CN111682849B - Anti-interference method, medium, device and anti-interference transmission system - Google Patents
Anti-interference method, medium, device and anti-interference transmission system Download PDFInfo
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- CN111682849B CN111682849B CN202010442906.4A CN202010442906A CN111682849B CN 111682849 B CN111682849 B CN 111682849B CN 202010442906 A CN202010442906 A CN 202010442906A CN 111682849 B CN111682849 B CN 111682849B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides an anti-interference method, medium, device and anti-interference transmission system, wherein the anti-interference method comprises the following steps: receiving a carrier signal; the carrier signal comprises at least two pulse signals; starting timing when the first pulse signal is detected, and counting the pulse signals at the same time; and generating a variable frequency signal according to the counting result. According to the invention, the anti-interference capability of variable frequency signal transmission is improved by detecting the number of pulses of the carrier frequency in the timing time, and the transmitted variable frequency signal is more accurately restored.
Description
Technical Field
The invention belongs to the technical field of variable frequency signal processing, relates to a processing method during variable frequency signal transmission, and particularly relates to an anti-interference method, medium, device and anti-interference transmission system.
Background
At present, in a variable frequency signal transmission system, the transmission of a variable frequency signal can be realized through the transmission of a rising edge (or a falling edge), but the anti-interference capability is weak. When an interfering pulse signal occurs, a sudden change in the received frequency is caused, thereby distorting the frequency signal. As shown in fig. 1, the source signal is an F1 signal, which is converted into a pulse signal TX, and after signal transmission, an RX signal with the same phase is received, and if the RX signal is subjected to a Noise signal (Noise), the signal is recovered to a frequency signal, and becomes an F2 signal, and the Noise signal (Noise) correspondingly generates an F2 high level, which causes signal distortion.
Therefore, how to provide an anti-interference method, medium, device and anti-interference transmission system to solve the defects that the prior art cannot more accurately restore the transmitted variable frequency signal, etc. is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above drawbacks of the prior art, an objective of the present invention is to provide an anti-interference method, medium, device and anti-interference transmission system, which are used for solving the problem that the prior art cannot more accurately restore the transmitted variable frequency signal.
To achieve the above and other related objects, an aspect of the present invention provides an anti-interference method, including: receiving a carrier signal; the carrier signal comprises at least two pulse signals; starting timing when the first pulse signal is detected, and counting the pulse signals at the same time; and generating a variable frequency signal according to the counting result.
In an embodiment of the present invention, the step of counting the pulse signals and generating the variable frequency signal according to the counting result includes: after starting timing, setting the timing signal to be high level/low level; the high level/low level duration time period and the carrier signal period need to meet a preset numerical relation; counting the pulse signals in the high level/low level duration time period, and judging whether the counting result is more than or equal to 2; if yes, setting the variable frequency signal to be high level; if not, the number of the pulse signal counts is set to 0, and the variable frequency signal is set to be low level.
In an embodiment of the present invention, after the timing is finished, the timing signal is set to low level/high level, until the next time the pulse signal is acquired, the timing signal is set to high level/low level again.
In an embodiment of the present invention, the predetermined numerical relationship is: the high level/low level duration time period is greater than or equal to a product of the number of pulse signals and the period of the carrier signal.
In another aspect the invention provides a medium having stored thereon a computer program which when executed by a processor implements the anti-tamper method.
In yet another aspect, the present invention provides an anti-interference device, including: a processor and a memory; the memory is used for storing a computer program, and the processor is used for executing the computer program stored in the memory so as to enable the anti-interference device to execute the anti-interference method.
A final aspect of the present invention provides an anti-interference transmission system, comprising: the variable frequency signal transmitting device is used for taking a variable frequency signal to be transmitted as a source signal, and performing signal modulation on the source signal to generate a carrier signal; the carrier signal comprises at least two pulse signals; the pulse signal transmission module is connected with the variable frequency signal transmission device and is used for transmitting the carrier signal; the anti-interference device is connected with the pulse signal transmission module and is used for receiving a carrier signal; starting timing when the first pulse signal is detected, and counting the pulse signals at the same time; and generating a variable frequency signal according to the counting result.
In an embodiment of the present invention, the variable frequency signal transmitting device changes a signal frequency of the source signal into a carrier frequency of the carrier signal through signal modulation; the number of the pulse signals is 2n-1, wherein n is greater than or equal to 2.
In an embodiment of the invention, the pulse signal transmission module is a coupling device; the coupling device is used for transmitting the pulse signals to the anti-interference device in an isolated mode through the variable-frequency signal transmitting device.
As described above, the anti-interference method, medium, device and anti-interference transmission system of the present invention have the following beneficial effects:
the anti-interference capability of the frequency conversion signal transmission is improved by detecting the number of pulses of the carrier frequency in the timing time, and the transmitted frequency conversion signal is restored more accurately. As long as the carrier frequency is much larger than the signal frequency, the effect of delay counting caused by the interfering signal is small, i.e. the anti-interference capability is strong enough. For the occasion of source signal frequency change, the receiving end can completely restore the frequency signal.
Drawings
Fig. 1 is a timing diagram of the prior art frequency conversion signal transmission.
Fig. 2 is a schematic flow chart of an anti-interference method according to an embodiment of the invention.
Fig. 3 is a timing diagram illustrating anti-interference processing of a variable frequency signal according to an embodiment of the anti-interference method of the present invention.
Fig. 4 is a timing diagram illustrating anti-interference processing of a variable frequency signal according to another embodiment of the anti-interference method of the present invention.
Fig. 5 is a schematic structural connection diagram of an anti-interference device according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a circuit application of the anti-interference transmission system according to an embodiment of the invention.
Description of element reference numerals
5. Anti-interference device
51. Processor and method for controlling the same
52. Memory device
53. Communication interface
54. System bus
S21 to S23 steps
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The invention provides an anti-interference method, which improves the anti-interference capability of variable frequency signal transmission by detecting the number of pulses of carrier frequency in a timing time, and more accurately restores the transmitted variable frequency signal.
The principle and implementation of the anti-interference method, medium, device and anti-interference transmission system of the present embodiment will be described in detail below with reference to fig. 2 to 6, so that those skilled in the art can understand the anti-interference method, medium, device and anti-interference transmission system of the present embodiment without creative labor.
Referring to fig. 2, a schematic flow chart of an anti-interference method according to an embodiment of the invention is shown. The anti-interference method is applied to the variable frequency signal receiving device. The variable frequency signal to be transmitted is converted into a pulse signal through signal modulation, and the variable frequency signal transmitting device transmits the pulse signal to the variable frequency signal receiving device through the pulse signal transmission module. As shown in fig. 2, the anti-interference method specifically includes the following steps:
s21, receiving a carrier signal; the carrier signal comprises at least two pulse signals.
In this embodiment, the signal frequency of the source signal is changed into the carrier frequency of the carrier signal by signal modulation; the number of the pulse signals is 2n-1, wherein n is greater than or equal to 2.
S22, when the first pulse signal is detected, starting timing, and simultaneously counting the pulse signals.
The detection method during counting of the pulse signals includes, but is not limited to, rising edge detection, falling edge detection and level detection.
S23, generating a variable frequency signal according to the counting result.
In one embodiment, S23 includes:
(1) After the start of the timer, the timing signal is set to a high level.
(2) And counting the pulse signals in the high-level duration time period, and judging whether the counting result is greater than or equal to 2.
(3) If yes, setting the variable frequency signal to be high level; if not, the number of the pulse signal counts is set to 0, and the variable frequency signal is set to be low level.
In this embodiment, after the end of the timer, the timing signal is set to a low level until the timing signal is set to a high level again the next time the pulse signal is acquired.
In another embodiment, S23 includes:
(1) After the start of the timer, the timing signal is set to a low level.
(2) And counting the pulse signals in the low-level duration time period, and judging whether the counting result is greater than or equal to 2.
(3) If yes, setting the variable frequency signal to be high level; if not, the number of the pulse signal counts is set to 0, and the variable frequency signal is set to be low level.
