CN117592494A - Modulation depth adjusting method and device and card reader - Google Patents
Modulation depth adjusting method and device and card reader Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000004590 computer program Methods 0.000 claims description 13
- 230000011664 signaling Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 abstract description 10
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/02—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 application relates to a modulation depth adjusting method and device and a card reader, which are used for solving the problem that the reliability of communication between the card reader and a card is lower due to the change of an antenna, an external environment or the read card and the like of the existing card reader. The method comprises the following steps: when a read signal is transmitted through an antenna, sampling the read signal to obtain a data waveform; determining a current modulation depth of the data waveform; and when the current modulation depth of the data waveform is outside the preset interval, adjusting the preset modulation depth. Based on the method, the modulation depth of the modulated original signal can be adjusted in a self-adaptive mode, the current modulation depth of the read signal transmitted by the antenna is guaranteed to meet the modulation depth range requirement specified by the protocol standard, and the reliability of communication between the card reader and the card is improved.
Description
Technical Field
The present disclosure relates to the field of radio frequency identification technologies, and in particular, to a method and an apparatus for adjusting modulation depth, and a card reader.
Background
For a 13.56MHz card reader supporting ISO/IEC 14443type B, the transmitted signal has the requirement of modulation depth. According to the protocol standard, the modulation depth of the transmitted signal is required to be 8% -14%. The current 13.56MHz card reader supporting ISO/IEC 14443type B or card reader chip, when communicating with B type card, the transmitting signal is modulated wave, and the modulation depth of the transmitting signal is fixed, for example, the modulation depth of the card reader is set to 10%, and the current 13.56MHz card reader cannot realize real-time adjustment of the modulation depth.
However, in practical application, when a modulated wave is transmitted to a card via an antenna for communication, due to the change of external environment of the antenna, different factors such as the influence of cards of different manufacturers on the antenna, the load of the antenna changes, so that the modulation depth of the modulated wave transmitted to the card by the antenna is affected.
Disclosure of Invention
The application provides a modulation depth adjusting method, a modulation depth adjusting device and electronic equipment, which are used for solving the problem that the reliability of communication between an existing card reader and a card is low when the surrounding environment of an antenna changes.
In a first aspect, the present application provides a method for adjusting modulation depth, where the method is applied to a card reader, and the method includes:
when a read signal is transmitted through an antenna, sampling the read signal to obtain a data waveform, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
determining a current modulation depth of the data waveform;
and when the current modulation depth is outside a preset interval, adjusting the preset modulation depth.
In one possible design, the adjusting the preset modulation depth when the current modulation depth is outside a preset interval includes: when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule; and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
In one possible design, the determining the current modulation depth of the data waveform includes: determining an amplitude maximum value and an amplitude minimum value of the read signal from the data waveform; and dividing the difference between the maximum amplitude value and the minimum amplitude value by the sum of the maximum amplitude value and the minimum amplitude value to obtain the current modulation depth.
In one possible design, before the sampling of the read signal to obtain the data waveform when the read signal is transmitted through the antenna, the method further includes: converting the signaling data into an original signal; and modulating the original signal according to the preset modulation depth to obtain the reading signal.
In a second aspect, the present application provides a modulation depth adjustment device, the device comprising:
the acquisition module is used for sampling the read signal to obtain a data waveform when the read signal is transmitted through the antenna, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
a determining module for determining a current modulation depth of the data waveform;
and the adjusting module is used for adjusting the preset modulation depth when the current modulation depth is out of a preset interval.
In one possible design, the modulation module is specifically configured to: when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule; and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
In one possible design, the determining module is specifically configured to: when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule; and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
In one possible design, the device is further configured to: converting the signaling data into an original signal; and modulating the original signal according to the preset modulation depth to obtain the reading signal.
In a third aspect, the present application provides an electronic device, including:
a memory for storing a computer program;
and the processor is used for realizing the step of the modulation depth adjusting method when executing the computer program stored in the memory.
In a fourth aspect, the present application provides a computer readable storage medium having a computer program stored therein, which when executed by a processor, implements the steps of a method for adjusting modulation depth as described above.
The technical effects of each of the second to fourth aspects and the technical effects that may be achieved by each aspect are referred to above for the technical effects that may be achieved by the first aspect or each possible aspect in the first aspect, and the detailed description is not repeated here.
