Electronic access control device
First Claim
1. A method comprising the steps of:
- deactivating a circuit during a first time period;
enabling a portion of the circuit for a second time period;
sensing an electromagnetic signal during the second time period;
enabling the circuit for an extended time period that is greater than the second time period upon the sensing of the electromagnetic signal;
processing the electromagnetic signal during the extended time period to obtain an input code;
comparing the input code to an access code; and
, providing a signal to unlock a device if the input code matches the access code.
2 Assignments
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Accused Products
Abstract
An electronic lock utilizes two microprocessors remote from each other for enhanced security. The first microprocessor is disposed close to an input device such as a keypad, and the second microprocessor is disposed close to the lock mechanism and well protected from external access. The first microprocessor transmits a communication code to the second microprocessor when it receives via the input device an access code that matches a preset access code. The second microprocessor opens the lock if the transmitted communication code matches a preset communication code. The dual-microprocessor arrangement is advantageously used in a voice controlled access control system and in a motorcycle ignition control system. The present invention further provides an electronic access control system which has a master electronic key having a preset number of access, and an electronic alarm system for a bicycle that has a remote control mounted in the helmet of the rider.
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Citations
20 Claims
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1. A method comprising the steps of:
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deactivating a circuit during a first time period;
enabling a portion of the circuit for a second time period;
sensing an electromagnetic signal during the second time period;
enabling the circuit for an extended time period that is greater than the second time period upon the sensing of the electromagnetic signal;
processing the electromagnetic signal during the extended time period to obtain an input code;
comparing the input code to an access code; and
,providing a signal to unlock a device if the input code matches the access code. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising the steps of:
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periodically enabling and disabling a circuit during each of a plurality of duty cycles wherein the circuit is enabled for a time t1 during each of the duty cycles;
receiving an input code transmitted via an electromagnetic signal;
comparing the input code to an access code;
enabling the circuit as the input code is being received for a time t2 that is greater than said time t1; and
,providing a signal to unlock a device if the input code matches the access code. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for operating a circuit on current drained from a battery comprising the steps of:
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generating a signal to indicate detection of a device capable of providing an electromagnetic signal;
receiving an input code transmitted by the electromagnetic signal;
increasing the current drained from the battery;
comparing the input code to an access code;
providing an output to an unlock device if the input code matches the access code; and
,decreasing the current drained from the battery after receiving the input code. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification