Multi-frequency security code transmission and reception
First Claim
1. A security code transmitter comprising:
- a source of security codes;
rf transmission apparatus capable of transmitting security codes at a plurality of radio frequencies;
a push button for user actuation;
a controller responsive to a first actuation of the push button for obtaining a security code from the source and controlling the rf transmission apparatus for transmitting a representation of the obtained security code at a default one of the plurality of radio frequencies and responsive to a second actuation of the push button within a predetermined period of time after the first actuation for controlling the transmission apparatus to transmit a representation of the security code at another one of the plurality of radio frequencies.
1 Assignment
0 Petitions
Accused Products
Abstract
A system is disclosed including a transmitter and receiver for the communication of security codes which may be validated at the receiver to operate equipment. In one embodiment, the transmitter transmits a security code at two frequencies contemporaneously to the receiver which may receive both frequencies and resolve the security code therefrom. The receiver may lock onto one frequency when parts of a security code are detected to the exclusion of the other frequency. In another embodiment, the transmitter selectively transmits security codes at a default frequency which is selected because of a recorded count of prior apparent successful transmission.
3 Citations
18 Claims
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1. A security code transmitter comprising:
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a source of security codes;
rf transmission apparatus capable of transmitting security codes at a plurality of radio frequencies;
a push button for user actuation;
a controller responsive to a first actuation of the push button for obtaining a security code from the source and controlling the rf transmission apparatus for transmitting a representation of the obtained security code at a default one of the plurality of radio frequencies and responsive to a second actuation of the push button within a predetermined period of time after the first actuation for controlling the transmission apparatus to transmit a representation of the security code at another one of the plurality of radio frequencies. - View Dependent Claims (2, 3, 4)
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5. A security code communication system comprising a transmitter comprising:
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a source of security codes;
rf transmission apparatus capable of transmitting security codes at a plurality of radio frequencies;
a push button for user actuation;
a controller responsive to a first actuation of the push button for obtaining a security code from the source and controlling the rf transmission apparatus for transmitting a representation of the obtained security code at a default one of the plurality of radio frequencies and responsive to a second actuation of the push button within a predetermined period of time after the first actuation for controlling the transmission apparatus to transmit a representation of the security code at another one of the plurality of radio frequencies; and
a receiving unit comprising;
rf receiver for receiving both the predetermined one and the second of the plurality of radio frequencies. - View Dependent Claims (6, 7)
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8. A security code transmitter comprising:
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a source of security codes;
rf transmission apparatus capable of transmitting security codes at a plurality of radio frequencies;
a push button for user actuation;
a controller responsive to a first actuation of the push button for measuring the period of time after the first button actuation, for obtaining a security code from the source and controlling the rf transmission apparatus to transmit a representation of the obtained security code at a default one of the plurality of radio frequencies and responsive to a second actuation of the push button for obtaining a security code and being responsive to the period of time since the first button actuation for controlling the transmission apparatus to transmit a representation of the security code at another one of the plurality of radio frequencies. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification