Signal processing method and signal processing device

Abstract

A signal processing method and a signal processing device, wherein the signal processing method comprises: generating a first modulation signal based on an input control function; modulating a signal to be processed with the first modulation signal within 0 to T / 4 of each modulation cycle, wherein T is the modulation cycle; modulating the signal to be processed with a second modulation signal within T / 4 to T / 2 of each modulation cycle, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal within the same modulation cycle are symmetrical about the center; modulating the signal to be processed with a third modulation signal within T / 2 to T of each modulation cycle, wherein a curve corresponding to the third modulation signal within the same modulation cycle and a curve corresponding to the modulation signal used in the first half of the modulation cycle are symmetrical about the central axis. The technical solution provided by the present application can more reliably reduce the EIM of the system.

Description

Technical Field

[0001] The present application relates to the field of signal processing technology, and in particular to a signal processing method and a signal processing device. Background Art

[0002] The signals and clock signals generated by the switching power supply are the main sources of electromagnetic interference (EMI) for many digital electronic devices. These EMI must be suppressed to avoid interfering with other electronic devices and meet the relevant regulations of the Federal Communications Commission (FCC) of the United States.

[0003] Traditional methods of reducing EMI include the use of "passive" devices such as metal shields, chokes, ferrite beads, resistors and capacitors. The recent trend is to use "active" methods to distribute the peak energy concentrated in a narrow band over a wider frequency band. This technology is usually called the spread spectrum method.

[0004] At present, the spread spectrum method is mainly based on a phase-locked loop to build a feedback loop for frequency modulation. This spread spectrum method requires the use of multiple components such as counters, voltage or current controlled oscillators, phase comparators and filters to form a feedback loop (as shown in Figure 1, a schematic diagram of the device structure for reducing EMI based on a phase-locked loop). When any component of the feedback loop fails, it will cause a catastrophic failure. In addition, the jitter from the phase-locked loop is also likely to cause a large frequency offset, and the system reliability is poor. Summary of the invention

[0005] The present application provides a signal processing method and a signal processing device, which can more reliably reduce the EIM of the system.

[0006] The first aspect of the present application provides a signal processing method, comprising:

[0007] generating a first modulation signal based on an input control function;

[0008] In each modulation period from 0 to T / 4, the signal to be processed is modulated by the first modulation signal, wherein T is the modulation period;

[0009] In each modulation period T / 4 to T / 2, the signal to be processed is modulated with a second modulation signal, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal in the same modulation period are symmetrical about a center;

[0010] In each modulation period from T / 2 to T, the signal to be processed is modulated with a third modulation signal, wherein a curve corresponding to the third modulation signal in the same modulation period is symmetrical about the central axis with a curve corresponding to the modulation signal used in the first half of the modulation period.

[0011] Based on the first aspect of the present application, in a first possible implementation manner, before the input-based control function generates the first modulation signal, the method further includes:

[0012] Determine the values ​​of relevant parameters within the function model;

[0013] generating the control function based on the values ​​of relevant parameters in the function model;

[0014] Wherein, the function model is: t represents time, and the relevant parameters in the function model include: m, and a1 to a m .

[0015] Based on the first aspect of the present application or the first possible implementation of the first aspect, in a second possible implementation, the first modulation signal is generated based on the input control function: in each modulation period, the first modulation signal is generated based on the input control function.

[0016] Based on the first aspect of the present application or the first possible implementation of the first aspect, in a third possible implementation, modulating the signal to be processed with the first modulation signal includes: frequency modulating the signal to be processed with the first modulation signal;

[0017] The modulating the signal to be processed with the second modulation signal comprises: frequency modulating the signal to be processed with the second modulation signal;

[0018] The modulating the signal to be processed by using the third modulation signal includes: frequency modulating the signal to be processed by using the third modulation signal.

