Communications: electrical – Selective – Interrogation response
Reexamination Certificate
1999-07-20
2003-05-06
Horabik, Michael (Department: 2635)
Communications: electrical
Selective
Interrogation response
C340S572100, C340S010100
Reexamination Certificate
active
06559754
ABSTRACT:
The invention relates to a method for the contactless transmission of data from a data carrier to a write/read station, wherein the write/read station generates a carrier signal and the generated carrier signal is applied to contactless operative transmitter means of the write/read station, wherein a carrier signal is obtained in the data carrier by means of contactless operative transmitter means of the data carrier which are coupled to the transmitter means of the write/read station in a contactless manner, wherein load modulation of the carrier signal is performed by means of one auxiliary carrier signal in a transmission mode for the transmission of a data block from the data carrier to the write/read station, wherein the carrier signal load modulated by means of the one auxiliary carrier signal is demodulated by means of demodulation means in the write/read station in order to obtain the transmitted data block, wherein a test is performed in the write/read station in order to determine whether disturbances occur in the signal path beyond the demodulation means, and wherein control information is generated upon detection of disturbances.
The invention also relates to a write/read station for the contactless reception of data from a data carrier, which station includes carrier signal generating means for generating a carrier signal and contactless operative transmitter means which can be supplied with the carrier signal and can be coupled to contactless operative transmitter means of the data carrier in a contactless manner so that a carrier signal can be obtained in the data carrier by means of the transmitter means of the data carrier, in which load modulation of the carrier signal can be performed by means of one auxiliary carrier signal in a transmission mode for the transmission of a data block from the data carrier to the write/read station, includes demodulation means for demodulating the carrier signal load modulated by means of the one auxiliary carrier signal, which demodulation means can output a data block transmitted from the data carrier to the write/read station, and includes test means which are arranged to test whether disturbances occur in the signal path beyond the demodulation means and to generate control information upon detection of disturbances.
The invention also relates to a data carrier for the contactless output of data to a write/read station, which data carrier includes contactless operative transmitter means which can be coupled to contactless operative transmitter means of the write/read station, where a carrier signal generated in the write/read station can be obtained in the data carrier in the coupled state, and also includes load modulation means whereby the carrier signal can be load modulated by means of one auxiliary carrier signal in a transmission mode for the transmission of a data from the data carrier to the write/read station.
The invention also relates to an integrated circuit for a data carrier for the contactless output of data to a write/read station, which circuit includes connection means for the connection of contactless operative transmitter means which can be coupled to contactless operative transmitter means of the write/read station, where a carrier signal generated in the write/read station can be obtained in the circuit in the coupled state, and also includes load modulation means whereby the carrier signal can be load modulated by means of one auxiliary carrier signal in a transmission mode for the transmission of a data block from the circuit to the write/read station.
In the context of the present invention reference is made to a data carrier system which is realized in many versions and is marketed by the present Applicant so that it is known. In addition to this known data carrier system, reference is made to the patent document U.S. Pat. No. 5,345,231, whose publication is incorporated herein by way of reference. In the known data carrier system a carrier signal which is generated in the write/read station and inductively obtained in the data carrier is subjected to load modulation by means of an auxiliary carrier signal in order to transmit digital data, i.e. data blocks, from a data carrier to a write/read station; the auxiliary carrier signal then has an auxiliary carrier frequency f
1
of 423.75 kHz and the ratio of this auxiliary carrier frequency f
1
to the carrier frequency f
0
of the carrier signal amounts to an integer number. A “0” bit, for example, is then transmitted from the data carrier to the write/read station by load modulation of the carrier signal by means of the auxiliary carrier signal during the first bit half and by omission of load modulation of the carrier signal during the second bit half, whereas a “1” bit is transmitted from the data carrier to the write/read station by omission of load modulation of the carrier signal during the first bit half and by load modulation of the carrier signal by means of the auxiliary carrier signal during the second bit half. If at least one disturbance occurs during the execution of the data transmission from the data carrier to the write/read station, and hence, for example an error in the data transmission, such a disturbance is detected by means of test means which are included in the write/read station and are formed, for example by a logic circuit or a microcomputer or a CRC stage (Cross Redundancy Check stage); these test means generate control information upon detection of disturbances. In the known data carrier system this control information is used exclusively for indication purposes in order to draw the attention of a user of the data carrier system to a disturbed or incorrect operation. A user of the known data carrier system can then attempt to take steps so as to avoid the further occurrence of such disturbances. This is experienced as a nuisance which actually constitutes a shortcoming that cannot be eliminated by numerous users.
It is an object of the invention to avoid the described problems and to provide, in a simple manner and using simple means, an improved write/read station of the kind set forth in the second paragraph, an improved data carrier of the kind set forth in the third paragraph as well as an improved integrated circuit of the kind set forth in the fourth paragraph, so that application of these improved means enables execution of an improved method of the kind set forth in the first paragraph.
In order to achieve the described object a method of the kind set forth in the first paragraph according to the invention is characterized in that at least one transmission mode data block is generated as control information, that the transmission mode data block is transmitted to the data carrier, that the transmitted transmission mode data block is evaluated in the data carrier and that, in conformity with the evaluation of the transmitted transmission mode data block, the data carrier is controlled to an other transmission mode in which, in order to transmit a data block from the data carrier to the write/read station, load modulation of the carrier signal is performed by means of at least one other auxiliary carrier signal, the at least one frequency of the at least one other auxiliary carrier signal and the frequency of the one auxiliary carrier signal having different values.
In order to achieve the described object a write/read station of the kind set forth in the second paragraph according to the invention is characterized in that the test means are arranged to generate at least one transmission mode data block as control information whereby in the data carrier an other transmission mode can be activated in which load modulation of the carrier signal can be performed by means of at least one other auxiliary carrier signal in order to transmit a data block from the data carrier to the write/read station, the at least one frequency of the at least one other auxiliary carrier signal and the frequency of the one auxiliary carrier signal having different values.
In order to achieve the described object a data carrier of the
Brown Vernal
Koninklijke Philips Electronics , N.V.
Ure Michael
LandOfFree
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