FR2888974A1 - RADIOFREQUENCY COMMUNICATION METHOD AND SYSTEM WITH AN ELECTRONIC ELECTRONIC CONTACTS MODULE, MODULE AND DEVICE THEREOF - Google Patents

Abstract

The invention relates to a method for communicating radio frequency signals with an electronic module with electrical contacts (2) having a contact (14) assigned to a DC supply voltage Vcc, and at least one contact assigned to a radiofrequency communication interface, said method comprising at least one step of receiving and processing radio frequency signals to deliver information to the electronic module; the method is distinguished by steps of: - generating a modulated electrical signal comprising said information during the processing of radio frequency signals, - Communication of information to the module (2) via the voltage supply contact (14) by superimposing the modulated electrical signal to said supply voltage. The invention also relates to the radio frequency communication system, the module and the device associated.

Description

Radiofrequency communication method and system with a module

  electronics with electrical contacts, module and associated device.

  The invention relates to a method and a system for radiofrequency signal communication with an electronic module with electrical contacts having a contact assigned to a DC supply voltage, and at least one contact assigned to a radiofrequency communication interface.

  It also relates to a device for radiofrequency communication with an electronic module provided for this purpose, such as a SIM subscriber identification chip card or universal SIM card (USIM).

  The use of a SIM chip card in a radio frequency communication system is very restrictive with regard to the assignment and number of external electrical contacts. The current standards in force define only eight electrical contacts, five of which are already assigned to the ISO 7816 protocol and can not be modified for compatibility with the existing one.

  In addition, the standard for UICCs (also known as SIM cards) is currently being significantly modified by the addition of a new high-speed communication interface. throughput to improve communication speed and diversify applications.

  So there are currently discussions in the industry to allocate the remaining three contacts for the two new types of connections: a connection for a broadband interface and a radio frequency interface connection in the mobile phone that would be used for non-contact type, for example using an NFC type radio frequency chip (acronym for the English expression "Near Field Communication").

  This high-speed interface will initially be arranged next to the existing ISO 7816 connections for compatibility reasons and will allow a flexible migration of UICC functions from the ISO-based APDU protocol to this new interface. high speed using eg TCP / IP and ETHERNET protocols.

  For the high-speed protocol, the MMC (Multimedia Card) specification protocol requires at least the three available electrical contacts (CLK, CMD and DAT) and in this case, there is no need for it. has more electrical contact available for the radio frequency connection.

  Among other technical possibilities, it has also been mentioned in the industry to perform a contactless communication using only one of the three residual contacts so as to enable USB-type broadband communication (acronym for the Anglo-Saxon term "Universal Serial Bus").

  This solution seems to have the disadvantage of requiring a communication protocol without contact particular and additional to existing ones and impose USB as high-speed technology.

  On the other hand, there are also operating requirements as well as requirements of the standards for connecting the UICC to a radio frequency communication interface RF placed in the telephone and presented below.

  Regarding the operation, in contactless, when the battery of the phone is low, it is strongly required to continue to make some transactions by using the residual energy of the battery, for example to leave an underground means of transport.

  Regarding standards, the typical example of a contactless high-speed interface is an NFC chip compatible with ECMA 340 and ISO / IEC 18092. Radio frequency communication interfaces must also be compatible with existing standards such as ISO / IEC 14443 or ISO / IEC 15693.

  The invention aims to solve the disadvantages and / or satisfy the above requirements.

  The invention also aims, in particular within the framework of ISO 7816, to allow radio frequency communication with a device with electrical contacts and to allow free use of the residual electrical contacts for high speed, in particular of the MMC type. or USB.

  The invention consists in its principle of using the voltage supply signal of an electronic module with electrical contacts, to convey a radiofrequency origin signal and energy, which has the advantage of not monopolizing any of the three residual electrical contacts.

  Considering that the RF interface must be able to power the UICC card and that a connection for a dual power supply is not easy to manage in an integrated circuit chip, the basic idea is to connect the power supply pad from the UICC to the RF interface and to share this pad between power supply and communication.

