WO2010138118A1 - Système d'ouverture de barrière par télécommande à changement de canaux - Google Patents

Système d'ouverture de barrière par télécommande à changement de canaux Download PDF

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Publication number
WO2010138118A1
WO2010138118A1 PCT/US2009/045317 US2009045317W WO2010138118A1 WO 2010138118 A1 WO2010138118 A1 WO 2010138118A1 US 2009045317 W US2009045317 W US 2009045317W WO 2010138118 A1 WO2010138118 A1 WO 2010138118A1
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WO
WIPO (PCT)
Prior art keywords
channel
transmitter
receiver
copies
operatively connected
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Application number
PCT/US2009/045317
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English (en)
Inventor
Grant B. Carlson
Brett A. Reed
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Overhead Door Corporation
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Publication date
Application filed by Overhead Door Corporation filed Critical Overhead Door Corporation
Priority to PCT/US2009/045317 priority Critical patent/WO2010138118A1/fr
Publication of WO2010138118A1 publication Critical patent/WO2010138118A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Definitions

  • the present invention relates generally to remotely controlled barrier operator systems for opening and closing garage doors, gates and other barriers, and more particularly to improved wireless communication systems and methods for such barrier operator systems.
  • barrier operator systems such as those controlling upward acting sectional garage doors, so-called rollup doors, gates and other motor operated barriers, are remotely controlled devices.
  • they are remotely controlled by one or more building mounted or hand held wireless remote control devices such as radio frequency (RF) code transmitters.
  • RF radio frequency
  • RF transmitters upon actuation by the user, usually send access codes and commands, via packet data, to a radio frequency receiver associated with the barrier operator.
  • a controller unit also associated with the barrier operator then receives and decodes the data from the RF receiver.
  • the barrier operator Upon receiving and decoding the packet data, and verifying the access codes, the barrier operator then either opens, closes, or stops the barrier, depending upon the command.
  • the communication protocol between the remote RF transmitters and the RF receiver uses code-hopping encryption for the access codes, sometimes referred to as "rolling codes," to prevent code interception and unauthorized actuation of the barrier operator. Accordingly, the rolling code is transmitted as part of the packet data along a single fixed RF "channel.”
  • channel as used throughout the specification and claims, is meant the communication path between the RF transmitter and RF receiver along which the encoded primary RF signal travels. Each channel will accommodate inter alia a different main radio frequency signal along with any sidebands thereof.
  • the rolling or hopping code changes with each new transmission in accordance with a stored algorithm to prevent unauthorized capture of the codes, its security dependent upon the secrecy of the encryption algorithm and of the secret key.
  • a plurality of remote RF transmitters can be used to send the required access code and data to a single RF receiver integrated into the barrier operator, but in each case the transmission from each transmitter proceeds along its own single fixed RF channel.
  • the packet style data sent by the RF transmitters to the RF receiver is typically 58 to 69 bits, and tens to hundreds of milliseconds, in length, and the packet as a whole is repeatedly transmitted for as long as the user actuates the transmitter. Because these RF transmissions are sent on a fixed, single RF channel, RF noise in the channel causes reduced reception range, and the transmitter must often be actuated, and the packet data repeatedly transmitted, for extended periods of time to ensure the data is received. If the channel has heavy interference, then reception is completely blocked and the wireless system breaks down as the code- hopping scheme cannot mitigate RF noise in the channel.
  • the present invention is directed to channel switching remote controlled barrier operator systems, and methods of operation therefor, in which data packets are transmitted along alternately switched channels between the transmitter and receiver, to avoid the noise and interference of any one channel.
  • the system exhibits asynchronous wireless transmission and receipt of multiple copies of the transmitted data packets, for example, multiple copies of a packet containing a rolling code, alternatively switched between two or more radio frequency channels.
  • the transmitter transmits more than two copies of the data message on each of two channels, while cycling from one channel to another at a rate governed by the number of packets transmitted on each of the channels.
  • the receiver cycles through all of the channels at a rate faster than a rate at which the transmitter cycles from one channel to another.
  • the receiver tunes to each of the channels long enough to receive at least two sequentially transmitted copies of the message over each of the channels, or the barrier operator learns the transmitter by requiring receipt of at least two sequentially transmitted copies of the message on each of the channels, and thereafter responds to receipt of one copy of the message on any of the channels to initiate movement of the barrier.
  • receipt of packets from a previously learned single or dual channel transmitter can open a window of time for learning a different kind of transmitter.
  • a previously learned dual channel transmitter can open a window of time for learning a single channel transmitter, and vice versa.
  • FIGURE 2 is a block diagram of a receiver for use in the system of FIGURE 1.
  • FIGURE 3 is a block diagram of a wireless transmitter for use in the system of FIGURE 1.
  • FIGURE 4 is a typical hopping code data packet diagram.
  • FIGURE 5(a) is a typical RF transmitter timing diagram.
  • FIGURE 5(b) is a typical RF receiver timing diagram.
  • FIGURE 6(a) is a flow diagram illustrating a method of operation of a receiver for use in a channel switching remote controlled barrier operator system of FIGURE 1.
  • FIGURE 6(b) is a flow diagram illustrating a method of operation of a transmitter for use in a channel switching remote controlled barrier operator system like that of FIGURE 1.
  • FIGURE 6(c), including FIGURES 6(c)(i) — 6(c)(iii) is a flow diagram illustrating a method of operation whereby a receiver learns a transmitter for use in a channel switching remote controlled barrier operator system like that of FIGURE 1.
  • the following description contemplates an improved barrier operator system utilizing a wireless communication system which includes the transmission and reception of the packet of coded information, specifically a multibit rolling code, by RF channel switching.
  • Certain embodiments contemplate sending two or more redundant data packets on each RF channel prior to switching channels. Once the remote RF transmitter is released and activated again, the rolling code then changes and new redundant data packets are transmitted again over the same RF channels.
  • barrier operator systems that entail a learned code, where the receiver must receive two or more rolling code hopping data packets on all RF channels designated for channel switching before the transmitter can be learned to the receiver. In certain embodiments, however, once the transmitter is learned, the receiver only needs to receive just one valid data packet on any one of the RF channels before executing the transmitted command.
  • the RF receiver in its operating mode, can scan all of the two or more RF channels at a rate faster than the RF transmitter changes from one RF channel to the next RF channel. This practice ensures that the RF receiver will detect data packets on the first pass for that RF channel. Because the RF receiver scan rate is running asynchronously from the RF transmitter's channel switching, the RF receiver scan rate can be changed at any time to a new rate to allow the receiver to detect two or more of the redundant data packets for any one RF channel.
  • the advantages of the various embodiments of the invention are particularly relevant where multiple barrier operator systems are often found in commercial or industrial applications where the operators are in close proximity to one other.
  • the channel switching protocol improves transmission efficiency by better mitigating the effects of RF interference.
  • the disclosure further depicts how the channel switching protocol better mitigates out of band signals, making communication more robust.
  • the major functional blocks of the barrier operator system include a remote RF transmitter 7, a barrier operator 76, a barrier drive mechanism 84 and the barrier (door) 86.
  • a power supply 74 powers the components of the barrier operator 76.
  • Figure 1 shows only one of each type of device typically used in a movable barrier system, it should be understood that there could be multiples of any of the devices in a given application. For example, it is very common in both residential and industrial environments to have multiple operators moving multiple barriers.
  • the remote transmitter 7 can be of the handheld type, or an integral part of a wall module in the interior of the garage, or affixed to the exterior wall for keyless operation.
  • Wireless communication systems of this nature usually transmit in the ultra high frequency (UHF) range and use low cost means of modulation like ASK or FSK.
  • any carrier frequency could be used so long as it can support the transmitted data rate.
  • any modulation type can be used that can send the digital data required.
  • the remote transmitter 7 has a radiating element or antenna 36 and push button switches 8A and 8B that the user pushes to activate the remote RF transmitter 7 and send a command via a hopping code data packet associated with that push button.
  • the buttons are typically associated with opening and closing the barrier 86.
  • the barrier operator 76 includes an RF receiver 78, a main controller 80, and an electric motor 82 that powers the barrier 86 between the open and close positions via the drive mechanism 84.
  • hopping code data packets are sent by the transmitter 7 to the receiver 78 on one or more RF channels.
  • the contents of the transmitted hopping code data packets typically include the transmitter's identification code, push button command, and hopping code portion, as shown in Figure 4. Data packets are continuously sent for as long as the user presses and holds down push button 8A or 8B. Once the user releases the push button 8A or 8B, the transmission typically stops within a second.
  • the next push of the same button sends new data packets with the same transmitter's identification code and push button command, but with a different rolling code portion for security.
  • the transmitter automatically and alternately changes the frequency of transmission along the pre-determined frequency channels as the user holds down the push button. Depending upon the timing of the system, the packet length, and the length of hold on the push button, not all of the RF channels may be used for transmitting.
  • transmission stops when the user recognizes that the operator 76 has received the intended command sent by the transmitter 7. The user stops the transmission by simply taking his/her finger off the push button 8A or 8B.
  • the receiver 78 which receives the wireless data for the operator 76, is shown in greater detail in Figure 2.
  • Power supply 74 of the barrier operator supplies power from power source 73 to the receiver components.
  • one common type is a single conversion super heterodyne type as shown in Figure 2.
  • a single mixer or modulator 42 is used to down convert the RF signal to an intermediate frequency (IF) signal prior to amplification by the IF amplifier 52.
  • the RF signal is picked up by the antenna 38 and amplified by the low noise amplifier 40 before entering the modulator 42.
  • the modulator 42 requires a local RF oscillator signal 44 in order to perform the function of down conversion.
  • RF receivers receive signals from multiple incoming frequency channels by changing the frequency of the local RF oscillator 44 signal as the IF signal is produced by the mixing (multiplication) of the incoming RF signal and the local RF oscillator signal.
  • a band pass filter (BPF) 50 is typically used to filter out the unwanted signals produced by the multiplication effect.
  • the changing of the output frequency of the local RF oscillator 44 is performed by the frequency switching control circuit 46.
  • the control circuit 46 may be of any suitable construction, one suitable device being an electrical circuit device known as a phase lock loop.
  • Frequency stability of the RF oscillator may be controlled by a frequency stability device 48, which can be a crystal or SAW device, or alternatively, an LC tuned circuit.
  • channel switching may be accomplished by changing one or more counter values in a phase lock loop, if used.
  • the method of frequency change is irrelevant, but there must be some means of receiving the data, alternatively, over at least two different RF channels from the remote transmitter 7.
  • the ability to receive data communication on multiple channels provides a means to mitigate interference noise that may exist at the time on any one RF channel. As a whole, this technique makes the wireless communication more robust by helping ensure that the receiver 78 receives the intended hopping code data packet by way of a clear channel, free of interference.
  • the receiver 78 includes a demodulator circuit 54 (Fig. 2) for removing the IF carrier and revealing the hopping code data packet. As the data in the packet is recovered, the data is shifted into shift register 56. The controller 60, through the use of the decryptor 58, oscillator 64, and memory 62, performs the task of verifying that the data received is a valid command from an authorized transmitter. Once verified, the controller 60 then forwards the recovered button code to the main controller 80 in the operator 76 for processing (Fig. 1 ). The main controller 80 reads the button code and translates it to a command for the operator.
  • FIG. 3 An example of an RF transmitter 7 suitable for the present system is depicted in Figure 3. Accordingly, power supply 72 supplies power from a battery 70 to components of the transmitter.
  • the RF transmitter 7 has a radiating element or antenna 36, which is connected to a RF amplifier 32 by way of a matching circuit 34.
  • the RF signal to be transmitted is created in the modulator 22, which performs the act of multiplying the baseband data packet (shown in Figure 4) as created by the controller 12 (Fig. 2) together with a local RF oscillator 24.
  • RF oscillator 24 obtains its reference from a frequency stability device 28.
  • frequency stability devices can be crystals, SAW resonators, or an LC tuned circuit.
  • the capability of the transmitter 7 to switch frequency is performed by the frequency switching control circuit 26, which changes the frequency of the RF oscillator 24 in response to a control signal from the controller 12 or, alternatively, in response to the data signal which is also inputted to modulator 22.
  • the data signal can be used where the data packets to be transmitted can be distinguished from one another in a way such that they can be counted.
  • the frequency switching control circuit 26 needs only to count the requisite number of data packets being generated by the controller 12 and then automatically switch frequencies.
  • the RF transmitter 7 (Fig. 2) also uses an oscillator 10 (Fig. 3) to create a clock for the controller 12.
  • the encoder 18 and the shift register 20 are needed to properly assemble the hopping code data packets and prepare them to be modulated onto an RF carrier by the modulator 22.
  • FIG. 4 schematically illustrates the structure of a typical hopping code data packet.
