WO2014056792A1

WO2014056792A1 - Remote control interface for chip card reader

Info

Publication number: WO2014056792A1
Application number: PCT/EP2013/070687
Authority: WO
Inventors: Patrick Will; Pascal Maetz
Original assignee: Thomson Licensing
Priority date: 2012-10-08
Filing date: 2013-10-04
Publication date: 2014-04-17
Also published as: FR2996661A1

Abstract

The invention relates to a wireless communication interface (RF4CE 2) comprising a wireless communication controller (RF4CE CTRL) assembled on a printed circuit (PCB), the printed circuit (PCB) comprising a footprint with several contacts (SC-CONN) and being adapted to insertion into a chip card 10 connector (CONN1), an antenna (RF4CE ANT) being situated at the end of the printed circuit (PCB) opposite the end suitable for insertion into the chip card connector (CONN1); two auxiliary contacts (AUX1, AUX2) of the footprint with several contacts (SC-CONN) being used for transmitting data by the wireless communication interface (RF4CE 2).

Description

REMOTE CONTROL INTERFACE FOR CHIP CARD READER

1. Domain of the invention.

The invention relates to the domain of electrical domestic equipment comprising several wireless communication interfaces and notably to the implementation of two wireless communication interfaces operating in identical transmission frequency bands or in the common part of the transmission frequency bands that partially overlap.

2. Prior Art.

The increasing incorporation of varied functions in electrical home equipment is such that a large number of items of equipment have several wireless communication interfaces. This is the case for audiovisual program receiver-decoder products equipped, for example, with a WIFI communication interface (compatible with the standard IEEE802.1 1 ) for the reception of data which encode audiovisual programs from a nearby transmitter and an interface enabling the use of a remote control, the two interfaces functioning in the same frequency band at 2.4 GHz.

The nearby transmitter broadcasting the data is for example a network gateway, or a related item of equipment, such as another audiovisual program receiver-decoder that has a WIFI transmission-reception module.

Moreover, items of home equipment such as receiver-decoders of audiovisual content for example, are increasingly incorporating a wireless RF4CE communication interface, compatible with standard IEEE 802.15.4, operating in the frequency band at 2.4 GHz used by many WIFI interfaces.

When two interfaces are used in the same item of equipment, operating in the same frequency band, at close frequencies, disturbances can degrade transmission performance or even render data exchange ineffective from time to time.

In the present description, "the implementation of two wireless communication interfaces operating in identical transmission frequency bands" means that the interfaces operate either in the same frequency band, for example, in the case where the two interfaces are identical, or operate in a common part at their respective transmission frequency bands, which partially overlap.

It is also important to note that if degradations in performance can occur when two nearby items of equipment (interfaces) operate in the same frequency band also at close frequencies, and in case of strict equality of carrier frequencies used, transmissions become totally inoperative.

3. Summary of the invention.

Today, audiovisual program receiver-decoders are frequently equipped with a WIFI wireless communication interface and with one or more chip card couplers. On this type of equipment, chip card couplers are commonly intended for a chip card connection aiming to authenticate the user, notably for methods for controlling access to content or services. They can also be intended for electronic payment transactions. It is common to see chip card couplers located on the front face of equipment, in order to facilitate access and the insertion of a card. However, sometimes they are either located on the rear face when insertion and removal of a chip card is rarely required.

The invention enables improvement of the situation, in terms of probability of interference between two interfaces operating in the same frequency band, by proposing a wireless communication interface operating in the same frequency band as the WIFI wireless communication interface, cleverly connected to a chip card coupler and positioned such that the probabilities of interference between the two wireless communication interfaces are reduced considerably.

To do this, the invention relates to an assembled wireless communication interface positioned on a face of the electronic equipment opposite or adjacent to the face bearing (or close to) the WIFI interface (operating around 2.4 GHz). The wireless communication interface can be, for example, an RF4CE interface operating in the frequency band at 2.4 GHz but also relates to any communication interface transmitting in this same band, such as, for example, a second WIFI interface.

It should be noted that WIFI interfaces can operate in the frequency band around 2.4 GHz but also around 5 GHz. However, today, many WIFI interfaces operate in a frequency band around 2.4 GHz. Concerning the position of the interfaces according to the invention, an example can be a configuration including a WIFI interface positioned on the motherboard a few centimetres from the rear face of the equipment and a communication interface RF4CE positioned in the front face on the motherboard few centimetres away maximum from the front face of the equipment. The communication interface is realised on a printed circuit whose forms are compatible with insertion into a chip card connector comprised in the item of electronic equipment, the printed circuit has an RF4CE communication controller and the antenna is realised in the form of a printed circuit track, positioned such that it is situated outside the housing unit of the electronic equipment.

More specifically, the invention relates to a wireless communication interface comprising:

• a wireless communication controller assembled on a printed circuit, the printed circuit comprising a footprint with several contacts and the printed circuit being suitable for insertion into a chip card connector,

• an antenna situated at one end of the printed circuit, the end being opposite the end suitable for insertion into the chip card connector, two auxiliary contacts of the footprint with several contacts being respectively used for transmitting and receiving data by the wireless communication interface. According to an embodiment of the invention, the data transmission frequency is equal to 2.4 GHz.

According to an embodiment of the invention, the interface is compatible with the radio-frequency transmission standard RF4CE 802.15.4.

According to an embodiment of the invention, the footprint with several contacts (or contact pads) of the printed circuit comprises eight contacts. The invention also relates to an electronic device comprising a front face, a rear face, a right side face, a left side face, a motherboard, a first wireless communication interface compatible with a Wifi standard IEEE 802.1 1 and a second wireless communication interface operating at a frequency which is identical to that of the first wireless communication interface;

the first wireless interface is located on a first face of the electronic device,

the second wireless interface is located on a second face of the device and adapted to the connexion of the motherboard via the intermediary of a chip card connector, the second face being opposite the first face and the second wireless interface comprises an antenna outside the electronic device.

According to a variant, the second face, which receives the second wireless face, is adjacent to the first face, which receives the first wireless interface. According to an embodiment of the invention, the electronic device is an audiovisual program receiver-decoder.

According to a variant, the electronic device is a gateway for connection to a local home network also usually called a "box".

The invention also relates to a method for detecting a wireless communication interface in a connector of a chip card coupler of a receiver- decoder comprising the steps of:

- transmitting a chip card initialization sequence, waiting for a response to the initialization sequence in order to determine if a chip card is present in the connector and, in the absence of a response in accordance with the initialization sequence of a chip card transmitted within a first time interval of a first predetermined duration, establishment of a phase of recognition of said wireless communication interface (RF4CE 2).

According to an embodiment of the invention, the phase of recognition of the communication interface comprises:

- a step of transmission of at least a first logical word to the communication interface from a control module of the receiver-decoder;

- a step of waiting, for one second time interval of a second predetermined duration, for a second logical word transmitted by the interface to the control module in response to the first logical word. 4. List of figures.

The invention will be better understood, and other specific features and advantages will emerge upon reading the following description, the description making reference to the annexed drawings wherein :

- Figure 1 shows an audiovisual program receiver-decoder comprising a WIFI communication interface and a communication interface RF4CE according to the preferred embodiment of the invention.

- Figure 2 shows the interface RF4CE means of control and connection of the figure 1 receiver-decoder.

- Figure 3 shows an initialization method of the interface RF4CE inserted into a chip card connector of the figure 1 receiver-decoder.

- Figure 4 shows elements of the interface RF4CE of figure 2.

- Figure 5 shows the interface RF4CE contacts (or contact pads) compatible with insertion into a chip card connector.

5. Detailed description of the embodiments of the invention. In a general but non-restrictive way, the invention relates to a chip card interface of an item of audiovisual program receiver-decoder equipment. The interface enables the coupling of a chip card as well as the connection of a peripheral interface module for connection to a wireless network. Figure 1 represents an STB receiver-decoder equipped with a

WIFI 3 wireless network interface and a wireless communication interface RF4CE 2.