[0019] Based on the first aspect of the present application or the first possible implementation of the first aspect, in a fourth possible implementation, modulating the signal to be processed with the first modulation signal includes: performing phase modulation on the signal to be processed with the first modulation signal;

[0020] The modulating the signal to be processed with the second modulation signal comprises: performing phase modulation on the signal to be processed with the second modulation signal;

[0021] The modulating the signal to be processed with the third modulation signal includes: performing phase modulation on the signal to be processed with the third modulation signal.

[0022] A second aspect of the present application provides a signal processing device, including:

[0023] A modulation signal generating unit, configured to generate a first modulation signal based on an input control function;

[0024] A first modulation unit is used to modulate the signal to be processed with the first modulation signal within 0 to T / 4 of each modulation period, wherein T is the modulation period;

[0025] A second modulation unit is used to modulate the signal to be processed with a second modulation signal within T / 4 to T / 2 of each modulation period, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal within the same modulation period are symmetrical about the center;

[0026] The third modulation unit is used to modulate the signal to be processed with a third modulation signal within T / 2 to T of each modulation period, wherein a curve corresponding to the third modulation signal in the same modulation period is symmetrical about the central axis with a curve corresponding to the modulation signal used in the first half of the modulation period.

[0027] Based on the second aspect of the present application, in a first possible implementation manner, the signal processing device further includes:

[0028] A determination unit, used to determine the values ​​of relevant parameters in the function model;

[0029] A function generating unit, configured to generate the control function based on the values ​​of relevant parameters in the function model;

[0030] Wherein, the function model is: t represents time, and the relevant parameters in the function model include: m, and a1 to a m .

[0031] Based on the second aspect of the present application or the first possible implementation of the second aspect, in a second possible implementation, the modulation signal generating unit is specifically used to: generate a first modulation signal based on an input control function in each modulation period.

[0032] Based on the second aspect or the first possible implementation of the second aspect, in a third possible implementation, the modulation performed by the first modulation unit includes frequency modulation; the modulation performed by the second modulation unit includes frequency modulation; and the modulation performed by the third modulation unit includes frequency modulation.

[0033] Based on the second aspect or the first possible implementation of the second aspect, in a fourth possible implementation, the modulation performed by the first modulation unit includes phase modulation; the modulation performed by the second modulation unit includes phase modulation; and the modulation performed by the third modulation unit includes phase modulation.

[0034] As can be seen from the above, the present application solution does not use a feedback loop but generates a first modulation signal through a control function, and periodically modulates the signal to be processed with the first modulation signal, the second modulation signal, and the third modulation signal, so that the energy spectrum of the signal to be processed is expanded, thereby reducing the emission of EMI. Since the present application solution does not use a feedback loop, the number of system components can be effectively reduced, thereby increasing the overall reliability of the system, and further reducing the EIM of the system more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1-a A schematic diagram of a flow chart of an embodiment of a signal processing method provided by the present application;

[0036] Figure 1-b A schematic diagram of a curve corresponding to a first modulation signal in a scenario provided in the present application;

[0037] Figure 1-c A schematic diagram of a curve corresponding to a first modulation signal and a second modulation signal in a scenario provided in the present application;

[0038] Figure 1-d A schematic diagram of a curve corresponding to a third modulation signal in a scenario provided in the present application;

[0039] Figure 2-a A schematic diagram of a curve corresponding to a modulation signal in a scenario provided in this application;

[0040] Figure 2-b A schematic diagram of the spectrum response of a signal to be processed in a simulation scenario provided in this application;

[0041] Figure 2-c A schematic diagram of the spectrum response of a modulated signal in a simulation scenario provided by the present application;

[0042] Figure 2-d A schematic diagram of a curve corresponding to a modulation signal in another scenario provided by the present application;

[0043] Figure 2-e A schematic diagram of the spectrum response of a modulated signal in another simulation scenario provided by the present application;

[0044] Figure 3 A schematic diagram of the structure of an embodiment of a signal processing device provided by the present application;

[0045] Figure 4A schematic diagram of the structure of another embodiment of the signal processing device provided in the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0047] like Figure 1-a As shown, a signal processing method in an embodiment of the present application includes:

[0048] Step 101: Generate a first modulation signal based on an input control function;

[0049] In the embodiment of the present application, the control function is used to generate the first modulation signal, and the curve corresponding to the first modulation signal is also the curve corresponding to the control function. In practical applications, the control function can be pre-set so that the pre-set control function is called in step 101 to generate the first modulation signal.

