When did 480i resolution begin in broadcast television

[ezcapper]

When did broadcast television begin using the 480i resolution the same resolution as today's sd tv broadcasts?

[johns0]

Google it.

[ezcapper]

I did and couldn't find the answer

[pandy]

I did and couldn't find the answer

BT.601 and BT.656 times...

[ndjamena]

What do you mean by begin?

They must have transmitted something at some point during the development phase, which I doubt anyone documented.


Officially 1st July 1941 (I think).

Some high level testing began on April 30 1939 though.

As far as I can tell anyway...

[pandy]

What do you mean by begin?

They must have transmitted something at some point during the development phase, which I doubt anyone documented.


Officially 1st July 1941 (I think).

Some high level testing began on April 30 1939 though.

As far as I can tell anyway...

Nope - 480 active lines are for digital video, for analog video it was AFAIR 486i

[aedipuss]

it wasn't 486 either ntsc analog tv is 525 lines

[ndjamena]

Stop being picky, do you really think that's what the OP means?

-edit- wikipedia described it as 525 lines AND I IGNORED IT, BECAUSE IT WASN'T IMPORTANT.

[aedipuss]

LOL - educating the youngsters properly is important. even trivial facts are facts. should we go on and tell him it took 2 passes of the electron gun to complete a line? so the visible resolution should have been 262.5 lines, but some of that was lost in the overscan area? and that's how digital ended up at 240 lines/480i?

[pandy]

it wasn't 486 either ntsc analog tv is 525 lines

well... first i've wrote about active video lines and second bot 480i and 486i system have 525 video lines... so not sure what are you asking for...

LOL - educating the youngsters properly is important. even trivial facts are facts. should we go on and tell him it took 2 passes of the electron gun to complete a line? so the visible resolution should have been 262.5 lines, but some of that was lost in the overscan area? and that's how digital ended up at 240 lines/480i?

yes, i agree, education is important and as such not sure how i can help you as seem you are confused with problem

[newpball]

yes, i agree, education is important and as such not sure how i can help you as seem you are confused with problem

He indeed seems to be confused about the electron scanning.

And in general knowing history is obviously important, how else can we learn from mistakes we made in the past!

[ndjamena]

Your idea of what constitutes a mistake is rather naïve.

Apparently they were supposed to wait until 4K monitors became possible and affordable before attempting to develop a television system and then they were supposed to make the inner workings flexible enough (ie excessively complicated enough) to let anyone feed in anything they liked with impunity and expect a perfect result at the other end.

[usually_quiet]

I don't recall seeing the term "480i" used before digital TV transmissions began in the USA. That would be some time in the 1990s for digital cable and the first over-the-air tests. In the analog TV era, the term used for the equivalent analog resolution was "NTSC".

[newpball]

Your idea of what constitutes a mistake is rather naïve.

Apparently they were supposed to wait until 4K monitors became possible and affordable before attempting to develop a television system and then they were supposed to make the inner workings flexible enough (ie excessively complicated enough) to let anyone feed in anything they liked with impunity and expect a perfect result at the other end.

The development of NTSC in 1940 was not a mistake, it was a great achievement!

However that this 75 year old system is still prevalent in 2015 is not just a mistake it is a travesty of technological advancement.

[lingyi]

When did broadcast television begin using the 480i resolution the same resolution as today's sd tv broadcasts?

For broadcast: June 12, 2009 for the U.S. with the switch from NTSC (analog) to ATSC (digital). 480i (720x480 and 640x480) are part of the broadcast standard. https://en.wikipedia.org/wiki/Advanced_Television_Systems_Committee_standard

[ndjamena]

Japan also uses 480i

https://en.wikipedia.org/wiki/ISDB

Japan started digital broadcasting using the DVB-S standard by PerfecTV in October/1996, and DirecTV in December/1997, with communication satellites.

I'm fairly certain 2009 was when the Analogue channels began to be shut off and not when digital first began broadcasting.

[ndjamena]

Here we go

https://en.wikipedia.org/wiki/Digital_television_transition

Sometime in 1998 for the US.

And this would be why SD resolutions are still being used even today:
https://en.wikipedia.org/wiki/Digital_television

However, broadcasters may choose to reduce these resolutions to save bandwidth (e.g., many DVB-T channels in the United Kingdom use a horizontal resolution of 544 or 704 pixels per line).

https://en.wikipedia.org/wiki/Channel_capacity

I would have preferred if they'd made a more concerted effort to abolish DVD once Blu Ray had been firmly established, it's continuing dominance is hurting both optical formats. However, it's never really that simple and would require a separate SD Blu Ray standard.

[newpball]

I would have preferred if they'd made a more concerted effort to abolish DVD once Blu Ray had been firmly established, it's continuing dominance is hurting both optical formats.

What?!

[ndjamena]

Digital Satellite "Broadcasting" began in the US in 1994.

https://en.wikipedia.org/wiki/Digital_Satellite_Service

https://en.wikipedia.org/wiki/Direct-broadcast_satellite

Like I said, what's the scope of this question?


-edit- and I just realised "What do you mean by begin?" makes half the posts in this thread redundant.