Drawings
Fig. 1 is a flow chart of a modulation depth adjustment method provided in the present application;
FIG. 2 is a schematic diagram of a modulation depth adjusting device provided in the present application;
FIG. 3 is a radio frequency architecture diagram of a card reader provided herein;
fig. 4 is a schematic diagram of a structure of an electronic device provided in the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings. The specific method of operation in the method embodiment may also be applied to the device embodiment or the system embodiment.
In the description of the present application "a plurality of" is understood as "at least two". "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. A is connected with B, and can be represented as follows: both cases of direct connection of A and B and connection of A and B through C. In addition, in the description of the present application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not be construed as indicating or implying a relative importance or order.
Referring to fig. 1, a flow chart of a method for adjusting modulation depth according to an embodiment of the present application is shown, and the method is applied to a card reader, and a specific implementation flow of the method is as follows:
step 101: when a read signal is transmitted through an antenna, sampling the read signal to obtain a data waveform;
in the embodiment of the application, when the card reader communicates to the card, signaling data is generated, the signaling data is converted into an original signal, and the original signal is modulated by the modem to obtain a read signal.
Specifically, the original signal is modulated according to a preset modulation depth, for example, according to a modulation depth of 10%, so as to obtain a modulated read signal. The preset modulation depth is an initially set modulation depth default value, which may be set according to actual requirements, and is not specifically limited in the embodiments of the present application.
And transmitting the read signal outwards through the antenna, and sampling the transmitted read signal when the antenna transmits the read signal to obtain the data waveform of the read signal.
Step 102: determining a current modulation depth of the data waveform;
in an embodiment of the present application, the sampled data waveform includes at least a set of amplitude maxima and amplitude minima of the read signal.
Specifically, the maximum amplitude value (waveform peak value) and the minimum amplitude value (waveform valley value) of the read signal are determined from the sampled data waveform, and the current modulation depth of the data waveform is calculated based on the determined maximum amplitude value and minimum amplitude value. The specific calculation formula is as follows:
where a is the maximum value of the amplitude in the data waveform and b is the minimum value of the amplitude in the data waveform.
And judging whether the currently transmitted read signal meets the modulation depth standard requirement or not by collecting the data waveform transmitted by the antenna and calculating the current modulation depth of the data waveform.
Step 103: and when the current modulation depth of the data waveform is outside the preset interval, adjusting the preset modulation depth.
In this embodiment of the present application, the preset interval is a set modulation depth range, for example, the preset interval is 10% -20%, and the preset interval may be set according to a protocol standard, for example, according to the protocol standard of ISO/IEC 14443type b, where the modulation depth of the required transmission signal is required to be 8% -14%.
Specifically, whether the current modulation depth of the data waveform is within a preset interval or not is judged, for example, whether the current modulation depth is within 8% -14%.
When the current modulation depth of the data waveform is within the preset interval, the read signal is directly transmitted outwards through the antenna without adjusting the preset modulation depth. At this time, the modulation depth of the read signal is required to be modulated.
And when the current modulation depth of the data waveform is outside the preset interval, adjusting the preset modulation depth. In one possible implementation, when the current modulation depth of the data waveform is greater than the maximum value of the preset interval, for example, the current modulation depth is 20%, the preset interval is 8% -15%, and the current modulation depth exceeds the preset interval, the preset modulation depth is reduced according to the set rule.
In one possible implementation, when the current modulation depth of the data waveform is smaller than the minimum value of the preset interval, for example, the current modulation depth is 5%, the preset interval is 8% -15%, and the current modulation depth does not reach the preset interval, the preset modulation depth is increased according to the set rule.
For example, the preset modulation depth may be reduced or increased by changing the maximum amplitude and the minimum amplitude of the amplitude modulation signal (carrier signal), and the adjustment method of the preset modulation depth is not particularly limited in the embodiment of the present application.
After the preset modulation depth is adjusted, the original signal is modulated by the modulation and demodulation unit according to the adjusted modulation depth, and a new read signal is obtained. When a new read signal is transmitted through the antenna, the same operations as described above are performed: and sampling the new read signal to obtain a data waveform, calculating the current modulation depth of the data waveform, and comparing the current modulation depth with a preset interval.
