Telecommunications – Radiotelephone system – Programming control
Reexamination Certificate
1998-09-15
2001-02-13
Tsang, Fan (Department: 2746)
Telecommunications
Radiotelephone system
Programming control
C341S176000, C340S870030, C340S870030, C348S734000, C359S199200, C455S092000, C455S352000
Reexamination Certificate
active
06188889
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved structure of radio transmitter, and more particularly to such a radio transmitter which provides a learning function for duplicating other radio transmitters.
The base principle of the control of a remote controller is as follows: the transmitter produces a particular serial code subject to the setting of a set of key switches, the serial code is then transmitted to a remote receiver by means of a carrier medium (for example, infrared or radio) and then decoded by the receiver for operation control. Regular commercially available radio transmitters have no learning function. Therefore, if a person has three different radio remote control systems, three different transmitters are needed. Providing an infrared remote control system with a learning function can easily be achieved by installing a microcomputer capable of reading and memorizing encoding signal of other transmitters in the transmitter of the infrared remote control system and adding an infrared receiving element in the receiver of the infrared remote control system. However, it is difficult to provide a radio remote control system with a learning function because the signal encoding procedure is complicated and an identification code must be added for identification. A signal can be transmitted through the transmitter of a radio remote control system only when it is modulated by a high frequency carrier wave. Therefore, a transmitter with a learning function must have a radio receiving demodulating circuit. However, when learning, the frequency of the radio receiving demodulating circuit must be adjusted by an instrument. The transmitter of a radio remote control system generally comprises an encoder having pins at the data line thereof, and a set of control buttons respectively connected to the pins of the data line of the encoder, each control button define a particular control code, which determines the control function of the transmitter, and setting switch for example a DIP switch for setting an identification code. When power supply is connected, the encoder provides a serial code subject to the setting of the control buttons. In an infrared remote control system, the transmitter provides only function code but not identification code, and serial code directly drives an infrared diode to transmit the signal. In a radio remote control system, serial code is connected to a modulation and radio transmitting circuit.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a radio transmitter for a radio remote control system which has a learning function for duplication of other transmitters for use in different radio remote control systems. The learning function enables the user to combine the transmitters of different radio remote control systems (garage remote control system, community gate remote control system, automobile remote control alarm system, home remote control alarm system) into a unit, so that one radio transmitter can be used to control a set of radio remote control systems. According to the present invention, the radio transmitter comprises a single chip microcomputer which controls the operation of the radio transmitter, enabling the radio transmitter to provide a receiving learning mode and a remote control transmitting mode, the single chip microcomputer having a set of input terminals and a set of output terminals; memory means for example EEPROM controlled by the single chip microcomputer to receive encoding data from the single chip microcomputer when the radio transmitter is set into the receiving learning mode, or to output stored data to the single chip microcomputer when the radio transmitter is set into the remote control transmitting mode; a function control key pad, the function control key pad comprising a set of key switches respectively connected to the input terminals of the single chip microcomputer and set by the user to provide a set of combinations for different function controls; a mode selector switch connected to one input terminal of the single chip microcomputer for selection between said receiving learning mode and the remote control transmitting mode; an encoding signal input circuit, the encoding signal input circuit comprising a transistor having the collector thereof connected to one input terminal of the single chip microcomputer for outputting encoding signal from the encoding signal input circuit to the single chip microcomputer; and a transceiver having an input terminal controlled by a serial code signal from the single chip microcomputer and an output terminal connected to the base of the transistor of the encoding signal circuit. When the receiving learning mode is selected, the single chip microcomputer reads in encoding signal from the transistor of the encoding signal input circuit and stores it in an address in the memory means subject to the setting of the key switches of the key pad. When the remote control transmitting mode is selected, the single chip microcomputer fetches encoding signal from the memory means subject to the setting of the key switches of the key pad and outputs fetched encoding signal to the transceiver for transmitting into the air. The invention also provides a method of duplicating a master transmitter from a transmitter to be duplicated through the receiving learning mode and then driving the master transmitter to transmit signal by remote control. The method comprises the first step of moving the master transmitter close to the transmitter to be duplicated when set in the receiving learning mode, then operating the master transmitter to transmit a signal, and then adjust the transceiver of the master transmitter, enabling the intensity of light of the LED indicator of the tuning indication circuit of the master transmitter to reach the maximum level, the second step of switching the mode selector switch of the master transmitter to the position of the receiving learning mode, enabling the single chip microcomputer to read in series encoding signal from the transistor of the encoding signal input circuit, the third step of enabling the single chip microcomputer to store received series encoding signal in the corresponding address in the memory means subject to the setting of the set of key switches of the key pad, and the fourth step of switching the mode selector switch of the master transmitter to the remote control transmitting mode, enabling the single chip microcomputer to fetch corresponding serial code from the memory means subject to the setting of the key switches of the key pad and then to send fetched serial code through the transceiver for transmitting into the air.
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Perez-Gutierrez Rafael
Rosenberg , Klein & Lee
Tsang Fan
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