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Originally Posted by RoyGBiv /forum/post/16987635
The vast majority of local signals are sent by cable (usually fiber) to a central station where they are then sent by satellite to D*'s main facility and being recoded (from MPEG2 to MPEG4) go from there back to satellite to your receiver. I understand that in some cases D* uses an antenna to receive the signal, but I believe that fiber is the norm.
Originally Posted by AntAltMike /forum/post/16988082
As I understand it, it is the responsibility of the broadcast station to get its signal to the DirecTV Point of Presence.
Originally Posted by Ken H /forum/post/16992026
Not what I've been told.
Originally Posted by AntAltMike /forum/post/16992178
The rules regarding DBS carriage of locals were intended to replicate those regarding cable TV, as closely as possible. als.
Originally Posted by John Mason /forum/post/16992357
So if stations are responsible for getting their signals to cable/DBS pickup points, how many of them are delivering bit rates of network/local programming that don't include bit rate reductions caused by multicasting of subchannels? If stations aren't using separate encoders for this, different than their OTA encoders, it seems much (or all) of the blocking artifacts and PQ reductions (resolution-wise) seen from DBS or cable would be the stations fault. Additional on-the-fly rate shaping with requantization at cable/DBS head ends might be a factor, too. -- John
Originally Posted by Mike99 /forum/post/17005823
About 2 yrs ago & spoke to the VP of engineering for our PBS station. He said Comcast did not add any compression to the station's signal. That whatever the station sends out is what Comcast sends out. The discussion was really about another topic so I never asked how the signal got to Comcast. But is was interesting to hear that Comcast did not add any compression.
Originally Posted by texasbrit /forum/post/17009937
That was true then but it certainly isn't true now.
Comcast nationally used to put two HD channels into each QAM channel but now allocates three channels per QAM channel.
Originally Posted by AntAltMike /forum/post/17010327
Federal Communications Commission
Washington, D.C. 20554
In the Matter of:
-Implementation of the Satellite Home Viewer Improvement Act of 1999
-Broadcast Signal Carriage Issues CS Docket No. 00-96
-Retransmission Consent Issues CS Docket No. 99-363
Originally Posted by Ken H /forum/post/17010083
Sure it is, for local HD channels, which are still 2 per QAM, meaning no additional compression.
Correct, national HD channels are 3 per QAM.