  For this purpose, the subject of the invention is a method for communicating radio frequency signals with an electronic module with electrical contacts having a contact assigned to a DC supply voltage Vcc, and at least one contact assigned to a radio frequency communication interface, said method comprising at least one step of receiving and processing radio frequency signals for delivering information to the electronic module.

  The method is characterized in that it comprises the following steps of generating a modulated electrical signal comprising said information during the processing of radio frequency signals and communicating information to the module via the voltage supply contact by superimposing the signal electrical modulated to said supply voltage.

  According to other implementation features, the method comprises: a step of processing modulated electrical signals received on the supply contact, in which an electrical signal demodulation operation is performed to convert the modulated electrical signals into data; digital information to be managed by the processor M of the module; - The modulated electrical signal is such that the voltage resulting from the superposition remains confined within min / max limits imposed by a standard relating to voltage supply tolerances of the module with electrical contacts.

  The invention also relates to a radiofrequency signal communication system comprising: an electronic module with electrical contacts having a contact assigned to a DC supply voltage, and at least one contact assigned to a radio frequency communication interface; radio frequency communication comprising means for receiving and processing radiofrequency signals for delivering information to the electronic module.

  The system is characterized in that the radiofrequency communication interface comprises at least means for receiving and processing radio frequency signals for generating a modulated electrical signal comprising said information and for communicating said information to the module via the voltage supply contact. superimposing the modulated electrical signal at said supply voltage.

  According to other embodiments of the system: the electronic module further comprises modulated electrical signal processing means received on the voltage supply contact, said means being able at least to demodulate the electrical signals to convert them into digital data / information to be managed by the processor M of the module; the means for processing or generating the modulated electrical signal are capable of calibrating this signal so that the voltage resulting from the superposition remains confined within min / max limits imposed by a standard relating to voltage supply tolerances of the module with electrical contacts; the means for processing the radio frequency signals comprise at least one conversion module making it possible to transcribe a radiofrequency signal into a modulated signal; the means for processing radio frequency signals comprise a block / unit for converting and / or managing radio frequency signal protocols; the means for processing the modulated electrical signal comprise a demodulator and transmission means connected to the processor of the module; - The electronic module of the system comprises modulated electrical signal processing means which have a modulation function for returning signals modulated from digital signals to the radio frequency interface via said power pad; the interface with electrical contacts is an ISO 7816 interface, and the contacts are connected to a high-speed communication interface (MMC, USB); the system comprises a telephony device comprising a SIM card, a high-speed communication interface and a radio frequency communication interface.

  The invention also relates to an electronic module comprising a processor M, a communication interface with electrical contacts comprising a DC voltage supply pad.

  The module is distinguished in that it further comprises means for processing modulated electrical signals received on the voltage supply contact, said means being able at least to demodulate the electrical signals to convert them into data / digital information.

  According to one embodiment, the electronic module constitutes a subscriber identification card (SIM).

  The invention also relates to an electronic radiofrequency communication device comprising an electrical contact communication interface and a radio frequency communication interface, said electrical contact interface comprising electrical connectors for connecting an electronic chip module, one of the connectors delivering a DC supply voltage Vcc, and at least one RF connector being connected to the radio frequency communication interface; It is distinguished in that the radiofrequency communication interface 20 comprises at least means for receiving and processing radiofrequency signals able to: - generate a modulated electrical signal comprising said information from the received radio frequency signals, - communicate said information on the same connector as the power connector by superimposing the generated modulated electrical signal at said supply voltage.

  According to other embodiments of the invention, the device: constitutes a mobile telephone apparatus having a contact communication interface according to one of the standards of ISO 7816; comprises means of high-speed communications (MMC, USB), said means being connected to certain connectors RA, RB, RC said high-speed communication interface with electrical contacts ISO 7816; comprises a processor processing unit delivering a voltage Vcc to a connector, and the radiofrequency communication interface receives and manages this voltage.

  In addition, the radiofrequency communication interface of the device receives and manages all available energy sources for the electronic module.

  Other features and advantages of the invention will appear on reading the description given by way of nonlimiting example and with reference to the appended drawings in which: FIG. 1 illustrates an embodiment of an architecture of a communication system according to the invention in the form of a telephone and smart card SIM, in connection with a radiofrequency terminal; FIG. 2 illustrates a detailed embodiment of an architecture of the NFC communication processing means of FIG. 1; FIG. 3 illustrates an embodiment of the modulated signal processing means to be added in a SIM card of FIG. 1.

  In FIG. 1, a radiofrequency signal communication system 1 comprises at least one electronic module 2 with electrical contacts such as a SIM card, in communication relation with a mobile telecommunication device 3.

  The mobile device 3 may be any other device / electronic communication device such as a personal assistant, PDA, laptop etc. equipped with one or more communication or telecommunication interfaces of different known types.

  The mobile 3 conventionally comprises an electronic processing unit 5 with a processor 4 (called a tape base) intended to manage the telephone and the possible peripherals, in particular the SIM card (2), the GSM application relating in particular to the identification to the telephone network and / or other possible applications, such as a remote reloading application or other.

  The connections CLK, RST, GND, I / O of the basic electronic unit 5 are conventionally carried out on the corresponding electrical contacts of the UICC, SIM or (U) SIM mini-card in accordance with an ISO 7816 standard, for example via an 8-pin connector block placed in the mobile device and corresponding to the electrical contact areas of the SIM card.

  One of the eight specific electrical contacts 14 is therefore assigned to a DC supply voltage in accordance with ISO 7816, while for receiving and / or transmitting data from or to a radio frequency message transmitter / receiver, an input / output electrical contact must be reserved and connect an external radiofrequency communication interface to the module as will be seen later.

  The telephone 3 may also comprise a second processor unit, called application processor 5, connected to the previous unit 4 and various interfaces and / or peripherals via a communication connection 6. This unit 5 is intended to manage or control a possible application (contactless application, USB, MMC) allowed by each device or radio frequency communication interface 7 or high-speed interface including USB or MMC mobile.

  It is normally possible to connect one of the two high-speed USB, MMC type interfaces to the three residual electrical contacts A, B, C. An exchange of data or control instructions of the unit 5 is provided by connections 8 and 9.

  The mobile 3 further comprises means for receiving and processing radio frequency signals 7 constituted in the example by a radio frequency communication interface, of the NFC type, comprising an RF antenna coil 11 and at least specific means 12 for converting radio frequency signals. radiofrequency signals described in more detail later.

  These means 7 for receiving and processing RF signals are controlled by the electronic application unit 5 and connected to a mobile power source, in particular an available battery 10 and / or the electrical contact VCC of the unit 4 via the 10C connection.

  The radio frequency communication interface 7 is designed to deliver to the electronic module information received using the RF antenna by appropriate connections described below.

  The internal mobile phone architecture according to one embodiment comprises the modifications hereafter. The radio frequency communication interface 7 comprises specific means 12 for processing radiofrequency signals.

  These means 12 are designed so as, on the one hand, to generate a modulated electrical signal comprising said information, from the radiofrequency or radio-frequency type signals picked up on the RF antenna coil, on the other hand, to communicate said information to the module via its voltage supply contact 14 VCC via an electrical connection 16.

  According to one characteristic of the embodiment, whatever the origin of the power source used by the electronic module 2 (battery, RF field, telephone unit 4), this source is controlled by the radiofrequency processing means 7, in particular using a power source manager 25, which delivers the required voltage to a single connector 14C. This manager will be described in more detail in connection with Figure 2.

  This connector is intended to connect a single electrical voltage supply contact 14 of the electronic module 2. This constitutes a considerable simplification of the supply of the electronic module 2.

  According to the embodiment of the invention, the modulated electrical signal is superimposed on a supply voltage VCC of the module coming from the processing means 12 and supplying the electronic module 2 via the same link 16.

  Thus, thanks to the invention, it is possible to perform the connection of a UICC card to a radio frequency interface via the power supply pad VCC of the card, the supply voltage being modulated.

