiplier 405 to generate an FSK signal with envelope structure.

[0108] The FSK signal generation system with an envelope structure provided in this application generates an amplitude-modulated (AM) signal and an FSK frequency-modulated (FM) signal with an envelope structure using an AM signal generator and an FM signal generator, respectively. Then, an analog multiplier is used to synthesize the AM signal with an envelope structure and the FM signal into an FSK signal with an envelope structure. By splitting the required FSK signal with an envelope structure into an AM signal with an envelope structure and an FM signal, generating these two signals separately, and then synthesizing them, the number of data points required to generate a complete FSK signal with an envelope structure can be effectively reduced, thereby reducing the waveform loading time of the arbitrary waveform generator. For example, when a train travels at 10 km / h, its envelope duration is approximately 0.936 s, corresponding to a distance of about 2.6 m. If the data volume of a single communication is estimated at 8.4 MHz (twice the center frequency of the 4.2 MHz carrier), it would be approximately 7.86 M data points. However, splitting it into an FSK frequency-modulated signal and an AM signal with an envelope structure significantly reduces the data volume. The FSK frequency modulation signal, with an 8.4MHz sampling rate, a 1023-bit single-frame message, and a data rate of 564.48kbit / s cyclically per frame, requires approximately 15.2k data points. If an external modulation method is used, only 1023 data points are needed. The amplitude modulation signal with an envelope structure, sampled at 0.1m intervals and interpolated at a 10:1 ratio, requires only 261 data points. This reduces the number of data points needed to generate a complete FSK signal with an envelope structure, thus reducing the waveform loading time of the arbitrary waveform generator. Furthermore, due to the relatively small data volume, the response time for changing waveform data during dynamic testing is significantly shortened, thus adapting to rapidly changing testing requirements. Simultaneously, the substantial data compression significantly reduces the memory performance requirements of the instrument, resulting in a substantial reduction in the overall cost of the solution.

[0109] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The system embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0110] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for generating FSK signals with an envelope structure, characterized in that, The method includes: Generate an amplitude-modulated signal with an envelope structure; Generate an FSK frequency modulation signal; Generating an FSK signal with an envelope structure using the amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal includes: The amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal are multiplied and synthesized to obtain the FSK signal with the envelope structure.

2. The method according to claim 1, characterized in that, The generation of the amplitude-modulated signal with an envelope structure includes: Determine the current speed level; Based on the current speed level, obtain waveform data of the amplitude-modulated signal containing the envelope structure; An amplitude-modulated signal with an envelope structure is generated using the waveform data of the amplitude-modulated signal with the envelope structure.

3. The method according to claim 1, characterized in that, The generation of the FSK frequency modulation signal includes: Generate baseband signal; Generate waveform data for the FSK frequency modulation signal; The waveform data of the FSK frequency modulation signal is modulated using the baseband signal; The FSK frequency modulation signal is generated based on the waveform data of the modulated FSK frequency modulation signal.

4. The method according to claim 3, characterized in that, The generation of the baseband signal includes: Generate waveform data for the baseband signal; The baseband signal is generated using the waveform data of the baseband signal.

5. An FSK signal generation system with an envelope structure, characterized in that, The system includes: Controller, frequency modulation signal generator, amplitude modulation signal generator, and analog multiplier; The controller is used to trigger the frequency modulation signal generator and the amplitude modulation signal generator; The frequency modulation signal generator is used to generate FSK frequency modulation signals; The amplitude modulation signal generator is used to generate an amplitude modulation signal with an envelope structure; The multiplier is used to generate an FSK signal with an envelope structure using the amplitude-modulated signal with the envelope structure and the frequency-modulated FSK signal with the FSK signal. The analog multiplier is also used to multiply and synthesize the amplitude-modulated signal with envelope structure and the frequency-modulated FSK signal to obtain an FSK signal with envelope structure.

6. The system according to claim 5, characterized in that, The system also includes: Speed ​​level determiner, used to determine the current speed level; The controller is further configured to generate waveform data of an amplitude-modulated signal containing an envelope structure based on the current speed level. The amplitude modulation signal generator is also used to generate an amplitude modulation signal with an envelope structure using the waveform data of the amplitude modulation signal with the envelope structure.

7. The system according to claim 5, characterized in that, The system also includes: Baseband signal generator, used to generate baseband signals; The controller is also used to generate waveform data of the FSK frequency modulation signal and to trigger the baseband signal generator; The frequency modulation signal generator is also used to modulate the waveform data of the FSK frequency modulation signal using the baseband signal, and generate an FSK frequency modulation signal based on the waveform data of the modulated FSK frequency modulation signal.

8. The system according to claim 7, characterized in that, The controller is also used to generate waveform data for the baseband signal; The baseband signal generator is also used to generate a baseband signal using the waveform data of the baseband signal.

Images