CN115603666A

CN115603666A - Device and method for demodulation and demodulation equipment

Info

Publication number: CN115603666A
Application number: CN202211507960.8A
Authority: CN
Inventors: 李卫东
Original assignee: Ziguang Tongxin Microelectronics Co Ltd
Current assignee: Ziguang Tongxin Microelectronics Co Ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-01-13
Anticipated expiration: 2042-11-29
Also published as: CN115603666B

Abstract

The application relates to the technical field of radio frequency signal processing and discloses a device for demodulation. And sending a control word to the configurable envelope detection module through the digital control unit module according to the transmission rate of the signal to be demodulated, so that the configurable envelope detection module adjusts the resistance value of the envelope detection circuit, and then detects the signal to be demodulated to obtain an envelope signal. And then carrying out waveform conversion on the envelope signal through an envelope signal processing module to obtain a demodulation signal. In this way, the resistance value of the envelope detection circuit is adjusted according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible. The application also discloses a method for demodulation and demodulation equipment.

Description

Device and method for demodulation and demodulation equipment

Technical Field

The present application relates to the field of radio frequency signal processing technology, and for example, to an apparatus and method for demodulation and a demodulation device.

Background

At present, with the rapid development of microelectronic technology, smart card technology plays an increasingly important role in many fields such as mobile communication, social security medical treatment, financial payment, electronic passports, and the like. Because of the wide application of the smart card chip, users put higher requirements on the transmission speed and the transmission data volume of the smart card chip, so that the smart card compatible with low-baud rate and ultrahigh-baud rate communication can meet the market demands more. In the ISO/IEC14443 standard protocol, a number of different types of cards are defined, for example: TYPE B TYPE cards and VHBR (very high baud rate) TYPE cards. The TPYE B signal output from the TPYE B type card and the VHBR signal output from the VHBR type card are encoded in NRZ-L (non-return-to-zero level coding) and modulated in 10% ASK (amplitude shift keying), which differ only in transmission rate. However, the transmission rate of the TPYE B signal is thousands of levels. The transmission rate of the VHBR signal is in the mega-level, and the difference of the transmission rates is too large, so that different demodulation methods and devices can be used for demodulation. For example: chinese patent document CN105656828B discloses a decoder for decoding BPSK modulation signals transmitted by TYPE B cards in ISO/IEC14443 protocol, which includes: the BPSK standard logic 1 waveform generating circuit is used for outputting a BPSK standard subcarrier logic 1 waveform signal with the duty ratio of 50% when TR1 does not finish synchronization in the TYPE B synchronization period and the rising edge of a continuous effective BPSK modulation signal is detected; a signal synchronization bit boundary detection circuit for detecting the switching from TR1 to the frame header when TR1 has not finished synchronization and outputting a synchronization end flag signal; the correlation method counter circuit is connected with the BPSK standard logic 1 waveform generating circuit and the signal synchronization bit boundary detecting circuit; after the data stream logic 0 or 1 is BPSK modulated and coded, using BPSK standard subcarrier and waveform to be decoded received by receiving circuit to make same or logic processing under the configurable selected correlation window, and using counter to accumulate and count the obtained correlation; grouping a plurality of subcarriers in one bit into front and back groups for correlation processing and counting; the decision data decoding circuit is connected with the correlation method counter circuit; and after the front group and the rear group of the related method counters are obtained, the difference value is made between the front group and the rear group, the group of the counter values with the larger absolute value is taken as the data of the effective logic judgment decoding, and the logic 0 or 1 of the bit is decoded according to the group of the counter values. The Chinese patent document with publication number CN110490015A discloses a method for improving ultra-high baud rate (VHBR) communication compatibility, which supports a non-contact or double-interface smart card chip of ISO/IEC14443 protocol and mainly comprises a detection module, an amplification module, a quantization module, a multi-channel decoding module and a judgment and selection module; wherein: a detection module: detecting signals of an antenna port LA or LB to output envelope signals; an amplification module: amplifying an output signal of the detection module for subsequent quantization processing; a quantization module: carrying out digital quantization on an output signal of the amplification module and outputting a square wave signal; a multipath decoding module: decoding the square wave signal of the quantization module, wherein the ISO/IEC14443 marks that the specified encoding mode is a non-return-to-zero code (NRZ); the decoding module comprises a plurality of decoding branches which simultaneously decode the square wave signals output by the quantization module and respectively output the decoding data of the branches; a judgment and selection module: and judging the multi-path decoding data output by the decoding module, and selecting a correct path to output the data according to a judgment result.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: it is not possible to compatibly demodulate the TYPE B signal and the VHBR signal having different transmission rates.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a device and a method for demodulation and demodulation equipment, so as to be compatible with the demodulation of a TYPE B signal and a VHBR signal.