  Preferably, the means 17 for processing and generating the modulated electrical signal are advantageously capable of calibrating this signal, in particular so as to obtain a voltage resulting from the superposition which remains confined within defined minimum / maximum limits; limits in this case imposed by a standard relating to voltage supply tolerances of the module with electrical contacts.

  Indeed, if we consider the ETSI- (TS 102 221) for power supply (Vcc) on UICC cards, we find that 3 classes A to c are defined by a mean voltage with maximum and minimum limits according to the table below.

  Class Minimum Maximum Unit A 4.5 5.5 Volt B 2.7 3.3 Volt C 1.62 1.98 Volt To the extent that there is no description of the power signal between maximum and minimum limits, an idea of the inventor was to use these allowed tolerances for the VCC supply to superimpose on the DC power supply voltage, a modulated signal to communicate with the UICC card.

  For example, when the IS01443 RF interface is in use, it is possible, in accordance with this preferred mode, to add a carrier frequency of 13.56 MHZ and amplitude of 100 mV to the DC voltage supply signal while remaining in accordance with ETSI Class A specifications.

  This solution makes it possible to have a radiofrequency signal associated with the VCC signal on the same contact without unduly disturbing the level of voltage required for the integrated circuit chip. In addition, this embodiment is advantageous in that no electronic means for regulating the voltage is required in the module chip downstream of the supply contact.

  The device comprises, for example in the means 12, an adder circuit element S carrying out the superimposition of the two direct and modulated alternating voltage voltages for supplying the power supply and a communication signal to the electronic module 2.

  This adder circuit element S can be simply formed so as to physically join the two connections coming respectively from the manager 25 and the modulator / demodulator means 21, 21i.

  This element can also perform a processing of the two signals so as to generate a regulated voltage, calibrated within the voltage limits of the standard while having an AC component for the modulated signal.

  According to a variant, this element S may possibly be part of the energy manager 25.

  If necessary, the carrier frequency at 13.56 MHz may be used by the UICC as a clock signal instead of or in the absence of that provided by the mobile.

  To communicate data to the UICC card, the RF interface may employ any known modulation technique such as amplitude modulation, frequency modulation, or phase modulation.

  Different known ways of coding the data, information, with the associated protocol can be used by those skilled in the art.

  Conversely, the UICC card can communicate with the RF interface by impedance modulation on the carrier frequency present on the electrical contact 14. The impedance variation is seen and translated by the means 12, in particular the demodulator 21 i to deliver a digital signal at its output.

  Another way of realizing the function of the element 32 is to create a carrier frequency different from the previous one, for example by being twice that of the latter and of modulating it according to the data to be transmitted.

  The following is the radiofrequency electronic communication device 3, excluding electronic module, mainly in the aspect of its connectors; The device comprises at least one communication interface with electrical contacts and a radio frequency communication interface 7.

  The electrical contact interface includes electrical connectors for connecting an electronic chip module; one of the connectors (14C) delivers a DC supply voltage, and according to the invention, this same connector is connected to the radio frequency communication interface for receiving radio frequency type messages.

  The radiofrequency communication interface 7, 11 comprises, as before, the means for receiving and processing radiofrequency signals; these means are able to communicate the information on the same connector 14C as the power connector by superimposing where appropriate the generated modulated electrical signal, said supply voltage.

  In the case where the electronic device comprises high-speed communication means (MMC, USB) controlled in particular by the application processor 5, these means would be with some residual connectors RA, RB, RC said of high-speed of the communication interface with ISO 7816 electrical contacts of the device.

  According to a simplified variant, the contact interface of the device could be summarized as a connector for the power supply of the module; this connector would be connected to the radiofrequency communication interface 7.

  FIG. 2 illustrates a detailed embodiment of the means (7, 12) for receiving and processing RF radio signals according to the invention for an application using the ISO1443 protocol.

  These processing means (7, 12) mainly comprise a conversion module 20, 21, for transcribing a radio frequency signal into a modulated signal.

