外文文献及翻译：红外遥控及芯片介绍

外文文献及翻译：红外遥控及芯片介绍内容摘要：

ared receiving product packages generally has two kinds: one kind USES sheet shielding, A kind of plastic packaging. There are three pin, namely the power is (VDD), power negative (GND) and data output (VO or OUT). Infrared receiving head foot arrangement for types varied, manufacturer39。 s instructions. Finished the advantages of infrared receiving head is not in need of sophisticated debugging and shell screen, use rise as a transistor, very convenient. But when used in the infrared receiving attention finished first carrier frequency. Infrared remote mon carrier frequency for 38kHz, this is transmitted by using 455kHz TaoZhen to decide. At the launch of crystals were integer frequency, frequency coefficients, so monly 12, so 455kHz 247。 12 hundredth kHz 38kHz hundredth 379,000. Some remote control system adopts 36kHz, 56kHz, etc, general 40kHz launched by the crystals of oscillation frequency to decide. Infrared remote characteristic is not influence the surrounding environment and does not interfere with other electric equipment. Due to its cannot perate walls, so the room can use mon household appliance of remote control without mutual interference, Circuit testing is simple, as long as given circuit connection, generally does not need any missioning can work, Decoding easily, can undertake multiple remote control. Because each manufacturer produces a great deal of infrared remote applicationspecific integrated circuit, when need press diagram suo ji. Therefore, the infrared remote now in household appliances, indoor close (less than 10 meters) in the remote control is widely used. Multiple infrared remote control system of infrared emission control buttons, there are many parts general representative of different control function. When pressed a button, correspondingly in the receiver with different output. Receiving the output state can be roughly divided into pulse, level, selflocking and interlock, data five forms. The pulse output is according to launch when the button, the receiver output terminals output corresponding effective, a pulse width 100ms in general. Level refers to the output launch press button, the receiver output corresponding output level , effective transmit to loosen the receiver level disappears. This effective pulse and effective, may be of high level is low, and may also depend on the output corresponding static state, such as feet for low, static high for effective, As for the static, low high effective. In most cases, high for effective. Since the lock refers to launch the output of each time you press the button, a receiver output corresponding change, namely originally a state for high level into a low level, originally for low level into high level. The output power switch and mute as control etc. Sometimes also called the output form for invert. The interlock refers to multiple outputs each output, at the same time only one output. The TV sets of this case is selected, the other is like the light and sound input speed, etc. Data refers to launch the output some key, use a few output form a binary number, to represent different keystroke. Normally, the receiver except a few data output, but also a valid output data, so the timely to collect data. This output form with singlechip microputer or are monly used interface. In addition to the above output form outside, still have a latch and temporary two forms. The socalled latch refers to launch the output signal of each hair, the receiver output corresponding , new store until you receive signals. Temporary output and the introduction of level output is similar. Remote distance (Remote Control effect of RF Remote Control distance) are the major factors as follows: 1, launched in power transmission power: while distance, but great power consumption, easy to generate interference, 2 and receiving the receiver sensitivity, receiving, remote distance increased sensitivity to improve, but easy to cause disturbance maloperation or abuse, 3, antenna, using linear antenna, and parallel, remote distance, but occupies a large space, in use the antenna spin, pull can increase the remote distance, 4 and the higher height: antenna, remote farther, but by objective conditions, 5 and stop: current use of wireless remote use of UHF band stipulated by the state, the propagation characteristics of approximate linear transmission, light, small, tran。