  • the packet has five different sections, namely the preamble 90, the header 92, the encrypted rolling or hopping code portion 94, the fixed portion 96, and the guard time portion 98.
  • the preamble 90 typically comprises a short series of pulses used to set up the receiver's data slicers (not shown) in the demodulator 54 (Fig. 2).
  • the header 92 (Fig. 4) is a period of time in which there are zero pulses, prior to the commencement of the data portion of the packet.
  • Following the header 92 are the encrypted portion 94 and fixed (non-encrypted) portion 96.
  • the guard time 98 is the increment of time before another packet can be sent.
  • Guard time 98 can also be described as the time between packets and can be as long or longer in time as all four previous sections combined.
  • Microchip Technology Incorporated a corporation having its principal place of business in Chandler, Arizona, has a hopping code data format that is part of their Keeloq system that is 66-bits in the payload section, with a total packet time of 100 msecs, yet the guard time is about 50 msecs.
  • Keeloq systems are usually pulse width modulated systems with bit symbol times of 600 usec.
  • Linx Technologies has a hopping code system called "CypherLinx," in which the data to be transmitted is combined with a 40-bit counter and 80 bits of integrity protection before being encrypted to produce a 128- bit packet. Guard times between CypherLinx packets are shorter than Keeloq (e.g., typically less than l Omsecs).
  • the transmitter is keyed by the user to send out redundant data packets which contain the transmitter's identification number and secret decryption key.
  • the RF receiver 76 then stores these numbers into its memory 62 (Fig. 2).
  • the RF receiver 76 (Fig. 1 ), which shares the same secret key, has now learned the remote RF transmitter 7.
  • the receiver learns other remotes by repeating the same process.
  • the learning process of code hopping systems like Keeloq and CypherLinx, are typically performed on one carrier radio frequency of operation and implemented without regard to the number of redundant packets being sent by the transmitter.
  • the receiver upon learning a transmitter, typically exits the learn mode and then automatically returns back to its normal operating mode.
  • the receiver while in the "learn mode,” receives valid data packets on two or more of the channels on which the remote transmitter is transmitting because the disclosed transmitter is switching frequencies asynchronously.
  • two or more valid data packets must be received on each RF channel before a transmitter can be learned to the receiver. This requirement greatly improves the robustness of the one way wireless communication system during the learn mode. It is possible, however, and desirable, at times, to allow the learning of a single channel transmitter to a receiver immediately after learning a switching transmitter to that same receiver. This learning may need to be performed at close range and within a short window of time.
  • Another characteristic of certain embodiments of the disclosed system is the ratio of the scanning rate of the receiver to the switching times of the transmitter.
  • the receiver scans all transmitter channels with a rate as fast or faster than a transmitter dwells on one channel and while switching to the next. It is also envisioned that, once out of the learn mode, the receiver only needs to receive a single valid data packet on any one of the transmitter RF channels to process the command in the data packet.
  • FIG. 5(a) An example of a receiver-scanning rate based upon a transmitter- switching rate is depicted in Figure 5.
  • the transmitter is switching between two RF channels shown as frequencies F1 and F2.
  • the transmitter is also sending five data packets, each with a length of 100 msec on both frequencies.
  • the transmitter sends five 100 msec data packets on frequency F1 , followed by five more 100 msec data packets on frequency F2, for a total two- channel transmission time of 1 second.
  • the transmitter continues sending packets in this way until the button on the transmitter is released or until a period of predetermined transmission times out, or some combination of both.
  • the receiver scans or switches both channels within the dwell period of five data packets or, in this case, a total of 500 msec.
  • Fig. 5(b) shows the receiver scan rate with a dwell time of 200 msec for frequency F1 , followed by 200 msec of dwell time for F2, before going back to F1. The receiver repeats this scanning rate between the two frequencies until it detects a data packet on one of the two channel frequencies.
  • the receiver will dwell on a frequency once data is sensed on that frequency.
  • the receiver can dwell on that frequency until such time that full data packets are received and a proper decode can be made. If the receiver determines that the signal is not a valid data packet from a learned transmitter, the receiver can then revert back to its normal scanning rate. If the receiver cannot correctly read and recognize the incoming baud rate or see the appropriate time of the header (e.g., header time of zeros), the receiver can again return back to its normal scanning rate.
  • Figure 6 methods of operation for various components of a channel switching remote controlled barrier opening system are provided.