  The conversion module comprises a conversion unit / unit formed of a demodulator 20 arranged at the output of a signal amplifier 22, which can be connected to a module or block 23 for contactless protocol management or radio frequency signals and / or management of a protocol or anti-collision application. This management module 23 is controlled by the mobile application processing unit 5 as indicated above.

  The management block 23 may take into account a contactless initialization procedure such as anti-collision and low-level data formatting.

  At the upper output of these management block 23 is the signal modulator 21 destined for the mini-UICC. This modulator makes it possible to deliver a signal modulated on the carrier frequency in particular at 13.56 MHz on the power contact 14, while respecting the amplitude level according to the class chosen A, B, C of the table above; in this case in the example, the amplitude is 100 mV.

  The processing means 7 comprise at least one inverse conversion module 21i (performing an inverse conversion to the conversion module 21) for transcribing a modulated signal received on the supply contact 14 into a radio frequency signal.

  For this purpose, the conversion module comprises at least one modulated electrical signal demodulator 21i originating from the UICC card which is connected to an impedance modulator 20i for RF signals, via the protocol manager 23.

  A conventional impedance matching interface 24 is disposed between the antenna 11 and these conversion modules.

  The processing means preferably also include a power management module 25 connected between the impedance matching interface 24 and the voltage supply contact 14; it is also connected to the mobile battery via the mobile Vcc link and can also receive power from the mobile VCC connector via the connection 10C. This power management module 25 makes it possible to recover energy from either the battery or radiofrequency energy picked up by the antenna coil and may include a voltage regulator for this purpose.

  Consequently, the processing means 7 can be designed to deliver the power supply of the UICC card. This power supply can come from, for example, the main battery of the phone during normal operation, the RF field when the battery is completely disconnected or a mixture of both when the energy remaining in the battery of the phone does not. is not sufficient for normal operation but is enough for a very short transaction of uncontact type.

  Thus, thanks to the invention, the system has an architecture in which the radiofrequency interface (7) can manage the power source of the IUCC card and in particular provide a regulated voltage within certain limits.

  According to an alternative embodiment, the processing means 7 may also be designed so as to perform a total or partial RF treatment or even be transparent. In the latter case, the processing means 7 may not include the block 23 and only perform the following functions: demodulation and modulation of the RF signal, modulation and demodulation of the modulated electrical signal transmitted on the voltage supply to the U ICC card.

  The above functions in the processing means 7 may simply comprise a transcription or conversion of the signal received on the antenna 11 into a modulated electrical signal to be connected to the supply voltage of the module 2; they may comprise the opposite, that is to say a transcription of a modulated signal received on the supply pad 14C from the card into a radiofrequency signal transmitted by the antenna 11.

  The transcription of the signal can be direct in both directions (radio frequency signals / modulated electrical signals) or go through a digital form for possible intermediate processing (radio frequency signals / digital signals / modulated electrical signals).

  The RF processing means 7 may also include a specific interface for the telephone processor's application unit so as to directly use the RF interface for its own account.

  FIG. 3 represents an embodiment of the invention in the UICC card (2). Compared to UICC of the prior art, the invention adds at least one demodulator 30 and modulator 32 which respectively process the modulated signal from the feed pad 14C or the digital signal from the processor M and going to the pad 14C.

  The SIM module comprises, according to the invention, modulated electrical signal processing means 26 which are connected to the electrical contact 14 via a capacitive filter 29. These means 26 have at least the function of demodulating the signals received on the power supply contact so as to convert them into digital data to be managed by the module processor.

  For this purpose, the processing means 26 of the modulated electrical signal comprise a demodulator 30 and a receiver unit 31 (UART) connected to the processor M of the module.

  The processing means 26 of modulated electrical signals also have a function, inverse to the previous one, for modulating the digital signals using a modulator 32 and for returning modulated signals from digital signals originating from a digital signal. transmitter block 33 (UART) connected to the processor M of the IUCC module, to the radiofrequency interface via said power supply pad.