In some embodiments, the apparatus for demodulating comprises: the digital control unit module is sequentially connected with the configurable envelope detection module and the envelope signal processing module; the configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable; the digital control unit module is used for acquiring the transmission rate of a signal to be demodulated; acquiring a control word corresponding to the transmission rate; sending the control word to a configurable envelope detection module, and triggering the configurable envelope detection module to adjust the resistance value of the envelope detection circuit according to the control word; the configurable envelope detection module is connected with the digital control unit module; the configurable envelope detection module is used for acquiring the signal to be demodulated and the control word sent by the digital control unit module; adjusting the resistance value of the envelope detection circuit according to the control word, and then detecting the signal to be demodulated to obtain an envelope signal; sending the envelope signal to an envelope signal processing module; the envelope signal processing module is connected with the configurable envelope detection module; the envelope signal processing module is used for receiving the envelope signal sent by the configurable envelope detection module; and carrying out waveform conversion on the envelope signal to obtain a demodulation signal.

In some embodiments, the method for demodulating comprises: acquiring a transmission signal; acquiring the transmission rate of a signal to be demodulated according to the transmission signal; and receiving a signal to be demodulated by using the transmission rate, and inputting the signal to be demodulated into the device for demodulating to obtain a demodulated signal.

In some embodiments, the demodulation apparatus comprises a processor and a memory storing program instructions, the processor being configured, upon execution of the program instructions, to perform the method for demodulation described above.

The device, the method and the demodulation equipment for demodulation provided by the embodiment of the disclosure can realize the following technical effects: and sending a control word corresponding to the transmission rate to the configurable envelope detection module through the digital control unit module according to the transmission rate of the signal to be demodulated, so that the configurable envelope detection module adjusts the resistance value of the envelope detection circuit, and then detecting the signal to be demodulated to obtain an envelope signal. And then carrying out waveform conversion on the envelope signal through an envelope signal processing module to obtain a demodulation signal. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, the resistance value of the envelope detection circuit is adjusted by transmitting a control word according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic diagram of an apparatus for demodulation according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a first method for demodulation provided by an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a second method for demodulation provided by an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a third method for demodulation provided by the embodiments of the present disclosure;

FIG. 5 is a schematic diagram of a system for demodulation provided by embodiments of the present disclosure;

fig. 6 is a schematic diagram of a demodulation apparatus provided in an embodiment of the present disclosure.

Reference numerals are as follows:

1: a digital control unit module; 2: a configurable envelope detection module; 3: an envelope signal processing module; 4: a card machine device; 5 an envelope detection circuit; 6: a fully differential proportional amplifying circuit; 7: a hysteresis comparison circuit; 8: a shaping circuit; 9: a demodulation device.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the disclosed embodiments can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

As shown in fig. 1, an embodiment of the present disclosure provides an apparatus for demodulation, including: a digital control unit module 1, a configurable envelope detection module 2 and an envelope signal processing module 3. And the digital control unit module 1 is sequentially connected with the configurable envelope detection module 2 and the envelope signal processing module 3. The configurable envelope detection module 2 comprises an envelope detection circuit. The resistance value of the envelope detection circuit is adjustable. The digital control unit module 1 is used for acquiring the transmission rate of the signal to be demodulated. And acquiring a control word corresponding to the transmission rate. And sending the control word to the configurable envelope detection module, and triggering the configurable envelope detection module to adjust the resistance value of the envelope detection circuit according to the control word. And the configurable envelope detection module 2 is connected with the digital control unit module. The configurable envelope detection module is used for acquiring a signal to be demodulated and a control word sent by the digital control unit module. Adjusting the resistance value of an envelope detection circuit according to the control word, and then detecting a signal to be demodulated to obtain an envelope signal; the envelope signal is sent to an envelope signal processing module. And the envelope signal processing module 3 is connected with the configurable envelope detection module. The envelope signal processing module is used for receiving the envelope signal sent by the configurable envelope detection module. And carrying out waveform conversion on the envelope signal to obtain a demodulation signal.

By adopting the device for demodulation provided by the embodiment of the disclosure, the digital control unit module sends the control word corresponding to the transmission rate to the configurable envelope detection module according to the transmission rate of the signal to be demodulated, so that the configurable envelope detection module adjusts the resistance value of the envelope detection circuit, and then detects the signal to be demodulated to obtain the envelope signal. And then, carrying out waveform conversion on the envelope signal through an envelope signal processing module to obtain a demodulation signal. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, the resistance value of the envelope detection circuit is adjusted by transmitting a control word according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible.

