Originally Posted by 300ohm
I wonder why they didnt make that mandatory originally ? With digital transmission, thats exactly what is needed. Just think back when modems didnt have error correction, heh.
I don't know if you are thinking that ATSC does not require error correction or not but this is not the same as modems not having error correction since the ATSC standard for digital transmissions does mandate error correction.
What is being discussed here is the "extra" error correction which is optional in ATSC-E. If digital transmissions did not have error correction at all then you would have to have a 100% signal quality for undisturbed viewing.
About 1/3 of the data in ATSC transmissions is forward error correction (FEC) data. ATSC has an FEC of 2/3 which means only about two-thirds of the data transmitted is the main signal and 1/3 is used for error correction.