  According to one embodiment of the system of the invention, the three residual electrical contacts A, B, C are all preferably connected to a high-speed communication interface of the MMC type.

  The operation of the system will be explained in connection with process steps and with the aid of FIG.

  The mobile, provided with its NFC interface and electronic module adapted above, is used to perform an RF transaction with an access control radio frequency terminal 40 provided with a coil 41 and operating on a frequency 13.56 MHz.

  The transmitting field H of the base station transmits interrogation information contained in radiofrequency signals of the electromagnetic field generated by it. These signals are picked up, received by the antenna coil of the mobile 11 and extracted by the RF interface 24 and transmitted to the NFC processing means 12 to deliver information to the UICC card.

  More particularly, the radiofrequency signal extracted from the RF interface is amplified by the amplifier 22 and then demodulated by the demodulator 20 before entering the digital form, if any, into the RF signal manager 23 where an anticollision treatment can be done if necessary.

  It is also possible to perform any other signal processing or to perform part of an application normally contained in the UICC card.

  Then, the digital signals are submitted to the modulator 21 to generate a modulated and calibrated electrical signal comprising said information to the UICC card. The signal is kept within the minimum / maximum limits referred to above.

  The modulated electrical signal is then communicated to the module via the voltage supply contact via the electrical connection 14C.

  When, the energy level is insufficient, a subset of the RF processing means can extract complementary or total energy from the magnetic field from the access terminal.

  This supply voltage is then simply superimposed on the electrical signal modulated with the aid of the voltage adder S. The adder S adds the voltage Vcc to the modulated signal, and a modulated, calibrated power supply signal reaches the pad 14 via the plug of the 14C connector.

  This mobile output signal satisfies the power requirements of the chip and is therefore directed directly to the power supply of the processor M in a conventional manner without it being necessary to carry out another calibration or adjustment of the voltage in the chip. .

  A particularly capacitive filter element 29 makes it possible to perceive the AC component of the input supply signal on the pad 14.

  In the next step, on the module side, a modulated electrical signal processing is carried out on the power supply contact, using the demodulator 30 by an operation of demodulation of electrical signals to convert the modulated electrical signals into data / information. digital devices intended to be transmitted via the element 31 and managed by the processor M of the module.

  The SIM card which contains a subway access application, for example, receives, interprets the message and elaborates a response by implementing the application: an electronic right or identifier etc. is then communicated in digital form then transmitted under the control of the card processor to the transmission means 33 and to the modulator 32.

  At the latter, the digital signal is converted into a modulated electrical signal containing the message, of the same amplitude as before and on the same carrier frequency of 13.56 MHz before being subjected to the connector of the mobile 14C via the power contact. 14 of the UICC map.

  The message then passes in the mobile by the processing means 12 of the NFC radio frequency interface including the demodulator 21i, possibly by undergoing management or protocol processing by the protocol management means 23, before attacking the modulator impedance 20i connected to the interface of the antenna.

  The impedance modulator 20i communicates the message by the impedance variations created in the electromagnetic field H of the access terminal 40 and detected by it.

Claims (19)