It should be noted that, in the embodiment of the present application, sampling of the read signal transmitted by the antenna is real-time sampling, the current modulation depth of the sampled data waveform is calculated after each sampling, and as long as the current modulation depth is outside the preset interval, the preset modulation depth is adjusted, and the original signal is re-modulated until the current modulation depth is within the preset interval, and the current modulation depth is not adjusted.
According to the method and the device, the read signal transmitted by the antenna is sampled in real time, the current modulation depth of the sampled data waveform is calculated, if the current modulation depth does not meet the modulation depth range requirement specified by the protocol standard, the preset modulation depth default value is adjusted, and then the original signal is modulated according to the adjusted modulation depth. Therefore, the modulation depth of the read signal transmitted by the final antenna can be ensured to meet the modulation depth range requirement specified by the protocol standard, the influence on the modulation depth of the transmitted read signal caused by the change of the external environment of the antenna and the like can be avoided, and the modulation depth of the read signal does not reach the protocol standard requirement, so that the communication failure between the card reader and the card is caused, and the communication reliability between the card reader and the card is ensured.
Based on the same inventive concept, the present application further provides a modulation depth adjusting device, which is applied to a card reader and used for adaptively adjusting the modulation depth of a modulated original signal, so as to ensure that the current modulation depth of a read signal transmitted by an antenna meets the modulation depth range requirement specified by a protocol standard, and referring to fig. 2, the device includes:
the acquisition module 201 is used for sampling a read signal to obtain a data waveform when the read signal is transmitted through an antenna, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
a determining module 202 that determines a current modulation depth of the data waveform;
and the adjusting module 203 is configured to adjust the preset modulation depth when the current modulation depth is outside a preset interval.
In one possible design, the modulation module 203 is specifically configured to: when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule; and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
In one possible design, the determining module 202 is specifically configured to: when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule; and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
In one possible design, the device is further configured to: converting the signaling data into an original signal; and modulating the original signal according to the preset modulation depth to obtain the reading signal.
Based on the device, the modulation depth of the modulated original signal can be adjusted in a self-adaptive mode, so that the current modulation depth of the read signal emitted by the antenna is ensured to meet the modulation depth range requirement specified by the protocol standard, and the reliability of the card reader and the card communication is ensured.
Based on the same inventive concept, the embodiment of the present application further provides a card reader for adaptively adjusting the modulation depth of the modulated original signal, so as to ensure that the current modulation depth of the read signal transmitted by the antenna meets the modulation depth range requirement specified by the protocol standard, and referring to fig. 3, the card reader includes: the device comprises a waveform acquisition unit, a modulation depth adjustment unit, an antenna, a modulation demodulation unit, a receiving unit and a transmitting unit.
The modulation and demodulation unit is used for converting the signaling data into an original signal, modulating the original signal according to a preset modulation depth to obtain a read signal, and transmitting the read signal to the transmitting unit.
In the embodiment of the application, the signaling data is signaling data of initiating card reading by the card reader, and the preset modulation depth is an initially set modulation depth default value.
And the transmitting unit is used for receiving the reading signal and transmitting the reading signal to the card through the antenna.
The waveform acquisition unit is used for sampling the read signal to obtain a data waveform when the antenna transmits the read signal, calculating the current modulation depth of the data waveform, judging whether the current modulation depth is in a preset interval or not, namely judging whether the current modulation depth meets the range required by the protocol standard or not, obtaining a judging result, and transmitting the judging result to the modulation depth adjusting unit.
Specifically, the sampled data waveform includes at least a set of amplitude maxima and amplitude minima of the read signal. And determining an amplitude maximum value (waveform peak value) and an amplitude minimum value (waveform valley value) of the read signal from the sampled data waveform, dividing the difference between the amplitude maximum value and the amplitude minimum value by the sum of the amplitude maximum value and the amplitude minimum value, and calculating to obtain the current modulation depth. And then judging whether the current modulation depth is positioned in a preset interval or not to obtain a judging result that the current modulation depth is larger than the maximum value of the preset interval or smaller than the minimum value of the preset interval.
And the modulation depth adjusting unit is used for receiving the judging result and adjusting the preset modulation depth according to the judging result.