In some embodiments, the configurable envelope detection module is an envelope detection circuit. A plurality of electronic devices with variable resistance values are arranged in the envelope detection ground circuit, for example: and (4) an adjustable resistor. The envelope detection circuit can adjust the resistance value at both ends of the envelope detection circuit by adjusting the resistance value of its internal electronic components, thereby adjusting the pass band of the envelope detection circuit. Thus, the envelope detection circuit can detect a signal to be demodulated whose transmission rate is within the passband.

In some embodiments, a plurality of switch modules are disposed within the envelope detection circuitry. The resistance values of the circuits connected with the switch modules are different. The configurable envelope detection module is connected with circuits with different resistance values by controlling connection and disconnection of the switch module, so that the resistance values at two ends of the envelope detection circuit can be adjusted, and the pass band of the envelope detection circuit can be adjusted. In this way, the envelope detection circuit can detect a signal to be demodulated whose transmission rate is within the passband. Meanwhile, the influence of noise and interference signals outside a passband can be inhibited while the signal to be demodulated in the passband is detected, and the quality of the envelope signal output by the detection circuit is improved.

Further, the digital control unit module obtains the control word corresponding to the transmission rate by the following method: utilizing a preset transmission rate control database to perform table look-up operation on the transmission rate to obtain a control word corresponding to the transmission rate; the transmission rate control database stores the corresponding relationship between the transmission rate and the control word. In some embodiments, the control word is a letter or a number.

Optionally, the envelope signal processing module comprises: the device comprises an amplifying module, a hysteresis comparing module and a shaping module. The amplifying module is connected with the hysteresis comparing module and the shaping module in sequence. The amplifying module is used for acquiring the envelope signal and amplifying the envelope signal to obtain an amplified signal. And sending the amplified signal to a hysteresis comparison module, and triggering the hysteresis comparison module to convert the amplified signal into a square wave to obtain a signal to be shaped. And the hysteresis comparison module is connected with the amplification module. The hysteresis comparison module is used for receiving the amplified signal sent by the amplification module. And converting the amplified signal into a square wave signal to obtain a signal to be shaped. And sending the signal to be shaped to a shaping module, and triggering the shaping module to shape the signal to be shaped. And the shaping module is connected with the hysteresis comparison module. The shaping module is used for receiving a signal to be shaped sent by the hysteresis comparison module; and shaping the signal to be shaped to obtain a demodulation signal. In this way, by performing waveform conversion on the envelope signal by the envelope signal processing block, a demodulated signal can be obtained.

Optionally, the signal to be demodulated is a TYPE B signal or a VHBR super-baud rate signal.

In some embodiments, the transmission rate of the TYPE B signal is 106Kbit/s, 212Kbit/s, 424Kbit/s or 848Kbit/s at kilolevel, and the VHBR signal transmission speed is 1.7Mbit/s, 3.4Mbit/s or 6.8Mbit/s at mega level. Along with the improvement of the baud rate, the transmission quantity of data is also increased, and the resistance value of the envelope detection circuit is adjusted by utilizing the digital control unit module to send a control word according to the transmission rate of the signal to be demodulated. The envelope detection module can detect TPYE B signals with the transmission rate of thousand levels and VHBR signals with the transmission rate of million levels, and therefore demodulation of TYPE B signals and VHBR signals is compatible.

Optionally, the envelope signal is a sinusoidal signal.

Optionally, the amplified signal comprises a first lag signal and a second lag signal; and the first hysteresis signal and the second hysteresis signal are differential signals.

In some embodiments, the amplification module is a fully differential proportional amplification circuit. After the envelope signal is amplified by the fully-differential proportional amplifying circuit, a first hysteresis signal and a second hysteresis signal are output. The first hysteresis signal and the second hysteresis signal are differential signals. Thus, since both the TYPE B signal and the VHBR signal are modulated by 10% ASK, the modulation amplitude is shallow. After the envelope signal can be amplified through the fully differential proportional amplifying circuit, the conversion of subsequent waveforms is facilitated. And high-power consumption and high-precision ADC equipment is not needed, so that the power consumption is reduced. Meanwhile, compared with the method of amplifying the envelope signal by using a single-ended proportional amplifying circuit, the envelope signal is amplified by using a fully differential proportional amplifying circuit. The influence of noise and direct current offset can be better inhibited, the performance requirement of the hysteresis comparison module is reduced, and the cost is lower. In addition, even if the transmission distance is long, the envelope signal is amplified through the amplifying module, and the conversion of the subsequent waveform can be facilitated.

