Transmission and reception system and signal generation method for same
First Claim
1. A transmission and reception system comprising:
- a transmitter including a first variable code generator and means for transmitting a plurality of transmitted-signal groups, each transmitted-signal group including identification information and command information, the identification information including a fixed code and a variable code obtained from the first variable code generator, the command information including one of a security device activation command code and a security device deactivation code; and
a receiver including;
a memory;
means for receiving and comparing the transmitted fixed code and the command information with values stored in the memory;
a second variable code generator;
means for updating an operation state of the second variable code generator when the received fixed code coincides with the stored fixed code and the received command code coincides with a system activation command code such that the second variable code generator is synchronized with the first variable code generator; and
means for processing the command information when the transmitted identification information fixed code is the same as the stored value and the received command code coincides with a system deactivation command code.
1 Assignment
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Accused Products
Abstract
A transmission and reception system including a transmitter for transmitting a signal including identification (security) information and function information, and a receiver for receiving and decoding the signal and for executing the operation defined by the function information upon verification of the identification information. The transmitter divides one or more of the identification information and the function information into two or more bit groups, and transmits these bit groups such that identification information bit groups are separated by function information and function information bit groups are separated by identification information. In one embodiment, the intermixed function and identification bit groups are transmitted without a time gap, and in another embodiment the function bit groups and the identification bit groups are arranged in groups containing one or more function information bit groups and one or more identification information bit groups, these groups then being transmitted with a time gap therebetween. The receiver includes information necessary for recombining the identification information and the function information for performing verification of the identification information and execution of the operation defined by the function information. In a further embodiment the identification information includes both fixed and variable codes, the variable code being changed after each transmission.
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Citations
18 Claims
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1. A transmission and reception system comprising:
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a transmitter including a first variable code generator and means for transmitting a plurality of transmitted-signal groups, each transmitted-signal group including identification information and command information, the identification information including a fixed code and a variable code obtained from the first variable code generator, the command information including one of a security device activation command code and a security device deactivation code; and a receiver including; a memory; means for receiving and comparing the transmitted fixed code and the command information with values stored in the memory; a second variable code generator; means for updating an operation state of the second variable code generator when the received fixed code coincides with the stored fixed code and the received command code coincides with a system activation command code such that the second variable code generator is synchronized with the first variable code generator; and means for processing the command information when the transmitted identification information fixed code is the same as the stored value and the received command code coincides with a system deactivation command code. - View Dependent Claims (2)
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3. A security system comprising a portable transmitter for transmitting a radio frequency signal and a security device including a receiver for receiving the transmitted radio frequency signal, wherein the portable transmitter includes:
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a keypad including a system activation key and a system deactivation key, a first memory for storing a fixed code, a system activation command code and a system deactivation command code, a first variable code generator for generating a variable code in accordance with predetermined criteria, a controller for retrieving the fixed code and a selected one of the system activation command code and the system deactivation command code from the first memory, for obtaining the variable code from the first variable code generator, and a transmitter circuit for transmitting the radio frequency signal such that information corresponding to the fixed code, the variable code and the selected command code is transmitted in a predetermined order; and
wherein the receiver includes;a second memory, a second variable code generator, means for converting the received radio frequency signal into a received fixed code, a received variable code and a received command code, means comparing the received fixed code with a fixed code stored in the second memory, means for obtaining a second variable code from the second variable code generator, comparing the second variable code with the received variable code, and deactivating the security system only when the second variable code coincides with the received variable code, the received fixed code coincides with the stored fixed code and the received command code coincides with a system deactivation command code, and means for updating an operating state of the second variable code generator using the received variable code when the received fixed code coincides with the stored fixed code and the received command code coincides with a system activation command code. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A method for remotely controlling a security device in response to a radio frequency signal transmitted from a transmitter, the security device including a receiver for receiving the transmission signal, the method comprising:
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transmitting the radio frequency signal from the transmitter in accordance with the following steps; recalling a fixed code and a selected command code from a first memory, obtaining a first variable code from a variable code generator, generating a second variable code by incrementing the first variable code in accordance with a predetermined function, transmitting the radio frequency signal such that information corresponding to the fixed code, the second variable code and the selected command code is transmitted in a predetermined order; and in response to reception of the transmitted radio frequency signal by the receiver, controlling the security device by; converting the received radio frequency signal into a received fixed code, a received variable code and a received command code, comparing the received fixed code with a fixed code stored in a second memory of the receiver, if the received fixed code coincides with the stored fixed code; obtaining a third variable code from a variable code holder mounted of the receiver, comparing the third variable code with the received variable code, if the third variable code does not coincide with the received variable code, updating the third variable code by incrementing the third variable code in accordance with the predetermined function, and comparing updated third variable code with the received code, and if either of the third variable code or the updated third variable code coincide with the received variable code; causing the security device to operate in accordance to the received command code, generating a fourth variable code by incrementing the third variable code in accordance with the predetermined function, and replacing the third variable code stored in the variable code holder with the fourth variable code. - View Dependent Claims (10)
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11. A security system comprising a portable transmitter for transmitting a radio frequency signal and a security device including a receiver for receiving the transmitted radio frequency signal, wherein the portable transmitter includes:
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a first memory for storing a fixed code and a command code, a variable code generator for storing a first variable code, a controller for retrieving the fixed code and the command code from the first memory, and for providing a second variable code generated by incrementing the first variable code in accordance with a predetermined function, and a transmitter circuit for transmitting the radio frequency signal such that information corresponding to the fixed code, the second variable code and the command code is transmitted in a predetermined order; and
wherein the receiver includes;a second memory, a variable code holder, means for converting the received radio frequency signal into a received fixed code, a received variable code and a received command code, means comparing the received fixed code with a fixed code stored in the second memory, means for obtaining a third variable code from the variable code holder, for providing a fourth variable code generated by incrementing the third variable code in accordance with a predetermined function, the means for obtaining generates a predetermined number of updated variable codes by incrementing the fourth variable code in accordance with the predetermined function, compares each of the updated variable codes with the received variable codes, and causes the security system to operated in accordance with the received command code only when one of the updated variable codes coincides with the received variable code, and means for updating an operating state of the variable code holder using one of the third variable code and one of the updated variable codes. - View Dependent Claims (12)
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13. A method for remotely controlling a security device in response to a radio frequency signal transmitted from a portable transmitter, the portable transmitter having a keypad including a device activation key and a device deactivation key, the security device including a receiver for receiving the transmission signal, the method comprising:
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in response to manipulation of the keypad, transmitting the radio frequency signal from the transmitter in accordance with the following steps; recalling a fixed code and a selected command code from a first memory, obtaining a variable code from a first variable code generator provided in the transmitter, and transmitting the radio frequency signal such that information corresponding to the fixed code, the variable code and the selected command code is transmitted in a predetermined order; and in response to reception of the transmitted radio frequency signal by the receiver, controlling the security device by; converting the received radio frequency signal into a received fixed code, a received variable code and a received command code; comparing the received fixed code with a fixed code stored in a second memory of the receiver, if the received fixed code coincides with the stored fixed code and the received command code coincides with a device deactivation command code, obtaining a second variable code from the second variable code generator, comparing the second variable code with the received variable code, and deactivating the security device only if the second variable code coincides with the received variable code, and if the received fixed code coincides with the stored fixed code and the received command code coincides with a device activation command code, updating an operating state of a second variable code generator provided in the receiver using the received variable code such that the second variable code generator is synchronized with the first variable code generator, and activating the security device. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification