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Guest Message by DevFuse

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Terrible PQ on NBCHD OTA

uhf

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6 replies to this topic

#1 OFFLINE   SPACEMAKER

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Posted 12 September 2010 - 10:03 AM

I have noticed lately that my local OTA NBCHD PQ is friggin' awful.

I am in the Lansing MI market and get NBC, Fox, CBS, ABC and PBS OTA as well. All 95%+ signal strength and all except NBC look fantastic.

So I am wondering if this is a national issue or a local affiliate issue.

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#2 OFFLINE   CCarncross

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Posted 15 September 2010 - 02:05 PM

I have noticed lately that my local OTA NBCHD PQ is friggin' awful.

I am in the Lansing MI market and get NBC, Fox, CBS, ABC and PBS OTA as well. All 95%+ signal strength and all except NBC look fantastic.

So I am wondering if this is a national issue or a local affiliate issue.


I am also in the Lansing DMA, but I have noticed other DMA's where NBC gets very pixellated with any fast motion, and I am referring to OTA as well so it might be a national NBC issue.

#3 OFFLINE   Jim5506

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Posted 15 September 2010 - 07:37 PM

Does your NBC station have any sub-channels?

If so, they may be squeezing the bandwidth for the HD channel to make room for the other(s), this causes macro blocking with major screen movement, especially with a 1080i broadcast.
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#4 OFFLINE   SPACEMAKER

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Posted 16 September 2010 - 09:45 AM

There is 1 sub-channel. However PBS (3 sub-channels) ABC (1 sub-channel) and FOX (1sub-channel) do not have this issue.

I watched part a of the UM-Notre Dame game last Saturday and the macro-blocking and PQ was terrible.

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#5 OFFLINE   bidger

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Posted 16 September 2010 - 10:13 AM

Does your NBC station have any sub-channels?


There is 1 sub-channel. However PBS (3 sub-channels) ABC (1 sub-channel) and FOX (1sub-channel) do not have this issue.

I watched part a of the UM-Notre Dame game last Saturday and the macro-blocking and PQ was terrible.


Thank you!

This sub-channel thing comes up any time someone mentions how awful NBC-HD is, especially for Sports. The local ABC has two sub-channels, but I see none of the issues there that I do with NBC, which has one sub-channel. It has nothing to do with it.

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#6 OFFLINE   Jim5506

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Posted 16 September 2010 - 06:48 PM

ABC and FOX are 720p, NBC is 1080i. A good 1080i picture requires nearly the whole 6 mhz spectrum allocated per channel, whereas 720p only requires about 85% of that bandwidth.

There is also a type of encoder that uses balancing to determine which channel "needs" the greater share of bandwidth on the fly while 2 or 3 or more channels are simultaneously broadcast.

Perhaps, your NBC station not only is robbing bandwidth from the 1080i stream but also has a cheap encoder.

You might look at Rabbitears.info and find your NBC station and see how the station allocates its bandwidth.

Edited by Jim5506, 16 September 2010 - 07:00 PM.

Tuners: Hopper 2000; Hopper w/Sling; 3 Joeys; Samsung SIR-T351; Accurian 6000;2 X HD TiVo; 2 X TiVo Series 2 Stand alone; Panasonic Showstopper 2000
Dish 1000.2 @ 110, 119, 129; dish 500 @ 61.5
Antennas - CM4228; RS U75-R; coathanger; Funke PSP.1922 (stillin the box); paperclip
Displays: Sony VPH D50Q with HD Fury HDMI input; Hitachi 57F59; Sony Bravia LCD;Sanyo 32" LCD; Panasonic 42" plasma
Sony 80GB PS3; Toshiba HD-DVD

Give me a Finco colinear array and I'll rule the world - HA-HA-HA-HA!

#7 OFFLINE   bidger

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Posted 17 September 2010 - 04:47 PM

ABC and FOX are 720p, NBC is 1080i. A good 1080i picture requires nearly the whole 6 mhz spectrum allocated per channel, whereas 720p only requires about 85% of that bandwidth.


Then why do I not see the anomalies on my local PBS, which is 1080i with 4 sub-channels, 2 video and 2 audio-only?

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