152 results about "Rolling code" patented technology

A processor-based transmitter-receiver system and method in which a receiver receives coded signals from at least two transmitters. A circuit for receiving a first coded signal from a first transmitter and a second coded signal from a second transmitter. Each of the coded signals includes a unique identification code and a variable security code. A memory stores at least two codes, each including a unique identification code and a variable security code. A processor coupled to the circuit and the memory, compares each of the received coded signals with each of the stored sets of codes. The processor generates a valid signal if one of the received coded signals matches one of the stored codes.

A signaling device that receives coded signals from a transmitter. The signaling device includes a first circuit that receives a from the transmitter. The first code includes a first identification code and a first variable code. The signaling device further includes a memory that stores a second code. The second code includes a second identification code and a second variable code. The signaling device further includes a second circuit coupled to the first circuit and the memory. The second circuit generates an output signal if the first code matches the second code. The signaling device further includes an annunciator circuit coupled to the second circuit. The annunciator circuit provides a perceivable indicator if the second circuit generates the output signal.

The present invention provides a universal remote control. For each channel supported, a mode is initially established as rolling mode. For a fixed code appliance, a fixed code is received and stored, and the mode changed to fixed mode. When an activation request is received, the mode associated with that activation input is examined. If the mode is rolling mode, a sequence of rolling code activation signals is transmitted, each based on one of the plurality of rolling code transmission schemes. If the mode is fixed mode, at least one activation signal is transmitted based on a fixed code transmission scheme and including the stored fixed code.

A wireless communication system for a vehicle has a portable device that transmits a wireless signal and a vehicle-mounted device that receives the wireless signal from the portable device. Each time a switch in the portable device is turned on, the portable device updates a portable device rolling code and transmits a wireless signal including the portable device rolling code. The vehicle-mounted device receives the wireless signal through a receiver and authenticates the portable device through comparison between the portable device rolling code included in the wireless signal and the vehicle rolling code. The vehicle-mounted device locks or unlocks the vehicle door if the portable device is authenticated. When the wireless signal is received through the receiver after the most recent locking or unlocking of the vehicle door has been carried out using the mechanical key, the vehicle-mounted device locks or unlocks the vehicle door if the switch is turned on for n (n is an integral number greater than or equal to 2) times or more.

A universal remote control transmits one of a plurality of sequences of activation signals when activated. The remote control includes a receiver and a transmitter. At least one wireless channel is associated with a user activation input. Memory holds data describing rolling code transmission schemes and fixed code transmission schemes. Control logic maintains a channel mode set initially to a rolling code mode. The channel mode changes to one of at least one fixed code mode if the channel is trained to a fixed code. In response to an assertion of the user activation input for a particular channel, the control logic generates and transmits an activation signal based on each of a plurality of transmission schemes associated with the mode programmed for the channel.

A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.

A universal remote control interacts with a user to assist in training to one or more appliances. If the appliance is activated by a rolling code activation signal, a sequence of different rolling code activation signals is transmitted until the user indicates a successful rolling code transmission. If the appliance is activated by a fixed code activation signal, a fixed code word is used to generate and transmit each of a sequence of different fixed code activation signals until the user indicates a successful fixed code transmission. In response to an activation input, an activation signal is generated and transmitted based on data stored following user indication of a successful transmission.

A universal remote control interacts with a user to assist in training to one or more appliances. If the appliance is activated by a rolling code activation signal, a sequence of different rolling code activation signals is transmitted until the user indicates a successful rolling code transmission. If the appliance is activated by a fixed code activation signal, a fixed code word is used to generate and transmit each of a sequence of different fixed code activation signals until the user indicates a successful fixed code transmission. In response to an activation input, an activation signal is generated and transmitted based on data stored following user indication of a successful transmission.

A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.

A computer implemented method transmits and receives an information signal. A common start position is established for the receive mode where the information signal is received and a transmit mode where the information signal is transmitted. Either the receive mode to receive the information signal or the transmit mode to transmit the information signal is entered subsequent to establishing the common position. The start position is returned to after the receive mode the transmit the learn mode and the self-test mode has been entered.

The invented identity identification system includes car-mounted control module, identity identification module and unlocking control module. Its identity identification method includes the following steps: car-mounted control module can produce first encrypted information produced by using first encrypted key, serial number, random data and instantaneous data rolling code of counter and transmit the signal with first encrypted information; the identity identification module can be used for receiving said signal to make identity identification, producing second encrypted information produced by using first encrypted information and second encrypted key and transmitting the feedback signal with second encrypted information; the car-mounted control module can be used for receiving said feedback information, making identity identification and controlling unlocking control module to execute unlocking operation.

