[mythtv] [mythtv-commits] Ticket #3418: [13136] prevents seeing channels with duplicate callsigns

Bruce Markey bjm at lvcm.com
Tue May 8 18:27:35 UTC 2007

Daniel Kristjansson wrote:
> All I meant was that the transmission on a frequency can be a
> multiplex carrying more than one "channel of programming"; the

I think "channel of programming" or 'agreed upon carrier
frequency that may carry a television transmission' should be
the assumption when the word "channel" is used in relation to
TV channels. Confusion arises when "channel" is used to refer
to the content from a television broadcaster.

> frequency UHF 44 contains the set {5.1,5.2}, while the 5.1
> "channel" contains the set {5.1}, and {5.1} != {5.1,5.2}. The
> frequency UHF 44 is an "FCC channel", but corresponds to two
> "channel" rows in MythTV with different tuning information.
> Should I refer to 5.1 as a "sub-channel" rather than a channel
> to avoid confusion?

"Sub-channel" may clarify the N.1, N.2 when discussing HDTV
channels. However, 5.1 and 5.2 are each 'agreed upon carrier
frequency that may carry a television transmission'. These could
or should be referred to as TV channels because each may be
used by a piece of receiving equipment to tune to the content
from a transmitter.

The UHF 44 "channel" is a different use of the word meaning
something like 'the spectrum of frequencies that had previously
been reserved for NTSC broadcasts'. If I understand your example,
it is assumed that there is no NTSC broadcast allowed on channel 
44 in this market and instead two different "channels of programming"
for digital transmissions can now be found in the spectrum that had
been reserved for NTSC 44.

--  bjm

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