In this embodiment, after the end of the timer, the timing signal is set to a high level until the timing signal is set to a low level again the next time the pulse signal is acquired.
It should be noted that, the duration of the high level/low level and the period of the carrier signal need to satisfy a preset numerical relationship; the timing signal may be set to a high level for a period of time during which the high level continues, or may be set to a low level for a period of time during which the low level continues when the pulse signal is counted.
Further, the preset numerical relationship is: the high level/low level duration time period is greater than or equal to the product of the number of pulse signals and the period of the carrier signal, so that the high level/low level duration time period comprises at least two pulse signals; specifically, the duration of the high level/low level is greater than or equal to n/Fmod, where n is greater than or equal to 2, fmod is the carrier frequency, 1/Fmod is the period of the carrier signal, and n/Fmod indicates that the duration of the high level/low level is greater than or equal to the period of n carrier signals.
Referring to fig. 3, a timing diagram of anti-interference processing of a variable frequency signal according to an embodiment of the anti-interference method of the present invention is shown. As shown in fig. 3, the source signal is an F1 signal, and is converted into an edge pulse signal TX, and the TX signal does not transmit a single pulse signal, but the number of transmitted pulses is equal to or greater than (2 n-1); the RX signal also receives the same phase pulse signal and if an interference signal (Noise) is received, as shown in fig. 3. At a receiving end, when a pulse signal is received, an One-shot timer is started, the One-shot timer is a One-shot (One-shot) mode timer, and when a timing signal (Toneslot signal) is at a high level, n (n is more than or equal to 2) pulse signals are counted and received, and an F2 signal is set to be high; if n pulse signals are not accumulated in a high level stage of the timing signal (Toneshot signal), the counter is reset after the timing signal (Toneshot signal) becomes a low level, and the high F2 signal is not set. The timing signal (Toneshot signal) will go high again and time the next time the pulse signal is received.
Referring to fig. 4, a timing diagram of anti-interference processing of a variable frequency signal according to another embodiment of the anti-interference method of the present invention is shown. As shown in fig. 4, if the interference signal (Noise) arrives just before the TX signal is transmitted, the timing signal (Toneshot signal) is set high, and if the timing signal (Toneshot signal) just goes low, the RX receives the true (n-1) th pulse signal (or accumulates less than n pulses), and the F2 signal cannot be set high. However, the timing signal (Toneshot signal) will continue to go high when the next pulse signal is received, and the number of remaining pulses m (2 n-1) - (n-1), i.e., m is greater than or equal to n. The F2 signal can also be made high. As long as the carrier frequency Fmod is much larger than the signal frequency, the effect of the delay caused by the above reasons is small.
It should be noted that, during the transmission of the variable frequency signal, an interference signal is generated due to an ESD (Electro-Static discharge) test or a surge phenomenon, and a case of generating an interference pulse signal is most common, so that by providing an anti-interference method for an interference pulse signal, the accuracy of the transmission of the variable frequency signal is greatly improved.
The protection scope of the anti-interference method of the present invention is not limited to the execution sequence of the steps listed in the present embodiment, and all the schemes implemented by increasing or decreasing the steps and replacing the steps according to the prior art by using the principles of the present invention are included in the protection scope of the present invention.
The present embodiment provides a computer storage medium having stored thereon a computer program which, when executed by a processor, implements the tamper resistant method.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by computer program related hardware. The aforementioned computer program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned computer-readable storage medium includes: various computer storage media such as ROM, RAM, magnetic or optical disks may store program code.