An immobilizer ECU (20) compares an internally stored reference code with a key code transmitted from a key (10). An engine ECU (24) transmits a rolling code A when an engine speed reaches 500 rpm. The immobilizer ECU (20) transmits a rolling code B when the codes coincide with each other. The engine ECU (24) will stop an engine if it cannot receive the rolling code B within a prescribed period of time. Further, there is provided a counter CIMMOF which is incremented at the beginning of such a process. The counter CIMMOF is reset only when the process is normally completed. If an ignition is turned off prior to transmission and reception of the rolling codes, the counter CIMMOF will be counted up. According to a value of the counter CIMMOF, a period of waiting for the rolling code B is gradually shortened. Further, when the process is completed or a backup power supply to a backup memory (24d) is cut off, a time to transmit and receive the rolling codes is advanced. Thus, the situation where the engine will be able to start due to disconnection of a communication line or the like is prevented.

A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. To provide even greater security, the transmitter is limited in the number of times it may perform a resynchronization procedure. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.

The invention discloses a thermal foaming handheld inkjet printer provided with a code reader inside. The thermal foaming handheld inkjet printer comprises an inkjet printer body with a handle, a roller module arranged at the front end of the inkjet printer body, and a battery mounted at the bottom of the handle and capable of being inserted and pulled; and the code reader, a 4G module and a WiFi module are positioned in the inkjet printer body. The thermal foaming handheld inkjet printer integrates the code reader with a 4G data transmission function, solves the problem that a traditional handheld inkjet printer needs to externally connect with scanning equipment to realize scanning and uploading of information, and adopts a module design structure of upper and lower rollers to enable the rolling code spraying to become more convenient.

A rolling coda transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling cede. A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and roiling codes with stored codes and determining that the signal has emanated from an authorized transmitter, a signal is generated to actuate an electric motor to open or close a movable barrier.

The invention discloses a remote control key, tire pressure monitoring and engine anti-theft locking system, which comprises an automobile body controller, a tire pressure monitoring module, a remote control key module and an engine anti-theft locking module, wherein on the basis of the system integration technology, an automobile remote control entry system, an engine anti-theft locking system and a tire pressure monitoring system are combined into a whole, and the hardware redundancy is reduced. The remote control key module and the tire pressure monitoring module are connected with the automobile body controller in a wireless way of 434MHz, and the engine anti-theft locking module is connected with the automobile body controller in a low-frequency wireless way of 125MHz. Wireless data emitted by the remote control key and the tire pressure monitoring module adopts a 434MHz frequency range, a frequency shift keying modulation mode and a Manchester data encoding mode. The remote control key data after the Keeloq rolling code encryption is distinguished from the tire pressure monitoring data through matching codes. The system has the advantages that the hardware redundancy is reduced, the cost is low, the failure rate is low, and the space size is small.

The invention provides the design of a multifunctional infrared remote-control electronic password lock, and a singlechip is adopted as a core for design. The new type also has convenience, safety and reliability. A remote-control unlocking code has the characteristic of a pseudo-random number rolling code, carries out graded management for password modification authority and can effectively prevent a password from being copied and stolen. A main control circuit comprises a singlechip central control circuit, a power-failure automatic switching standby power supply circuit, an intelligent charging circuit, an infrared receiving circuit, a motor-driven circuit and a password storage circuit. The lock has the functions of intelligent remote control (remote-control password graded management and remote controller sectional management), emergency unlocking and the like, has multiple functions, wide application range, high practical value, small error rate and strong burglarproof function, is adapted to the field of intelligent locksets and is beneficial to the safe theft prevention of families and vehicles.

Abstract of the Disclosure <italic></highlight> A transmitter for operating a rolling code receiver is disclosed. A set of predetermined codes is captured from a rolling code transmitter that is used to actuate a corresponding rolling code receiver. The set of predetermined codes is stored in a memory of a transmitter. The transmitter, upon each actuation, transmits one or more codes of the set of predetermined codes to operate the rolling code receiver. The set of stored predetermined codes in the transmitter has fewer codes than a total number of unique codes that can be generated by the rolling code receiver.