Specifically, if the judgment result is that the current modulation depth is larger than the maximum value of the preset interval, the preset modulation depth is reduced according to the set rule. If the judgment result is that the current modulation depth is smaller than the minimum value of the preset interval, the preset modulation depth is increased according to the set rule. In the embodiment of the present application, the mode of adjusting the preset modulation depth may be to change the maximum amplitude and the minimum amplitude of the amplitude-modulated signal, or may be other modes, which is not specifically limited in the embodiment of the present application.
And the receiving unit is used for receiving the response signal transmitted by the card through the antenna and sending the response signal to the modulation and demodulation unit.
The modulation and demodulation unit is also used for receiving the response signal and demodulating the response signal to obtain data.
The modulation-demodulation unit is also used for modulating the original signal according to the adjusted modulation depth after the modulation depth adjustment unit adjusts the preset modulation depth.
Based on the card reader, the read signal transmitted by the antenna is sampled in real time through the waveform acquisition unit, the current modulation depth of the sampled data waveform is calculated, if the current modulation depth does not meet the modulation depth range requirement specified by the protocol standard, the modulation depth default value which is initially set is adjusted through the modulation depth adjustment unit, and then the original signal is modulated according to the adjusted modulation depth through the modulation and demodulation unit. Therefore, the modulation depth of the read signal transmitted by the final antenna can be ensured to meet the modulation depth range requirement specified by the protocol standard, the influence on the modulation depth of the transmitted read signal caused by the change of the external environment of the antenna and the like can be avoided, and the modulation depth of the read signal does not reach the protocol standard requirement, so that the communication failure between the card reader and the card is caused, and the communication reliability between the card reader and the card is ensured.
Based on the same inventive concept, the embodiment of the present application further provides an electronic device, where the electronic device may implement the function of the foregoing adjustment device for modulation depth, and referring to fig. 4, the electronic device includes:
at least one processor 401, and a memory 402 connected to the at least one processor 401, in this embodiment of the present application, a specific connection medium between the processor 401 and the memory 402 is not limited, and in fig. 4, the processor 401 and the memory 402 are connected by a bus 400 as an example. The bus 400 is shown in bold lines in fig. 4, and the manner in which the other components are connected is illustrated schematically and not by way of limitation. The bus 400 may be divided into an address bus, a data bus, a control bus, etc., and is represented by only one thick line in fig. 4 for ease of illustration, but does not represent only one bus or one type of bus. Alternatively, the processor 401 may be referred to as a controller, and the name is not limited.
In the embodiment of the present application, the memory 402 stores instructions executable by the at least one processor 401, and the at least one processor 401 may execute the application anomaly detection method described above by executing the instructions stored in the memory 402. Processor 401 may implement the functions of the various modules in the apparatus shown in fig. 2.
The processor 401 is a control center of the apparatus, and various interfaces and lines can be used to connect various parts of the entire control device, and by executing or executing instructions stored in the memory 402 and invoking data stored in the memory 402, various functions of the apparatus and processing data can be performed, so that the apparatus is monitored as a whole.
In one possible design, processor 401 may include one or more processing units, and processor 401 may integrate an application processor and a modem processor, wherein the application processor primarily processes operating systems, user interfaces, application programs, and the like, and the modem processor primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 401. In some embodiments, processor 401 and memory 402 may be implemented on the same chip, and in some embodiments they may be implemented separately on separate chips.
The processor 401 may be a general purpose processor such as a Central Processing Unit (CPU), digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, which may implement or perform the methods, steps and logic blocks disclosed in the embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the modulation depth adjustment method disclosed in connection with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.
Memory 402 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 402 may include at least one type of storage medium, which may include, for example, flash Memory, hard disk, multimedia card, card Memory, random access Memory (Random Access Memory, RAM), static random access Memory (Static Random Access Memory, SRAM), programmable Read-Only Memory (Programmable Read Only Memory, PROM), read-Only Memory (ROM), charged erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory), magnetic Memory, magnetic disk, optical disk, and the like. Memory 402 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 402 in the present embodiment may also be circuitry or any other device capable of implementing a memory function for storing program instructions and/or data.
