mystic said:
Notes about FEC formula :
If FEC is not accurate you may see cracked pictures during high motion scene ......
Forward error correction (FEC) is a method of obtaining error control in data transmission in which the source (transmitter) sends redundant data and the destination (receiver) recognizes only the portion of the data that contains no apparent errors. a digital information source sends a data sequence comprising k bits of data to an encoder. The encoder inserts redundant (or parity) bits, thereby outputting a longer sequence of n code bits called a codeword. On the receiving end, codewords are used by a suitable decoder to extract the original data sequence.
Well in simple terms, we can roughly say some crude explanation like this
the FEC tells the decoder , to take the right frames from the stream, The satellite with fec 3/4 for example , transmits each frame four times, If 3 frames are identical, they are taken as correct and the frame with error is simply discarded, The more values of fec like 5/6 or 7/8 , makes it harder for Fringe reception etc...,
Please remember that this along with things like C/N ratio, BER and a lot more things like rain outage, atmospheric conditions, etc.... etc... are all contributing to your PQ and AQ
How? Please expain. I am getting good signal without any BER. Now if I see square boxes during fast moving scenes then it is the mistake of FEC?
Dont really think so, We had an old lcd tv a few years back, with a high response time, So if Schumacher turns a bend in Monaco, the car looked like a snake curling around, That is a slow grey to grey of TV, Well if the STB is a little on the slow processing side or is overheating these artifacts start appearing too, Like the video section memory is slower and lot of data is input to it, the output can give strange results, Like squares and flower pots
