- published: 08 Feb 2008
- views: 125854
High-definition television (HDTV) provides a resolution that is substantially higher than that of standard-definition television.
HDTV may be transmitted in various varieties:
The letter "p" here stands for progressive scan while "i" indicates interlaced.
When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television).
The term high definition once described a series of television systems originating from the late 1930s; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution.
The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the (mechanical) Baird 240 line and (electronic) Marconi-EMI 405 line (377i) systems. The Baird system was discontinued in February 1937. In 1938 France followed with their own 441-line system, variants of which were also used by a number of other countries. The US NTSC system joined in 1941. In 1949 France introduced an even higher-resolution standard at 819 lines (768i), a system that would be high definition even by today's standards, but it was monochrome only. All of these systems used interlacing and a 4:3 aspect ratio except the 240-line system which was progressive (actually described at the time by the technically correct term "sequential") and the 405-line system which started as 5:4 and later changed to 4:3. The 405-line system adopted the (at that time) revolutionary idea of interlaced scanning to overcome the flicker problem of the 240-line with its 25 Hz frame rate. The 240-line system could have doubled its frame rate but this would have meant that the transmitted signal would have doubled in bandwidth, an unacceptable option.
Put your hands up in the sky and wave and wave [x2]
[come on and] 2 step
Keri talk
I’m startin the think I need space
Now everytime I go out you all in my face
Soon as I hit the door
Why you gotta be actin so insecure?
Where I been? Who I was with?
Boy, you stressin me out with this….watch this
Relationship is supposed to revolve around trust, right?
Well lets take it back a few months, like
What about the other chick, thought you was kicking it with
Man I’m getting sick of it
Damnit it’s a shame, a sin
You bout to get a dose of your medicine
You couldn’t even handle it, if the shoe was on the other foot now..
So what you gonna do when I don’t give you that last chance
And how you gonna act when you see me in the back with a new man
And what’s it gonna be when you could see me and him holding hands
I’ll bet you give a damn then
You can keep on feelin yourself
I’ma be wit somebody else
Better keep it real wit yourself
Or you’ll end up by yourself
[x2]
Now you’re threatening to leave me, so what
Ordinarily I would be biting my tongue but, naw
You couldn’t picture me gone, thought I’d be sittin at home while you was doin the wrong
You know it’s messing with my head
Thoughts of her up in my bed
And if I do what you did to me how would it be
If the shoe was on the other foot now…
I can wil’out take the knuckle route but I got class
So what you gonna do when I pimp it out brand new romance
When what you have turned into what you had
I’ll bet you give a damn then
You can keep on feelin yourself
I’ma be wit somebody else
Better keep it real wit yourself
Or you’ll end up by yourself
[x2]
Baby, do you know what I goo through
Sittin’ up waiting for you
If that was you, you’d be gone
Baby your sleepin’ on me..
You can keep on feelin yourself
I’ma be wit somebody else
Better keep it real wit yourself
Or you’ll end up by yourself
[x2]