Referring to fig. 5, a schematic structural connection diagram of an anti-interference device according to an embodiment of the invention is shown. As shown in fig. 5, the present embodiment provides an anti-interference device 5, where the anti-interference device 5 may be a hardware circuit designed by a logic gate, a flip-flop, a capacitor, a resistor, a diode, etc. for receiving a variable frequency signal and resisting interference, so as to save the design cost of the anti-interference device or improve the integration level of the circuit applied by the anti-interference device; the integrated circuit can also be an existing integrated 51 single-chip microcomputer, an STM32 single-chip microcomputer and the like. When the anti-interference device 5 is a single chip microcomputer, the anti-interference device 5 includes: a processor 51, a memory 52, a communication interface 53, or/and a system bus 54; the memory 52 and the communication interface 53 are connected to the processor 51 via a system bus 54 and perform communication with each other, the memory 52 is used for storing a computer program, the communication interface 53 is used for communicating with other anti-tamper devices, and the processor 51 is used for running the computer program to cause the anti-tamper device 5 to perform the steps of the anti-tamper method.
The system bus 54 mentioned above may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, or the like. The system bus may be classified into an address bus, a data bus, a control bus, and the like. The communication interface 53 is used to enable communication between the database access device and other tamper resistant devices such as clients, read-write libraries and read-only libraries. The memory 52 may include a random access memory (Random Access Memory, simply RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.
The processor 51 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but also digital signal processors (Digital Signal Processing, DSP for short), application specific integrated circuits (Alication Specific Integrated Circuit, ASIC for short), field programmable gate arrays (Field Programmable Gate Array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
The anti-interference transmission system of the invention comprises: the device comprises a variable frequency signal transmitting device, a pulse signal transmission module and an anti-interference device.
The variable frequency signal transmitting device is used for taking a variable frequency signal to be transmitted as a source signal, and performing signal modulation on the source signal to generate a carrier signal; the carrier signal comprises at least two pulse signals.
The pulse signal transmission module is connected with the variable frequency signal sending device and is used for transmitting the carrier signal.
The anti-interference device is a variable frequency signal receiving device, is connected with the pulse signal transmission module and is used for receiving carrier signals; starting timing when the first pulse signal is detected, and counting the pulse signals at the same time; and generating a variable frequency signal according to the counting result.
In this embodiment, the variable frequency signal transmitting device changes the signal frequency of the source signal into the carrier frequency of the carrier signal through signal modulation; the number of the pulse signals is 2n-1, wherein n is greater than or equal to 2.
In this embodiment, the pulse signal transmission module is a coupling device; the coupling device is used for transmitting the pulse signals to the anti-interference device in an isolated mode through the variable-frequency signal transmitting device. The coupling device is preferably a coupling inductance, and can also be an optical coupler or other coupling devices capable of realizing isolation transmission of variable frequency signals.
Referring to fig. 6, a schematic circuit diagram of an anti-interference transmission system according to an embodiment of the invention is shown. The anti-interference transmission system is applied to a synchronous rectification flyback converter circuit, and is preferably applied to a synchronous rectification isolation flyback converter. As shown in fig. 6, C1 is an energy storage capacitor at an input end, R1, C2 and D1 form an absorption circuit of primary side leakage inductance energy, P1 is a switching tube of a flyback converter, R2 is a current sampling resistor of a primary side loop, T1 is a transformer of the flyback converter, P2 is a secondary side synchronous rectifying tube, C3 is an output end energy storage capacitor, R3 is secondary side loop current sampling, and R4 and R5 are output voltage sampling.
Specifically, in FIG. 6, the input voltage V is parallel across the capacitor C1 IN The positive pole of a capacitor C1 is connected with one end of a capacitor C2, one end of a resistor R1 and a first end of a transformer T1, the other end of the capacitor C2 and the other end of the resistor R1 are connected with a cathode of a diode D1, an anode of the diode D1 is connected with a second end of the transformer T1 and a source of a switching tube P1, a grid electrode of the switching tube P1 is connected with an anti-interference device, a drain electrode of the switching tube P1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the ground of a primary side, a third end of the transformer T1 is connected with one end of the capacitor C3, a fourth end of the transformer T1 is connected with a drain electrode of the switching tube P2, a source of the switching tube P2 is connected with the other end of the capacitor C3 and one end of the resistor R3, two ends of the resistor R3 are connected with a variable frequency signal transmitting device, a grid electrode of the switching tube P2 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with one end of the resistor R5 and the variable frequency signal transmitting device, and the other end of the resistor R5 is connected with the ground of a secondary side.