Further, the hysteresis comparison module is configured to convert the amplified signal to a square wave signal by: obtaining a difference signal between the first hysteresis signal and the second hysteresis signal; comparing the difference signal with a preset reference signal to obtain a comparison result; and acquiring the signal to be shaped according to the comparison result. In some embodiments, the hysteresis comparison module is a hysteresis comparison circuit. Therefore, the difference signal between the first hysteresis signal and the second hysteresis signal is compared with the preset reference signal through the hysteresis comparison module to obtain the comparison result, and the signal to be shaped is obtained according to the comparison result, so that the demodulation error problem caused by noise can be reduced, and the working stability of the system is improved.

In some embodiments, the hysteresis comparison module determines the preset first voltage value as the value of the signal to be shaped in case the value of the difference signal is smaller than the value of the reference signal. And in the case that the value of the difference signal is greater than that of the reference signal, the hysteresis comparison module determines a preset second voltage value as the value of the signal to be shaped. When the first voltage value is a high level voltage value, the second voltage value is a low level voltage value. When the first voltage value is a low level voltage value, the second voltage value is a high level voltage value.

Further, the shaping module is configured to shape the signal to be shaped by: and carrying out level conversion on the signal to be shaped. And shaping the signal after the level conversion to obtain a demodulation signal. Thus, the voltage domain of the signal to be shaped output by the hysteresis comparison module is higher. And the shaping module is used for carrying out level conversion on the signal to be shaped and shaping. The voltage domain of the signal to be demodulated can be reduced, so that the voltage domain of the obtained demodulated signal is in a preset range. Thereby facilitating decoding of the demodulated signal.

Furthermore, the shaping module is further configured to send the demodulated signal to the digital control unit module, and trigger the digital control unit module to decode the demodulated signal. In some embodiments, the shaping module is a shaping circuit.

Further, the digital control unit module is further configured to receive the demodulated signal sent by the shaping module, decode the demodulated signal, and obtain information in the signal to be demodulated. The information includes instruction information and the transmission rate of the signal to be demodulated.

As shown in fig. 2, an embodiment of the present disclosure provides a first method for demodulation, including:

in step S101, the demodulation device acquires a transmission signal.

Step S102, the demodulation device obtains the transmission rate of the signal to be demodulated according to the transmission signal.

In step S103, the demodulation apparatus receives the signal to be demodulated by using the transmission rate, and inputs the signal to be demodulated into the device for demodulation, so as to obtain a demodulated signal.

By adopting the method for demodulation provided by the embodiment of the disclosure, the demodulation signal is obtained by obtaining the transmission signal, obtaining the transmission rate of the signal to be demodulated according to the transmission signal, then receiving the signal to be demodulated by using the transmission rate, and inputting the signal to be demodulated into the device for demodulation. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, by receiving the signal to be demodulated by using the transmission rate and demodulating the signal to be demodulated, the envelope detection module in the apparatus for demodulation can detect both the TPYE B signal and the VHBR signal, thereby being compatible with the demodulation of the TYPE B signal and the VHBR signal.

Further, the transmission signal is a signal to be demodulated, which is obtained last time by the demodulation device. Further, the transmission rate of the signal to be demodulated, which is obtained by the demodulation device for the first time, is a preset transmission rate threshold. In some embodiments, the transmission rate threshold is 106Kbit/s, 212Kbit/s, 424Kbit/s, 848Kbit/s, 1.7Mbit/s, 3.4Mbit/s, or 6.8Mbit/s.

Further, the method for acquiring the transmission rate of the signal to be demodulated by the demodulation device according to the transmission signal includes: the demodulation device inputs the transmission signal to the means for demodulation and obtains the transmission rate of the signal to be demodulated.

Further, the demodulation device inputs the transmission signal to the means for demodulating, obtains the transmission rate of the demodulated signal, and includes: the demodulation equipment detects the transmission signal by using the configurable envelope detection module to obtain an envelope signal corresponding to the transmission signal. The demodulation device performs waveform conversion on the envelope signal corresponding to the transmission signal by using the envelope signal processing module to obtain a demodulation signal corresponding to the transmission signal. The demodulation device decodes the demodulation signal corresponding to the transmission signal by using the digital control unit module to obtain the information in the transmission signal. The information includes instruction information and the transmission rate of the signal to be demodulated.

Further, the demodulation device inputs a signal to be demodulated into the apparatus for demodulation, including: the demodulation equipment acquires the control word corresponding to the transmission rate by using the digital control unit module. The demodulation equipment utilizes the configurable envelope detection module to adjust the resistance value of the envelope detection circuit according to the control word, and then detects the signal to be demodulated to obtain an envelope signal. The configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable. The demodulation device performs waveform conversion on the envelope signal by using the envelope signal processing module to obtain a demodulation signal. Like this, send the control word that transmission rate corresponds to for configurable envelope detection module according to the transmission rate of waiting to demodulate signal through digital control unit module for configurable envelope detection module adjusts envelope detection circuit's resistance value, makes configurable envelope detection module can detect TPYE B signal and VHBR signal that transmission rate is different, thereby has compatible the demodulation to TYPE B signal and VHBR signal.