The presence of a chip card coupler comprising the chip card connector CONN1 1 on the front face FP has the advantage of being easily accessible to the user and also enables space to be freed up for different connections traditionally present in the rear face, to respond to aesthetic constraints (notably the presence of many cables or interconnection cords). According to the preferred embodiment of the invention, the WIFI 3 interface is positioned in the rear face RP of the STB receiver- decoder and the communication interface RF4CE 2 is situated on the front face FP of the STB receiver-decoder, thereby ensuring a large distance between the two communication interfaces with respect to the receiver- decoder dimensions. The two interfaces operate in the same frequency band at 2.4 GHz.

According to a variant, the interfaces are situated respectively on the right and left side faces, always with the purpose of maintaining a distance enabling the probability of interference to be reduced.

The two interfaces can, however, be located on adjacent faces since their respective locations entail a distance sufficiently large to noticeably reduce the probability of interference. For example, the WIFI 3 interface can be located in the rear face RP of the STB receiver-decoder, close to the angle common with the left side face and the communication interface RF4CE 2 can be located on the right side face, close to the angle common with the front side FP. In this location example, the distance that separates the two interfaces is as large as possible with respect to the STB receiver-decoder dimensions since it globally corresponds to a diagonal between two opposite angles, a receiver-decoder being most commonly of rectangular or square form.

It should be noted that usually a WIFI interface delivers a higher power than an RF4CE interface. This is due in large part to the standard applications for which they are used: interconnection to a local network for the WIFI interface and communication with an item of remote control equipment for the RF4CE interface. For this reason, the WIFI interface can be positioned against the rear face RP, even though this face sometimes includes a significant metal mass, in relation to the connections with the exterior generally located in the RP rear face (television set, amplifier, etc.). The interface RF4CE 2 is suitable for insertion into a chip card connector CONN1 1 compatible with the Standard IS07816, according to an embodiment of the invention. Standard ISO 7816 contains a set of standards which covers various aspects of the contact chip card. Parts -1 , -2 and -3 relate respectively to the physical characteristics, the dimensions and locations of the contacts, and the electronic signals and transmission protocol.

The chip card interface of the STB receiver-decoder can perform a coupling with a chip card compatible with standard ISO7816 (also called a microcontroller card) and a coupling with a communication module in accordance with the Standard RF4CE, inserted into the chip card connector. The coupling with the module RF4CE uses, for example, a high-speed serial bus compatible with the USB standard.

An important advantage of this implementation is that the interface circuits RF4CE 2 that operate in a frequency band identical to that of the WIFI 3 interface are set apart from the WIFI 3 interface circuits in order to reduce the risk of interference as far as possible. Notably, the antenna of the interface RF4CE 2 is outside the STB receiver-decoder unit and constituted of a track printed on a printed circuit compatible with insertion into a chip card connector such as the connector CONN1 .

The illustration of the STB receiver-decoder is simplified since the increasing incorporation of the functions useful for the reception and decoding of audiovisual programs is such that most of the circuits are often grouped together in a single "core" integrated circuit, conventionally called SOC (System on Chip). Hence, the STB decoder comprises a core circuit SOC1 20 which includes all the standard functions of demultiplexing of input signals, filtering, memory buffering, decoding, and restitution, as well as the other standard processes useful for the functions of an item of audiovisual program receiver-decoder equipment. These other processes comprise, for example, the control and management of peripherals. The STB receiver-decoder also comprises an input interface IN1 21 and an output interface OUT1 22. The input interface IN1 21 receives the signals. It can be of such nature to receive signals from an item of equipment of ADSL modem type or a cable network, for example, by the input link 24. The output interface OUT1 22 formats the output signals with a view to the restitution of audiovisual programs on an external item of restitution equipment, such as a TV set, for example. The connection to the external equipment is made by the output link 25.

The core circuit of the STB receiver-decoder comprises a control unit which enables the control and management of interfaces IN1 21 and OUT1 22 via the intermediary of a control bus 26.

The receiver-decoder comprises a switching logic module COMM 23 enabling signal switching between the core circuit SOC1 20 and the chip card connector CONN1 1 according to the type of peripheral inserted into the connector CONN1 1 . When a chip card is inserted, the chip card controller signals of the core circuit SOC1 20 are connected to the connector CONN1 1 . When a communication module RF4CE 2 is detected, at least a part of the signals connected to the connector CNN1 1 enables the control of the communication module RF4CE 2. The WIFI 3 interface located in the rear face RP of the STB receiver-decoder (on the motherboard or on a specific rear face module) is controlled by the control unit SOC1 20 via the communication bus 27 which also ensures the transmission and reception of useful data from and to the interface. Figure 2 shows a chip card interface enabling the coupling of the communication module RF4CE 2 according to an embodiment of the invention. The chip card interface enables the coupling of a chip card with a chip card controller 13 comprised in a processor SOC1 20. The interface comprises a connector CONN1 1 adapted to the connection of a chip card according to the standard ISO 7816. The connector 1 comprises a power pin 3 connected to a first power line 5 and two auxiliary contacts AUX1 8 and AUX2 9. The interface also comprises:

- a switch C2 7 adapted to the connection of a USB controller 14 (integrated into the processor SOC1 20) to the auxiliary contacts AUX1 8 and AUX2 9 of the chip card connector 1 .

- a switch C1 6 adapted to the connection of a power line 4 to the power pin 3 of the chip card connector 1 , in place of power line 5,

- a control unit CU1 15, associated with a group of input/output ports 101 16, used for the identification of a peripheral inserted into the chip card connector 1 and for the control of the switches 6 and 7 according to the identification of the peripheral inserted into and detected in the chip card connector 1 .

The control unit CU1 15, the input/output ports module 101 16, the chip card controller CTRL1 13 and the USB controller CTRL2 14 are interconnected via a data exchange bus IB1 19. The control unit CU1 15 uses this bus for all read and write data exchanges, from and to modules 13, 14 and 16. The input and output ports module 101 16 is used by the control unit CU1 15 for the configuration of the signal switches C1 6 and C2 7.

The receiver-decoder comprising the chip card interface is initialized when switched on such that the default coupling of the interface is adapted to the exchange of signals between the chip card controller CTRL1 13 and a peripheral 2 of chip card type. The control unit CU1 15 of the main processor SOC1 20 then programs the chip card controller 13 to establish an initialization sequence for communication with the chip card (peripheral 2). This sequence is called ATR (Answer to Reset). The first response of the chip card to the chip card controller 13 contains bytes enabling the controller to determine operating parameters specific to the chip card, such as, for example, the transmission speed of the data or details of the format of the data which could be exchanged. The analysis of this answer to reset enables the control unit CU1 15 to check that the peripheral 2 inserted into the chip card connector 1 is a chip card. If the answer to reset is not in accordance with the specific format expected, or if no suitable response arrives before the end of a time interval of a predetermined duration (a few hundred milliseconds, for example), the control unit CU1 15 considers that the peripheral is not a chip card and that it is therefore an RF4CE communication module.

"Suitable response" here means a succession of logical words coding coherent items of information which match the ATR data frame and in accordance with a standard for communication between a chip card controller and a chip card. The control unit CU1 15 comprises the set of elements useful for the functions previously described and notably an arithmetic and logic unit, registers, random access memory, non-volatile memory and clock systems; all these elements not being described in more detail here, being well known to those skilled in the art. The signal switch C1 6 is configured by default to connect power line PL1 5 to the voltage pin PL 3 of the chip card connector 1 . The voltage available on power line PL1 5, generated by power supply module UG1 17, is adapted to the power supply of a chip card.

The signal switch C2 7 is configured by default for the connection of signals dedicated to access control to pins AUX1 8 and AUX2 9 of the chip card connector 1 when the use of the chip card coupled with the receiver- decoder equipment comprises access control functions using signals to be transmitted via the intermediary of these pins (this is the case, for example, for one of the access control solutions available on the market). According to a variant embodiment, nothing is connected to pins AUX1 8 and AUX2 9 in the default configuration, notably in the absence of use of control signals specific to a particular access control solution.

When the answer to reset is not in accordance with one of the formats enabling the control unit to validate the presence of a chip card (peripheral 2) in the connector CONN1 1 , the control unit CU1 15 configures the signal switches C1 6 and C2 7 such that the USB bus BUS2 12 of the USB controller CTRL2 14 is connected to pins AUX1 8 and AUX2 9 of the connector CONN1 1 and that the power line PL2 4, whose voltage is generated by power supply module UG2 18, is connected to the power pin PL3 of the connector CONN1 1 . The power line PL2 4 is adapted to supplying electrical power to a USB bus as defined by standard USB2 0. When these connections are established, so as to connect a USB bus and a power line PL2 4 compatible with the USB standard, the control unit CU1 15 of the processor SOC1 20 can control the communication module RF4CE 2 interfaceable via a USB bus.

Cleverly, it is then possible to locate the communication module RF4CE 2 controlled by a USB interface in the STB receiver-decoder equipment so that the set of the corresponding circuits are set as far apart as possible from the WIFI wireless network interface 3 with respect to the overall dimensions of the STB receiver-decoder unit, and with an antenna outside the STB receiver-decoder unit, and without having recourse to another connector other than the chip card connector. This has the advantage of greatly facilitating the location of the interface RF4CE 2 and considerably reduces the risks of interference between two interfaces (WIFI 3 and RF4CE 2) operating in the same frequency band. Such a module (RF4CE) is assembled on a (printed circuit) board compatible with insertion into a standard chip card connector and comprises a controller dedicated to communication in accordance with the RF4CE Standard. The antenna is integrated into the printed circuit. Advantageously, the different components which constitute the interface RF4CE are positioned such that they are inserted into the housing unit of the STB receiver-decoder equipment when the communication module RF4CE is connected to the chip card connector CONN1 1 . According to a variant, the components can be retained outside the STB receiver-decoder unit, like the antenna, and be protected by a varnish, a protective cover or a shielding (or even any one of the housings attached on the printed circuit of the module). The circuit S0C1 20 comprises, in addition to the elements shown in the figure 2, modules for reception, demultiplexing, memory buffering, decoding and restitution of data for the implementation of processes useful for the reception and restitution of received audiovisual programs.

Besides the possible control signals specific to the access control function which can be applied to pins AUX1 8 and AUX2 9, the signals used for the exchange of data between the chip card controller CTRL1 13 and a peripheral 2 of chip card type are not detailed here. These signals constitute the bus BUS1 1 1 shown in figure 2. Their connections to the connector CONN1 are provided by a set of pins B 10. These signals are described in standard ISO 7816 which defines a chip card interface standard.

Figure 3 is a diagram showing a method for managing the chip card interface of the STB receiver-decoder equipment. The connector of the chip card interface, initially provided for the insertion of a chip card, can receive the module for the connection of a wireless network RF4CE 2, according to the embodiment of the invention. To do this, the method comprises the steps described hereafter:

Step SO corresponds to the overall initialization of the STB receiver-decoder after switch-on. The different modules and register are initialized for the implementation of the operations of reception and decoding of audiovisual programs received in the form of data. In step S1 , the control unit configures the chip card controller CTRL1 13 and the USB controller CTRL2 14, and the signal switches C2 7 and C1 6. The signal switches are configured for the connection of the signals of the chip card controller 13 to the corresponding pins of the chip card connector CONN1 1 . The USB bus BUS2 12 is not connected to the connector CONN1 1 . In step S2, the control unit CU1 15 detects the insertion of a peripheral into the connector CONN1 1 . The detection is carried out by activation of an electromagnetic contactor of microswitch type integrated into the connector CONN1 1 . The microswitch is connected to the input/output port 101 16. In step S3, the chip card controller transmits an ATR frame as defined in standard ISO 7816 and receives the answer to reset from the inserted chip card, if necessary. The response is received by the chip card controller CTRL1 and stored in the random access memory of the control unit CU1 15. The control unit analyses the response by reading the data received in its memory and determines in step S4 whether the response is in accordance with the form and the content possibly expected, which validates the presence of a chip card if this is the case.

