无线遥控器怎样工作外文翻译(编辑修改稿)

无线遥控器怎样工作外文翻译(编辑修改稿)内容摘要：

ou release the volume up button) So when you press the volume up button on a Sony TV remote, it sends out a series of pulses that looks something like this: wireless remote control 45 Sony TV remotes use a spacecoding method in which the length of the spaces between pulses of light represent a one or a zero. When the infrared receiver on the TV picks up the signal from the remote and verifies from the address code that it39。 s supposed to carry out this mand, it converts the light pulses back into the electrical signal for 001 0010. It then passes this signal to the microprocessor, which goes about increasing the volume. The stop mand tells the microprocessor it can stop increasing the volume. Infrared remote controls work well enough to have stuck around for 25 years, but they do have some limitations related to the nature of infrared light. First, infrared remotes have a range of only about 30 feet (10 meters), and they require lineofsight. This means the infrared signal won39。 t transmit through walls or around corners you need a straight line to the device you39。 re trying to control. Also, infrared light is so ubiquitous that interference can be a problem with IR remotes. Just a few everyday infraredlight sources include sunlight, fluorescent bulbs and the human body. To avoid interference caused by other sources of infrared light, the infrared receiver on a TV only responds to a particular wavelength of infrared light, usually 980 nanometers. There are filters on the receiver that block out light at other wavelengths. Still, sunlight can confuse the receiver because it contains infrared light at the 980nm wavelength. To address this issue, the light from an IR remote control is typically modulated to a frequency not present in sunlight, and the receiver only responds to 西安交通大学城市学院本科生毕业设计（外文翻译） 46 980nm light modulated to that frequency. The system doesn39。 t work perfectly, but it does cut down a great deal on interference. While infrared remotes are the dominant technology in hometheater applications, there are other nichespecific remotes that work on radio waves instead of light waves. If you have a garagedoor opener, for instance, you have an RF remote. Remotecontrol Features Today39。 s hometheater remotes do a lot more than turn a ponent on and off and control the volume. Here are just a handful of the features you can find on some of the highertech remote controls out there. Universal capabilities Different electronics brands use different mand codes. Some IR remotes are preprogrammed with more than one manufacturer39。 s mand codes so they can operate multiple devices (sometimes up to 15) of different brands. If your hometheater setup incorporates ponents from, say, three different manufacturers, you can either use three different remotes to operate your system or use one universal remote. To add functions to a universal remote, you need to know the mand codes for the ponent you want to control. You can look these up online or find them in the manual that came with your remote. Learning A learning remote can receive and store codes transmitted by another remote control。 it can then transmit those codes to control the devi。