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December 21st, 2013, 06:39 PM | #1 |
Regular Crew
Join Date: Mar 2013
Location: Arkansas City, Kansas
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Color bar / Test pattern question
Hello All,
I was watching a live sporting event on a local television channel today. The broadcast had ended and had faded to black for about a minute. Then there was color bars on screen with tone for about 30 seconds, until a set of commercials played, and a new program started. What was different from what i was used to about the color bars was that there was a small white box overlaid on top of the color bars bouncing from top to bottom every one second or so. Then overlaid atop everything was the normal character ID. Does anyone know what the bouncing white box is? what is it called? and what is it's purpose? Nothing major, just curious. I have never seen this before. Thanks!! Merry Christmas!! |
December 21st, 2013, 08:25 PM | #2 | |
Inner Circle
Join Date: Jan 2006
Posts: 2,699
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Re: Color bar / Test pattern question
Quote:
By having movement of some sort within the frame, it stops the confusion. Signal goes away, freeze frame, and ball stops. A clue to be getting on the phone to whoever is sending the signal to you. |
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December 21st, 2013, 08:29 PM | #3 |
Regular Crew
Join Date: Mar 2013
Location: Arkansas City, Kansas
Posts: 27
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Re: Color bar / Test pattern question
Here is an example of what i saw:
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December 21st, 2013, 09:13 PM | #4 | |
Major Player
Join Date: Mar 2012
Location: Hamilton, New Zealand
Posts: 747
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Re: Color bar / Test pattern question
Quote:
I could guess.. maybe it's used to check the waveform and vector scopes are working as it shows movement? I'm probably wrong though :P |
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December 23rd, 2013, 06:12 PM | #5 |
Inner Circle
Join Date: Jan 2006
Posts: 2,699
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Re: Color bar / Test pattern question
Seeing the posted image, I'm pretty sure my answer is correct - as long as the box is moving, it's showing you're receiving a proper signal. If you see a stationary box, you've lost the signal and the decoder is just showing a freeze frame from the time it went away.
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