Further, the method for acquiring the control word corresponding to the transmission rate by the demodulation device using the digital control unit module includes: the demodulation equipment control digital control unit module utilizes a preset transmission rate control database to perform table look-up operation on the transmission rate to obtain a control word corresponding to the transmission rate; the transmission rate control database stores the corresponding relationship between the transmission rate and the control word. In some embodiments, the control word is a letter or a number.

As shown in fig. 3, an embodiment of the present disclosure provides a second method for demodulation, including:

in step S201, the demodulation apparatus acquires a transmission signal.

Step S202, the demodulation device obtains the transmission rate of the signal to be demodulated according to the transmission signal.

In step S203, the demodulation apparatus receives a signal to be demodulated using the transmission rate.

In step S204, the demodulation device obtains the control word corresponding to the transmission rate by using the digital control unit module.

In step S205, the demodulation device adjusts the resistance value of the envelope detection circuit according to the control word by using the configurable envelope detection module, and then detects the signal to be demodulated to obtain an envelope signal. The configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable.

In step S206, the demodulation device performs waveform conversion on the envelope signal by using the envelope signal processing module to obtain a demodulated signal.

By adopting the method for demodulation provided by the embodiment of the disclosure, the transmission signal is obtained through the demodulation device, and the transmission rate of the signal to be demodulated is obtained according to the transmission signal. And then, a digital control unit module is used for sending a control word corresponding to the transmission rate to a configurable envelope detection module according to the transmission rate of the signal to be demodulated, so that the configurable envelope detection module adjusts the resistance value of an envelope detection circuit, and then the signal to be demodulated is detected to obtain an envelope signal. And then, carrying out waveform conversion on the envelope signal by using an envelope signal processing module to obtain a demodulation signal. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, the resistance value of the envelope detection circuit is adjusted by transmitting a control word according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible.

Further, the signal to be demodulated is a TYPE B signal or a VHBR super-baud rate signal.

Further, the envelope signal is a sinusoidal signal.

Optionally, the demodulating device performs waveform conversion on the envelope signal by using an envelope signal processing module, and includes: the demodulation device amplifies the envelope signal by using the envelope signal processing module to obtain an amplified signal. The demodulation equipment converts the amplified signal into a square wave signal by using an envelope signal processing module to obtain a signal to be shaped. The demodulation equipment shapes the signal to be shaped by using the envelope signal processing module to obtain a demodulation signal.

In some embodiments, the envelope signal processing module comprises an amplifying module, a hysteresis comparison module, and a shaping module. The demodulation device amplifies the envelope signal by using the amplification module to obtain an amplified signal. The demodulation equipment converts the amplified signal into a square wave signal by using a hysteresis comparison module to obtain a signal to be shaped. The demodulation device shapes the signal to be shaped by using the shaping module to obtain a demodulation signal. The amplifying module is a fully differential proportional amplifying circuit. After the envelope signal is amplified by the fully-differential proportional amplifying circuit, a first hysteresis signal and a second hysteresis signal are output. The first hysteresis signal and the second hysteresis signal are differential signals. Thus, since both the TYPE B signal and the VHBR signal are modulated by 10% ASK, the modulation amplitude is shallow. After the envelope signal can be amplified through the fully differential proportional amplifying circuit, the conversion of subsequent waveforms is facilitated. And high-power consumption and high-precision ADC equipment is not needed, so that the power consumption is reduced. Meanwhile, compared with the single-ended proportional amplifying circuit for amplifying the envelope signal, the fully differential proportional amplifying circuit is used for amplifying the envelope signal. The influence of noise and direct current offset can be better inhibited, the performance requirement of the hysteresis comparison module is reduced, and the cost is lower.

Optionally, the amplified signal comprises a first lag signal and a second lag signal; the demodulation equipment converts the amplified signal into a square wave signal by using an envelope signal processing module to obtain a signal to be shaped, and comprises the following steps: the demodulation device acquires a difference signal between the first and second lag signals using the envelope signal processing module. And the demodulation equipment compares the difference signal with a preset reference signal by using the envelope signal processing module to obtain a comparison result. And the demodulation equipment acquires the signal to be shaped according to the comparison result by using the envelope signal processing module. Therefore, the difference signal between the first hysteresis signal and the second hysteresis signal is compared with the preset reference signal through the hysteresis comparison module to obtain the comparison result, and the signal to be shaped is obtained according to the comparison result, so that the demodulation error problem caused by noise can be reduced, and the working stability of the system is improved.

