The accurate positioning of the infrared remote control is not achieved through the traditional positioning technology, but through its unique signal encoding and decoding methods to ensure the accurate transmission and identification of the signal. An infrared remote control controls a TV or other device by emitting a specific coded infrared signal, and the way these signals are encoded determines how accurate their “positioning” is.
First of all, the infrared remote control is equipped with an infrared light-emitting diode (LED), when the user presses the button on the remote control, the LED will emit different infrared coded signals according to the different buttons. These signals are a series of pulses, each with a specific duration and interval, forming a kind of code. For example, in NEC coding, the duration and interval of a pulse can represent a binary “0” or “1” to form a complete signal sequence.
The accurate positioning of the infrared remote control depends on the following aspects:
- Uniqueness of coding: The coding of each button is unique, so that the receiver can accurately identify which button is pressed. This encoding is similar to a cipher that can only be correctly decoded by a matching receiver.
- Signal modulation and demodulation: The infrared remote control adopts the mode of modulation when transmitting the signal, and the data and the carrier of a certain frequency are “and” operation, which can improve the transmission efficiency and reduce the power consumption. The receiver enters the comparator through the demodulation circuit and the integrated circuit, and the comparator outputs the high and low level and restores the signal waveform at the transmitting end.
Signal stability: Although the signal transmission of the infrared remote control can not pass through obstacles, it has high stability and anti-interference ability in the range of visual range. This is because infrared signals travel in a straight line and are not susceptible to interference from the surrounding environment.
For example, when you press the Volume + button in front of the TV with an infrared remote control, the remote will emit a series of specific infrared pulses. These pulses are captured and decoded by the TV’s infrared receiver, and the TV’s built-in circuitry recognizes this as an instruction to increase the volume and performs the corresponding action. If there are no obstacles between the remote control and the TV, this signal transmission is very accurate and can be done almost instantaneously.
In general, the “accurate positioning” of the infrared remote control is actually achieved through its unique signal encoding and decoding methods. Although it does not have the positioning function in the traditional sense, within its scope of work, it can control the target device very accurately. The application of this technology is very wide, from home entertainment equipment to industrial control systems, you can see the infrared remote control figure.