  • Figures 6(a) and 6(b) respectively provide methods of operation for a barrier operator receiver unit and a remote control transmitter unit.
  • Figure 6(c) provides a method of operation for the receiver unit to learn a dual frequency transmitter in response to pressing of a learn button, for example, on the barrier operator head unit, wall unit, or remote control unit, followed by receipt of valid packets from the transmitter on multiple frequencies.
  • Figure 6(c) also provides a method of operation whereby the receiver unit can respond to actuation of the learn button and receipt of packets from a previously learned, multiple frequency transmitter by opening a window of time in which another type of transmitter, such as a legacy, single frequency, transmitter, can be learned by the receiver upon receipt of packets from that transmitter.
  • another type of transmitter such as a legacy, single frequency, transmitter
  • the method of operation for the receiver unit begins with powering on of the receiver at step 600.
  • the reception frequency is then set to a first channel at step 602, and the receiver samples that channel looking for packet data. If it is determined at step 606 that valid packet data has been received, then the valid packet data is decoded at step 608, a corresponding function command is output at step 610, and processing returns to step 602.
  • outputting of the function command at step 610 can cause the barrier operator to initiate movement of the barrier.
  • the reception frequency is set to a second channel at step 614. Then, the receiver samples the second channel looking for valid packet data at step 616. If it is determined that valid packet data has been received at step 618, then processing proceeds to step 608. However, if another dwell period times out at step 620 before receipt of valid packet data has occurred, then processing returns to step 602.
  • dwell periods are periods of time for the receiver to dwell on a channel, and that these dwell periods can be different in length or identical in length. These dwell periods can also be predetermined or dynamically determined. In some embodiments, the dwell periods can be predetermined to be long enough to ensure opportunity to receive at least two copies of a packet transmittable over a channel by remote control transmitter devices of a target category, and not equal to an amount of time required by the remote control transmitter devices of the target category to transmit a predetermined number of copies of the packet on a channel before switching to another channel. In alternative or additional embodiments, the dwell periods can be predetermined to ensure that the receiver cycles through all of the multiple channels at a rate faster than the transmitter cycles from the current one of the multiple channels to the next one of the multiple channels.
  • the method of operation for the transmitter device begins at step 622, in which the push button press is detected.
  • a number of data packets are generated at step 624 and sent to the transmitter at step 626.
  • a predetermined integer number of identical packets greater than or equal to two can be generated. For example, five identical packets can be generated.
  • the transmitter sets the output frequency to a first channel at step 628, and the packets are transmitted over that channel at step 630.
  • the transmitter sets the output frequency to a next channel at step 632, and the transmitter transmits the packets over the next channel at step 634.
  • processing returns to step 628. Otherwise, the method ends.
  • two channels are demonstrated, it should be readily understood that additional channels can be included for transmission of the two or more identical packets over each of the channels in sequence.
  • an embodiment of the transmitter can transmit five identical packets on one channel, transmit the five identical packets on another channel, and then cycle between the two channels as long as the transmitter button is actuated.
  • the receiver can receive over each of the two channels for a period of time long enough to receive two packets over each of the two channel, but not long enough to receive two and one-half packets over each of the two channels.
  • the receiver cycles through the set of channels at a rate faster than is required for the transmitter to transmit all five packets over one of the channels.
  • the receiver will have an opportunity to receive two or more packets over the channel being utilized by the transmitter before the transmitter switches to the next channel.
  • the method of learning transmitters to a channel switching receiver unit begins at step 638 with powering on of the receiver.
  • the receiver enters the scanning at step 640.
  • This scanning mode proceeds according to the method of Figure 6(a). However, if a learn button press is detected at step 642, then a learning mode is entered at step 644. Then, a predetermined integer number of two or more identical packets can be received on a channel at step 646. However, if a learning period expires at step 648 before receipt of the predetermined number of packets on the channel, then the learning mode ends at step 668, error is signaled at step 670, and processing return to step 640.
  • transmitter information of the packets is stored in memory at step 652.
  • the transmitter information is removed from memory at step 666, the learn mode is ended at step 668, error is signaled at step 670, and processing returns to step 640. Otherwise, a transmitter learn confirm mode is entered at step 672.
  • the learn mode is ended at step 684, and processing returns to step 640. Otherwise, if the learn period expires or if the transmitter information is not correct, then transmitter information is removed from memory at step 666, the learn mode ends at step 668, error is signaled at step 670, and processing returns to step 640.
