[BC] For the TV guys for Cowboy

Ira Wilner bdcst at vermontel.net
Fri Jul 11 11:47:48 CDT 2014


I thought it was the bits per Hz that counted most.  If you assume the same 
data rate, but just a smaller number of bits for a smaller picture, then 
both streams will suffer from the same SNR for the symbols being 
transmitted.  If the symbol rate is different, there will be a reception 
noise floor difference.  I assume all of the DTV data is transmitted as one 
stream that is subdivided among each video program feed according to video 
format requirements and amount of compression for each program.  A more 
highly compressed feed would be more susceptible to unmaskable errors as 
well as more artifacting in general but the symbol rate per carrier Hz would 
be reduced for all of the programming that share the digital carrier thus 
increasing the SNR in the RF domain.

--Ira

From: jimsnell*aol.com.INVALID

WOIO RF Channel is 10.

19.1 is 1080 I
19.2 is 480 I



More information about the Broadcast mailing list