Specifically, in fig. 6, the anti-interference device is a variable frequency signal receiving end or receiving end, and is a primary side control device, and is mainly used for controlling the switching tube P1 of the flyback converter. In fig. 6, the variable frequency signal transmitting device is a secondary side control device, and is mainly used for controlling the P2 switching tube during synchronous rectification. The variable frequency signal transmitting device converts a variable frequency signal to be transmitted into a pulse signal through signal modulation, the pulse signal of the pulse signal transmitting end is transmitted to a pulse signal receiving end of the anti-interference device through a pulse signal transmission module, and the anti-interference device executes the anti-interference method to restore frequency information of the variable frequency signal to be transmitted.
In summary, the anti-interference method, medium, device and anti-interference transmission system of the invention improve the anti-interference capability of the variable frequency signal transmission by detecting the number of pulses of the carrier frequency in the timing time, and more accurately restore the transmitted variable frequency signal. As long as the carrier frequency is much larger than the signal frequency, the effect of delay counting caused by the interfering signal is small, i.e. the anti-interference capability is strong enough. For the occasion of source signal frequency change, the receiving end can completely restore the frequency signal. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. An anti-interference method, comprising:
receiving a carrier signal, the carrier signal comprising at least two pulse signals;
starting timing when a first pulse signal is detected;
simultaneously counting the pulse signals, generating a variable frequency signal according to a counting result, and comprising the following steps:
after starting timing, setting a timing signal to be high level/low level, wherein the continuous time period of the high level/low level and the period of the carrier signal need to meet a preset numerical relation, and the preset numerical relation is that the continuous time period of the high level/low level is larger than or equal to the product of the number of pulse signals and the period of the carrier signal;
counting the pulse signals in the high level/low level duration time period, and judging whether the counting result is more than or equal to 2;
if yes, setting the variable frequency signal to be high level;
if not, the number of the pulse signal counts is set to 0, and the variable frequency signal is set to be low level.
2. The tamper resistant method of claim 1, wherein:
after the timing is finished, the timing signal is set to be low level/high level, and the timing signal is set to be high level/low level again until the next time the pulse signal is acquired.
3. A medium having stored thereon a computer program, which when executed by a processor implements the tamper-resistant method of any of claims 1 to 2.
4. An anti-tamper device, comprising: a processor and a memory;
the memory is configured to store a computer program, and the processor is configured to execute the computer program stored in the memory, to cause the tamper resistant device to perform the tamper resistant method according to any one of claims 1 to 2.
5. An interference-free transmission system, comprising:
the variable frequency signal transmitting device is used for taking a variable frequency signal to be transmitted as a source signal, carrying out signal modulation on the source signal to generate a carrier signal, wherein the carrier signal comprises at least two pulse signals;
the pulse signal transmission module is connected with the variable frequency signal transmission device and is used for transmitting the carrier signal;
the anti-interference device is connected with the pulse signal transmission module and is used for:
receiving a carrier signal;
starting timing when a first pulse signal is detected;
after starting timing, setting a timing signal to be high level/low level, wherein the continuous time period of the high level/low level and the period of the carrier signal need to meet a preset numerical relation, and the preset numerical relation is that the continuous time period of the high level/low level is larger than or equal to the product of the number of pulse signals and the period of the carrier signal;
counting the pulse signals in the high level/low level duration time period, and judging whether the counting result is more than or equal to 2;
if yes, setting the variable frequency signal to be high level;
if not, the number of the pulse signal counts is set to 0, and the variable frequency signal is set to be low level.
6. The tamper resistant transmission system of claim 5, wherein:
the variable frequency signal transmitting device changes the signal frequency of the source signal into the carrier frequency of the carrier signal through signal modulation; the number of the pulse signals is 2n-1, wherein n is greater than or equal to 2.
7. The tamper resistant transmission system of claim 5, wherein:
the pulse signal transmission module is a coupling device; the coupling device is used for transmitting the pulse signals to the anti-interference device in an isolated mode through the variable-frequency signal transmitting device.
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