LNB OR Response Time

· LNB
LCD TV tuner, the official name is called tuner (tuner), is a television capable of receiving broadcast television signals, cable key device .

Traditional analog TV tuner is a complete analog receiver amplification, gating , frequency , Figure sound demodulation process , if there are aberrations and distortion which will make the received image and sound quality deteriorates . LCD televisions are digital television , the first analog television signal is changed to digital signal compression, transmission, reception , processing, storage , recording and control of receiving terminal via the digital TV tuner to a high frequency amplification, comparison processing , channel decoding and demodulation , and then back through the receiver circuit source decoding processing such as a restored image and sound , which occurs if the distortion error will cause an error , in excess of the range of the tuner can be regulated , can not receive the image and sound .

Digital tuner includes not only an important indicator of the original traditional TV , the phase noise, nonlinear index and lock time and other detection methods also a great difference . Analog TV tuner receives an analog television signal , the number of different high frequency television signal is converted into a fixed frequency output , moving to complete the spectrum . LCD TV tuner to receive digital broadcast television signals , not only to complete the analog tuner to be accomplished by spectrum shifting function, but also complete demodulation and channel decoding. The front end of a digital television receiver , a digital TV tuner digital device , so that in the production process than the analog tuner easy assembly and adjustment , the reliability and stability is greatly improved . Therefore, the digital tuner in technology and processes , there are many different characteristics of analog TV tuner , its performance is much better than analog TV tuner.

LNB performance on cable television signal reception quality of the system a great influence on the electrical properties should be selected high gain, low noise temperature coefficient tuner, tuner poor quality in different climatic conditions produce environments frequency drift caused treadmill phenomenon , so buy high frequency stability tuner to ensure system stability. custom lcd display Tuner band received signal is divided into VHF VHF (Very High Frequency) and UHF UHF (Ultra High Frequency) , the former for the frequency range of 30MHz-300MHz frequency band, which is the frequency range of 300MHz-3GHz bands. A tuner can receive only 1 channel cable TV signal , only with dual tuner LCD TV to be able to simultaneously receive two different television signals to be able to achieve two different channels of dual-screen display.

Response time

The response time of the LCD TV (response time) is a liquid crystal television is an important performance index , also called the response speed , the unit is typically milliseconds (ms), refers to the LCD TV input signal of each pixel reaction rate , that is, pixel from dark turn on or turn dark by the light of the time required . Since the liquid crystal in the display is driven by the voltage through the liquid crystal molecules resulting in deflection of different transmission rate, to achieve different degrees of light transmission and then to be composed of dots of different colors and then the entire screen , wherein the liquid crystal molecules is deflected by a voltage drive physical reaction process , take some time to complete, so the lcd module TV to get the signal in every point , the need for a certain time to change the yawing motion of the screen .