By programming the processor 401, the code corresponding to the modulation depth adjustment method described in the foregoing embodiment may be cured into the chip, so that the chip can execute the steps of the modulation depth adjustment method of the embodiment shown in fig. 1 during operation. How to design and program the processor 401 is a technology well known to those skilled in the art, and will not be described in detail here.
Based on the same inventive concept, the embodiments of the present application also provide a storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the modulation depth adjustment method described in the foregoing.
In some possible embodiments, aspects of the modulation depth adjustment method provided herein may also be implemented in the form of a program product comprising program code for causing the control apparatus to carry out the steps of the modulation depth adjustment method according to various exemplary embodiments of the present application as described herein above when the program product is run on a device.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A method for adjusting modulation depth, the method being applied to a card reader, the method comprising:
when a read signal is transmitted through an antenna, sampling the read signal to obtain a data waveform, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
determining a current modulation depth of the data waveform;
and when the current modulation depth is outside a preset interval, adjusting the preset modulation depth.
2. The method of claim 1, wherein adjusting the preset modulation depth when the current modulation depth is outside a preset interval comprises:
when the current modulation depth is larger than the maximum value of the preset interval, reducing the preset modulation depth according to a set rule;
and when the current modulation depth is smaller than the minimum value of the preset interval, increasing the preset modulation depth according to the set rule.
3. The method of claim 1, wherein the determining the current modulation depth of the data waveform comprises:
determining an amplitude maximum value and an amplitude minimum value of the read signal from the data waveform;
and dividing the difference between the maximum amplitude value and the minimum amplitude value by the sum of the maximum amplitude value and the minimum amplitude value to obtain the current modulation depth.
4. The method of claim 1, further comprising, prior to said sampling the read signal when the read signal is transmitted through the antenna,:
converting the signaling data into an original signal;
and modulating the original signal according to the preset modulation depth to obtain the reading signal.
5. An apparatus for adjusting modulation depth, the apparatus comprising:
the acquisition module is used for sampling the read signal to obtain a data waveform when the read signal is transmitted through the antenna, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
a determining module for determining a current modulation depth of the data waveform;
and the adjusting module is used for adjusting the preset modulation depth when the current modulation depth is out of a preset interval.
6. A card reader, the card reader comprising: the device comprises a waveform acquisition unit, a modulation depth adjustment unit and an antenna;
the antenna transmits a read signal, wherein the read signal is obtained by modulating an original signal according to a preset modulation depth;
when an antenna transmits a read signal, the waveform acquisition unit samples the read signal to obtain a data waveform, calculates the current modulation depth of the data waveform, judges whether the current modulation depth is in a preset interval or not to obtain a judgment result, and sends the judgment result to the modulation depth adjustment unit;
the modulation depth adjusting unit receives the judging result and adjusts the preset modulation depth according to the judging result.
7. The card reader of claim 6, wherein the card reader further comprises: the system comprises a modulation and demodulation unit, a receiving unit and a transmitting unit;
the modulation and demodulation unit converts signaling data into the original signal, modulates the original signal according to the preset modulation depth to obtain the read signal, and sends the read signal to the transmitting unit;
the transmitting unit receives the read signal and transmits the read signal via the antenna;
the receiving unit receives a response signal via the antenna and transmits the response signal to the modem unit;
the modulation and demodulation unit receives the response signal and demodulates the response signal to obtain data.
8. The card reader of claim 7 wherein the modulation unit is further configured to:
and after the modulation depth adjusting unit adjusts the preset modulation depth, modulating the original signal according to the adjusted modulation depth.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for carrying out the method steps of any one of claims 1-4 when executing a computer program stored on said memory.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program which, when executed by a processor, implements the method steps of any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631027.6A CN117592494A (en) | 2023-11-30 | 2023-11-30 | Modulation depth adjusting method and device and card reader |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631027.6A CN117592494A (en) | 2023-11-30 | 2023-11-30 | Modulation depth adjusting method and device and card reader |
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| CN117592494A true CN117592494A (en) | 2024-02-23 |
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| CN202311631027.6A Pending CN117592494A (en) | 2023-11-30 | 2023-11-30 | Modulation depth adjusting method and device and card reader |
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| Country | Link |
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| CN (1) | CN117592494A (en) |
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