[0050] Alternatively, in an application scenario, a function model is pre-constructed, and before executing step 101, the values ​​of relevant parameters in the function model are first determined, and the control function is generated based on the values ​​of relevant parameters in the function model, so that the first modulation signal is generated based on the control function in step 101. Specifically, the function model is Wherein, t represents time, and the relevant parameters in the above function model include: m, and a1 to a m That is, before step 101, first determine m, a1 to a m , then change m, a1 to a m Substitute the value of into the function model In the above control function, we can get: m In the scenario where the value is 1, the control function generated based on the function model In step 101, based on the control function Generate a corresponding first modulation signal, the curve of which can be shown as Figure 1-bAs shown. In this application scenario, the values ​​of the relevant parameters in the above-mentioned function model can be input manually. For example, the user can set the relevant parameters in the above-mentioned function model through the parameter setting interface provided by the signal processing device itself (the signal processing device is a device for executing the signal processing method of the present application) or a specific application installed on an external device (such as a computer, a mobile phone, a tablet computer, etc.) that is connected to the signal processing device; or, the values ​​of the relevant parameters in the above-mentioned function model can also be input automatically. For example, the relevant parameters in the above-mentioned function model can be automatically determined according to the change or instantaneous value of the voltage (or current) of the system where the switching power supply is located, and the control function is generated accordingly.

[0051] In an embodiment of the present application, a first modulation signal can be generated in each modulation cycle based on an input control function, that is, step 101 is executed in each modulation cycle. Alternatively, step 101 does not need to be executed in each modulation cycle, but only needs to be executed for the first time or when the control function is adjusted to update and store the first modulation signal (the first modulation information can be stored in a specific form), and the stored first modulation signal can be directly called in subsequent modulation cycles. There is no limitation here.

[0052] Step 102: modulate the signal to be processed with the first modulation signal within 0 to T / 4 of each modulation period;

[0053] In the embodiment of the present application, the above T is used to represent the modulation period. In step 102, in the first quarter of each modulation period, the signal to be processed (eg, a signal generated by a switching power supply, a clock signal, etc.) is modulated by the above first modulation signal.

[0054] Specifically, in the first quarter of each modulation cycle, the signal to be processed may be frequency modulated and / or phase modulated using the first modulation signal, so that the energy spectrum of the signal generated by the signal to be processed in the first quarter of the modulation cycle is expanded.

[0055] Step 103: modulate the signal to be processed with a second modulation signal within T / 4 to T / 2 of each modulation period;

[0056] In the embodiment of the present application, the curve corresponding to the second modulation signal in the same modulation period is symmetrical with the curve corresponding to the first modulation signal about the center, that is, the curve corresponding to the second modulation signal in the same modulation period and the curve corresponding to the first modulation signal have the following relationship:

[0057]

[0058] In step 103, based on the first modulation signal generated in step 101 and the above-mentioned characteristic of central symmetry, the above-mentioned second modulation signal can be obtained. Figure 1-b Taking the curve shown in FIG. 1 as an example, the curve corresponding to the second modulation signal can be as follows: Figure 1-c As shown, in Figure 1-c In the figure, the curve S1 marked with a “triangle” is a curve corresponding to the first modulation signal, and the curve S2 without a “triangle” mark is a curve corresponding to the second modulation signal.

[0059] Specifically, within T / 4 to T / 2 of each modulation period, the signal to be processed can be frequency modulated and / or phase modulated using the above-mentioned second modulation signal, so that the energy spectrum of the signal generated by the signal to be processed within T / 4 to T / 2 of the modulation period is expanded.

[0060] Step 104: modulate the signal to be processed with a third modulation signal within T / 2 to T of each modulation period;

[0061] In the embodiment of the present application, the curve corresponding to the third modulation signal in the same modulation period is symmetrical with the curve corresponding to the modulation signal used in the first half of the modulation period about the central axis. That is, the curve corresponding to the third modulation signal in the same modulation period and the curve corresponding to the modulation signal used in the first half of the modulation period have the following relationship:

[0062] In step 104, based on the first modulation signal, the second modulation signal and the above-mentioned symmetric characteristics about the central axis in the above-mentioned steps, the above-mentioned third modulation signal can be obtained. Figure 1-c Taking the curve shown in FIG. 1 as an example, the curve corresponding to the third modulation signal can be as follows: Figure 1-d shown.

[0063] Specifically, in the second half of each modulation cycle, the signal to be processed may be frequency modulated and / or phase modulated by the third modulation signal, so that the energy spectrum of the signal generated by the signal to be processed in the second half of the modulation cycle is expanded.

[0064] As can be seen from the above, the scheme in the embodiment of the present application does not use a feedback loop but generates a first modulation signal through a control function, and periodically modulates the signal to be processed with the first modulation signal, the second modulation signal and the third modulation signal, so that the energy spectrum of the signal to be processed is expanded, thereby reducing the emission of EMI. Since the scheme of the present application does not use a feedback loop, the number of system components can be effectively reduced, thereby increasing the overall reliability of the system, and further reducing the EIM of the system more reliably. Furthermore, the embodiment of the present application also provides a function model Since the frequency change is proportional to the phase change rate, the function model The phase change is optimized. Therefore, by modulating the signal to be processed by a first modulation signal generated based on the function model, a second modulation signal generated based on the first modulation signal and related characteristics, and a third modulation signal, it is beneficial to obtain a spectral response that is maximally flat with a minimum frequency shift.

[0065] The signal processing method of the present application is described below with specific application scenarios and simulation results. It can be seen from the above embodiments that the modulation period T is divided into three regions in the present application, namely:

[0066] Region 1: t = 0 to T / 4;

[0067] Region 2: t = T / 4 to T / 2;

[0068] Region 3: t=T / 2 to T.

[0069] In the first simulation scenario, the control function (Let m and a1 of the above function model be 1 to obtain the control function) as a basis, we can get the following Figure 2-a The modulation signals (i.e., the first modulation signal, the second modulation signal, and the third modulation signal) are shown in FIG. Figure 2-a The spectrum response of the modulated signal to the signal to be processed (in this scenario, the spectrum response of the signal to be processed is as shown in Figure 2-b As shown in the figure, the modulation simulation is performed and the result is as follows Figure 2-c The spectral response of the modulated signal is shown in Figure 2. Figure 2-b and Figure 2-c It can be seen that the energy spectrum of the signal to be processed is expanded through the above modulation, and a flat spectrum response is obtained.

[0070] In the second simulation scenario, the control function (Let m take 2, a1 take 1 and a2 take 1 in the above function model to obtain the control function) as a basis, we can get the following Figure 2-d The modulation signals (i.e., the first modulation signal, the second modulation signal, and the third modulation signal) are shown in FIG. Figure 2-d The spectrum response of the modulated signal to the signal to be processed (in this scenario, the spectrum response of the signal to be processed is as shown in Figure 2-b As shown in the figure, the modulation simulation is performed and the result is as follows Figure 2-e The spectral response of the modulated signal is shown in Figure 2. Figure 2-b and Figure 2-e It can be seen that the energy spectrum of the signal to be processed is expanded through the above modulation, and a flat spectrum response is obtained.

