Electronic access control device
First Claim
1. An electronic access control device comprising:
- a circuit having a portion deactivated during a first time period;
the portion of the circuit enabled during a second time period, the portion of the circuit having an enable output signal generated in response to a sensed electromagnetic signal;
the portion of the circuit being enabled for an extended time period that is greater than the second time period;
the portion of the circuit having an input code output generated in response to the electromagnetic signal and during the extended time period;
a microprocessor having an unlock output signal generated if the input code matches the access code; and
, an electromechanical driver having an output signal generated in response to the unlock signal.
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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
29 Claims
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1. An electronic access control device comprising:
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a circuit having a portion deactivated during a first time period;
the portion of the circuit enabled during a second time period, the portion of the circuit having an enable output signal generated in response to a sensed electromagnetic signal;
the portion of the circuit being enabled for an extended time period that is greater than the second time period;
the portion of the circuit having an input code output generated in response to the electromagnetic signal and during the extended time period;
a microprocessor having an unlock output signal generated if the input code matches the access code; and
,an electromechanical driver having an output signal generated in response to the unlock signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a first circuit comprising an oscillator and having a first circuit output signal;
a second circuit enabled and disabled in response to the first circuit output signal, the second circuit having a second circuit output signal generated in response to receipt of an electromagnetic signal;
a third circuit temporarily enabled during the receipt of the electromagnetic signal, the circuit having a third circuit output signal comprising an input code generated in response to receipt of an electromagnetic signal;
a fourth circuit temporarily enabled to compare the input code to an access code; and
,an electromechanical driver having an output that is provided to an unlock device if the input code matches the access code. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An apparatus comprising:
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an oscillator having an output comprising a plurality of duty cycles;
a circuit that is periodically enabled for a time t1 and disabled for a time t2 during at least some of the duty cycles;
a portion of the circuit that generates an input code in response to an electromagnetic signal;
a microprocessor that compares the input code to an access code;
a switch that enables the portion of the circuit as the input code is being received for a time t3 that is greater than the time t1. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A circuit operating on current drained from a battery comprising:
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an electronic circuit having an output that indicates detection of a device capable of providing an electromagnetic signal;
a decoder that extracts an input code transmitted via the electromagnetic signal;
a switch that, in response to an input, increases the current drained from the battery;
an electronic circuit that compares the input code to an access code;
an electronic circuit that provides an output to an unlock device if the input code matches the access code; and
,wherein the switch decreases the current drained from the battery after receiving the input code. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification