Digital Broadcasting is History

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Commonwealth Telecommunications Organisation

The document discusses digital broadcasting and compression techniques. It explains that digital broadcasting works as long as errors are corrected and data is compressed. Lossless compression can reinflate data to its original form, while lossy compression cannot be fully reinflated but retains some of the original shape, and concatenated lossy compression further reduces size but prevents full recovery of the original data.

DBSF Caribbean 2012 2
Digital broadcasting is
history
Everything takes time to get through the system

DBSF Caribbean 2012 3
Digital broadcasting doesn’t
work
The system is riddled with errors

DBSF Caribbean 2012 4
Digital broadcasting is too fat
It takes up more space than analogue

DBSF Caribbean 2012 5
Digital broadcasting is
brilliant as long as …
The errors are corrected
The data is compressed

DBSF Caribbean 2012 6
Digital errors are only ever …
A bit is missing
A 1 is mistaken for a 0
A 0 is mistaken for a 1

DBSF Caribbean 2012 7
Digital compression is either…
Lossless
or
Lossy

DBSF Caribbean 2012 8
To compress a balloon into a
smaller space, untie the neck and
let the air out.
Reinflate ( and tie up the neck ) to
get back the balloon as good as
new.
This is LOSSLESS compression

DBSF Caribbean 2012 9
To compress a balloon into a
smaller space, prick it with a pin.
Reinflation NOT possible but the
bits of balloon still look a little like
a balloon
This is LOSSY compression

DBSF Caribbean 2012 10
To AGAIN compress that balloon
into a smaller space, cut off the
shredded rubber.
Reinflation or repair NOT possible
but the wee bit of the balloon still
looks a little like a balloon
This is CONCATENATED LOSSY
compression

DBSF Caribbean 2012 11
Digital broadcasting is
brilliant as long as …
The errors are corrected
The data is compressed

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Digital Broadcasting is History

1. DBSF Caribbean 2012 1 Digits

2. DBSF Caribbean 2012 2 Digital broadcasting is history Everything takes time to get through the system

3. DBSF Caribbean 2012 3 Digital broadcasting doesn’t work The system is riddled with errors

4. DBSF Caribbean 2012 4 Digital broadcasting is too fat It takes up more space than analogue

5. DBSF Caribbean 2012 5 Digital broadcasting is brilliant as long as … The errors are corrected The data is compressed

6. DBSF Caribbean 2012 6 Digital errors are only ever … A bit is missing A 1 is mistaken for a 0 A 0 is mistaken for a 1

7. DBSF Caribbean 2012 7 Digital compression is either… Lossless or Lossy

8. DBSF Caribbean 2012 8 To compress a balloon into a smaller space, untie the neck and let the air out. Reinflate ( and tie up the neck ) to get back the balloon as good as new. This is LOSSLESS compression

9. DBSF Caribbean 2012 9 To compress a balloon into a smaller space, prick it with a pin. Reinflation NOT possible but the bits of balloon still look a little like a balloon This is LOSSY compression

10. DBSF Caribbean 2012 10 To AGAIN compress that balloon into a smaller space, cut off the shredded rubber. Reinflation or repair NOT possible but the wee bit of the balloon still looks a little like a balloon This is CONCATENATED LOSSY compression

11. DBSF Caribbean 2012 11 Digital broadcasting is brilliant as long as … The errors are corrected The data is compressed

12. DBSF Caribbean 2012 12 Digits

Digital Broadcasting is History

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