Further, the method for acquiring the signal to be shaped by the demodulation device according to the comparison result by using the envelope signal processing module includes: and under the condition that the value of the difference signal is smaller than that of the reference signal, the demodulation equipment utilizes the envelope signal processing module to determine a preset first voltage value as the value of the signal to be shaped. In the case where the value of the difference signal is greater than the value of the reference signal, the demodulation device determines a preset second voltage value as the value of the signal to be shaped using the envelope signal processing module. When the first voltage value is a high level voltage value, the second voltage value is a low level voltage value. When the first voltage value is a low level voltage value, the second voltage value is a high level voltage value.

Further, the demodulation device shapes the signal to be shaped by using the envelope signal processing module, and includes: the demodulation device performs level conversion on the signal to be shaped by using the envelope signal processing module. And the demodulation equipment shapes the signal subjected to level conversion by using the envelope signal processing module to obtain a demodulated signal.

Further, after the demodulation device performs waveform conversion on the envelope signal by using the envelope signal processing module to obtain a demodulated signal, the method further includes: the demodulation device utilizes the digital control unit module to decode the demodulation signal and obtain the information in the signal to be demodulated.

With reference to fig. 4, a third method for demodulation is provided in the embodiments of the present disclosure, including:

in step S301, the demodulation apparatus acquires a transmission signal.

Step S302, the demodulation device obtains the transmission rate of the signal to be demodulated according to the transmission signal.

In step S303, the demodulation device receives a signal to be demodulated using the transmission rate.

In step S304, the demodulation device uses the digital control unit module to obtain the control word corresponding to the transmission rate.

Step S305, the demodulation device utilizes a configurable envelope detection module to adjust the resistance value of an envelope detection circuit according to the control word, and then detects a signal to be demodulated to obtain an envelope signal; the configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable.

In step S306, the demodulation device amplifies the envelope signal by using the amplification module to obtain an amplified signal.

In step S307, the demodulation device converts the amplified signal into a square wave signal by using the hysteresis comparison module, so as to obtain a signal to be shaped.

Step S308, the demodulation device shapes the signal to be shaped by using the shaping module to obtain a demodulated signal.

In step S309, the demodulation apparatus decodes the demodulated signal using the digital control unit module.

By adopting the method for demodulation provided by the embodiment of the disclosure, the demodulation device sends the control word corresponding to the transmission rate to the envelope detection circuit by using the digital control unit module according to the transmission rate of the signal to be demodulated, so that the envelope detection circuit adjusts the resistance value, and then detects the signal to be demodulated to obtain the envelope signal. The envelope signal is then amplified by a fully differential proportional amplification circuit. The hysteresis comparison circuit converts the single-shot signal into a square wave signal to obtain a signal to be shaped. And then shaping the signal to be shaped by utilizing a shaping circuit. And inputting the shaped signal into a digital control unit module to decode the demodulated signal. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, the resistance value of the envelope detection circuit is adjusted by transmitting a control word according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible.

As shown in fig. 5, an embodiment of the present disclosure provides a system for demodulation, including: a PCD (program recording device) device and a demodulation device 9. The PCD device is a card machine device 4. The card reader device 4 and the demodulation device 9 perform signal transmission through an antenna. Wherein the demodulation device 9 includes: the circuit comprises an envelope detection circuit 5, a digital control unit module 1, a fully differential proportional amplification circuit 6, a hysteresis comparison circuit 7 and a shaping circuit 8. The envelope detection circuit 5 and the digital control unit module 1 are both connected with the card machine device 4. The digital control unit module 1 is connected to an envelope detection circuit 5. The envelope detection circuit 5 is connected to the fully-differential proportional amplifier circuit 6, and the fully-differential proportional amplifier circuit 6 is connected to the hysteresis comparator circuit 7. The hysteresis comparator circuit 7 is connected to the shaping circuit 8. The shaping circuit 8 is connected with the digital control unit module 1. The resistance value of the envelope detection circuit 5 is adjustable. The card machine equipment is used for sending the signal to be demodulated to the demodulation equipment through the antenna. The digital control unit module 1 is used for acquiring the transmission rate of a signal to be demodulated; acquiring a control word corresponding to a transmission rate; sending the control word to an envelope detection circuit, and triggering the envelope detection circuit to adjust the resistance value according to the control word; and receiving the demodulation signal sent by the shaping circuit and decoding the demodulation signal. The envelope detection circuit 5 is used for receiving a signal to be demodulated and a control word sent by the digital control unit module; adjusting the resistance value according to the control word, and then detecting a signal to be demodulated to obtain an envelope signal; the envelope signal is sent to a differential proportional amplification circuit. The fully-differential proportional amplifying circuit 6 is used for acquiring an envelope signal sent by the envelope detection circuit, amplifying the envelope signal and acquiring a first hysteresis signal and a second hysteresis signal; and sending the first hysteresis signal and the second hysteresis signal to a hysteresis comparison module, and triggering the hysteresis comparison module to convert the first hysteresis signal and the second hysteresis signal into square waves to obtain signals to be shaped. The hysteresis comparison circuit 7 is used for receiving the amplified signal sent by the fully differential proportional amplifying circuit; converting the amplified signal into a square wave signal to obtain a signal to be shaped; and sending the signal to be shaped to a shaping circuit, and triggering the shaping circuit to shape the signal to be shaped. The shaping circuit is used for receiving a signal to be shaped sent by the hysteresis comparison circuit; and shaping the signal to be shaped to obtain a demodulated signal. And sending the demodulation signal to a digital control unit module, and triggering the digital control unit module to decode the demodulation signal.

