Remote control
A remote control is a device that enables a user, by actuation of a button on a handheld transmitter, to remotely control an electronic device. A remote control device designed for one apparatus has a function to send out, according to user operations such as pressing of a button, an infrared or radio frequency (RF) remote control signal having a waveform predetermined as a command for controlling the apparatus. Remote control devices are finding varied uses for controlling one or more functions of electronic devices. A variety of consumer electronics e.g., televisions, computers, radios, audio receivers, audio cassette decks, turn tables, compact disc (CD) players, video cassette records (VCRs), digital video disc (DVD) players, satellite receivers, cable boxes, other audio and/or video equipment, electronic appliances, and lighting fixtures come equipped with wireless remote controls. A remote control typically includes a keypad comprising a plurality of physical buttons or keys. The keypad is used by a user to effect wireless remote operation of the corresponding device, e.g., via an infrared or radio frequency interface. A remote control device comprises a transmitter having a single button to activate the transmitter. When the button is activated, the transmitter, using energy, such as, but not limited to radio frequency and infrared energy, transmits a transmitter identification (ID) code that is unique to the transmitter. A receiver, interconnected with the component to be activated, determines whether or not the received ID code matches a code that has been stored in the memory of the receiver beforehand. When a match is determined to exist between the codes, a predetermined function of a device to be controlled is activated. Infrared LEDs are the most common communication means, particularly because the infrared wavelength is invisible to the human eye, but requires line-of-sight between the remote control and the photodetector of the consumer electronics. Some remote controls utilize radio frequency (RF) communication, which eliminates the line-of-sight requirements of infrared devices, and typically allows a greater range between the remote control device and the consumer device. Many remote controls included with consumer electronics are designed to operate only the specific device or devices that they accompany. In order to eliminate the need for multiple remote control units, universal remote control units have been developed. The universal remote control unit has a plurality of operating modes for controlling a plurality of devices. Each operating mode enables the user to remotely control a corresponding device. Typically, universal remote control units include a memory which stores signal formatting data of different manufacturers which identify the signal structure to which specific manufacturer and model number devices are responsive. These signal formatting data commonly vary based on the device which is to be controlled.
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