[LINK] Does NBN need a third satellite?

[Karl Auer]

On Sat, 2016-04-02 at 11:17 +1100, David Boxall wrote:
> On 1/04/2016 8:36 AM, Tom Worthington wrote:
> UHD has to be compressed for transmission.

Just a teeny fact injection here: We in the IT world tend to regard
compression as being lossless by default (zip, gzip, etc).[1]

What many in the IT world do not realise is that "compress" in the
video world BY DEFAULT means "throw data away until the remainder is
small enough". This is antithetical to the concept of high definition.

I'm prepared to be shown up here, but I am almost certain that
"compressed for transmission" means "has had much data discarded". What
you get to see, at the consumer end of the transmission, is a much
-damaged item.

Regards, K.

[1] An original item X is compressed; the result is a compressed
version Y. Lossless compression means that Y can be processed in such a
way as to produce an item that is bit-for-bit identical to X. Lossy
compression means that there is no way back to X.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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