  • a window is opened at step 686 for learning of a different kind of transmitter, such as a legacy, single-frequency transmitter.
  • the combination of a learn button press and press of a button on a previously learned channel switching transmitter authorizes, for a period of time, learning of a different kind of transmitter.
  • the receiver enters a scanning mode at step 688 to look for valid packet data on any of multiple channels over which the transmitter might transmit. If valid packet data is not received on one of the channels at step 690 before expiration of a learn period at step 692, then an error is signaled at step 694, and processing returns to step 640. Otherwise, the transmitter information from the valid packet data is stored in the memory at step 696, the receiver reenters scanning mode to look for a second transmitter actuation at step 698, and the receiver enters a transmitter learn confirm mode at step 700.
  • the receiver is looking for packets that are different from those previously received because they contain a different rolling code, but that nevertherless contain the same transmitter information.
  • transmitter information is removed from memory at step 666, the learn mode ends at step 668, error is signaled at step 670, and processing returns to step 640. Otherwise, the transmitter information is written into permanent memory at step 708, and a learn confirm signal is generated at step 710. Afterwards, the learn mode ends at step 712, and processing returns to step 640.
  • a channel switching transmitter can only be learned if the learn button is pressed, valid packets are received from the transmitter on more than one channel, and valid packets are again received from a second actuation of the same transmitter on at least one channel. In some embodiments, determining that the packets are valid might require that at least two packets be received over each channel. It should also be understood that the single channel transmitter can only be learned if the learn button is pressed, valid packets are first received from a previously learned transmitter, and valid packets are subsequently received from two actuations of the new transmitter. Thereafter, the receiver can scan multiple frequencies and output commands received over any one of the channels from either type of transmitter. However, the channel switching transmitter can have an advantage over the single channel transmitter in successfully delivering packets to the receiver even when there is interference on the channel utilized by the single channel transmitter.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un système amélioré de communication sans fil unidirectionnelle pour porte formant barrière, destiné à actionner une barrière, comme une porte de garage, comprenant l'émission et la réception de paquets de données multi-bits à saut de code en combinaison avec un changement automatique de canaux RF. Les données par paquets sont émises automatiquement sur plusieurs canaux RF de manière commutée tout en envoyant au moins deux paquets de données multi-bits à saut de code redondants sur chacun des canaux RF. Le système permet également une étape consistant à faire acquérir par apprentissage un émetteur par un récepteur, nécessitant la réception d'au moins deux paquets de données à saut de code et leur décodage par le récepteur sur tous les canaux RF avant qu'un récepteur puisse acquérir un émetteur. Une fois l'émetteur acquis, l'activation de l'émetteur en mode d'apprentissage peut ouvrir une fenêtre pour l'apprentissage d'un émetteur monocanal.
PCT/US2009/045317 2009-05-27 2009-05-27 Système d'ouverture de barrière par télécommande à changement de canaux WO2010138118A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040052374A1 (en) * 2002-08-30 2004-03-18 Holltek Semiconductor Inc. High-security encoding device for remote controller
US20060181428A1 (en) * 2003-02-21 2006-08-17 Johnson Controls Technology Company Trainable remote controller and method for determining the frequency of a learned control signal
US20070152798A1 (en) * 2006-01-03 2007-07-05 Johnson Control Technology Company Transmitter and method for transmitting an RF control signal
US20080079603A1 (en) * 2006-09-28 2008-04-03 Lear Corporation System and method for remote activation with interleaved modulation protocol
US20090021348A1 (en) * 1995-05-17 2009-01-22 The Chamberlain Group, Inc. Rolling code security system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090021348A1 (en) * 1995-05-17 2009-01-22 The Chamberlain Group, Inc. Rolling code security system
US20040052374A1 (en) * 2002-08-30 2004-03-18 Holltek Semiconductor Inc. High-security encoding device for remote controller
US20060181428A1 (en) * 2003-02-21 2006-08-17 Johnson Controls Technology Company Trainable remote controller and method for determining the frequency of a learned control signal
US20070152798A1 (en) * 2006-01-03 2007-07-05 Johnson Control Technology Company Transmitter and method for transmitting an RF control signal
US20080079603A1 (en) * 2006-09-28 2008-04-03 Lear Corporation System and method for remote activation with interleaved modulation protocol

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