Method for broadcasting a magnetic stripe data packet from an electronic smart card

• US 9,053,399 B2
• Filed: 04/03/2012
• Issued: 06/09/2015
• Est. Priority Date: 03/26/2005
• Status: Active Grant

• Current Assignee: Privasys Incorporated
• Original Assignee: Privasys Incorporated
• Inventors: Foo, Eric, Ziegler, Joan, Poidomani, Mark, Routhenstein, Lawrence, Alon, Ziv, McGuire, Charles
• Primary Examiner(s): Kim, Ahshik
• Application Number:
  US13/438,655
• Publication Number:
  US 20120205450A1
• Time in Patent Office: 1,162 Days
• Field of Search: 235/449, 235/451, 235/492
• US Class Current: 1/1
• CPC Class Codes: G06K 19/06206 the magnetic marking being emulated
• CPC Class Codes: G06K 19/0716 at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
• CPC Class Codes: G06K 19/073 Special arrangements for circuits, e.g. for protecting identification code in memory protection against unauthorised use of computer memory G06F12/14
• CPC Class Codes: G06K 19/07318 by hindering electromagnetic reading or writing jamming of communication, counter-measures H04K3/00; secret communication H04K1/00
• CPC Class Codes: G06Q 20/352 Contactless payments by cards
• CPC Class Codes: G07F 7/0806 Details of the card record carriers per se G06K
• CPC Class Codes: G07F 7/0846 On-card display means

Abstract

Method for broadcasting a magnetic stripe data packet from an electronic card by measuring a swipe speed of the electronic card past a magnetic reader head during a swipe of the electronic card past the magnetic reader head and then adjusting a broadcast signal containing the magnetic stripe data packet according to the measured swipe speed so that the magnetic stripe data packet in the broadcast signal is read by the magnetic reader head during said swipe. The swipe speed is measured by a speed sensor. The electronic card can contain a false swipe detection means so that the capacitive sensor changes from a sleep mode to an active mode after a wake up sensor is activated during the swipe and the swipe speed is measured by the capacitive sensor while it is in the active mode before the broadcast signal is broadcast during the swipe.

Claims

1. A method comprising broadcasting a transaction specific magnetic stripe data packet from an electronic card by measuring a swipe speed of the electronic card past a magnetic reader head during a swipe of the electronic card past the magnetic reader head and then adjusting a broadcast signal containing the magnetic stripe data packet according to the measured swipe speed so that the magnetic stripe data packet in the broadcast signal is read by the magnetic reader head during said swipe.

2. The method of claim 1 wherein the swipe speed is measured by a speed sensor.

3. The method of claim 2 wherein the electronic card contains a false swipe detection means.

4. The method of claim 3 wherein the speed sensor changes from a sleep mode to an active mode after a wake up sensor is activated during the swipe and the swipe speed is measured by speed sensor while it is in the active mode before the broadcast signal is broadcast during the swipe.

5. The method of claim 4 wherein the wake up sensor is a trip switch.

6. The method of claim 5 wherein the broadcast signal is adjusted by varying bit rate used to broadcast said broadcast signal.

7. The method of claim 1 wherein the magnetic stripe data packet is comprised of a track 2 data packet.

8. The method of claim 7 wherein the magnetic stripe data packet is further comprised of a track 1 data packet.

9. The method of claim 8 wherein cross talk in the magnetic reader head responsible for reading track 1 data is prevented by use of a cross talk blocker.

10. The method of claim 9 wherein the cross talk blacker is a cancelation coil located on the electronic card so as to prevent cross talk.

11. A method, comprising:

activating an electronic card from an off state to a sleep mode;

changing the electronic card from the sleep mode to an active mode after a wake up sensor is activated during a swipe of the electronic card past a magnetic reader head;

measuring a swipe speed of the electronic card past the magnetic reader head during the swipe;

using the swipe speed to adjust a broadcast signal containing a transaction specific magnetic stripe data packet; and

broadcasting the broadcast signal during the swipe so that the magnetic reader head reads the magnetic stripe data packet.

12. The method of claim 11 wherein a false swipe detection is prevented by measuring movement past a speed sensor.

13. The method of claim 11 wherein a broadcaster in the electronic card is activated during the active mode.

14. The method of claim 13 wherein the broadcast signal is adjusted by varying a bit rate used by the broadcaster to broadcast said broadcast signal.

15. The method of claim 13 wherein the broadcaster is comprised of a track 2 broadcaster that broadcasts a track 2 data packet and a track 1 broadcaster that broadcasts a track 1 data packet.

16. The method of claim 11 wherein a cross talk blocker is used to prevent the magnetic reader head from reading a particular track data packet in a reading area of the magnetic reader head that is not meant to read the particular track data packet.