Frequency 3/4, 5/6, 7/8 etc....

[MOLOYBORA]

What is the meaning of 3/4, 5/6 & 7/8 frequency.

7/8 frequency catch to very hard.....

Explain if anybody.......

 

[srinivas33]

That number is called Forward Error Correction(FEC), If noise interferes the signal, the lost signal is lost, but if we apply error correction codes, there is no need to request for retransmission of signal as it is not possible in case of TV transmission.

 

[Shubham]

3/4 means : 3 bit message & 4th bit is used for correction.

 

[me_saket]

Nicely explained by Shubham

In other term.

If we recieve 100 bits data

With 3/4 we receive only 75 bits data as information other is not converted to picture or audio, but when low signal problem occur those 25 bits would be useful to recover remaking 75 bits and we see sustainable quality

When 100 bit data with 7/8

Then 88 bit data gets converted to information like picture and audio,

And remaking 12 bit useful when signal low happens.

Thus DTH operator try to in increase fec rate to 7/8 so that maximum bandwidth gets utilized for picture and audio

But same time operator receives many complaints regarding lost signal or poor pq or aq

But

Sent from my Connect-2G-2.0

 

[NinadG]

I think only TS is using 7/8 fec....

 

[Rushil]

I think only TS is using 7/8 fec....

Bro Tata Sky Uses Differt FEC 3/4,5/6 And 7/8 Only for dvbs mpeg2 transponders

 

[MOLOYBORA]

Thanks to All friends,

But sometimes 7/8 frequency received in very hard. 3/4, 5/6 easily catch. Is it right??? Frequency is depends regarding signal quality. Which type of frequency is better for easily catch in the receiver.

 

[MOLOYBORA]

I can not received from INSAT-4A (83*) TP 3958-H-9500, i.e. 7/8 Feq.....

Why??? High Frequency Reason or other problem????