[0071] Figure 3 A signal processing device is provided for an embodiment of the present application. Figure 3 As shown, the signal processing device mainly includes:

[0072] The modulation signal generating unit 301 is used to generate a first modulation signal based on an input control function;

[0073] The first modulation unit 302 is used to modulate the signal to be processed with the first modulation signal within 0 to T / 4 of each modulation period, wherein T is the modulation period;

[0074] The second modulation unit 303 is used to modulate the signal to be processed with a second modulation signal within T / 4 to T / 2 of each modulation period, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal within the same modulation period are symmetrical about the center;

[0075] The third modulation unit 304 is used to modulate the above-mentioned signal to be processed with a third modulation signal within T / 2 to T of each modulation period, wherein the curve corresponding to the above-mentioned third modulation signal in the same modulation period is symmetrical about the central axis with the curve corresponding to the modulation signal used in the first half of the modulation period.

[0076] Optionally, the signal processing device further includes:

[0077] A determination unit, used to determine the values ​​of relevant parameters in the function model;

[0078] A function generating unit, used for generating the control function based on the values ​​of relevant parameters in the function model;

[0079] Among them, the above function model is: t represents time, and the relevant parameters in the above function model include: m, and a1 to a m .

[0080] Optionally, the modulation signal generating unit is specifically used to: generate a first modulation signal based on an input control function in each modulation cycle.

[0081] Optionally, the modulation performed by the first modulation unit 302 includes frequency modulation and / or phase modulation, the modulation performed by the second modulation unit 303 includes frequency modulation and / or phase modulation, and the modulation performed by the third modulation unit 304 includes frequency modulation and / or phase modulation.

[0082] It should be noted that the signal processing device can be used to implement the signal processing method provided by the above method embodiment. Figure 3In the example signal processing device, the division of each functional module is only for illustration. In actual application, the above functions can be assigned to different functional modules according to the needs, such as the configuration requirements of the corresponding hardware or the convenience of software implementation. That is, the internal structure of the signal processing device is divided into different functional modules to complete all or part of the functions described above. Moreover, in actual application, the corresponding functional modules in this embodiment can be implemented by the corresponding hardware, or can be completed by the corresponding hardware executing the corresponding software. The above description principles can be applied to each embodiment provided in this specification, and will not be repeated below.

[0083] As can be seen from the above, the signal processing device in the embodiment of the present application does not use a feedback loop but generates a first modulation signal through a control function, and periodically modulates the signal to be processed with the first modulation signal, the second modulation signal and the third modulation signal, so that the energy spectrum of the signal to be processed is expanded, thereby reducing the emission of EMI. Since the present application scheme does not use a feedback loop, the number of system components can be effectively reduced, thereby increasing the overall reliability of the system, and further reducing the EIM of the system more reliably. Furthermore, the function model is also provided in the embodiment of the present application Since the frequency change is proportional to the phase change rate, the function model The phase change is optimized. Therefore, by modulating the signal to be processed by a first modulation signal generated based on the function model, a second modulation signal generated based on the first modulation signal and related characteristics, and a third modulation signal, it is beneficial to obtain a spectral response that is maximally flat with a minimum frequency shift.

[0084] The present application embodiment provides a signal processing device, see Figure 4 , the signal processing device comprises:

[0085] The memory 41, the processor 42 and the computer program stored in the memory 41 and executable on the processor 42, when the processor 42 executes the computer program, implement the signal processing method described in the foregoing method embodiment.

[0086] Furthermore, the signal processing device also includes:

[0087] At least one input device 43 and at least one output device 44 .

[0088] The memory 41 , processor 42 , input device 43 , and output device 44 are connected via a bus 45 .

[0089] The input device 43 and the output device 44 may specifically be antennas.

[0090] The memory 41 may be a high-speed random access memory (RAM) memory or a non-volatile memory, such as a disk memory. The memory 41 is used to store a set of executable program codes, and the processor 42 is coupled to the memory 41 .

[0091] Furthermore, the present application also provides a computer-readable storage medium, which may be provided in the signal processing device in the above embodiments. Figure 4 The memory in the embodiment shown. The computer readable storage medium stores a computer program, and when the program is executed by the processor, the power allocation method described in the aforementioned method embodiment is implemented. Furthermore, the computer storable medium can also be a U disk, a mobile hard disk, a read-only memory (ROM), a RAM, a magnetic disk or an optical disk, etc., which can store program codes.