In some embodiments, the demodulation device is a PICC (Proximity card or object) demodulation device.

By adopting the system for demodulation provided by the embodiment of the disclosure, the demodulation device sends the control word corresponding to the transmission rate to the envelope detection circuit by using the digital control unit module according to the transmission rate of the signal to be demodulated, so that the envelope detection circuit adjusts the resistance value, and then detects the signal to be demodulated to obtain the envelope signal. The envelope signal is then amplified by a fully differential proportional amplification circuit. The hysteresis comparison circuit converts the single-shot signal into a square wave signal to obtain a signal to be shaped. And then shaping the signal to be shaped by using a shaping circuit. And inputting the shaped signal into a digital control unit module to decode the demodulated signal. In this way, since the transmission rates of the TPYE B signal and the VHBR signal are different, the resistance value of the envelope detection circuit is adjusted by transmitting a control word according to the transmission rate of the signal to be demodulated by using the digital control unit module. The envelope detection module can detect TPYE B signals and VHBR signals, and therefore demodulation of TYPE B signals and VHBR signals is compatible. Meanwhile, the device has a simple structure, is easy to integrate, has higher area utilization rate of the chip, and reduces the cost.

Further, the configurable envelope detection module obtains the transmission rate of the signal to be demodulated by the following method: the demodulation equipment detects the transmission signal by using the configurable envelope detection module to obtain an envelope signal corresponding to the transmission signal. The demodulation device performs waveform conversion on the envelope signal corresponding to the transmission signal by using the envelope signal processing module to obtain a demodulation signal corresponding to the transmission signal. The demodulation device decodes the demodulation signal corresponding to the transmission signal by using the digital control unit module to obtain the information in the transmission signal. The information includes instruction information and the transmission rate of the signal to be demodulated. The transmission signal is a signal to be demodulated which is obtained last time by the demodulation device. The transmission rate of the transmission signal is a preset transmission rate threshold.

In some embodiments, the card reader device sends the first signal to be demodulated to the PICC demodulation device. The transmission rate of the first signal to be demodulated is a preset transmission rate threshold value. The PICC demodulation device receives the first signal to be demodulated. And detecting the first signal to be demodulated by using a configurable envelope detection module to obtain a first envelope signal corresponding to the first signal to be demodulated. The demodulation device performs waveform conversion on the first envelope signal by using the envelope signal processing module to obtain a first demodulation signal corresponding to the first signal to be demodulated. The demodulation device decodes the first demodulation signal corresponding to the transmission signal by using the digital control unit module to obtain information in the first signal to be demodulated. At this time, the information includes the envelope instruction information. Under the condition that the card reader equipment needs to send a second signal to be demodulated, the card reader equipment adds a rate signal into the first signal to be demodulated. The rate signal is used to characterize the transmission rate of the second signal to be demodulated. And the first signal to be demodulated added with the rate signal is still sent to the PICC demodulation equipment at a preset transmission rate threshold value. The PICC demodulation device detects, converts and decodes the first signal to be demodulated, to which the rate signal is added, and obtains information in the first signal to be demodulated. At this time, the information includes the transmission rate of the second signal to be demodulated and the instruction information. The PICC demodulation device receives the second signal to be demodulated using the transmission rate of the second signal to be demodulated. And the second signal to be demodulated is input to the means for demodulating to obtain a demodulated signal. In the case of receiving the second signal to be demodulated, the transmission signal is the first signal to be demodulated to which the rate signal is added.

As shown in fig. 6, an embodiment of the present disclosure provides a demodulation apparatus, which includes a processor (processor) 10 and a memory (memory) 11. Optionally, the apparatus may further include a Communication Interface (Communication Interface) 12 and a bus 13. The processor 10, the communication interface 12 and the memory 11 may communicate with each other through a bus 13. The communication interface 102 may be used for information transfer. The processor 10 may call logic instructions in the memory 11 to perform the method for demodulation of the above embodiment.

