Despite the rapid development of smart devices like mobile phonesTelevisionIt's still a household necessityRemote controlAs a control device for television, people can switch television channels without any effort. How can remote controls be achieved
As technology advances, so does the type of wireless remote control. There are usually two kinds of thingsInfraredThe remote, the other is the radio rock control mode. In our daily lives, the most widely applied is the infrared remote control model, for example, television remote control, where we talk about the principles of our work。
The remote control system is typically composed of three parts: a transmitter (telecontroller), a receiver and a central processor (cpu), all of which are on television. The general television remote control device, which uses an infrared wavelength of 0. 76 ~1. 5 Μm to launch control information, works at a distance of 0-6 m and is distributed along a straight line. In the circuit inside the remote, each key corresponding to the remote control is matched by a specific code. When a particular key is pressed, one of the circuits is connected, and the chip can detect which circuit is connected and determine which key is pressed. The chip will then send a coded sequence signal corresponding to the key, which, after magnification and modulation, will be sent to the light diode and converted to infrared radiation. The television receiver receives an infrared signal which has been dereduced, restores the control signal and sends it to the central processor, where it is replaced by a central processor. As a result, we have remote control of television。
There are many advantages to infrared remote control. First, the cost of infrared remote control is lower and is more acceptable to the general public. Second, the infrared remote control does not have an impact on the surrounding environment and there is no interference with its electrical appliances, and even domestic appliances in different houses can use the same type of remote control because the infrared remote control cannot penetrate walls, so there is no interference. Finally, the remote-controlled system is simple to debug, and usually we can use it without any debugging, as long as the correct connection is made on the specified circuit. So, infrared remotes are widely used in our home appliances。
WithSmart ageWhile televisions are becoming more and more diverse, remote controls are becoming simpler, less than previously excessive buttons, and more humane, but, however developed, remote controls are inevitably irreplaceable as important devices for human interaction。
This paper was presented by zhang zhongbao, associate professor of computer science and technology, beijing post and telecommunications university, for scientific clearance。