[0092] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0093] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0095] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or all or part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0096] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0097] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] The above is a description of the signal processing method and signal processing device provided in the present application. For those skilled in the art, according to the ideas of the embodiments of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A signal processing method, characterized in that: include: generating a first modulation signal based on an input control function; In each modulation period from 0 to T / 4, the signal to be processed is modulated by the first modulation signal, wherein T is the modulation period; In each modulation period T / 4 to T / 2, the signal to be processed is modulated with a second modulation signal, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal in the same modulation period are symmetrical about a center; In each modulation period from T / 2 to T, the signal to be processed is modulated by a third modulation signal, wherein a curve corresponding to the third modulation signal in the same modulation period is symmetrical with a curve corresponding to the modulation signal used in the first half of the modulation period about the central axis; Before the input-based control function generates the first modulation signal, the method further includes: Determine the values ​​of relevant parameters within the function model; generating the control function based on the values ​​of relevant parameters in the function model; Wherein, the function model is: t represents time, and the relevant parameters in the function model include: m, and a1 to a m .

2. The signal processing method according to claim 1, characterized in that: The generating the first modulation signal based on the input control function is: generating the first modulation signal based on the input control function in each modulation period.

3. The signal processing method according to claim 1 or 2, characterized in that: The modulating the signal to be processed by using the first modulation signal comprises: frequency modulating the signal to be processed by using the first modulation signal; The modulating the signal to be processed with the second modulation signal comprises: frequency modulating the signal to be processed with the second modulation signal; The modulating the signal to be processed by using the third modulation signal includes: frequency modulating the signal to be processed by using the third modulation signal.

4. The signal processing method according to claim 1 or 2, characterized in that: The modulating the signal to be processed by using the first modulation signal comprises: performing phase modulation on the signal to be processed by using the first modulation signal; The modulating the signal to be processed with the second modulation signal comprises: performing phase modulation on the signal to be processed with the second modulation signal; The modulating the signal to be processed with the third modulation signal includes: performing phase modulation on the signal to be processed with the third modulation signal.

5. A signal processing device, characterized in that: include: A modulation signal generating unit, configured to generate a first modulation signal based on an input control function; A first modulation unit is used to modulate the signal to be processed with the first modulation signal within 0 to T / 4 of each modulation period, wherein T is the modulation period; A second modulation unit is used to modulate the signal to be processed with a second modulation signal within T / 4 to T / 2 of each modulation period, wherein a curve corresponding to the second modulation signal and a curve corresponding to the first modulation signal within the same modulation period are symmetrical about the center; A third modulation unit, used for modulating the signal to be processed with a third modulation signal within T / 2 to T of each modulation period, wherein a curve corresponding to the third modulation signal within the same modulation period is symmetrical about the central axis with a curve corresponding to the modulation signal used in the first half of the modulation period; The signal processing device further comprises: A determination unit, used to determine the values ​​of relevant parameters in the function model; A function generating unit, configured to generate the control function based on the values ​​of relevant parameters in the function model; Wherein, the function model is: t represents time, and the relevant parameters in the function model include: m, and a1 to a m .

6. The signal processing device according to claim 5, characterized in that: The modulation signal generating unit is specifically configured to generate a first modulation signal based on an input control function in each modulation cycle.

7. The signal processing device according to claim 5 or 6, characterized in that: The modulation performed by the first modulation unit includes frequency modulation; The modulation performed by the second modulation unit includes frequency modulation; The modulation performed by the third modulation unit includes frequency modulation.

8. The signal processing device according to claim 5 or 6, characterized in that: The modulation performed by the first modulation unit includes phase modulation; The modulation performed by the second modulation unit includes phase modulation; The modulation performed by the third modulation unit includes phase modulation.

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