In addition, the logic instructions in the memory 11 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 11 is a computer-readable storage medium and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 10 executes functional applications and data processing, i.e. implements the method for demodulation in the above embodiments, by executing program instructions/modules stored in the memory 11.

The memory 11 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 11 may include a high-speed random access memory, and may also include a nonvolatile memory.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and illustrated in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. An apparatus for demodulation, comprising:

the digital control unit module is sequentially connected with the configurable envelope detection module and the envelope signal processing module; the configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable; the digital control unit module is used for acquiring the transmission rate of a signal to be demodulated; acquiring a control word corresponding to the transmission rate; sending the control word to a configurable envelope detection module, and triggering the configurable envelope detection module to adjust the resistance value of the envelope detection circuit according to the control word;

the configurable envelope detection module is connected with the digital control unit module; the configurable envelope detection module is used for acquiring the signal to be demodulated and the control word sent by the digital control unit module; adjusting the resistance value of the envelope detection circuit according to the control word, and then detecting the signal to be demodulated to obtain an envelope signal; sending the envelope signal to an envelope signal processing module;

the envelope signal processing module is connected with the configurable envelope detection module; the envelope signal processing module is used for receiving the envelope signal sent by the configurable envelope detection module; and carrying out waveform conversion on the envelope signal to obtain a demodulation signal.

2. The apparatus of claim 1, wherein the envelope signal processing module comprises:

the amplification module is sequentially connected with the hysteresis comparison module and the shaping module; the amplifying module is used for acquiring an envelope signal and amplifying the envelope signal to obtain an amplified signal; sending the amplified signal to a hysteresis comparison module, and triggering the hysteresis comparison module to convert the amplified signal into a square wave to obtain a signal to be shaped;

the hysteresis comparison module is connected with the amplification module; the hysteresis comparison module is used for receiving the amplified signal sent by the amplification module; converting the amplified signal into a square wave signal to obtain a signal to be shaped; sending the signal to be shaped to a shaping module, and triggering the shaping module to shape the signal to be shaped;

the shaping module is connected with the hysteresis comparison module; the shaping module is used for receiving a signal to be shaped sent by the hysteresis comparison module; and shaping the signal to be shaped to obtain a demodulation signal.

3. The apparatus of claim 1, wherein the signal to be demodulated is a TYPE B signal or a VHBR ultra-high baud rate signal.

4. The apparatus of claim 2, wherein the amplified signal comprises a first hysteresis signal and a second hysteresis signal; and the first hysteresis signal and the second hysteresis signal are differential signals.

5. The apparatus of claim 1, wherein the envelope signal is a sinusoidal signal.

6. A method for demodulation, comprising:

acquiring a transmission signal;

acquiring the transmission rate of a signal to be demodulated according to the transmission signal;

receiving a signal to be demodulated using the transmission rate, and inputting the signal to be demodulated into the apparatus for demodulation of claim 1, to obtain a demodulated signal.

7. The method according to claim 6, wherein inputting the signal to be demodulated into the apparatus for demodulation according to claim 1 comprises:

acquiring a control word corresponding to the transmission rate by using a digital control unit module;

adjusting the resistance value of an envelope detection circuit by using a configurable envelope detection module according to the control word, and then detecting the signal to be demodulated to obtain an envelope signal; the configurable envelope detection module comprises an envelope detection circuit; the resistance value of the envelope detection circuit is adjustable;

and performing waveform conversion on the envelope signal by using the envelope signal processing module to obtain a demodulation signal.

8. The method of claim 7, wherein performing a waveform conversion on the envelope signal using the envelope signal processing module comprises:

amplifying the envelope signal by using the envelope signal processing module to obtain an amplified signal;

converting the amplified signal into a square wave signal by using the envelope signal processing module to obtain a signal to be shaped;

and shaping the signal to be shaped by using the envelope signal processing module to obtain a demodulated signal.

9. The method of claim 8, wherein the amplified signal comprises a first lag signal and a second lag signal; converting the amplified signal into a square wave signal by using the envelope signal processing module to obtain a signal to be shaped, comprising:

acquiring a difference signal between the first lag signal and the second lag signal by using the envelope signal processing module;

comparing the difference signal with a preset reference signal by using the envelope signal processing module to obtain a comparison result;

and acquiring the signal to be shaped according to the comparison result by utilizing the envelope signal processing module.

10. A demodulation apparatus comprising a processor and a memory storing program instructions, characterized in that the processor is configured to perform the method for demodulation according to any of claims 6 to 9 when executing the program instructions.