In step S5, in the case where the presence of a chip card is detected, the control unit CU1 15 manages the exchanges with the chip card inserted into the connector 1 and carries out the set of processes appropriate to and useful for the overall operation of the STB receiver-decoder specific to the case of the presence of a chip card. The set of these processes is called Proc. 1 (as in process 1 ). The exchanges between the control unit CU1 15 and the chip card are made via the intermediary of the chip card controller CTRL1 13 and bus BUS1 1 1 compatible with standard IS07816. Step S6 corresponds to the case where the recognition of a chip card has failed during the answer-to-reset test (which corresponds to the initialization phase of a chip card coupler). The control unit reconfigures the signal switches C2 7 and C1 6. The signal switches are configured this time for the connection of the signals of the USB controller 14 to pins AUX1 8 and AUX2 9 of the chip card connector CONN1 1 . The USB bus BUS2 12 is then connected to the connector CONN1 1 and the power line PL2 is connected to pin PL 3 of the chip card connector CONN1 1 with a view to supplying power to the peripheral 2 in the case where this is the connection module RF4CE 2. The control unit performs an initialization of the USB controller CTRL2 14 and a phase of recognition of the inserted peripheral 2, for example, according to the enumeration phase defined by the USB standard, and checks notably if the peripheral is the module RF4CE2, in the absence of a chip card (and in the presence of an inserted peripheral). If the expected peripheral is not the expected communication module RF4CE 2, then the process returns to the step of configuration S1 and waits for the detection of a new insertion of a peripheral into the connector CONN1 1 . If the communication module RF4CE 2 is correctly identified in steps S6 and S7, then in step S8, the control unit CU1 15 manages the exchanges with the communication module RF4CE 2 inserted into the connector 1 and carries out the set of processes appropriate to and useful for the overall operation of the STB receiver-decoder specific to the case of the presence of the communication module RF4CE 2. The exchanges between the control unit CU1 15 and the communication module RF4CE 2 are made via the intermediary of the USB controller CTRL2 14 and the bus USB BUS2 12. The set of these processes is called Proc. 2 (as in process 2).

According to an embodiment of the invention, the phase of recognition of the inserted communication interface comprises a step of transmission of at least a first logical word to the communication interface from a control module of the receiver-decoder, such as the USB controller CTRL 2 for example, and a step of waiting, for a time interval of a predetermined duration, for a logical word transmitted by the interface to the USB control module CTRL 2 in response to the first logical word.

According to the embodiment, after one of the types of peripheral 2, chip card or communication module RF4CE 2, has been detected and implemented normally, it is necessary to restart the STB receiver-decoder to return to the overall initialization step SO.

The invention does not apply solely to the embodiment described above but relates to any system enabling, in an item of equipment, the automatic detection of insertion into a chip card interface connector, and the coupling with the equipment of a communication module RF4CE 2. More specifically the invention also applies to a communication module RF4CE 2 controlled by a parallel bus or when the type of chip card coupler used is defined by a standard other than standard ISO 7816.

Figure 4 shows the coupling of the communication module RF4CE 2 to the chip card connector CONN1 , and specifically the connection lines. The communication controller circuit RF4CE CTRL is supplied via the pins PL 3 and B 10 of the connector CONN1 . The control signals and the data exchange between the STB receiver-decoder and the controller RF4CE CTRL of the communication module RF4CE 2 are carried out via AUX1 8 and AUX2 9 pins of the connector CONN1 . The antenna RF4CE ANT is connected to the controller RF4CE CTRL and positioned at the end of the communication module RF4CE 2 to be placed outside the STB receiver- decoder unit.

It is common that a communication module RF4CE is used for the interfacing of a remote control device (a remote control for example), the device being powered by a battery (rechargeable or non-rechargeable). Also, the transmission power of such a device is limited in order to limit the power consumption. Besides the advantage related to the increased distance to the interface WIFI 3, the presence of the antenna RF4CE ANT outside STB receiver-decoder unit also has an advantage in terms of sensitivity in reception of frames sent from a remote control device RF4CE.

The figure 5 shows the communication module RF4CE 2 and displays a footprint with several contacts compatible with the connectors of a chip card which meet the criteria of the standard ISO 7816, with a view to enabling the connection of the controller RF4CE CTRL to the STB receiver- decoder.

The invention is not limited to the embodiment described above but applies also to a chip card interface enabling the interfacing of a chip card comprising a controller circuit RF4CE. According to this variant, exchanges can take place with a microcontroller carrying out the chip card functions while implementing the communication interface RF4CE on the same card (or on the same module). The line for supplying power to the chip card incorporating an RF4CE module is therefore always activated to enable the supply of two controllers simultaneously. According to a variant of the embodiment of the invention, the control bus of the communication interface controller RF4CE is a serial bus different from USB, such as, for example an I2C bus or a bus according to another serial protocol.

Claims

1 . Wireless communication interface (RF4CE 2), characterized in that it comprises:

• a wireless communication controller (RF4CE CTRL) assembled on a printed circuit (PCB), said printed circuit (PCB) comprising a footprint with several contacts (SC-CONN) and said printed circuit (PCB) being suitable for insertion into a chip card connector (CONN1 ), · an antenna (RF4CE) situated at the end of said printed circuit (PCB), said end being opposite the end suitable for insertion into said chip card connector (CONN1 ), contacts (AUX1 , AUX2) of said footprint with several contacts (SC-CONN) being used for transmitting data by said wireless communication interface (RF4CE 2).

2. Interface (RF4CE 2) according to claim 1 , characterized in that the transmission frequency of said data is equal to 2.4 GHz.

3. Interface (RF4CE 2) according to claim 1 or 2, characterized in that it is compatible with a standard for radio-frequency transmission over short distances.

4. Interface (RF4CE) according to any one of the preceding claims, characterized in that said footprint comprises eight contacts.

5. Interface (RF4CE 2) according to any one of the preceding claims, characterized in that said standard for transmission over short distances is compatible with the standard RF4CE IEEE 802.15.4 or one of its evolution versions.

6. Electronic device (STB) comprising a front face (FP), a rear face (RP), a right side face, a left side face, a motherboard, a first wireless communication interface compatible with a standard Wifi 802.1 1 (WIFI 3) and a second wireless communication interface (RF4CE 2) according to any one of the claims 1 to 4, said device being characterized in that : said first wireless interface (WIFI 3) is located on a first face of said electronic device,

Said second wireless interface (RF4CE 2) is located on a second face of said device and is suitable for connection to said motherboard via the intermediary of a chip card connector (CONN1 ), said second face being different from said first face and said second wireless interface (RF4CE 2) comprising an antenna (RF4CE ANT) outside said electronic device (STB).

7. Electronic device (STB) according to the claim 6, characterized in that said second face of said electronic device is opposite said first face of said electronic device.

8. Electronic device according to claim 7, characterized in that

said second face of said electronic device is adjacent to said first face of said electronic device.

9. Electronic device according to any one of the claims 7 or 8, characterized in that said device is an audiovisual program receiver-decoder.

10. Electronic device according to any one of the claims 7 or 8, characterized in that said device is a gateway for connection to a local home network.

1 1 . Method for detecting a wireless communication interface (RF4CE) in a connector (CONN1 ) of a chip card coupler for a receiver-decoder (STB) characterized in that said method comprises the steps of : - transmitting (S3) a chip card initialization sequence, - waiting for a response (S4) to said initialization sequence in order to determine if a chip card is present in the connector (CONN1 ), and, in the absence of a response in accordance with said initialization sequence of a chip card transmitted in a first time interval of a first predetermined duration, establishing a phase of recognition of said wireless communication interface (RF4CE 2).

12. Method for detection according to the preceding claim characterized in that said phase of recognition of said communication interface (RF4CE) comprises :

- a step for transmission of at least a first logical word to said communication interface (RF4CE 2) from a control module (USD CTRL 2) of said receiver- decoder (STB).

- a step of waiting for a second time interval of a second predetermined duration, of a second logical word transmitted by said interface (RF4CE) to said control module (USB CTRL 2) in response to said first logical word.