channel display vs. actual channel

[Guest]

Archived from groups: alt.tv.tech.hdtv (More info?)

Just curious what HDTVs or OTA set top boxes typically display for channel
numbers, and where those numbers come from if showing the related analog
channel number instead of the actual digital channel? I just found an FCC
list today showing the actual digital broadcast channels.

I have a Samsung SIR-T351 set top box which only receives digital
channels. What it displays for digital channel numbers mostly correspond
to the channel of the related analog counterpart rather than the actual
digital channel. For example what displays as digital channel 5-1 is
related to analog channel 5, but the digital is actually broadcast on
channel 29. If I punch either 05 or 29 into the remote, it goes to what
is displayed as channel 5-1.

The only ones that do not seem to correspond to their analog channels are
1-1 (analog 26, actual channel 27) and 1-2 (which might be analog 28).

Which brings up another question. There are 6 channels 38-1 through 38-6
(related to analog 38). Do they all broadcast on the same digital channel
43, or different actual channels?

--
David Efflandt - Elgin, IL

 

[Guest]

Archived from groups: alt.tv.tech.hdtv (More info?)

Most digital channels are re-mapped to match the analog channel number
this is to keep them friendly to you (no guess work).

When you see multiple suffixes for a single channel number they can be
different or the same my local ABC has 6-1, 6-2 and 6-3 which have
different info on each, another station local WB has 17-1 and 17-2 -1
has the HD feed and -2 has an SD feed.
I am sure you will find other situations for channels that broadcast
multiple signals.


--
rcbridge
------------------------------------------------------------------------
This message was posted via http/www.satelliteguys.us by rcbridge

 

[Guest]

Archived from groups: alt.tv.tech.hdtv (More info?)

> Which brings up another question. There are 6 channels 38-1 through 38-6
> (related to analog 38). Do they all broadcast on the same digital channel
> 43, or different actual channels?

The flexability of ATSC broadcasts, besides the increased quality of picture
and sound allow many options. The 6Mhz bandwidth of NTSC can be used by ATSC
to broadcast one true HD channel or one HD 720P and two digital SD or 4 SD
channels, or two HD channels (720p) or any combination of the above within
the alloted 6mhz bandwidth. In other words one NTSC channel or one ATSC
band of information (channel) is 6 mhz wide and is considered a channel.
This ATSC channel (band of frequencys) can be used to provide multiple
information "channels" whether it's sound, picture or computer information.
In your case they are all contained in the 6 mhz channel 43.

In addition to the above the digital channels stay within the 6mhz bandwidth
better than the old analog channels did. That means that channels can be
allotted in an area without skipping alternate channels. This means a
better use of the public airwaves. The FCC is downscaling our PUBLIC TV
freqencys from 2-82 to 2-50 by 2006.

 

[greywolf]

Archived from groups: alt.tv.tech.hdtv (More info?)

"David Efflandt" <efflandt@xnet.com> wrote in message
news:slrncn6uf0.gju.efflandt@typhoon.xnet.com...
> Just curious what HDTVs or OTA set top boxes typically display for channel
> numbers, and where those numbers come from if showing the related analog
> channel number instead of the actual digital channel? I just found an FCC
> list today showing the actual digital broadcast channels.
>
> I have a Samsung SIR-T351 set top box which only receives digital
> channels. What it displays for digital channel numbers mostly correspond
> to the channel of the related analog counterpart rather than the actual
> digital channel. For example what displays as digital channel 5-1 is
> related to analog channel 5, but the digital is actually broadcast on
> channel 29. If I punch either 05 or 29 into the remote, it goes to what
> is displayed as channel 5-1.
>
> The only ones that do not seem to correspond to their analog channels are
> 1-1 (analog 26, actual channel 27) and 1-2 (which might be analog 28).
>
> Which brings up another question. There are 6 channels 38-1 through 38-6
> (related to analog 38). Do they all broadcast on the same digital channel
> 43, or different actual channels?
>
> --
> David Efflandt - Elgin, IL

They are all carried on 43. A single carrier channel can handle 1 HD and one
SD full capability channel as well as one low bandwidth channel such as
weather radar. 7-1, 7-2 and 7-3 do exactly that setup. Up to 6 SD channels
is another option that PAX has chosen. WGN carries 9-1, 9-2, 75-1 and 75-2
on channel 19 and all are HD. That's possible because each mirrors exactly
the same picture information. The -2's are Spanish when available. The 75s
are duplicates because the WB wants people traveling to be able to tune
their programming on channel 75 anywhere they go in the country. The 1-1 and
1-2 are because of an improper setting on WCIUs PSIP generator which is the
device that controls the channel remap as well as program information for
the guide on many receivers.Their analog equivalents are 26 and 23. The FCC
is going to require proper PSIP use in the near future but does not right
now.

Pat