  A method of communicating radio frequency signals with an electronic module with electrical contacts (2) having a contact (14) assigned to a DC supply voltage Vcc, and at least one contact assigned to a radio frequency communication interface, said method comprising at least one step of receiving and processing radiofrequency signals to deliver information to the electronic module, characterized in that it comprises the following steps: - generation of a modulated electrical signal comprising said information during the processing of radio frequency signals, - communicating information to the module (2) via the voltage supply contact (14) by superimposing the modulated electrical signal at said supply voltage.   2. A method of RF signal communication according to claim 1, characterized in that it comprises: a step of processing modulated electrical signals received on the supply contact (14), in which a demodulation operation is performed; electrical signals for converting the modulated electrical signals into data / digital information to be managed by the processor M of the module.   3. A method for communicating radio frequency signals according to claim 1 or 2, characterized in that the modulated electrical signal is such that the voltage resulting from the superposition remains confined within min / max limits imposed by a standard relating to tolerances of voltage supply of the module with electrical contacts.   A radio frequency signal communication system comprising: an electronic module (2) with electrical contacts having a contact (14) assigned to a DC supply voltage, and at least one contact assigned to a radio frequency communication interface; radio frequency communication interface comprising means for receiving and processing radio frequency signals for delivering information to the electronic module, characterized in that the radiofrequency communication interface (7) comprises at least means (12) for receiving and processing radiofrequency signals to: - generate a modulated electrical signal comprising said information, - communicate said information to the module via the voltage supply contact (14) by superimposing the modulated electrical signal at said supply voltage.   5. Radio frequency signal communication system according to the preceding claim, characterized in that the module (2) further comprises modulated electrical signal processing means (26) received on the voltage supply contact (14), said means (26) being adapted at least to demodulate the electrical signals to convert them into data / digital information to be managed by the processor M of the module.   6. System according to one of claims 4 or 5, characterized in that the means (12) for generating the modulated electrical signal are adapted to calibrate this signal so that the voltage resulting from the superposition remains confined within limits min / maxi imposed by a standard relating to voltage supply tolerances of the module with electrical contacts.   7. System according to one of claims 4 to 6, characterized in that the means (12) for processing the radio frequency signals comprise a conversion module (21) for transcribing a radio frequency signal into a modulated signal.   8. System according to one of claims 4 to 7, characterized in that the means (12) for processing the radio frequency signals comprise a block / unit for converting and / or managing radio frequency signal protocol (23).   9. System according to one of claims 4 to 8, characterized in that the modulated electrical signal processing means comprises a demodulator (30) and transmission means (31) connected to the processor of the module.   10. System according to one of claims 4 to 9, characterized in that the electronic module (2) comprises means (26, 32, 33) of modulated electrical signal processing which have a modulation function for returning signals modulated from digital signals to the radio frequency interface via said power pad.   11. System according to one of claims 4 to 10, characterized in that the interface with electrical contacts is an ISO 7816 interface, and in that contacts are connected to a high-speed communication interface (MMC, USB).   12. System according to one of claims 4 to 10, characterized in that comprises a telephony device comprising a SIM card, a high-speed communication interface and a radio frequency communication interface (7).   13. Electronic module (2) comprising a processor M, a communication interface with electrical contacts comprising a DC voltage supply pad (14), characterized in that it further comprises signal processing means (26). modulated electrical receivers received on the voltage supply contact (14), said means being adapted at least to demodulate the electrical signals to convert them into data / digital information.   14. Electronic module according to the preceding claim, characterized in that it constitutes a subscriber identification card (SIM).   15. An electronic radiofrequency communication device comprising a communication interface with electrical contacts and a radio frequency communication interface, said electrical contact interface comprising electrical connectors for connecting an electronic chip module, one of the connectors (14C) delivering a supply voltage. continuous Vcc, and at least one RF connector being connected to the radiofrequency communication interface (7, 11), characterized in that the radio frequency communication interface (7) comprises at least means (12) for receiving and processing radio frequency signals capable of: - generating a modulated electrical signal comprising said information from the received radio frequency signals, - communicating said information on the same connector (14C) as the supply connector (14C) by superimposing the modulated electrical signal generated at said supply voltage.   18. Electronic radio frequency communication device according to the preceding claim, characterized in that it constitutes a mobile telephony device having a contact communication interface according to one of the standards of ISO 7816.   19. Radio frequency electronic communication device according to the preceding claim, characterized in that it comprises high-speed communication means (MMC, USB), said means being connected to certain connectors RA, RB, RC said high-speed of the ISO 7816 electrical contact communication interface.   18. Radio frequency electronic communication device according to one of claims 15 to 17, comprising a processing unit processor 4, delivering a voltage Vcc to a connector 14C, characterized in that the interface (7) communication radio frequency receives and manages this voltage.   19. Electronic radiofrequency communication device according to the preceding claim, characterized in that the radio frequency communication interface (7) receives and manages all available energy sources for the electronic module.